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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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package java.awt;
import java.io.
PrintStream;
import java.io.
PrintWriter;
import java.util.
Objects;
import java.util.
Vector;
import java.util.
Locale;
import java.util.
EventListener;
import java.util.
HashSet;
import java.util.
Map;
import java.util.
Set;
import java.util.
Collections;
import java.awt.peer.
ComponentPeer;
import java.awt.peer.
ContainerPeer;
import java.awt.peer.
LightweightPeer;
import java.awt.image.
BufferStrategy;
import java.awt.image.
ImageObserver;
import java.awt.image.
ImageProducer;
import java.awt.image.
ColorModel;
import java.awt.image.
VolatileImage;
import java.awt.event.*;
import java.io.
Serializable;
import java.io.
ObjectOutputStream;
import java.io.
ObjectInputStream;
import java.io.
IOException;
import java.beans.
PropertyChangeListener;
import java.beans.
PropertyChangeSupport;
import java.beans.
Transient;
import java.awt.im.
InputContext;
import java.awt.im.
InputMethodRequests;
import java.awt.dnd.
DropTarget;
import java.lang.reflect.
InvocationTargetException;
import java.lang.reflect.
Method;
import java.security.
AccessController;
import java.security.
PrivilegedAction;
import java.security.
AccessControlContext;
import javax.accessibility.*;
import java.applet.
Applet;
import sun.security.action.
GetPropertyAction;
import sun.awt.
AppContext;
import sun.awt.
AWTAccessor;
import sun.awt.
ConstrainableGraphics;
import sun.awt.
SubRegionShowable;
import sun.awt.
SunToolkit;
import sun.awt.
WindowClosingListener;
import sun.awt.
CausedFocusEvent;
import sun.awt.
EmbeddedFrame;
import sun.awt.dnd.
SunDropTargetEvent;
import sun.awt.im.
CompositionArea;
import sun.font.
FontManager;
import sun.font.
FontManagerFactory;
import sun.font.
SunFontManager;
import sun.java2d.
SunGraphics2D;
import sun.java2d.pipe.
Region;
import sun.awt.image.
VSyncedBSManager;
import sun.java2d.pipe.hw.
ExtendedBufferCapabilities;
import static sun.java2d.pipe.hw.
ExtendedBufferCapabilities.
VSyncType.*;
import sun.awt.
RequestFocusController;
import sun.java2d.
SunGraphicsEnvironment;
import sun.util.logging.
PlatformLogger;
/**
* A <em>component</em> is an object having a graphical representation
* that can be displayed on the screen and that can interact with the
* user. Examples of components are the buttons, checkboxes, and scrollbars
* of a typical graphical user interface. <p>
* The <code>Component</code> class is the abstract superclass of
* the nonmenu-related Abstract Window Toolkit components. Class
* <code>Component</code> can also be extended directly to create a
* lightweight component. A lightweight component is a component that is
* not associated with a native window. On the contrary, a heavyweight
* component is associated with a native window. The {@link #isLightweight()}
* method may be used to distinguish between the two kinds of the components.
* <p>
* Lightweight and heavyweight components may be mixed in a single component
* hierarchy. However, for correct operating of such a mixed hierarchy of
* components, the whole hierarchy must be valid. When the hierarchy gets
* invalidated, like after changing the bounds of components, or
* adding/removing components to/from containers, the whole hierarchy must be
* validated afterwards by means of the {@link Container#validate()} method
* invoked on the top-most invalid container of the hierarchy.
*
* <h3>Serialization</h3>
* It is important to note that only AWT listeners which conform
* to the <code>Serializable</code> protocol will be saved when
* the object is stored. If an AWT object has listeners that
* aren't marked serializable, they will be dropped at
* <code>writeObject</code> time. Developers will need, as always,
* to consider the implications of making an object serializable.
* One situation to watch out for is this:
* <pre>
* import java.awt.*;
* import java.awt.event.*;
* import java.io.Serializable;
*
* class MyApp implements ActionListener, Serializable
* {
* BigObjectThatShouldNotBeSerializedWithAButton bigOne;
* Button aButton = new Button();
*
* MyApp()
* {
* // Oops, now aButton has a listener with a reference
* // to bigOne!
* aButton.addActionListener(this);
* }
*
* public void actionPerformed(ActionEvent e)
* {
* System.out.println("Hello There");
* }
* }
* </pre>
* In this example, serializing <code>aButton</code> by itself
* will cause <code>MyApp</code> and everything it refers to
* to be serialized as well. The problem is that the listener
* is serializable by coincidence, not by design. To separate
* the decisions about <code>MyApp</code> and the
* <code>ActionListener</code> being serializable one can use a
* nested class, as in the following example:
* <pre>
* import java.awt.*;
* import java.awt.event.*;
* import java.io.Serializable;
*
* class MyApp implements java.io.Serializable
* {
* BigObjectThatShouldNotBeSerializedWithAButton bigOne;
* Button aButton = new Button();
*
* static class MyActionListener implements ActionListener
* {
* public void actionPerformed(ActionEvent e)
* {
* System.out.println("Hello There");
* }
* }
*
* MyApp()
* {
* aButton.addActionListener(new MyActionListener());
* }
* }
* </pre>
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
* <p>
* For details on the focus subsystem, see
* <a href="https://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
* How to Use the Focus Subsystem</a>,
* a section in <em>The Java Tutorial</em>, and the
* <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
* for more information.
*
* @author Arthur van Hoff
* @author Sami Shaio
*/
public abstract class
Component implements
ImageObserver,
MenuContainer,
Serializable
{
private static final
PlatformLogger log =
PlatformLogger.
getLogger("java.awt.Component");
private static final
PlatformLogger eventLog =
PlatformLogger.
getLogger("java.awt.event.Component");
private static final
PlatformLogger focusLog =
PlatformLogger.
getLogger("java.awt.focus.Component");
private static final
PlatformLogger mixingLog =
PlatformLogger.
getLogger("java.awt.mixing.Component");
/**
* The peer of the component. The peer implements the component's
* behavior. The peer is set when the <code>Component</code> is
* added to a container that also is a peer.
* @see #addNotify
* @see #removeNotify
*/
transient
ComponentPeer peer;
/**
* The parent of the object. It may be <code>null</code>
* for top-level components.
* @see #getParent
*/
transient
Container parent;
/**
* The <code>AppContext</code> of the component. Applets/Plugin may
* change the AppContext.
*/
transient
AppContext appContext;
/**
* The x position of the component in the parent's coordinate system.
*
* @serial
* @see #getLocation
*/
int
x;
/**
* The y position of the component in the parent's coordinate system.
*
* @serial
* @see #getLocation
*/
int
y;
/**
* The width of the component.
*
* @serial
* @see #getSize
*/
int
width;
/**
* The height of the component.
*
* @serial
* @see #getSize
*/
int
height;
/**
* The foreground color for this component.
* <code>foreground</code> can be <code>null</code>.
*
* @serial
* @see #getForeground
* @see #setForeground
*/
Color foreground;
/**
* The background color for this component.
* <code>background</code> can be <code>null</code>.
*
* @serial
* @see #getBackground
* @see #setBackground
*/
Color background;
/**
* The font used by this component.
* The <code>font</code> can be <code>null</code>.
*
* @serial
* @see #getFont
* @see #setFont
*/
volatile
Font font;
/**
* The font which the peer is currently using.
* (<code>null</code> if no peer exists.)
*/
Font peerFont;
/**
* The cursor displayed when pointer is over this component.
* This value can be <code>null</code>.
*
* @serial
* @see #getCursor
* @see #setCursor
*/
Cursor cursor;
/**
* The locale for the component.
*
* @serial
* @see #getLocale
* @see #setLocale
*/
Locale locale;
/**
* A reference to a <code>GraphicsConfiguration</code> object
* used to describe the characteristics of a graphics
* destination.
* This value can be <code>null</code>.
*
* @since 1.3
* @serial
* @see GraphicsConfiguration
* @see #getGraphicsConfiguration
*/
private transient volatile
GraphicsConfiguration graphicsConfig;
/**
* A reference to a <code>BufferStrategy</code> object
* used to manipulate the buffers on this component.
*
* @since 1.4
* @see java.awt.image.BufferStrategy
* @see #getBufferStrategy()
*/
transient
BufferStrategy bufferStrategy = null;
/**
* True when the object should ignore all repaint events.
*
* @since 1.4
* @serial
* @see #setIgnoreRepaint
* @see #getIgnoreRepaint
*/
boolean
ignoreRepaint = false;
/**
* True when the object is visible. An object that is not
* visible is not drawn on the screen.
*
* @serial
* @see #isVisible
* @see #setVisible
*/
boolean
visible = true;
/**
* True when the object is enabled. An object that is not
* enabled does not interact with the user.
*
* @serial
* @see #isEnabled
* @see #setEnabled
*/
boolean
enabled = true;
/**
* True when the object is valid. An invalid object needs to
* be layed out. This flag is set to false when the object
* size is changed.
*
* @serial
* @see #isValid
* @see #validate
* @see #invalidate
*/
private volatile boolean
valid = false;
/**
* The <code>DropTarget</code> associated with this component.
*
* @since 1.2
* @serial
* @see #setDropTarget
* @see #getDropTarget
*/
DropTarget dropTarget;
/**
* @serial
* @see #add
*/
Vector<
PopupMenu>
popups;
/**
* A component's name.
* This field can be <code>null</code>.
*
* @serial
* @see #getName
* @see #setName(String)
*/
private
String name;
/**
* A bool to determine whether the name has
* been set explicitly. <code>nameExplicitlySet</code> will
* be false if the name has not been set and
* true if it has.
*
* @serial
* @see #getName
* @see #setName(String)
*/
private boolean
nameExplicitlySet = false;
/**
* Indicates whether this Component can be focused.
*
* @serial
* @see #setFocusable
* @see #isFocusable
* @since 1.4
*/
private boolean
focusable = true;
private static final int
FOCUS_TRAVERSABLE_UNKNOWN = 0;
private static final int
FOCUS_TRAVERSABLE_DEFAULT = 1;
private static final int
FOCUS_TRAVERSABLE_SET = 2;
/**
* Tracks whether this Component is relying on default focus travesability.
*
* @serial
* @since 1.4
*/
private int
isFocusTraversableOverridden =
FOCUS_TRAVERSABLE_UNKNOWN;
/**
* The focus traversal keys. These keys will generate focus traversal
* behavior for Components for which focus traversal keys are enabled. If a
* value of null is specified for a traversal key, this Component inherits
* that traversal key from its parent. If all ancestors of this Component
* have null specified for that traversal key, then the current
* KeyboardFocusManager's default traversal key is used.
*
* @serial
* @see #setFocusTraversalKeys
* @see #getFocusTraversalKeys
* @since 1.4
*/
Set<
AWTKeyStroke>[]
focusTraversalKeys;
private static final
String[]
focusTraversalKeyPropertyNames = {
"forwardFocusTraversalKeys",
"backwardFocusTraversalKeys",
"upCycleFocusTraversalKeys",
"downCycleFocusTraversalKeys"
};
/**
* Indicates whether focus traversal keys are enabled for this Component.
* Components for which focus traversal keys are disabled receive key
* events for focus traversal keys. Components for which focus traversal
* keys are enabled do not see these events; instead, the events are
* automatically converted to traversal operations.
*
* @serial
* @see #setFocusTraversalKeysEnabled
* @see #getFocusTraversalKeysEnabled
* @since 1.4
*/
private boolean
focusTraversalKeysEnabled = true;
/**
* The locking object for AWT component-tree and layout operations.
*
* @see #getTreeLock
*/
static final
Object LOCK = new
AWTTreeLock();
static class
AWTTreeLock {}
/*
* The component's AccessControlContext.
*/
private transient volatile
AccessControlContext acc =
AccessController.
getContext();
/**
* Minimum size.
* (This field perhaps should have been transient).
*
* @serial
*/
Dimension minSize;
/**
* Whether or not setMinimumSize has been invoked with a non-null value.
*/
boolean
minSizeSet;
/**
* Preferred size.
* (This field perhaps should have been transient).
*
* @serial
*/
Dimension prefSize;
/**
* Whether or not setPreferredSize has been invoked with a non-null value.
*/
boolean
prefSizeSet;
/**
* Maximum size
*
* @serial
*/
Dimension maxSize;
/**
* Whether or not setMaximumSize has been invoked with a non-null value.
*/
boolean
maxSizeSet;
/**
* The orientation for this component.
* @see #getComponentOrientation
* @see #setComponentOrientation
*/
transient
ComponentOrientation componentOrientation
=
ComponentOrientation.
UNKNOWN;
/**
* <code>newEventsOnly</code> will be true if the event is
* one of the event types enabled for the component.
* It will then allow for normal processing to
* continue. If it is false the event is passed
* to the component's parent and up the ancestor
* tree until the event has been consumed.
*
* @serial
* @see #dispatchEvent
*/
boolean
newEventsOnly = false;
transient
ComponentListener componentListener;
transient
FocusListener focusListener;
transient
HierarchyListener hierarchyListener;
transient
HierarchyBoundsListener hierarchyBoundsListener;
transient
KeyListener keyListener;
transient
MouseListener mouseListener;
transient
MouseMotionListener mouseMotionListener;
transient
MouseWheelListener mouseWheelListener;
transient
InputMethodListener inputMethodListener;
transient
RuntimeException windowClosingException = null;
/** Internal, constants for serialization */
final static
String actionListenerK = "actionL";
final static
String adjustmentListenerK = "adjustmentL";
final static
String componentListenerK = "componentL";
final static
String containerListenerK = "containerL";
final static
String focusListenerK = "focusL";
final static
String itemListenerK = "itemL";
final static
String keyListenerK = "keyL";
final static
String mouseListenerK = "mouseL";
final static
String mouseMotionListenerK = "mouseMotionL";
final static
String mouseWheelListenerK = "mouseWheelL";
final static
String textListenerK = "textL";
final static
String ownedWindowK = "ownedL";
final static
String windowListenerK = "windowL";
final static
String inputMethodListenerK = "inputMethodL";
final static
String hierarchyListenerK = "hierarchyL";
final static
String hierarchyBoundsListenerK = "hierarchyBoundsL";
final static
String windowStateListenerK = "windowStateL";
final static
String windowFocusListenerK = "windowFocusL";
/**
* The <code>eventMask</code> is ONLY set by subclasses via
* <code>enableEvents</code>.
* The mask should NOT be set when listeners are registered
* so that we can distinguish the difference between when
* listeners request events and subclasses request them.
* One bit is used to indicate whether input methods are
* enabled; this bit is set by <code>enableInputMethods</code> and is
* on by default.
*
* @serial
* @see #enableInputMethods
* @see AWTEvent
*/
long
eventMask =
AWTEvent.
INPUT_METHODS_ENABLED_MASK;
/**
* Static properties for incremental drawing.
* @see #imageUpdate
*/
static boolean
isInc;
static int
incRate;
static {
/* ensure that the necessary native libraries are loaded */
Toolkit.
loadLibraries();
/* initialize JNI field and method ids */
if (!
GraphicsEnvironment.
isHeadless()) {
initIDs();
}
String s = java.security.
AccessController.
doPrivileged(
new
GetPropertyAction("awt.image.incrementaldraw"));
isInc = (
s == null ||
s.
equals("true"));
s = java.security.
AccessController.
doPrivileged(
new
GetPropertyAction("awt.image.redrawrate"));
incRate = (
s != null) ?
Integer.
parseInt(
s) : 100;
}
/**
* Ease-of-use constant for <code>getAlignmentY()</code>.
* Specifies an alignment to the top of the component.
* @see #getAlignmentY
*/
public static final float
TOP_ALIGNMENT = 0.0f;
/**
* Ease-of-use constant for <code>getAlignmentY</code> and
* <code>getAlignmentX</code>. Specifies an alignment to
* the center of the component
* @see #getAlignmentX
* @see #getAlignmentY
*/
public static final float
CENTER_ALIGNMENT = 0.5f;
/**
* Ease-of-use constant for <code>getAlignmentY</code>.
* Specifies an alignment to the bottom of the component.
* @see #getAlignmentY
*/
public static final float
BOTTOM_ALIGNMENT = 1.0f;
/**
* Ease-of-use constant for <code>getAlignmentX</code>.
* Specifies an alignment to the left side of the component.
* @see #getAlignmentX
*/
public static final float
LEFT_ALIGNMENT = 0.0f;
/**
* Ease-of-use constant for <code>getAlignmentX</code>.
* Specifies an alignment to the right side of the component.
* @see #getAlignmentX
*/
public static final float
RIGHT_ALIGNMENT = 1.0f;
/*
* JDK 1.1 serialVersionUID
*/
private static final long
serialVersionUID = -7644114512714619750L;
/**
* If any <code>PropertyChangeListeners</code> have been registered,
* the <code>changeSupport</code> field describes them.
*
* @serial
* @since 1.2
* @see #addPropertyChangeListener
* @see #removePropertyChangeListener
* @see #firePropertyChange
*/
private
PropertyChangeSupport changeSupport;
/*
* In some cases using "this" as an object to synchronize by
* can lead to a deadlock if client code also uses synchronization
* by a component object. For every such situation revealed we should
* consider possibility of replacing "this" with the package private
* objectLock object introduced below. So far there're 3 issues known:
* - CR 6708322 (the getName/setName methods);
* - CR 6608764 (the PropertyChangeListener machinery);
* - CR 7108598 (the Container.paint/KeyboardFocusManager.clearMostRecentFocusOwner methods).
*
* Note: this field is considered final, though readObject() prohibits
* initializing final fields.
*/
private transient
Object objectLock = new
Object();
Object getObjectLock() {
return
objectLock;
}
/*
* Returns the acc this component was constructed with.
*/
final
AccessControlContext getAccessControlContext() {
if (
acc == null) {
throw new
SecurityException("Component is missing AccessControlContext");
}
return
acc;
}
boolean
isPacked = false;
/**
* Pseudoparameter for direct Geometry API (setLocation, setBounds setSize
* to signal setBounds what's changing. Should be used under TreeLock.
* This is only needed due to the inability to change the cross-calling
* order of public and deprecated methods.
*/
private int
boundsOp =
ComponentPeer.
DEFAULT_OPERATION;
/**
* Enumeration of the common ways the baseline of a component can
* change as the size changes. The baseline resize behavior is
* primarily for layout managers that need to know how the
* position of the baseline changes as the component size changes.
* In general the baseline resize behavior will be valid for sizes
* greater than or equal to the minimum size (the actual minimum
* size; not a developer specified minimum size). For sizes
* smaller than the minimum size the baseline may change in a way
* other than the baseline resize behavior indicates. Similarly,
* as the size approaches <code>Integer.MAX_VALUE</code> and/or
* <code>Short.MAX_VALUE</code> the baseline may change in a way
* other than the baseline resize behavior indicates.
*
* @see #getBaselineResizeBehavior
* @see #getBaseline(int,int)
* @since 1.6
*/
public enum
BaselineResizeBehavior {
/**
* Indicates the baseline remains fixed relative to the
* y-origin. That is, <code>getBaseline</code> returns
* the same value regardless of the height or width. For example, a
* <code>JLabel</code> containing non-empty text with a
* vertical alignment of <code>TOP</code> should have a
* baseline type of <code>CONSTANT_ASCENT</code>.
*/
CONSTANT_ASCENT,
/**
* Indicates the baseline remains fixed relative to the height
* and does not change as the width is varied. That is, for
* any height H the difference between H and
* <code>getBaseline(w, H)</code> is the same. For example, a
* <code>JLabel</code> containing non-empty text with a
* vertical alignment of <code>BOTTOM</code> should have a
* baseline type of <code>CONSTANT_DESCENT</code>.
*/
CONSTANT_DESCENT,
/**
* Indicates the baseline remains a fixed distance from
* the center of the component. That is, for any height H the
* difference between <code>getBaseline(w, H)</code> and
* <code>H / 2</code> is the same (plus or minus one depending upon
* rounding error).
* <p>
* Because of possible rounding errors it is recommended
* you ask for the baseline with two consecutive heights and use
* the return value to determine if you need to pad calculations
* by 1. The following shows how to calculate the baseline for
* any height:
* <pre>
* Dimension preferredSize = component.getPreferredSize();
* int baseline = getBaseline(preferredSize.width,
* preferredSize.height);
* int nextBaseline = getBaseline(preferredSize.width,
* preferredSize.height + 1);
* // Amount to add to height when calculating where baseline
* // lands for a particular height:
* int padding = 0;
* // Where the baseline is relative to the mid point
* int baselineOffset = baseline - height / 2;
* if (preferredSize.height % 2 == 0 &&
* baseline != nextBaseline) {
* padding = 1;
* }
* else if (preferredSize.height % 2 == 1 &&
* baseline == nextBaseline) {
* baselineOffset--;
* padding = 1;
* }
* // The following calculates where the baseline lands for
* // the height z:
* int calculatedBaseline = (z + padding) / 2 + baselineOffset;
* </pre>
*/
CENTER_OFFSET,
/**
* Indicates the baseline resize behavior can not be expressed using
* any of the other constants. This may also indicate the baseline
* varies with the width of the component. This is also returned
* by components that do not have a baseline.
*/
OTHER
}
/*
* The shape set with the applyCompoundShape() method. It uncludes the result
* of the HW/LW mixing related shape computation. It may also include
* the user-specified shape of the component.
* The 'null' value means the component has normal shape (or has no shape at all)
* and applyCompoundShape() will skip the following shape identical to normal.
*/
private transient
Region compoundShape = null;
/*
* Represents the shape of this lightweight component to be cut out from
* heavyweight components should they intersect. Possible values:
* 1. null - consider the shape rectangular
* 2. EMPTY_REGION - nothing gets cut out (children still get cut out)
* 3. non-empty - this shape gets cut out.
*/
private transient
Region mixingCutoutRegion = null;
/*
* Indicates whether addNotify() is complete
* (i.e. the peer is created).
*/
private transient boolean
isAddNotifyComplete = false;
/**
* Should only be used in subclass getBounds to check that part of bounds
* is actualy changing
*/
int
getBoundsOp() {
assert
Thread.
holdsLock(
getTreeLock());
return
boundsOp;
}
void
setBoundsOp(int
op) {
assert
Thread.
holdsLock(
getTreeLock());
if (
op ==
ComponentPeer.
RESET_OPERATION) {
boundsOp =
ComponentPeer.
DEFAULT_OPERATION;
} else
if (
boundsOp ==
ComponentPeer.
DEFAULT_OPERATION) {
boundsOp =
op;
}
}
// Whether this Component has had the background erase flag
// specified via SunToolkit.disableBackgroundErase(). This is
// needed in order to make this function work on X11 platforms,
// where currently there is no chance to interpose on the creation
// of the peer and therefore the call to XSetBackground.
transient boolean
backgroundEraseDisabled;
static {
AWTAccessor.
setComponentAccessor(new
AWTAccessor.
ComponentAccessor() {
public void
setBackgroundEraseDisabled(
Component comp, boolean
disabled) {
comp.
backgroundEraseDisabled =
disabled;
}
public boolean
getBackgroundEraseDisabled(
Component comp) {
return
comp.
backgroundEraseDisabled;
}
public
Rectangle getBounds(
Component comp) {
return new
Rectangle(
comp.
x,
comp.
y,
comp.
width,
comp.
height);
}
public void
setMixingCutoutShape(
Component comp,
Shape shape) {
Region region =
shape == null ? null :
Region.
getInstance(
shape, null);
synchronized (
comp.
getTreeLock()) {
boolean
needShowing = false;
boolean
needHiding = false;
if (!
comp.
isNonOpaqueForMixing()) {
needHiding = true;
}
comp.
mixingCutoutRegion =
region;
if (!
comp.
isNonOpaqueForMixing()) {
needShowing = true;
}
if (
comp.
isMixingNeeded()) {
if (
needHiding) {
comp.
mixOnHiding(
comp.
isLightweight());
}
if (
needShowing) {
comp.
mixOnShowing();
}
}
}
}
public void
setGraphicsConfiguration(
Component comp,
GraphicsConfiguration gc)
{
comp.
setGraphicsConfiguration(
gc);
}
public boolean
requestFocus(
Component comp,
CausedFocusEvent.
Cause cause) {
return
comp.
requestFocus(
cause);
}
public boolean
canBeFocusOwner(
Component comp) {
return
comp.
canBeFocusOwner();
}
public boolean
isVisible(
Component comp) {
return
comp.
isVisible_NoClientCode();
}
public void
setRequestFocusController
(
RequestFocusController requestController)
{
Component.
setRequestFocusController(
requestController);
}
public
AppContext getAppContext(
Component comp) {
return
comp.
appContext;
}
public void
setAppContext(
Component comp,
AppContext appContext) {
comp.
appContext =
appContext;
}
public
Container getParent(
Component comp) {
return
comp.
getParent_NoClientCode();
}
public void
setParent(
Component comp,
Container parent) {
comp.
parent =
parent;
}
public void
setSize(
Component comp, int
width, int
height) {
comp.
width =
width;
comp.
height =
height;
}
public
Point getLocation(
Component comp) {
return
comp.
location_NoClientCode();
}
public void
setLocation(
Component comp, int
x, int
y) {
comp.
x =
x;
comp.
y =
y;
}
public boolean
isEnabled(
Component comp) {
return
comp.
isEnabledImpl();
}
public boolean
isDisplayable(
Component comp) {
return
comp.
peer != null;
}
public
Cursor getCursor(
Component comp) {
return
comp.
getCursor_NoClientCode();
}
public
ComponentPeer getPeer(
Component comp) {
return
comp.
peer;
}
public void
setPeer(
Component comp,
ComponentPeer peer) {
comp.
peer =
peer;
}
public boolean
isLightweight(
Component comp) {
return (
comp.
peer instanceof
LightweightPeer);
}
public boolean
getIgnoreRepaint(
Component comp) {
return
comp.
ignoreRepaint;
}
public int
getWidth(
Component comp) {
return
comp.
width;
}
public int
getHeight(
Component comp) {
return
comp.
height;
}
public int
getX(
Component comp) {
return
comp.
x;
}
public int
getY(
Component comp) {
return
comp.
y;
}
public
Color getForeground(
Component comp) {
return
comp.
foreground;
}
public
Color getBackground(
Component comp) {
return
comp.
background;
}
public void
setBackground(
Component comp,
Color background) {
comp.
background =
background;
}
public
Font getFont(
Component comp) {
return
comp.
getFont_NoClientCode();
}
public void
processEvent(
Component comp,
AWTEvent e) {
comp.
processEvent(
e);
}
public
AccessControlContext getAccessControlContext(
Component comp) {
return
comp.
getAccessControlContext();
}
public void
revalidateSynchronously(
Component comp) {
comp.
revalidateSynchronously();
}
});
}
/**
* Constructs a new component. Class <code>Component</code> can be
* extended directly to create a lightweight component that does not
* utilize an opaque native window. A lightweight component must be
* hosted by a native container somewhere higher up in the component
* tree (for example, by a <code>Frame</code> object).
*/
protected
Component() {
appContext =
AppContext.
getAppContext();
}
@
SuppressWarnings({"rawtypes", "unchecked"})
void
initializeFocusTraversalKeys() {
focusTraversalKeys = new
Set[3];
}
/**
* Constructs a name for this component. Called by <code>getName</code>
* when the name is <code>null</code>.
*/
String constructComponentName() {
return null; // For strict compliance with prior platform versions, a Component
// that doesn't set its name should return null from
// getName()
}
/**
* Gets the name of the component.
* @return this component's name
* @see #setName
* @since JDK1.1
*/
public
String getName() {
if (
name == null && !
nameExplicitlySet) {
synchronized(
getObjectLock()) {
if (
name == null && !
nameExplicitlySet)
name =
constructComponentName();
}
}
return
name;
}
/**
* Sets the name of the component to the specified string.
* @param name the string that is to be this
* component's name
* @see #getName
* @since JDK1.1
*/
public void
setName(
String name) {
String oldName;
synchronized(
getObjectLock()) {
oldName = this.
name;
this.
name =
name;
nameExplicitlySet = true;
}
firePropertyChange("name",
oldName,
name);
}
/**
* Gets the parent of this component.
* @return the parent container of this component
* @since JDK1.0
*/
public
Container getParent() {
return
getParent_NoClientCode();
}
// NOTE: This method may be called by privileged threads.
// This functionality is implemented in a package-private method
// to insure that it cannot be overridden by client subclasses.
// DO NOT INVOKE CLIENT CODE ON THIS THREAD!
final
Container getParent_NoClientCode() {
return
parent;
}
// This method is overridden in the Window class to return null,
// because the parent field of the Window object contains
// the owner of the window, not its parent.
Container getContainer() {
return
getParent_NoClientCode();
}
/**
* @deprecated As of JDK version 1.1,
* programs should not directly manipulate peers;
* replaced by <code>boolean isDisplayable()</code>.
*/
@
Deprecated
public
ComponentPeer getPeer() {
return
peer;
}
/**
* Associate a <code>DropTarget</code> with this component.
* The <code>Component</code> will receive drops only if it
* is enabled.
*
* @see #isEnabled
* @param dt The DropTarget
*/
public synchronized void
setDropTarget(
DropTarget dt) {
if (
dt ==
dropTarget || (
dropTarget != null &&
dropTarget.
equals(
dt)))
return;
DropTarget old;
if ((
old =
dropTarget) != null) {
if (
peer != null)
dropTarget.
removeNotify(
peer);
DropTarget t =
dropTarget;
dropTarget = null;
try {
t.
setComponent(null);
} catch (
IllegalArgumentException iae) {
// ignore it.
}
}
// if we have a new one, and we have a peer, add it!
if ((
dropTarget =
dt) != null) {
try {
dropTarget.
setComponent(this);
if (
peer != null)
dropTarget.
addNotify(
peer);
} catch (
IllegalArgumentException iae) {
if (
old != null) {
try {
old.
setComponent(this);
if (
peer != null)
dropTarget.
addNotify(
peer);
} catch (
IllegalArgumentException iae1) {
// ignore it!
}
}
}
}
}
/**
* Gets the <code>DropTarget</code> associated with this
* <code>Component</code>.
*/
public synchronized
DropTarget getDropTarget() { return
dropTarget; }
/**
* Gets the <code>GraphicsConfiguration</code> associated with this
* <code>Component</code>.
* If the <code>Component</code> has not been assigned a specific
* <code>GraphicsConfiguration</code>,
* the <code>GraphicsConfiguration</code> of the
* <code>Component</code> object's top-level container is
* returned.
* If the <code>Component</code> has been created, but not yet added
* to a <code>Container</code>, this method returns <code>null</code>.
*
* @return the <code>GraphicsConfiguration</code> used by this
* <code>Component</code> or <code>null</code>
* @since 1.3
*/
public
GraphicsConfiguration getGraphicsConfiguration() {
return
getGraphicsConfiguration_NoClientCode();
}
final
GraphicsConfiguration getGraphicsConfiguration_NoClientCode() {
return
graphicsConfig;
}
void
setGraphicsConfiguration(
GraphicsConfiguration gc) {
synchronized(
getTreeLock()) {
if (
updateGraphicsData(
gc)) {
removeNotify();
addNotify();
}
}
}
boolean
updateGraphicsData(
GraphicsConfiguration gc) {
checkTreeLock();
if (
graphicsConfig ==
gc) {
return false;
}
graphicsConfig =
gc;
ComponentPeer peer =
getPeer();
if (
peer != null) {
return
peer.
updateGraphicsData(
gc);
}
return false;
}
/**
* Checks that this component's <code>GraphicsDevice</code>
* <code>idString</code> matches the string argument.
*/
void
checkGD(
String stringID) {
if (
graphicsConfig != null) {
if (!
graphicsConfig.
getDevice().
getIDstring().
equals(
stringID)) {
throw new
IllegalArgumentException(
"adding a container to a container on a different GraphicsDevice");
}
}
}
/**
* Gets this component's locking object (the object that owns the thread
* synchronization monitor) for AWT component-tree and layout
* operations.
* @return this component's locking object
*/
public final
Object getTreeLock() {
return
LOCK;
}
final void
checkTreeLock() {
if (!
Thread.
holdsLock(
getTreeLock())) {
throw new
IllegalStateException("This function should be called while holding treeLock");
}
}
/**
* Gets the toolkit of this component. Note that
* the frame that contains a component controls which
* toolkit is used by that component. Therefore if the component
* is moved from one frame to another, the toolkit it uses may change.
* @return the toolkit of this component
* @since JDK1.0
*/
public
Toolkit getToolkit() {
return
getToolkitImpl();
}
/*
* This is called by the native code, so client code can't
* be called on the toolkit thread.
*/
final
Toolkit getToolkitImpl() {
Container parent = this.
parent;
if (
parent != null) {
return
parent.
getToolkitImpl();
}
return
Toolkit.
getDefaultToolkit();
}
/**
* Determines whether this component is valid. A component is valid
* when it is correctly sized and positioned within its parent
* container and all its children are also valid.
* In order to account for peers' size requirements, components are invalidated
* before they are first shown on the screen. By the time the parent container
* is fully realized, all its components will be valid.
* @return <code>true</code> if the component is valid, <code>false</code>
* otherwise
* @see #validate
* @see #invalidate
* @since JDK1.0
*/
public boolean
isValid() {
return (
peer != null) &&
valid;
}
/**
* Determines whether this component is displayable. A component is
* displayable when it is connected to a native screen resource.
* <p>
* A component is made displayable either when it is added to
* a displayable containment hierarchy or when its containment
* hierarchy is made displayable.
* A containment hierarchy is made displayable when its ancestor
* window is either packed or made visible.
* <p>
* A component is made undisplayable either when it is removed from
* a displayable containment hierarchy or when its containment hierarchy
* is made undisplayable. A containment hierarchy is made
* undisplayable when its ancestor window is disposed.
*
* @return <code>true</code> if the component is displayable,
* <code>false</code> otherwise
* @see Container#add(Component)
* @see Window#pack
* @see Window#show
* @see Container#remove(Component)
* @see Window#dispose
* @since 1.2
*/
public boolean
isDisplayable() {
return
getPeer() != null;
}
/**
* Determines whether this component should be visible when its
* parent is visible. Components are
* initially visible, with the exception of top level components such
* as <code>Frame</code> objects.
* @return <code>true</code> if the component is visible,
* <code>false</code> otherwise
* @see #setVisible
* @since JDK1.0
*/
@
Transient
public boolean
isVisible() {
return
isVisible_NoClientCode();
}
final boolean
isVisible_NoClientCode() {
return
visible;
}
/**
* Determines whether this component will be displayed on the screen.
* @return <code>true</code> if the component and all of its ancestors
* until a toplevel window or null parent are visible,
* <code>false</code> otherwise
*/
boolean
isRecursivelyVisible() {
return
visible && (
parent == null ||
parent.
isRecursivelyVisible());
}
/**
* Determines the bounds of a visible part of the component relative to its
* parent.
*
* @return the visible part of bounds
*/
private
Rectangle getRecursivelyVisibleBounds() {
final
Component container =
getContainer();
final
Rectangle bounds =
getBounds();
if (
container == null) {
// we are top level window or haven't a container, return our bounds
return
bounds;
}
// translate the container's bounds to our coordinate space
final
Rectangle parentsBounds =
container.
getRecursivelyVisibleBounds();
parentsBounds.
setLocation(0, 0);
return
parentsBounds.
intersection(
bounds);
}
/**
* Translates absolute coordinates into coordinates in the coordinate
* space of this component.
*/
Point pointRelativeToComponent(
Point absolute) {
Point compCoords =
getLocationOnScreen();
return new
Point(
absolute.
x -
compCoords.
x,
absolute.
y -
compCoords.
y);
}
/**
* Assuming that mouse location is stored in PointerInfo passed
* to this method, it finds a Component that is in the same
* Window as this Component and is located under the mouse pointer.
* If no such Component exists, null is returned.
* NOTE: this method should be called under the protection of
* tree lock, as it is done in Component.getMousePosition() and
* Container.getMousePosition(boolean).
*/
Component findUnderMouseInWindow(
PointerInfo pi) {
if (!
isShowing()) {
return null;
}
Window win =
getContainingWindow();
if (!
Toolkit.
getDefaultToolkit().
getMouseInfoPeer().
isWindowUnderMouse(
win)) {
return null;
}
final boolean
INCLUDE_DISABLED = true;
Point relativeToWindow =
win.
pointRelativeToComponent(
pi.
getLocation());
Component inTheSameWindow =
win.
findComponentAt(
relativeToWindow.
x,
relativeToWindow.
y,
INCLUDE_DISABLED);
return
inTheSameWindow;
}
/**
* Returns the position of the mouse pointer in this <code>Component</code>'s
* coordinate space if the <code>Component</code> is directly under the mouse
* pointer, otherwise returns <code>null</code>.
* If the <code>Component</code> is not showing on the screen, this method
* returns <code>null</code> even if the mouse pointer is above the area
* where the <code>Component</code> would be displayed.
* If the <code>Component</code> is partially or fully obscured by other
* <code>Component</code>s or native windows, this method returns a non-null
* value only if the mouse pointer is located above the unobscured part of the
* <code>Component</code>.
* <p>
* For <code>Container</code>s it returns a non-null value if the mouse is
* above the <code>Container</code> itself or above any of its descendants.
* Use {@link Container#getMousePosition(boolean)} if you need to exclude children.
* <p>
* Sometimes the exact mouse coordinates are not important, and the only thing
* that matters is whether a specific <code>Component</code> is under the mouse
* pointer. If the return value of this method is <code>null</code>, mouse
* pointer is not directly above the <code>Component</code>.
*
* @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
* @see #isShowing
* @see Container#getMousePosition
* @return mouse coordinates relative to this <code>Component</code>, or null
* @since 1.5
*/
public
Point getMousePosition() throws
HeadlessException {
if (
GraphicsEnvironment.
isHeadless()) {
throw new
HeadlessException();
}
PointerInfo pi = java.security.
AccessController.
doPrivileged(
new java.security.
PrivilegedAction<
PointerInfo>() {
public
PointerInfo run() {
return
MouseInfo.
getPointerInfo();
}
}
);
synchronized (
getTreeLock()) {
Component inTheSameWindow =
findUnderMouseInWindow(
pi);
if (!
isSameOrAncestorOf(
inTheSameWindow, true)) {
return null;
}
return
pointRelativeToComponent(
pi.
getLocation());
}
}
/**
* Overridden in Container. Must be called under TreeLock.
*/
boolean
isSameOrAncestorOf(
Component comp, boolean
allowChildren) {
return
comp == this;
}
/**
* Determines whether this component is showing on screen. This means
* that the component must be visible, and it must be in a container
* that is visible and showing.
* <p>
* <strong>Note:</strong> sometimes there is no way to detect whether the
* {@code Component} is actually visible to the user. This can happen when:
* <ul>
* <li>the component has been added to a visible {@code ScrollPane} but
* the {@code Component} is not currently in the scroll pane's view port.
* <li>the {@code Component} is obscured by another {@code Component} or
* {@code Container}.
* </ul>
* @return <code>true</code> if the component is showing,
* <code>false</code> otherwise
* @see #setVisible
* @since JDK1.0
*/
public boolean
isShowing() {
if (
visible && (
peer != null)) {
Container parent = this.
parent;
return (
parent == null) ||
parent.
isShowing();
}
return false;
}
/**
* Determines whether this component is enabled. An enabled component
* can respond to user input and generate events. Components are
* enabled initially by default. A component may be enabled or disabled by
* calling its <code>setEnabled</code> method.
* @return <code>true</code> if the component is enabled,
* <code>false</code> otherwise
* @see #setEnabled
* @since JDK1.0
*/
public boolean
isEnabled() {
return
isEnabledImpl();
}
/*
* This is called by the native code, so client code can't
* be called on the toolkit thread.
*/
final boolean
isEnabledImpl() {
return
enabled;
}
/**
* Enables or disables this component, depending on the value of the
* parameter <code>b</code>. An enabled component can respond to user
* input and generate events. Components are enabled initially by default.
*
* <p>Note: Disabling a lightweight component does not prevent it from
* receiving MouseEvents.
* <p>Note: Disabling a heavyweight container prevents all components
* in this container from receiving any input events. But disabling a
* lightweight container affects only this container.
*
* @param b If <code>true</code>, this component is
* enabled; otherwise this component is disabled
* @see #isEnabled
* @see #isLightweight
* @since JDK1.1
*/
public void
setEnabled(boolean
b) {
enable(
b);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setEnabled(boolean)</code>.
*/
@
Deprecated
public void
enable() {
if (!
enabled) {
synchronized (
getTreeLock()) {
enabled = true;
ComponentPeer peer = this.
peer;
if (
peer != null) {
peer.
setEnabled(true);
if (
visible && !
getRecursivelyVisibleBounds().
isEmpty()) {
updateCursorImmediately();
}
}
}
if (
accessibleContext != null) {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
null,
AccessibleState.
ENABLED);
}
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setEnabled(boolean)</code>.
*/
@
Deprecated
public void
enable(boolean
b) {
if (
b) {
enable();
} else {
disable();
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setEnabled(boolean)</code>.
*/
@
Deprecated
public void
disable() {
if (
enabled) {
KeyboardFocusManager.
clearMostRecentFocusOwner(this);
synchronized (
getTreeLock()) {
enabled = false;
// A disabled lw container is allowed to contain a focus owner.
if ((
isFocusOwner() || (
containsFocus() && !
isLightweight())) &&
KeyboardFocusManager.
isAutoFocusTransferEnabled())
{
// Don't clear the global focus owner. If transferFocus
// fails, we want the focus to stay on the disabled
// Component so that keyboard traversal, et. al. still
// makes sense to the user.
transferFocus(false);
}
ComponentPeer peer = this.
peer;
if (
peer != null) {
peer.
setEnabled(false);
if (
visible && !
getRecursivelyVisibleBounds().
isEmpty()) {
updateCursorImmediately();
}
}
}
if (
accessibleContext != null) {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
null,
AccessibleState.
ENABLED);
}
}
}
/**
* Returns true if this component is painted to an offscreen image
* ("buffer") that's copied to the screen later. Component
* subclasses that support double buffering should override this
* method to return true if double buffering is enabled.
*
* @return false by default
*/
public boolean
isDoubleBuffered() {
return false;
}
/**
* Enables or disables input method support for this component. If input
* method support is enabled and the component also processes key events,
* incoming events are offered to
* the current input method and will only be processed by the component or
* dispatched to its listeners if the input method does not consume them.
* By default, input method support is enabled.
*
* @param enable true to enable, false to disable
* @see #processKeyEvent
* @since 1.2
*/
public void
enableInputMethods(boolean
enable) {
if (
enable) {
if ((
eventMask &
AWTEvent.
INPUT_METHODS_ENABLED_MASK) != 0)
return;
// If this component already has focus, then activate the
// input method by dispatching a synthesized focus gained
// event.
if (
isFocusOwner()) {
InputContext inputContext =
getInputContext();
if (
inputContext != null) {
FocusEvent focusGainedEvent =
new
FocusEvent(this,
FocusEvent.
FOCUS_GAINED);
inputContext.
dispatchEvent(
focusGainedEvent);
}
}
eventMask |=
AWTEvent.
INPUT_METHODS_ENABLED_MASK;
} else {
if ((
eventMask &
AWTEvent.
INPUT_METHODS_ENABLED_MASK) != 0) {
InputContext inputContext =
getInputContext();
if (
inputContext != null) {
inputContext.
endComposition();
inputContext.
removeNotify(this);
}
}
eventMask &= ~
AWTEvent.
INPUT_METHODS_ENABLED_MASK;
}
}
/**
* Shows or hides this component depending on the value of parameter
* <code>b</code>.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param b if <code>true</code>, shows this component;
* otherwise, hides this component
* @see #isVisible
* @see #invalidate
* @since JDK1.1
*/
public void
setVisible(boolean
b) {
show(
b);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setVisible(boolean)</code>.
*/
@
Deprecated
public void
show() {
if (!
visible) {
synchronized (
getTreeLock()) {
visible = true;
mixOnShowing();
ComponentPeer peer = this.
peer;
if (
peer != null) {
peer.
setVisible(true);
createHierarchyEvents(
HierarchyEvent.
HIERARCHY_CHANGED,
this,
parent,
HierarchyEvent.
SHOWING_CHANGED,
Toolkit.
enabledOnToolkit(
AWTEvent.
HIERARCHY_EVENT_MASK));
if (
peer instanceof
LightweightPeer) {
repaint();
}
updateCursorImmediately();
}
if (
componentListener != null ||
(
eventMask &
AWTEvent.
COMPONENT_EVENT_MASK) != 0 ||
Toolkit.
enabledOnToolkit(
AWTEvent.
COMPONENT_EVENT_MASK)) {
ComponentEvent e = new
ComponentEvent(this,
ComponentEvent.
COMPONENT_SHOWN);
Toolkit.
getEventQueue().
postEvent(
e);
}
}
Container parent = this.
parent;
if (
parent != null) {
parent.
invalidate();
}
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setVisible(boolean)</code>.
*/
@
Deprecated
public void
show(boolean
b) {
if (
b) {
show();
} else {
hide();
}
}
boolean
containsFocus() {
return
isFocusOwner();
}
void
clearMostRecentFocusOwnerOnHide() {
KeyboardFocusManager.
clearMostRecentFocusOwner(this);
}
void
clearCurrentFocusCycleRootOnHide() {
/* do nothing */
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setVisible(boolean)</code>.
*/
@
Deprecated
public void
hide() {
isPacked = false;
if (
visible) {
clearCurrentFocusCycleRootOnHide();
clearMostRecentFocusOwnerOnHide();
synchronized (
getTreeLock()) {
visible = false;
mixOnHiding(
isLightweight());
if (
containsFocus() &&
KeyboardFocusManager.
isAutoFocusTransferEnabled()) {
transferFocus(true);
}
ComponentPeer peer = this.
peer;
if (
peer != null) {
peer.
setVisible(false);
createHierarchyEvents(
HierarchyEvent.
HIERARCHY_CHANGED,
this,
parent,
HierarchyEvent.
SHOWING_CHANGED,
Toolkit.
enabledOnToolkit(
AWTEvent.
HIERARCHY_EVENT_MASK));
if (
peer instanceof
LightweightPeer) {
repaint();
}
updateCursorImmediately();
}
if (
componentListener != null ||
(
eventMask &
AWTEvent.
COMPONENT_EVENT_MASK) != 0 ||
Toolkit.
enabledOnToolkit(
AWTEvent.
COMPONENT_EVENT_MASK)) {
ComponentEvent e = new
ComponentEvent(this,
ComponentEvent.
COMPONENT_HIDDEN);
Toolkit.
getEventQueue().
postEvent(
e);
}
}
Container parent = this.
parent;
if (
parent != null) {
parent.
invalidate();
}
}
}
/**
* Gets the foreground color of this component.
* @return this component's foreground color; if this component does
* not have a foreground color, the foreground color of its parent
* is returned
* @see #setForeground
* @since JDK1.0
* @beaninfo
* bound: true
*/
@
Transient
public
Color getForeground() {
Color foreground = this.
foreground;
if (
foreground != null) {
return
foreground;
}
Container parent = this.
parent;
return (
parent != null) ?
parent.
getForeground() : null;
}
/**
* Sets the foreground color of this component.
* @param c the color to become this component's
* foreground color; if this parameter is <code>null</code>
* then this component will inherit
* the foreground color of its parent
* @see #getForeground
* @since JDK1.0
*/
public void
setForeground(
Color c) {
Color oldColor =
foreground;
ComponentPeer peer = this.
peer;
foreground =
c;
if (
peer != null) {
c =
getForeground();
if (
c != null) {
peer.
setForeground(
c);
}
}
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("foreground",
oldColor,
c);
}
/**
* Returns whether the foreground color has been explicitly set for this
* Component. If this method returns <code>false</code>, this Component is
* inheriting its foreground color from an ancestor.
*
* @return <code>true</code> if the foreground color has been explicitly
* set for this Component; <code>false</code> otherwise.
* @since 1.4
*/
public boolean
isForegroundSet() {
return (
foreground != null);
}
/**
* Gets the background color of this component.
* @return this component's background color; if this component does
* not have a background color,
* the background color of its parent is returned
* @see #setBackground
* @since JDK1.0
*/
@
Transient
public
Color getBackground() {
Color background = this.
background;
if (
background != null) {
return
background;
}
Container parent = this.
parent;
return (
parent != null) ?
parent.
getBackground() : null;
}
/**
* Sets the background color of this component.
* <p>
* The background color affects each component differently and the
* parts of the component that are affected by the background color
* may differ between operating systems.
*
* @param c the color to become this component's color;
* if this parameter is <code>null</code>, then this
* component will inherit the background color of its parent
* @see #getBackground
* @since JDK1.0
* @beaninfo
* bound: true
*/
public void
setBackground(
Color c) {
Color oldColor =
background;
ComponentPeer peer = this.
peer;
background =
c;
if (
peer != null) {
c =
getBackground();
if (
c != null) {
peer.
setBackground(
c);
}
}
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("background",
oldColor,
c);
}
/**
* Returns whether the background color has been explicitly set for this
* Component. If this method returns <code>false</code>, this Component is
* inheriting its background color from an ancestor.
*
* @return <code>true</code> if the background color has been explicitly
* set for this Component; <code>false</code> otherwise.
* @since 1.4
*/
public boolean
isBackgroundSet() {
return (
background != null);
}
/**
* Gets the font of this component.
* @return this component's font; if a font has not been set
* for this component, the font of its parent is returned
* @see #setFont
* @since JDK1.0
*/
@
Transient
public
Font getFont() {
return
getFont_NoClientCode();
}
// NOTE: This method may be called by privileged threads.
// This functionality is implemented in a package-private method
// to insure that it cannot be overridden by client subclasses.
// DO NOT INVOKE CLIENT CODE ON THIS THREAD!
final
Font getFont_NoClientCode() {
Font font = this.
font;
if (
font != null) {
return
font;
}
Container parent = this.
parent;
return (
parent != null) ?
parent.
getFont_NoClientCode() : null;
}
/**
* Sets the font of this component.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param f the font to become this component's font;
* if this parameter is <code>null</code> then this
* component will inherit the font of its parent
* @see #getFont
* @see #invalidate
* @since JDK1.0
* @beaninfo
* bound: true
*/
public void
setFont(
Font f) {
Font oldFont,
newFont;
synchronized(
getTreeLock()) {
oldFont =
font;
newFont =
font =
f;
ComponentPeer peer = this.
peer;
if (
peer != null) {
f =
getFont();
if (
f != null) {
peer.
setFont(
f);
peerFont =
f;
}
}
}
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("font",
oldFont,
newFont);
// This could change the preferred size of the Component.
// Fix for 6213660. Should compare old and new fonts and do not
// call invalidate() if they are equal.
if (
f !=
oldFont && (
oldFont == null ||
!
oldFont.
equals(
f))) {
invalidateIfValid();
}
}
/**
* Returns whether the font has been explicitly set for this Component. If
* this method returns <code>false</code>, this Component is inheriting its
* font from an ancestor.
*
* @return <code>true</code> if the font has been explicitly set for this
* Component; <code>false</code> otherwise.
* @since 1.4
*/
public boolean
isFontSet() {
return (
font != null);
}
/**
* Gets the locale of this component.
* @return this component's locale; if this component does not
* have a locale, the locale of its parent is returned
* @see #setLocale
* @exception IllegalComponentStateException if the <code>Component</code>
* does not have its own locale and has not yet been added to
* a containment hierarchy such that the locale can be determined
* from the containing parent
* @since JDK1.1
*/
public
Locale getLocale() {
Locale locale = this.
locale;
if (
locale != null) {
return
locale;
}
Container parent = this.
parent;
if (
parent == null) {
throw new
IllegalComponentStateException("This component must have a parent in order to determine its locale");
} else {
return
parent.
getLocale();
}
}
/**
* Sets the locale of this component. This is a bound property.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param l the locale to become this component's locale
* @see #getLocale
* @see #invalidate
* @since JDK1.1
*/
public void
setLocale(
Locale l) {
Locale oldValue =
locale;
locale =
l;
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("locale",
oldValue,
l);
// This could change the preferred size of the Component.
invalidateIfValid();
}
/**
* Gets the instance of <code>ColorModel</code> used to display
* the component on the output device.
* @return the color model used by this component
* @see java.awt.image.ColorModel
* @see java.awt.peer.ComponentPeer#getColorModel()
* @see Toolkit#getColorModel()
* @since JDK1.0
*/
public
ColorModel getColorModel() {
ComponentPeer peer = this.
peer;
if ((
peer != null) && ! (
peer instanceof
LightweightPeer)) {
return
peer.
getColorModel();
} else if (
GraphicsEnvironment.
isHeadless()) {
return
ColorModel.
getRGBdefault();
} // else
return
getToolkit().
getColorModel();
}
/**
* Gets the location of this component in the form of a
* point specifying the component's top-left corner.
* The location will be relative to the parent's coordinate space.
* <p>
* Due to the asynchronous nature of native event handling, this
* method can return outdated values (for instance, after several calls
* of <code>setLocation()</code> in rapid succession). For this
* reason, the recommended method of obtaining a component's position is
* within <code>java.awt.event.ComponentListener.componentMoved()</code>,
* which is called after the operating system has finished moving the
* component.
* </p>
* @return an instance of <code>Point</code> representing
* the top-left corner of the component's bounds in
* the coordinate space of the component's parent
* @see #setLocation
* @see #getLocationOnScreen
* @since JDK1.1
*/
public
Point getLocation() {
return
location();
}
/**
* Gets the location of this component in the form of a point
* specifying the component's top-left corner in the screen's
* coordinate space.
* @return an instance of <code>Point</code> representing
* the top-left corner of the component's bounds in the
* coordinate space of the screen
* @throws IllegalComponentStateException if the
* component is not showing on the screen
* @see #setLocation
* @see #getLocation
*/
public
Point getLocationOnScreen() {
synchronized (
getTreeLock()) {
return
getLocationOnScreen_NoTreeLock();
}
}
/*
* a package private version of getLocationOnScreen
* used by GlobalCursormanager to update cursor
*/
final
Point getLocationOnScreen_NoTreeLock() {
if (
peer != null &&
isShowing()) {
if (
peer instanceof
LightweightPeer) {
// lightweight component location needs to be translated
// relative to a native component.
Container host =
getNativeContainer();
Point pt =
host.
peer.
getLocationOnScreen();
for(
Component c = this;
c !=
host;
c =
c.
getParent()) {
pt.
x +=
c.
x;
pt.
y +=
c.
y;
}
return
pt;
} else {
Point pt =
peer.
getLocationOnScreen();
return
pt;
}
} else {
throw new
IllegalComponentStateException("component must be showing on the screen to determine its location");
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getLocation()</code>.
*/
@
Deprecated
public
Point location() {
return
location_NoClientCode();
}
private
Point location_NoClientCode() {
return new
Point(
x,
y);
}
/**
* Moves this component to a new location. The top-left corner of
* the new location is specified by the <code>x</code> and <code>y</code>
* parameters in the coordinate space of this component's parent.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param x the <i>x</i>-coordinate of the new location's
* top-left corner in the parent's coordinate space
* @param y the <i>y</i>-coordinate of the new location's
* top-left corner in the parent's coordinate space
* @see #getLocation
* @see #setBounds
* @see #invalidate
* @since JDK1.1
*/
public void
setLocation(int
x, int
y) {
move(
x,
y);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setLocation(int, int)</code>.
*/
@
Deprecated
public void
move(int
x, int
y) {
synchronized(
getTreeLock()) {
setBoundsOp(
ComponentPeer.
SET_LOCATION);
setBounds(
x,
y,
width,
height);
}
}
/**
* Moves this component to a new location. The top-left corner of
* the new location is specified by point <code>p</code>. Point
* <code>p</code> is given in the parent's coordinate space.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param p the point defining the top-left corner
* of the new location, given in the coordinate space of this
* component's parent
* @see #getLocation
* @see #setBounds
* @see #invalidate
* @since JDK1.1
*/
public void
setLocation(
Point p) {
setLocation(
p.
x,
p.
y);
}
/**
* Returns the size of this component in the form of a
* <code>Dimension</code> object. The <code>height</code>
* field of the <code>Dimension</code> object contains
* this component's height, and the <code>width</code>
* field of the <code>Dimension</code> object contains
* this component's width.
* @return a <code>Dimension</code> object that indicates the
* size of this component
* @see #setSize
* @since JDK1.1
*/
public
Dimension getSize() {
return
size();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getSize()</code>.
*/
@
Deprecated
public
Dimension size() {
return new
Dimension(
width,
height);
}
/**
* Resizes this component so that it has width <code>width</code>
* and height <code>height</code>.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param width the new width of this component in pixels
* @param height the new height of this component in pixels
* @see #getSize
* @see #setBounds
* @see #invalidate
* @since JDK1.1
*/
public void
setSize(int
width, int
height) {
resize(
width,
height);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setSize(int, int)</code>.
*/
@
Deprecated
public void
resize(int
width, int
height) {
synchronized(
getTreeLock()) {
setBoundsOp(
ComponentPeer.
SET_SIZE);
setBounds(
x,
y,
width,
height);
}
}
/**
* Resizes this component so that it has width <code>d.width</code>
* and height <code>d.height</code>.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param d the dimension specifying the new size
* of this component
* @throws NullPointerException if {@code d} is {@code null}
* @see #setSize
* @see #setBounds
* @see #invalidate
* @since JDK1.1
*/
public void
setSize(
Dimension d) {
resize(
d);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setSize(Dimension)</code>.
*/
@
Deprecated
public void
resize(
Dimension d) {
setSize(
d.
width,
d.
height);
}
/**
* Gets the bounds of this component in the form of a
* <code>Rectangle</code> object. The bounds specify this
* component's width, height, and location relative to
* its parent.
* @return a rectangle indicating this component's bounds
* @see #setBounds
* @see #getLocation
* @see #getSize
*/
public
Rectangle getBounds() {
return
bounds();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getBounds()</code>.
*/
@
Deprecated
public
Rectangle bounds() {
return new
Rectangle(
x,
y,
width,
height);
}
/**
* Moves and resizes this component. The new location of the top-left
* corner is specified by <code>x</code> and <code>y</code>, and the
* new size is specified by <code>width</code> and <code>height</code>.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param x the new <i>x</i>-coordinate of this component
* @param y the new <i>y</i>-coordinate of this component
* @param width the new <code>width</code> of this component
* @param height the new <code>height</code> of this
* component
* @see #getBounds
* @see #setLocation(int, int)
* @see #setLocation(Point)
* @see #setSize(int, int)
* @see #setSize(Dimension)
* @see #invalidate
* @since JDK1.1
*/
public void
setBounds(int
x, int
y, int
width, int
height) {
reshape(
x,
y,
width,
height);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>setBounds(int, int, int, int)</code>.
*/
@
Deprecated
public void
reshape(int
x, int
y, int
width, int
height) {
synchronized (
getTreeLock()) {
try {
setBoundsOp(
ComponentPeer.
SET_BOUNDS);
boolean
resized = (this.
width !=
width) || (this.
height !=
height);
boolean
moved = (this.
x !=
x) || (this.
y !=
y);
if (!
resized && !
moved) {
return;
}
int
oldX = this.
x;
int
oldY = this.
y;
int
oldWidth = this.
width;
int
oldHeight = this.
height;
this.
x =
x;
this.
y =
y;
this.
width =
width;
this.
height =
height;
if (
resized) {
isPacked = false;
}
boolean
needNotify = true;
mixOnReshaping();
if (
peer != null) {
// LightwightPeer is an empty stub so can skip peer.reshape
if (!(
peer instanceof
LightweightPeer)) {
reshapeNativePeer(
x,
y,
width,
height,
getBoundsOp());
// Check peer actualy changed coordinates
resized = (
oldWidth != this.
width) || (
oldHeight != this.
height);
moved = (
oldX != this.
x) || (
oldY != this.
y);
// fix for 5025858: do not send ComponentEvents for toplevel
// windows here as it is done from peer or native code when
// the window is really resized or moved, otherwise some
// events may be sent twice
if (this instanceof
Window) {
needNotify = false;
}
}
if (
resized) {
invalidate();
}
if (
parent != null) {
parent.
invalidateIfValid();
}
}
if (
needNotify) {
notifyNewBounds(
resized,
moved);
}
repaintParentIfNeeded(
oldX,
oldY,
oldWidth,
oldHeight);
} finally {
setBoundsOp(
ComponentPeer.
RESET_OPERATION);
}
}
}
private void
repaintParentIfNeeded(int
oldX, int
oldY, int
oldWidth,
int
oldHeight)
{
if (
parent != null &&
peer instanceof
LightweightPeer &&
isShowing()) {
// Have the parent redraw the area this component occupied.
parent.
repaint(
oldX,
oldY,
oldWidth,
oldHeight);
// Have the parent redraw the area this component *now* occupies.
repaint();
}
}
private void
reshapeNativePeer(int
x, int
y, int
width, int
height, int
op) {
// native peer might be offset by more than direct
// parent since parent might be lightweight.
int
nativeX =
x;
int
nativeY =
y;
for (
Component c =
parent;
(
c != null) && (
c.
peer instanceof
LightweightPeer);
c =
c.
parent)
{
nativeX +=
c.
x;
nativeY +=
c.
y;
}
peer.
setBounds(
nativeX,
nativeY,
width,
height,
op);
}
@
SuppressWarnings("deprecation")
private void
notifyNewBounds(boolean
resized, boolean
moved) {
if (
componentListener != null
|| (
eventMask &
AWTEvent.
COMPONENT_EVENT_MASK) != 0
||
Toolkit.
enabledOnToolkit(
AWTEvent.
COMPONENT_EVENT_MASK))
{
if (
resized) {
ComponentEvent e = new
ComponentEvent(this,
ComponentEvent.
COMPONENT_RESIZED);
Toolkit.
getEventQueue().
postEvent(
e);
}
if (
moved) {
ComponentEvent e = new
ComponentEvent(this,
ComponentEvent.
COMPONENT_MOVED);
Toolkit.
getEventQueue().
postEvent(
e);
}
} else {
if (this instanceof
Container && ((
Container)this).
countComponents() > 0) {
boolean
enabledOnToolkit =
Toolkit.
enabledOnToolkit(
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK);
if (
resized) {
((
Container)this).
createChildHierarchyEvents(
HierarchyEvent.
ANCESTOR_RESIZED, 0,
enabledOnToolkit);
}
if (
moved) {
((
Container)this).
createChildHierarchyEvents(
HierarchyEvent.
ANCESTOR_MOVED, 0,
enabledOnToolkit);
}
}
}
}
/**
* Moves and resizes this component to conform to the new
* bounding rectangle <code>r</code>. This component's new
* position is specified by <code>r.x</code> and <code>r.y</code>,
* and its new size is specified by <code>r.width</code> and
* <code>r.height</code>
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @param r the new bounding rectangle for this component
* @throws NullPointerException if {@code r} is {@code null}
* @see #getBounds
* @see #setLocation(int, int)
* @see #setLocation(Point)
* @see #setSize(int, int)
* @see #setSize(Dimension)
* @see #invalidate
* @since JDK1.1
*/
public void
setBounds(
Rectangle r) {
setBounds(
r.
x,
r.
y,
r.
width,
r.
height);
}
/**
* Returns the current x coordinate of the components origin.
* This method is preferable to writing
* <code>component.getBounds().x</code>,
* or <code>component.getLocation().x</code> because it doesn't
* cause any heap allocations.
*
* @return the current x coordinate of the components origin
* @since 1.2
*/
public int
getX() {
return
x;
}
/**
* Returns the current y coordinate of the components origin.
* This method is preferable to writing
* <code>component.getBounds().y</code>,
* or <code>component.getLocation().y</code> because it
* doesn't cause any heap allocations.
*
* @return the current y coordinate of the components origin
* @since 1.2
*/
public int
getY() {
return
y;
}
/**
* Returns the current width of this component.
* This method is preferable to writing
* <code>component.getBounds().width</code>,
* or <code>component.getSize().width</code> because it
* doesn't cause any heap allocations.
*
* @return the current width of this component
* @since 1.2
*/
public int
getWidth() {
return
width;
}
/**
* Returns the current height of this component.
* This method is preferable to writing
* <code>component.getBounds().height</code>,
* or <code>component.getSize().height</code> because it
* doesn't cause any heap allocations.
*
* @return the current height of this component
* @since 1.2
*/
public int
getHeight() {
return
height;
}
/**
* Stores the bounds of this component into "return value" <b>rv</b> and
* return <b>rv</b>. If rv is <code>null</code> a new
* <code>Rectangle</code> is allocated.
* This version of <code>getBounds</code> is useful if the caller
* wants to avoid allocating a new <code>Rectangle</code> object
* on the heap.
*
* @param rv the return value, modified to the components bounds
* @return rv
*/
public
Rectangle getBounds(
Rectangle rv) {
if (
rv == null) {
return new
Rectangle(
getX(),
getY(),
getWidth(),
getHeight());
}
else {
rv.
setBounds(
getX(),
getY(),
getWidth(),
getHeight());
return
rv;
}
}
/**
* Stores the width/height of this component into "return value" <b>rv</b>
* and return <b>rv</b>. If rv is <code>null</code> a new
* <code>Dimension</code> object is allocated. This version of
* <code>getSize</code> is useful if the caller wants to avoid
* allocating a new <code>Dimension</code> object on the heap.
*
* @param rv the return value, modified to the components size
* @return rv
*/
public
Dimension getSize(
Dimension rv) {
if (
rv == null) {
return new
Dimension(
getWidth(),
getHeight());
}
else {
rv.
setSize(
getWidth(),
getHeight());
return
rv;
}
}
/**
* Stores the x,y origin of this component into "return value" <b>rv</b>
* and return <b>rv</b>. If rv is <code>null</code> a new
* <code>Point</code> is allocated.
* This version of <code>getLocation</code> is useful if the
* caller wants to avoid allocating a new <code>Point</code>
* object on the heap.
*
* @param rv the return value, modified to the components location
* @return rv
*/
public
Point getLocation(
Point rv) {
if (
rv == null) {
return new
Point(
getX(),
getY());
}
else {
rv.
setLocation(
getX(),
getY());
return
rv;
}
}
/**
* Returns true if this component is completely opaque, returns
* false by default.
* <p>
* An opaque component paints every pixel within its
* rectangular region. A non-opaque component paints only some of
* its pixels, allowing the pixels underneath it to "show through".
* A component that does not fully paint its pixels therefore
* provides a degree of transparency.
* <p>
* Subclasses that guarantee to always completely paint their
* contents should override this method and return true.
*
* @return true if this component is completely opaque
* @see #isLightweight
* @since 1.2
*/
public boolean
isOpaque() {
if (
getPeer() == null) {
return false;
}
else {
return !
isLightweight();
}
}
/**
* A lightweight component doesn't have a native toolkit peer.
* Subclasses of <code>Component</code> and <code>Container</code>,
* other than the ones defined in this package like <code>Button</code>
* or <code>Scrollbar</code>, are lightweight.
* All of the Swing components are lightweights.
* <p>
* This method will always return <code>false</code> if this component
* is not displayable because it is impossible to determine the
* weight of an undisplayable component.
*
* @return true if this component has a lightweight peer; false if
* it has a native peer or no peer
* @see #isDisplayable
* @since 1.2
*/
public boolean
isLightweight() {
return
getPeer() instanceof
LightweightPeer;
}
/**
* Sets the preferred size of this component to a constant
* value. Subsequent calls to <code>getPreferredSize</code> will always
* return this value. Setting the preferred size to <code>null</code>
* restores the default behavior.
*
* @param preferredSize The new preferred size, or null
* @see #getPreferredSize
* @see #isPreferredSizeSet
* @since 1.5
*/
public void
setPreferredSize(
Dimension preferredSize) {
Dimension old;
// If the preferred size was set, use it as the old value, otherwise
// use null to indicate we didn't previously have a set preferred
// size.
if (
prefSizeSet) {
old = this.
prefSize;
}
else {
old = null;
}
this.
prefSize =
preferredSize;
prefSizeSet = (
preferredSize != null);
firePropertyChange("preferredSize",
old,
preferredSize);
}
/**
* Returns true if the preferred size has been set to a
* non-<code>null</code> value otherwise returns false.
*
* @return true if <code>setPreferredSize</code> has been invoked
* with a non-null value.
* @since 1.5
*/
public boolean
isPreferredSizeSet() {
return
prefSizeSet;
}
/**
* Gets the preferred size of this component.
* @return a dimension object indicating this component's preferred size
* @see #getMinimumSize
* @see LayoutManager
*/
public
Dimension getPreferredSize() {
return
preferredSize();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getPreferredSize()</code>.
*/
@
Deprecated
public
Dimension preferredSize() {
/* Avoid grabbing the lock if a reasonable cached size value
* is available.
*/
Dimension dim =
prefSize;
if (
dim == null || !(
isPreferredSizeSet() ||
isValid())) {
synchronized (
getTreeLock()) {
prefSize = (
peer != null) ?
peer.
getPreferredSize() :
getMinimumSize();
dim =
prefSize;
}
}
return new
Dimension(
dim);
}
/**
* Sets the minimum size of this component to a constant
* value. Subsequent calls to <code>getMinimumSize</code> will always
* return this value. Setting the minimum size to <code>null</code>
* restores the default behavior.
*
* @param minimumSize the new minimum size of this component
* @see #getMinimumSize
* @see #isMinimumSizeSet
* @since 1.5
*/
public void
setMinimumSize(
Dimension minimumSize) {
Dimension old;
// If the minimum size was set, use it as the old value, otherwise
// use null to indicate we didn't previously have a set minimum
// size.
if (
minSizeSet) {
old = this.
minSize;
}
else {
old = null;
}
this.
minSize =
minimumSize;
minSizeSet = (
minimumSize != null);
firePropertyChange("minimumSize",
old,
minimumSize);
}
/**
* Returns whether or not <code>setMinimumSize</code> has been
* invoked with a non-null value.
*
* @return true if <code>setMinimumSize</code> has been invoked with a
* non-null value.
* @since 1.5
*/
public boolean
isMinimumSizeSet() {
return
minSizeSet;
}
/**
* Gets the minimum size of this component.
* @return a dimension object indicating this component's minimum size
* @see #getPreferredSize
* @see LayoutManager
*/
public
Dimension getMinimumSize() {
return
minimumSize();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>getMinimumSize()</code>.
*/
@
Deprecated
public
Dimension minimumSize() {
/* Avoid grabbing the lock if a reasonable cached size value
* is available.
*/
Dimension dim =
minSize;
if (
dim == null || !(
isMinimumSizeSet() ||
isValid())) {
synchronized (
getTreeLock()) {
minSize = (
peer != null) ?
peer.
getMinimumSize() :
size();
dim =
minSize;
}
}
return new
Dimension(
dim);
}
/**
* Sets the maximum size of this component to a constant
* value. Subsequent calls to <code>getMaximumSize</code> will always
* return this value. Setting the maximum size to <code>null</code>
* restores the default behavior.
*
* @param maximumSize a <code>Dimension</code> containing the
* desired maximum allowable size
* @see #getMaximumSize
* @see #isMaximumSizeSet
* @since 1.5
*/
public void
setMaximumSize(
Dimension maximumSize) {
// If the maximum size was set, use it as the old value, otherwise
// use null to indicate we didn't previously have a set maximum
// size.
Dimension old;
if (
maxSizeSet) {
old = this.
maxSize;
}
else {
old = null;
}
this.
maxSize =
maximumSize;
maxSizeSet = (
maximumSize != null);
firePropertyChange("maximumSize",
old,
maximumSize);
}
/**
* Returns true if the maximum size has been set to a non-<code>null</code>
* value otherwise returns false.
*
* @return true if <code>maximumSize</code> is non-<code>null</code>,
* false otherwise
* @since 1.5
*/
public boolean
isMaximumSizeSet() {
return
maxSizeSet;
}
/**
* Gets the maximum size of this component.
* @return a dimension object indicating this component's maximum size
* @see #getMinimumSize
* @see #getPreferredSize
* @see LayoutManager
*/
public
Dimension getMaximumSize() {
if (
isMaximumSizeSet()) {
return new
Dimension(
maxSize);
}
return new
Dimension(
Short.
MAX_VALUE,
Short.
MAX_VALUE);
}
/**
* Returns the alignment along the x axis. This specifies how
* the component would like to be aligned relative to other
* components. The value should be a number between 0 and 1
* where 0 represents alignment along the origin, 1 is aligned
* the furthest away from the origin, 0.5 is centered, etc.
*/
public float
getAlignmentX() {
return
CENTER_ALIGNMENT;
}
/**
* Returns the alignment along the y axis. This specifies how
* the component would like to be aligned relative to other
* components. The value should be a number between 0 and 1
* where 0 represents alignment along the origin, 1 is aligned
* the furthest away from the origin, 0.5 is centered, etc.
*/
public float
getAlignmentY() {
return
CENTER_ALIGNMENT;
}
/**
* Returns the baseline. The baseline is measured from the top of
* the component. This method is primarily meant for
* <code>LayoutManager</code>s to align components along their
* baseline. A return value less than 0 indicates this component
* does not have a reasonable baseline and that
* <code>LayoutManager</code>s should not align this component on
* its baseline.
* <p>
* The default implementation returns -1. Subclasses that support
* baseline should override appropriately. If a value >= 0 is
* returned, then the component has a valid baseline for any
* size >= the minimum size and <code>getBaselineResizeBehavior</code>
* can be used to determine how the baseline changes with size.
*
* @param width the width to get the baseline for
* @param height the height to get the baseline for
* @return the baseline or < 0 indicating there is no reasonable
* baseline
* @throws IllegalArgumentException if width or height is < 0
* @see #getBaselineResizeBehavior
* @see java.awt.FontMetrics
* @since 1.6
*/
public int
getBaseline(int
width, int
height) {
if (
width < 0 ||
height < 0) {
throw new
IllegalArgumentException(
"Width and height must be >= 0");
}
return -1;
}
/**
* Returns an enum indicating how the baseline of the component
* changes as the size changes. This method is primarily meant for
* layout managers and GUI builders.
* <p>
* The default implementation returns
* <code>BaselineResizeBehavior.OTHER</code>. Subclasses that have a
* baseline should override appropriately. Subclasses should
* never return <code>null</code>; if the baseline can not be
* calculated return <code>BaselineResizeBehavior.OTHER</code>. Callers
* should first ask for the baseline using
* <code>getBaseline</code> and if a value >= 0 is returned use
* this method. It is acceptable for this method to return a
* value other than <code>BaselineResizeBehavior.OTHER</code> even if
* <code>getBaseline</code> returns a value less than 0.
*
* @return an enum indicating how the baseline changes as the component
* size changes
* @see #getBaseline(int, int)
* @since 1.6
*/
public
BaselineResizeBehavior getBaselineResizeBehavior() {
return
BaselineResizeBehavior.
OTHER;
}
/**
* Prompts the layout manager to lay out this component. This is
* usually called when the component (more specifically, container)
* is validated.
* @see #validate
* @see LayoutManager
*/
public void
doLayout() {
layout();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>doLayout()</code>.
*/
@
Deprecated
public void
layout() {
}
/**
* Validates this component.
* <p>
* The meaning of the term <i>validating</i> is defined by the ancestors of
* this class. See {@link Container#validate} for more details.
*
* @see #invalidate
* @see #doLayout()
* @see LayoutManager
* @see Container#validate
* @since JDK1.0
*/
public void
validate() {
synchronized (
getTreeLock()) {
ComponentPeer peer = this.
peer;
boolean
wasValid =
isValid();
if (!
wasValid &&
peer != null) {
Font newfont =
getFont();
Font oldfont =
peerFont;
if (
newfont !=
oldfont && (
oldfont == null
|| !
oldfont.
equals(
newfont))) {
peer.
setFont(
newfont);
peerFont =
newfont;
}
peer.
layout();
}
valid = true;
if (!
wasValid) {
mixOnValidating();
}
}
}
/**
* Invalidates this component and its ancestors.
* <p>
* By default, all the ancestors of the component up to the top-most
* container of the hierarchy are marked invalid. If the {@code
* java.awt.smartInvalidate} system property is set to {@code true},
* invalidation stops on the nearest validate root of this component.
* Marking a container <i>invalid</i> indicates that the container needs to
* be laid out.
* <p>
* This method is called automatically when any layout-related information
* changes (e.g. setting the bounds of the component, or adding the
* component to a container).
* <p>
* This method might be called often, so it should work fast.
*
* @see #validate
* @see #doLayout
* @see LayoutManager
* @see java.awt.Container#isValidateRoot
* @since JDK1.0
*/
public void
invalidate() {
synchronized (
getTreeLock()) {
/* Nullify cached layout and size information.
* For efficiency, propagate invalidate() upwards only if
* some other component hasn't already done so first.
*/
valid = false;
if (!
isPreferredSizeSet()) {
prefSize = null;
}
if (!
isMinimumSizeSet()) {
minSize = null;
}
if (!
isMaximumSizeSet()) {
maxSize = null;
}
invalidateParent();
}
}
/**
* Invalidates the parent of this component if any.
*
* This method MUST BE invoked under the TreeLock.
*/
void
invalidateParent() {
if (
parent != null) {
parent.
invalidateIfValid();
}
}
/** Invalidates the component unless it is already invalid.
*/
final void
invalidateIfValid() {
if (
isValid()) {
invalidate();
}
}
/**
* Revalidates the component hierarchy up to the nearest validate root.
* <p>
* This method first invalidates the component hierarchy starting from this
* component up to the nearest validate root. Afterwards, the component
* hierarchy is validated starting from the nearest validate root.
* <p>
* This is a convenience method supposed to help application developers
* avoid looking for validate roots manually. Basically, it's equivalent to
* first calling the {@link #invalidate()} method on this component, and
* then calling the {@link #validate()} method on the nearest validate
* root.
*
* @see Container#isValidateRoot
* @since 1.7
*/
public void
revalidate() {
revalidateSynchronously();
}
/**
* Revalidates the component synchronously.
*/
final void
revalidateSynchronously() {
synchronized (
getTreeLock()) {
invalidate();
Container root =
getContainer();
if (
root == null) {
// There's no parents. Just validate itself.
validate();
} else {
while (!
root.
isValidateRoot()) {
if (
root.
getContainer() == null) {
// If there's no validate roots, we'll validate the
// topmost container
break;
}
root =
root.
getContainer();
}
root.
validate();
}
}
}
/**
* Creates a graphics context for this component. This method will
* return <code>null</code> if this component is currently not
* displayable.
* @return a graphics context for this component, or <code>null</code>
* if it has none
* @see #paint
* @since JDK1.0
*/
public
Graphics getGraphics() {
if (
peer instanceof
LightweightPeer) {
// This is for a lightweight component, need to
// translate coordinate spaces and clip relative
// to the parent.
if (
parent == null) return null;
Graphics g =
parent.
getGraphics();
if (
g == null) return null;
if (
g instanceof
ConstrainableGraphics) {
((
ConstrainableGraphics)
g).
constrain(
x,
y,
width,
height);
} else {
g.
translate(
x,
y);
g.
setClip(0, 0,
width,
height);
}
g.
setFont(
getFont());
return
g;
} else {
ComponentPeer peer = this.
peer;
return (
peer != null) ?
peer.
getGraphics() : null;
}
}
final
Graphics getGraphics_NoClientCode() {
ComponentPeer peer = this.
peer;
if (
peer instanceof
LightweightPeer) {
// This is for a lightweight component, need to
// translate coordinate spaces and clip relative
// to the parent.
Container parent = this.
parent;
if (
parent == null) return null;
Graphics g =
parent.
getGraphics_NoClientCode();
if (
g == null) return null;
if (
g instanceof
ConstrainableGraphics) {
((
ConstrainableGraphics)
g).
constrain(
x,
y,
width,
height);
} else {
g.
translate(
x,
y);
g.
setClip(0, 0,
width,
height);
}
g.
setFont(
getFont_NoClientCode());
return
g;
} else {
return (
peer != null) ?
peer.
getGraphics() : null;
}
}
/**
* Gets the font metrics for the specified font.
* Warning: Since Font metrics are affected by the
* {@link java.awt.font.FontRenderContext FontRenderContext} and
* this method does not provide one, it can return only metrics for
* the default render context which may not match that used when
* rendering on the Component if {@link Graphics2D} functionality is being
* used. Instead metrics can be obtained at rendering time by calling
* {@link Graphics#getFontMetrics()} or text measurement APIs on the
* {@link Font Font} class.
* @param font the font for which font metrics is to be
* obtained
* @return the font metrics for <code>font</code>
* @see #getFont
* @see #getPeer
* @see java.awt.peer.ComponentPeer#getFontMetrics(Font)
* @see Toolkit#getFontMetrics(Font)
* @since JDK1.0
*/
public
FontMetrics getFontMetrics(
Font font) {
// This is an unsupported hack, but left in for a customer.
// Do not remove.
FontManager fm =
FontManagerFactory.
getInstance();
if (
fm instanceof
SunFontManager
&& ((
SunFontManager)
fm).
usePlatformFontMetrics()) {
if (
peer != null &&
!(
peer instanceof
LightweightPeer)) {
return
peer.
getFontMetrics(
font);
}
}
return sun.font.
FontDesignMetrics.
getMetrics(
font);
}
/**
* Sets the cursor image to the specified cursor. This cursor
* image is displayed when the <code>contains</code> method for
* this component returns true for the current cursor location, and
* this Component is visible, displayable, and enabled. Setting the
* cursor of a <code>Container</code> causes that cursor to be displayed
* within all of the container's subcomponents, except for those
* that have a non-<code>null</code> cursor.
* <p>
* The method may have no visual effect if the Java platform
* implementation and/or the native system do not support
* changing the mouse cursor shape.
* @param cursor One of the constants defined
* by the <code>Cursor</code> class;
* if this parameter is <code>null</code>
* then this component will inherit
* the cursor of its parent
* @see #isEnabled
* @see #isShowing
* @see #getCursor
* @see #contains
* @see Toolkit#createCustomCursor
* @see Cursor
* @since JDK1.1
*/
public void
setCursor(
Cursor cursor) {
this.
cursor =
cursor;
updateCursorImmediately();
}
/**
* Updates the cursor. May not be invoked from the native
* message pump.
*/
final void
updateCursorImmediately() {
if (
peer instanceof
LightweightPeer) {
Container nativeContainer =
getNativeContainer();
if (
nativeContainer == null) return;
ComponentPeer cPeer =
nativeContainer.
getPeer();
if (
cPeer != null) {
cPeer.
updateCursorImmediately();
}
} else if (
peer != null) {
peer.
updateCursorImmediately();
}
}
/**
* Gets the cursor set in the component. If the component does
* not have a cursor set, the cursor of its parent is returned.
* If no cursor is set in the entire hierarchy,
* <code>Cursor.DEFAULT_CURSOR</code> is returned.
* @see #setCursor
* @since JDK1.1
*/
public
Cursor getCursor() {
return
getCursor_NoClientCode();
}
final
Cursor getCursor_NoClientCode() {
Cursor cursor = this.
cursor;
if (
cursor != null) {
return
cursor;
}
Container parent = this.
parent;
if (
parent != null) {
return
parent.
getCursor_NoClientCode();
} else {
return
Cursor.
getPredefinedCursor(
Cursor.
DEFAULT_CURSOR);
}
}
/**
* Returns whether the cursor has been explicitly set for this Component.
* If this method returns <code>false</code>, this Component is inheriting
* its cursor from an ancestor.
*
* @return <code>true</code> if the cursor has been explicitly set for this
* Component; <code>false</code> otherwise.
* @since 1.4
*/
public boolean
isCursorSet() {
return (
cursor != null);
}
/**
* Paints this component.
* <p>
* This method is called when the contents of the component should
* be painted; such as when the component is first being shown or
* is damaged and in need of repair. The clip rectangle in the
* <code>Graphics</code> parameter is set to the area
* which needs to be painted.
* Subclasses of <code>Component</code> that override this
* method need not call <code>super.paint(g)</code>.
* <p>
* For performance reasons, <code>Component</code>s with zero width
* or height aren't considered to need painting when they are first shown,
* and also aren't considered to need repair.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param g the graphics context to use for painting
* @see #update
* @since JDK1.0
*/
public void
paint(
Graphics g) {
}
/**
* Updates this component.
* <p>
* If this component is not a lightweight component, the
* AWT calls the <code>update</code> method in response to
* a call to <code>repaint</code>. You can assume that
* the background is not cleared.
* <p>
* The <code>update</code> method of <code>Component</code>
* calls this component's <code>paint</code> method to redraw
* this component. This method is commonly overridden by subclasses
* which need to do additional work in response to a call to
* <code>repaint</code>.
* Subclasses of Component that override this method should either
* call <code>super.update(g)</code>, or call <code>paint(g)</code>
* directly from their <code>update</code> method.
* <p>
* The origin of the graphics context, its
* (<code>0</code>, <code>0</code>) coordinate point, is the
* top-left corner of this component. The clipping region of the
* graphics context is the bounding rectangle of this component.
*
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param g the specified context to use for updating
* @see #paint
* @see #repaint()
* @since JDK1.0
*/
public void
update(
Graphics g) {
paint(
g);
}
/**
* Paints this component and all of its subcomponents.
* <p>
* The origin of the graphics context, its
* (<code>0</code>, <code>0</code>) coordinate point, is the
* top-left corner of this component. The clipping region of the
* graphics context is the bounding rectangle of this component.
*
* @param g the graphics context to use for painting
* @see #paint
* @since JDK1.0
*/
public void
paintAll(
Graphics g) {
if (
isShowing()) {
GraphicsCallback.
PeerPaintCallback.
getInstance().
runOneComponent(this, new
Rectangle(0, 0,
width,
height),
g,
g.
getClip(),
GraphicsCallback.
LIGHTWEIGHTS |
GraphicsCallback.
HEAVYWEIGHTS);
}
}
/**
* Simulates the peer callbacks into java.awt for painting of
* lightweight Components.
* @param g the graphics context to use for painting
* @see #paintAll
*/
void
lightweightPaint(
Graphics g) {
paint(
g);
}
/**
* Paints all the heavyweight subcomponents.
*/
void
paintHeavyweightComponents(
Graphics g) {
}
/**
* Repaints this component.
* <p>
* If this component is a lightweight component, this method
* causes a call to this component's <code>paint</code>
* method as soon as possible. Otherwise, this method causes
* a call to this component's <code>update</code> method as soon
* as possible.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @see #update(Graphics)
* @since JDK1.0
*/
public void
repaint() {
repaint(0, 0, 0,
width,
height);
}
/**
* Repaints the component. If this component is a lightweight
* component, this results in a call to <code>paint</code>
* within <code>tm</code> milliseconds.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param tm maximum time in milliseconds before update
* @see #paint
* @see #update(Graphics)
* @since JDK1.0
*/
public void
repaint(long
tm) {
repaint(
tm, 0, 0,
width,
height);
}
/**
* Repaints the specified rectangle of this component.
* <p>
* If this component is a lightweight component, this method
* causes a call to this component's <code>paint</code> method
* as soon as possible. Otherwise, this method causes a call to
* this component's <code>update</code> method as soon as possible.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param x the <i>x</i> coordinate
* @param y the <i>y</i> coordinate
* @param width the width
* @param height the height
* @see #update(Graphics)
* @since JDK1.0
*/
public void
repaint(int
x, int
y, int
width, int
height) {
repaint(0,
x,
y,
width,
height);
}
/**
* Repaints the specified rectangle of this component within
* <code>tm</code> milliseconds.
* <p>
* If this component is a lightweight component, this method causes
* a call to this component's <code>paint</code> method.
* Otherwise, this method causes a call to this component's
* <code>update</code> method.
* <p>
* <b>Note</b>: For more information on the paint mechanisms utilitized
* by AWT and Swing, including information on how to write the most
* efficient painting code, see
* <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
*
* @param tm maximum time in milliseconds before update
* @param x the <i>x</i> coordinate
* @param y the <i>y</i> coordinate
* @param width the width
* @param height the height
* @see #update(Graphics)
* @since JDK1.0
*/
public void
repaint(long
tm, int
x, int
y, int
width, int
height) {
if (this.
peer instanceof
LightweightPeer) {
// Needs to be translated to parent coordinates since
// a parent native container provides the actual repaint
// services. Additionally, the request is restricted to
// the bounds of the component.
if (
parent != null) {
if (
x < 0) {
width +=
x;
x = 0;
}
if (
y < 0) {
height +=
y;
y = 0;
}
int
pwidth = (
width > this.
width) ? this.
width :
width;
int
pheight = (
height > this.
height) ? this.
height :
height;
if (
pwidth <= 0 ||
pheight <= 0) {
return;
}
int
px = this.
x +
x;
int
py = this.
y +
y;
parent.
repaint(
tm,
px,
py,
pwidth,
pheight);
}
} else {
if (
isVisible() && (this.
peer != null) &&
(
width > 0) && (
height > 0)) {
PaintEvent e = new
PaintEvent(this,
PaintEvent.
UPDATE,
new
Rectangle(
x,
y,
width,
height));
SunToolkit.
postEvent(
SunToolkit.
targetToAppContext(this),
e);
}
}
}
/**
* Prints this component. Applications should override this method
* for components that must do special processing before being
* printed or should be printed differently than they are painted.
* <p>
* The default implementation of this method calls the
* <code>paint</code> method.
* <p>
* The origin of the graphics context, its
* (<code>0</code>, <code>0</code>) coordinate point, is the
* top-left corner of this component. The clipping region of the
* graphics context is the bounding rectangle of this component.
* @param g the graphics context to use for printing
* @see #paint(Graphics)
* @since JDK1.0
*/
public void
print(
Graphics g) {
paint(
g);
}
/**
* Prints this component and all of its subcomponents.
* <p>
* The origin of the graphics context, its
* (<code>0</code>, <code>0</code>) coordinate point, is the
* top-left corner of this component. The clipping region of the
* graphics context is the bounding rectangle of this component.
* @param g the graphics context to use for printing
* @see #print(Graphics)
* @since JDK1.0
*/
public void
printAll(
Graphics g) {
if (
isShowing()) {
GraphicsCallback.
PeerPrintCallback.
getInstance().
runOneComponent(this, new
Rectangle(0, 0,
width,
height),
g,
g.
getClip(),
GraphicsCallback.
LIGHTWEIGHTS |
GraphicsCallback.
HEAVYWEIGHTS);
}
}
/**
* Simulates the peer callbacks into java.awt for printing of
* lightweight Components.
* @param g the graphics context to use for printing
* @see #printAll
*/
void
lightweightPrint(
Graphics g) {
print(
g);
}
/**
* Prints all the heavyweight subcomponents.
*/
void
printHeavyweightComponents(
Graphics g) {
}
private
Insets getInsets_NoClientCode() {
ComponentPeer peer = this.
peer;
if (
peer instanceof
ContainerPeer) {
return (
Insets)((
ContainerPeer)
peer).
getInsets().
clone();
}
return new
Insets(0, 0, 0, 0);
}
/**
* Repaints the component when the image has changed.
* This <code>imageUpdate</code> method of an <code>ImageObserver</code>
* is called when more information about an
* image which had been previously requested using an asynchronous
* routine such as the <code>drawImage</code> method of
* <code>Graphics</code> becomes available.
* See the definition of <code>imageUpdate</code> for
* more information on this method and its arguments.
* <p>
* The <code>imageUpdate</code> method of <code>Component</code>
* incrementally draws an image on the component as more of the bits
* of the image are available.
* <p>
* If the system property <code>awt.image.incrementaldraw</code>
* is missing or has the value <code>true</code>, the image is
* incrementally drawn. If the system property has any other value,
* then the image is not drawn until it has been completely loaded.
* <p>
* Also, if incremental drawing is in effect, the value of the
* system property <code>awt.image.redrawrate</code> is interpreted
* as an integer to give the maximum redraw rate, in milliseconds. If
* the system property is missing or cannot be interpreted as an
* integer, the redraw rate is once every 100ms.
* <p>
* The interpretation of the <code>x</code>, <code>y</code>,
* <code>width</code>, and <code>height</code> arguments depends on
* the value of the <code>infoflags</code> argument.
*
* @param img the image being observed
* @param infoflags see <code>imageUpdate</code> for more information
* @param x the <i>x</i> coordinate
* @param y the <i>y</i> coordinate
* @param w the width
* @param h the height
* @return <code>false</code> if the infoflags indicate that the
* image is completely loaded; <code>true</code> otherwise.
*
* @see java.awt.image.ImageObserver
* @see Graphics#drawImage(Image, int, int, Color, java.awt.image.ImageObserver)
* @see Graphics#drawImage(Image, int, int, java.awt.image.ImageObserver)
* @see Graphics#drawImage(Image, int, int, int, int, Color, java.awt.image.ImageObserver)
* @see Graphics#drawImage(Image, int, int, int, int, java.awt.image.ImageObserver)
* @see java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
* @since JDK1.0
*/
public boolean
imageUpdate(
Image img, int
infoflags,
int
x, int
y, int
w, int
h) {
int
rate = -1;
if ((
infoflags & (
FRAMEBITS|
ALLBITS)) != 0) {
rate = 0;
} else if ((
infoflags &
SOMEBITS) != 0) {
if (
isInc) {
rate =
incRate;
if (
rate < 0) {
rate = 0;
}
}
}
if (
rate >= 0) {
repaint(
rate, 0, 0,
width,
height);
}
return (
infoflags & (
ALLBITS|
ABORT)) == 0;
}
/**
* Creates an image from the specified image producer.
* @param producer the image producer
* @return the image produced
* @since JDK1.0
*/
public
Image createImage(
ImageProducer producer) {
ComponentPeer peer = this.
peer;
if ((
peer != null) && ! (
peer instanceof
LightweightPeer)) {
return
peer.
createImage(
producer);
}
return
getToolkit().
createImage(
producer);
}
/**
* Creates an off-screen drawable image
* to be used for double buffering.
* @param width the specified width
* @param height the specified height
* @return an off-screen drawable image, which can be used for double
* buffering. The return value may be <code>null</code> if the
* component is not displayable. This will always happen if
* <code>GraphicsEnvironment.isHeadless()</code> returns
* <code>true</code>.
* @see #isDisplayable
* @see GraphicsEnvironment#isHeadless
* @since JDK1.0
*/
public
Image createImage(int
width, int
height) {
ComponentPeer peer = this.
peer;
if (
peer instanceof
LightweightPeer) {
if (
parent != null) { return
parent.
createImage(
width,
height); }
else { return null;}
} else {
return (
peer != null) ?
peer.
createImage(
width,
height) : null;
}
}
/**
* Creates a volatile off-screen drawable image
* to be used for double buffering.
* @param width the specified width.
* @param height the specified height.
* @return an off-screen drawable image, which can be used for double
* buffering. The return value may be <code>null</code> if the
* component is not displayable. This will always happen if
* <code>GraphicsEnvironment.isHeadless()</code> returns
* <code>true</code>.
* @see java.awt.image.VolatileImage
* @see #isDisplayable
* @see GraphicsEnvironment#isHeadless
* @since 1.4
*/
public
VolatileImage createVolatileImage(int
width, int
height) {
ComponentPeer peer = this.
peer;
if (
peer instanceof
LightweightPeer) {
if (
parent != null) {
return
parent.
createVolatileImage(
width,
height);
}
else { return null;}
} else {
return (
peer != null) ?
peer.
createVolatileImage(
width,
height) : null;
}
}
/**
* Creates a volatile off-screen drawable image, with the given capabilities.
* The contents of this image may be lost at any time due
* to operating system issues, so the image must be managed
* via the <code>VolatileImage</code> interface.
* @param width the specified width.
* @param height the specified height.
* @param caps the image capabilities
* @exception AWTException if an image with the specified capabilities cannot
* be created
* @return a VolatileImage object, which can be used
* to manage surface contents loss and capabilities.
* @see java.awt.image.VolatileImage
* @since 1.4
*/
public
VolatileImage createVolatileImage(int
width, int
height,
ImageCapabilities caps) throws
AWTException {
// REMIND : check caps
return
createVolatileImage(
width,
height);
}
/**
* Prepares an image for rendering on this component. The image
* data is downloaded asynchronously in another thread and the
* appropriate screen representation of the image is generated.
* @param image the <code>Image</code> for which to
* prepare a screen representation
* @param observer the <code>ImageObserver</code> object
* to be notified as the image is being prepared
* @return <code>true</code> if the image has already been fully
* prepared; <code>false</code> otherwise
* @since JDK1.0
*/
public boolean
prepareImage(
Image image,
ImageObserver observer) {
return
prepareImage(
image, -1, -1,
observer);
}
/**
* Prepares an image for rendering on this component at the
* specified width and height.
* <p>
* The image data is downloaded asynchronously in another thread,
* and an appropriately scaled screen representation of the image is
* generated.
* @param image the instance of <code>Image</code>
* for which to prepare a screen representation
* @param width the width of the desired screen representation
* @param height the height of the desired screen representation
* @param observer the <code>ImageObserver</code> object
* to be notified as the image is being prepared
* @return <code>true</code> if the image has already been fully
* prepared; <code>false</code> otherwise
* @see java.awt.image.ImageObserver
* @since JDK1.0
*/
public boolean
prepareImage(
Image image, int
width, int
height,
ImageObserver observer) {
ComponentPeer peer = this.
peer;
if (
peer instanceof
LightweightPeer) {
return (
parent != null)
?
parent.
prepareImage(
image,
width,
height,
observer)
:
getToolkit().
prepareImage(
image,
width,
height,
observer);
} else {
return (
peer != null)
?
peer.
prepareImage(
image,
width,
height,
observer)
:
getToolkit().
prepareImage(
image,
width,
height,
observer);
}
}
/**
* Returns the status of the construction of a screen representation
* of the specified image.
* <p>
* This method does not cause the image to begin loading. An
* application must use the <code>prepareImage</code> method
* to force the loading of an image.
* <p>
* Information on the flags returned by this method can be found
* with the discussion of the <code>ImageObserver</code> interface.
* @param image the <code>Image</code> object whose status
* is being checked
* @param observer the <code>ImageObserver</code>
* object to be notified as the image is being prepared
* @return the bitwise inclusive <b>OR</b> of
* <code>ImageObserver</code> flags indicating what
* information about the image is currently available
* @see #prepareImage(Image, int, int, java.awt.image.ImageObserver)
* @see Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver)
* @see java.awt.image.ImageObserver
* @since JDK1.0
*/
public int
checkImage(
Image image,
ImageObserver observer) {
return
checkImage(
image, -1, -1,
observer);
}
/**
* Returns the status of the construction of a screen representation
* of the specified image.
* <p>
* This method does not cause the image to begin loading. An
* application must use the <code>prepareImage</code> method
* to force the loading of an image.
* <p>
* The <code>checkImage</code> method of <code>Component</code>
* calls its peer's <code>checkImage</code> method to calculate
* the flags. If this component does not yet have a peer, the
* component's toolkit's <code>checkImage</code> method is called
* instead.
* <p>
* Information on the flags returned by this method can be found
* with the discussion of the <code>ImageObserver</code> interface.
* @param image the <code>Image</code> object whose status
* is being checked
* @param width the width of the scaled version
* whose status is to be checked
* @param height the height of the scaled version
* whose status is to be checked
* @param observer the <code>ImageObserver</code> object
* to be notified as the image is being prepared
* @return the bitwise inclusive <b>OR</b> of
* <code>ImageObserver</code> flags indicating what
* information about the image is currently available
* @see #prepareImage(Image, int, int, java.awt.image.ImageObserver)
* @see Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver)
* @see java.awt.image.ImageObserver
* @since JDK1.0
*/
public int
checkImage(
Image image, int
width, int
height,
ImageObserver observer) {
ComponentPeer peer = this.
peer;
if (
peer instanceof
LightweightPeer) {
return (
parent != null)
?
parent.
checkImage(
image,
width,
height,
observer)
:
getToolkit().
checkImage(
image,
width,
height,
observer);
} else {
return (
peer != null)
?
peer.
checkImage(
image,
width,
height,
observer)
:
getToolkit().
checkImage(
image,
width,
height,
observer);
}
}
/**
* Creates a new strategy for multi-buffering on this component.
* Multi-buffering is useful for rendering performance. This method
* attempts to create the best strategy available with the number of
* buffers supplied. It will always create a <code>BufferStrategy</code>
* with that number of buffers.
* A page-flipping strategy is attempted first, then a blitting strategy
* using accelerated buffers. Finally, an unaccelerated blitting
* strategy is used.
* <p>
* Each time this method is called,
* the existing buffer strategy for this component is discarded.
* @param numBuffers number of buffers to create, including the front buffer
* @exception IllegalArgumentException if numBuffers is less than 1.
* @exception IllegalStateException if the component is not displayable
* @see #isDisplayable
* @see Window#getBufferStrategy()
* @see Canvas#getBufferStrategy()
* @since 1.4
*/
void
createBufferStrategy(int
numBuffers) {
BufferCapabilities bufferCaps;
if (
numBuffers > 1) {
// Try to create a page-flipping strategy
bufferCaps = new
BufferCapabilities(new
ImageCapabilities(true),
new
ImageCapabilities(true),
BufferCapabilities.
FlipContents.
UNDEFINED);
try {
createBufferStrategy(
numBuffers,
bufferCaps);
return; // Success
} catch (
AWTException e) {
// Failed
}
}
// Try a blitting (but still accelerated) strategy
bufferCaps = new
BufferCapabilities(new
ImageCapabilities(true),
new
ImageCapabilities(true),
null);
try {
createBufferStrategy(
numBuffers,
bufferCaps);
return; // Success
} catch (
AWTException e) {
// Failed
}
// Try an unaccelerated blitting strategy
bufferCaps = new
BufferCapabilities(new
ImageCapabilities(false),
new
ImageCapabilities(false),
null);
try {
createBufferStrategy(
numBuffers,
bufferCaps);
return; // Success
} catch (
AWTException e) {
// Code should never reach here (an unaccelerated blitting
// strategy should always work)
throw new
InternalError("Could not create a buffer strategy",
e);
}
}
/**
* Creates a new strategy for multi-buffering on this component with the
* required buffer capabilities. This is useful, for example, if only
* accelerated memory or page flipping is desired (as specified by the
* buffer capabilities).
* <p>
* Each time this method
* is called, <code>dispose</code> will be invoked on the existing
* <code>BufferStrategy</code>.
* @param numBuffers number of buffers to create
* @param caps the required capabilities for creating the buffer strategy;
* cannot be <code>null</code>
* @exception AWTException if the capabilities supplied could not be
* supported or met; this may happen, for example, if there is not enough
* accelerated memory currently available, or if page flipping is specified
* but not possible.
* @exception IllegalArgumentException if numBuffers is less than 1, or if
* caps is <code>null</code>
* @see Window#getBufferStrategy()
* @see Canvas#getBufferStrategy()
* @since 1.4
*/
void
createBufferStrategy(int
numBuffers,
BufferCapabilities caps) throws
AWTException {
// Check arguments
if (
numBuffers < 1) {
throw new
IllegalArgumentException(
"Number of buffers must be at least 1");
}
if (
caps == null) {
throw new
IllegalArgumentException("No capabilities specified");
}
// Destroy old buffers
if (
bufferStrategy != null) {
bufferStrategy.
dispose();
}
if (
numBuffers == 1) {
bufferStrategy = new
SingleBufferStrategy(
caps);
} else {
SunGraphicsEnvironment sge = (
SunGraphicsEnvironment)
GraphicsEnvironment.
getLocalGraphicsEnvironment();
if (!
caps.
isPageFlipping() &&
sge.
isFlipStrategyPreferred(
peer)) {
caps = new
ProxyCapabilities(
caps);
}
// assert numBuffers > 1;
if (
caps.
isPageFlipping()) {
bufferStrategy = new
FlipSubRegionBufferStrategy(
numBuffers,
caps);
} else {
bufferStrategy = new
BltSubRegionBufferStrategy(
numBuffers,
caps);
}
}
}
/**
* This is a proxy capabilities class used when a FlipBufferStrategy
* is created instead of the requested Blit strategy.
*
* @see sun.java2d.SunGraphicsEnvironment#isFlipStrategyPreferred(ComponentPeer)
*/
private class
ProxyCapabilities extends
ExtendedBufferCapabilities {
private
BufferCapabilities orig;
private
ProxyCapabilities(
BufferCapabilities orig) {
super(
orig.
getFrontBufferCapabilities(),
orig.
getBackBufferCapabilities(),
orig.
getFlipContents() ==
BufferCapabilities.
FlipContents.
BACKGROUND ?
BufferCapabilities.
FlipContents.
BACKGROUND :
BufferCapabilities.
FlipContents.
COPIED);
this.
orig =
orig;
}
}
/**
* @return the buffer strategy used by this component
* @see Window#createBufferStrategy
* @see Canvas#createBufferStrategy
* @since 1.4
*/
BufferStrategy getBufferStrategy() {
return
bufferStrategy;
}
/**
* @return the back buffer currently used by this component's
* BufferStrategy. If there is no BufferStrategy or no
* back buffer, this method returns null.
*/
Image getBackBuffer() {
if (
bufferStrategy != null) {
if (
bufferStrategy instanceof
BltBufferStrategy) {
BltBufferStrategy bltBS = (
BltBufferStrategy)
bufferStrategy;
return
bltBS.
getBackBuffer();
} else if (
bufferStrategy instanceof
FlipBufferStrategy) {
FlipBufferStrategy flipBS = (
FlipBufferStrategy)
bufferStrategy;
return
flipBS.
getBackBuffer();
}
}
return null;
}
/**
* Inner class for flipping buffers on a component. That component must
* be a <code>Canvas</code> or <code>Window</code>.
* @see Canvas
* @see Window
* @see java.awt.image.BufferStrategy
* @author Michael Martak
* @since 1.4
*/
protected class
FlipBufferStrategy extends
BufferStrategy {
/**
* The number of buffers
*/
protected int
numBuffers; // = 0
/**
* The buffering capabilities
*/
protected
BufferCapabilities caps; // = null
/**
* The drawing buffer
*/
protected
Image drawBuffer; // = null
/**
* The drawing buffer as a volatile image
*/
protected
VolatileImage drawVBuffer; // = null
/**
* Whether or not the drawing buffer has been recently restored from
* a lost state.
*/
protected boolean
validatedContents; // = false
/**
* Size of the back buffers. (Note: these fields were added in 6.0
* but kept package-private to avoid exposing them in the spec.
* None of these fields/methods really should have been marked
* protected when they were introduced in 1.4, but now we just have
* to live with that decision.)
*/
int
width;
int
height;
/**
* Creates a new flipping buffer strategy for this component.
* The component must be a <code>Canvas</code> or <code>Window</code>.
* @see Canvas
* @see Window
* @param numBuffers the number of buffers
* @param caps the capabilities of the buffers
* @exception AWTException if the capabilities supplied could not be
* supported or met
* @exception ClassCastException if the component is not a canvas or
* window.
* @exception IllegalStateException if the component has no peer
* @exception IllegalArgumentException if {@code numBuffers} is less than two,
* or if {@code BufferCapabilities.isPageFlipping} is not
* {@code true}.
* @see #createBuffers(int, BufferCapabilities)
*/
protected
FlipBufferStrategy(int
numBuffers,
BufferCapabilities caps)
throws
AWTException
{
if (!(
Component.this instanceof
Window) &&
!(
Component.this instanceof
Canvas))
{
throw new
ClassCastException(
"Component must be a Canvas or Window");
}
this.
numBuffers =
numBuffers;
this.
caps =
caps;
createBuffers(
numBuffers,
caps);
}
/**
* Creates one or more complex, flipping buffers with the given
* capabilities.
* @param numBuffers number of buffers to create; must be greater than
* one
* @param caps the capabilities of the buffers.
* <code>BufferCapabilities.isPageFlipping</code> must be
* <code>true</code>.
* @exception AWTException if the capabilities supplied could not be
* supported or met
* @exception IllegalStateException if the component has no peer
* @exception IllegalArgumentException if numBuffers is less than two,
* or if <code>BufferCapabilities.isPageFlipping</code> is not
* <code>true</code>.
* @see java.awt.BufferCapabilities#isPageFlipping()
*/
protected void
createBuffers(int
numBuffers,
BufferCapabilities caps)
throws
AWTException
{
if (
numBuffers < 2) {
throw new
IllegalArgumentException(
"Number of buffers cannot be less than two");
} else if (
peer == null) {
throw new
IllegalStateException(
"Component must have a valid peer");
} else if (
caps == null || !
caps.
isPageFlipping()) {
throw new
IllegalArgumentException(
"Page flipping capabilities must be specified");
}
// save the current bounds
width =
getWidth();
height =
getHeight();
if (
drawBuffer != null) {
// dispose the existing backbuffers
drawBuffer = null;
drawVBuffer = null;
destroyBuffers();
// ... then recreate the backbuffers
}
if (
caps instanceof
ExtendedBufferCapabilities) {
ExtendedBufferCapabilities ebc =
(
ExtendedBufferCapabilities)
caps;
if (
ebc.
getVSync() ==
VSYNC_ON) {
// if this buffer strategy is not allowed to be v-synced,
// change the caps that we pass to the peer but keep on
// trying to create v-synced buffers;
// do not throw IAE here in case it is disallowed, see
// ExtendedBufferCapabilities for more info
if (!
VSyncedBSManager.
vsyncAllowed(this)) {
caps =
ebc.
derive(
VSYNC_DEFAULT);
}
}
}
peer.
createBuffers(
numBuffers,
caps);
updateInternalBuffers();
}
/**
* Updates internal buffers (both volatile and non-volatile)
* by requesting the back-buffer from the peer.
*/
private void
updateInternalBuffers() {
// get the images associated with the draw buffer
drawBuffer =
getBackBuffer();
if (
drawBuffer instanceof
VolatileImage) {
drawVBuffer = (
VolatileImage)
drawBuffer;
} else {
drawVBuffer = null;
}
}
/**
* @return direct access to the back buffer, as an image.
* @exception IllegalStateException if the buffers have not yet
* been created
*/
protected
Image getBackBuffer() {
if (
peer != null) {
return
peer.
getBackBuffer();
} else {
throw new
IllegalStateException(
"Component must have a valid peer");
}
}
/**
* Flipping moves the contents of the back buffer to the front buffer,
* either by copying or by moving the video pointer.
* @param flipAction an integer value describing the flipping action
* for the contents of the back buffer. This should be one of the
* values of the <code>BufferCapabilities.FlipContents</code>
* property.
* @exception IllegalStateException if the buffers have not yet
* been created
* @see java.awt.BufferCapabilities#getFlipContents()
*/
protected void
flip(
BufferCapabilities.
FlipContents flipAction) {
if (
peer != null) {
Image backBuffer =
getBackBuffer();
if (
backBuffer != null) {
peer.
flip(0, 0,
backBuffer.
getWidth(null),
backBuffer.
getHeight(null),
flipAction);
}
} else {
throw new
IllegalStateException(
"Component must have a valid peer");
}
}
void
flipSubRegion(int
x1, int
y1, int
x2, int
y2,
BufferCapabilities.
FlipContents flipAction)
{
if (
peer != null) {
peer.
flip(
x1,
y1,
x2,
y2,
flipAction);
} else {
throw new
IllegalStateException(
"Component must have a valid peer");
}
}
/**
* Destroys the buffers created through this object
*/
protected void
destroyBuffers() {
VSyncedBSManager.
releaseVsync(this);
if (
peer != null) {
peer.
destroyBuffers();
} else {
throw new
IllegalStateException(
"Component must have a valid peer");
}
}
/**
* @return the buffering capabilities of this strategy
*/
public
BufferCapabilities getCapabilities() {
if (
caps instanceof
ProxyCapabilities) {
return ((
ProxyCapabilities)
caps).
orig;
} else {
return
caps;
}
}
/**
* @return the graphics on the drawing buffer. This method may not
* be synchronized for performance reasons; use of this method by multiple
* threads should be handled at the application level. Disposal of the
* graphics object must be handled by the application.
*/
public
Graphics getDrawGraphics() {
revalidate();
return
drawBuffer.
getGraphics();
}
/**
* Restore the drawing buffer if it has been lost
*/
protected void
revalidate() {
revalidate(true);
}
void
revalidate(boolean
checkSize) {
validatedContents = false;
if (
checkSize && (
getWidth() !=
width ||
getHeight() !=
height)) {
// component has been resized; recreate the backbuffers
try {
createBuffers(
numBuffers,
caps);
} catch (
AWTException e) {
// shouldn't be possible
}
validatedContents = true;
}
// get the buffers from the peer every time since they
// might have been replaced in response to a display change event
updateInternalBuffers();
// now validate the backbuffer
if (
drawVBuffer != null) {
GraphicsConfiguration gc =
getGraphicsConfiguration_NoClientCode();
int
returnCode =
drawVBuffer.
validate(
gc);
if (
returnCode ==
VolatileImage.
IMAGE_INCOMPATIBLE) {
try {
createBuffers(
numBuffers,
caps);
} catch (
AWTException e) {
// shouldn't be possible
}
if (
drawVBuffer != null) {
// backbuffers were recreated, so validate again
drawVBuffer.
validate(
gc);
}
validatedContents = true;
} else if (
returnCode ==
VolatileImage.
IMAGE_RESTORED) {
validatedContents = true;
}
}
}
/**
* @return whether the drawing buffer was lost since the last call to
* <code>getDrawGraphics</code>
*/
public boolean
contentsLost() {
if (
drawVBuffer == null) {
return false;
}
return
drawVBuffer.
contentsLost();
}
/**
* @return whether the drawing buffer was recently restored from a lost
* state and reinitialized to the default background color (white)
*/
public boolean
contentsRestored() {
return
validatedContents;
}
/**
* Makes the next available buffer visible by either blitting or
* flipping.
*/
public void
show() {
flip(
caps.
getFlipContents());
}
/**
* Makes specified region of the the next available buffer visible
* by either blitting or flipping.
*/
void
showSubRegion(int
x1, int
y1, int
x2, int
y2) {
flipSubRegion(
x1,
y1,
x2,
y2,
caps.
getFlipContents());
}
/**
* {@inheritDoc}
* @since 1.6
*/
public void
dispose() {
if (
Component.this.
bufferStrategy == this) {
Component.this.
bufferStrategy = null;
if (
peer != null) {
destroyBuffers();
}
}
}
} // Inner class FlipBufferStrategy
/**
* Inner class for blitting offscreen surfaces to a component.
*
* @author Michael Martak
* @since 1.4
*/
protected class
BltBufferStrategy extends
BufferStrategy {
/**
* The buffering capabilities
*/
protected
BufferCapabilities caps; // = null
/**
* The back buffers
*/
protected
VolatileImage[]
backBuffers; // = null
/**
* Whether or not the drawing buffer has been recently restored from
* a lost state.
*/
protected boolean
validatedContents; // = false
/**
* Size of the back buffers
*/
protected int
width;
protected int
height;
/**
* Insets for the hosting Component. The size of the back buffer
* is constrained by these.
*/
private
Insets insets;
/**
* Creates a new blt buffer strategy around a component
* @param numBuffers number of buffers to create, including the
* front buffer
* @param caps the capabilities of the buffers
*/
protected
BltBufferStrategy(int
numBuffers,
BufferCapabilities caps) {
this.
caps =
caps;
createBackBuffers(
numBuffers - 1);
}
/**
* {@inheritDoc}
* @since 1.6
*/
public void
dispose() {
if (
backBuffers != null) {
for (int
counter =
backBuffers.length - 1;
counter >= 0;
counter--) {
if (
backBuffers[
counter] != null) {
backBuffers[
counter].
flush();
backBuffers[
counter] = null;
}
}
}
if (
Component.this.
bufferStrategy == this) {
Component.this.
bufferStrategy = null;
}
}
/**
* Creates the back buffers
*/
protected void
createBackBuffers(int
numBuffers) {
if (
numBuffers == 0) {
backBuffers = null;
} else {
// save the current bounds
width =
getWidth();
height =
getHeight();
insets =
getInsets_NoClientCode();
int
iWidth =
width -
insets.
left -
insets.
right;
int
iHeight =
height -
insets.
top -
insets.
bottom;
// It is possible for the component's width and/or height
// to be 0 here. Force the size of the backbuffers to
// be > 0 so that creating the image won't fail.
iWidth =
Math.
max(1,
iWidth);
iHeight =
Math.
max(1,
iHeight);
if (
backBuffers == null) {
backBuffers = new
VolatileImage[
numBuffers];
} else {
// flush any existing backbuffers
for (int
i = 0;
i <
numBuffers;
i++) {
if (
backBuffers[
i] != null) {
backBuffers[
i].
flush();
backBuffers[
i] = null;
}
}
}
// create the backbuffers
for (int
i = 0;
i <
numBuffers;
i++) {
backBuffers[
i] =
createVolatileImage(
iWidth,
iHeight);
}
}
}
/**
* @return the buffering capabilities of this strategy
*/
public
BufferCapabilities getCapabilities() {
return
caps;
}
/**
* @return the draw graphics
*/
public
Graphics getDrawGraphics() {
revalidate();
Image backBuffer =
getBackBuffer();
if (
backBuffer == null) {
return
getGraphics();
}
SunGraphics2D g = (
SunGraphics2D)
backBuffer.
getGraphics();
g.
constrain(-
insets.
left, -
insets.
top,
backBuffer.
getWidth(null) +
insets.
left,
backBuffer.
getHeight(null) +
insets.
top);
return
g;
}
/**
* @return direct access to the back buffer, as an image.
* If there is no back buffer, returns null.
*/
Image getBackBuffer() {
if (
backBuffers != null) {
return
backBuffers[
backBuffers.length - 1];
} else {
return null;
}
}
/**
* Makes the next available buffer visible.
*/
public void
show() {
showSubRegion(
insets.
left,
insets.
top,
width -
insets.
right,
height -
insets.
bottom);
}
/**
* Package-private method to present a specific rectangular area
* of this buffer. This class currently shows only the entire
* buffer, by calling showSubRegion() with the full dimensions of
* the buffer. Subclasses (e.g., BltSubRegionBufferStrategy
* and FlipSubRegionBufferStrategy) may have region-specific show
* methods that call this method with actual sub regions of the
* buffer.
*/
void
showSubRegion(int
x1, int
y1, int
x2, int
y2) {
if (
backBuffers == null) {
return;
}
// Adjust location to be relative to client area.
x1 -=
insets.
left;
x2 -=
insets.
left;
y1 -=
insets.
top;
y2 -=
insets.
top;
Graphics g =
getGraphics_NoClientCode();
if (
g == null) {
// Not showing, bail
return;
}
try {
// First image copy is in terms of Frame's coordinates, need
// to translate to client area.
g.
translate(
insets.
left,
insets.
top);
for (int
i = 0;
i <
backBuffers.length;
i++) {
g.
drawImage(
backBuffers[
i],
x1,
y1,
x2,
y2,
x1,
y1,
x2,
y2,
null);
g.
dispose();
g = null;
g =
backBuffers[
i].
getGraphics();
}
} finally {
if (
g != null) {
g.
dispose();
}
}
}
/**
* Restore the drawing buffer if it has been lost
*/
protected void
revalidate() {
revalidate(true);
}
void
revalidate(boolean
checkSize) {
validatedContents = false;
if (
backBuffers == null) {
return;
}
if (
checkSize) {
Insets insets =
getInsets_NoClientCode();
if (
getWidth() !=
width ||
getHeight() !=
height ||
!
insets.
equals(this.
insets)) {
// component has been resized; recreate the backbuffers
createBackBuffers(
backBuffers.length);
validatedContents = true;
}
}
// now validate the backbuffer
GraphicsConfiguration gc =
getGraphicsConfiguration_NoClientCode();
int
returnCode =
backBuffers[
backBuffers.length - 1].
validate(
gc);
if (
returnCode ==
VolatileImage.
IMAGE_INCOMPATIBLE) {
if (
checkSize) {
createBackBuffers(
backBuffers.length);
// backbuffers were recreated, so validate again
backBuffers[
backBuffers.length - 1].
validate(
gc);
}
// else case means we're called from Swing on the toolkit
// thread, don't recreate buffers as that'll deadlock
// (creating VolatileImages invokes getting GraphicsConfig
// which grabs treelock).
validatedContents = true;
} else if (
returnCode ==
VolatileImage.
IMAGE_RESTORED) {
validatedContents = true;
}
}
/**
* @return whether the drawing buffer was lost since the last call to
* <code>getDrawGraphics</code>
*/
public boolean
contentsLost() {
if (
backBuffers == null) {
return false;
} else {
return
backBuffers[
backBuffers.length - 1].
contentsLost();
}
}
/**
* @return whether the drawing buffer was recently restored from a lost
* state and reinitialized to the default background color (white)
*/
public boolean
contentsRestored() {
return
validatedContents;
}
} // Inner class BltBufferStrategy
/**
* Private class to perform sub-region flipping.
*/
private class
FlipSubRegionBufferStrategy extends
FlipBufferStrategy
implements
SubRegionShowable
{
protected
FlipSubRegionBufferStrategy(int
numBuffers,
BufferCapabilities caps)
throws
AWTException
{
super(
numBuffers,
caps);
}
public void
show(int
x1, int
y1, int
x2, int
y2) {
showSubRegion(
x1,
y1,
x2,
y2);
}
// This is invoked by Swing on the toolkit thread.
public boolean
showIfNotLost(int
x1, int
y1, int
x2, int
y2) {
if (!
contentsLost()) {
showSubRegion(
x1,
y1,
x2,
y2);
return !
contentsLost();
}
return false;
}
}
/**
* Private class to perform sub-region blitting. Swing will use
* this subclass via the SubRegionShowable interface in order to
* copy only the area changed during a repaint.
* See javax.swing.BufferStrategyPaintManager.
*/
private class
BltSubRegionBufferStrategy extends
BltBufferStrategy
implements
SubRegionShowable
{
protected
BltSubRegionBufferStrategy(int
numBuffers,
BufferCapabilities caps)
{
super(
numBuffers,
caps);
}
public void
show(int
x1, int
y1, int
x2, int
y2) {
showSubRegion(
x1,
y1,
x2,
y2);
}
// This method is called by Swing on the toolkit thread.
public boolean
showIfNotLost(int
x1, int
y1, int
x2, int
y2) {
if (!
contentsLost()) {
showSubRegion(
x1,
y1,
x2,
y2);
return !
contentsLost();
}
return false;
}
}
/**
* Inner class for flipping buffers on a component. That component must
* be a <code>Canvas</code> or <code>Window</code>.
* @see Canvas
* @see Window
* @see java.awt.image.BufferStrategy
* @author Michael Martak
* @since 1.4
*/
private class
SingleBufferStrategy extends
BufferStrategy {
private
BufferCapabilities caps;
public
SingleBufferStrategy(
BufferCapabilities caps) {
this.
caps =
caps;
}
public
BufferCapabilities getCapabilities() {
return
caps;
}
public
Graphics getDrawGraphics() {
return
getGraphics();
}
public boolean
contentsLost() {
return false;
}
public boolean
contentsRestored() {
return false;
}
public void
show() {
// Do nothing
}
} // Inner class SingleBufferStrategy
/**
* Sets whether or not paint messages received from the operating system
* should be ignored. This does not affect paint events generated in
* software by the AWT, unless they are an immediate response to an
* OS-level paint message.
* <p>
* This is useful, for example, if running under full-screen mode and
* better performance is desired, or if page-flipping is used as the
* buffer strategy.
*
* @since 1.4
* @see #getIgnoreRepaint
* @see Canvas#createBufferStrategy
* @see Window#createBufferStrategy
* @see java.awt.image.BufferStrategy
* @see GraphicsDevice#setFullScreenWindow
*/
public void
setIgnoreRepaint(boolean
ignoreRepaint) {
this.
ignoreRepaint =
ignoreRepaint;
}
/**
* @return whether or not paint messages received from the operating system
* should be ignored.
*
* @since 1.4
* @see #setIgnoreRepaint
*/
public boolean
getIgnoreRepaint() {
return
ignoreRepaint;
}
/**
* Checks whether this component "contains" the specified point,
* where <code>x</code> and <code>y</code> are defined to be
* relative to the coordinate system of this component.
* @param x the <i>x</i> coordinate of the point
* @param y the <i>y</i> coordinate of the point
* @see #getComponentAt(int, int)
* @since JDK1.1
*/
public boolean
contains(int
x, int
y) {
return
inside(
x,
y);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by contains(int, int).
*/
@
Deprecated
public boolean
inside(int
x, int
y) {
return (
x >= 0) && (
x <
width) && (
y >= 0) && (
y <
height);
}
/**
* Checks whether this component "contains" the specified point,
* where the point's <i>x</i> and <i>y</i> coordinates are defined
* to be relative to the coordinate system of this component.
* @param p the point
* @throws NullPointerException if {@code p} is {@code null}
* @see #getComponentAt(Point)
* @since JDK1.1
*/
public boolean
contains(
Point p) {
return
contains(
p.
x,
p.
y);
}
/**
* Determines if this component or one of its immediate
* subcomponents contains the (<i>x</i>, <i>y</i>) location,
* and if so, returns the containing component. This method only
* looks one level deep. If the point (<i>x</i>, <i>y</i>) is
* inside a subcomponent that itself has subcomponents, it does not
* go looking down the subcomponent tree.
* <p>
* The <code>locate</code> method of <code>Component</code> simply
* returns the component itself if the (<i>x</i>, <i>y</i>)
* coordinate location is inside its bounding box, and <code>null</code>
* otherwise.
* @param x the <i>x</i> coordinate
* @param y the <i>y</i> coordinate
* @return the component or subcomponent that contains the
* (<i>x</i>, <i>y</i>) location;
* <code>null</code> if the location
* is outside this component
* @see #contains(int, int)
* @since JDK1.0
*/
public
Component getComponentAt(int
x, int
y) {
return
locate(
x,
y);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by getComponentAt(int, int).
*/
@
Deprecated
public
Component locate(int
x, int
y) {
return
contains(
x,
y) ? this : null;
}
/**
* Returns the component or subcomponent that contains the
* specified point.
* @param p the point
* @see java.awt.Component#contains
* @since JDK1.1
*/
public
Component getComponentAt(
Point p) {
return
getComponentAt(
p.
x,
p.
y);
}
/**
* @deprecated As of JDK version 1.1,
* replaced by <code>dispatchEvent(AWTEvent e)</code>.
*/
@
Deprecated
public void
deliverEvent(
Event e) {
postEvent(
e);
}
/**
* Dispatches an event to this component or one of its sub components.
* Calls <code>processEvent</code> before returning for 1.1-style
* events which have been enabled for the <code>Component</code>.
* @param e the event
*/
public final void
dispatchEvent(
AWTEvent e) {
dispatchEventImpl(
e);
}
@
SuppressWarnings("deprecation")
void
dispatchEventImpl(
AWTEvent e) {
int
id =
e.
getID();
// Check that this component belongs to this app-context
AppContext compContext =
appContext;
if (
compContext != null && !
compContext.
equals(
AppContext.
getAppContext())) {
if (
eventLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
eventLog.
fine("Event " +
e + " is being dispatched on the wrong AppContext");
}
}
if (
eventLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
eventLog.
finest("{0}",
e);
}
/*
* 0. Set timestamp and modifiers of current event.
*/
if (!(
e instanceof
KeyEvent)) {
// Timestamp of a key event is set later in DKFM.preDispatchKeyEvent(KeyEvent).
EventQueue.
setCurrentEventAndMostRecentTime(
e);
}
/*
* 1. Pre-dispatchers. Do any necessary retargeting/reordering here
* before we notify AWTEventListeners.
*/
if (
e instanceof
SunDropTargetEvent) {
((
SunDropTargetEvent)
e).
dispatch();
return;
}
if (!
e.
focusManagerIsDispatching) {
// Invoke the private focus retargeting method which provides
// lightweight Component support
if (
e.
isPosted) {
e =
KeyboardFocusManager.
retargetFocusEvent(
e);
e.
isPosted = true;
}
// Now, with the event properly targeted to a lightweight
// descendant if necessary, invoke the public focus retargeting
// and dispatching function
if (
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
dispatchEvent(
e))
{
return;
}
}
if ((
e instanceof
FocusEvent) &&
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("" +
e);
}
// MouseWheel may need to be retargeted here so that
// AWTEventListener sees the event go to the correct
// Component. If the MouseWheelEvent needs to go to an ancestor,
// the event is dispatched to the ancestor, and dispatching here
// stops.
if (
id ==
MouseEvent.
MOUSE_WHEEL &&
(!
eventTypeEnabled(
id)) &&
(
peer != null && !
peer.
handlesWheelScrolling()) &&
(
dispatchMouseWheelToAncestor((
MouseWheelEvent)
e)))
{
return;
}
/*
* 2. Allow the Toolkit to pass this to AWTEventListeners.
*/
Toolkit toolkit =
Toolkit.
getDefaultToolkit();
toolkit.
notifyAWTEventListeners(
e);
/*
* 3. If no one has consumed a key event, allow the
* KeyboardFocusManager to process it.
*/
if (!
e.
isConsumed()) {
if (
e instanceof java.awt.event.
KeyEvent) {
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
processKeyEvent(this, (
KeyEvent)
e);
if (
e.
isConsumed()) {
return;
}
}
}
/*
* 4. Allow input methods to process the event
*/
if (
areInputMethodsEnabled()) {
// We need to pass on InputMethodEvents since some host
// input method adapters send them through the Java
// event queue instead of directly to the component,
// and the input context also handles the Java composition window
if(((
e instanceof
InputMethodEvent) && !(this instanceof
CompositionArea))
||
// Otherwise, we only pass on input and focus events, because
// a) input methods shouldn't know about semantic or component-level events
// b) passing on the events takes time
// c) isConsumed() is always true for semantic events.
(
e instanceof
InputEvent) || (
e instanceof
FocusEvent)) {
InputContext inputContext =
getInputContext();
if (
inputContext != null) {
inputContext.
dispatchEvent(
e);
if (
e.
isConsumed()) {
if ((
e instanceof
FocusEvent) &&
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("3579: Skipping " +
e);
}
return;
}
}
}
} else {
// When non-clients get focus, we need to explicitly disable the native
// input method. The native input method is actually not disabled when
// the active/passive/peered clients loose focus.
if (
id ==
FocusEvent.
FOCUS_GAINED) {
InputContext inputContext =
getInputContext();
if (
inputContext != null &&
inputContext instanceof sun.awt.im.
InputContext) {
((sun.awt.im.
InputContext)
inputContext).
disableNativeIM();
}
}
}
/*
* 5. Pre-process any special events before delivery
*/
switch(
id) {
// Handling of the PAINT and UPDATE events is now done in the
// peer's handleEvent() method so the background can be cleared
// selectively for non-native components on Windows only.
// - Fred.Ecks@Eng.sun.com, 5-8-98
case
KeyEvent.
KEY_PRESSED:
case
KeyEvent.
KEY_RELEASED:
Container p = (
Container)((this instanceof
Container) ? this :
parent);
if (
p != null) {
p.
preProcessKeyEvent((
KeyEvent)
e);
if (
e.
isConsumed()) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("Pre-process consumed event");
}
return;
}
}
break;
case
WindowEvent.
WINDOW_CLOSING:
if (
toolkit instanceof
WindowClosingListener) {
windowClosingException = ((
WindowClosingListener)
toolkit).
windowClosingNotify((
WindowEvent)
e);
if (
checkWindowClosingException()) {
return;
}
}
break;
default:
break;
}
/*
* 6. Deliver event for normal processing
*/
if (
newEventsOnly) {
// Filtering needs to really be moved to happen at a lower
// level in order to get maximum performance gain; it is
// here temporarily to ensure the API spec is honored.
//
if (
eventEnabled(
e)) {
processEvent(
e);
}
} else if (
id ==
MouseEvent.
MOUSE_WHEEL) {
// newEventsOnly will be false for a listenerless ScrollPane, but
// MouseWheelEvents still need to be dispatched to it so scrolling
// can be done.
autoProcessMouseWheel((
MouseWheelEvent)
e);
} else if (!(
e instanceof
MouseEvent && !
postsOldMouseEvents())) {
//
// backward compatibility
//
Event olde =
e.
convertToOld();
if (
olde != null) {
int
key =
olde.
key;
int
modifiers =
olde.
modifiers;
postEvent(
olde);
if (
olde.
isConsumed()) {
e.
consume();
}
// if target changed key or modifier values, copy them
// back to original event
//
switch(
olde.
id) {
case
Event.
KEY_PRESS:
case
Event.
KEY_RELEASE:
case
Event.
KEY_ACTION:
case
Event.
KEY_ACTION_RELEASE:
if (
olde.
key !=
key) {
((
KeyEvent)
e).
setKeyChar(
olde.
getKeyEventChar());
}
if (
olde.
modifiers !=
modifiers) {
((
KeyEvent)
e).
setModifiers(
olde.
modifiers);
}
break;
default:
break;
}
}
}
/*
* 8. Special handling for 4061116 : Hook for browser to close modal
* dialogs.
*/
if (
id ==
WindowEvent.
WINDOW_CLOSING && !
e.
isConsumed()) {
if (
toolkit instanceof
WindowClosingListener) {
windowClosingException =
((
WindowClosingListener)
toolkit).
windowClosingDelivered((
WindowEvent)
e);
if (
checkWindowClosingException()) {
return;
}
}
}
/*
* 9. Allow the peer to process the event.
* Except KeyEvents, they will be processed by peer after
* all KeyEventPostProcessors
* (see DefaultKeyboardFocusManager.dispatchKeyEvent())
*/
if (!(
e instanceof
KeyEvent)) {
ComponentPeer tpeer =
peer;
if (
e instanceof
FocusEvent && (
tpeer == null ||
tpeer instanceof
LightweightPeer)) {
// if focus owner is lightweight then its native container
// processes event
Component source = (
Component)
e.
getSource();
if (
source != null) {
Container target =
source.
getNativeContainer();
if (
target != null) {
tpeer =
target.
getPeer();
}
}
}
if (
tpeer != null) {
tpeer.
handleEvent(
e);
}
}
if (
SunToolkit.
isTouchKeyboardAutoShowEnabled() &&
(
toolkit instanceof
SunToolkit) &&
((
e instanceof
MouseEvent) || (
e instanceof
FocusEvent))) {
((
SunToolkit)
toolkit).
showOrHideTouchKeyboard(this,
e);
}
} // dispatchEventImpl()
/*
* If newEventsOnly is false, method is called so that ScrollPane can
* override it and handle common-case mouse wheel scrolling. NOP
* for Component.
*/
void
autoProcessMouseWheel(
MouseWheelEvent e) {}
/*
* Dispatch given MouseWheelEvent to the first ancestor for which
* MouseWheelEvents are enabled.
*
* Returns whether or not event was dispatched to an ancestor
*/
boolean
dispatchMouseWheelToAncestor(
MouseWheelEvent e) {
int
newX,
newY;
newX =
e.
getX() +
getX(); // Coordinates take into account at least
newY =
e.
getY() +
getY(); // the cursor's position relative to this
// Component (e.getX()), and this Component's
// position relative to its parent.
MouseWheelEvent newMWE;
if (
eventLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
eventLog.
finest("dispatchMouseWheelToAncestor");
eventLog.
finest("orig event src is of " +
e.
getSource().
getClass());
}
/* parent field for Window refers to the owning Window.
* MouseWheelEvents should NOT be propagated into owning Windows
*/
synchronized (
getTreeLock()) {
Container anc =
getParent();
while (
anc != null && !
anc.
eventEnabled(
e)) {
// fix coordinates to be relative to new event source
newX +=
anc.
getX();
newY +=
anc.
getY();
if (!(
anc instanceof
Window)) {
anc =
anc.
getParent();
}
else {
break;
}
}
if (
eventLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
eventLog.
finest("new event src is " +
anc.
getClass());
}
if (
anc != null &&
anc.
eventEnabled(
e)) {
// Change event to be from new source, with new x,y
// For now, just create a new event - yucky
newMWE = new
MouseWheelEvent(
anc, // new source
e.
getID(),
e.
getWhen(),
e.
getModifiers(),
newX, // x relative to new source
newY, // y relative to new source
e.
getXOnScreen(),
e.
getYOnScreen(),
e.
getClickCount(),
e.
isPopupTrigger(),
e.
getScrollType(),
e.
getScrollAmount(),
e.
getWheelRotation(),
e.
getPreciseWheelRotation());
((
AWTEvent)
e).
copyPrivateDataInto(
newMWE);
// When dispatching a wheel event to
// ancestor, there is no need trying to find descendant
// lightweights to dispatch event to.
// If we dispatch the event to toplevel ancestor,
// this could encolse the loop: 6480024.
anc.
dispatchEventToSelf(
newMWE);
if (
newMWE.
isConsumed()) {
e.
consume();
}
return true;
}
}
return false;
}
boolean
checkWindowClosingException() {
if (
windowClosingException != null) {
if (this instanceof
Dialog) {
((
Dialog)this).
interruptBlocking();
} else {
windowClosingException.
fillInStackTrace();
windowClosingException.
printStackTrace();
windowClosingException = null;
}
return true;
}
return false;
}
boolean
areInputMethodsEnabled() {
// in 1.2, we assume input method support is required for all
// components that handle key events, but components can turn off
// input methods by calling enableInputMethods(false).
return ((
eventMask &
AWTEvent.
INPUT_METHODS_ENABLED_MASK) != 0) &&
((
eventMask &
AWTEvent.
KEY_EVENT_MASK) != 0 ||
keyListener != null);
}
// REMIND: remove when filtering is handled at lower level
boolean
eventEnabled(
AWTEvent e) {
return
eventTypeEnabled(
e.
id);
}
boolean
eventTypeEnabled(int
type) {
switch(
type) {
case
ComponentEvent.
COMPONENT_MOVED:
case
ComponentEvent.
COMPONENT_RESIZED:
case
ComponentEvent.
COMPONENT_SHOWN:
case
ComponentEvent.
COMPONENT_HIDDEN:
if ((
eventMask &
AWTEvent.
COMPONENT_EVENT_MASK) != 0 ||
componentListener != null) {
return true;
}
break;
case
FocusEvent.
FOCUS_GAINED:
case
FocusEvent.
FOCUS_LOST:
if ((
eventMask &
AWTEvent.
FOCUS_EVENT_MASK) != 0 ||
focusListener != null) {
return true;
}
break;
case
KeyEvent.
KEY_PRESSED:
case
KeyEvent.
KEY_RELEASED:
case
KeyEvent.
KEY_TYPED:
if ((
eventMask &
AWTEvent.
KEY_EVENT_MASK) != 0 ||
keyListener != null) {
return true;
}
break;
case
MouseEvent.
MOUSE_PRESSED:
case
MouseEvent.
MOUSE_RELEASED:
case
MouseEvent.
MOUSE_ENTERED:
case
MouseEvent.
MOUSE_EXITED:
case
MouseEvent.
MOUSE_CLICKED:
if ((
eventMask &
AWTEvent.
MOUSE_EVENT_MASK) != 0 ||
mouseListener != null) {
return true;
}
break;
case
MouseEvent.
MOUSE_MOVED:
case
MouseEvent.
MOUSE_DRAGGED:
if ((
eventMask &
AWTEvent.
MOUSE_MOTION_EVENT_MASK) != 0 ||
mouseMotionListener != null) {
return true;
}
break;
case
MouseEvent.
MOUSE_WHEEL:
if ((
eventMask &
AWTEvent.
MOUSE_WHEEL_EVENT_MASK) != 0 ||
mouseWheelListener != null) {
return true;
}
break;
case
InputMethodEvent.
INPUT_METHOD_TEXT_CHANGED:
case
InputMethodEvent.
CARET_POSITION_CHANGED:
if ((
eventMask &
AWTEvent.
INPUT_METHOD_EVENT_MASK) != 0 ||
inputMethodListener != null) {
return true;
}
break;
case
HierarchyEvent.
HIERARCHY_CHANGED:
if ((
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) != 0 ||
hierarchyListener != null) {
return true;
}
break;
case
HierarchyEvent.
ANCESTOR_MOVED:
case
HierarchyEvent.
ANCESTOR_RESIZED:
if ((
eventMask &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK) != 0 ||
hierarchyBoundsListener != null) {
return true;
}
break;
case
ActionEvent.
ACTION_PERFORMED:
if ((
eventMask &
AWTEvent.
ACTION_EVENT_MASK) != 0) {
return true;
}
break;
case
TextEvent.
TEXT_VALUE_CHANGED:
if ((
eventMask &
AWTEvent.
TEXT_EVENT_MASK) != 0) {
return true;
}
break;
case
ItemEvent.
ITEM_STATE_CHANGED:
if ((
eventMask &
AWTEvent.
ITEM_EVENT_MASK) != 0) {
return true;
}
break;
case
AdjustmentEvent.
ADJUSTMENT_VALUE_CHANGED:
if ((
eventMask &
AWTEvent.
ADJUSTMENT_EVENT_MASK) != 0) {
return true;
}
break;
default:
break;
}
//
// Always pass on events defined by external programs.
//
if (
type >
AWTEvent.
RESERVED_ID_MAX) {
return true;
}
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by dispatchEvent(AWTEvent).
*/
@
Deprecated
public boolean
postEvent(
Event e) {
ComponentPeer peer = this.
peer;
if (
handleEvent(
e)) {
e.
consume();
return true;
}
Component parent = this.
parent;
int
eventx =
e.
x;
int
eventy =
e.
y;
if (
parent != null) {
e.
translate(
x,
y);
if (
parent.
postEvent(
e)) {
e.
consume();
return true;
}
// restore coords
e.
x =
eventx;
e.
y =
eventy;
}
return false;
}
// Event source interfaces
/**
* Adds the specified component listener to receive component events from
* this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the component listener
* @see java.awt.event.ComponentEvent
* @see java.awt.event.ComponentListener
* @see #removeComponentListener
* @see #getComponentListeners
* @since JDK1.1
*/
public synchronized void
addComponentListener(
ComponentListener l) {
if (
l == null) {
return;
}
componentListener =
AWTEventMulticaster.
add(
componentListener,
l);
newEventsOnly = true;
}
/**
* Removes the specified component listener so that it no longer
* receives component events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
* @param l the component listener
* @see java.awt.event.ComponentEvent
* @see java.awt.event.ComponentListener
* @see #addComponentListener
* @see #getComponentListeners
* @since JDK1.1
*/
public synchronized void
removeComponentListener(
ComponentListener l) {
if (
l == null) {
return;
}
componentListener =
AWTEventMulticaster.
remove(
componentListener,
l);
}
/**
* Returns an array of all the component listeners
* registered on this component.
*
* @return all <code>ComponentListener</code>s of this component
* or an empty array if no component
* listeners are currently registered
*
* @see #addComponentListener
* @see #removeComponentListener
* @since 1.4
*/
public synchronized
ComponentListener[]
getComponentListeners() {
return
getListeners(
ComponentListener.class);
}
/**
* Adds the specified focus listener to receive focus events from
* this component when this component gains input focus.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the focus listener
* @see java.awt.event.FocusEvent
* @see java.awt.event.FocusListener
* @see #removeFocusListener
* @see #getFocusListeners
* @since JDK1.1
*/
public synchronized void
addFocusListener(
FocusListener l) {
if (
l == null) {
return;
}
focusListener =
AWTEventMulticaster.
add(
focusListener,
l);
newEventsOnly = true;
// if this is a lightweight component, enable focus events
// in the native container.
if (
peer instanceof
LightweightPeer) {
parent.
proxyEnableEvents(
AWTEvent.
FOCUS_EVENT_MASK);
}
}
/**
* Removes the specified focus listener so that it no longer
* receives focus events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the focus listener
* @see java.awt.event.FocusEvent
* @see java.awt.event.FocusListener
* @see #addFocusListener
* @see #getFocusListeners
* @since JDK1.1
*/
public synchronized void
removeFocusListener(
FocusListener l) {
if (
l == null) {
return;
}
focusListener =
AWTEventMulticaster.
remove(
focusListener,
l);
}
/**
* Returns an array of all the focus listeners
* registered on this component.
*
* @return all of this component's <code>FocusListener</code>s
* or an empty array if no component
* listeners are currently registered
*
* @see #addFocusListener
* @see #removeFocusListener
* @since 1.4
*/
public synchronized
FocusListener[]
getFocusListeners() {
return
getListeners(
FocusListener.class);
}
/**
* Adds the specified hierarchy listener to receive hierarchy changed
* events from this component when the hierarchy to which this container
* belongs changes.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the hierarchy listener
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyListener
* @see #removeHierarchyListener
* @see #getHierarchyListeners
* @since 1.3
*/
public void
addHierarchyListener(
HierarchyListener l) {
if (
l == null) {
return;
}
boolean
notifyAncestors;
synchronized (this) {
notifyAncestors =
(
hierarchyListener == null &&
(
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) == 0);
hierarchyListener =
AWTEventMulticaster.
add(
hierarchyListener,
l);
notifyAncestors = (
notifyAncestors &&
hierarchyListener != null);
newEventsOnly = true;
}
if (
notifyAncestors) {
synchronized (
getTreeLock()) {
adjustListeningChildrenOnParent(
AWTEvent.
HIERARCHY_EVENT_MASK,
1);
}
}
}
/**
* Removes the specified hierarchy listener so that it no longer
* receives hierarchy changed events from this component. This method
* performs no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the hierarchy listener
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyListener
* @see #addHierarchyListener
* @see #getHierarchyListeners
* @since 1.3
*/
public void
removeHierarchyListener(
HierarchyListener l) {
if (
l == null) {
return;
}
boolean
notifyAncestors;
synchronized (this) {
notifyAncestors =
(
hierarchyListener != null &&
(
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) == 0);
hierarchyListener =
AWTEventMulticaster.
remove(
hierarchyListener,
l);
notifyAncestors = (
notifyAncestors &&
hierarchyListener == null);
}
if (
notifyAncestors) {
synchronized (
getTreeLock()) {
adjustListeningChildrenOnParent(
AWTEvent.
HIERARCHY_EVENT_MASK,
-1);
}
}
}
/**
* Returns an array of all the hierarchy listeners
* registered on this component.
*
* @return all of this component's <code>HierarchyListener</code>s
* or an empty array if no hierarchy
* listeners are currently registered
*
* @see #addHierarchyListener
* @see #removeHierarchyListener
* @since 1.4
*/
public synchronized
HierarchyListener[]
getHierarchyListeners() {
return
getListeners(
HierarchyListener.class);
}
/**
* Adds the specified hierarchy bounds listener to receive hierarchy
* bounds events from this component when the hierarchy to which this
* container belongs changes.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the hierarchy bounds listener
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyBoundsListener
* @see #removeHierarchyBoundsListener
* @see #getHierarchyBoundsListeners
* @since 1.3
*/
public void
addHierarchyBoundsListener(
HierarchyBoundsListener l) {
if (
l == null) {
return;
}
boolean
notifyAncestors;
synchronized (this) {
notifyAncestors =
(
hierarchyBoundsListener == null &&
(
eventMask &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK) == 0);
hierarchyBoundsListener =
AWTEventMulticaster.
add(
hierarchyBoundsListener,
l);
notifyAncestors = (
notifyAncestors &&
hierarchyBoundsListener != null);
newEventsOnly = true;
}
if (
notifyAncestors) {
synchronized (
getTreeLock()) {
adjustListeningChildrenOnParent(
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK, 1);
}
}
}
/**
* Removes the specified hierarchy bounds listener so that it no longer
* receives hierarchy bounds events from this component. This method
* performs no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the hierarchy bounds listener
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyBoundsListener
* @see #addHierarchyBoundsListener
* @see #getHierarchyBoundsListeners
* @since 1.3
*/
public void
removeHierarchyBoundsListener(
HierarchyBoundsListener l) {
if (
l == null) {
return;
}
boolean
notifyAncestors;
synchronized (this) {
notifyAncestors =
(
hierarchyBoundsListener != null &&
(
eventMask &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK) == 0);
hierarchyBoundsListener =
AWTEventMulticaster.
remove(
hierarchyBoundsListener,
l);
notifyAncestors = (
notifyAncestors &&
hierarchyBoundsListener == null);
}
if (
notifyAncestors) {
synchronized (
getTreeLock()) {
adjustListeningChildrenOnParent(
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK, -1);
}
}
}
// Should only be called while holding the tree lock
int
numListening(long
mask) {
// One mask or the other, but not neither or both.
if (
eventLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
if ((
mask !=
AWTEvent.
HIERARCHY_EVENT_MASK) &&
(
mask !=
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK))
{
eventLog.
fine("Assertion failed");
}
}
if ((
mask ==
AWTEvent.
HIERARCHY_EVENT_MASK &&
(
hierarchyListener != null ||
(
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) != 0)) ||
(
mask ==
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK &&
(
hierarchyBoundsListener != null ||
(
eventMask &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK) != 0))) {
return 1;
} else {
return 0;
}
}
// Should only be called while holding tree lock
int
countHierarchyMembers() {
return 1;
}
// Should only be called while holding the tree lock
int
createHierarchyEvents(int
id,
Component changed,
Container changedParent, long
changeFlags,
boolean
enabledOnToolkit) {
switch (
id) {
case
HierarchyEvent.
HIERARCHY_CHANGED:
if (
hierarchyListener != null ||
(
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) != 0 ||
enabledOnToolkit) {
HierarchyEvent e = new
HierarchyEvent(this,
id,
changed,
changedParent,
changeFlags);
dispatchEvent(
e);
return 1;
}
break;
case
HierarchyEvent.
ANCESTOR_MOVED:
case
HierarchyEvent.
ANCESTOR_RESIZED:
if (
eventLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
if (
changeFlags != 0) {
eventLog.
fine("Assertion (changeFlags == 0) failed");
}
}
if (
hierarchyBoundsListener != null ||
(
eventMask &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK) != 0 ||
enabledOnToolkit) {
HierarchyEvent e = new
HierarchyEvent(this,
id,
changed,
changedParent);
dispatchEvent(
e);
return 1;
}
break;
default:
// assert false
if (
eventLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
eventLog.
fine("This code must never be reached");
}
break;
}
return 0;
}
/**
* Returns an array of all the hierarchy bounds listeners
* registered on this component.
*
* @return all of this component's <code>HierarchyBoundsListener</code>s
* or an empty array if no hierarchy bounds
* listeners are currently registered
*
* @see #addHierarchyBoundsListener
* @see #removeHierarchyBoundsListener
* @since 1.4
*/
public synchronized
HierarchyBoundsListener[]
getHierarchyBoundsListeners() {
return
getListeners(
HierarchyBoundsListener.class);
}
/*
* Should only be called while holding the tree lock.
* It's added only for overriding in java.awt.Window
* because parent in Window is owner.
*/
void
adjustListeningChildrenOnParent(long
mask, int
num) {
if (
parent != null) {
parent.
adjustListeningChildren(
mask,
num);
}
}
/**
* Adds the specified key listener to receive key events from
* this component.
* If l is null, no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the key listener.
* @see java.awt.event.KeyEvent
* @see java.awt.event.KeyListener
* @see #removeKeyListener
* @see #getKeyListeners
* @since JDK1.1
*/
public synchronized void
addKeyListener(
KeyListener l) {
if (
l == null) {
return;
}
keyListener =
AWTEventMulticaster.
add(
keyListener,
l);
newEventsOnly = true;
// if this is a lightweight component, enable key events
// in the native container.
if (
peer instanceof
LightweightPeer) {
parent.
proxyEnableEvents(
AWTEvent.
KEY_EVENT_MASK);
}
}
/**
* Removes the specified key listener so that it no longer
* receives key events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the key listener
* @see java.awt.event.KeyEvent
* @see java.awt.event.KeyListener
* @see #addKeyListener
* @see #getKeyListeners
* @since JDK1.1
*/
public synchronized void
removeKeyListener(
KeyListener l) {
if (
l == null) {
return;
}
keyListener =
AWTEventMulticaster.
remove(
keyListener,
l);
}
/**
* Returns an array of all the key listeners
* registered on this component.
*
* @return all of this component's <code>KeyListener</code>s
* or an empty array if no key
* listeners are currently registered
*
* @see #addKeyListener
* @see #removeKeyListener
* @since 1.4
*/
public synchronized
KeyListener[]
getKeyListeners() {
return
getListeners(
KeyListener.class);
}
/**
* Adds the specified mouse listener to receive mouse events from
* this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse listener
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseListener
* @see #removeMouseListener
* @see #getMouseListeners
* @since JDK1.1
*/
public synchronized void
addMouseListener(
MouseListener l) {
if (
l == null) {
return;
}
mouseListener =
AWTEventMulticaster.
add(
mouseListener,
l);
newEventsOnly = true;
// if this is a lightweight component, enable mouse events
// in the native container.
if (
peer instanceof
LightweightPeer) {
parent.
proxyEnableEvents(
AWTEvent.
MOUSE_EVENT_MASK);
}
}
/**
* Removes the specified mouse listener so that it no longer
* receives mouse events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse listener
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseListener
* @see #addMouseListener
* @see #getMouseListeners
* @since JDK1.1
*/
public synchronized void
removeMouseListener(
MouseListener l) {
if (
l == null) {
return;
}
mouseListener =
AWTEventMulticaster.
remove(
mouseListener,
l);
}
/**
* Returns an array of all the mouse listeners
* registered on this component.
*
* @return all of this component's <code>MouseListener</code>s
* or an empty array if no mouse
* listeners are currently registered
*
* @see #addMouseListener
* @see #removeMouseListener
* @since 1.4
*/
public synchronized
MouseListener[]
getMouseListeners() {
return
getListeners(
MouseListener.class);
}
/**
* Adds the specified mouse motion listener to receive mouse motion
* events from this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse motion listener
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseMotionListener
* @see #removeMouseMotionListener
* @see #getMouseMotionListeners
* @since JDK1.1
*/
public synchronized void
addMouseMotionListener(
MouseMotionListener l) {
if (
l == null) {
return;
}
mouseMotionListener =
AWTEventMulticaster.
add(
mouseMotionListener,
l);
newEventsOnly = true;
// if this is a lightweight component, enable mouse events
// in the native container.
if (
peer instanceof
LightweightPeer) {
parent.
proxyEnableEvents(
AWTEvent.
MOUSE_MOTION_EVENT_MASK);
}
}
/**
* Removes the specified mouse motion listener so that it no longer
* receives mouse motion events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse motion listener
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseMotionListener
* @see #addMouseMotionListener
* @see #getMouseMotionListeners
* @since JDK1.1
*/
public synchronized void
removeMouseMotionListener(
MouseMotionListener l) {
if (
l == null) {
return;
}
mouseMotionListener =
AWTEventMulticaster.
remove(
mouseMotionListener,
l);
}
/**
* Returns an array of all the mouse motion listeners
* registered on this component.
*
* @return all of this component's <code>MouseMotionListener</code>s
* or an empty array if no mouse motion
* listeners are currently registered
*
* @see #addMouseMotionListener
* @see #removeMouseMotionListener
* @since 1.4
*/
public synchronized
MouseMotionListener[]
getMouseMotionListeners() {
return
getListeners(
MouseMotionListener.class);
}
/**
* Adds the specified mouse wheel listener to receive mouse wheel events
* from this component. Containers also receive mouse wheel events from
* sub-components.
* <p>
* For information on how mouse wheel events are dispatched, see
* the class description for {@link MouseWheelEvent}.
* <p>
* If l is <code>null</code>, no exception is thrown and no
* action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse wheel listener
* @see java.awt.event.MouseWheelEvent
* @see java.awt.event.MouseWheelListener
* @see #removeMouseWheelListener
* @see #getMouseWheelListeners
* @since 1.4
*/
public synchronized void
addMouseWheelListener(
MouseWheelListener l) {
if (
l == null) {
return;
}
mouseWheelListener =
AWTEventMulticaster.
add(
mouseWheelListener,
l);
newEventsOnly = true;
// if this is a lightweight component, enable mouse events
// in the native container.
if (
peer instanceof
LightweightPeer) {
parent.
proxyEnableEvents(
AWTEvent.
MOUSE_WHEEL_EVENT_MASK);
}
}
/**
* Removes the specified mouse wheel listener so that it no longer
* receives mouse wheel events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If l is null, no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the mouse wheel listener.
* @see java.awt.event.MouseWheelEvent
* @see java.awt.event.MouseWheelListener
* @see #addMouseWheelListener
* @see #getMouseWheelListeners
* @since 1.4
*/
public synchronized void
removeMouseWheelListener(
MouseWheelListener l) {
if (
l == null) {
return;
}
mouseWheelListener =
AWTEventMulticaster.
remove(
mouseWheelListener,
l);
}
/**
* Returns an array of all the mouse wheel listeners
* registered on this component.
*
* @return all of this component's <code>MouseWheelListener</code>s
* or an empty array if no mouse wheel
* listeners are currently registered
*
* @see #addMouseWheelListener
* @see #removeMouseWheelListener
* @since 1.4
*/
public synchronized
MouseWheelListener[]
getMouseWheelListeners() {
return
getListeners(
MouseWheelListener.class);
}
/**
* Adds the specified input method listener to receive
* input method events from this component. A component will
* only receive input method events from input methods
* if it also overrides <code>getInputMethodRequests</code> to return an
* <code>InputMethodRequests</code> instance.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="{@docRoot}/java/awt/doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the input method listener
* @see java.awt.event.InputMethodEvent
* @see java.awt.event.InputMethodListener
* @see #removeInputMethodListener
* @see #getInputMethodListeners
* @see #getInputMethodRequests
* @since 1.2
*/
public synchronized void
addInputMethodListener(
InputMethodListener l) {
if (
l == null) {
return;
}
inputMethodListener =
AWTEventMulticaster.
add(
inputMethodListener,
l);
newEventsOnly = true;
}
/**
* Removes the specified input method listener so that it no longer
* receives input method events from this component. This method performs
* no function, nor does it throw an exception, if the listener
* specified by the argument was not previously added to this component.
* If listener <code>l</code> is <code>null</code>,
* no exception is thrown and no action is performed.
* <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
* >AWT Threading Issues</a> for details on AWT's threading model.
*
* @param l the input method listener
* @see java.awt.event.InputMethodEvent
* @see java.awt.event.InputMethodListener
* @see #addInputMethodListener
* @see #getInputMethodListeners
* @since 1.2
*/
public synchronized void
removeInputMethodListener(
InputMethodListener l) {
if (
l == null) {
return;
}
inputMethodListener =
AWTEventMulticaster.
remove(
inputMethodListener,
l);
}
/**
* Returns an array of all the input method listeners
* registered on this component.
*
* @return all of this component's <code>InputMethodListener</code>s
* or an empty array if no input method
* listeners are currently registered
*
* @see #addInputMethodListener
* @see #removeInputMethodListener
* @since 1.4
*/
public synchronized
InputMethodListener[]
getInputMethodListeners() {
return
getListeners(
InputMethodListener.class);
}
/**
* Returns an array of all the objects currently registered
* as <code><em>Foo</em>Listener</code>s
* upon this <code>Component</code>.
* <code><em>Foo</em>Listener</code>s are registered using the
* <code>add<em>Foo</em>Listener</code> method.
*
* <p>
* You can specify the <code>listenerType</code> argument
* with a class literal, such as
* <code><em>Foo</em>Listener.class</code>.
* For example, you can query a
* <code>Component</code> <code>c</code>
* for its mouse listeners with the following code:
*
* <pre>MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));</pre>
*
* If no such listeners exist, this method returns an empty array.
*
* @param listenerType the type of listeners requested; this parameter
* should specify an interface that descends from
* <code>java.util.EventListener</code>
* @return an array of all objects registered as
* <code><em>Foo</em>Listener</code>s on this component,
* or an empty array if no such listeners have been added
* @exception ClassCastException if <code>listenerType</code>
* doesn't specify a class or interface that implements
* <code>java.util.EventListener</code>
* @throws NullPointerException if {@code listenerType} is {@code null}
* @see #getComponentListeners
* @see #getFocusListeners
* @see #getHierarchyListeners
* @see #getHierarchyBoundsListeners
* @see #getKeyListeners
* @see #getMouseListeners
* @see #getMouseMotionListeners
* @see #getMouseWheelListeners
* @see #getInputMethodListeners
* @see #getPropertyChangeListeners
*
* @since 1.3
*/
@
SuppressWarnings("unchecked")
public <T extends
EventListener> T[]
getListeners(
Class<T>
listenerType) {
EventListener l = null;
if (
listenerType ==
ComponentListener.class) {
l =
componentListener;
} else if (
listenerType ==
FocusListener.class) {
l =
focusListener;
} else if (
listenerType ==
HierarchyListener.class) {
l =
hierarchyListener;
} else if (
listenerType ==
HierarchyBoundsListener.class) {
l =
hierarchyBoundsListener;
} else if (
listenerType ==
KeyListener.class) {
l =
keyListener;
} else if (
listenerType ==
MouseListener.class) {
l =
mouseListener;
} else if (
listenerType ==
MouseMotionListener.class) {
l =
mouseMotionListener;
} else if (
listenerType ==
MouseWheelListener.class) {
l =
mouseWheelListener;
} else if (
listenerType ==
InputMethodListener.class) {
l =
inputMethodListener;
} else if (
listenerType ==
PropertyChangeListener.class) {
return (T[])
getPropertyChangeListeners();
}
return
AWTEventMulticaster.
getListeners(
l,
listenerType);
}
/**
* Gets the input method request handler which supports
* requests from input methods for this component. A component
* that supports on-the-spot text input must override this
* method to return an <code>InputMethodRequests</code> instance.
* At the same time, it also has to handle input method events.
*
* @return the input method request handler for this component,
* <code>null</code> by default
* @see #addInputMethodListener
* @since 1.2
*/
public
InputMethodRequests getInputMethodRequests() {
return null;
}
/**
* Gets the input context used by this component for handling
* the communication with input methods when text is entered
* in this component. By default, the input context used for
* the parent component is returned. Components may
* override this to return a private input context.
*
* @return the input context used by this component;
* <code>null</code> if no context can be determined
* @since 1.2
*/
public
InputContext getInputContext() {
Container parent = this.
parent;
if (
parent == null) {
return null;
} else {
return
parent.
getInputContext();
}
}
/**
* Enables the events defined by the specified event mask parameter
* to be delivered to this component.
* <p>
* Event types are automatically enabled when a listener for
* that event type is added to the component.
* <p>
* This method only needs to be invoked by subclasses of
* <code>Component</code> which desire to have the specified event
* types delivered to <code>processEvent</code> regardless of whether
* or not a listener is registered.
* @param eventsToEnable the event mask defining the event types
* @see #processEvent
* @see #disableEvents
* @see AWTEvent
* @since JDK1.1
*/
protected final void
enableEvents(long
eventsToEnable) {
long
notifyAncestors = 0;
synchronized (this) {
if ((
eventsToEnable &
AWTEvent.
HIERARCHY_EVENT_MASK) != 0 &&
hierarchyListener == null &&
(
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) == 0) {
notifyAncestors |=
AWTEvent.
HIERARCHY_EVENT_MASK;
}
if ((
eventsToEnable &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
hierarchyBoundsListener == null &&
(
eventMask &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK) == 0) {
notifyAncestors |=
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK;
}
eventMask |=
eventsToEnable;
newEventsOnly = true;
}
// if this is a lightweight component, enable mouse events
// in the native container.
if (
peer instanceof
LightweightPeer) {
parent.
proxyEnableEvents(
eventMask);
}
if (
notifyAncestors != 0) {
synchronized (
getTreeLock()) {
adjustListeningChildrenOnParent(
notifyAncestors, 1);
}
}
}
/**
* Disables the events defined by the specified event mask parameter
* from being delivered to this component.
* @param eventsToDisable the event mask defining the event types
* @see #enableEvents
* @since JDK1.1
*/
protected final void
disableEvents(long
eventsToDisable) {
long
notifyAncestors = 0;
synchronized (this) {
if ((
eventsToDisable &
AWTEvent.
HIERARCHY_EVENT_MASK) != 0 &&
hierarchyListener == null &&
(
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) != 0) {
notifyAncestors |=
AWTEvent.
HIERARCHY_EVENT_MASK;
}
if ((
eventsToDisable &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK)!=0 &&
hierarchyBoundsListener == null &&
(
eventMask &
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK) != 0) {
notifyAncestors |=
AWTEvent.
HIERARCHY_BOUNDS_EVENT_MASK;
}
eventMask &= ~
eventsToDisable;
}
if (
notifyAncestors != 0) {
synchronized (
getTreeLock()) {
adjustListeningChildrenOnParent(
notifyAncestors, -1);
}
}
}
transient sun.awt.
EventQueueItem[]
eventCache;
/**
* @see #isCoalescingEnabled
* @see #checkCoalescing
*/
transient private boolean
coalescingEnabled =
checkCoalescing();
/**
* Weak map of known coalesceEvent overriders.
* Value indicates whether overriden.
* Bootstrap classes are not included.
*/
private static final
Map<
Class<?>,
Boolean>
coalesceMap =
new java.util.
WeakHashMap<
Class<?>,
Boolean>();
/**
* Indicates whether this class overrides coalesceEvents.
* It is assumed that all classes that are loaded from the bootstrap
* do not.
* The boostrap class loader is assumed to be represented by null.
* We do not check that the method really overrides
* (it might be static, private or package private).
*/
private boolean
checkCoalescing() {
if (
getClass().
getClassLoader()==null) {
return false;
}
final
Class<? extends
Component>
clazz =
getClass();
synchronized (
coalesceMap) {
// Check cache.
Boolean value =
coalesceMap.
get(
clazz);
if (
value != null) {
return
value;
}
// Need to check non-bootstraps.
Boolean enabled = java.security.
AccessController.
doPrivileged(
new java.security.
PrivilegedAction<
Boolean>() {
public
Boolean run() {
return
isCoalesceEventsOverriden(
clazz);
}
}
);
coalesceMap.
put(
clazz,
enabled);
return
enabled;
}
}
/**
* Parameter types of coalesceEvents(AWTEvent,AWTEVent).
*/
private static final
Class[]
coalesceEventsParams = {
AWTEvent.class,
AWTEvent.class
};
/**
* Indicates whether a class or its superclasses override coalesceEvents.
* Must be called with lock on coalesceMap and privileged.
* @see checkCoalescing
*/
private static boolean
isCoalesceEventsOverriden(
Class<?>
clazz) {
assert
Thread.
holdsLock(
coalesceMap);
// First check superclass - we may not need to bother ourselves.
Class<?>
superclass =
clazz.
getSuperclass();
if (
superclass == null) {
// Only occurs on implementations that
// do not use null to represent the bootsrap class loader.
return false;
}
if (
superclass.
getClassLoader() != null) {
Boolean value =
coalesceMap.
get(
superclass);
if (
value == null) {
// Not done already - recurse.
if (
isCoalesceEventsOverriden(
superclass)) {
coalesceMap.
put(
superclass, true);
return true;
}
} else if (
value) {
return true;
}
}
try {
// Throws if not overriden.
clazz.
getDeclaredMethod(
"coalesceEvents",
coalesceEventsParams
);
return true;
} catch (
NoSuchMethodException e) {
// Not present in this class.
return false;
}
}
/**
* Indicates whether coalesceEvents may do something.
*/
final boolean
isCoalescingEnabled() {
return
coalescingEnabled;
}
/**
* Potentially coalesce an event being posted with an existing
* event. This method is called by <code>EventQueue.postEvent</code>
* if an event with the same ID as the event to be posted is found in
* the queue (both events must have this component as their source).
* This method either returns a coalesced event which replaces
* the existing event (and the new event is then discarded), or
* <code>null</code> to indicate that no combining should be done
* (add the second event to the end of the queue). Either event
* parameter may be modified and returned, as the other one is discarded
* unless <code>null</code> is returned.
* <p>
* This implementation of <code>coalesceEvents</code> coalesces
* two event types: mouse move (and drag) events,
* and paint (and update) events.
* For mouse move events the last event is always returned, causing
* intermediate moves to be discarded. For paint events, the new
* event is coalesced into a complex <code>RepaintArea</code> in the peer.
* The new <code>AWTEvent</code> is always returned.
*
* @param existingEvent the event already on the <code>EventQueue</code>
* @param newEvent the event being posted to the
* <code>EventQueue</code>
* @return a coalesced event, or <code>null</code> indicating that no
* coalescing was done
*/
protected
AWTEvent coalesceEvents(
AWTEvent existingEvent,
AWTEvent newEvent) {
return null;
}
/**
* Processes events occurring on this component. By default this
* method calls the appropriate
* <code>process<event type>Event</code>
* method for the given class of event.
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the event
* @see #processComponentEvent
* @see #processFocusEvent
* @see #processKeyEvent
* @see #processMouseEvent
* @see #processMouseMotionEvent
* @see #processInputMethodEvent
* @see #processHierarchyEvent
* @see #processMouseWheelEvent
* @since JDK1.1
*/
protected void
processEvent(
AWTEvent e) {
if (
e instanceof
FocusEvent) {
processFocusEvent((
FocusEvent)
e);
} else if (
e instanceof
MouseEvent) {
switch(
e.
getID()) {
case
MouseEvent.
MOUSE_PRESSED:
case
MouseEvent.
MOUSE_RELEASED:
case
MouseEvent.
MOUSE_CLICKED:
case
MouseEvent.
MOUSE_ENTERED:
case
MouseEvent.
MOUSE_EXITED:
processMouseEvent((
MouseEvent)
e);
break;
case
MouseEvent.
MOUSE_MOVED:
case
MouseEvent.
MOUSE_DRAGGED:
processMouseMotionEvent((
MouseEvent)
e);
break;
case
MouseEvent.
MOUSE_WHEEL:
processMouseWheelEvent((
MouseWheelEvent)
e);
break;
}
} else if (
e instanceof
KeyEvent) {
processKeyEvent((
KeyEvent)
e);
} else if (
e instanceof
ComponentEvent) {
processComponentEvent((
ComponentEvent)
e);
} else if (
e instanceof
InputMethodEvent) {
processInputMethodEvent((
InputMethodEvent)
e);
} else if (
e instanceof
HierarchyEvent) {
switch (
e.
getID()) {
case
HierarchyEvent.
HIERARCHY_CHANGED:
processHierarchyEvent((
HierarchyEvent)
e);
break;
case
HierarchyEvent.
ANCESTOR_MOVED:
case
HierarchyEvent.
ANCESTOR_RESIZED:
processHierarchyBoundsEvent((
HierarchyEvent)
e);
break;
}
}
}
/**
* Processes component events occurring on this component by
* dispatching them to any registered
* <code>ComponentListener</code> objects.
* <p>
* This method is not called unless component events are
* enabled for this component. Component events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>ComponentListener</code> object is registered
* via <code>addComponentListener</code>.
* <li>Component events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the component event
* @see java.awt.event.ComponentEvent
* @see java.awt.event.ComponentListener
* @see #addComponentListener
* @see #enableEvents
* @since JDK1.1
*/
protected void
processComponentEvent(
ComponentEvent e) {
ComponentListener listener =
componentListener;
if (
listener != null) {
int
id =
e.
getID();
switch(
id) {
case
ComponentEvent.
COMPONENT_RESIZED:
listener.
componentResized(
e);
break;
case
ComponentEvent.
COMPONENT_MOVED:
listener.
componentMoved(
e);
break;
case
ComponentEvent.
COMPONENT_SHOWN:
listener.
componentShown(
e);
break;
case
ComponentEvent.
COMPONENT_HIDDEN:
listener.
componentHidden(
e);
break;
}
}
}
/**
* Processes focus events occurring on this component by
* dispatching them to any registered
* <code>FocusListener</code> objects.
* <p>
* This method is not called unless focus events are
* enabled for this component. Focus events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>FocusListener</code> object is registered
* via <code>addFocusListener</code>.
* <li>Focus events are enabled via <code>enableEvents</code>.
* </ul>
* <p>
* If focus events are enabled for a <code>Component</code>,
* the current <code>KeyboardFocusManager</code> determines
* whether or not a focus event should be dispatched to
* registered <code>FocusListener</code> objects. If the
* events are to be dispatched, the <code>KeyboardFocusManager</code>
* calls the <code>Component</code>'s <code>dispatchEvent</code>
* method, which results in a call to the <code>Component</code>'s
* <code>processFocusEvent</code> method.
* <p>
* If focus events are enabled for a <code>Component</code>, calling
* the <code>Component</code>'s <code>dispatchEvent</code> method
* with a <code>FocusEvent</code> as the argument will result in a
* call to the <code>Component</code>'s <code>processFocusEvent</code>
* method regardless of the current <code>KeyboardFocusManager</code>.
*
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the focus event
* @see java.awt.event.FocusEvent
* @see java.awt.event.FocusListener
* @see java.awt.KeyboardFocusManager
* @see #addFocusListener
* @see #enableEvents
* @see #dispatchEvent
* @since JDK1.1
*/
protected void
processFocusEvent(
FocusEvent e) {
FocusListener listener =
focusListener;
if (
listener != null) {
int
id =
e.
getID();
switch(
id) {
case
FocusEvent.
FOCUS_GAINED:
listener.
focusGained(
e);
break;
case
FocusEvent.
FOCUS_LOST:
listener.
focusLost(
e);
break;
}
}
}
/**
* Processes key events occurring on this component by
* dispatching them to any registered
* <code>KeyListener</code> objects.
* <p>
* This method is not called unless key events are
* enabled for this component. Key events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>KeyListener</code> object is registered
* via <code>addKeyListener</code>.
* <li>Key events are enabled via <code>enableEvents</code>.
* </ul>
*
* <p>
* If key events are enabled for a <code>Component</code>,
* the current <code>KeyboardFocusManager</code> determines
* whether or not a key event should be dispatched to
* registered <code>KeyListener</code> objects. The
* <code>DefaultKeyboardFocusManager</code> will not dispatch
* key events to a <code>Component</code> that is not the focus
* owner or is not showing.
* <p>
* As of J2SE 1.4, <code>KeyEvent</code>s are redirected to
* the focus owner. Please see the
* <a href="doc-files/FocusSpec.html">Focus Specification</a>
* for further information.
* <p>
* Calling a <code>Component</code>'s <code>dispatchEvent</code>
* method with a <code>KeyEvent</code> as the argument will
* result in a call to the <code>Component</code>'s
* <code>processKeyEvent</code> method regardless of the
* current <code>KeyboardFocusManager</code> as long as the
* component is showing, focused, and enabled, and key events
* are enabled on it.
* <p>If the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the key event
* @see java.awt.event.KeyEvent
* @see java.awt.event.KeyListener
* @see java.awt.KeyboardFocusManager
* @see java.awt.DefaultKeyboardFocusManager
* @see #processEvent
* @see #dispatchEvent
* @see #addKeyListener
* @see #enableEvents
* @see #isShowing
* @since JDK1.1
*/
protected void
processKeyEvent(
KeyEvent e) {
KeyListener listener =
keyListener;
if (
listener != null) {
int
id =
e.
getID();
switch(
id) {
case
KeyEvent.
KEY_TYPED:
listener.
keyTyped(
e);
break;
case
KeyEvent.
KEY_PRESSED:
listener.
keyPressed(
e);
break;
case
KeyEvent.
KEY_RELEASED:
listener.
keyReleased(
e);
break;
}
}
}
/**
* Processes mouse events occurring on this component by
* dispatching them to any registered
* <code>MouseListener</code> objects.
* <p>
* This method is not called unless mouse events are
* enabled for this component. Mouse events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>MouseListener</code> object is registered
* via <code>addMouseListener</code>.
* <li>Mouse events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the mouse event
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseListener
* @see #addMouseListener
* @see #enableEvents
* @since JDK1.1
*/
protected void
processMouseEvent(
MouseEvent e) {
MouseListener listener =
mouseListener;
if (
listener != null) {
int
id =
e.
getID();
switch(
id) {
case
MouseEvent.
MOUSE_PRESSED:
listener.
mousePressed(
e);
break;
case
MouseEvent.
MOUSE_RELEASED:
listener.
mouseReleased(
e);
break;
case
MouseEvent.
MOUSE_CLICKED:
listener.
mouseClicked(
e);
break;
case
MouseEvent.
MOUSE_EXITED:
listener.
mouseExited(
e);
break;
case
MouseEvent.
MOUSE_ENTERED:
listener.
mouseEntered(
e);
break;
}
}
}
/**
* Processes mouse motion events occurring on this component by
* dispatching them to any registered
* <code>MouseMotionListener</code> objects.
* <p>
* This method is not called unless mouse motion events are
* enabled for this component. Mouse motion events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>MouseMotionListener</code> object is registered
* via <code>addMouseMotionListener</code>.
* <li>Mouse motion events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the mouse motion event
* @see java.awt.event.MouseEvent
* @see java.awt.event.MouseMotionListener
* @see #addMouseMotionListener
* @see #enableEvents
* @since JDK1.1
*/
protected void
processMouseMotionEvent(
MouseEvent e) {
MouseMotionListener listener =
mouseMotionListener;
if (
listener != null) {
int
id =
e.
getID();
switch(
id) {
case
MouseEvent.
MOUSE_MOVED:
listener.
mouseMoved(
e);
break;
case
MouseEvent.
MOUSE_DRAGGED:
listener.
mouseDragged(
e);
break;
}
}
}
/**
* Processes mouse wheel events occurring on this component by
* dispatching them to any registered
* <code>MouseWheelListener</code> objects.
* <p>
* This method is not called unless mouse wheel events are
* enabled for this component. Mouse wheel events are enabled
* when one of the following occurs:
* <ul>
* <li>A <code>MouseWheelListener</code> object is registered
* via <code>addMouseWheelListener</code>.
* <li>Mouse wheel events are enabled via <code>enableEvents</code>.
* </ul>
* <p>
* For information on how mouse wheel events are dispatched, see
* the class description for {@link MouseWheelEvent}.
* <p>
* Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the mouse wheel event
* @see java.awt.event.MouseWheelEvent
* @see java.awt.event.MouseWheelListener
* @see #addMouseWheelListener
* @see #enableEvents
* @since 1.4
*/
protected void
processMouseWheelEvent(
MouseWheelEvent e) {
MouseWheelListener listener =
mouseWheelListener;
if (
listener != null) {
int
id =
e.
getID();
switch(
id) {
case
MouseEvent.
MOUSE_WHEEL:
listener.
mouseWheelMoved(
e);
break;
}
}
}
boolean
postsOldMouseEvents() {
return false;
}
/**
* Processes input method events occurring on this component by
* dispatching them to any registered
* <code>InputMethodListener</code> objects.
* <p>
* This method is not called unless input method events
* are enabled for this component. Input method events are enabled
* when one of the following occurs:
* <ul>
* <li>An <code>InputMethodListener</code> object is registered
* via <code>addInputMethodListener</code>.
* <li>Input method events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the input method event
* @see java.awt.event.InputMethodEvent
* @see java.awt.event.InputMethodListener
* @see #addInputMethodListener
* @see #enableEvents
* @since 1.2
*/
protected void
processInputMethodEvent(
InputMethodEvent e) {
InputMethodListener listener =
inputMethodListener;
if (
listener != null) {
int
id =
e.
getID();
switch (
id) {
case
InputMethodEvent.
INPUT_METHOD_TEXT_CHANGED:
listener.
inputMethodTextChanged(
e);
break;
case
InputMethodEvent.
CARET_POSITION_CHANGED:
listener.
caretPositionChanged(
e);
break;
}
}
}
/**
* Processes hierarchy events occurring on this component by
* dispatching them to any registered
* <code>HierarchyListener</code> objects.
* <p>
* This method is not called unless hierarchy events
* are enabled for this component. Hierarchy events are enabled
* when one of the following occurs:
* <ul>
* <li>An <code>HierarchyListener</code> object is registered
* via <code>addHierarchyListener</code>.
* <li>Hierarchy events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the hierarchy event
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyListener
* @see #addHierarchyListener
* @see #enableEvents
* @since 1.3
*/
protected void
processHierarchyEvent(
HierarchyEvent e) {
HierarchyListener listener =
hierarchyListener;
if (
listener != null) {
int
id =
e.
getID();
switch (
id) {
case
HierarchyEvent.
HIERARCHY_CHANGED:
listener.
hierarchyChanged(
e);
break;
}
}
}
/**
* Processes hierarchy bounds events occurring on this component by
* dispatching them to any registered
* <code>HierarchyBoundsListener</code> objects.
* <p>
* This method is not called unless hierarchy bounds events
* are enabled for this component. Hierarchy bounds events are enabled
* when one of the following occurs:
* <ul>
* <li>An <code>HierarchyBoundsListener</code> object is registered
* via <code>addHierarchyBoundsListener</code>.
* <li>Hierarchy bounds events are enabled via <code>enableEvents</code>.
* </ul>
* <p>Note that if the event parameter is <code>null</code>
* the behavior is unspecified and may result in an
* exception.
*
* @param e the hierarchy event
* @see java.awt.event.HierarchyEvent
* @see java.awt.event.HierarchyBoundsListener
* @see #addHierarchyBoundsListener
* @see #enableEvents
* @since 1.3
*/
protected void
processHierarchyBoundsEvent(
HierarchyEvent e) {
HierarchyBoundsListener listener =
hierarchyBoundsListener;
if (
listener != null) {
int
id =
e.
getID();
switch (
id) {
case
HierarchyEvent.
ANCESTOR_MOVED:
listener.
ancestorMoved(
e);
break;
case
HierarchyEvent.
ANCESTOR_RESIZED:
listener.
ancestorResized(
e);
break;
}
}
}
/**
* @deprecated As of JDK version 1.1
* replaced by processEvent(AWTEvent).
*/
@
Deprecated
public boolean
handleEvent(
Event evt) {
switch (
evt.
id) {
case
Event.
MOUSE_ENTER:
return
mouseEnter(
evt,
evt.
x,
evt.
y);
case
Event.
MOUSE_EXIT:
return
mouseExit(
evt,
evt.
x,
evt.
y);
case
Event.
MOUSE_MOVE:
return
mouseMove(
evt,
evt.
x,
evt.
y);
case
Event.
MOUSE_DOWN:
return
mouseDown(
evt,
evt.
x,
evt.
y);
case
Event.
MOUSE_DRAG:
return
mouseDrag(
evt,
evt.
x,
evt.
y);
case
Event.
MOUSE_UP:
return
mouseUp(
evt,
evt.
x,
evt.
y);
case
Event.
KEY_PRESS:
case
Event.
KEY_ACTION:
return
keyDown(
evt,
evt.
key);
case
Event.
KEY_RELEASE:
case
Event.
KEY_ACTION_RELEASE:
return
keyUp(
evt,
evt.
key);
case
Event.
ACTION_EVENT:
return
action(
evt,
evt.
arg);
case
Event.
GOT_FOCUS:
return
gotFocus(
evt,
evt.
arg);
case
Event.
LOST_FOCUS:
return
lostFocus(
evt,
evt.
arg);
}
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseEvent(MouseEvent).
*/
@
Deprecated
public boolean
mouseDown(
Event evt, int
x, int
y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseMotionEvent(MouseEvent).
*/
@
Deprecated
public boolean
mouseDrag(
Event evt, int
x, int
y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseEvent(MouseEvent).
*/
@
Deprecated
public boolean
mouseUp(
Event evt, int
x, int
y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseMotionEvent(MouseEvent).
*/
@
Deprecated
public boolean
mouseMove(
Event evt, int
x, int
y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseEvent(MouseEvent).
*/
@
Deprecated
public boolean
mouseEnter(
Event evt, int
x, int
y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processMouseEvent(MouseEvent).
*/
@
Deprecated
public boolean
mouseExit(
Event evt, int
x, int
y) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processKeyEvent(KeyEvent).
*/
@
Deprecated
public boolean
keyDown(
Event evt, int
key) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processKeyEvent(KeyEvent).
*/
@
Deprecated
public boolean
keyUp(
Event evt, int
key) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* should register this component as ActionListener on component
* which fires action events.
*/
@
Deprecated
public boolean
action(
Event evt,
Object what) {
return false;
}
/**
* Makes this <code>Component</code> displayable by connecting it to a
* native screen resource.
* This method is called internally by the toolkit and should
* not be called directly by programs.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
* @see #isDisplayable
* @see #removeNotify
* @see #invalidate
* @since JDK1.0
*/
public void
addNotify() {
synchronized (
getTreeLock()) {
ComponentPeer peer = this.
peer;
if (
peer == null ||
peer instanceof
LightweightPeer){
if (
peer == null) {
// Update both the Component's peer variable and the local
// variable we use for thread safety.
this.
peer =
peer =
getToolkit().
createComponent(this);
}
// This is a lightweight component which means it won't be
// able to get window-related events by itself. If any
// have been enabled, then the nearest native container must
// be enabled.
if (
parent != null) {
long
mask = 0;
if ((
mouseListener != null) || ((
eventMask &
AWTEvent.
MOUSE_EVENT_MASK) != 0)) {
mask |=
AWTEvent.
MOUSE_EVENT_MASK;
}
if ((
mouseMotionListener != null) ||
((
eventMask &
AWTEvent.
MOUSE_MOTION_EVENT_MASK) != 0)) {
mask |=
AWTEvent.
MOUSE_MOTION_EVENT_MASK;
}
if ((
mouseWheelListener != null ) ||
((
eventMask &
AWTEvent.
MOUSE_WHEEL_EVENT_MASK) != 0)) {
mask |=
AWTEvent.
MOUSE_WHEEL_EVENT_MASK;
}
if (
focusListener != null || (
eventMask &
AWTEvent.
FOCUS_EVENT_MASK) != 0) {
mask |=
AWTEvent.
FOCUS_EVENT_MASK;
}
if (
keyListener != null || (
eventMask &
AWTEvent.
KEY_EVENT_MASK) != 0) {
mask |=
AWTEvent.
KEY_EVENT_MASK;
}
if (
mask != 0) {
parent.
proxyEnableEvents(
mask);
}
}
} else {
// It's native. If the parent is lightweight it will need some
// help.
Container parent =
getContainer();
if (
parent != null &&
parent.
isLightweight()) {
relocateComponent();
if (!
parent.
isRecursivelyVisibleUpToHeavyweightContainer())
{
peer.
setVisible(false);
}
}
}
invalidate();
int
npopups = (
popups != null?
popups.
size() : 0);
for (int
i = 0 ;
i <
npopups ;
i++) {
PopupMenu popup =
popups.
elementAt(
i);
popup.
addNotify();
}
if (
dropTarget != null)
dropTarget.
addNotify(
peer);
peerFont =
getFont();
if (
getContainer() != null && !
isAddNotifyComplete) {
getContainer().
increaseComponentCount(this);
}
// Update stacking order
updateZOrder();
if (!
isAddNotifyComplete) {
mixOnShowing();
}
isAddNotifyComplete = true;
if (
hierarchyListener != null ||
(
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) != 0 ||
Toolkit.
enabledOnToolkit(
AWTEvent.
HIERARCHY_EVENT_MASK)) {
HierarchyEvent e =
new
HierarchyEvent(this,
HierarchyEvent.
HIERARCHY_CHANGED,
this,
parent,
HierarchyEvent.
DISPLAYABILITY_CHANGED |
((
isRecursivelyVisible())
?
HierarchyEvent.
SHOWING_CHANGED
: 0));
dispatchEvent(
e);
}
}
}
/**
* Makes this <code>Component</code> undisplayable by destroying it native
* screen resource.
* <p>
* This method is called by the toolkit internally and should
* not be called directly by programs. Code overriding
* this method should call <code>super.removeNotify</code> as
* the first line of the overriding method.
*
* @see #isDisplayable
* @see #addNotify
* @since JDK1.0
*/
public void
removeNotify() {
KeyboardFocusManager.
clearMostRecentFocusOwner(this);
if (
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
getPermanentFocusOwner() == this)
{
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
setGlobalPermanentFocusOwner(null);
}
synchronized (
getTreeLock()) {
if (
isFocusOwner() &&
KeyboardFocusManager.
isAutoFocusTransferEnabledFor(this)) {
transferFocus(true);
}
if (
getContainer() != null &&
isAddNotifyComplete) {
getContainer().
decreaseComponentCount(this);
}
int
npopups = (
popups != null?
popups.
size() : 0);
for (int
i = 0 ;
i <
npopups ;
i++) {
PopupMenu popup =
popups.
elementAt(
i);
popup.
removeNotify();
}
// If there is any input context for this component, notify
// that this component is being removed. (This has to be done
// before hiding peer.)
if ((
eventMask &
AWTEvent.
INPUT_METHODS_ENABLED_MASK) != 0) {
InputContext inputContext =
getInputContext();
if (
inputContext != null) {
inputContext.
removeNotify(this);
}
}
ComponentPeer p =
peer;
if (
p != null) {
boolean
isLightweight =
isLightweight();
if (
bufferStrategy instanceof
FlipBufferStrategy) {
((
FlipBufferStrategy)
bufferStrategy).
destroyBuffers();
}
if (
dropTarget != null)
dropTarget.
removeNotify(
peer);
// Hide peer first to stop system events such as cursor moves.
if (
visible) {
p.
setVisible(false);
}
peer = null; // Stop peer updates.
peerFont = null;
Toolkit.
getEventQueue().
removeSourceEvents(this, false);
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
discardKeyEvents(this);
p.
dispose();
mixOnHiding(
isLightweight);
isAddNotifyComplete = false;
// Nullifying compoundShape means that the component has normal shape
// (or has no shape at all).
this.
compoundShape = null;
}
if (
hierarchyListener != null ||
(
eventMask &
AWTEvent.
HIERARCHY_EVENT_MASK) != 0 ||
Toolkit.
enabledOnToolkit(
AWTEvent.
HIERARCHY_EVENT_MASK)) {
HierarchyEvent e =
new
HierarchyEvent(this,
HierarchyEvent.
HIERARCHY_CHANGED,
this,
parent,
HierarchyEvent.
DISPLAYABILITY_CHANGED |
((
isRecursivelyVisible())
?
HierarchyEvent.
SHOWING_CHANGED
: 0));
dispatchEvent(
e);
}
}
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processFocusEvent(FocusEvent).
*/
@
Deprecated
public boolean
gotFocus(
Event evt,
Object what) {
return false;
}
/**
* @deprecated As of JDK version 1.1,
* replaced by processFocusEvent(FocusEvent).
*/
@
Deprecated
public boolean
lostFocus(
Event evt,
Object what) {
return false;
}
/**
* Returns whether this <code>Component</code> can become the focus
* owner.
*
* @return <code>true</code> if this <code>Component</code> is
* focusable; <code>false</code> otherwise
* @see #setFocusable
* @since JDK1.1
* @deprecated As of 1.4, replaced by <code>isFocusable()</code>.
*/
@
Deprecated
public boolean
isFocusTraversable() {
if (
isFocusTraversableOverridden ==
FOCUS_TRAVERSABLE_UNKNOWN) {
isFocusTraversableOverridden =
FOCUS_TRAVERSABLE_DEFAULT;
}
return
focusable;
}
/**
* Returns whether this Component can be focused.
*
* @return <code>true</code> if this Component is focusable;
* <code>false</code> otherwise.
* @see #setFocusable
* @since 1.4
*/
public boolean
isFocusable() {
return
isFocusTraversable();
}
/**
* Sets the focusable state of this Component to the specified value. This
* value overrides the Component's default focusability.
*
* @param focusable indicates whether this Component is focusable
* @see #isFocusable
* @since 1.4
* @beaninfo
* bound: true
*/
public void
setFocusable(boolean
focusable) {
boolean
oldFocusable;
synchronized (this) {
oldFocusable = this.
focusable;
this.
focusable =
focusable;
}
isFocusTraversableOverridden =
FOCUS_TRAVERSABLE_SET;
firePropertyChange("focusable",
oldFocusable,
focusable);
if (
oldFocusable && !
focusable) {
if (
isFocusOwner() &&
KeyboardFocusManager.
isAutoFocusTransferEnabled()) {
transferFocus(true);
}
KeyboardFocusManager.
clearMostRecentFocusOwner(this);
}
}
final boolean
isFocusTraversableOverridden() {
return (
isFocusTraversableOverridden !=
FOCUS_TRAVERSABLE_DEFAULT);
}
/**
* Sets the focus traversal keys for a given traversal operation for this
* Component.
* <p>
* The default values for a Component's focus traversal keys are
* implementation-dependent. Sun recommends that all implementations for a
* particular native platform use the same default values. The
* recommendations for Windows and Unix are listed below. These
* recommendations are used in the Sun AWT implementations.
*
* <table border=1 summary="Recommended default values for a Component's focus traversal keys">
* <tr>
* <th>Identifier</th>
* <th>Meaning</th>
* <th>Default</th>
* </tr>
* <tr>
* <td>KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS</td>
* <td>Normal forward keyboard traversal</td>
* <td>TAB on KEY_PRESSED, CTRL-TAB on KEY_PRESSED</td>
* </tr>
* <tr>
* <td>KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS</td>
* <td>Normal reverse keyboard traversal</td>
* <td>SHIFT-TAB on KEY_PRESSED, CTRL-SHIFT-TAB on KEY_PRESSED</td>
* </tr>
* <tr>
* <td>KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS</td>
* <td>Go up one focus traversal cycle</td>
* <td>none</td>
* </tr>
* </table>
*
* To disable a traversal key, use an empty Set; Collections.EMPTY_SET is
* recommended.
* <p>
* Using the AWTKeyStroke API, client code can specify on which of two
* specific KeyEvents, KEY_PRESSED or KEY_RELEASED, the focus traversal
* operation will occur. Regardless of which KeyEvent is specified,
* however, all KeyEvents related to the focus traversal key, including the
* associated KEY_TYPED event, will be consumed, and will not be dispatched
* to any Component. It is a runtime error to specify a KEY_TYPED event as
* mapping to a focus traversal operation, or to map the same event to
* multiple default focus traversal operations.
* <p>
* If a value of null is specified for the Set, this Component inherits the
* Set from its parent. If all ancestors of this Component have null
* specified for the Set, then the current KeyboardFocusManager's default
* Set is used.
* <p>
* This method may throw a {@code ClassCastException} if any {@code Object}
* in {@code keystrokes} is not an {@code AWTKeyStroke}.
*
* @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @param keystrokes the Set of AWTKeyStroke for the specified operation
* @see #getFocusTraversalKeys
* @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
* @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
* @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
* @throws IllegalArgumentException if id is not one of
* KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or if keystrokes
* contains null, or if any keystroke represents a KEY_TYPED event,
* or if any keystroke already maps to another focus traversal
* operation for this Component
* @since 1.4
* @beaninfo
* bound: true
*/
public void
setFocusTraversalKeys(int
id,
Set<? extends
AWTKeyStroke>
keystrokes)
{
if (
id < 0 ||
id >=
KeyboardFocusManager.
TRAVERSAL_KEY_LENGTH - 1) {
throw new
IllegalArgumentException("invalid focus traversal key identifier");
}
setFocusTraversalKeys_NoIDCheck(
id,
keystrokes);
}
/**
* Returns the Set of focus traversal keys for a given traversal operation
* for this Component. (See
* <code>setFocusTraversalKeys</code> for a full description of each key.)
* <p>
* If a Set of traversal keys has not been explicitly defined for this
* Component, then this Component's parent's Set is returned. If no Set
* has been explicitly defined for any of this Component's ancestors, then
* the current KeyboardFocusManager's default Set is returned.
*
* @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @return the Set of AWTKeyStrokes for the specified operation. The Set
* will be unmodifiable, and may be empty. null will never be
* returned.
* @see #setFocusTraversalKeys
* @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
* @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
* @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
* @throws IllegalArgumentException if id is not one of
* KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @since 1.4
*/
public
Set<
AWTKeyStroke>
getFocusTraversalKeys(int
id) {
if (
id < 0 ||
id >=
KeyboardFocusManager.
TRAVERSAL_KEY_LENGTH - 1) {
throw new
IllegalArgumentException("invalid focus traversal key identifier");
}
return
getFocusTraversalKeys_NoIDCheck(
id);
}
// We define these methods so that Container does not need to repeat this
// code. Container cannot call super.<method> because Container allows
// DOWN_CYCLE_TRAVERSAL_KEY while Component does not. The Component method
// would erroneously generate an IllegalArgumentException for
// DOWN_CYCLE_TRAVERSAL_KEY.
final void
setFocusTraversalKeys_NoIDCheck(int
id,
Set<? extends
AWTKeyStroke>
keystrokes) {
Set<
AWTKeyStroke>
oldKeys;
synchronized (this) {
if (
focusTraversalKeys == null) {
initializeFocusTraversalKeys();
}
if (
keystrokes != null) {
for (
AWTKeyStroke keystroke :
keystrokes ) {
if (
keystroke == null) {
throw new
IllegalArgumentException("cannot set null focus traversal key");
}
if (
keystroke.
getKeyChar() !=
KeyEvent.
CHAR_UNDEFINED) {
throw new
IllegalArgumentException("focus traversal keys cannot map to KEY_TYPED events");
}
for (int
i = 0;
i <
focusTraversalKeys.length;
i++) {
if (
i ==
id) {
continue;
}
if (
getFocusTraversalKeys_NoIDCheck(
i).
contains(
keystroke))
{
throw new
IllegalArgumentException("focus traversal keys must be unique for a Component");
}
}
}
}
oldKeys =
focusTraversalKeys[
id];
focusTraversalKeys[
id] = (
keystrokes != null)
?
Collections.
unmodifiableSet(new
HashSet<
AWTKeyStroke>(
keystrokes))
: null;
}
firePropertyChange(
focusTraversalKeyPropertyNames[
id],
oldKeys,
keystrokes);
}
final
Set<
AWTKeyStroke>
getFocusTraversalKeys_NoIDCheck(int
id) {
// Okay to return Set directly because it is an unmodifiable view
@
SuppressWarnings("unchecked")
Set<
AWTKeyStroke>
keystrokes = (
focusTraversalKeys != null)
?
focusTraversalKeys[
id]
: null;
if (
keystrokes != null) {
return
keystrokes;
} else {
Container parent = this.
parent;
if (
parent != null) {
return
parent.
getFocusTraversalKeys(
id);
} else {
return
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
getDefaultFocusTraversalKeys(
id);
}
}
}
/**
* Returns whether the Set of focus traversal keys for the given focus
* traversal operation has been explicitly defined for this Component. If
* this method returns <code>false</code>, this Component is inheriting the
* Set from an ancestor, or from the current KeyboardFocusManager.
*
* @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @return <code>true</code> if the the Set of focus traversal keys for the
* given focus traversal operation has been explicitly defined for
* this Component; <code>false</code> otherwise.
* @throws IllegalArgumentException if id is not one of
* KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
* KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
* KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
* @since 1.4
*/
public boolean
areFocusTraversalKeysSet(int
id) {
if (
id < 0 ||
id >=
KeyboardFocusManager.
TRAVERSAL_KEY_LENGTH - 1) {
throw new
IllegalArgumentException("invalid focus traversal key identifier");
}
return (
focusTraversalKeys != null &&
focusTraversalKeys[
id] != null);
}
/**
* Sets whether focus traversal keys are enabled for this Component.
* Components for which focus traversal keys are disabled receive key
* events for focus traversal keys. Components for which focus traversal
* keys are enabled do not see these events; instead, the events are
* automatically converted to traversal operations.
*
* @param focusTraversalKeysEnabled whether focus traversal keys are
* enabled for this Component
* @see #getFocusTraversalKeysEnabled
* @see #setFocusTraversalKeys
* @see #getFocusTraversalKeys
* @since 1.4
* @beaninfo
* bound: true
*/
public void
setFocusTraversalKeysEnabled(boolean
focusTraversalKeysEnabled) {
boolean
oldFocusTraversalKeysEnabled;
synchronized (this) {
oldFocusTraversalKeysEnabled = this.
focusTraversalKeysEnabled;
this.
focusTraversalKeysEnabled =
focusTraversalKeysEnabled;
}
firePropertyChange("focusTraversalKeysEnabled",
oldFocusTraversalKeysEnabled,
focusTraversalKeysEnabled);
}
/**
* Returns whether focus traversal keys are enabled for this Component.
* Components for which focus traversal keys are disabled receive key
* events for focus traversal keys. Components for which focus traversal
* keys are enabled do not see these events; instead, the events are
* automatically converted to traversal operations.
*
* @return whether focus traversal keys are enabled for this Component
* @see #setFocusTraversalKeysEnabled
* @see #setFocusTraversalKeys
* @see #getFocusTraversalKeys
* @since 1.4
*/
public boolean
getFocusTraversalKeysEnabled() {
return
focusTraversalKeysEnabled;
}
/**
* Requests that this Component get the input focus, and that this
* Component's top-level ancestor become the focused Window. This
* component must be displayable, focusable, visible and all of
* its ancestors (with the exception of the top-level Window) must
* be visible for the request to be granted. Every effort will be
* made to honor the request; however, in some cases it may be
* impossible to do so. Developers must never assume that this
* Component is the focus owner until this Component receives a
* FOCUS_GAINED event. If this request is denied because this
* Component's top-level Window cannot become the focused Window,
* the request will be remembered and will be granted when the
* Window is later focused by the user.
* <p>
* This method cannot be used to set the focus owner to no Component at
* all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner()</code>
* instead.
* <p>
* Because the focus behavior of this method is platform-dependent,
* developers are strongly encouraged to use
* <code>requestFocusInWindow</code> when possible.
*
* <p>Note: Not all focus transfers result from invoking this method. As
* such, a component may receive focus without this or any of the other
* {@code requestFocus} methods of {@code Component} being invoked.
*
* @see #requestFocusInWindow
* @see java.awt.event.FocusEvent
* @see #addFocusListener
* @see #isFocusable
* @see #isDisplayable
* @see KeyboardFocusManager#clearGlobalFocusOwner
* @since JDK1.0
*/
public void
requestFocus() {
requestFocusHelper(false, true);
}
boolean
requestFocus(
CausedFocusEvent.
Cause cause) {
return
requestFocusHelper(false, true,
cause);
}
/**
* Requests that this <code>Component</code> get the input focus,
* and that this <code>Component</code>'s top-level ancestor
* become the focused <code>Window</code>. This component must be
* displayable, focusable, visible and all of its ancestors (with
* the exception of the top-level Window) must be visible for the
* request to be granted. Every effort will be made to honor the
* request; however, in some cases it may be impossible to do
* so. Developers must never assume that this component is the
* focus owner until this component receives a FOCUS_GAINED
* event. If this request is denied because this component's
* top-level window cannot become the focused window, the request
* will be remembered and will be granted when the window is later
* focused by the user.
* <p>
* This method returns a boolean value. If <code>false</code> is returned,
* the request is <b>guaranteed to fail</b>. If <code>true</code> is
* returned, the request will succeed <b>unless</b> it is vetoed, or an
* extraordinary event, such as disposal of the component's peer, occurs
* before the request can be granted by the native windowing system. Again,
* while a return value of <code>true</code> indicates that the request is
* likely to succeed, developers must never assume that this component is
* the focus owner until this component receives a FOCUS_GAINED event.
* <p>
* This method cannot be used to set the focus owner to no component at
* all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner</code>
* instead.
* <p>
* Because the focus behavior of this method is platform-dependent,
* developers are strongly encouraged to use
* <code>requestFocusInWindow</code> when possible.
* <p>
* Every effort will be made to ensure that <code>FocusEvent</code>s
* generated as a
* result of this request will have the specified temporary value. However,
* because specifying an arbitrary temporary state may not be implementable
* on all native windowing systems, correct behavior for this method can be
* guaranteed only for lightweight <code>Component</code>s.
* This method is not intended
* for general use, but exists instead as a hook for lightweight component
* libraries, such as Swing.
*
* <p>Note: Not all focus transfers result from invoking this method. As
* such, a component may receive focus without this or any of the other
* {@code requestFocus} methods of {@code Component} being invoked.
*
* @param temporary true if the focus change is temporary,
* such as when the window loses the focus; for
* more information on temporary focus changes see the
*<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
* @return <code>false</code> if the focus change request is guaranteed to
* fail; <code>true</code> if it is likely to succeed
* @see java.awt.event.FocusEvent
* @see #addFocusListener
* @see #isFocusable
* @see #isDisplayable
* @see KeyboardFocusManager#clearGlobalFocusOwner
* @since 1.4
*/
protected boolean
requestFocus(boolean
temporary) {
return
requestFocusHelper(
temporary, true);
}
boolean
requestFocus(boolean
temporary,
CausedFocusEvent.
Cause cause) {
return
requestFocusHelper(
temporary, true,
cause);
}
/**
* Requests that this Component get the input focus, if this
* Component's top-level ancestor is already the focused
* Window. This component must be displayable, focusable, visible
* and all of its ancestors (with the exception of the top-level
* Window) must be visible for the request to be granted. Every
* effort will be made to honor the request; however, in some
* cases it may be impossible to do so. Developers must never
* assume that this Component is the focus owner until this
* Component receives a FOCUS_GAINED event.
* <p>
* This method returns a boolean value. If <code>false</code> is returned,
* the request is <b>guaranteed to fail</b>. If <code>true</code> is
* returned, the request will succeed <b>unless</b> it is vetoed, or an
* extraordinary event, such as disposal of the Component's peer, occurs
* before the request can be granted by the native windowing system. Again,
* while a return value of <code>true</code> indicates that the request is
* likely to succeed, developers must never assume that this Component is
* the focus owner until this Component receives a FOCUS_GAINED event.
* <p>
* This method cannot be used to set the focus owner to no Component at
* all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner()</code>
* instead.
* <p>
* The focus behavior of this method can be implemented uniformly across
* platforms, and thus developers are strongly encouraged to use this
* method over <code>requestFocus</code> when possible. Code which relies
* on <code>requestFocus</code> may exhibit different focus behavior on
* different platforms.
*
* <p>Note: Not all focus transfers result from invoking this method. As
* such, a component may receive focus without this or any of the other
* {@code requestFocus} methods of {@code Component} being invoked.
*
* @return <code>false</code> if the focus change request is guaranteed to
* fail; <code>true</code> if it is likely to succeed
* @see #requestFocus
* @see java.awt.event.FocusEvent
* @see #addFocusListener
* @see #isFocusable
* @see #isDisplayable
* @see KeyboardFocusManager#clearGlobalFocusOwner
* @since 1.4
*/
public boolean
requestFocusInWindow() {
return
requestFocusHelper(false, false);
}
boolean
requestFocusInWindow(
CausedFocusEvent.
Cause cause) {
return
requestFocusHelper(false, false,
cause);
}
/**
* Requests that this <code>Component</code> get the input focus,
* if this <code>Component</code>'s top-level ancestor is already
* the focused <code>Window</code>. This component must be
* displayable, focusable, visible and all of its ancestors (with
* the exception of the top-level Window) must be visible for the
* request to be granted. Every effort will be made to honor the
* request; however, in some cases it may be impossible to do
* so. Developers must never assume that this component is the
* focus owner until this component receives a FOCUS_GAINED event.
* <p>
* This method returns a boolean value. If <code>false</code> is returned,
* the request is <b>guaranteed to fail</b>. If <code>true</code> is
* returned, the request will succeed <b>unless</b> it is vetoed, or an
* extraordinary event, such as disposal of the component's peer, occurs
* before the request can be granted by the native windowing system. Again,
* while a return value of <code>true</code> indicates that the request is
* likely to succeed, developers must never assume that this component is
* the focus owner until this component receives a FOCUS_GAINED event.
* <p>
* This method cannot be used to set the focus owner to no component at
* all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner</code>
* instead.
* <p>
* The focus behavior of this method can be implemented uniformly across
* platforms, and thus developers are strongly encouraged to use this
* method over <code>requestFocus</code> when possible. Code which relies
* on <code>requestFocus</code> may exhibit different focus behavior on
* different platforms.
* <p>
* Every effort will be made to ensure that <code>FocusEvent</code>s
* generated as a
* result of this request will have the specified temporary value. However,
* because specifying an arbitrary temporary state may not be implementable
* on all native windowing systems, correct behavior for this method can be
* guaranteed only for lightweight components. This method is not intended
* for general use, but exists instead as a hook for lightweight component
* libraries, such as Swing.
*
* <p>Note: Not all focus transfers result from invoking this method. As
* such, a component may receive focus without this or any of the other
* {@code requestFocus} methods of {@code Component} being invoked.
*
* @param temporary true if the focus change is temporary,
* such as when the window loses the focus; for
* more information on temporary focus changes see the
*<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
* @return <code>false</code> if the focus change request is guaranteed to
* fail; <code>true</code> if it is likely to succeed
* @see #requestFocus
* @see java.awt.event.FocusEvent
* @see #addFocusListener
* @see #isFocusable
* @see #isDisplayable
* @see KeyboardFocusManager#clearGlobalFocusOwner
* @since 1.4
*/
protected boolean
requestFocusInWindow(boolean
temporary) {
return
requestFocusHelper(
temporary, false);
}
boolean
requestFocusInWindow(boolean
temporary,
CausedFocusEvent.
Cause cause) {
return
requestFocusHelper(
temporary, false,
cause);
}
final boolean
requestFocusHelper(boolean
temporary,
boolean
focusedWindowChangeAllowed) {
return
requestFocusHelper(
temporary,
focusedWindowChangeAllowed,
CausedFocusEvent.
Cause.
UNKNOWN);
}
final boolean
requestFocusHelper(boolean
temporary,
boolean
focusedWindowChangeAllowed,
CausedFocusEvent.
Cause cause)
{
// 1) Check if the event being dispatched is a system-generated mouse event.
AWTEvent currentEvent =
EventQueue.
getCurrentEvent();
if (
currentEvent instanceof
MouseEvent &&
SunToolkit.
isSystemGenerated(
currentEvent))
{
// 2) Sanity check: if the mouse event component source belongs to the same containing window.
Component source = ((
MouseEvent)
currentEvent).
getComponent();
if (
source == null ||
source.
getContainingWindow() ==
getContainingWindow()) {
focusLog.
finest("requesting focus by mouse event \"in window\"");
// If both the conditions are fulfilled the focus request should be strictly
// bounded by the toplevel window. It's assumed that the mouse event activates
// the window (if it wasn't active) and this makes it possible for a focus
// request with a strong in-window requirement to change focus in the bounds
// of the toplevel. If, by any means, due to asynchronous nature of the event
// dispatching mechanism, the window happens to be natively inactive by the time
// this focus request is eventually handled, it should not re-activate the
// toplevel. Otherwise the result may not meet user expectations. See 6981400.
focusedWindowChangeAllowed = false;
}
}
if (!
isRequestFocusAccepted(
temporary,
focusedWindowChangeAllowed,
cause)) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("requestFocus is not accepted");
}
return false;
}
// Update most-recent map
KeyboardFocusManager.
setMostRecentFocusOwner(this);
Component window = this;
while ( (
window != null) && !(
window instanceof
Window)) {
if (!
window.
isVisible()) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("component is recurively invisible");
}
return false;
}
window =
window.
parent;
}
ComponentPeer peer = this.
peer;
Component heavyweight = (
peer instanceof
LightweightPeer)
?
getNativeContainer() : this;
if (
heavyweight == null || !
heavyweight.
isVisible()) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("Component is not a part of visible hierarchy");
}
return false;
}
peer =
heavyweight.
peer;
if (
peer == null) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("Peer is null");
}
return false;
}
// Focus this Component
long
time = 0;
if (
EventQueue.
isDispatchThread()) {
time =
Toolkit.
getEventQueue().
getMostRecentKeyEventTime();
} else {
// A focus request made from outside EDT should not be associated with any event
// and so its time stamp is simply set to the current time.
time =
System.
currentTimeMillis();
}
boolean
success =
peer.
requestFocus
(this,
temporary,
focusedWindowChangeAllowed,
time,
cause);
if (!
success) {
KeyboardFocusManager.
getCurrentKeyboardFocusManager
(
appContext).
dequeueKeyEvents(
time, this);
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("Peer request failed");
}
} else {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("Pass for " + this);
}
}
return
success;
}
private boolean
isRequestFocusAccepted(boolean
temporary,
boolean
focusedWindowChangeAllowed,
CausedFocusEvent.
Cause cause)
{
if (!
isFocusable() || !
isVisible()) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("Not focusable or not visible");
}
return false;
}
ComponentPeer peer = this.
peer;
if (
peer == null) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("peer is null");
}
return false;
}
Window window =
getContainingWindow();
if (
window == null || !
window.
isFocusableWindow()) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("Component doesn't have toplevel");
}
return false;
}
// We have passed all regular checks for focus request,
// now let's call RequestFocusController and see what it says.
Component focusOwner =
KeyboardFocusManager.
getMostRecentFocusOwner(
window);
if (
focusOwner == null) {
// sometimes most recent focus owner may be null, but focus owner is not
// e.g. we reset most recent focus owner if user removes focus owner
focusOwner =
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
getFocusOwner();
if (
focusOwner != null &&
focusOwner.
getContainingWindow() !=
window) {
focusOwner = null;
}
}
if (
focusOwner == this ||
focusOwner == null) {
// Controller is supposed to verify focus transfers and for this it
// should know both from and to components. And it shouldn't verify
// transfers from when these components are equal.
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("focus owner is null or this");
}
return true;
}
if (
CausedFocusEvent.
Cause.
ACTIVATION ==
cause) {
// we shouldn't call RequestFocusController in case we are
// in activation. We do request focus on component which
// has got temporary focus lost and then on component which is
// most recent focus owner. But most recent focus owner can be
// changed by requestFocsuXXX() call only, so this transfer has
// been already approved.
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("cause is activation");
}
return true;
}
boolean
ret =
Component.
requestFocusController.
acceptRequestFocus(
focusOwner,
this,
temporary,
focusedWindowChangeAllowed,
cause);
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
focusLog.
finest("RequestFocusController returns {0}",
ret);
}
return
ret;
}
private static
RequestFocusController requestFocusController = new
DummyRequestFocusController();
// Swing access this method through reflection to implement InputVerifier's functionality.
// Perhaps, we should make this method public (later ;)
private static class
DummyRequestFocusController implements
RequestFocusController {
public boolean
acceptRequestFocus(
Component from,
Component to,
boolean
temporary, boolean
focusedWindowChangeAllowed,
CausedFocusEvent.
Cause cause)
{
return true;
}
};
synchronized static void
setRequestFocusController(
RequestFocusController requestController)
{
if (
requestController == null) {
requestFocusController = new
DummyRequestFocusController();
} else {
requestFocusController =
requestController;
}
}
/**
* Returns the Container which is the focus cycle root of this Component's
* focus traversal cycle. Each focus traversal cycle has only a single
* focus cycle root and each Component which is not a Container belongs to
* only a single focus traversal cycle. Containers which are focus cycle
* roots belong to two cycles: one rooted at the Container itself, and one
* rooted at the Container's nearest focus-cycle-root ancestor. For such
* Containers, this method will return the Container's nearest focus-cycle-
* root ancestor.
*
* @return this Component's nearest focus-cycle-root ancestor
* @see Container#isFocusCycleRoot()
* @since 1.4
*/
public
Container getFocusCycleRootAncestor() {
Container rootAncestor = this.
parent;
while (
rootAncestor != null && !
rootAncestor.
isFocusCycleRoot()) {
rootAncestor =
rootAncestor.
parent;
}
return
rootAncestor;
}
/**
* Returns whether the specified Container is the focus cycle root of this
* Component's focus traversal cycle. Each focus traversal cycle has only
* a single focus cycle root and each Component which is not a Container
* belongs to only a single focus traversal cycle.
*
* @param container the Container to be tested
* @return <code>true</code> if the specified Container is a focus-cycle-
* root of this Component; <code>false</code> otherwise
* @see Container#isFocusCycleRoot()
* @since 1.4
*/
public boolean
isFocusCycleRoot(
Container container) {
Container rootAncestor =
getFocusCycleRootAncestor();
return (
rootAncestor ==
container);
}
Container getTraversalRoot() {
return
getFocusCycleRootAncestor();
}
/**
* Transfers the focus to the next component, as though this Component were
* the focus owner.
* @see #requestFocus()
* @since JDK1.1
*/
public void
transferFocus() {
nextFocus();
}
/**
* @deprecated As of JDK version 1.1,
* replaced by transferFocus().
*/
@
Deprecated
public void
nextFocus() {
transferFocus(false);
}
boolean
transferFocus(boolean
clearOnFailure) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("clearOnFailure = " +
clearOnFailure);
}
Component toFocus =
getNextFocusCandidate();
boolean
res = false;
if (
toFocus != null && !
toFocus.
isFocusOwner() &&
toFocus != this) {
res =
toFocus.
requestFocusInWindow(
CausedFocusEvent.
Cause.
TRAVERSAL_FORWARD);
}
if (
clearOnFailure && !
res) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("clear global focus owner");
}
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
clearGlobalFocusOwnerPriv();
}
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("returning result: " +
res);
}
return
res;
}
final
Component getNextFocusCandidate() {
Container rootAncestor =
getTraversalRoot();
Component comp = this;
while (
rootAncestor != null &&
!(
rootAncestor.
isShowing() &&
rootAncestor.
canBeFocusOwner()))
{
comp =
rootAncestor;
rootAncestor =
comp.
getFocusCycleRootAncestor();
}
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("comp = " +
comp + ", root = " +
rootAncestor);
}
Component candidate = null;
if (
rootAncestor != null) {
FocusTraversalPolicy policy =
rootAncestor.
getFocusTraversalPolicy();
Component toFocus =
policy.
getComponentAfter(
rootAncestor,
comp);
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("component after is " +
toFocus);
}
if (
toFocus == null) {
toFocus =
policy.
getDefaultComponent(
rootAncestor);
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("default component is " +
toFocus);
}
}
if (
toFocus == null) {
Applet applet =
EmbeddedFrame.
getAppletIfAncestorOf(this);
if (
applet != null) {
toFocus =
applet;
}
}
candidate =
toFocus;
}
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("Focus transfer candidate: " +
candidate);
}
return
candidate;
}
/**
* Transfers the focus to the previous component, as though this Component
* were the focus owner.
* @see #requestFocus()
* @since 1.4
*/
public void
transferFocusBackward() {
transferFocusBackward(false);
}
boolean
transferFocusBackward(boolean
clearOnFailure) {
Container rootAncestor =
getTraversalRoot();
Component comp = this;
while (
rootAncestor != null &&
!(
rootAncestor.
isShowing() &&
rootAncestor.
canBeFocusOwner()))
{
comp =
rootAncestor;
rootAncestor =
comp.
getFocusCycleRootAncestor();
}
boolean
res = false;
if (
rootAncestor != null) {
FocusTraversalPolicy policy =
rootAncestor.
getFocusTraversalPolicy();
Component toFocus =
policy.
getComponentBefore(
rootAncestor,
comp);
if (
toFocus == null) {
toFocus =
policy.
getDefaultComponent(
rootAncestor);
}
if (
toFocus != null) {
res =
toFocus.
requestFocusInWindow(
CausedFocusEvent.
Cause.
TRAVERSAL_BACKWARD);
}
}
if (
clearOnFailure && !
res) {
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("clear global focus owner");
}
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
clearGlobalFocusOwnerPriv();
}
if (
focusLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
focusLog.
finer("returning result: " +
res);
}
return
res;
}
/**
* Transfers the focus up one focus traversal cycle. Typically, the focus
* owner is set to this Component's focus cycle root, and the current focus
* cycle root is set to the new focus owner's focus cycle root. If,
* however, this Component's focus cycle root is a Window, then the focus
* owner is set to the focus cycle root's default Component to focus, and
* the current focus cycle root is unchanged.
*
* @see #requestFocus()
* @see Container#isFocusCycleRoot()
* @see Container#setFocusCycleRoot(boolean)
* @since 1.4
*/
public void
transferFocusUpCycle() {
Container rootAncestor;
for (
rootAncestor =
getFocusCycleRootAncestor();
rootAncestor != null && !(
rootAncestor.
isShowing() &&
rootAncestor.
isFocusable() &&
rootAncestor.
isEnabled());
rootAncestor =
rootAncestor.
getFocusCycleRootAncestor()) {
}
if (
rootAncestor != null) {
Container rootAncestorRootAncestor =
rootAncestor.
getFocusCycleRootAncestor();
Container fcr = (
rootAncestorRootAncestor != null) ?
rootAncestorRootAncestor :
rootAncestor;
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
setGlobalCurrentFocusCycleRootPriv(
fcr);
rootAncestor.
requestFocus(
CausedFocusEvent.
Cause.
TRAVERSAL_UP);
} else {
Window window =
getContainingWindow();
if (
window != null) {
Component toFocus =
window.
getFocusTraversalPolicy().
getDefaultComponent(
window);
if (
toFocus != null) {
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
setGlobalCurrentFocusCycleRootPriv(
window);
toFocus.
requestFocus(
CausedFocusEvent.
Cause.
TRAVERSAL_UP);
}
}
}
}
/**
* Returns <code>true</code> if this <code>Component</code> is the
* focus owner. This method is obsolete, and has been replaced by
* <code>isFocusOwner()</code>.
*
* @return <code>true</code> if this <code>Component</code> is the
* focus owner; <code>false</code> otherwise
* @since 1.2
*/
public boolean
hasFocus() {
return (
KeyboardFocusManager.
getCurrentKeyboardFocusManager().
getFocusOwner() == this);
}
/**
* Returns <code>true</code> if this <code>Component</code> is the
* focus owner.
*
* @return <code>true</code> if this <code>Component</code> is the
* focus owner; <code>false</code> otherwise
* @since 1.4
*/
public boolean
isFocusOwner() {
return
hasFocus();
}
/*
* Used to disallow auto-focus-transfer on disposal of the focus owner
* in the process of disposing its parent container.
*/
private boolean
autoFocusTransferOnDisposal = true;
void
setAutoFocusTransferOnDisposal(boolean
value) {
autoFocusTransferOnDisposal =
value;
}
boolean
isAutoFocusTransferOnDisposal() {
return
autoFocusTransferOnDisposal;
}
/**
* Adds the specified popup menu to the component.
* @param popup the popup menu to be added to the component.
* @see #remove(MenuComponent)
* @exception NullPointerException if {@code popup} is {@code null}
* @since JDK1.1
*/
public void
add(
PopupMenu popup) {
synchronized (
getTreeLock()) {
if (
popup.
parent != null) {
popup.
parent.
remove(
popup);
}
if (
popups == null) {
popups = new
Vector<
PopupMenu>();
}
popups.
addElement(
popup);
popup.
parent = this;
if (
peer != null) {
if (
popup.
peer == null) {
popup.
addNotify();
}
}
}
}
/**
* Removes the specified popup menu from the component.
* @param popup the popup menu to be removed
* @see #add(PopupMenu)
* @since JDK1.1
*/
@
SuppressWarnings("unchecked")
public void
remove(
MenuComponent popup) {
synchronized (
getTreeLock()) {
if (
popups == null) {
return;
}
int
index =
popups.
indexOf(
popup);
if (
index >= 0) {
PopupMenu pmenu = (
PopupMenu)
popup;
if (
pmenu.
peer != null) {
pmenu.
removeNotify();
}
pmenu.
parent = null;
popups.
removeElementAt(
index);
if (
popups.
size() == 0) {
popups = null;
}
}
}
}
/**
* Returns a string representing the state of this component. This
* method is intended to be used only for debugging purposes, and the
* content and format of the returned string may vary between
* implementations. The returned string may be empty but may not be
* <code>null</code>.
*
* @return a string representation of this component's state
* @since JDK1.0
*/
protected
String paramString() {
final
String thisName =
Objects.
toString(
getName(), "");
final
String invalid =
isValid() ? "" : ",invalid";
final
String hidden =
visible ? "" : ",hidden";
final
String disabled =
enabled ? "" : ",disabled";
return
thisName + ',' +
x + ',' +
y + ',' +
width + 'x' +
height
+
invalid +
hidden +
disabled;
}
/**
* Returns a string representation of this component and its values.
* @return a string representation of this component
* @since JDK1.0
*/
public
String toString() {
return
getClass().
getName() + '[' +
paramString() + ']';
}
/**
* Prints a listing of this component to the standard system output
* stream <code>System.out</code>.
* @see java.lang.System#out
* @since JDK1.0
*/
public void
list() {
list(
System.
out, 0);
}
/**
* Prints a listing of this component to the specified output
* stream.
* @param out a print stream
* @throws NullPointerException if {@code out} is {@code null}
* @since JDK1.0
*/
public void
list(
PrintStream out) {
list(
out, 0);
}
/**
* Prints out a list, starting at the specified indentation, to the
* specified print stream.
* @param out a print stream
* @param indent number of spaces to indent
* @see java.io.PrintStream#println(java.lang.Object)
* @throws NullPointerException if {@code out} is {@code null}
* @since JDK1.0
*/
public void
list(
PrintStream out, int
indent) {
for (int
i = 0 ;
i <
indent ;
i++) {
out.
print(" ");
}
out.
println(this);
}
/**
* Prints a listing to the specified print writer.
* @param out the print writer to print to
* @throws NullPointerException if {@code out} is {@code null}
* @since JDK1.1
*/
public void
list(
PrintWriter out) {
list(
out, 0);
}
/**
* Prints out a list, starting at the specified indentation, to
* the specified print writer.
* @param out the print writer to print to
* @param indent the number of spaces to indent
* @throws NullPointerException if {@code out} is {@code null}
* @see java.io.PrintStream#println(java.lang.Object)
* @since JDK1.1
*/
public void
list(
PrintWriter out, int
indent) {
for (int
i = 0 ;
i <
indent ;
i++) {
out.
print(" ");
}
out.
println(this);
}
/*
* Fetches the native container somewhere higher up in the component
* tree that contains this component.
*/
final
Container getNativeContainer() {
Container p =
getContainer();
while (
p != null &&
p.
peer instanceof
LightweightPeer) {
p =
p.
getContainer();
}
return
p;
}
/**
* Adds a PropertyChangeListener to the listener list. The listener is
* registered for all bound properties of this class, including the
* following:
* <ul>
* <li>this Component's font ("font")</li>
* <li>this Component's background color ("background")</li>
* <li>this Component's foreground color ("foreground")</li>
* <li>this Component's focusability ("focusable")</li>
* <li>this Component's focus traversal keys enabled state
* ("focusTraversalKeysEnabled")</li>
* <li>this Component's Set of FORWARD_TRAVERSAL_KEYS
* ("forwardFocusTraversalKeys")</li>
* <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS
* ("backwardFocusTraversalKeys")</li>
* <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS
* ("upCycleFocusTraversalKeys")</li>
* <li>this Component's preferred size ("preferredSize")</li>
* <li>this Component's minimum size ("minimumSize")</li>
* <li>this Component's maximum size ("maximumSize")</li>
* <li>this Component's name ("name")</li>
* </ul>
* Note that if this <code>Component</code> is inheriting a bound property, then no
* event will be fired in response to a change in the inherited property.
* <p>
* If <code>listener</code> is <code>null</code>,
* no exception is thrown and no action is performed.
*
* @param listener the property change listener to be added
*
* @see #removePropertyChangeListener
* @see #getPropertyChangeListeners
* @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
*/
public void
addPropertyChangeListener(
PropertyChangeListener listener) {
synchronized (
getObjectLock()) {
if (
listener == null) {
return;
}
if (
changeSupport == null) {
changeSupport = new
PropertyChangeSupport(this);
}
changeSupport.
addPropertyChangeListener(
listener);
}
}
/**
* Removes a PropertyChangeListener from the listener list. This method
* should be used to remove PropertyChangeListeners that were registered
* for all bound properties of this class.
* <p>
* If listener is null, no exception is thrown and no action is performed.
*
* @param listener the PropertyChangeListener to be removed
*
* @see #addPropertyChangeListener
* @see #getPropertyChangeListeners
* @see #removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
*/
public void
removePropertyChangeListener(
PropertyChangeListener listener) {
synchronized (
getObjectLock()) {
if (
listener == null ||
changeSupport == null) {
return;
}
changeSupport.
removePropertyChangeListener(
listener);
}
}
/**
* Returns an array of all the property change listeners
* registered on this component.
*
* @return all of this component's <code>PropertyChangeListener</code>s
* or an empty array if no property change
* listeners are currently registered
*
* @see #addPropertyChangeListener
* @see #removePropertyChangeListener
* @see #getPropertyChangeListeners(java.lang.String)
* @see java.beans.PropertyChangeSupport#getPropertyChangeListeners
* @since 1.4
*/
public
PropertyChangeListener[]
getPropertyChangeListeners() {
synchronized (
getObjectLock()) {
if (
changeSupport == null) {
return new
PropertyChangeListener[0];
}
return
changeSupport.
getPropertyChangeListeners();
}
}
/**
* Adds a PropertyChangeListener to the listener list for a specific
* property. The specified property may be user-defined, or one of the
* following:
* <ul>
* <li>this Component's font ("font")</li>
* <li>this Component's background color ("background")</li>
* <li>this Component's foreground color ("foreground")</li>
* <li>this Component's focusability ("focusable")</li>
* <li>this Component's focus traversal keys enabled state
* ("focusTraversalKeysEnabled")</li>
* <li>this Component's Set of FORWARD_TRAVERSAL_KEYS
* ("forwardFocusTraversalKeys")</li>
* <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS
* ("backwardFocusTraversalKeys")</li>
* <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS
* ("upCycleFocusTraversalKeys")</li>
* </ul>
* Note that if this <code>Component</code> is inheriting a bound property, then no
* event will be fired in response to a change in the inherited property.
* <p>
* If <code>propertyName</code> or <code>listener</code> is <code>null</code>,
* no exception is thrown and no action is taken.
*
* @param propertyName one of the property names listed above
* @param listener the property change listener to be added
*
* @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
* @see #getPropertyChangeListeners(java.lang.String)
* @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
*/
public void
addPropertyChangeListener(
String propertyName,
PropertyChangeListener listener) {
synchronized (
getObjectLock()) {
if (
listener == null) {
return;
}
if (
changeSupport == null) {
changeSupport = new
PropertyChangeSupport(this);
}
changeSupport.
addPropertyChangeListener(
propertyName,
listener);
}
}
/**
* Removes a <code>PropertyChangeListener</code> from the listener
* list for a specific property. This method should be used to remove
* <code>PropertyChangeListener</code>s
* that were registered for a specific bound property.
* <p>
* If <code>propertyName</code> or <code>listener</code> is <code>null</code>,
* no exception is thrown and no action is taken.
*
* @param propertyName a valid property name
* @param listener the PropertyChangeListener to be removed
*
* @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
* @see #getPropertyChangeListeners(java.lang.String)
* @see #removePropertyChangeListener(java.beans.PropertyChangeListener)
*/
public void
removePropertyChangeListener(
String propertyName,
PropertyChangeListener listener) {
synchronized (
getObjectLock()) {
if (
listener == null ||
changeSupport == null) {
return;
}
changeSupport.
removePropertyChangeListener(
propertyName,
listener);
}
}
/**
* Returns an array of all the listeners which have been associated
* with the named property.
*
* @return all of the <code>PropertyChangeListener</code>s associated with
* the named property; if no such listeners have been added or
* if <code>propertyName</code> is <code>null</code>, an empty
* array is returned
*
* @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
* @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
* @see #getPropertyChangeListeners
* @since 1.4
*/
public
PropertyChangeListener[]
getPropertyChangeListeners(
String propertyName) {
synchronized (
getObjectLock()) {
if (
changeSupport == null) {
return new
PropertyChangeListener[0];
}
return
changeSupport.
getPropertyChangeListeners(
propertyName);
}
}
/**
* Support for reporting bound property changes for Object properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
*/
protected void
firePropertyChange(
String propertyName,
Object oldValue,
Object newValue) {
PropertyChangeSupport changeSupport;
synchronized (
getObjectLock()) {
changeSupport = this.
changeSupport;
}
if (
changeSupport == null ||
(
oldValue != null &&
newValue != null &&
oldValue.
equals(
newValue))) {
return;
}
changeSupport.
firePropertyChange(
propertyName,
oldValue,
newValue);
}
/**
* Support for reporting bound property changes for boolean properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
* @since 1.4
*/
protected void
firePropertyChange(
String propertyName,
boolean
oldValue, boolean
newValue) {
PropertyChangeSupport changeSupport = this.
changeSupport;
if (
changeSupport == null ||
oldValue ==
newValue) {
return;
}
changeSupport.
firePropertyChange(
propertyName,
oldValue,
newValue);
}
/**
* Support for reporting bound property changes for integer properties.
* This method can be called when a bound property has changed and it will
* send the appropriate PropertyChangeEvent to any registered
* PropertyChangeListeners.
*
* @param propertyName the property whose value has changed
* @param oldValue the property's previous value
* @param newValue the property's new value
* @since 1.4
*/
protected void
firePropertyChange(
String propertyName,
int
oldValue, int
newValue) {
PropertyChangeSupport changeSupport = this.
changeSupport;
if (
changeSupport == null ||
oldValue ==
newValue) {
return;
}
changeSupport.
firePropertyChange(
propertyName,
oldValue,
newValue);
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a byte)
* @param newValue the new value of the property (as a byte)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void
firePropertyChange(
String propertyName, byte
oldValue, byte
newValue) {
if (
changeSupport == null ||
oldValue ==
newValue) {
return;
}
firePropertyChange(
propertyName,
Byte.
valueOf(
oldValue),
Byte.
valueOf(
newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a char)
* @param newValue the new value of the property (as a char)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void
firePropertyChange(
String propertyName, char
oldValue, char
newValue) {
if (
changeSupport == null ||
oldValue ==
newValue) {
return;
}
firePropertyChange(
propertyName, new
Character(
oldValue), new
Character(
newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a short)
* @param newValue the old value of the property (as a short)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void
firePropertyChange(
String propertyName, short
oldValue, short
newValue) {
if (
changeSupport == null ||
oldValue ==
newValue) {
return;
}
firePropertyChange(
propertyName,
Short.
valueOf(
oldValue),
Short.
valueOf(
newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a long)
* @param newValue the new value of the property (as a long)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void
firePropertyChange(
String propertyName, long
oldValue, long
newValue) {
if (
changeSupport == null ||
oldValue ==
newValue) {
return;
}
firePropertyChange(
propertyName,
Long.
valueOf(
oldValue),
Long.
valueOf(
newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a float)
* @param newValue the new value of the property (as a float)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void
firePropertyChange(
String propertyName, float
oldValue, float
newValue) {
if (
changeSupport == null ||
oldValue ==
newValue) {
return;
}
firePropertyChange(
propertyName,
Float.
valueOf(
oldValue),
Float.
valueOf(
newValue));
}
/**
* Reports a bound property change.
*
* @param propertyName the programmatic name of the property
* that was changed
* @param oldValue the old value of the property (as a double)
* @param newValue the new value of the property (as a double)
* @see #firePropertyChange(java.lang.String, java.lang.Object,
* java.lang.Object)
* @since 1.5
*/
public void
firePropertyChange(
String propertyName, double
oldValue, double
newValue) {
if (
changeSupport == null ||
oldValue ==
newValue) {
return;
}
firePropertyChange(
propertyName,
Double.
valueOf(
oldValue),
Double.
valueOf(
newValue));
}
// Serialization support.
/**
* Component Serialized Data Version.
*
* @serial
*/
private int
componentSerializedDataVersion = 4;
/**
* This hack is for Swing serialization. It will invoke
* the Swing package private method <code>compWriteObjectNotify</code>.
*/
private void
doSwingSerialization() {
Package swingPackage =
Package.
getPackage("javax.swing");
// For Swing serialization to correctly work Swing needs to
// be notified before Component does it's serialization. This
// hack accomodates this.
//
// Swing classes MUST be loaded by the bootstrap class loader,
// otherwise we don't consider them.
for (
Class<?>
klass =
Component.this.
getClass();
klass != null;
klass =
klass.
getSuperclass()) {
if (
klass.
getPackage() ==
swingPackage &&
klass.
getClassLoader() == null) {
final
Class<?>
swingClass =
klass;
// Find the first override of the compWriteObjectNotify method
Method[]
methods =
AccessController.
doPrivileged(
new
PrivilegedAction<
Method[]>() {
public
Method[]
run() {
return
swingClass.
getDeclaredMethods();
}
});
for (int
counter =
methods.length - 1;
counter >= 0;
counter--) {
final
Method method =
methods[
counter];
if (
method.
getName().
equals("compWriteObjectNotify")){
// We found it, use doPrivileged to make it accessible
// to use.
AccessController.
doPrivileged(new
PrivilegedAction<
Void>() {
public
Void run() {
method.
setAccessible(true);
return null;
}
});
// Invoke the method
try {
method.
invoke(this, (
Object[]) null);
} catch (
IllegalAccessException iae) {
} catch (
InvocationTargetException ite) {
}
// We're done, bail.
return;
}
}
}
}
}
/**
* Writes default serializable fields to stream. Writes
* a variety of serializable listeners as optional data.
* The non-serializable listeners are detected and
* no attempt is made to serialize them.
*
* @param s the <code>ObjectOutputStream</code> to write
* @serialData <code>null</code> terminated sequence of
* 0 or more pairs; the pair consists of a <code>String</code>
* and an <code>Object</code>; the <code>String</code> indicates
* the type of object and is one of the following (as of 1.4):
* <code>componentListenerK</code> indicating an
* <code>ComponentListener</code> object;
* <code>focusListenerK</code> indicating an
* <code>FocusListener</code> object;
* <code>keyListenerK</code> indicating an
* <code>KeyListener</code> object;
* <code>mouseListenerK</code> indicating an
* <code>MouseListener</code> object;
* <code>mouseMotionListenerK</code> indicating an
* <code>MouseMotionListener</code> object;
* <code>inputMethodListenerK</code> indicating an
* <code>InputMethodListener</code> object;
* <code>hierarchyListenerK</code> indicating an
* <code>HierarchyListener</code> object;
* <code>hierarchyBoundsListenerK</code> indicating an
* <code>HierarchyBoundsListener</code> object;
* <code>mouseWheelListenerK</code> indicating an
* <code>MouseWheelListener</code> object
* @serialData an optional <code>ComponentOrientation</code>
* (after <code>inputMethodListener</code>, as of 1.2)
*
* @see AWTEventMulticaster#save(java.io.ObjectOutputStream, java.lang.String, java.util.EventListener)
* @see #componentListenerK
* @see #focusListenerK
* @see #keyListenerK
* @see #mouseListenerK
* @see #mouseMotionListenerK
* @see #inputMethodListenerK
* @see #hierarchyListenerK
* @see #hierarchyBoundsListenerK
* @see #mouseWheelListenerK
* @see #readObject(ObjectInputStream)
*/
private void
writeObject(
ObjectOutputStream s)
throws
IOException
{
doSwingSerialization();
s.
defaultWriteObject();
AWTEventMulticaster.
save(
s,
componentListenerK,
componentListener);
AWTEventMulticaster.
save(
s,
focusListenerK,
focusListener);
AWTEventMulticaster.
save(
s,
keyListenerK,
keyListener);
AWTEventMulticaster.
save(
s,
mouseListenerK,
mouseListener);
AWTEventMulticaster.
save(
s,
mouseMotionListenerK,
mouseMotionListener);
AWTEventMulticaster.
save(
s,
inputMethodListenerK,
inputMethodListener);
s.
writeObject(null);
s.
writeObject(
componentOrientation);
AWTEventMulticaster.
save(
s,
hierarchyListenerK,
hierarchyListener);
AWTEventMulticaster.
save(
s,
hierarchyBoundsListenerK,
hierarchyBoundsListener);
s.
writeObject(null);
AWTEventMulticaster.
save(
s,
mouseWheelListenerK,
mouseWheelListener);
s.
writeObject(null);
}
/**
* Reads the <code>ObjectInputStream</code> and if it isn't
* <code>null</code> adds a listener to receive a variety
* of events fired by the component.
* Unrecognized keys or values will be ignored.
*
* @param s the <code>ObjectInputStream</code> to read
* @see #writeObject(ObjectOutputStream)
*/
private void
readObject(
ObjectInputStream s)
throws
ClassNotFoundException,
IOException
{
objectLock = new
Object();
acc =
AccessController.
getContext();
s.
defaultReadObject();
appContext =
AppContext.
getAppContext();
coalescingEnabled =
checkCoalescing();
if (
componentSerializedDataVersion < 4) {
// These fields are non-transient and rely on default
// serialization. However, the default values are insufficient,
// so we need to set them explicitly for object data streams prior
// to 1.4.
focusable = true;
isFocusTraversableOverridden =
FOCUS_TRAVERSABLE_UNKNOWN;
initializeFocusTraversalKeys();
focusTraversalKeysEnabled = true;
}
Object keyOrNull;
while(null != (
keyOrNull =
s.
readObject())) {
String key = ((
String)
keyOrNull).
intern();
if (
componentListenerK ==
key)
addComponentListener((
ComponentListener)(
s.
readObject()));
else if (
focusListenerK ==
key)
addFocusListener((
FocusListener)(
s.
readObject()));
else if (
keyListenerK ==
key)
addKeyListener((
KeyListener)(
s.
readObject()));
else if (
mouseListenerK ==
key)
addMouseListener((
MouseListener)(
s.
readObject()));
else if (
mouseMotionListenerK ==
key)
addMouseMotionListener((
MouseMotionListener)(
s.
readObject()));
else if (
inputMethodListenerK ==
key)
addInputMethodListener((
InputMethodListener)(
s.
readObject()));
else // skip value for unrecognized key
s.
readObject();
}
// Read the component's orientation if it's present
Object orient = null;
try {
orient =
s.
readObject();
} catch (java.io.
OptionalDataException e) {
// JDK 1.1 instances will not have this optional data.
// e.eof will be true to indicate that there is no more
// data available for this object.
// If e.eof is not true, throw the exception as it
// might have been caused by reasons unrelated to
// componentOrientation.
if (!
e.
eof) {
throw (
e);
}
}
if (
orient != null) {
componentOrientation = (
ComponentOrientation)
orient;
} else {
componentOrientation =
ComponentOrientation.
UNKNOWN;
}
try {
while(null != (
keyOrNull =
s.
readObject())) {
String key = ((
String)
keyOrNull).
intern();
if (
hierarchyListenerK ==
key) {
addHierarchyListener((
HierarchyListener)(
s.
readObject()));
}
else if (
hierarchyBoundsListenerK ==
key) {
addHierarchyBoundsListener((
HierarchyBoundsListener)
(
s.
readObject()));
}
else {
// skip value for unrecognized key
s.
readObject();
}
}
} catch (java.io.
OptionalDataException e) {
// JDK 1.1/1.2 instances will not have this optional data.
// e.eof will be true to indicate that there is no more
// data available for this object.
// If e.eof is not true, throw the exception as it
// might have been caused by reasons unrelated to
// hierarchy and hierarchyBounds listeners.
if (!
e.
eof) {
throw (
e);
}
}
try {
while (null != (
keyOrNull =
s.
readObject())) {
String key = ((
String)
keyOrNull).
intern();
if (
mouseWheelListenerK ==
key) {
addMouseWheelListener((
MouseWheelListener)(
s.
readObject()));
}
else {
// skip value for unrecognized key
s.
readObject();
}
}
} catch (java.io.
OptionalDataException e) {
// pre-1.3 instances will not have this optional data.
// e.eof will be true to indicate that there is no more
// data available for this object.
// If e.eof is not true, throw the exception as it
// might have been caused by reasons unrelated to
// mouse wheel listeners
if (!
e.
eof) {
throw (
e);
}
}
if (
popups != null) {
int
npopups =
popups.
size();
for (int
i = 0 ;
i <
npopups ;
i++) {
PopupMenu popup =
popups.
elementAt(
i);
popup.
parent = this;
}
}
}
/**
* Sets the language-sensitive orientation that is to be used to order
* the elements or text within this component. Language-sensitive
* <code>LayoutManager</code> and <code>Component</code>
* subclasses will use this property to
* determine how to lay out and draw components.
* <p>
* At construction time, a component's orientation is set to
* <code>ComponentOrientation.UNKNOWN</code>,
* indicating that it has not been specified
* explicitly. The UNKNOWN orientation behaves the same as
* <code>ComponentOrientation.LEFT_TO_RIGHT</code>.
* <p>
* To set the orientation of a single component, use this method.
* To set the orientation of an entire component
* hierarchy, use
* {@link #applyComponentOrientation applyComponentOrientation}.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
*
* @see ComponentOrientation
* @see #invalidate
*
* @author Laura Werner, IBM
* @beaninfo
* bound: true
*/
public void
setComponentOrientation(
ComponentOrientation o) {
ComponentOrientation oldValue =
componentOrientation;
componentOrientation =
o;
// This is a bound property, so report the change to
// any registered listeners. (Cheap if there are none.)
firePropertyChange("componentOrientation",
oldValue,
o);
// This could change the preferred size of the Component.
invalidateIfValid();
}
/**
* Retrieves the language-sensitive orientation that is to be used to order
* the elements or text within this component. <code>LayoutManager</code>
* and <code>Component</code>
* subclasses that wish to respect orientation should call this method to
* get the component's orientation before performing layout or drawing.
*
* @see ComponentOrientation
*
* @author Laura Werner, IBM
*/
public
ComponentOrientation getComponentOrientation() {
return
componentOrientation;
}
/**
* Sets the <code>ComponentOrientation</code> property of this component
* and all components contained within it.
* <p>
* This method changes layout-related information, and therefore,
* invalidates the component hierarchy.
*
*
* @param orientation the new component orientation of this component and
* the components contained within it.
* @exception NullPointerException if <code>orientation</code> is null.
* @see #setComponentOrientation
* @see #getComponentOrientation
* @see #invalidate
* @since 1.4
*/
public void
applyComponentOrientation(
ComponentOrientation orientation) {
if (
orientation == null) {
throw new
NullPointerException();
}
setComponentOrientation(
orientation);
}
final boolean
canBeFocusOwner() {
// It is enabled, visible, focusable.
if (
isEnabled() &&
isDisplayable() &&
isVisible() &&
isFocusable()) {
return true;
}
return false;
}
/**
* Checks that this component meets the prerequesites to be focus owner:
* - it is enabled, visible, focusable
* - it's parents are all enabled and showing
* - top-level window is focusable
* - if focus cycle root has DefaultFocusTraversalPolicy then it also checks that this policy accepts
* this component as focus owner
* @since 1.5
*/
final boolean
canBeFocusOwnerRecursively() {
// - it is enabled, visible, focusable
if (!
canBeFocusOwner()) {
return false;
}
// - it's parents are all enabled and showing
synchronized(
getTreeLock()) {
if (
parent != null) {
return
parent.
canContainFocusOwner(this);
}
}
return true;
}
/**
* Fix the location of the HW component in a LW container hierarchy.
*/
final void
relocateComponent() {
synchronized (
getTreeLock()) {
if (
peer == null) {
return;
}
int
nativeX =
x;
int
nativeY =
y;
for (
Component cont =
getContainer();
cont != null &&
cont.
isLightweight();
cont =
cont.
getContainer())
{
nativeX +=
cont.
x;
nativeY +=
cont.
y;
}
peer.
setBounds(
nativeX,
nativeY,
width,
height,
ComponentPeer.
SET_LOCATION);
}
}
/**
* Returns the <code>Window</code> ancestor of the component.
* @return Window ancestor of the component or component by itself if it is Window;
* null, if component is not a part of window hierarchy
*/
Window getContainingWindow() {
return
SunToolkit.
getContainingWindow(this);
}
/**
* Initialize JNI field and method IDs
*/
private static native void
initIDs();
/*
* --- Accessibility Support ---
*
* Component will contain all of the methods in interface Accessible,
* though it won't actually implement the interface - that will be up
* to the individual objects which extend Component.
*/
/**
* The {@code AccessibleContext} associated with this {@code Component}.
*/
protected
AccessibleContext accessibleContext = null;
/**
* Gets the <code>AccessibleContext</code> associated
* with this <code>Component</code>.
* The method implemented by this base
* class returns null. Classes that extend <code>Component</code>
* should implement this method to return the
* <code>AccessibleContext</code> associated with the subclass.
*
*
* @return the <code>AccessibleContext</code> of this
* <code>Component</code>
* @since 1.3
*/
public
AccessibleContext getAccessibleContext() {
return
accessibleContext;
}
/**
* Inner class of Component used to provide default support for
* accessibility. This class is not meant to be used directly by
* application developers, but is instead meant only to be
* subclassed by component developers.
* <p>
* The class used to obtain the accessible role for this object.
* @since 1.3
*/
protected abstract class
AccessibleAWTComponent extends
AccessibleContext
implements
Serializable,
AccessibleComponent {
private static final long
serialVersionUID = 642321655757800191L;
/**
* Though the class is abstract, this should be called by
* all sub-classes.
*/
protected
AccessibleAWTComponent() {
}
/**
* Number of PropertyChangeListener objects registered. It's used
* to add/remove ComponentListener and FocusListener to track
* target Component's state.
*/
private volatile transient int
propertyListenersCount = 0;
protected
ComponentListener accessibleAWTComponentHandler = null;
protected
FocusListener accessibleAWTFocusHandler = null;
/**
* Fire PropertyChange listener, if one is registered,
* when shown/hidden..
* @since 1.3
*/
protected class
AccessibleAWTComponentHandler implements
ComponentListener {
public void
componentHidden(
ComponentEvent e) {
if (
accessibleContext != null) {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
AccessibleState.
VISIBLE, null);
}
}
public void
componentShown(
ComponentEvent e) {
if (
accessibleContext != null) {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
null,
AccessibleState.
VISIBLE);
}
}
public void
componentMoved(
ComponentEvent e) {
}
public void
componentResized(
ComponentEvent e) {
}
} // inner class AccessibleAWTComponentHandler
/**
* Fire PropertyChange listener, if one is registered,
* when focus events happen
* @since 1.3
*/
protected class
AccessibleAWTFocusHandler implements
FocusListener {
public void
focusGained(
FocusEvent event) {
if (
accessibleContext != null) {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
null,
AccessibleState.
FOCUSED);
}
}
public void
focusLost(
FocusEvent event) {
if (
accessibleContext != null) {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
AccessibleState.
FOCUSED, null);
}
}
} // inner class AccessibleAWTFocusHandler
/**
* Adds a <code>PropertyChangeListener</code> to the listener list.
*
* @param listener the property change listener to be added
*/
public void
addPropertyChangeListener(
PropertyChangeListener listener) {
if (
accessibleAWTComponentHandler == null) {
accessibleAWTComponentHandler = new
AccessibleAWTComponentHandler();
}
if (
accessibleAWTFocusHandler == null) {
accessibleAWTFocusHandler = new
AccessibleAWTFocusHandler();
}
if (
propertyListenersCount++ == 0) {
Component.this.
addComponentListener(
accessibleAWTComponentHandler);
Component.this.
addFocusListener(
accessibleAWTFocusHandler);
}
super.addPropertyChangeListener(
listener);
}
/**
* Remove a PropertyChangeListener from the listener list.
* This removes a PropertyChangeListener that was registered
* for all properties.
*
* @param listener The PropertyChangeListener to be removed
*/
public void
removePropertyChangeListener(
PropertyChangeListener listener) {
if (--
propertyListenersCount == 0) {
Component.this.
removeComponentListener(
accessibleAWTComponentHandler);
Component.this.
removeFocusListener(
accessibleAWTFocusHandler);
}
super.removePropertyChangeListener(
listener);
}
// AccessibleContext methods
//
/**
* Gets the accessible name of this object. This should almost never
* return <code>java.awt.Component.getName()</code>,
* as that generally isn't a localized name,
* and doesn't have meaning for the user. If the
* object is fundamentally a text object (e.g. a menu item), the
* accessible name should be the text of the object (e.g. "save").
* If the object has a tooltip, the tooltip text may also be an
* appropriate String to return.
*
* @return the localized name of the object -- can be
* <code>null</code> if this
* object does not have a name
* @see javax.accessibility.AccessibleContext#setAccessibleName
*/
public
String getAccessibleName() {
return
accessibleName;
}
/**
* Gets the accessible description of this object. This should be
* a concise, localized description of what this object is - what
* is its meaning to the user. If the object has a tooltip, the
* tooltip text may be an appropriate string to return, assuming
* it contains a concise description of the object (instead of just
* the name of the object - e.g. a "Save" icon on a toolbar that
* had "save" as the tooltip text shouldn't return the tooltip
* text as the description, but something like "Saves the current
* text document" instead).
*
* @return the localized description of the object -- can be
* <code>null</code> if this object does not have a description
* @see javax.accessibility.AccessibleContext#setAccessibleDescription
*/
public
String getAccessibleDescription() {
return
accessibleDescription;
}
/**
* Gets the role of this object.
*
* @return an instance of <code>AccessibleRole</code>
* describing the role of the object
* @see javax.accessibility.AccessibleRole
*/
public
AccessibleRole getAccessibleRole() {
return
AccessibleRole.
AWT_COMPONENT;
}
/**
* Gets the state of this object.
*
* @return an instance of <code>AccessibleStateSet</code>
* containing the current state set of the object
* @see javax.accessibility.AccessibleState
*/
public
AccessibleStateSet getAccessibleStateSet() {
return
Component.this.
getAccessibleStateSet();
}
/**
* Gets the <code>Accessible</code> parent of this object.
* If the parent of this object implements <code>Accessible</code>,
* this method should simply return <code>getParent</code>.
*
* @return the <code>Accessible</code> parent of this
* object -- can be <code>null</code> if this
* object does not have an <code>Accessible</code> parent
*/
public
Accessible getAccessibleParent() {
if (
accessibleParent != null) {
return
accessibleParent;
} else {
Container parent =
getParent();
if (
parent instanceof
Accessible) {
return (
Accessible)
parent;
}
}
return null;
}
/**
* Gets the index of this object in its accessible parent.
*
* @return the index of this object in its parent; or -1 if this
* object does not have an accessible parent
* @see #getAccessibleParent
*/
public int
getAccessibleIndexInParent() {
return
Component.this.
getAccessibleIndexInParent();
}
/**
* Returns the number of accessible children in the object. If all
* of the children of this object implement <code>Accessible</code>,
* then this method should return the number of children of this object.
*
* @return the number of accessible children in the object
*/
public int
getAccessibleChildrenCount() {
return 0; // Components don't have children
}
/**
* Returns the nth <code>Accessible</code> child of the object.
*
* @param i zero-based index of child
* @return the nth <code>Accessible</code> child of the object
*/
public
Accessible getAccessibleChild(int
i) {
return null; // Components don't have children
}
/**
* Returns the locale of this object.
*
* @return the locale of this object
*/
public
Locale getLocale() {
return
Component.this.
getLocale();
}
/**
* Gets the <code>AccessibleComponent</code> associated
* with this object if one exists.
* Otherwise return <code>null</code>.
*
* @return the component
*/
public
AccessibleComponent getAccessibleComponent() {
return this;
}
// AccessibleComponent methods
//
/**
* Gets the background color of this object.
*
* @return the background color, if supported, of the object;
* otherwise, <code>null</code>
*/
public
Color getBackground() {
return
Component.this.
getBackground();
}
/**
* Sets the background color of this object.
* (For transparency, see <code>isOpaque</code>.)
*
* @param c the new <code>Color</code> for the background
* @see Component#isOpaque
*/
public void
setBackground(
Color c) {
Component.this.
setBackground(
c);
}
/**
* Gets the foreground color of this object.
*
* @return the foreground color, if supported, of the object;
* otherwise, <code>null</code>
*/
public
Color getForeground() {
return
Component.this.
getForeground();
}
/**
* Sets the foreground color of this object.
*
* @param c the new <code>Color</code> for the foreground
*/
public void
setForeground(
Color c) {
Component.this.
setForeground(
c);
}
/**
* Gets the <code>Cursor</code> of this object.
*
* @return the <code>Cursor</code>, if supported,
* of the object; otherwise, <code>null</code>
*/
public
Cursor getCursor() {
return
Component.this.
getCursor();
}
/**
* Sets the <code>Cursor</code> of this object.
* <p>
* The method may have no visual effect if the Java platform
* implementation and/or the native system do not support
* changing the mouse cursor shape.
* @param cursor the new <code>Cursor</code> for the object
*/
public void
setCursor(
Cursor cursor) {
Component.this.
setCursor(
cursor);
}
/**
* Gets the <code>Font</code> of this object.
*
* @return the <code>Font</code>, if supported,
* for the object; otherwise, <code>null</code>
*/
public
Font getFont() {
return
Component.this.
getFont();
}
/**
* Sets the <code>Font</code> of this object.
*
* @param f the new <code>Font</code> for the object
*/
public void
setFont(
Font f) {
Component.this.
setFont(
f);
}
/**
* Gets the <code>FontMetrics</code> of this object.
*
* @param f the <code>Font</code>
* @return the <code>FontMetrics</code>, if supported,
* the object; otherwise, <code>null</code>
* @see #getFont
*/
public
FontMetrics getFontMetrics(
Font f) {
if (
f == null) {
return null;
} else {
return
Component.this.
getFontMetrics(
f);
}
}
/**
* Determines if the object is enabled.
*
* @return true if object is enabled; otherwise, false
*/
public boolean
isEnabled() {
return
Component.this.
isEnabled();
}
/**
* Sets the enabled state of the object.
*
* @param b if true, enables this object; otherwise, disables it
*/
public void
setEnabled(boolean
b) {
boolean
old =
Component.this.
isEnabled();
Component.this.
setEnabled(
b);
if (
b !=
old) {
if (
accessibleContext != null) {
if (
b) {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
null,
AccessibleState.
ENABLED);
} else {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
AccessibleState.
ENABLED, null);
}
}
}
}
/**
* Determines if the object is visible. Note: this means that the
* object intends to be visible; however, it may not in fact be
* showing on the screen because one of the objects that this object
* is contained by is not visible. To determine if an object is
* showing on the screen, use <code>isShowing</code>.
*
* @return true if object is visible; otherwise, false
*/
public boolean
isVisible() {
return
Component.this.
isVisible();
}
/**
* Sets the visible state of the object.
*
* @param b if true, shows this object; otherwise, hides it
*/
public void
setVisible(boolean
b) {
boolean
old =
Component.this.
isVisible();
Component.this.
setVisible(
b);
if (
b !=
old) {
if (
accessibleContext != null) {
if (
b) {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
null,
AccessibleState.
VISIBLE);
} else {
accessibleContext.
firePropertyChange(
AccessibleContext.
ACCESSIBLE_STATE_PROPERTY,
AccessibleState.
VISIBLE, null);
}
}
}
}
/**
* Determines if the object is showing. This is determined by checking
* the visibility of the object and ancestors of the object. Note:
* this will return true even if the object is obscured by another
* (for example, it happens to be underneath a menu that was pulled
* down).
*
* @return true if object is showing; otherwise, false
*/
public boolean
isShowing() {
return
Component.this.
isShowing();
}
/**
* Checks whether the specified point is within this object's bounds,
* where the point's x and y coordinates are defined to be relative to
* the coordinate system of the object.
*
* @param p the <code>Point</code> relative to the
* coordinate system of the object
* @return true if object contains <code>Point</code>; otherwise false
*/
public boolean
contains(
Point p) {
return
Component.this.
contains(
p);
}
/**
* Returns the location of the object on the screen.
*
* @return location of object on screen -- can be
* <code>null</code> if this object is not on the screen
*/
public
Point getLocationOnScreen() {
synchronized (
Component.this.
getTreeLock()) {
if (
Component.this.
isShowing()) {
return
Component.this.
getLocationOnScreen();
} else {
return null;
}
}
}
/**
* Gets the location of the object relative to the parent in the form
* of a point specifying the object's top-left corner in the screen's
* coordinate space.
*
* @return an instance of Point representing the top-left corner of
* the object's bounds in the coordinate space of the screen;
* <code>null</code> if this object or its parent are not on the screen
*/
public
Point getLocation() {
return
Component.this.
getLocation();
}
/**
* Sets the location of the object relative to the parent.
* @param p the coordinates of the object
*/
public void
setLocation(
Point p) {
Component.this.
setLocation(
p);
}
/**
* Gets the bounds of this object in the form of a Rectangle object.
* The bounds specify this object's width, height, and location
* relative to its parent.
*
* @return a rectangle indicating this component's bounds;
* <code>null</code> if this object is not on the screen
*/
public
Rectangle getBounds() {
return
Component.this.
getBounds();
}
/**
* Sets the bounds of this object in the form of a
* <code>Rectangle</code> object.
* The bounds specify this object's width, height, and location
* relative to its parent.
*
* @param r a rectangle indicating this component's bounds
*/
public void
setBounds(
Rectangle r) {
Component.this.
setBounds(
r);
}
/**
* Returns the size of this object in the form of a
* <code>Dimension</code> object. The height field of the
* <code>Dimension</code> object contains this objects's
* height, and the width field of the <code>Dimension</code>
* object contains this object's width.
*
* @return a <code>Dimension</code> object that indicates
* the size of this component; <code>null</code> if
* this object is not on the screen
*/
public
Dimension getSize() {
return
Component.this.
getSize();
}
/**
* Resizes this object so that it has width and height.
*
* @param d - the dimension specifying the new size of the object
*/
public void
setSize(
Dimension d) {
Component.this.
setSize(
d);
}
/**
* Returns the <code>Accessible</code> child,
* if one exists, contained at the local
* coordinate <code>Point</code>. Otherwise returns
* <code>null</code>.
*
* @param p the point defining the top-left corner of
* the <code>Accessible</code>, given in the
* coordinate space of the object's parent
* @return the <code>Accessible</code>, if it exists,
* at the specified location; else <code>null</code>
*/
public
Accessible getAccessibleAt(
Point p) {
return null; // Components don't have children
}
/**
* Returns whether this object can accept focus or not.
*
* @return true if object can accept focus; otherwise false
*/
public boolean
isFocusTraversable() {
return
Component.this.
isFocusTraversable();
}
/**
* Requests focus for this object.
*/
public void
requestFocus() {
Component.this.
requestFocus();
}
/**
* Adds the specified focus listener to receive focus events from this
* component.
*
* @param l the focus listener
*/
public void
addFocusListener(
FocusListener l) {
Component.this.
addFocusListener(
l);
}
/**
* Removes the specified focus listener so it no longer receives focus
* events from this component.
*
* @param l the focus listener
*/
public void
removeFocusListener(
FocusListener l) {
Component.this.
removeFocusListener(
l);
}
} // inner class AccessibleAWTComponent
/**
* Gets the index of this object in its accessible parent.
* If this object does not have an accessible parent, returns
* -1.
*
* @return the index of this object in its accessible parent
*/
int
getAccessibleIndexInParent() {
synchronized (
getTreeLock()) {
int
index = -1;
Container parent = this.
getParent();
if (
parent != null &&
parent instanceof
Accessible) {
Component ca[] =
parent.
getComponents();
for (int
i = 0;
i <
ca.length;
i++) {
if (
ca[
i] instanceof
Accessible) {
index++;
}
if (this.
equals(
ca[
i])) {
return
index;
}
}
}
return -1;
}
}
/**
* Gets the current state set of this object.
*
* @return an instance of <code>AccessibleStateSet</code>
* containing the current state set of the object
* @see AccessibleState
*/
AccessibleStateSet getAccessibleStateSet() {
synchronized (
getTreeLock()) {
AccessibleStateSet states = new
AccessibleStateSet();
if (this.
isEnabled()) {
states.
add(
AccessibleState.
ENABLED);
}
if (this.
isFocusTraversable()) {
states.
add(
AccessibleState.
FOCUSABLE);
}
if (this.
isVisible()) {
states.
add(
AccessibleState.
VISIBLE);
}
if (this.
isShowing()) {
states.
add(
AccessibleState.
SHOWING);
}
if (this.
isFocusOwner()) {
states.
add(
AccessibleState.
FOCUSED);
}
if (this instanceof
Accessible) {
AccessibleContext ac = ((
Accessible) this).
getAccessibleContext();
if (
ac != null) {
Accessible ap =
ac.
getAccessibleParent();
if (
ap != null) {
AccessibleContext pac =
ap.
getAccessibleContext();
if (
pac != null) {
AccessibleSelection as =
pac.
getAccessibleSelection();
if (
as != null) {
states.
add(
AccessibleState.
SELECTABLE);
int
i =
ac.
getAccessibleIndexInParent();
if (
i >= 0) {
if (
as.
isAccessibleChildSelected(
i)) {
states.
add(
AccessibleState.
SELECTED);
}
}
}
}
}
}
}
if (
Component.
isInstanceOf(this, "javax.swing.JComponent")) {
if (((javax.swing.
JComponent) this).
isOpaque()) {
states.
add(
AccessibleState.
OPAQUE);
}
}
return
states;
}
}
/**
* Checks that the given object is instance of the given class.
* @param obj Object to be checked
* @param className The name of the class. Must be fully-qualified class name.
* @return true, if this object is instanceof given class,
* false, otherwise, or if obj or className is null
*/
static boolean
isInstanceOf(
Object obj,
String className) {
if (
obj == null) return false;
if (
className == null) return false;
Class<?>
cls =
obj.
getClass();
while (
cls != null) {
if (
cls.
getName().
equals(
className)) {
return true;
}
cls =
cls.
getSuperclass();
}
return false;
}
// ************************** MIXING CODE *******************************
/**
* Check whether we can trust the current bounds of the component.
* The return value of false indicates that the container of the
* component is invalid, and therefore needs to be layed out, which would
* probably mean changing the bounds of its children.
* Null-layout of the container or absence of the container mean
* the bounds of the component are final and can be trusted.
*/
final boolean
areBoundsValid() {
Container cont =
getContainer();
return
cont == null ||
cont.
isValid() ||
cont.
getLayout() == null;
}
/**
* Applies the shape to the component
* @param shape Shape to be applied to the component
*/
void
applyCompoundShape(
Region shape) {
checkTreeLock();
if (!
areBoundsValid()) {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this + "; areBoundsValid = " +
areBoundsValid());
}
return;
}
if (!
isLightweight()) {
ComponentPeer peer =
getPeer();
if (
peer != null) {
// The Region class has some optimizations. That's why
// we should manually check whether it's empty and
// substitute the object ourselves. Otherwise we end up
// with some incorrect Region object with loX being
// greater than the hiX for instance.
if (
shape.
isEmpty()) {
shape =
Region.
EMPTY_REGION;
}
// Note: the shape is not really copied/cloned. We create
// the Region object ourselves, so there's no any possibility
// to modify the object outside of the mixing code.
// Nullifying compoundShape means that the component has normal shape
// (or has no shape at all).
if (
shape.
equals(
getNormalShape())) {
if (this.
compoundShape == null) {
return;
}
this.
compoundShape = null;
peer.
applyShape(null);
} else {
if (
shape.
equals(
getAppliedShape())) {
return;
}
this.
compoundShape =
shape;
Point compAbsolute =
getLocationOnWindow();
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINER)) {
mixingLog.
fine("this = " + this +
"; compAbsolute=" +
compAbsolute + "; shape=" +
shape);
}
peer.
applyShape(
shape.
getTranslatedRegion(-
compAbsolute.
x, -
compAbsolute.
y));
}
}
}
}
/**
* Returns the shape previously set with applyCompoundShape().
* If the component is LW or no shape was applied yet,
* the method returns the normal shape.
*/
private
Region getAppliedShape() {
checkTreeLock();
//XXX: if we allow LW components to have a shape, this must be changed
return (this.
compoundShape == null ||
isLightweight()) ?
getNormalShape() : this.
compoundShape;
}
Point getLocationOnWindow() {
checkTreeLock();
Point curLocation =
getLocation();
for (
Container parent =
getContainer();
parent != null && !(
parent instanceof
Window);
parent =
parent.
getContainer())
{
curLocation.
x +=
parent.
getX();
curLocation.
y +=
parent.
getY();
}
return
curLocation;
}
/**
* Returns the full shape of the component located in window coordinates
*/
final
Region getNormalShape() {
checkTreeLock();
//XXX: we may take into account a user-specified shape for this component
Point compAbsolute =
getLocationOnWindow();
return
Region.
getInstanceXYWH(
compAbsolute.
x,
compAbsolute.
y,
getWidth(),
getHeight()
);
}
/**
* Returns the "opaque shape" of the component.
*
* The opaque shape of a lightweight components is the actual shape that
* needs to be cut off of the heavyweight components in order to mix this
* lightweight component correctly with them.
*
* The method is overriden in the java.awt.Container to handle non-opaque
* containers containing opaque children.
*
* See 6637655 for details.
*/
Region getOpaqueShape() {
checkTreeLock();
if (
mixingCutoutRegion != null) {
return
mixingCutoutRegion;
} else {
return
getNormalShape();
}
}
final int
getSiblingIndexAbove() {
checkTreeLock();
Container parent =
getContainer();
if (
parent == null) {
return -1;
}
int
nextAbove =
parent.
getComponentZOrder(this) - 1;
return
nextAbove < 0 ? -1 :
nextAbove;
}
final
ComponentPeer getHWPeerAboveMe() {
checkTreeLock();
Container cont =
getContainer();
int
indexAbove =
getSiblingIndexAbove();
while (
cont != null) {
for (int
i =
indexAbove;
i > -1;
i--) {
Component comp =
cont.
getComponent(
i);
if (
comp != null &&
comp.
isDisplayable() && !
comp.
isLightweight()) {
return
comp.
getPeer();
}
}
// traversing the hierarchy up to the closest HW container;
// further traversing may return a component that is not actually
// a native sibling of this component and this kind of z-order
// request may not be allowed by the underlying system (6852051).
if (!
cont.
isLightweight()) {
break;
}
indexAbove =
cont.
getSiblingIndexAbove();
cont =
cont.
getContainer();
}
return null;
}
final int
getSiblingIndexBelow() {
checkTreeLock();
Container parent =
getContainer();
if (
parent == null) {
return -1;
}
int
nextBelow =
parent.
getComponentZOrder(this) + 1;
return
nextBelow >=
parent.
getComponentCount() ? -1 :
nextBelow;
}
final boolean
isNonOpaqueForMixing() {
return
mixingCutoutRegion != null &&
mixingCutoutRegion.
isEmpty();
}
private
Region calculateCurrentShape() {
checkTreeLock();
Region s =
getNormalShape();
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this + "; normalShape=" +
s);
}
if (
getContainer() != null) {
Component comp = this;
Container cont =
comp.
getContainer();
while (
cont != null) {
for (int
index =
comp.
getSiblingIndexAbove();
index != -1; --
index) {
/* It is assumed that:
*
* getComponent(getContainer().getComponentZOrder(comp)) == comp
*
* The assumption has been made according to the current
* implementation of the Container class.
*/
Component c =
cont.
getComponent(
index);
if (
c.
isLightweight() &&
c.
isShowing()) {
s =
s.
getDifference(
c.
getOpaqueShape());
}
}
if (
cont.
isLightweight()) {
s =
s.
getIntersection(
cont.
getNormalShape());
} else {
break;
}
comp =
cont;
cont =
cont.
getContainer();
}
}
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("currentShape=" +
s);
}
return
s;
}
void
applyCurrentShape() {
checkTreeLock();
if (!
areBoundsValid()) {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this + "; areBoundsValid = " +
areBoundsValid());
}
return; // Because applyCompoundShape() ignores such components anyway
}
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this);
}
applyCompoundShape(
calculateCurrentShape());
}
final void
subtractAndApplyShape(
Region s) {
checkTreeLock();
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this + "; s=" +
s);
}
applyCompoundShape(
getAppliedShape().
getDifference(
s));
}
private final void
applyCurrentShapeBelowMe() {
checkTreeLock();
Container parent =
getContainer();
if (
parent != null &&
parent.
isShowing()) {
// First, reapply shapes of my siblings
parent.
recursiveApplyCurrentShape(
getSiblingIndexBelow());
// Second, if my container is non-opaque, reapply shapes of siblings of my container
Container parent2 =
parent.
getContainer();
while (!
parent.
isOpaque() &&
parent2 != null) {
parent2.
recursiveApplyCurrentShape(
parent.
getSiblingIndexBelow());
parent =
parent2;
parent2 =
parent.
getContainer();
}
}
}
final void
subtractAndApplyShapeBelowMe() {
checkTreeLock();
Container parent =
getContainer();
if (
parent != null &&
isShowing()) {
Region opaqueShape =
getOpaqueShape();
// First, cut my siblings
parent.
recursiveSubtractAndApplyShape(
opaqueShape,
getSiblingIndexBelow());
// Second, if my container is non-opaque, cut siblings of my container
Container parent2 =
parent.
getContainer();
while (!
parent.
isOpaque() &&
parent2 != null) {
parent2.
recursiveSubtractAndApplyShape(
opaqueShape,
parent.
getSiblingIndexBelow());
parent =
parent2;
parent2 =
parent.
getContainer();
}
}
}
void
mixOnShowing() {
synchronized (
getTreeLock()) {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this);
}
if (!
isMixingNeeded()) {
return;
}
if (
isLightweight()) {
subtractAndApplyShapeBelowMe();
} else {
applyCurrentShape();
}
}
}
void
mixOnHiding(boolean
isLightweight) {
// We cannot be sure that the peer exists at this point, so we need the argument
// to find out whether the hiding component is (well, actually was) a LW or a HW.
synchronized (
getTreeLock()) {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this + "; isLightweight = " +
isLightweight);
}
if (!
isMixingNeeded()) {
return;
}
if (
isLightweight) {
applyCurrentShapeBelowMe();
}
}
}
void
mixOnReshaping() {
synchronized (
getTreeLock()) {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this);
}
if (!
isMixingNeeded()) {
return;
}
if (
isLightweight()) {
applyCurrentShapeBelowMe();
} else {
applyCurrentShape();
}
}
}
void
mixOnZOrderChanging(int
oldZorder, int
newZorder) {
synchronized (
getTreeLock()) {
boolean
becameHigher =
newZorder <
oldZorder;
Container parent =
getContainer();
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this +
"; oldZorder=" +
oldZorder + "; newZorder=" +
newZorder + "; parent=" +
parent);
}
if (!
isMixingNeeded()) {
return;
}
if (
isLightweight()) {
if (
becameHigher) {
if (
parent != null &&
isShowing()) {
parent.
recursiveSubtractAndApplyShape(
getOpaqueShape(),
getSiblingIndexBelow(),
oldZorder);
}
} else {
if (
parent != null) {
parent.
recursiveApplyCurrentShape(
oldZorder,
newZorder);
}
}
} else {
if (
becameHigher) {
applyCurrentShape();
} else {
if (
parent != null) {
Region shape =
getAppliedShape();
for (int
index =
oldZorder;
index <
newZorder;
index++) {
Component c =
parent.
getComponent(
index);
if (
c.
isLightweight() &&
c.
isShowing()) {
shape =
shape.
getDifference(
c.
getOpaqueShape());
}
}
applyCompoundShape(
shape);
}
}
}
}
}
void
mixOnValidating() {
// This method gets overriden in the Container. Obviously, a plain
// non-container components don't need to handle validation.
}
final boolean
isMixingNeeded() {
if (
SunToolkit.
getSunAwtDisableMixing()) {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINEST)) {
mixingLog.
finest("this = " + this + "; Mixing disabled via sun.awt.disableMixing");
}
return false;
}
if (!
areBoundsValid()) {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this + "; areBoundsValid = " +
areBoundsValid());
}
return false;
}
Window window =
getContainingWindow();
if (
window != null) {
if (!
window.
hasHeavyweightDescendants() || !
window.
hasLightweightDescendants() ||
window.
isDisposing()) {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("containing window = " +
window +
"; has h/w descendants = " +
window.
hasHeavyweightDescendants() +
"; has l/w descendants = " +
window.
hasLightweightDescendants() +
"; disposing = " +
window.
isDisposing());
}
return false;
}
} else {
if (
mixingLog.
isLoggable(
PlatformLogger.
Level.
FINE)) {
mixingLog.
fine("this = " + this + "; containing window is null");
}
return false;
}
return true;
}
// ****************** END OF MIXING CODE ********************************
// Note that the method is overriden in the Window class,
// a window doesn't need to be updated in the Z-order.
void
updateZOrder() {
peer.
setZOrder(
getHWPeerAboveMe());
}
}