349 lines
11 KiB
Java
349 lines
11 KiB
Java
/*
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* Copyright 1998-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package javax.swing;
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import javax.swing.*;
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import javax.swing.event.*;
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import javax.swing.border.*;
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import java.awt.Component;
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import java.awt.Color;
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import java.awt.Rectangle;
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import java.io.Serializable;
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import sun.swing.DefaultLookup;
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/**
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* Renders an item in a list.
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* <p>
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* <strong><a name="override">Implementation Note:</a></strong>
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* This class overrides
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* <code>invalidate</code>,
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* <code>validate</code>,
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* <code>revalidate</code>,
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* <code>repaint</code>,
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* <code>isOpaque</code>,
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* and
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* <code>firePropertyChange</code>
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* solely to improve performance.
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* If not overridden, these frequently called methods would execute code paths
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* that are unnecessary for the default list cell renderer.
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* If you write your own renderer,
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* take care to weigh the benefits and
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* drawbacks of overriding these methods.
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*
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* <p>
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*
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* <strong>Warning:</strong>
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* Serialized objects of this class will not be compatible with
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* future Swing releases. The current serialization support is
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* appropriate for short term storage or RMI between applications running
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* the same version of Swing. As of 1.4, support for long term storage
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* of all JavaBeans<sup><font size="-2">TM</font></sup>
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* has been added to the <code>java.beans</code> package.
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* Please see {@link java.beans.XMLEncoder}.
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*
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* @author Philip Milne
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* @author Hans Muller
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*/
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public class DefaultListCellRenderer extends JLabel
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implements ListCellRenderer, Serializable
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{
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/**
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* An empty <code>Border</code>. This field might not be used. To change the
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* <code>Border</code> used by this renderer override the
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* <code>getListCellRendererComponent</code> method and set the border
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* of the returned component directly.
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*/
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private static final Border SAFE_NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1);
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private static final Border DEFAULT_NO_FOCUS_BORDER = new EmptyBorder(1, 1, 1, 1);
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protected static Border noFocusBorder = DEFAULT_NO_FOCUS_BORDER;
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/**
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* Constructs a default renderer object for an item
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* in a list.
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*/
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public DefaultListCellRenderer() {
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super();
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setOpaque(true);
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setBorder(getNoFocusBorder());
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setName("List.cellRenderer");
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}
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private Border getNoFocusBorder() {
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Border border = DefaultLookup.getBorder(this, ui, "List.cellNoFocusBorder");
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if (System.getSecurityManager() != null) {
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if (border != null) return border;
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return SAFE_NO_FOCUS_BORDER;
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} else {
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if (border != null &&
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(noFocusBorder == null ||
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noFocusBorder == DEFAULT_NO_FOCUS_BORDER)) {
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return border;
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}
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return noFocusBorder;
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}
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}
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public Component getListCellRendererComponent(
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JList list,
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Object value,
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int index,
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boolean isSelected,
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boolean cellHasFocus)
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{
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setComponentOrientation(list.getComponentOrientation());
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Color bg = null;
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Color fg = null;
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JList.DropLocation dropLocation = list.getDropLocation();
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if (dropLocation != null
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&& !dropLocation.isInsert()
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&& dropLocation.getIndex() == index) {
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bg = DefaultLookup.getColor(this, ui, "List.dropCellBackground");
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fg = DefaultLookup.getColor(this, ui, "List.dropCellForeground");
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isSelected = true;
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}
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if (isSelected) {
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setBackground(bg == null ? list.getSelectionBackground() : bg);
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setForeground(fg == null ? list.getSelectionForeground() : fg);
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}
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else {
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setBackground(list.getBackground());
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setForeground(list.getForeground());
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}
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if (value instanceof Icon) {
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setIcon((Icon)value);
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setText("");
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}
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else {
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setIcon(null);
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setText((value == null) ? "" : value.toString());
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}
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setEnabled(list.isEnabled());
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setFont(list.getFont());
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Border border = null;
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if (cellHasFocus) {
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if (isSelected) {
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border = DefaultLookup.getBorder(this, ui, "List.focusSelectedCellHighlightBorder");
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}
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if (border == null) {
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border = DefaultLookup.getBorder(this, ui, "List.focusCellHighlightBorder");
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}
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} else {
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border = getNoFocusBorder();
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}
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setBorder(border);
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return this;
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}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*
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* @since 1.5
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* @return <code>true</code> if the background is completely opaque
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* and differs from the JList's background;
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* <code>false</code> otherwise
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*/
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@Override
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public boolean isOpaque() {
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Color back = getBackground();
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Component p = getParent();
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if (p != null) {
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p = p.getParent();
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}
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// p should now be the JList.
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boolean colorMatch = (back != null) && (p != null) &&
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back.equals(p.getBackground()) &&
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p.isOpaque();
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return !colorMatch && super.isOpaque();
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}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void validate() {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*
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* @since 1.5
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*/
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@Override
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public void invalidate() {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*
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* @since 1.5
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*/
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@Override
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public void repaint() {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void revalidate() {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void repaint(long tm, int x, int y, int width, int height) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void repaint(Rectangle r) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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protected void firePropertyChange(String propertyName, Object oldValue, Object newValue) {
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// Strings get interned...
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if (propertyName == "text"
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|| ((propertyName == "font" || propertyName == "foreground")
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&& oldValue != newValue
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&& getClientProperty(javax.swing.plaf.basic.BasicHTML.propertyKey) != null)) {
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super.firePropertyChange(propertyName, oldValue, newValue);
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}
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}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void firePropertyChange(String propertyName, byte oldValue, byte newValue) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void firePropertyChange(String propertyName, char oldValue, char newValue) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void firePropertyChange(String propertyName, short oldValue, short newValue) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void firePropertyChange(String propertyName, int oldValue, int newValue) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void firePropertyChange(String propertyName, long oldValue, long newValue) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void firePropertyChange(String propertyName, float oldValue, float newValue) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void firePropertyChange(String propertyName, double oldValue, double newValue) {}
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/**
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* Overridden for performance reasons.
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* See the <a href="#override">Implementation Note</a>
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* for more information.
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*/
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@Override
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public void firePropertyChange(String propertyName, boolean oldValue, boolean newValue) {}
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/**
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* A subclass of DefaultListCellRenderer that implements UIResource.
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* DefaultListCellRenderer doesn't implement UIResource
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* directly so that applications can safely override the
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* cellRenderer property with DefaultListCellRenderer subclasses.
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* <p>
|
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* <strong>Warning:</strong>
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* Serialized objects of this class will not be compatible with
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* future Swing releases. The current serialization support is
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* appropriate for short term storage or RMI between applications running
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* the same version of Swing. As of 1.4, support for long term storage
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* of all JavaBeans<sup><font size="-2">TM</font></sup>
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* has been added to the <code>java.beans</code> package.
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* Please see {@link java.beans.XMLEncoder}.
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*/
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public static class UIResource extends DefaultListCellRenderer
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implements javax.swing.plaf.UIResource
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{
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}
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}
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