/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package javax.swing;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;
import javax.swing.plaf.*;
import javax.accessibility.*;
import java.io.
ObjectOutputStream;
import java.io.
ObjectInputStream;
import java.io.
IOException;
/**
* An implementation of a check box -- an item that can be selected or
* deselected, and which displays its state to the user.
* By convention, any number of check boxes in a group can be selected.
* See <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/button.html">How to Use Buttons, Check Boxes, and Radio Buttons</a>
* in <em>The Java Tutorial</em>
* for examples and information on using check boxes.
* <p>
* Buttons can be configured, and to some degree controlled, by
* <code><a href="Action.html">Action</a></code>s. Using an
* <code>Action</code> with a button has many benefits beyond directly
* configuring a button. Refer to <a href="Action.html#buttonActions">
* Swing Components Supporting <code>Action</code></a> for more
* details, and you can find more information in <a
* href="https://docs.oracle.com/javase/tutorial/uiswing/misc/action.html">How
* to Use Actions</a>, a section in <em>The Java Tutorial</em>.
* <p>
* <strong>Warning:</strong> Swing is not thread safe. For more
* information see <a
* href="package-summary.html#threading">Swing's Threading
* Policy</a>.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*
* @see JRadioButton
*
* @beaninfo
* attribute: isContainer false
* description: A component which can be selected or deselected.
*
* @author Jeff Dinkins
*/
public class
JCheckBox extends
JToggleButton implements
Accessible {
/** Identifies a change to the flat property. */
public static final
String BORDER_PAINTED_FLAT_CHANGED_PROPERTY = "borderPaintedFlat";
private boolean
flat = false;
/**
* @see #getUIClassID
* @see #readObject
*/
private static final
String uiClassID = "CheckBoxUI";
/**
* Creates an initially unselected check box button with no text, no icon.
*/
public
JCheckBox () {
this(null, null, false);
}
/**
* Creates an initially unselected check box with an icon.
*
* @param icon the Icon image to display
*/
public
JCheckBox(
Icon icon) {
this(null,
icon, false);
}
/**
* Creates a check box with an icon and specifies whether
* or not it is initially selected.
*
* @param icon the Icon image to display
* @param selected a boolean value indicating the initial selection
* state. If <code>true</code> the check box is selected
*/
public
JCheckBox(
Icon icon, boolean
selected) {
this(null,
icon,
selected);
}
/**
* Creates an initially unselected check box with text.
*
* @param text the text of the check box.
*/
public
JCheckBox (
String text) {
this(
text, null, false);
}
/**
* Creates a check box where properties are taken from the
* Action supplied.
*
* @since 1.3
*/
public
JCheckBox(
Action a) {
this();
setAction(
a);
}
/**
* Creates a check box with text and specifies whether
* or not it is initially selected.
*
* @param text the text of the check box.
* @param selected a boolean value indicating the initial selection
* state. If <code>true</code> the check box is selected
*/
public
JCheckBox (
String text, boolean
selected) {
this(
text, null,
selected);
}
/**
* Creates an initially unselected check box with
* the specified text and icon.
*
* @param text the text of the check box.
* @param icon the Icon image to display
*/
public
JCheckBox(
String text,
Icon icon) {
this(
text,
icon, false);
}
/**
* Creates a check box with text and icon,
* and specifies whether or not it is initially selected.
*
* @param text the text of the check box.
* @param icon the Icon image to display
* @param selected a boolean value indicating the initial selection
* state. If <code>true</code> the check box is selected
*/
public
JCheckBox (
String text,
Icon icon, boolean
selected) {
super(
text,
icon,
selected);
setUIProperty("borderPainted",
Boolean.
FALSE);
setHorizontalAlignment(
LEADING);
}
/**
* Sets the <code>borderPaintedFlat</code> property,
* which gives a hint to the look and feel as to the
* appearance of the check box border.
* This is usually set to <code>true</code> when a
* <code>JCheckBox</code> instance is used as a
* renderer in a component such as a <code>JTable</code> or
* <code>JTree</code>. The default value for the
* <code>borderPaintedFlat</code> property is <code>false</code>.
* This method fires a property changed event.
* Some look and feels might not implement flat borders;
* they will ignore this property.
*
* @param b <code>true</code> requests that the border be painted flat;
* <code>false</code> requests normal borders
* @see #isBorderPaintedFlat
* @beaninfo
* bound: true
* attribute: visualUpdate true
* description: Whether the border is painted flat.
* @since 1.3
*/
public void
setBorderPaintedFlat(boolean
b) {
boolean
oldValue =
flat;
flat =
b;
firePropertyChange(
BORDER_PAINTED_FLAT_CHANGED_PROPERTY,
oldValue,
flat);
if (
b !=
oldValue) {
revalidate();
repaint();
}
}
/**
* Gets the value of the <code>borderPaintedFlat</code> property.
*
* @return the value of the <code>borderPaintedFlat</code> property
* @see #setBorderPaintedFlat
* @since 1.3
*/
public boolean
isBorderPaintedFlat() {
return
flat;
}
/**
* Resets the UI property to a value from the current look and feel.
*
* @see JComponent#updateUI
*/
public void
updateUI() {
setUI((
ButtonUI)
UIManager.
getUI(this));
}
/**
* Returns a string that specifies the name of the L&F class
* that renders this component.
*
* @return the string "CheckBoxUI"
* @see JComponent#getUIClassID
* @see UIDefaults#getUI
* @beaninfo
* expert: true
* description: A string that specifies the name of the L&F class
*/
public
String getUIClassID() {
return
uiClassID;
}
/**
* The icon for checkboxs comes from the look and feel,
* not the Action; this is overriden to do nothing.
*/
void
setIconFromAction(
Action a) {
}
/*
* See readObject and writeObject in JComponent for more
* information about serialization in Swing.
*/
private void
writeObject(
ObjectOutputStream s) throws
IOException {
s.
defaultWriteObject();
if (
getUIClassID().
equals(
uiClassID)) {
byte
count =
JComponent.
getWriteObjCounter(this);
JComponent.
setWriteObjCounter(this, --
count);
if (
count == 0 &&
ui != null) {
ui.
installUI(this);
}
}
}
/**
* See JComponent.readObject() for information about serialization
* in Swing.
*/
private void
readObject(
ObjectInputStream s)
throws
IOException,
ClassNotFoundException
{
s.
defaultReadObject();
if (
getUIClassID().
equals(
uiClassID)) {
updateUI();
}
}
/**
* Returns a string representation of this JCheckBox. 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>.
* specific new aspects of the JFC components.
*
* @return a string representation of this JCheckBox.
*/
protected
String paramString() {
return super.paramString();
}
/////////////////
// Accessibility support
////////////////
/**
* Gets the AccessibleContext associated with this JCheckBox.
* For JCheckBoxes, the AccessibleContext takes the form of an
* AccessibleJCheckBox.
* A new AccessibleJCheckBox instance is created if necessary.
*
* @return an AccessibleJCheckBox that serves as the
* AccessibleContext of this JCheckBox
* @beaninfo
* expert: true
* description: The AccessibleContext associated with this CheckBox.
*/
public
AccessibleContext getAccessibleContext() {
if (
accessibleContext == null) {
accessibleContext = new
AccessibleJCheckBox();
}
return
accessibleContext;
}
/**
* This class implements accessibility support for the
* <code>JCheckBox</code> class. It provides an implementation of the
* Java Accessibility API appropriate to check box user-interface
* elements.
* <p>
* <strong>Warning:</strong>
* Serialized objects of this class will not be compatible with
* future Swing releases. The current serialization support is
* appropriate for short term storage or RMI between applications running
* the same version of Swing. As of 1.4, support for long term storage
* of all JavaBeans™
* has been added to the <code>java.beans</code> package.
* Please see {@link java.beans.XMLEncoder}.
*/
protected class
AccessibleJCheckBox extends
AccessibleJToggleButton {
/**
* Get the role of this object.
*
* @return an instance of AccessibleRole describing the role of the object
* @see AccessibleRole
*/
public
AccessibleRole getAccessibleRole() {
return
AccessibleRole.
CHECK_BOX;
}
} // inner class AccessibleJCheckBox
}