/*
* Copyright (c) 1998, 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 javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.
Component;
import java.awt.
Color;
import java.awt.
Rectangle;
import java.io.
Serializable;
import sun.swing.
DefaultLookup;
/**
* Renders an item in a list.
* <p>
* <strong><a name="override">Implementation Note:</a></strong>
* This class overrides
* <code>invalidate</code>,
* <code>validate</code>,
* <code>revalidate</code>,
* <code>repaint</code>,
* <code>isOpaque</code>,
* and
* <code>firePropertyChange</code>
* solely to improve performance.
* If not overridden, these frequently called methods would execute code paths
* that are unnecessary for the default list cell renderer.
* If you write your own renderer,
* take care to weigh the benefits and
* drawbacks of overriding these methods.
*
* <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}.
*
* @author Philip Milne
* @author Hans Muller
*/
public class
DefaultListCellRenderer extends
JLabel
implements
ListCellRenderer<
Object>,
Serializable
{
/**
* An empty <code>Border</code>. This field might not be used. To change the
* <code>Border</code> used by this renderer override the
* <code>getListCellRendererComponent</code> method and set the border
* of the returned component directly.
*/
private static final
Border SAFE_NO_FOCUS_BORDER = new
EmptyBorder(1, 1, 1, 1);
private static final
Border DEFAULT_NO_FOCUS_BORDER = new
EmptyBorder(1, 1, 1, 1);
protected static
Border noFocusBorder =
DEFAULT_NO_FOCUS_BORDER;
/**
* Constructs a default renderer object for an item
* in a list.
*/
public
DefaultListCellRenderer() {
super();
setOpaque(true);
setBorder(
getNoFocusBorder());
setName("List.cellRenderer");
}
private
Border getNoFocusBorder() {
Border border =
DefaultLookup.
getBorder(this,
ui, "List.cellNoFocusBorder");
if (
System.
getSecurityManager() != null) {
if (
border != null) return
border;
return
SAFE_NO_FOCUS_BORDER;
} else {
if (
border != null &&
(
noFocusBorder == null ||
noFocusBorder ==
DEFAULT_NO_FOCUS_BORDER)) {
return
border;
}
return
noFocusBorder;
}
}
public
Component getListCellRendererComponent(
JList<?>
list,
Object value,
int
index,
boolean
isSelected,
boolean
cellHasFocus)
{
setComponentOrientation(
list.
getComponentOrientation());
Color bg = null;
Color fg = null;
JList.
DropLocation dropLocation =
list.
getDropLocation();
if (
dropLocation != null
&& !
dropLocation.
isInsert()
&&
dropLocation.
getIndex() ==
index) {
bg =
DefaultLookup.
getColor(this,
ui, "List.dropCellBackground");
fg =
DefaultLookup.
getColor(this,
ui, "List.dropCellForeground");
isSelected = true;
}
if (
isSelected) {
setBackground(
bg == null ?
list.
getSelectionBackground() :
bg);
setForeground(
fg == null ?
list.
getSelectionForeground() :
fg);
}
else {
setBackground(
list.
getBackground());
setForeground(
list.
getForeground());
}
if (
value instanceof
Icon) {
setIcon((
Icon)
value);
setText("");
}
else {
setIcon(null);
setText((
value == null) ? "" :
value.
toString());
}
setEnabled(
list.
isEnabled());
setFont(
list.
getFont());
Border border = null;
if (
cellHasFocus) {
if (
isSelected) {
border =
DefaultLookup.
getBorder(this,
ui, "List.focusSelectedCellHighlightBorder");
}
if (
border == null) {
border =
DefaultLookup.
getBorder(this,
ui, "List.focusCellHighlightBorder");
}
} else {
border =
getNoFocusBorder();
}
setBorder(
border);
return this;
}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*
* @since 1.5
* @return <code>true</code> if the background is completely opaque
* and differs from the JList's background;
* <code>false</code> otherwise
*/
@
Override
public boolean
isOpaque() {
Color back =
getBackground();
Component p =
getParent();
if (
p != null) {
p =
p.
getParent();
}
// p should now be the JList.
boolean
colorMatch = (
back != null) && (
p != null) &&
back.
equals(
p.
getBackground()) &&
p.
isOpaque();
return !
colorMatch && super.isOpaque();
}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
validate() {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*
* @since 1.5
*/
@
Override
public void
invalidate() {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*
* @since 1.5
*/
@
Override
public void
repaint() {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
revalidate() {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
repaint(long
tm, int
x, int
y, int
width, int
height) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
repaint(
Rectangle r) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
protected void
firePropertyChange(
String propertyName,
Object oldValue,
Object newValue) {
// Strings get interned...
if (
propertyName == "text"
|| ((
propertyName == "font" ||
propertyName == "foreground")
&&
oldValue !=
newValue
&&
getClientProperty(javax.swing.plaf.basic.
BasicHTML.
propertyKey) != null)) {
super.firePropertyChange(
propertyName,
oldValue,
newValue);
}
}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
firePropertyChange(
String propertyName, byte
oldValue, byte
newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
firePropertyChange(
String propertyName, char
oldValue, char
newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
firePropertyChange(
String propertyName, short
oldValue, short
newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
firePropertyChange(
String propertyName, int
oldValue, int
newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
firePropertyChange(
String propertyName, long
oldValue, long
newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
firePropertyChange(
String propertyName, float
oldValue, float
newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
firePropertyChange(
String propertyName, double
oldValue, double
newValue) {}
/**
* Overridden for performance reasons.
* See the <a href="#override">Implementation Note</a>
* for more information.
*/
@
Override
public void
firePropertyChange(
String propertyName, boolean
oldValue, boolean
newValue) {}
/**
* A subclass of DefaultListCellRenderer that implements UIResource.
* DefaultListCellRenderer doesn't implement UIResource
* directly so that applications can safely override the
* cellRenderer property with DefaultListCellRenderer subclasses.
* <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}.
*/
public static class
UIResource extends
DefaultListCellRenderer
implements javax.swing.plaf.
UIResource
{
}
}