My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

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	1	/*
	2	* Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	4	*
	5	* This code is free software; you can redistribute it and/or modify it
	6	* under the terms of the GNU General Public License version 2 only, as
	7	* published by the Free Software Foundation. Oracle designates this
	8	* particular file as subject to the "Classpath" exception as provided
	9	* by Oracle in the LICENSE file that accompanied this code.
	10	*
	11	* This code is distributed in the hope that it will be useful, but WITHOUT
	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	14	* version 2 for more details (a copy is included in the LICENSE file that
	15	* accompanied this code).
	16	*
	17	* You should have received a copy of the GNU General Public License version
	18	* 2 along with this work; if not, write to the Free Software Foundation,
	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	20	*
	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	22	* or visit www.oracle.com if you need additional information or have any
	23	* questions.
	24	*/
	25
	26	package javax.swing;
	27
	28	import java.awt.*;
	29	import java.awt.event.*;
	30	import java.beans.*;
	31	import java.io.*;
	32	import java.util.*;
	33	import javax.swing.event.*;
	34	import javax.swing.plaf.*;
	35	import javax.swing.tree.*;
	36	import javax.swing.text.Position;
	37	import javax.accessibility.*;
	38	import sun.swing.SwingUtilities2;
	39	import sun.swing.SwingUtilities2.Section;
	40	import static sun.swing.SwingUtilities2.Section.*;
	41
	42
	43	/**
	44	* <a name="jtree_description">
	45	* A control that displays a set of hierarchical data as an outline.
	46	* You can find task-oriented documentation and examples of using trees in
	47	* <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/tree.html">How to Use Trees</a>,
	48	* a section in <em>The Java Tutorial.</em>
	49	* <p>
	50	* A specific node in a tree can be identified either by a
	51	* <code>TreePath</code> (an object
	52	* that encapsulates a node and all of its ancestors), or by its
	53	* display row, where each row in the display area displays one node.
	54	* An <i>expanded</i> node is a non-leaf node (as identified by
	55	* <code>TreeModel.isLeaf(node)</code> returning false) that will displays
	56	* its children when all its ancestors are <i>expanded</i>.
	57	* A <i>collapsed</i>
	58	* node is one which hides them. A <i>hidden</i> node is one which is
	59	* under a collapsed ancestor. All of a <i>viewable</i> nodes parents
	60	* are expanded, but may or may not be displayed. A <i>displayed</i> node
	61	* is both viewable and in the display area, where it can be seen.
	62	* <p>
	63	* The following <code>JTree</code> methods use "visible" to mean "displayed":
	64	* <ul>
	65	* <li><code>isRootVisible()</code>
	66	* <li><code>setRootVisible()</code>
	67	* <li><code>scrollPathToVisible()</code>
	68	* <li><code>scrollRowToVisible()</code>
	69	* <li><code>getVisibleRowCount()</code>
	70	* <li><code>setVisibleRowCount()</code>
	71	* </ul>
	72	* <p>
	73	* The next group of <code>JTree</code> methods use "visible" to mean
	74	* "viewable" (under an expanded parent):
	75	* <ul>
	76	* <li><code>isVisible()</code>
	77	* <li><code>makeVisible()</code>
	78	* </ul>
	79	* <p>
	80	* If you are interested in knowing when the selection changes implement
	81	* the <code>TreeSelectionListener</code> interface and add the instance
	82	* using the method <code>addTreeSelectionListener</code>.
	83	* <code>valueChanged</code> will be invoked when the
	84	* selection changes, that is if the user clicks twice on the same
	85	* node <code>valueChanged</code> will only be invoked once.
	86	* <p>
	87	* If you are interested in detecting either double-click events or when
	88	* a user clicks on a node, regardless of whether or not it was selected,
	89	* we recommend you do the following:
	90	* <pre>
	91	* final JTree tree = ...;
	92	*
	93	* MouseListener ml = new MouseAdapter() {
	94	* public void <b>mousePressed</b>(MouseEvent e) {
	95	* int selRow = tree.getRowForLocation(e.getX(), e.getY());
	96	* TreePath selPath = tree.getPathForLocation(e.getX(), e.getY());
	97	* if(selRow != -1) {
	98	* if(e.getClickCount() == 1) {
	99	* mySingleClick(selRow, selPath);
	100	* }
	101	* else if(e.getClickCount() == 2) {
	102	* myDoubleClick(selRow, selPath);
	103	* }
	104	* }
	105	* }
	106	* };
	107	* tree.addMouseListener(ml);
	108	* </pre>
	109	* NOTE: This example obtains both the path and row, but you only need to
	110	* get the one you're interested in.
	111	* <p>
	112	* To use <code>JTree</code> to display compound nodes
	113	* (for example, nodes containing both
	114	* a graphic icon and text), subclass {@link TreeCellRenderer} and use
	115	* {@link #setCellRenderer} to tell the tree to use it. To edit such nodes,
	116	* subclass {@link TreeCellEditor} and use {@link #setCellEditor}.
	117	* <p>
	118	* Like all <code>JComponent</code> classes, you can use {@link InputMap} and
	119	* {@link ActionMap}
	120	* to associate an {@link Action} object with a {@link KeyStroke}
	121	* and execute the action under specified conditions.
	122	* <p>
	123	* <strong>Warning:</strong> Swing is not thread safe. For more
	124	* information see <a
	125	* href="package-summary.html#threading">Swing's Threading
	126	* Policy</a>.
	127	* <p>
	128	* <strong>Warning:</strong>
	129	* Serialized objects of this class will not be compatible with
	130	* future Swing releases. The current serialization support is
	131	* appropriate for short term storage or RMI between applications running
	132	* the same version of Swing. As of 1.4, support for long term storage
	133	* of all JavaBeans<sup><font size="-2">TM</font></sup>
	134	* has been added to the <code>java.beans</code> package.
	135	* Please see {@link java.beans.XMLEncoder}.
	136	*
	137	* @beaninfo
	138	* attribute: isContainer false
	139	* description: A component that displays a set of hierarchical data as an outline.
	140	*
	141	* @author Rob Davis
	142	* @author Ray Ryan
	143	* @author Scott Violet
	144	*/
	145	public class JTree extends JComponent implements Scrollable, Accessible
	146	{
	147	/**
	148	* @see #getUIClassID
	149	* @see #readObject
	150	*/
	151	private static final String uiClassID = "TreeUI";
	152
	153	/**
	154	* The model that defines the tree displayed by this object.
	155	*/
	156	transient protected TreeModel treeModel;
	157
	158	/**
	159	* Models the set of selected nodes in this tree.
	160	*/
	161	transient protected TreeSelectionModel selectionModel;
	162
	163	/**
	164	* True if the root node is displayed, false if its children are
	165	* the highest visible nodes.
	166	*/
	167	protected boolean rootVisible;
	168
	169	/**
	170	* The cell used to draw nodes. If <code>null</code>, the UI uses a default
	171	* <code>cellRenderer</code>.
	172	*/
	173	transient protected TreeCellRenderer cellRenderer;
	174
	175	/**
	176	* Height to use for each display row. If this is <= 0 the renderer
	177	* determines the height for each row.
	178	*/
	179	protected int rowHeight;
	180	private boolean rowHeightSet = false;
	181
	182	/**
	183	* Maps from <code>TreePath</code> to <code>Boolean</code>
	184	* indicating whether or not the
	185	* particular path is expanded. This ONLY indicates whether a
	186	* given path is expanded, and NOT if it is visible or not. That
	187	* information must be determined by visiting all the parent
	188	* paths and seeing if they are visible.
	189	*/
	190	transient private Hashtable<TreePath, Boolean> expandedState;
	191
	192
	193	/**
	194	* True if handles are displayed at the topmost level of the tree.
	195	* <p>
	196	* A handle is a small icon that displays adjacent to the node which
	197	* allows the user to click once to expand or collapse the node. A
	198	* common interface shows a plus sign (+) for a node which can be
	199	* expanded and a minus sign (-) for a node which can be collapsed.
	200	* Handles are always shown for nodes below the topmost level.
	201	* <p>
	202	* If the <code>rootVisible</code> setting specifies that the root
	203	* node is to be displayed, then that is the only node at the topmost
	204	* level. If the root node is not displayed, then all of its
	205	* children are at the topmost level of the tree. Handles are
	206	* always displayed for nodes other than the topmost.
	207	* <p>
	208	* If the root node isn't visible, it is generally a good to make
	209	* this value true. Otherwise, the tree looks exactly like a list,
	210	* and users may not know that the "list entries" are actually
	211	* tree nodes.
	212	*
	213	* @see #rootVisible
	214	*/
	215	protected boolean showsRootHandles;
	216	private boolean showsRootHandlesSet = false;
	217
	218	/**
	219	* Creates a new event and passed it off the
	220	* <code>selectionListeners</code>.
	221	*/
	222	protected transient TreeSelectionRedirector selectionRedirector;
	223
	224	/**
	225	* Editor for the entries. Default is <code>null</code>
	226	* (tree is not editable).
	227	*/
	228	transient protected TreeCellEditor cellEditor;
	229
	230	/**
	231	* Is the tree editable? Default is false.
	232	*/
	233	protected boolean editable;
	234
	235	/**
	236	* Is this tree a large model? This is a code-optimization setting.
	237	* A large model can be used when the cell height is the same for all
	238	* nodes. The UI will then cache very little information and instead
	239	* continually message the model. Without a large model the UI caches
	240	* most of the information, resulting in fewer method calls to the model.
	241	* <p>
	242	* This value is only a suggestion to the UI. Not all UIs will
	243	* take advantage of it. Default value is false.
	244	*/
	245	protected boolean largeModel;
	246
	247	/**
	248	* Number of rows to make visible at one time. This value is used for
	249	* the <code>Scrollable</code> interface. It determines the preferred
	250	* size of the display area.
	251	*/
	252	protected int visibleRowCount;
	253
	254	/**
	255	* If true, when editing is to be stopped by way of selection changing,
	256	* data in tree changing or other means <code>stopCellEditing</code>
	257	* is invoked, and changes are saved. If false,
	258	* <code>cancelCellEditing</code> is invoked, and changes
	259	* are discarded. Default is false.
	260	*/
	261	protected boolean invokesStopCellEditing;
	262
	263	/**
	264	* If true, when a node is expanded, as many of the descendants are
	265	* scrolled to be visible.
	266	*/
	267	protected boolean scrollsOnExpand;
	268	private boolean scrollsOnExpandSet = false;
	269
	270	/**
	271	* Number of mouse clicks before a node is expanded.
	272	*/
	273	protected int toggleClickCount;
	274
	275	/**
	276	* Updates the <code>expandedState</code>.
	277	*/
	278	transient protected TreeModelListener treeModelListener;
	279
	280	/**
	281	* Used when <code>setExpandedState</code> is invoked,
	282	* will be a <code>Stack</code> of <code>Stack</code>s.
	283	*/
	284	transient private Stack<Stack<TreePath>> expandedStack;
	285
	286	/**
	287	* Lead selection path, may not be <code>null</code>.
	288	*/
	289	private TreePath leadPath;
	290
	291	/**
	292	* Anchor path.
	293	*/
	294	private TreePath anchorPath;
	295
	296	/**
	297	* True if paths in the selection should be expanded.
	298	*/
	299	private boolean expandsSelectedPaths;
	300
	301	/**
	302	* This is set to true for the life of the <code>setUI</code> call.
	303	*/
	304	private boolean settingUI;
	305
	306	/** If true, mouse presses on selections initiate a drag operation. */
	307	private boolean dragEnabled;
	308
	309	/**
	310	* The drop mode for this component.
	311	*/
	312	private DropMode dropMode = DropMode.USE_SELECTION;
	313
	314	/**
	315	* The drop location.
	316	*/
	317	private transient DropLocation dropLocation;
	318
	319	/**
	320	* A subclass of <code>TransferHandler.DropLocation</code> representing
	321	* a drop location for a <code>JTree</code>.
	322	*
	323	* @see #getDropLocation
	324	* @since 1.6
	325	*/
	326	public static final class DropLocation extends TransferHandler.DropLocation {
	327	private final TreePath path;
	328	private final int index;
	329
	330	private DropLocation(Point p, TreePath path, int index) {
	331	super(p);
	332	this.path = path;
	333	this.index = index;
	334	}
	335
	336	/**
	337	* Returns the index where the dropped data should be inserted
	338	* with respect to the path returned by <code>getPath()</code>.
	339	* <p>
	340	* For drop modes <code>DropMode.USE_SELECTION</code> and
	341	* <code>DropMode.ON</code>, this index is unimportant (and it will
	342	* always be <code>-1</code>) as the only interesting data is the
	343	* path over which the drop operation occurred.
	344	* <p>
	345	* For drop mode <code>DropMode.INSERT</code>, this index
	346	* indicates the index at which the data should be inserted into
	347	* the parent path represented by <code>getPath()</code>.
	348	* <code>-1</code> indicates that the drop occurred over the
	349	* parent itself, and in most cases should be treated as inserting
	350	* into either the beginning or the end of the parent's list of
	351	* children.
	352	* <p>
	353	* For <code>DropMode.ON_OR_INSERT</code>, this value will be
	354	* an insert index, as described above, or <code>-1</code> if
	355	* the drop occurred over the path itself.
	356	*
	357	* @return the child index
	358	* @see #getPath
	359	*/
	360	public int getChildIndex() {
	361	return index;
	362	}
	363
	364	/**
	365	* Returns the path where dropped data should be placed in the
	366	* tree.
	367	* <p>
	368	* Interpretation of this value depends on the drop mode set on the
	369	* component. If the drop mode is <code>DropMode.USE_SELECTION</code>
	370	* or <code>DropMode.ON</code>, the return value is the path in the
	371	* tree over which the data has been (or will be) dropped.
	372	* <code>null</code> indicates that the drop is over empty space,
	373	* not associated with a particular path.
	374	* <p>
	375	* If the drop mode is <code>DropMode.INSERT</code>, the return value
	376	* refers to the path that should become the parent of the new data,
	377	* in which case <code>getChildIndex()</code> indicates where the
	378	* new item should be inserted into this parent path. A
	379	* <code>null</code> path indicates that no parent path has been
	380	* determined, which can happen for multiple reasons:
	381	* <ul>
	382	* <li>The tree has no model
	383	* <li>There is no root in the tree
	384	* <li>The root is collapsed
	385	* <li>The root is a leaf node
	386	* </ul>
	387	* It is up to the developer to decide if and how they wish to handle
	388	* the <code>null</code> case.
	389	* <p>
	390	* If the drop mode is <code>DropMode.ON_OR_INSERT</code>,
	391	* <code>getChildIndex</code> can be used to determine whether the
	392	* drop is on top of the path itself (<code>-1</code>) or the index
	393	* at which it should be inserted into the path (values other than
	394	* <code>-1</code>).
	395	*
	396	* @return the drop path
	397	* @see #getChildIndex
	398	*/
	399	public TreePath getPath() {
	400	return path;
	401	}
	402
	403	/**
	404	* Returns a string representation of this drop location.
	405	* This method is intended to be used for debugging purposes,
	406	* and the content and format of the returned string may vary
	407	* between implementations.
	408	*
	409	* @return a string representation of this drop location
	410	*/
	411	public String toString() {
	412	return getClass().getName()
	413	+ "[dropPoint=" + getDropPoint() + ","
	414	+ "path=" + path + ","
	415	+ "childIndex=" + index + "]";
	416	}
	417	}
	418
	419	/**
	420	* The row to expand during DnD.
	421	*/
	422	private int expandRow = -1;
	423
	424	private class TreeTimer extends Timer {
	425	public TreeTimer() {
	426	super(2000, null);
	427	setRepeats(false);
	428	}
	429
	430	public void fireActionPerformed(ActionEvent ae) {
	431	JTree.this.expandRow(expandRow);
	432	}
	433	}
	434
	435	/**
	436	* A timer to expand nodes during drop.
	437	*/
	438	private TreeTimer dropTimer;
	439
	440	/**
	441	* When <code>addTreeExpansionListener</code> is invoked,
	442	* and <code>settingUI</code> is true, this ivar gets set to the passed in
	443	* <code>Listener</code>. This listener is then notified first in
	444	* <code>fireTreeCollapsed</code> and <code>fireTreeExpanded</code>.
	445	* <p>This is an ugly workaround for a way to have the UI listener
	446	* get notified before other listeners.
	447	*/
	448	private transient TreeExpansionListener uiTreeExpansionListener;
	449
	450	/**
	451	* Max number of stacks to keep around.
	452	*/
	453	private static int TEMP_STACK_SIZE = 11;
	454
	455	//
	456	// Bound property names
	457	//
	458	/** Bound property name for <code>cellRenderer</code>. */
	459	public final static String CELL_RENDERER_PROPERTY = "cellRenderer";
	460	/** Bound property name for <code>treeModel</code>. */
	461	public final static String TREE_MODEL_PROPERTY = "model";
	462	/** Bound property name for <code>rootVisible</code>. */
	463	public final static String ROOT_VISIBLE_PROPERTY = "rootVisible";
	464	/** Bound property name for <code>showsRootHandles</code>. */
	465	public final static String SHOWS_ROOT_HANDLES_PROPERTY = "showsRootHandles";
	466	/** Bound property name for <code>rowHeight</code>. */
	467	public final static String ROW_HEIGHT_PROPERTY = "rowHeight";
	468	/** Bound property name for <code>cellEditor</code>. */
	469	public final static String CELL_EDITOR_PROPERTY = "cellEditor";
	470	/** Bound property name for <code>editable</code>. */
	471	public final static String EDITABLE_PROPERTY = "editable";
	472	/** Bound property name for <code>largeModel</code>. */
	473	public final static String LARGE_MODEL_PROPERTY = "largeModel";
	474	/** Bound property name for selectionModel. */
	475	public final static String SELECTION_MODEL_PROPERTY = "selectionModel";
	476	/** Bound property name for <code>visibleRowCount</code>. */
	477	public final static String VISIBLE_ROW_COUNT_PROPERTY = "visibleRowCount";
	478	/** Bound property name for <code>messagesStopCellEditing</code>. */
	479	public final static String INVOKES_STOP_CELL_EDITING_PROPERTY = "invokesStopCellEditing";
	480	/** Bound property name for <code>scrollsOnExpand</code>. */
	481	public final static String SCROLLS_ON_EXPAND_PROPERTY = "scrollsOnExpand";
	482	/** Bound property name for <code>toggleClickCount</code>. */
	483	public final static String TOGGLE_CLICK_COUNT_PROPERTY = "toggleClickCount";
	484	/** Bound property name for <code>leadSelectionPath</code>.
	485	* @since 1.3 */
	486	public final static String LEAD_SELECTION_PATH_PROPERTY = "leadSelectionPath";
	487	/** Bound property name for anchor selection path.
	488	* @since 1.3 */
	489	public final static String ANCHOR_SELECTION_PATH_PROPERTY = "anchorSelectionPath";
	490	/** Bound property name for expands selected paths property
	491	* @since 1.3 */
	492	public final static String EXPANDS_SELECTED_PATHS_PROPERTY = "expandsSelectedPaths";
	493
	494
	495	/**
	496	* Creates and returns a sample <code>TreeModel</code>.
	497	* Used primarily for beanbuilders to show something interesting.
	498	*
	499	* @return the default <code>TreeModel</code>
	500	*/
	501	protected static TreeModel getDefaultTreeModel() {
	502	DefaultMutableTreeNode root = new DefaultMutableTreeNode("JTree");
	503	DefaultMutableTreeNode parent;
	504
	505	parent = new DefaultMutableTreeNode("colors");
	506	root.add(parent);
	507	parent.add(new DefaultMutableTreeNode("blue"));
	508	parent.add(new DefaultMutableTreeNode("violet"));
	509	parent.add(new DefaultMutableTreeNode("red"));
	510	parent.add(new DefaultMutableTreeNode("yellow"));
	511
	512	parent = new DefaultMutableTreeNode("sports");
	513	root.add(parent);
	514	parent.add(new DefaultMutableTreeNode("basketball"));
	515	parent.add(new DefaultMutableTreeNode("soccer"));
	516	parent.add(new DefaultMutableTreeNode("football"));
	517	parent.add(new DefaultMutableTreeNode("hockey"));
	518
	519	parent = new DefaultMutableTreeNode("food");
	520	root.add(parent);
	521	parent.add(new DefaultMutableTreeNode("hot dogs"));
	522	parent.add(new DefaultMutableTreeNode("pizza"));
	523	parent.add(new DefaultMutableTreeNode("ravioli"));
	524	parent.add(new DefaultMutableTreeNode("bananas"));
	525	return new DefaultTreeModel(root);
	526	}
	527
	528	/**
	529	* Returns a <code>TreeModel</code> wrapping the specified object.
	530	* If the object is:<ul>
	531	* <li>an array of <code>Object</code>s,
	532	* <li>a <code>Hashtable</code>, or
	533	* <li>a <code>Vector</code>
	534	* </ul>then a new root node is created with each of the incoming
	535	* objects as children. Otherwise, a new root is created with
	536	* a value of {@code "root"}.
	537	*
	538	* @param value the <code>Object</code> used as the foundation for
	539	* the <code>TreeModel</code>
	540	* @return a <code>TreeModel</code> wrapping the specified object
	541	*/
	542	protected static TreeModel createTreeModel(Object value) {
	543	DefaultMutableTreeNode root;
	544
	545	if((value instanceof Object[]) \|\| (value instanceof Hashtable) \|\|
	546	(value instanceof Vector)) {
	547	root = new DefaultMutableTreeNode("root");
	548	DynamicUtilTreeNode.createChildren(root, value);
	549	}
	550	else {
	551	root = new DynamicUtilTreeNode("root", value);
	552	}
	553	return new DefaultTreeModel(root, false);
	554	}
	555
	556	/**
	557	* Returns a <code>JTree</code> with a sample model.
	558	* The default model used by the tree defines a leaf node as any node
	559	* without children.
	560	*
	561	* @see DefaultTreeModel#asksAllowsChildren
	562	*/
	563	public JTree() {
	564	this(getDefaultTreeModel());
	565	}
	566
	567	/**
	568	* Returns a <code>JTree</code> with each element of the
	569	* specified array as the
	570	* child of a new root node which is not displayed.
	571	* By default, the tree defines a leaf node as any node without
	572	* children.
	573	*
	574	* @param value an array of <code>Object</code>s
	575	* @see DefaultTreeModel#asksAllowsChildren
	576	*/
	577	public JTree(Object[] value) {
	578	this(createTreeModel(value));
	579	this.setRootVisible(false);
	580	this.setShowsRootHandles(true);
	581	expandRoot();
	582	}
	583
	584	/**
	585	* Returns a <code>JTree</code> with each element of the specified
	586	* <code>Vector</code> as the
	587	* child of a new root node which is not displayed. By default, the
	588	* tree defines a leaf node as any node without children.
	589	*
	590	* @param value a <code>Vector</code>
	591	* @see DefaultTreeModel#asksAllowsChildren
	592	*/
	593	public JTree(Vector<?> value) {
	594	this(createTreeModel(value));
	595	this.setRootVisible(false);
	596	this.setShowsRootHandles(true);
	597	expandRoot();
	598	}
	599
	600	/**
	601	* Returns a <code>JTree</code> created from a <code>Hashtable</code>
	602	* which does not display with root.
	603	* Each value-half of the key/value pairs in the <code>HashTable</code>
	604	* becomes a child of the new root node. By default, the tree defines
	605	* a leaf node as any node without children.
	606	*
	607	* @param value a <code>Hashtable</code>
	608	* @see DefaultTreeModel#asksAllowsChildren
	609	*/
	610	public JTree(Hashtable<?,?> value) {
	611	this(createTreeModel(value));
	612	this.setRootVisible(false);
	613	this.setShowsRootHandles(true);
	614	expandRoot();
	615	}
	616
	617	/**
	618	* Returns a <code>JTree</code> with the specified
	619	* <code>TreeNode</code> as its root,
	620	* which displays the root node.
	621	* By default, the tree defines a leaf node as any node without children.
	622	*
	623	* @param root a <code>TreeNode</code> object
	624	* @see DefaultTreeModel#asksAllowsChildren
	625	*/
	626	public JTree(TreeNode root) {
	627	this(root, false);
	628	}
	629
	630	/**
	631	* Returns a <code>JTree</code> with the specified <code>TreeNode</code>
	632	* as its root, which
	633	* displays the root node and which decides whether a node is a
	634	* leaf node in the specified manner.
	635	*
	636	* @param root a <code>TreeNode</code> object
	637	* @param asksAllowsChildren if false, any node without children is a
	638	* leaf node; if true, only nodes that do not allow
	639	* children are leaf nodes
	640	* @see DefaultTreeModel#asksAllowsChildren
	641	*/
	642	public JTree(TreeNode root, boolean asksAllowsChildren) {
	643	this(new DefaultTreeModel(root, asksAllowsChildren));
	644	}
	645
	646	/**
	647	* Returns an instance of <code>JTree</code> which displays the root node
	648	* -- the tree is created using the specified data model.
	649	*
	650	* @param newModel the <code>TreeModel</code> to use as the data model
	651	*/
	652	@ConstructorProperties({"model"})
	653	public JTree(TreeModel newModel) {
	654	super();
	655	expandedStack = new Stack<Stack<TreePath>>();
	656	toggleClickCount = 2;
	657	expandedState = new Hashtable<TreePath, Boolean>();
	658	setLayout(null);
	659	rowHeight = 16;
	660	visibleRowCount = 20;
	661	rootVisible = true;
	662	selectionModel = new DefaultTreeSelectionModel();
	663	cellRenderer = null;
	664	scrollsOnExpand = true;
	665	setOpaque(true);
	666	expandsSelectedPaths = true;
	667	updateUI();
	668	setModel(newModel);
	669	}
	670
	671	/**
	672	* Returns the L&F object that renders this component.
	673	*
	674	* @return the <code>TreeUI</code> object that renders this component
	675	*/
	676	public TreeUI getUI() {
	677	return (TreeUI)ui;
	678	}
	679
	680	/**
	681	* Sets the L&F object that renders this component.
	682	* <p>
	683	* This is a bound property.
	684	*
	685	* @param ui the <code>TreeUI</code> L&F object
	686	* @see UIDefaults#getUI
	687	* @beaninfo
	688	* bound: true
	689	* hidden: true
	690	* attribute: visualUpdate true
	691	* description: The UI object that implements the Component's LookAndFeel.
	692	*/
	693	public void setUI(TreeUI ui) {
	694	if (this.ui != ui) {
	695	settingUI = true;
	696	uiTreeExpansionListener = null;
	697	try {
	698	super.setUI(ui);
	699	}
	700	finally {
	701	settingUI = false;
	702	}
	703	}
	704	}
	705
	706	/**
	707	* Notification from the <code>UIManager</code> that the L&F has changed.
	708	* Replaces the current UI object with the latest version from the
	709	* <code>UIManager</code>.
	710	*
	711	* @see JComponent#updateUI
	712	*/
	713	public void updateUI() {
	714	setUI((TreeUI)UIManager.getUI(this));
	715
	716	SwingUtilities.updateRendererOrEditorUI(getCellRenderer());
	717	SwingUtilities.updateRendererOrEditorUI(getCellEditor());
	718	}
	719
	720
	721	/**
	722	* Returns the name of the L&F class that renders this component.
	723	*
	724	* @return the string "TreeUI"
	725	* @see JComponent#getUIClassID
	726	* @see UIDefaults#getUI
	727	*/
	728	public String getUIClassID() {
	729	return uiClassID;
	730	}
	731
	732
	733	/**
	734	* Returns the current <code>TreeCellRenderer</code>
	735	* that is rendering each cell.
	736	*
	737	* @return the <code>TreeCellRenderer</code> that is rendering each cell
	738	*/
	739	public TreeCellRenderer getCellRenderer() {
	740	return cellRenderer;
	741	}
	742
	743	/**
	744	* Sets the <code>TreeCellRenderer</code> that will be used to
	745	* draw each cell.
	746	* <p>
	747	* This is a bound property.
	748	*
	749	* @param x the <code>TreeCellRenderer</code> that is to render each cell
	750	* @beaninfo
	751	* bound: true
	752	* description: The TreeCellRenderer that will be used to draw
	753	* each cell.
	754	*/
	755	public void setCellRenderer(TreeCellRenderer x) {
	756	TreeCellRenderer oldValue = cellRenderer;
	757
	758	cellRenderer = x;
	759	firePropertyChange(CELL_RENDERER_PROPERTY, oldValue, cellRenderer);
	760	invalidate();
	761	}
	762
	763	/**
	764	* Determines whether the tree is editable. Fires a property
	765	* change event if the new setting is different from the existing
	766	* setting.
	767	* <p>
	768	* This is a bound property.
	769	*
	770	* @param flag a boolean value, true if the tree is editable
	771	* @beaninfo
	772	* bound: true
	773	* description: Whether the tree is editable.
	774	*/
	775	public void setEditable(boolean flag) {
	776	boolean oldValue = this.editable;
	777
	778	this.editable = flag;
	779	firePropertyChange(EDITABLE_PROPERTY, oldValue, flag);
	780	if (accessibleContext != null) {
	781	accessibleContext.firePropertyChange(
	782	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	783	(oldValue ? AccessibleState.EDITABLE : null),
	784	(flag ? AccessibleState.EDITABLE : null));
	785	}
	786	}
	787
	788	/**
	789	* Returns true if the tree is editable.
	790	*
	791	* @return true if the tree is editable
	792	*/
	793	public boolean isEditable() {
	794	return editable;
	795	}
	796
	797	/**
	798	* Sets the cell editor. A <code>null</code> value implies that the
	799	* tree cannot be edited. If this represents a change in the
	800	* <code>cellEditor</code>, the <code>propertyChange</code>
	801	* method is invoked on all listeners.
	802	* <p>
	803	* This is a bound property.
	804	*
	805	* @param cellEditor the <code>TreeCellEditor</code> to use
	806	* @beaninfo
	807	* bound: true
	808	* description: The cell editor. A null value implies the tree
	809	* cannot be edited.
	810	*/
	811	public void setCellEditor(TreeCellEditor cellEditor) {
	812	TreeCellEditor oldEditor = this.cellEditor;
	813
	814	this.cellEditor = cellEditor;
	815	firePropertyChange(CELL_EDITOR_PROPERTY, oldEditor, cellEditor);
	816	invalidate();
	817	}
	818
	819	/**
	820	* Returns the editor used to edit entries in the tree.
	821	*
	822	* @return the <code>TreeCellEditor</code> in use,
	823	* or <code>null</code> if the tree cannot be edited
	824	*/
	825	public TreeCellEditor getCellEditor() {
	826	return cellEditor;
	827	}
	828
	829	/**
	830	* Returns the <code>TreeModel</code> that is providing the data.
	831	*
	832	* @return the <code>TreeModel</code> that is providing the data
	833	*/
	834	public TreeModel getModel() {
	835	return treeModel;
	836	}
	837
	838	/**
	839	* Sets the <code>TreeModel</code> that will provide the data.
	840	* <p>
	841	* This is a bound property.
	842	*
	843	* @param newModel the <code>TreeModel</code> that is to provide the data
	844	* @beaninfo
	845	* bound: true
	846	* description: The TreeModel that will provide the data.
	847	*/
	848	public void setModel(TreeModel newModel) {
	849	clearSelection();
	850
	851	TreeModel oldModel = treeModel;
	852
	853	if(treeModel != null && treeModelListener != null)
	854	treeModel.removeTreeModelListener(treeModelListener);
	855
	856	if (accessibleContext != null) {
	857	if (treeModel != null) {
	858	treeModel.removeTreeModelListener((TreeModelListener)accessibleContext);
	859	}
	860	if (newModel != null) {
	861	newModel.addTreeModelListener((TreeModelListener)accessibleContext);
	862	}
	863	}
	864
	865	treeModel = newModel;
	866	clearToggledPaths();
	867	if(treeModel != null) {
	868	if(treeModelListener == null)
	869	treeModelListener = createTreeModelListener();
	870	if(treeModelListener != null)
	871	treeModel.addTreeModelListener(treeModelListener);
	872	// Mark the root as expanded, if it isn't a leaf.
	873	if(treeModel.getRoot() != null &&
	874	!treeModel.isLeaf(treeModel.getRoot())) {
	875	expandedState.put(new TreePath(treeModel.getRoot()),
	876	Boolean.TRUE);
	877	}
	878	}
	879	firePropertyChange(TREE_MODEL_PROPERTY, oldModel, treeModel);
	880	invalidate();
	881	}
	882
	883	/**
	884	* Returns true if the root node of the tree is displayed.
	885	*
	886	* @return true if the root node of the tree is displayed
	887	* @see #rootVisible
	888	*/
	889	public boolean isRootVisible() {
	890	return rootVisible;
	891	}
	892
	893	/**
	894	* Determines whether or not the root node from
	895	* the <code>TreeModel</code> is visible.
	896	* <p>
	897	* This is a bound property.
	898	*
	899	* @param rootVisible true if the root node of the tree is to be displayed
	900	* @see #rootVisible
	901	* @beaninfo
	902	* bound: true
	903	* description: Whether or not the root node
	904	* from the TreeModel is visible.
	905	*/
	906	public void setRootVisible(boolean rootVisible) {
	907	boolean oldValue = this.rootVisible;
	908
	909	this.rootVisible = rootVisible;
	910	firePropertyChange(ROOT_VISIBLE_PROPERTY, oldValue, this.rootVisible);
	911	if (accessibleContext != null) {
	912	((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
	913	}
	914	}
	915
	916	/**
	917	* Sets the value of the <code>showsRootHandles</code> property,
	918	* which specifies whether the node handles should be displayed.
	919	* The default value of this property depends on the constructor
	920	* used to create the <code>JTree</code>.
	921	* Some look and feels might not support handles;
	922	* they will ignore this property.
	923	* <p>
	924	* This is a bound property.
	925	*
	926	* @param newValue <code>true</code> if root handles should be displayed;
	927	* otherwise, <code>false</code>
	928	* @see #showsRootHandles
	929	* @see #getShowsRootHandles
	930	* @beaninfo
	931	* bound: true
	932	* description: Whether the node handles are to be
	933	* displayed.
	934	*/
	935	public void setShowsRootHandles(boolean newValue) {
	936	boolean oldValue = showsRootHandles;
	937	TreeModel model = getModel();
	938
	939	showsRootHandles = newValue;
	940	showsRootHandlesSet = true;
	941	firePropertyChange(SHOWS_ROOT_HANDLES_PROPERTY, oldValue,
	942	showsRootHandles);
	943	if (accessibleContext != null) {
	944	((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
	945	}
	946	invalidate();
	947	}
	948
	949	/**
	950	* Returns the value of the <code>showsRootHandles</code> property.
	951	*
	952	* @return the value of the <code>showsRootHandles</code> property
	953	* @see #showsRootHandles
	954	*/
	955	public boolean getShowsRootHandles()
	956	{
	957	return showsRootHandles;
	958	}
	959
	960	/**
	961	* Sets the height of each cell, in pixels. If the specified value
	962	* is less than or equal to zero the current cell renderer is
	963	* queried for each row's height.
	964	* <p>
	965	* This is a bound property.
	966	*
	967	* @param rowHeight the height of each cell, in pixels
	968	* @beaninfo
	969	* bound: true
	970	* description: The height of each cell.
	971	*/
	972	public void setRowHeight(int rowHeight)
	973	{
	974	int oldValue = this.rowHeight;
	975
	976	this.rowHeight = rowHeight;
	977	rowHeightSet = true;
	978	firePropertyChange(ROW_HEIGHT_PROPERTY, oldValue, this.rowHeight);
	979	invalidate();
	980	}
	981
	982	/**
	983	* Returns the height of each row. If the returned value is less than
	984	* or equal to 0 the height for each row is determined by the
	985	* renderer.
	986	*
	987	*/
	988	public int getRowHeight()
	989	{
	990	return rowHeight;
	991	}
	992
	993	/**
	994	* Returns true if the height of each display row is a fixed size.
	995	*
	996	* @return true if the height of each row is a fixed size
	997	*/
	998	public boolean isFixedRowHeight()
	999	{
	1000	return (rowHeight > 0);
	1001	}
	1002
	1003	/**
	1004	* Specifies whether the UI should use a large model.
	1005	* (Not all UIs will implement this.) Fires a property change
	1006	* for the LARGE_MODEL_PROPERTY.
	1007	* <p>
	1008	* This is a bound property.
	1009	*
	1010	* @param newValue true to suggest a large model to the UI
	1011	* @see #largeModel
	1012	* @beaninfo
	1013	* bound: true
	1014	* description: Whether the UI should use a
	1015	* large model.
	1016	*/
	1017	public void setLargeModel(boolean newValue) {
	1018	boolean oldValue = largeModel;
	1019
	1020	largeModel = newValue;
	1021	firePropertyChange(LARGE_MODEL_PROPERTY, oldValue, newValue);
	1022	}
	1023
	1024	/**
	1025	* Returns true if the tree is configured for a large model.
	1026	*
	1027	* @return true if a large model is suggested
	1028	* @see #largeModel
	1029	*/
	1030	public boolean isLargeModel() {
	1031	return largeModel;
	1032	}
	1033
	1034	/**
	1035	* Determines what happens when editing is interrupted by selecting
	1036	* another node in the tree, a change in the tree's data, or by some
	1037	* other means. Setting this property to <code>true</code> causes the
	1038	* changes to be automatically saved when editing is interrupted.
	1039	* <p>
	1040	* Fires a property change for the INVOKES_STOP_CELL_EDITING_PROPERTY.
	1041	*
	1042	* @param newValue true means that <code>stopCellEditing</code> is invoked
	1043	* when editing is interrupted, and data is saved; false means that
	1044	* <code>cancelCellEditing</code> is invoked, and changes are lost
	1045	* @beaninfo
	1046	* bound: true
	1047	* description: Determines what happens when editing is interrupted,
	1048	* selecting another node in the tree, a change in the
	1049	* tree's data, or some other means.
	1050	*/
	1051	public void setInvokesStopCellEditing(boolean newValue) {
	1052	boolean oldValue = invokesStopCellEditing;
	1053
	1054	invokesStopCellEditing = newValue;
	1055	firePropertyChange(INVOKES_STOP_CELL_EDITING_PROPERTY, oldValue,
	1056	newValue);
	1057	}
	1058
	1059	/**
	1060	* Returns the indicator that tells what happens when editing is
	1061	* interrupted.
	1062	*
	1063	* @return the indicator that tells what happens when editing is
	1064	* interrupted
	1065	* @see #setInvokesStopCellEditing
	1066	*/
	1067	public boolean getInvokesStopCellEditing() {
	1068	return invokesStopCellEditing;
	1069	}
	1070
	1071	/**
	1072	* Sets the <code>scrollsOnExpand</code> property,
	1073	* which determines whether the
	1074	* tree might scroll to show previously hidden children.
	1075	* If this property is <code>true</code> (the default),
	1076	* when a node expands
	1077	* the tree can use scrolling to make
	1078	* the maximum possible number of the node's descendants visible.
	1079	* In some look and feels, trees might not need to scroll when expanded;
	1080	* those look and feels will ignore this property.
	1081	* <p>
	1082	* This is a bound property.
	1083	*
	1084	* @param newValue <code>false</code> to disable scrolling on expansion;
	1085	* <code>true</code> to enable it
	1086	* @see #getScrollsOnExpand
	1087	*
	1088	* @beaninfo
	1089	* bound: true
	1090	* description: Indicates if a node descendant should be scrolled when expanded.
	1091	*/
	1092	public void setScrollsOnExpand(boolean newValue) {
	1093	boolean oldValue = scrollsOnExpand;
	1094
	1095	scrollsOnExpand = newValue;
	1096	scrollsOnExpandSet = true;
	1097	firePropertyChange(SCROLLS_ON_EXPAND_PROPERTY, oldValue,
	1098	newValue);
	1099	}
	1100
	1101	/**
	1102	* Returns the value of the <code>scrollsOnExpand</code> property.
	1103	*
	1104	* @return the value of the <code>scrollsOnExpand</code> property
	1105	*/
	1106	public boolean getScrollsOnExpand() {
	1107	return scrollsOnExpand;
	1108	}
	1109
	1110	/**
	1111	* Sets the number of mouse clicks before a node will expand or close.
	1112	* The default is two.
	1113	* <p>
	1114	* This is a bound property.
	1115	*
	1116	* @since 1.3
	1117	* @beaninfo
	1118	* bound: true
	1119	* description: Number of clicks before a node will expand/collapse.
	1120	*/
	1121	public void setToggleClickCount(int clickCount) {
	1122	int oldCount = toggleClickCount;
	1123
	1124	toggleClickCount = clickCount;
	1125	firePropertyChange(TOGGLE_CLICK_COUNT_PROPERTY, oldCount,
	1126	clickCount);
	1127	}
	1128
	1129	/**
	1130	* Returns the number of mouse clicks needed to expand or close a node.
	1131	*
	1132	* @return number of mouse clicks before node is expanded
	1133	* @since 1.3
	1134	*/
	1135	public int getToggleClickCount() {
	1136	return toggleClickCount;
	1137	}
	1138
	1139	/**
	1140	* Configures the <code>expandsSelectedPaths</code> property. If
	1141	* true, any time the selection is changed, either via the
	1142	* <code>TreeSelectionModel</code>, or the cover methods provided by
	1143	* <code>JTree</code>, the <code>TreePath</code>s parents will be
	1144	* expanded to make them visible (visible meaning the parent path is
	1145	* expanded, not necessarily in the visible rectangle of the
	1146	* <code>JTree</code>). If false, when the selection
	1147	* changes the nodes parent is not made visible (all its parents expanded).
	1148	* This is useful if you wish to have your selection model maintain paths
	1149	* that are not always visible (all parents expanded).
	1150	* <p>
	1151	* This is a bound property.
	1152	*
	1153	* @param newValue the new value for <code>expandsSelectedPaths</code>
	1154	*
	1155	* @since 1.3
	1156	* @beaninfo
	1157	* bound: true
	1158	* description: Indicates whether changes to the selection should make
	1159	* the parent of the path visible.
	1160	*/
	1161	public void setExpandsSelectedPaths(boolean newValue) {
	1162	boolean oldValue = expandsSelectedPaths;
	1163
	1164	expandsSelectedPaths = newValue;
	1165	firePropertyChange(EXPANDS_SELECTED_PATHS_PROPERTY, oldValue,
	1166	newValue);
	1167	}
	1168
	1169	/**
	1170	* Returns the <code>expandsSelectedPaths</code> property.
	1171	* @return true if selection changes result in the parent path being
	1172	* expanded
	1173	* @since 1.3
	1174	* @see #setExpandsSelectedPaths
	1175	*/
	1176	public boolean getExpandsSelectedPaths() {
	1177	return expandsSelectedPaths;
	1178	}
	1179
	1180	/**
	1181	* Turns on or off automatic drag handling. In order to enable automatic
	1182	* drag handling, this property should be set to {@code true}, and the
	1183	* tree's {@code TransferHandler} needs to be {@code non-null}.
	1184	* The default value of the {@code dragEnabled} property is {@code false}.
	1185	* <p>
	1186	* The job of honoring this property, and recognizing a user drag gesture,
	1187	* lies with the look and feel implementation, and in particular, the tree's
	1188	* {@code TreeUI}. When automatic drag handling is enabled, most look and
	1189	* feels (including those that subclass {@code BasicLookAndFeel}) begin a
	1190	* drag and drop operation whenever the user presses the mouse button over
	1191	* an item and then moves the mouse a few pixels. Setting this property to
	1192	* {@code true} can therefore have a subtle effect on how selections behave.
	1193	* <p>
	1194	* If a look and feel is used that ignores this property, you can still
	1195	* begin a drag and drop operation by calling {@code exportAsDrag} on the
	1196	* tree's {@code TransferHandler}.
	1197	*
	1198	* @param b whether or not to enable automatic drag handling
	1199	* @exception HeadlessException if
	1200	* <code>b</code> is <code>true</code> and
	1201	* <code>GraphicsEnvironment.isHeadless()</code>
	1202	* returns <code>true</code>
	1203	* @see java.awt.GraphicsEnvironment#isHeadless
	1204	* @see #getDragEnabled
	1205	* @see #setTransferHandler
	1206	* @see TransferHandler
	1207	* @since 1.4
	1208	*
	1209	* @beaninfo
	1210	* description: determines whether automatic drag handling is enabled
	1211	* bound: false
	1212	*/
	1213	public void setDragEnabled(boolean b) {
	1214	if (b && GraphicsEnvironment.isHeadless()) {
	1215	throw new HeadlessException();
	1216	}
	1217	dragEnabled = b;
	1218	}
	1219
	1220	/**
	1221	* Returns whether or not automatic drag handling is enabled.
	1222	*
	1223	* @return the value of the {@code dragEnabled} property
	1224	* @see #setDragEnabled
	1225	* @since 1.4
	1226	*/
	1227	public boolean getDragEnabled() {
	1228	return dragEnabled;
	1229	}
	1230
	1231	/**
	1232	* Sets the drop mode for this component. For backward compatibility,
	1233	* the default for this property is <code>DropMode.USE_SELECTION</code>.
	1234	* Usage of one of the other modes is recommended, however, for an
	1235	* improved user experience. <code>DropMode.ON</code>, for instance,
	1236	* offers similar behavior of showing items as selected, but does so without
	1237	* affecting the actual selection in the tree.
	1238	* <p>
	1239	* <code>JTree</code> supports the following drop modes:
	1240	* <ul>
	1241	* <li><code>DropMode.USE_SELECTION</code></li>
	1242	* <li><code>DropMode.ON</code></li>
	1243	* <li><code>DropMode.INSERT</code></li>
	1244	* <li><code>DropMode.ON_OR_INSERT</code></li>
	1245	* </ul>
	1246	* <p>
	1247	* The drop mode is only meaningful if this component has a
	1248	* <code>TransferHandler</code> that accepts drops.
	1249	*
	1250	* @param dropMode the drop mode to use
	1251	* @throws IllegalArgumentException if the drop mode is unsupported
	1252	* or <code>null</code>
	1253	* @see #getDropMode
	1254	* @see #getDropLocation
	1255	* @see #setTransferHandler
	1256	* @see TransferHandler
	1257	* @since 1.6
	1258	*/
	1259	public final void setDropMode(DropMode dropMode) {
	1260	if (dropMode != null) {
	1261	switch (dropMode) {
	1262	case USE_SELECTION:
	1263	case ON:
	1264	case INSERT:
	1265	case ON_OR_INSERT:
	1266	this.dropMode = dropMode;
	1267	return;
	1268	}
	1269	}
	1270
	1271	throw new IllegalArgumentException(dropMode + ": Unsupported drop mode for tree");
	1272	}
	1273
	1274	/**
	1275	* Returns the drop mode for this component.
	1276	*
	1277	* @return the drop mode for this component
	1278	* @see #setDropMode
	1279	* @since 1.6
	1280	*/
	1281	public final DropMode getDropMode() {
	1282	return dropMode;
	1283	}
	1284
	1285	/**
	1286	* Calculates a drop location in this component, representing where a
	1287	* drop at the given point should insert data.
	1288	*
	1289	* @param p the point to calculate a drop location for
	1290	* @return the drop location, or <code>null</code>
	1291	*/
	1292	DropLocation dropLocationForPoint(Point p) {
	1293	DropLocation location = null;
	1294
	1295	int row = getClosestRowForLocation(p.x, p.y);
	1296	Rectangle bounds = getRowBounds(row);
	1297	TreeModel model = getModel();
	1298	Object root = (model == null) ? null : model.getRoot();
	1299	TreePath rootPath = (root == null) ? null : new TreePath(root);
	1300
	1301	TreePath child;
	1302	TreePath parent;
	1303	boolean outside = row == -1
	1304	\|\| p.y < bounds.y
	1305	\|\| p.y >= bounds.y + bounds.height;
	1306
	1307	switch(dropMode) {
	1308	case USE_SELECTION:
	1309	case ON:
	1310	if (outside) {
	1311	location = new DropLocation(p, null, -1);
	1312	} else {
	1313	location = new DropLocation(p, getPathForRow(row), -1);
	1314	}
	1315
	1316	break;
	1317	case INSERT:
	1318	case ON_OR_INSERT:
	1319	if (row == -1) {
	1320	if (root != null && !model.isLeaf(root) && isExpanded(rootPath)) {
	1321	location = new DropLocation(p, rootPath, 0);
	1322	} else {
	1323	location = new DropLocation(p, null, -1);
	1324	}
	1325
	1326	break;
	1327	}
	1328
	1329	boolean checkOn = dropMode == DropMode.ON_OR_INSERT
	1330	\|\| !model.isLeaf(getPathForRow(row).getLastPathComponent());
	1331
	1332	Section section = SwingUtilities2.liesInVertical(bounds, p, checkOn);
	1333	if(section == LEADING) {
	1334	child = getPathForRow(row);
	1335	parent = child.getParentPath();
	1336	} else if (section == TRAILING) {
	1337	int index = row + 1;
	1338	if (index >= getRowCount()) {
	1339	if (model.isLeaf(root) \|\| !isExpanded(rootPath)) {
	1340	location = new DropLocation(p, null, -1);
	1341	} else {
	1342	parent = rootPath;
	1343	index = model.getChildCount(root);
	1344	location = new DropLocation(p, parent, index);
	1345	}
	1346
	1347	break;
	1348	}
	1349
	1350	child = getPathForRow(index);
	1351	parent = child.getParentPath();
	1352	} else {
	1353	assert checkOn;
	1354	location = new DropLocation(p, getPathForRow(row), -1);
	1355	break;
	1356	}
	1357
	1358	if (parent != null) {
	1359	location = new DropLocation(p, parent,
	1360	model.getIndexOfChild(parent.getLastPathComponent(),
	1361	child.getLastPathComponent()));
	1362	} else if (checkOn \|\| !model.isLeaf(root)) {
	1363	location = new DropLocation(p, rootPath, -1);
	1364	} else {
	1365	location = new DropLocation(p, null, -1);
	1366	}
	1367
	1368	break;
	1369	default:
	1370	assert false : "Unexpected drop mode";
	1371	}
	1372
	1373	if (outside \|\| row != expandRow) {
	1374	cancelDropTimer();
	1375	}
	1376
	1377	if (!outside && row != expandRow) {
	1378	if (isCollapsed(row)) {
	1379	expandRow = row;
	1380	startDropTimer();
	1381	}
	1382	}
	1383
	1384	return location;
	1385	}
	1386
	1387	/**
	1388	* Called to set or clear the drop location during a DnD operation.
	1389	* In some cases, the component may need to use it's internal selection
	1390	* temporarily to indicate the drop location. To help facilitate this,
	1391	* this method returns and accepts as a parameter a state object.
	1392	* This state object can be used to store, and later restore, the selection
	1393	* state. Whatever this method returns will be passed back to it in
	1394	* future calls, as the state parameter. If it wants the DnD system to
	1395	* continue storing the same state, it must pass it back every time.
	1396	* Here's how this is used:
	1397	* <p>
	1398	* Let's say that on the first call to this method the component decides
	1399	* to save some state (because it is about to use the selection to show
	1400	* a drop index). It can return a state object to the caller encapsulating
	1401	* any saved selection state. On a second call, let's say the drop location
	1402	* is being changed to something else. The component doesn't need to
	1403	* restore anything yet, so it simply passes back the same state object
	1404	* to have the DnD system continue storing it. Finally, let's say this
	1405	* method is messaged with <code>null</code>. This means DnD
	1406	* is finished with this component for now, meaning it should restore
	1407	* state. At this point, it can use the state parameter to restore
	1408	* said state, and of course return <code>null</code> since there's
	1409	* no longer anything to store.
	1410	*
	1411	* @param location the drop location (as calculated by
	1412	* <code>dropLocationForPoint</code>) or <code>null</code>
	1413	* if there's no longer a valid drop location
	1414	* @param state the state object saved earlier for this component,
	1415	* or <code>null</code>
	1416	* @param forDrop whether or not the method is being called because an
	1417	* actual drop occurred
	1418	* @return any saved state for this component, or <code>null</code> if none
	1419	*/
	1420	Object setDropLocation(TransferHandler.DropLocation location,
	1421	Object state,
	1422	boolean forDrop) {
	1423
	1424	Object retVal = null;
	1425	DropLocation treeLocation = (DropLocation)location;
	1426
	1427	if (dropMode == DropMode.USE_SELECTION) {
	1428	if (treeLocation == null) {
	1429	if (!forDrop && state != null) {
	1430	setSelectionPaths(((TreePath[][])state)[0]);
	1431	setAnchorSelectionPath(((TreePath[][])state)[1][0]);
	1432	setLeadSelectionPath(((TreePath[][])state)[1][1]);
	1433	}
	1434	} else {
	1435	if (dropLocation == null) {
	1436	TreePath[] paths = getSelectionPaths();
	1437	if (paths == null) {
	1438	paths = new TreePath[0];
	1439	}
	1440
	1441	retVal = new TreePath[][] {paths,
	1442	{getAnchorSelectionPath(), getLeadSelectionPath()}};
	1443	} else {
	1444	retVal = state;
	1445	}
	1446
	1447	setSelectionPath(treeLocation.getPath());
	1448	}
	1449	}
	1450
	1451	DropLocation old = dropLocation;
	1452	dropLocation = treeLocation;
	1453	firePropertyChange("dropLocation", old, dropLocation);
	1454
	1455	return retVal;
	1456	}
	1457
	1458	/**
	1459	* Called to indicate to this component that DnD is done.
	1460	* Allows for us to cancel the expand timer.
	1461	*/
	1462	void dndDone() {
	1463	cancelDropTimer();
	1464	dropTimer = null;
	1465	}
	1466
	1467	/**
	1468	* Returns the location that this component should visually indicate
	1469	* as the drop location during a DnD operation over the component,
	1470	* or {@code null} if no location is to currently be shown.
	1471	* <p>
	1472	* This method is not meant for querying the drop location
	1473	* from a {@code TransferHandler}, as the drop location is only
	1474	* set after the {@code TransferHandler}'s <code>canImport</code>
	1475	* has returned and has allowed for the location to be shown.
	1476	* <p>
	1477	* When this property changes, a property change event with
	1478	* name "dropLocation" is fired by the component.
	1479	*
	1480	* @return the drop location
	1481	* @see #setDropMode
	1482	* @see TransferHandler#canImport(TransferHandler.TransferSupport)
	1483	* @since 1.6
	1484	*/
	1485	public final DropLocation getDropLocation() {
	1486	return dropLocation;
	1487	}
	1488
	1489	private void startDropTimer() {
	1490	if (dropTimer == null) {
	1491	dropTimer = new TreeTimer();
	1492	}
	1493	dropTimer.start();
	1494	}
	1495
	1496	private void cancelDropTimer() {
	1497	if (dropTimer != null && dropTimer.isRunning()) {
	1498	expandRow = -1;
	1499	dropTimer.stop();
	1500	}
	1501	}
	1502
	1503	/**
	1504	* Returns <code>isEditable</code>. This is invoked from the UI before
	1505	* editing begins to insure that the given path can be edited. This
	1506	* is provided as an entry point for subclassers to add filtered
	1507	* editing without having to resort to creating a new editor.
	1508	*
	1509	* @return true if every parent node and the node itself is editable
	1510	* @see #isEditable
	1511	*/
	1512	public boolean isPathEditable(TreePath path) {
	1513	return isEditable();
	1514	}
	1515
	1516	/**
	1517	* Overrides <code>JComponent</code>'s <code>getToolTipText</code>
	1518	* method in order to allow
	1519	* renderer's tips to be used if it has text set.
	1520	* <p>
	1521	* NOTE: For <code>JTree</code> to properly display tooltips of its
	1522	* renderers, <code>JTree</code> must be a registered component with the
	1523	* <code>ToolTipManager</code>. This can be done by invoking
	1524	* <code>ToolTipManager.sharedInstance().registerComponent(tree)</code>.
	1525	* This is not done automatically!
	1526	*
	1527	* @param event the <code>MouseEvent</code> that initiated the
	1528	* <code>ToolTip</code> display
	1529	* @return a string containing the tooltip or <code>null</code>
	1530	* if <code>event</code> is null
	1531	*/
	1532	public String getToolTipText(MouseEvent event) {
	1533	String tip = null;
	1534
	1535	if(event != null) {
	1536	Point p = event.getPoint();
	1537	int selRow = getRowForLocation(p.x, p.y);
	1538	TreeCellRenderer r = getCellRenderer();
	1539
	1540	if(selRow != -1 && r != null) {
	1541	TreePath path = getPathForRow(selRow);
	1542	Object lastPath = path.getLastPathComponent();
	1543	Component rComponent = r.getTreeCellRendererComponent
	1544	(this, lastPath, isRowSelected(selRow),
	1545	isExpanded(selRow), getModel().isLeaf(lastPath), selRow,
	1546	true);
	1547
	1548	if(rComponent instanceof JComponent) {
	1549	MouseEvent newEvent;
	1550	Rectangle pathBounds = getPathBounds(path);
	1551
	1552	p.translate(-pathBounds.x, -pathBounds.y);
	1553	newEvent = new MouseEvent(rComponent, event.getID(),
	1554	event.getWhen(),
	1555	event.getModifiers(),
	1556	p.x, p.y,
	1557	event.getXOnScreen(),
	1558	event.getYOnScreen(),
	1559	event.getClickCount(),
	1560	event.isPopupTrigger(),
	1561	MouseEvent.NOBUTTON);
	1562
	1563	tip = ((JComponent)rComponent).getToolTipText(newEvent);
	1564	}
	1565	}
	1566	}
	1567	// No tip from the renderer get our own tip
	1568	if (tip == null) {
	1569	tip = getToolTipText();
	1570	}
	1571	return tip;
	1572	}
	1573
	1574	/**
	1575	* Called by the renderers to convert the specified value to
	1576	* text. This implementation returns <code>value.toString</code>, ignoring
	1577	* all other arguments. To control the conversion, subclass this
	1578	* method and use any of the arguments you need.
	1579	*
	1580	* @param value the <code>Object</code> to convert to text
	1581	* @param selected true if the node is selected
	1582	* @param expanded true if the node is expanded
	1583	* @param leaf true if the node is a leaf node
	1584	* @param row an integer specifying the node's display row, where 0 is
	1585	* the first row in the display
	1586	* @param hasFocus true if the node has the focus
	1587	* @return the <code>String</code> representation of the node's value
	1588	*/
	1589	public String convertValueToText(Object value, boolean selected,
	1590	boolean expanded, boolean leaf, int row,
	1591	boolean hasFocus) {
	1592	if(value != null) {
	1593	String sValue = value.toString();
	1594	if (sValue != null) {
	1595	return sValue;
	1596	}
	1597	}
	1598	return "";
	1599	}
	1600
	1601	//
	1602	// The following are convenience methods that get forwarded to the
	1603	// current TreeUI.
	1604	//
	1605
	1606	/**
	1607	* Returns the number of viewable nodes. A node is viewable if all of its
	1608	* parents are expanded. The root is only included in this count if
	1609	* {@code isRootVisible()} is {@code true}. This returns {@code 0} if
	1610	* the UI has not been set.
	1611	*
	1612	* @return the number of viewable nodes
	1613	*/
	1614	public int getRowCount() {
	1615	TreeUI tree = getUI();
	1616
	1617	if(tree != null)
	1618	return tree.getRowCount(this);
	1619	return 0;
	1620	}
	1621
	1622	/**
	1623	* Selects the node identified by the specified path. If any
	1624	* component of the path is hidden (under a collapsed node), and
	1625	* <code>getExpandsSelectedPaths</code> is true it is
	1626	* exposed (made viewable).
	1627	*
	1628	* @param path the <code>TreePath</code> specifying the node to select
	1629	*/
	1630	public void setSelectionPath(TreePath path) {
	1631	getSelectionModel().setSelectionPath(path);
	1632	}
	1633
	1634	/**
	1635	* Selects the nodes identified by the specified array of paths.
	1636	* If any component in any of the paths is hidden (under a collapsed
	1637	* node), and <code>getExpandsSelectedPaths</code> is true
	1638	* it is exposed (made viewable).
	1639	*
	1640	* @param paths an array of <code>TreePath</code> objects that specifies
	1641	* the nodes to select
	1642	*/
	1643	public void setSelectionPaths(TreePath[] paths) {
	1644	getSelectionModel().setSelectionPaths(paths);
	1645	}
	1646
	1647	/**
	1648	* Sets the path identifies as the lead. The lead may not be selected.
	1649	* The lead is not maintained by <code>JTree</code>,
	1650	* rather the UI will update it.
	1651	* <p>
	1652	* This is a bound property.
	1653	*
	1654	* @param newPath the new lead path
	1655	* @since 1.3
	1656	* @beaninfo
	1657	* bound: true
	1658	* description: Lead selection path
	1659	*/
	1660	public void setLeadSelectionPath(TreePath newPath) {
	1661	TreePath oldValue = leadPath;
	1662
	1663	leadPath = newPath;
	1664	firePropertyChange(LEAD_SELECTION_PATH_PROPERTY, oldValue, newPath);
	1665	}
	1666
	1667	/**
	1668	* Sets the path identified as the anchor.
	1669	* The anchor is not maintained by <code>JTree</code>, rather the UI will
	1670	* update it.
	1671	* <p>
	1672	* This is a bound property.
	1673	*
	1674	* @param newPath the new anchor path
	1675	* @since 1.3
	1676	* @beaninfo
	1677	* bound: true
	1678	* description: Anchor selection path
	1679	*/
	1680	public void setAnchorSelectionPath(TreePath newPath) {
	1681	TreePath oldValue = anchorPath;
	1682
	1683	anchorPath = newPath;
	1684	firePropertyChange(ANCHOR_SELECTION_PATH_PROPERTY, oldValue, newPath);
	1685	}
	1686
	1687	/**
	1688	* Selects the node at the specified row in the display.
	1689	*
	1690	* @param row the row to select, where 0 is the first row in
	1691	* the display
	1692	*/
	1693	public void setSelectionRow(int row) {
	1694	int[] rows = { row };
	1695
	1696	setSelectionRows(rows);
	1697	}
	1698
	1699	/**
	1700	* Selects the nodes corresponding to each of the specified rows
	1701	* in the display. If a particular element of <code>rows</code> is
	1702	* < 0 or >= <code>getRowCount</code>, it will be ignored.
	1703	* If none of the elements
	1704	* in <code>rows</code> are valid rows, the selection will
	1705	* be cleared. That is it will be as if <code>clearSelection</code>
	1706	* was invoked.
	1707	*
	1708	* @param rows an array of ints specifying the rows to select,
	1709	* where 0 indicates the first row in the display
	1710	*/
	1711	public void setSelectionRows(int[] rows) {
	1712	TreeUI ui = getUI();
	1713
	1714	if(ui != null && rows != null) {
	1715	int numRows = rows.length;
	1716	TreePath[] paths = new TreePath[numRows];
	1717
	1718	for(int counter = 0; counter < numRows; counter++) {
	1719	paths[counter] = ui.getPathForRow(this, rows[counter]);
	1720	}
	1721	setSelectionPaths(paths);
	1722	}
	1723	}
	1724
	1725	/**
	1726	* Adds the node identified by the specified <code>TreePath</code>
	1727	* to the current selection. If any component of the path isn't
	1728	* viewable, and <code>getExpandsSelectedPaths</code> is true it is
	1729	* made viewable.
	1730	* <p>
	1731	* Note that <code>JTree</code> does not allow duplicate nodes to
	1732	* exist as children under the same parent -- each sibling must be
	1733	* a unique object.
	1734	*
	1735	* @param path the <code>TreePath</code> to add
	1736	*/
	1737	public void addSelectionPath(TreePath path) {
	1738	getSelectionModel().addSelectionPath(path);
	1739	}
	1740
	1741	/**
	1742	* Adds each path in the array of paths to the current selection. If
	1743	* any component of any of the paths isn't viewable and
	1744	* <code>getExpandsSelectedPaths</code> is true, it is
	1745	* made viewable.
	1746	* <p>
	1747	* Note that <code>JTree</code> does not allow duplicate nodes to
	1748	* exist as children under the same parent -- each sibling must be
	1749	* a unique object.
	1750	*
	1751	* @param paths an array of <code>TreePath</code> objects that specifies
	1752	* the nodes to add
	1753	*/
	1754	public void addSelectionPaths(TreePath[] paths) {
	1755	getSelectionModel().addSelectionPaths(paths);
	1756	}
	1757
	1758	/**
	1759	* Adds the path at the specified row to the current selection.
	1760	*
	1761	* @param row an integer specifying the row of the node to add,
	1762	* where 0 is the first row in the display
	1763	*/
	1764	public void addSelectionRow(int row) {
	1765	int[] rows = { row };
	1766
	1767	addSelectionRows(rows);
	1768	}
	1769
	1770	/**
	1771	* Adds the paths at each of the specified rows to the current selection.
	1772	*
	1773	* @param rows an array of ints specifying the rows to add,
	1774	* where 0 indicates the first row in the display
	1775	*/
	1776	public void addSelectionRows(int[] rows) {
	1777	TreeUI ui = getUI();
	1778
	1779	if(ui != null && rows != null) {
	1780	int numRows = rows.length;
	1781	TreePath[] paths = new TreePath[numRows];
	1782
	1783	for(int counter = 0; counter < numRows; counter++)
	1784	paths[counter] = ui.getPathForRow(this, rows[counter]);
	1785	addSelectionPaths(paths);
	1786	}
	1787	}
	1788
	1789	/**
	1790	* Returns the last path component of the selected path. This is
	1791	* a convenience method for
	1792	* {@code getSelectionModel().getSelectionPath().getLastPathComponent()}.
	1793	* This is typically only useful if the selection has one path.
	1794	*
	1795	* @return the last path component of the selected path, or
	1796	* <code>null</code> if nothing is selected
	1797	* @see TreePath#getLastPathComponent
	1798	*/
	1799	public Object getLastSelectedPathComponent() {
	1800	TreePath selPath = getSelectionModel().getSelectionPath();
	1801
	1802	if(selPath != null)
	1803	return selPath.getLastPathComponent();
	1804	return null;
	1805	}
	1806
	1807	/**
	1808	* Returns the path identified as the lead.
	1809	* @return path identified as the lead
	1810	*/
	1811	public TreePath getLeadSelectionPath() {
	1812	return leadPath;
	1813	}
	1814
	1815	/**
	1816	* Returns the path identified as the anchor.
	1817	* @return path identified as the anchor
	1818	* @since 1.3
	1819	*/
	1820	public TreePath getAnchorSelectionPath() {
	1821	return anchorPath;
	1822	}
	1823
	1824	/**
	1825	* Returns the path to the first selected node.
	1826	*
	1827	* @return the <code>TreePath</code> for the first selected node,
	1828	* or <code>null</code> if nothing is currently selected
	1829	*/
	1830	public TreePath getSelectionPath() {
	1831	return getSelectionModel().getSelectionPath();
	1832	}
	1833
	1834	/**
	1835	* Returns the paths of all selected values.
	1836	*
	1837	* @return an array of <code>TreePath</code> objects indicating the selected
	1838	* nodes, or <code>null</code> if nothing is currently selected
	1839	*/
	1840	public TreePath[] getSelectionPaths() {
	1841	return getSelectionModel().getSelectionPaths();
	1842	}
	1843
	1844	/**
	1845	* Returns all of the currently selected rows. This method is simply
	1846	* forwarded to the <code>TreeSelectionModel</code>.
	1847	* If nothing is selected <code>null</code> or an empty array will
	1848	* be returned, based on the <code>TreeSelectionModel</code>
	1849	* implementation.
	1850	*
	1851	* @return an array of integers that identifies all currently selected rows
	1852	* where 0 is the first row in the display
	1853	*/
	1854	public int[] getSelectionRows() {
	1855	return getSelectionModel().getSelectionRows();
	1856	}
	1857
	1858	/**
	1859	* Returns the number of nodes selected.
	1860	*
	1861	* @return the number of nodes selected
	1862	*/
	1863	public int getSelectionCount() {
	1864	return selectionModel.getSelectionCount();
	1865	}
	1866
	1867	/**
	1868	* Returns the smallest selected row. If the selection is empty, or
	1869	* none of the selected paths are viewable, {@code -1} is returned.
	1870	*
	1871	* @return the smallest selected row
	1872	*/
	1873	public int getMinSelectionRow() {
	1874	return getSelectionModel().getMinSelectionRow();
	1875	}
	1876
	1877	/**
	1878	* Returns the largest selected row. If the selection is empty, or
	1879	* none of the selected paths are viewable, {@code -1} is returned.
	1880	*
	1881	* @return the largest selected row
	1882	*/
	1883	public int getMaxSelectionRow() {
	1884	return getSelectionModel().getMaxSelectionRow();
	1885	}
	1886
	1887	/**
	1888	* Returns the row index corresponding to the lead path.
	1889	*
	1890	* @return an integer giving the row index of the lead path,
	1891	* where 0 is the first row in the display; or -1
	1892	* if <code>leadPath</code> is <code>null</code>
	1893	*/
	1894	public int getLeadSelectionRow() {
	1895	TreePath leadPath = getLeadSelectionPath();
	1896
	1897	if (leadPath != null) {
	1898	return getRowForPath(leadPath);
	1899	}
	1900	return -1;
	1901	}
	1902
	1903	/**
	1904	* Returns true if the item identified by the path is currently selected.
	1905	*
	1906	* @param path a <code>TreePath</code> identifying a node
	1907	* @return true if the node is selected
	1908	*/
	1909	public boolean isPathSelected(TreePath path) {
	1910	return getSelectionModel().isPathSelected(path);
	1911	}
	1912
	1913	/**
	1914	* Returns true if the node identified by row is selected.
	1915	*
	1916	* @param row an integer specifying a display row, where 0 is the first
	1917	* row in the display
	1918	* @return true if the node is selected
	1919	*/
	1920	public boolean isRowSelected(int row) {
	1921	return getSelectionModel().isRowSelected(row);
	1922	}
	1923
	1924	/**
	1925	* Returns an <code>Enumeration</code> of the descendants of the
	1926	* path <code>parent</code> that
	1927	* are currently expanded. If <code>parent</code> is not currently
	1928	* expanded, this will return <code>null</code>.
	1929	* If you expand/collapse nodes while
	1930	* iterating over the returned <code>Enumeration</code>
	1931	* this may not return all
	1932	* the expanded paths, or may return paths that are no longer expanded.
	1933	*
	1934	* @param parent the path which is to be examined
	1935	* @return an <code>Enumeration</code> of the descendents of
	1936	* <code>parent</code>, or <code>null</code> if
	1937	* <code>parent</code> is not currently expanded
	1938	*/
	1939	public Enumeration<TreePath> getExpandedDescendants(TreePath parent) {
	1940	if(!isExpanded(parent))
	1941	return null;
	1942
	1943	Enumeration<TreePath> toggledPaths = expandedState.keys();
	1944	Vector<TreePath> elements = null;
	1945	TreePath path;
	1946	Object value;
	1947
	1948	if(toggledPaths != null) {
	1949	while(toggledPaths.hasMoreElements()) {
	1950	path = toggledPaths.nextElement();
	1951	value = expandedState.get(path);
	1952	// Add the path if it is expanded, a descendant of parent,
	1953	// and it is visible (all parents expanded). This is rather
	1954	// expensive!
	1955	if(path != parent && value != null &&
	1956	((Boolean)value).booleanValue() &&
	1957	parent.isDescendant(path) && isVisible(path)) {
	1958	if (elements == null) {
	1959	elements = new Vector<TreePath>();
	1960	}
	1961	elements.addElement(path);
	1962	}
	1963	}
	1964	}
	1965	if (elements == null) {
	1966	Set<TreePath> empty = Collections.emptySet();
	1967	return Collections.enumeration(empty);
	1968	}
	1969	return elements.elements();
	1970	}
	1971
	1972	/**
	1973	* Returns true if the node identified by the path has ever been
	1974	* expanded.
	1975	* @return true if the <code>path</code> has ever been expanded
	1976	*/
	1977	public boolean hasBeenExpanded(TreePath path) {
	1978	return (path != null && expandedState.get(path) != null);
	1979	}
	1980
	1981	/**
	1982	* Returns true if the node identified by the path is currently expanded,
	1983	*
	1984	* @param path the <code>TreePath</code> specifying the node to check
	1985	* @return false if any of the nodes in the node's path are collapsed,
	1986	* true if all nodes in the path are expanded
	1987	*/
	1988	public boolean isExpanded(TreePath path) {
	1989
	1990	if(path == null)
	1991	return false;
	1992	Object value;
	1993
	1994	do{
	1995	value = expandedState.get(path);
	1996	if(value == null \|\| !((Boolean)value).booleanValue())
	1997	return false;
	1998	} while( (path=path.getParentPath())!=null );
	1999
	2000	return true;
	2001	}
	2002
	2003	/**
	2004	* Returns true if the node at the specified display row is currently
	2005	* expanded.
	2006	*
	2007	* @param row the row to check, where 0 is the first row in the
	2008	* display
	2009	* @return true if the node is currently expanded, otherwise false
	2010	*/
	2011	public boolean isExpanded(int row) {
	2012	TreeUI tree = getUI();
	2013
	2014	if(tree != null) {
	2015	TreePath path = tree.getPathForRow(this, row);
	2016
	2017	if(path != null) {
	2018	Boolean value = expandedState.get(path);
	2019
	2020	return (value != null && value.booleanValue());
	2021	}
	2022	}
	2023	return false;
	2024	}
	2025
	2026	/**
	2027	* Returns true if the value identified by path is currently collapsed,
	2028	* this will return false if any of the values in path are currently
	2029	* not being displayed.
	2030	*
	2031	* @param path the <code>TreePath</code> to check
	2032	* @return true if any of the nodes in the node's path are collapsed,
	2033	* false if all nodes in the path are expanded
	2034	*/
	2035	public boolean isCollapsed(TreePath path) {
	2036	return !isExpanded(path);
	2037	}
	2038
	2039	/**
	2040	* Returns true if the node at the specified display row is collapsed.
	2041	*
	2042	* @param row the row to check, where 0 is the first row in the
	2043	* display
	2044	* @return true if the node is currently collapsed, otherwise false
	2045	*/
	2046	public boolean isCollapsed(int row) {
	2047	return !isExpanded(row);
	2048	}
	2049
	2050	/**
	2051	* Ensures that the node identified by path is currently viewable.
	2052	*
	2053	* @param path the <code>TreePath</code> to make visible
	2054	*/
	2055	public void makeVisible(TreePath path) {
	2056	if(path != null) {
	2057	TreePath parentPath = path.getParentPath();
	2058
	2059	if(parentPath != null) {
	2060	expandPath(parentPath);
	2061	}
	2062	}
	2063	}
	2064
	2065	/**
	2066	* Returns true if the value identified by path is currently viewable,
	2067	* which means it is either the root or all of its parents are expanded.
	2068	* Otherwise, this method returns false.
	2069	*
	2070	* @return true if the node is viewable, otherwise false
	2071	*/
	2072	public boolean isVisible(TreePath path) {
	2073	if(path != null) {
	2074	TreePath parentPath = path.getParentPath();
	2075
	2076	if(parentPath != null)
	2077	return isExpanded(parentPath);
	2078	// Root.
	2079	return true;
	2080	}
	2081	return false;
	2082	}
	2083
	2084	/**
	2085	* Returns the <code>Rectangle</code> that the specified node will be drawn
	2086	* into. Returns <code>null</code> if any component in the path is hidden
	2087	* (under a collapsed parent).
	2088	* <p>
	2089	* Note:<br>
	2090	* This method returns a valid rectangle, even if the specified
	2091	* node is not currently displayed.
	2092	*
	2093	* @param path the <code>TreePath</code> identifying the node
	2094	* @return the <code>Rectangle</code> the node is drawn in,
	2095	* or <code>null</code>
	2096	*/
	2097	public Rectangle getPathBounds(TreePath path) {
	2098	TreeUI tree = getUI();
	2099
	2100	if(tree != null)
	2101	return tree.getPathBounds(this, path);
	2102	return null;
	2103	}
	2104
	2105	/**
	2106	* Returns the <code>Rectangle</code> that the node at the specified row is
	2107	* drawn in.
	2108	*
	2109	* @param row the row to be drawn, where 0 is the first row in the
	2110	* display
	2111	* @return the <code>Rectangle</code> the node is drawn in
	2112	*/
	2113	public Rectangle getRowBounds(int row) {
	2114	return getPathBounds(getPathForRow(row));
	2115	}
	2116
	2117	/**
	2118	* Makes sure all the path components in path are expanded (except
	2119	* for the last path component) and scrolls so that the
	2120	* node identified by the path is displayed. Only works when this
	2121	* <code>JTree</code> is contained in a <code>JScrollPane</code>.
	2122	*
	2123	* @param path the <code>TreePath</code> identifying the node to
	2124	* bring into view
	2125	*/
	2126	public void scrollPathToVisible(TreePath path) {
	2127	if(path != null) {
	2128	makeVisible(path);
	2129
	2130	Rectangle bounds = getPathBounds(path);
	2131
	2132	if(bounds != null) {
	2133	scrollRectToVisible(bounds);
	2134	if (accessibleContext != null) {
	2135	((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
	2136	}
	2137	}
	2138	}
	2139	}
	2140
	2141	/**
	2142	* Scrolls the item identified by row until it is displayed. The minimum
	2143	* of amount of scrolling necessary to bring the row into view
	2144	* is performed. Only works when this <code>JTree</code> is contained in a
	2145	* <code>JScrollPane</code>.
	2146	*
	2147	* @param row an integer specifying the row to scroll, where 0 is the
	2148	* first row in the display
	2149	*/
	2150	public void scrollRowToVisible(int row) {
	2151	scrollPathToVisible(getPathForRow(row));
	2152	}
	2153
	2154	/**
	2155	* Returns the path for the specified row. If <code>row</code> is
	2156	* not visible, or a {@code TreeUI} has not been set, <code>null</code>
	2157	* is returned.
	2158	*
	2159	* @param row an integer specifying a row
	2160	* @return the <code>TreePath</code> to the specified node,
	2161	* <code>null</code> if <code>row < 0</code>
	2162	* or <code>row >= getRowCount()</code>
	2163	*/
	2164	public TreePath getPathForRow(int row) {
	2165	TreeUI tree = getUI();
	2166
	2167	if(tree != null)
	2168	return tree.getPathForRow(this, row);
	2169	return null;
	2170	}
	2171
	2172	/**
	2173	* Returns the row that displays the node identified by the specified
	2174	* path.
	2175	*
	2176	* @param path the <code>TreePath</code> identifying a node
	2177	* @return an integer specifying the display row, where 0 is the first
	2178	* row in the display, or -1 if any of the elements in path
	2179	* are hidden under a collapsed parent.
	2180	*/
	2181	public int getRowForPath(TreePath path) {
	2182	TreeUI tree = getUI();
	2183
	2184	if(tree != null)
	2185	return tree.getRowForPath(this, path);
	2186	return -1;
	2187	}
	2188
	2189	/**
	2190	* Ensures that the node identified by the specified path is
	2191	* expanded and viewable. If the last item in the path is a
	2192	* leaf, this will have no effect.
	2193	*
	2194	* @param path the <code>TreePath</code> identifying a node
	2195	*/
	2196	public void expandPath(TreePath path) {
	2197	// Only expand if not leaf!
	2198	TreeModel model = getModel();
	2199
	2200	if(path != null && model != null &&
	2201	!model.isLeaf(path.getLastPathComponent())) {
	2202	setExpandedState(path, true);
	2203	}
	2204	}
	2205
	2206	/**
	2207	* Ensures that the node in the specified row is expanded and
	2208	* viewable.
	2209	* <p>
	2210	* If <code>row</code> is < 0 or >= <code>getRowCount</code> this
	2211	* will have no effect.
	2212	*
	2213	* @param row an integer specifying a display row, where 0 is the
	2214	* first row in the display
	2215	*/
	2216	public void expandRow(int row) {
	2217	expandPath(getPathForRow(row));
	2218	}
	2219
	2220	/**
	2221	* Ensures that the node identified by the specified path is
	2222	* collapsed and viewable.
	2223	*
	2224	* @param path the <code>TreePath</code> identifying a node
	2225	*/
	2226	public void collapsePath(TreePath path) {
	2227	setExpandedState(path, false);
	2228	}
	2229
	2230	/**
	2231	* Ensures that the node in the specified row is collapsed.
	2232	* <p>
	2233	* If <code>row</code> is < 0 or >= <code>getRowCount</code> this
	2234	* will have no effect.
	2235	*
	2236	* @param row an integer specifying a display row, where 0 is the
	2237	* first row in the display
	2238	*/
	2239	public void collapseRow(int row) {
	2240	collapsePath(getPathForRow(row));
	2241	}
	2242
	2243	/**
	2244	* Returns the path for the node at the specified location.
	2245	*
	2246	* @param x an integer giving the number of pixels horizontally from
	2247	* the left edge of the display area, minus any left margin
	2248	* @param y an integer giving the number of pixels vertically from
	2249	* the top of the display area, minus any top margin
	2250	* @return the <code>TreePath</code> for the node at that location
	2251	*/
	2252	public TreePath getPathForLocation(int x, int y) {
	2253	TreePath closestPath = getClosestPathForLocation(x, y);
	2254
	2255	if(closestPath != null) {
	2256	Rectangle pathBounds = getPathBounds(closestPath);
	2257
	2258	if(pathBounds != null &&
	2259	x >= pathBounds.x && x < (pathBounds.x + pathBounds.width) &&
	2260	y >= pathBounds.y && y < (pathBounds.y + pathBounds.height))
	2261	return closestPath;
	2262	}
	2263	return null;
	2264	}
	2265
	2266	/**
	2267	* Returns the row for the specified location.
	2268	*
	2269	* @param x an integer giving the number of pixels horizontally from
	2270	* the left edge of the display area, minus any left margin
	2271	* @param y an integer giving the number of pixels vertically from
	2272	* the top of the display area, minus any top margin
	2273	* @return the row corresponding to the location, or -1 if the
	2274	* location is not within the bounds of a displayed cell
	2275	* @see #getClosestRowForLocation
	2276	*/
	2277	public int getRowForLocation(int x, int y) {
	2278	return getRowForPath(getPathForLocation(x, y));
	2279	}
	2280
	2281	/**
	2282	* Returns the path to the node that is closest to x,y. If
	2283	* no nodes are currently viewable, or there is no model, returns
	2284	* <code>null</code>, otherwise it always returns a valid path. To test if
	2285	* the node is exactly at x, y, get the node's bounds and
	2286	* test x, y against that.
	2287	*
	2288	* @param x an integer giving the number of pixels horizontally from
	2289	* the left edge of the display area, minus any left margin
	2290	* @param y an integer giving the number of pixels vertically from
	2291	* the top of the display area, minus any top margin
	2292	* @return the <code>TreePath</code> for the node closest to that location,
	2293	* <code>null</code> if nothing is viewable or there is no model
	2294	*
	2295	* @see #getPathForLocation
	2296	* @see #getPathBounds
	2297	*/
	2298	public TreePath getClosestPathForLocation(int x, int y) {
	2299	TreeUI tree = getUI();
	2300
	2301	if(tree != null)
	2302	return tree.getClosestPathForLocation(this, x, y);
	2303	return null;
	2304	}
	2305
	2306	/**
	2307	* Returns the row to the node that is closest to x,y. If no nodes
	2308	* are viewable or there is no model, returns -1. Otherwise,
	2309	* it always returns a valid row. To test if the returned object is
	2310	* exactly at x, y, get the bounds for the node at the returned
	2311	* row and test x, y against that.
	2312	*
	2313	* @param x an integer giving the number of pixels horizontally from
	2314	* the left edge of the display area, minus any left margin
	2315	* @param y an integer giving the number of pixels vertically from
	2316	* the top of the display area, minus any top margin
	2317	* @return the row closest to the location, -1 if nothing is
	2318	* viewable or there is no model
	2319	*
	2320	* @see #getRowForLocation
	2321	* @see #getRowBounds
	2322	*/
	2323	public int getClosestRowForLocation(int x, int y) {
	2324	return getRowForPath(getClosestPathForLocation(x, y));
	2325	}
	2326
	2327	/**
	2328	* Returns true if the tree is being edited. The item that is being
	2329	* edited can be obtained using <code>getSelectionPath</code>.
	2330	*
	2331	* @return true if the user is currently editing a node
	2332	* @see #getSelectionPath
	2333	*/
	2334	public boolean isEditing() {
	2335	TreeUI tree = getUI();
	2336
	2337	if(tree != null)
	2338	return tree.isEditing(this);
	2339	return false;
	2340	}
	2341
	2342	/**
	2343	* Ends the current editing session.
	2344	* (The <code>DefaultTreeCellEditor</code>
	2345	* object saves any edits that are currently in progress on a cell.
	2346	* Other implementations may operate differently.)
	2347	* Has no effect if the tree isn't being edited.
	2348	* <blockquote>
	2349	* <b>Note:</b><br>
	2350	* To make edit-saves automatic whenever the user changes
	2351	* their position in the tree, use {@link #setInvokesStopCellEditing}.
	2352	* </blockquote>
	2353	*
	2354	* @return true if editing was in progress and is now stopped,
	2355	* false if editing was not in progress
	2356	*/
	2357	public boolean stopEditing() {
	2358	TreeUI tree = getUI();
	2359
	2360	if(tree != null)
	2361	return tree.stopEditing(this);
	2362	return false;
	2363	}
	2364
	2365	/**
	2366	* Cancels the current editing session. Has no effect if the
	2367	* tree isn't being edited.
	2368	*/
	2369	public void cancelEditing() {
	2370	TreeUI tree = getUI();
	2371
	2372	if(tree != null)
	2373	tree.cancelEditing(this);
	2374	}
	2375
	2376	/**
	2377	* Selects the node identified by the specified path and initiates
	2378	* editing. The edit-attempt fails if the <code>CellEditor</code>
	2379	* does not allow
	2380	* editing for the specified item.
	2381	*
	2382	* @param path the <code>TreePath</code> identifying a node
	2383	*/
	2384	public void startEditingAtPath(TreePath path) {
	2385	TreeUI tree = getUI();
	2386
	2387	if(tree != null)
	2388	tree.startEditingAtPath(this, path);
	2389	}
	2390
	2391	/**
	2392	* Returns the path to the element that is currently being edited.
	2393	*
	2394	* @return the <code>TreePath</code> for the node being edited
	2395	*/
	2396	public TreePath getEditingPath() {
	2397	TreeUI tree = getUI();
	2398
	2399	if(tree != null)
	2400	return tree.getEditingPath(this);
	2401	return null;
	2402	}
	2403
	2404	//
	2405	// Following are primarily convenience methods for mapping from
	2406	// row based selections to path selections. Sometimes it is
	2407	// easier to deal with these than paths (mouse downs, key downs
	2408	// usually just deal with index based selections).
	2409	// Since row based selections require a UI many of these won't work
	2410	// without one.
	2411	//
	2412
	2413	/**
	2414	* Sets the tree's selection model. When a <code>null</code> value is
	2415	* specified an empty
	2416	* <code>selectionModel</code> is used, which does not allow selections.
	2417	* <p>
	2418	* This is a bound property.
	2419	*
	2420	* @param selectionModel the <code>TreeSelectionModel</code> to use,
	2421	* or <code>null</code> to disable selections
	2422	* @see TreeSelectionModel
	2423	* @beaninfo
	2424	* bound: true
	2425	* description: The tree's selection model.
	2426	*/
	2427	public void setSelectionModel(TreeSelectionModel selectionModel) {
	2428	if(selectionModel == null)
	2429	selectionModel = EmptySelectionModel.sharedInstance();
	2430
	2431	TreeSelectionModel oldValue = this.selectionModel;
	2432
	2433	if (this.selectionModel != null && selectionRedirector != null) {
	2434	this.selectionModel.removeTreeSelectionListener
	2435	(selectionRedirector);
	2436	}
	2437	if (accessibleContext != null) {
	2438	this.selectionModel.removeTreeSelectionListener((TreeSelectionListener)accessibleContext);
	2439	selectionModel.addTreeSelectionListener((TreeSelectionListener)accessibleContext);
	2440	}
	2441
	2442	this.selectionModel = selectionModel;
	2443	if (selectionRedirector != null) {
	2444	this.selectionModel.addTreeSelectionListener(selectionRedirector);
	2445	}
	2446	firePropertyChange(SELECTION_MODEL_PROPERTY, oldValue,
	2447	this.selectionModel);
	2448
	2449	if (accessibleContext != null) {
	2450	accessibleContext.firePropertyChange(
	2451	AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
	2452	Boolean.valueOf(false), Boolean.valueOf(true));
	2453	}
	2454	}
	2455
	2456	/**
	2457	* Returns the model for selections. This should always return a
	2458	* non-<code>null</code> value. If you don't want to allow anything
	2459	* to be selected
	2460	* set the selection model to <code>null</code>, which forces an empty
	2461	* selection model to be used.
	2462	*
	2463	* @see #setSelectionModel
	2464	*/
	2465	public TreeSelectionModel getSelectionModel() {
	2466	return selectionModel;
	2467	}
	2468
	2469	/**
	2470	* Returns the paths (inclusive) between the specified rows. If
	2471	* the specified indices are within the viewable set of rows, or
	2472	* bound the viewable set of rows, then the indices are
	2473	* constrained by the viewable set of rows. If the specified
	2474	* indices are not within the viewable set of rows, or do not
	2475	* bound the viewable set of rows, then an empty array is
	2476	* returned. For example, if the row count is {@code 10}, and this
	2477	* method is invoked with {@code -1, 20}, then the specified
	2478	* indices are constrained to the viewable set of rows, and this is
	2479	* treated as if invoked with {@code 0, 9}. On the other hand, if
	2480	* this were invoked with {@code -10, -1}, then the specified
	2481	* indices do not bound the viewable set of rows, and an empty
	2482	* array is returned.
	2483	* <p>
	2484	* The parameters are not order dependent. That is, {@code
	2485	* getPathBetweenRows(x, y)} is equivalent to
	2486	* {@code getPathBetweenRows(y, x)}.
	2487	* <p>
	2488	* An empty array is returned if the row count is {@code 0}, or
	2489	* the specified indices do not bound the viewable set of rows.
	2490	*
	2491	* @param index0 the first index in the range
	2492	* @param index1 the last index in the range
	2493	* @return the paths (inclusive) between the specified row indices
	2494	*/
	2495	protected TreePath[] getPathBetweenRows(int index0, int index1) {
	2496	TreeUI tree = getUI();
	2497	if (tree != null) {
	2498	int rowCount = getRowCount();
	2499	if (rowCount > 0 && !((index0 < 0 && index1 < 0) \|\|
	2500	(index0 >= rowCount && index1 >= rowCount))){
	2501	index0 = Math.min(rowCount - 1, Math.max(index0, 0));
	2502	index1 = Math.min(rowCount - 1, Math.max(index1, 0));
	2503	int minIndex = Math.min(index0, index1);
	2504	int maxIndex = Math.max(index0, index1);
	2505	TreePath[] selection = new TreePath[
	2506	maxIndex - minIndex + 1];
	2507	for(int counter = minIndex; counter <= maxIndex; counter++) {
	2508	selection[counter - minIndex] =
	2509	tree.getPathForRow(this, counter);
	2510	}
	2511	return selection;
	2512	}
	2513	}
	2514	return new TreePath[0];
	2515	}
	2516
	2517	/**
	2518	* Selects the rows in the specified interval (inclusive). If
	2519	* the specified indices are within the viewable set of rows, or bound
	2520	* the viewable set of rows, then the specified rows are constrained by
	2521	* the viewable set of rows. If the specified indices are not within the
	2522	* viewable set of rows, or do not bound the viewable set of rows, then
	2523	* the selection is cleared. For example, if the row count is {@code
	2524	* 10}, and this method is invoked with {@code -1, 20}, then the
	2525	* specified indices bounds the viewable range, and this is treated as
	2526	* if invoked with {@code 0, 9}. On the other hand, if this were
	2527	* invoked with {@code -10, -1}, then the specified indices do not
	2528	* bound the viewable set of rows, and the selection is cleared.
	2529	* <p>
	2530	* The parameters are not order dependent. That is, {@code
	2531	* setSelectionInterval(x, y)} is equivalent to
	2532	* {@code setSelectionInterval(y, x)}.
	2533	*
	2534	* @param index0 the first index in the range to select
	2535	* @param index1 the last index in the range to select
	2536	*/
	2537	public void setSelectionInterval(int index0, int index1) {
	2538	TreePath[] paths = getPathBetweenRows(index0, index1);
	2539
	2540	this.getSelectionModel().setSelectionPaths(paths);
	2541	}
	2542
	2543	/**
	2544	* Adds the specified rows (inclusive) to the selection. If the
	2545	* specified indices are within the viewable set of rows, or bound
	2546	* the viewable set of rows, then the specified indices are
	2547	* constrained by the viewable set of rows. If the indices are not
	2548	* within the viewable set of rows, or do not bound the viewable
	2549	* set of rows, then the selection is unchanged. For example, if
	2550	* the row count is {@code 10}, and this method is invoked with
	2551	* {@code -1, 20}, then the specified indices bounds the viewable
	2552	* range, and this is treated as if invoked with {@code 0, 9}. On
	2553	* the other hand, if this were invoked with {@code -10, -1}, then
	2554	* the specified indices do not bound the viewable set of rows,
	2555	* and the selection is unchanged.
	2556	* <p>
	2557	* The parameters are not order dependent. That is, {@code
	2558	* addSelectionInterval(x, y)} is equivalent to
	2559	* {@code addSelectionInterval(y, x)}.
	2560	*
	2561	* @param index0 the first index in the range to add to the selection
	2562	* @param index1 the last index in the range to add to the selection
	2563	*/
	2564	public void addSelectionInterval(int index0, int index1) {
	2565	TreePath[] paths = getPathBetweenRows(index0, index1);
	2566
	2567	if (paths != null && paths.length > 0) {
	2568	this.getSelectionModel().addSelectionPaths(paths);
	2569	}
	2570	}
	2571
	2572	/**
	2573	* Removes the specified rows (inclusive) from the selection. If
	2574	* the specified indices are within the viewable set of rows, or bound
	2575	* the viewable set of rows, then the specified indices are constrained by
	2576	* the viewable set of rows. If the specified indices are not within the
	2577	* viewable set of rows, or do not bound the viewable set of rows, then
	2578	* the selection is unchanged. For example, if the row count is {@code
	2579	* 10}, and this method is invoked with {@code -1, 20}, then the
	2580	* specified range bounds the viewable range, and this is treated as
	2581	* if invoked with {@code 0, 9}. On the other hand, if this were
	2582	* invoked with {@code -10, -1}, then the specified range does not
	2583	* bound the viewable set of rows, and the selection is unchanged.
	2584	* <p>
	2585	* The parameters are not order dependent. That is, {@code
	2586	* removeSelectionInterval(x, y)} is equivalent to
	2587	* {@code removeSelectionInterval(y, x)}.
	2588	*
	2589	* @param index0 the first row to remove from the selection
	2590	* @param index1 the last row to remove from the selection
	2591	*/
	2592	public void removeSelectionInterval(int index0, int index1) {
	2593	TreePath[] paths = getPathBetweenRows(index0, index1);
	2594
	2595	if (paths != null && paths.length > 0) {
	2596	this.getSelectionModel().removeSelectionPaths(paths);
	2597	}
	2598	}
	2599
	2600	/**
	2601	* Removes the node identified by the specified path from the current
	2602	* selection.
	2603	*
	2604	* @param path the <code>TreePath</code> identifying a node
	2605	*/
	2606	public void removeSelectionPath(TreePath path) {
	2607	this.getSelectionModel().removeSelectionPath(path);
	2608	}
	2609
	2610	/**
	2611	* Removes the nodes identified by the specified paths from the
	2612	* current selection.
	2613	*
	2614	* @param paths an array of <code>TreePath</code> objects that
	2615	* specifies the nodes to remove
	2616	*/
	2617	public void removeSelectionPaths(TreePath[] paths) {
	2618	this.getSelectionModel().removeSelectionPaths(paths);
	2619	}
	2620
	2621	/**
	2622	* Removes the row at the index <code>row</code> from the current
	2623	* selection.
	2624	*
	2625	* @param row the row to remove
	2626	*/
	2627	public void removeSelectionRow(int row) {
	2628	int[] rows = { row };
	2629
	2630	removeSelectionRows(rows);
	2631	}
	2632
	2633	/**
	2634	* Removes the rows that are selected at each of the specified
	2635	* rows.
	2636	*
	2637	* @param rows an array of ints specifying display rows, where 0 is
	2638	* the first row in the display
	2639	*/
	2640	public void removeSelectionRows(int[] rows) {
	2641	TreeUI ui = getUI();
	2642
	2643	if(ui != null && rows != null) {
	2644	int numRows = rows.length;
	2645	TreePath[] paths = new TreePath[numRows];
	2646
	2647	for(int counter = 0; counter < numRows; counter++)
	2648	paths[counter] = ui.getPathForRow(this, rows[counter]);
	2649	removeSelectionPaths(paths);
	2650	}
	2651	}
	2652
	2653	/**
	2654	* Clears the selection.
	2655	*/
	2656	public void clearSelection() {
	2657	getSelectionModel().clearSelection();
	2658	}
	2659
	2660	/**
	2661	* Returns true if the selection is currently empty.
	2662	*
	2663	* @return true if the selection is currently empty
	2664	*/
	2665	public boolean isSelectionEmpty() {
	2666	return getSelectionModel().isSelectionEmpty();
	2667	}
	2668
	2669	/**
	2670	* Adds a listener for <code>TreeExpansion</code> events.
	2671	*
	2672	* @param tel a TreeExpansionListener that will be notified when
	2673	* a tree node is expanded or collapsed (a "negative
	2674	* expansion")
	2675	*/
	2676	public void addTreeExpansionListener(TreeExpansionListener tel) {
	2677	if (settingUI) {
	2678	uiTreeExpansionListener = tel;
	2679	}
	2680	listenerList.add(TreeExpansionListener.class, tel);
	2681	}
	2682
	2683	/**
	2684	* Removes a listener for <code>TreeExpansion</code> events.
	2685	*
	2686	* @param tel the <code>TreeExpansionListener</code> to remove
	2687	*/
	2688	public void removeTreeExpansionListener(TreeExpansionListener tel) {
	2689	listenerList.remove(TreeExpansionListener.class, tel);
	2690	if (uiTreeExpansionListener == tel) {
	2691	uiTreeExpansionListener = null;
	2692	}
	2693	}
	2694
	2695	/**
	2696	* Returns an array of all the <code>TreeExpansionListener</code>s added
	2697	* to this JTree with addTreeExpansionListener().
	2698	*
	2699	* @return all of the <code>TreeExpansionListener</code>s added or an empty
	2700	* array if no listeners have been added
	2701	* @since 1.4
	2702	*/
	2703	public TreeExpansionListener[] getTreeExpansionListeners() {
	2704	return listenerList.getListeners(TreeExpansionListener.class);
	2705	}
	2706
	2707	/**
	2708	* Adds a listener for <code>TreeWillExpand</code> events.
	2709	*
	2710	* @param tel a <code>TreeWillExpandListener</code> that will be notified
	2711	* when a tree node will be expanded or collapsed (a "negative
	2712	* expansion")
	2713	*/
	2714	public void addTreeWillExpandListener(TreeWillExpandListener tel) {
	2715	listenerList.add(TreeWillExpandListener.class, tel);
	2716	}
	2717
	2718	/**
	2719	* Removes a listener for <code>TreeWillExpand</code> events.
	2720	*
	2721	* @param tel the <code>TreeWillExpandListener</code> to remove
	2722	*/
	2723	public void removeTreeWillExpandListener(TreeWillExpandListener tel) {
	2724	listenerList.remove(TreeWillExpandListener.class, tel);
	2725	}
	2726
	2727	/**
	2728	* Returns an array of all the <code>TreeWillExpandListener</code>s added
	2729	* to this JTree with addTreeWillExpandListener().
	2730	*
	2731	* @return all of the <code>TreeWillExpandListener</code>s added or an empty
	2732	* array if no listeners have been added
	2733	* @since 1.4
	2734	*/
	2735	public TreeWillExpandListener[] getTreeWillExpandListeners() {
	2736	return listenerList.getListeners(TreeWillExpandListener.class);
	2737	}
	2738
	2739	/**
	2740	* Notifies all listeners that have registered interest for
	2741	* notification on this event type. The event instance
	2742	* is lazily created using the <code>path</code> parameter.
	2743	*
	2744	* @param path the <code>TreePath</code> indicating the node that was
	2745	* expanded
	2746	* @see EventListenerList
	2747	*/
	2748	public void fireTreeExpanded(TreePath path) {
	2749	// Guaranteed to return a non-null array
	2750	Object[] listeners = listenerList.getListenerList();
	2751	TreeExpansionEvent e = null;
	2752	if (uiTreeExpansionListener != null) {
	2753	e = new TreeExpansionEvent(this, path);
	2754	uiTreeExpansionListener.treeExpanded(e);
	2755	}
	2756	// Process the listeners last to first, notifying
	2757	// those that are interested in this event
	2758	for (int i = listeners.length-2; i>=0; i-=2) {
	2759	if (listeners[i]==TreeExpansionListener.class &&
	2760	listeners[i + 1] != uiTreeExpansionListener) {
	2761	// Lazily create the event:
	2762	if (e == null)
	2763	e = new TreeExpansionEvent(this, path);
	2764	((TreeExpansionListener)listeners[i+1]).
	2765	treeExpanded(e);
	2766	}
	2767	}
	2768	}
	2769
	2770	/**
	2771	* Notifies all listeners that have registered interest for
	2772	* notification on this event type. The event instance
	2773	* is lazily created using the <code>path</code> parameter.
	2774	*
	2775	* @param path the <code>TreePath</code> indicating the node that was
	2776	* collapsed
	2777	* @see EventListenerList
	2778	*/
	2779	public void fireTreeCollapsed(TreePath path) {
	2780	// Guaranteed to return a non-null array
	2781	Object[] listeners = listenerList.getListenerList();
	2782	TreeExpansionEvent e = null;
	2783	if (uiTreeExpansionListener != null) {
	2784	e = new TreeExpansionEvent(this, path);
	2785	uiTreeExpansionListener.treeCollapsed(e);
	2786	}
	2787	// Process the listeners last to first, notifying
	2788	// those that are interested in this event
	2789	for (int i = listeners.length-2; i>=0; i-=2) {
	2790	if (listeners[i]==TreeExpansionListener.class &&
	2791	listeners[i + 1] != uiTreeExpansionListener) {
	2792	// Lazily create the event:
	2793	if (e == null)
	2794	e = new TreeExpansionEvent(this, path);
	2795	((TreeExpansionListener)listeners[i+1]).
	2796	treeCollapsed(e);
	2797	}
	2798	}
	2799	}
	2800
	2801	/**
	2802	* Notifies all listeners that have registered interest for
	2803	* notification on this event type. The event instance
	2804	* is lazily created using the <code>path</code> parameter.
	2805	*
	2806	* @param path the <code>TreePath</code> indicating the node that was
	2807	* expanded
	2808	* @see EventListenerList
	2809	*/
	2810	public void fireTreeWillExpand(TreePath path) throws ExpandVetoException {
	2811	// Guaranteed to return a non-null array
	2812	Object[] listeners = listenerList.getListenerList();
	2813	TreeExpansionEvent e = null;
	2814	// Process the listeners last to first, notifying
	2815	// those that are interested in this event
	2816	for (int i = listeners.length-2; i>=0; i-=2) {
	2817	if (listeners[i]==TreeWillExpandListener.class) {
	2818	// Lazily create the event:
	2819	if (e == null)
	2820	e = new TreeExpansionEvent(this, path);
	2821	((TreeWillExpandListener)listeners[i+1]).
	2822	treeWillExpand(e);
	2823	}
	2824	}
	2825	}
	2826
	2827	/**
	2828	* Notifies all listeners that have registered interest for
	2829	* notification on this event type. The event instance
	2830	* is lazily created using the <code>path</code> parameter.
	2831	*
	2832	* @param path the <code>TreePath</code> indicating the node that was
	2833	* expanded
	2834	* @see EventListenerList
	2835	*/
	2836	public void fireTreeWillCollapse(TreePath path) throws ExpandVetoException {
	2837	// Guaranteed to return a non-null array
	2838	Object[] listeners = listenerList.getListenerList();
	2839	TreeExpansionEvent e = null;
	2840	// Process the listeners last to first, notifying
	2841	// those that are interested in this event
	2842	for (int i = listeners.length-2; i>=0; i-=2) {
	2843	if (listeners[i]==TreeWillExpandListener.class) {
	2844	// Lazily create the event:
	2845	if (e == null)
	2846	e = new TreeExpansionEvent(this, path);
	2847	((TreeWillExpandListener)listeners[i+1]).
	2848	treeWillCollapse(e);
	2849	}
	2850	}
	2851	}
	2852
	2853	/**
	2854	* Adds a listener for <code>TreeSelection</code> events.
	2855	*
	2856	* @param tsl the <code>TreeSelectionListener</code> that will be notified
	2857	* when a node is selected or deselected (a "negative
	2858	* selection")
	2859	*/
	2860	public void addTreeSelectionListener(TreeSelectionListener tsl) {
	2861	listenerList.add(TreeSelectionListener.class,tsl);
	2862	if(listenerList.getListenerCount(TreeSelectionListener.class) != 0
	2863	&& selectionRedirector == null) {
	2864	selectionRedirector = new TreeSelectionRedirector();
	2865	selectionModel.addTreeSelectionListener(selectionRedirector);
	2866	}
	2867	}
	2868
	2869	/**
	2870	* Removes a <code>TreeSelection</code> listener.
	2871	*
	2872	* @param tsl the <code>TreeSelectionListener</code> to remove
	2873	*/
	2874	public void removeTreeSelectionListener(TreeSelectionListener tsl) {
	2875	listenerList.remove(TreeSelectionListener.class,tsl);
	2876	if(listenerList.getListenerCount(TreeSelectionListener.class) == 0
	2877	&& selectionRedirector != null) {
	2878	selectionModel.removeTreeSelectionListener
	2879	(selectionRedirector);
	2880	selectionRedirector = null;
	2881	}
	2882	}
	2883
	2884	/**
	2885	* Returns an array of all the <code>TreeSelectionListener</code>s added
	2886	* to this JTree with addTreeSelectionListener().
	2887	*
	2888	* @return all of the <code>TreeSelectionListener</code>s added or an empty
	2889	* array if no listeners have been added
	2890	* @since 1.4
	2891	*/
	2892	public TreeSelectionListener[] getTreeSelectionListeners() {
	2893	return listenerList.getListeners(TreeSelectionListener.class);
	2894	}
	2895
	2896	/**
	2897	* Notifies all listeners that have registered interest for
	2898	* notification on this event type.
	2899	*
	2900	* @param e the <code>TreeSelectionEvent</code> to be fired;
	2901	* generated by the
	2902	* <code>TreeSelectionModel</code>
	2903	* when a node is selected or deselected
	2904	* @see EventListenerList
	2905	*/
	2906	protected void fireValueChanged(TreeSelectionEvent e) {
	2907	// Guaranteed to return a non-null array
	2908	Object[] listeners = listenerList.getListenerList();
	2909	// Process the listeners last to first, notifying
	2910	// those that are interested in this event
	2911	for (int i = listeners.length-2; i>=0; i-=2) {
	2912	// TreeSelectionEvent e = null;
	2913	if (listeners[i]==TreeSelectionListener.class) {
	2914	// Lazily create the event:
	2915	// if (e == null)
	2916	// e = new ListSelectionEvent(this, firstIndex, lastIndex);
	2917	((TreeSelectionListener)listeners[i+1]).valueChanged(e);
	2918	}
	2919	}
	2920	}
	2921
	2922	/**
	2923	* Sent when the tree has changed enough that we need to resize
	2924	* the bounds, but not enough that we need to remove the
	2925	* expanded node set (e.g nodes were expanded or collapsed, or
	2926	* nodes were inserted into the tree). You should never have to
	2927	* invoke this, the UI will invoke this as it needs to.
	2928	*/
	2929	public void treeDidChange() {
	2930	revalidate();
	2931	repaint();
	2932	}
	2933
	2934	/**
	2935	* Sets the number of rows that are to be displayed.
	2936	* This will only work if the tree is contained in a
	2937	* <code>JScrollPane</code>,
	2938	* and will adjust the preferred size and size of that scrollpane.
	2939	* <p>
	2940	* This is a bound property.
	2941	*
	2942	* @param newCount the number of rows to display
	2943	* @beaninfo
	2944	* bound: true
	2945	* description: The number of rows that are to be displayed.
	2946	*/
	2947	public void setVisibleRowCount(int newCount) {
	2948	int oldCount = visibleRowCount;
	2949
	2950	visibleRowCount = newCount;
	2951	firePropertyChange(VISIBLE_ROW_COUNT_PROPERTY, oldCount,
	2952	visibleRowCount);
	2953	invalidate();
	2954	if (accessibleContext != null) {
	2955	((AccessibleJTree)accessibleContext).fireVisibleDataPropertyChange();
	2956	}
	2957	}
	2958
	2959	/**
	2960	* Returns the number of rows that are displayed in the display area.
	2961	*
	2962	* @return the number of rows displayed
	2963	*/
	2964	public int getVisibleRowCount() {
	2965	return visibleRowCount;
	2966	}
	2967
	2968	/**
	2969	* Expands the root path, assuming the current TreeModel has been set.
	2970	*/
	2971	private void expandRoot() {
	2972	TreeModel model = getModel();
	2973
	2974	if(model != null && model.getRoot() != null) {
	2975	expandPath(new TreePath(model.getRoot()));
	2976	}
	2977	}
	2978
	2979	/**
	2980	* Returns the TreePath to the next tree element that
	2981	* begins with a prefix. To handle the conversion of a
	2982	* <code>TreePath</code> into a String, <code>convertValueToText</code>
	2983	* is used.
	2984	*
	2985	* @param prefix the string to test for a match
	2986	* @param startingRow the row for starting the search
	2987	* @param bias the search direction, either
	2988	* Position.Bias.Forward or Position.Bias.Backward.
	2989	* @return the TreePath of the next tree element that
	2990	* starts with the prefix; otherwise null
	2991	* @exception IllegalArgumentException if prefix is null
	2992	* or startingRow is out of bounds
	2993	* @since 1.4
	2994	*/
	2995	public TreePath getNextMatch(String prefix, int startingRow,
	2996	Position.Bias bias) {
	2997
	2998	int max = getRowCount();
	2999	if (prefix == null) {
	3000	throw new IllegalArgumentException();
	3001	}
	3002	if (startingRow < 0 \|\| startingRow >= max) {
	3003	throw new IllegalArgumentException();
	3004	}
	3005	prefix = prefix.toUpperCase();
	3006
	3007	// start search from the next/previous element froom the
	3008	// selected element
	3009	int increment = (bias == Position.Bias.Forward) ? 1 : -1;
	3010	int row = startingRow;
	3011	do {
	3012	TreePath path = getPathForRow(row);
	3013	String text = convertValueToText(
	3014	path.getLastPathComponent(), isRowSelected(row),
	3015	isExpanded(row), true, row, false);
	3016
	3017	if (text.toUpperCase().startsWith(prefix)) {
	3018	return path;
	3019	}
	3020	row = (row + increment + max) % max;
	3021	} while (row != startingRow);
	3022	return null;
	3023	}
	3024
	3025	// Serialization support.
	3026	private void writeObject(ObjectOutputStream s) throws IOException {
	3027	Vector<Object> values = new Vector<Object>();
	3028
	3029	s.defaultWriteObject();
	3030	// Save the cellRenderer, if its Serializable.
	3031	if(cellRenderer != null && cellRenderer instanceof Serializable) {
	3032	values.addElement("cellRenderer");
	3033	values.addElement(cellRenderer);
	3034	}
	3035	// Save the cellEditor, if its Serializable.
	3036	if(cellEditor != null && cellEditor instanceof Serializable) {
	3037	values.addElement("cellEditor");
	3038	values.addElement(cellEditor);
	3039	}
	3040	// Save the treeModel, if its Serializable.
	3041	if(treeModel != null && treeModel instanceof Serializable) {
	3042	values.addElement("treeModel");
	3043	values.addElement(treeModel);
	3044	}
	3045	// Save the selectionModel, if its Serializable.
	3046	if(selectionModel != null && selectionModel instanceof Serializable) {
	3047	values.addElement("selectionModel");
	3048	values.addElement(selectionModel);
	3049	}
	3050
	3051	Object expandedData = getArchivableExpandedState();
	3052
	3053	if(expandedData != null) {
	3054	values.addElement("expandedState");
	3055	values.addElement(expandedData);
	3056	}
	3057
	3058	s.writeObject(values);
	3059	if (getUIClassID().equals(uiClassID)) {
	3060	byte count = JComponent.getWriteObjCounter(this);
	3061	JComponent.setWriteObjCounter(this, --count);
	3062	if (count == 0 && ui != null) {
	3063	ui.installUI(this);
	3064	}
	3065	}
	3066	}
	3067
	3068	private void readObject(ObjectInputStream s)
	3069	throws IOException, ClassNotFoundException {
	3070	s.defaultReadObject();
	3071
	3072	// Create an instance of expanded state.
	3073
	3074	expandedState = new Hashtable<TreePath, Boolean>();
	3075
	3076	expandedStack = new Stack<Stack<TreePath>>();
	3077
	3078	Vector values = (Vector)s.readObject();
	3079	int indexCounter = 0;
	3080	int maxCounter = values.size();
	3081
	3082	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	3083	equals("cellRenderer")) {
	3084	cellRenderer = (TreeCellRenderer)values.elementAt(++indexCounter);
	3085	indexCounter++;
	3086	}
	3087	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	3088	equals("cellEditor")) {
	3089	cellEditor = (TreeCellEditor)values.elementAt(++indexCounter);
	3090	indexCounter++;
	3091	}
	3092	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	3093	equals("treeModel")) {
	3094	treeModel = (TreeModel)values.elementAt(++indexCounter);
	3095	indexCounter++;
	3096	}
	3097	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	3098	equals("selectionModel")) {
	3099	selectionModel = (TreeSelectionModel)values.elementAt(++indexCounter);
	3100	indexCounter++;
	3101	}
	3102	if(indexCounter < maxCounter && values.elementAt(indexCounter).
	3103	equals("expandedState")) {
	3104	unarchiveExpandedState(values.elementAt(++indexCounter));
	3105	indexCounter++;
	3106	}
	3107	// Reinstall the redirector.
	3108	if(listenerList.getListenerCount(TreeSelectionListener.class) != 0) {
	3109	selectionRedirector = new TreeSelectionRedirector();
	3110	selectionModel.addTreeSelectionListener(selectionRedirector);
	3111	}
	3112	// Listener to TreeModel.
	3113	if(treeModel != null) {
	3114	treeModelListener = createTreeModelListener();
	3115	if(treeModelListener != null)
	3116	treeModel.addTreeModelListener(treeModelListener);
	3117	}
	3118	}
	3119
	3120	/**
	3121	* Returns an object that can be archived indicating what nodes are
	3122	* expanded and what aren't. The objects from the model are NOT
	3123	* written out.
	3124	*/
	3125	private Object getArchivableExpandedState() {
	3126	TreeModel model = getModel();
	3127
	3128	if(model != null) {
	3129	Enumeration<TreePath> paths = expandedState.keys();
	3130
	3131	if(paths != null) {
	3132	Vector<Object> state = new Vector<Object>();
	3133
	3134	while(paths.hasMoreElements()) {
	3135	TreePath path = paths.nextElement();
	3136	Object archivePath;
	3137
	3138	try {
	3139	archivePath = getModelIndexsForPath(path);
	3140	} catch (Error error) {
	3141	archivePath = null;
	3142	}
	3143	if(archivePath != null) {
	3144	state.addElement(archivePath);
	3145	state.addElement(expandedState.get(path));
	3146	}
	3147	}
	3148	return state;
	3149	}
	3150	}
	3151	return null;
	3152	}
	3153
	3154	/**
	3155	* Updates the expanded state of nodes in the tree based on the
	3156	* previously archived state <code>state</code>.
	3157	*/
	3158	private void unarchiveExpandedState(Object state) {
	3159	if(state instanceof Vector) {
	3160	Vector paths = (Vector)state;
	3161
	3162	for(int counter = paths.size() - 1; counter >= 0; counter--) {
	3163	Boolean eState = (Boolean)paths.elementAt(counter--);
	3164	TreePath path;
	3165
	3166	try {
	3167	path = getPathForIndexs((int[])paths.elementAt(counter));
	3168	if(path != null)
	3169	expandedState.put(path, eState);
	3170	} catch (Error error) {}
	3171	}
	3172	}
	3173	}
	3174
	3175	/**
	3176	* Returns an array of integers specifying the indexs of the
	3177	* components in the <code>path</code>. If <code>path</code> is
	3178	* the root, this will return an empty array. If <code>path</code>
	3179	* is <code>null</code>, <code>null</code> will be returned.
	3180	*/
	3181	private int[] getModelIndexsForPath(TreePath path) {
	3182	if(path != null) {
	3183	TreeModel model = getModel();
	3184	int count = path.getPathCount();
	3185	int[] indexs = new int[count - 1];
	3186	Object parent = model.getRoot();
	3187
	3188	for(int counter = 1; counter < count; counter++) {
	3189	indexs[counter - 1] = model.getIndexOfChild
	3190	(parent, path.getPathComponent(counter));
	3191	parent = path.getPathComponent(counter);
	3192	if(indexs[counter - 1] < 0)
	3193	return null;
	3194	}
	3195	return indexs;
	3196	}
	3197	return null;
	3198	}
	3199
	3200	/**
	3201	* Returns a <code>TreePath</code> created by obtaining the children
	3202	* for each of the indices in <code>indexs</code>. If <code>indexs</code>
	3203	* or the <code>TreeModel</code> is <code>null</code>, it will return
	3204	* <code>null</code>.
	3205	*/
	3206	private TreePath getPathForIndexs(int[] indexs) {
	3207	if(indexs == null)
	3208	return null;
	3209
	3210	TreeModel model = getModel();
	3211
	3212	if(model == null)
	3213	return null;
	3214
	3215	int count = indexs.length;
	3216	Object parent = model.getRoot();
	3217	TreePath parentPath = new TreePath(parent);
	3218
	3219	for(int counter = 0; counter < count; counter++) {
	3220	parent = model.getChild(parent, indexs[counter]);
	3221	if(parent == null)
	3222	return null;
	3223	parentPath = parentPath.pathByAddingChild(parent);
	3224	}
	3225	return parentPath;
	3226	}
	3227
	3228	/**
	3229	* <code>EmptySelectionModel</code> is a <code>TreeSelectionModel</code>
	3230	* that does not allow anything to be selected.
	3231	* <p>
	3232	* <strong>Warning:</strong>
	3233	* Serialized objects of this class will not be compatible with
	3234	* future Swing releases. The current serialization support is
	3235	* appropriate for short term storage or RMI between applications running
	3236	* the same version of Swing. As of 1.4, support for long term storage
	3237	* of all JavaBeans<sup><font size="-2">TM</font></sup>
	3238	* has been added to the <code>java.beans</code> package.
	3239	* Please see {@link java.beans.XMLEncoder}.
	3240	*/
	3241	protected static class EmptySelectionModel extends
	3242	DefaultTreeSelectionModel
	3243	{
	3244	/**
	3245	* The single instance of {@code EmptySelectionModel}.
	3246	*/
	3247	protected static final EmptySelectionModel sharedInstance =
	3248	new EmptySelectionModel();
	3249
	3250	/**
	3251	* Returns the single instance of {@code EmptySelectionModel}.
	3252	*
	3253	* @return single instance of {@code EmptySelectionModel}
	3254	*/
	3255	static public EmptySelectionModel sharedInstance() {
	3256	return sharedInstance;
	3257	}
	3258
	3259	/**
	3260	* This is overriden to do nothing; {@code EmptySelectionModel}
	3261	* does not allow a selection.
	3262	*
	3263	* @param paths the paths to select; this is ignored
	3264	*/
	3265	public void setSelectionPaths(TreePath[] paths) {}
	3266
	3267	/**
	3268	* This is overriden to do nothing; {@code EmptySelectionModel}
	3269	* does not allow a selection.
	3270	*
	3271	* @param paths the paths to add to the selection; this is ignored
	3272	*/
	3273	public void addSelectionPaths(TreePath[] paths) {}
	3274
	3275	/**
	3276	* This is overriden to do nothing; {@code EmptySelectionModel}
	3277	* does not allow a selection.
	3278	*
	3279	* @param paths the paths to remove; this is ignored
	3280	*/
	3281	public void removeSelectionPaths(TreePath[] paths) {}
	3282
	3283	/**
	3284	* This is overriden to do nothing; {@code EmptySelectionModel}
	3285	* does not allow a selection.
	3286	*
	3287	* @param mode the selection mode; this is ignored
	3288	* @since 1.7
	3289	*/
	3290	public void setSelectionMode(int mode) {
	3291	}
	3292
	3293	/**
	3294	* This is overriden to do nothing; {@code EmptySelectionModel}
	3295	* does not allow a selection.
	3296	*
	3297	* @param mapper the {@code RowMapper} instance; this is ignored
	3298	* @since 1.7
	3299	*/
	3300	public void setRowMapper(RowMapper mapper) {
	3301	}
	3302
	3303	/**
	3304	* This is overriden to do nothing; {@code EmptySelectionModel}
	3305	* does not allow a selection.
	3306	*
	3307	* @param listener the listener to add; this is ignored
	3308	* @since 1.7
	3309	*/
	3310	public void addTreeSelectionListener(TreeSelectionListener listener) {
	3311	}
	3312
	3313	/**
	3314	* This is overriden to do nothing; {@code EmptySelectionModel}
	3315	* does not allow a selection.
	3316	*
	3317	* @param listener the listener to remove; this is ignored
	3318	* @since 1.7
	3319	*/
	3320	public void removeTreeSelectionListener(
	3321	TreeSelectionListener listener) {
	3322	}
	3323
	3324	/**
	3325	* This is overriden to do nothing; {@code EmptySelectionModel}
	3326	* does not allow a selection.
	3327	*
	3328	* @param listener the listener to add; this is ignored
	3329	* @since 1.7
	3330	*/
	3331	public void addPropertyChangeListener(
	3332	PropertyChangeListener listener) {
	3333	}
	3334
	3335	/**
	3336	* This is overriden to do nothing; {@code EmptySelectionModel}
	3337	* does not allow a selection.
	3338	*
	3339	* @param listener the listener to remove; this is ignored
	3340	* @since 1.7
	3341	*/
	3342	public void removePropertyChangeListener(
	3343	PropertyChangeListener listener) {
	3344	}
	3345	}
	3346
	3347
	3348	/**
	3349	* Handles creating a new <code>TreeSelectionEvent</code> with the
	3350	* <code>JTree</code> as the
	3351	* source and passing it off to all the listeners.
	3352	* <p>
	3353	* <strong>Warning:</strong>
	3354	* Serialized objects of this class will not be compatible with
	3355	* future Swing releases. The current serialization support is
	3356	* appropriate for short term storage or RMI between applications running
	3357	* the same version of Swing. As of 1.4, support for long term storage
	3358	* of all JavaBeans<sup><font size="-2">TM</font></sup>
	3359	* has been added to the <code>java.beans</code> package.
	3360	* Please see {@link java.beans.XMLEncoder}.
	3361	*/
	3362	protected class TreeSelectionRedirector implements Serializable,
	3363	TreeSelectionListener
	3364	{
	3365	/**
	3366	* Invoked by the <code>TreeSelectionModel</code> when the
	3367	* selection changes.
	3368	*
	3369	* @param e the <code>TreeSelectionEvent</code> generated by the
	3370	* <code>TreeSelectionModel</code>
	3371	*/
	3372	public void valueChanged(TreeSelectionEvent e) {
	3373	TreeSelectionEvent newE;
	3374
	3375	newE = (TreeSelectionEvent)e.cloneWithSource(JTree.this);
	3376	fireValueChanged(newE);
	3377	}
	3378	} // End of class JTree.TreeSelectionRedirector
	3379
	3380	//
	3381	// Scrollable interface
	3382	//
	3383
	3384	/**
	3385	* Returns the preferred display size of a <code>JTree</code>. The height is
	3386	* determined from <code>getVisibleRowCount</code> and the width
	3387	* is the current preferred width.
	3388	*
	3389	* @return a <code>Dimension</code> object containing the preferred size
	3390	*/
	3391	public Dimension getPreferredScrollableViewportSize() {
	3392	int width = getPreferredSize().width;
	3393	int visRows = getVisibleRowCount();
	3394	int height = -1;
	3395
	3396	if(isFixedRowHeight())
	3397	height = visRows * getRowHeight();
	3398	else {
	3399	TreeUI ui = getUI();
	3400
	3401	if (ui != null && visRows > 0) {
	3402	int rc = ui.getRowCount(this);
	3403
	3404	if (rc >= visRows) {
	3405	Rectangle bounds = getRowBounds(visRows - 1);
	3406	if (bounds != null) {
	3407	height = bounds.y + bounds.height;
	3408	}
	3409	}
	3410	else if (rc > 0) {
	3411	Rectangle bounds = getRowBounds(0);
	3412	if (bounds != null) {
	3413	height = bounds.height * visRows;
	3414	}
	3415	}
	3416	}
	3417	if (height == -1) {
	3418	height = 16 * visRows;
	3419	}
	3420	}
	3421	return new Dimension(width, height);
	3422	}
	3423
	3424	/**
	3425	* Returns the amount to increment when scrolling. The amount is
	3426	* the height of the first displayed row that isn't completely in view
	3427	* or, if it is totally displayed, the height of the next row in the
	3428	* scrolling direction.
	3429	*
	3430	* @param visibleRect the view area visible within the viewport
	3431	* @param orientation either <code>SwingConstants.VERTICAL</code>
	3432	* or <code>SwingConstants.HORIZONTAL</code>
	3433	* @param direction less than zero to scroll up/left,
	3434	* greater than zero for down/right
	3435	* @return the "unit" increment for scrolling in the specified direction
	3436	* @see JScrollBar#setUnitIncrement(int)
	3437	*/
	3438	public int getScrollableUnitIncrement(Rectangle visibleRect,
	3439	int orientation, int direction) {
	3440	if(orientation == SwingConstants.VERTICAL) {
	3441	Rectangle rowBounds;
	3442	int firstIndex = getClosestRowForLocation
	3443	(0, visibleRect.y);
	3444
	3445	if(firstIndex != -1) {
	3446	rowBounds = getRowBounds(firstIndex);
	3447	if(rowBounds.y != visibleRect.y) {
	3448	if(direction < 0) {
	3449	// UP
	3450	return Math.max(0, (visibleRect.y - rowBounds.y));
	3451	}
	3452	return (rowBounds.y + rowBounds.height - visibleRect.y);
	3453	}
	3454	if(direction < 0) { // UP
	3455	if(firstIndex != 0) {
	3456	rowBounds = getRowBounds(firstIndex - 1);
	3457	return rowBounds.height;
	3458	}
	3459	}
	3460	else {
	3461	return rowBounds.height;
	3462	}
	3463	}
	3464	return 0;
	3465	}
	3466	return 4;
	3467	}
	3468
	3469
	3470	/**
	3471	* Returns the amount for a block increment, which is the height or
	3472	* width of <code>visibleRect</code>, based on <code>orientation</code>.
	3473	*
	3474	* @param visibleRect the view area visible within the viewport
	3475	* @param orientation either <code>SwingConstants.VERTICAL</code>
	3476	* or <code>SwingConstants.HORIZONTAL</code>
	3477	* @param direction less than zero to scroll up/left,
	3478	* greater than zero for down/right.
	3479	* @return the "block" increment for scrolling in the specified direction
	3480	* @see JScrollBar#setBlockIncrement(int)
	3481	*/
	3482	public int getScrollableBlockIncrement(Rectangle visibleRect,
	3483	int orientation, int direction) {
	3484	return (orientation == SwingConstants.VERTICAL) ? visibleRect.height :
	3485	visibleRect.width;
	3486	}
	3487
	3488	/**
	3489	* Returns false to indicate that the width of the viewport does not
	3490	* determine the width of the table, unless the preferred width of
	3491	* the tree is smaller than the viewports width. In other words:
	3492	* ensure that the tree is never smaller than its viewport.
	3493	*
	3494	* @return whether the tree should track the width of the viewport
	3495	* @see Scrollable#getScrollableTracksViewportWidth
	3496	*/
	3497	public boolean getScrollableTracksViewportWidth() {
	3498	Container parent = SwingUtilities.getUnwrappedParent(this);
	3499	if (parent instanceof JViewport) {
	3500	return parent.getWidth() > getPreferredSize().width;
	3501	}
	3502	return false;
	3503	}
	3504
	3505	/**
	3506	* Returns false to indicate that the height of the viewport does not
	3507	* determine the height of the table, unless the preferred height
	3508	* of the tree is smaller than the viewports height. In other words:
	3509	* ensure that the tree is never smaller than its viewport.
	3510	*
	3511	* @return whether the tree should track the height of the viewport
	3512	* @see Scrollable#getScrollableTracksViewportHeight
	3513	*/
	3514	public boolean getScrollableTracksViewportHeight() {
	3515	Container parent = SwingUtilities.getUnwrappedParent(this);
	3516	if (parent instanceof JViewport) {
	3517	return parent.getHeight() > getPreferredSize().height;
	3518	}
	3519	return false;
	3520	}
	3521
	3522	/**
	3523	* Sets the expanded state of this <code>JTree</code>.
	3524	* If <code>state</code> is
	3525	* true, all parents of <code>path</code> and path are marked as
	3526	* expanded. If <code>state</code> is false, all parents of
	3527	* <code>path</code> are marked EXPANDED, but <code>path</code> itself
	3528	* is marked collapsed.<p>
	3529	* This will fail if a <code>TreeWillExpandListener</code> vetos it.
	3530	*/
	3531	protected void setExpandedState(TreePath path, boolean state) {
	3532	if(path != null) {
	3533	// Make sure all parents of path are expanded.
	3534	Stack<TreePath> stack;
	3535	TreePath parentPath = path.getParentPath();
	3536
	3537	if (expandedStack.size() == 0) {
	3538	stack = new Stack<TreePath>();
	3539	}
	3540	else {
	3541	stack = expandedStack.pop();
	3542	}
	3543
	3544	try {
	3545	while(parentPath != null) {
	3546	if(isExpanded(parentPath)) {
	3547	parentPath = null;
	3548	}
	3549	else {
	3550	stack.push(parentPath);
	3551	parentPath = parentPath.getParentPath();
	3552	}
	3553	}
	3554	for(int counter = stack.size() - 1; counter >= 0; counter--) {
	3555	parentPath = stack.pop();
	3556	if(!isExpanded(parentPath)) {
	3557	try {
	3558	fireTreeWillExpand(parentPath);
	3559	} catch (ExpandVetoException eve) {
	3560	// Expand vetoed!
	3561	return;
	3562	}
	3563	expandedState.put(parentPath, Boolean.TRUE);
	3564	fireTreeExpanded(parentPath);
	3565	if (accessibleContext != null) {
	3566	((AccessibleJTree)accessibleContext).
	3567	fireVisibleDataPropertyChange();
	3568	}
	3569	}
	3570	}
	3571	}
	3572	finally {
	3573	if (expandedStack.size() < TEMP_STACK_SIZE) {
	3574	stack.removeAllElements();
	3575	expandedStack.push(stack);
	3576	}
	3577	}
	3578	if(!state) {
	3579	// collapse last path.
	3580	Object cValue = expandedState.get(path);
	3581
	3582	if(cValue != null && ((Boolean)cValue).booleanValue()) {
	3583	try {
	3584	fireTreeWillCollapse(path);
	3585	}
	3586	catch (ExpandVetoException eve) {
	3587	return;
	3588	}
	3589	expandedState.put(path, Boolean.FALSE);
	3590	fireTreeCollapsed(path);
	3591	if (removeDescendantSelectedPaths(path, false) &&
	3592	!isPathSelected(path)) {
	3593	// A descendant was selected, select the parent.
	3594	addSelectionPath(path);
	3595	}
	3596	if (accessibleContext != null) {
	3597	((AccessibleJTree)accessibleContext).
	3598	fireVisibleDataPropertyChange();
	3599	}
	3600	}
	3601	}
	3602	else {
	3603	// Expand last path.
	3604	Object cValue = expandedState.get(path);
	3605
	3606	if(cValue == null \|\| !((Boolean)cValue).booleanValue()) {
	3607	try {
	3608	fireTreeWillExpand(path);
	3609	}
	3610	catch (ExpandVetoException eve) {
	3611	return;
	3612	}
	3613	expandedState.put(path, Boolean.TRUE);
	3614	fireTreeExpanded(path);
	3615	if (accessibleContext != null) {
	3616	((AccessibleJTree)accessibleContext).
	3617	fireVisibleDataPropertyChange();
	3618	}
	3619	}
	3620	}
	3621	}
	3622	}
	3623
	3624	/**
	3625	* Returns an <code>Enumeration</code> of <code>TreePaths</code>
	3626	* that have been expanded that
	3627	* are descendants of <code>parent</code>.
	3628	*/
	3629	protected Enumeration<TreePath>
	3630	getDescendantToggledPaths(TreePath parent)
	3631	{
	3632	if(parent == null)
	3633	return null;
	3634
	3635	Vector<TreePath> descendants = new Vector<TreePath>();
	3636	Enumeration<TreePath> nodes = expandedState.keys();
	3637
	3638	while(nodes.hasMoreElements()) {
	3639	TreePath path = nodes.nextElement();
	3640	if(parent.isDescendant(path))
	3641	descendants.addElement(path);
	3642	}
	3643	return descendants.elements();
	3644	}
	3645
	3646	/**
	3647	* Removes any descendants of the <code>TreePaths</code> in
	3648	* <code>toRemove</code>
	3649	* that have been expanded.
	3650	*
	3651	* @param toRemove an enumeration of the paths to remove; a value of
	3652	* {@code null} is ignored
	3653	* @throws ClassCastException if {@code toRemove} contains an
	3654	* element that is not a {@code TreePath}; {@code null}
	3655	* values are ignored
	3656	*/
	3657	protected void
	3658	removeDescendantToggledPaths(Enumeration<TreePath> toRemove)
	3659	{
	3660	if(toRemove != null) {
	3661	while(toRemove.hasMoreElements()) {
	3662	Enumeration descendants = getDescendantToggledPaths
	3663	(toRemove.nextElement());
	3664
	3665	if(descendants != null) {
	3666	while(descendants.hasMoreElements()) {
	3667	expandedState.remove(descendants.nextElement());
	3668	}
	3669	}
	3670	}
	3671	}
	3672	}
	3673
	3674	/**
	3675	* Clears the cache of toggled tree paths. This does NOT send out
	3676	* any <code>TreeExpansionListener</code> events.
	3677	*/
	3678	protected void clearToggledPaths() {
	3679	expandedState.clear();
	3680	}
	3681
	3682	/**
	3683	* Creates and returns an instance of <code>TreeModelHandler</code>.
	3684	* The returned
	3685	* object is responsible for updating the expanded state when the
	3686	* <code>TreeModel</code> changes.
	3687	* <p>
	3688	* For more information on what expanded state means, see the
	3689	* <a href=#jtree_description>JTree description</a> above.
	3690	*/
	3691	protected TreeModelListener createTreeModelListener() {
	3692	return new TreeModelHandler();
	3693	}
	3694
	3695	/**
	3696	* Removes any paths in the selection that are descendants of
	3697	* <code>path</code>. If <code>includePath</code> is true and
	3698	* <code>path</code> is selected, it will be removed from the selection.
	3699	*
	3700	* @return true if a descendant was selected
	3701	* @since 1.3
	3702	*/
	3703	protected boolean removeDescendantSelectedPaths(TreePath path,
	3704	boolean includePath) {
	3705	TreePath[] toRemove = getDescendantSelectedPaths(path, includePath);
	3706
	3707	if (toRemove != null) {
	3708	getSelectionModel().removeSelectionPaths(toRemove);
	3709	return true;
	3710	}
	3711	return false;
	3712	}
	3713
	3714	/**
	3715	* Returns an array of paths in the selection that are descendants of
	3716	* <code>path</code>. The returned array may contain <code>null</code>s.
	3717	*/
	3718	private TreePath[] getDescendantSelectedPaths(TreePath path,
	3719	boolean includePath) {
	3720	TreeSelectionModel sm = getSelectionModel();
	3721	TreePath[] selPaths = (sm != null) ? sm.getSelectionPaths() :
	3722	null;
	3723
	3724	if(selPaths != null) {
	3725	boolean shouldRemove = false;
	3726
	3727	for(int counter = selPaths.length - 1; counter >= 0; counter--) {
	3728	if(selPaths[counter] != null &&
	3729	path.isDescendant(selPaths[counter]) &&
	3730	(!path.equals(selPaths[counter]) \|\| includePath))
	3731	shouldRemove = true;
	3732	else
	3733	selPaths[counter] = null;
	3734	}
	3735	if(!shouldRemove) {
	3736	selPaths = null;
	3737	}
	3738	return selPaths;
	3739	}
	3740	return null;
	3741	}
	3742
	3743	/**
	3744	* Removes any paths from the selection model that are descendants of
	3745	* the nodes identified by in <code>e</code>.
	3746	*/
	3747	void removeDescendantSelectedPaths(TreeModelEvent e) {
	3748	TreePath pPath = e.getTreePath();
	3749	Object[] oldChildren = e.getChildren();
	3750	TreeSelectionModel sm = getSelectionModel();
	3751
	3752	if (sm != null && pPath != null && oldChildren != null &&
	3753	oldChildren.length > 0) {
	3754	for (int counter = oldChildren.length - 1; counter >= 0;
	3755	counter--) {
	3756	// Might be better to call getDescendantSelectedPaths
	3757	// numerous times, then push to the model.
	3758	removeDescendantSelectedPaths(pPath.pathByAddingChild
	3759	(oldChildren[counter]), true);
	3760	}
	3761	}
	3762	}
	3763
	3764
	3765	/**
	3766	* Listens to the model and updates the <code>expandedState</code>
	3767	* accordingly when nodes are removed, or changed.
	3768	*/
	3769	protected class TreeModelHandler implements TreeModelListener {
	3770	public void treeNodesChanged(TreeModelEvent e) { }
	3771
	3772	public void treeNodesInserted(TreeModelEvent e) { }
	3773
	3774	public void treeStructureChanged(TreeModelEvent e) {
	3775	if(e == null)
	3776	return;
	3777
	3778	// NOTE: If I change this to NOT remove the descendants
	3779	// and update BasicTreeUIs treeStructureChanged method
	3780	// to update descendants in response to a treeStructureChanged
	3781	// event, all the children of the event won't collapse!
	3782	TreePath parent = e.getTreePath();
	3783
	3784	if(parent == null)
	3785	return;
	3786
	3787	if (parent.getPathCount() == 1) {
	3788	// New root, remove everything!
	3789	clearToggledPaths();
	3790	if(treeModel.getRoot() != null &&
	3791	!treeModel.isLeaf(treeModel.getRoot())) {
	3792	// Mark the root as expanded, if it isn't a leaf.
	3793	expandedState.put(parent, Boolean.TRUE);
	3794	}
	3795	}
	3796	else if(expandedState.get(parent) != null) {
	3797	Vector<TreePath> toRemove = new Vector<TreePath>(1);
	3798	boolean isExpanded = isExpanded(parent);
	3799
	3800	toRemove.addElement(parent);
	3801	removeDescendantToggledPaths(toRemove.elements());
	3802	if(isExpanded) {
	3803	TreeModel model = getModel();
	3804
	3805	if(model == null \|\| model.isLeaf
	3806	(parent.getLastPathComponent()))
	3807	collapsePath(parent);
	3808	else
	3809	expandedState.put(parent, Boolean.TRUE);
	3810	}
	3811	}
	3812	removeDescendantSelectedPaths(parent, false);
	3813	}
	3814
	3815	public void treeNodesRemoved(TreeModelEvent e) {
	3816	if(e == null)
	3817	return;
	3818
	3819	TreePath parent = e.getTreePath();
	3820	Object[] children = e.getChildren();
	3821
	3822	if(children == null)
	3823	return;
	3824
	3825	TreePath rPath;
	3826	Vector<TreePath> toRemove
	3827	= new Vector<TreePath>(Math.max(1, children.length));
	3828
	3829	for(int counter = children.length - 1; counter >= 0; counter--) {
	3830	rPath = parent.pathByAddingChild(children[counter]);
	3831	if(expandedState.get(rPath) != null)
	3832	toRemove.addElement(rPath);
	3833	}
	3834	if(toRemove.size() > 0)
	3835	removeDescendantToggledPaths(toRemove.elements());
	3836
	3837	TreeModel model = getModel();
	3838
	3839	if(model == null \|\| model.isLeaf(parent.getLastPathComponent()))
	3840	expandedState.remove(parent);
	3841
	3842	removeDescendantSelectedPaths(e);
	3843	}
	3844	}
	3845
	3846
	3847	/**
	3848	* <code>DynamicUtilTreeNode</code> can wrap
	3849	* vectors/hashtables/arrays/strings and
	3850	* create the appropriate children tree nodes as necessary. It is
	3851	* dynamic in that it will only create the children as necessary.
	3852	* <p>
	3853	* <strong>Warning:</strong>
	3854	* Serialized objects of this class will not be compatible with
	3855	* future Swing releases. The current serialization support is
	3856	* appropriate for short term storage or RMI between applications running
	3857	* the same version of Swing. As of 1.4, support for long term storage
	3858	* of all JavaBeans<sup><font size="-2">TM</font></sup>
	3859	* has been added to the <code>java.beans</code> package.
	3860	* Please see {@link java.beans.XMLEncoder}.
	3861	*/
	3862	public static class DynamicUtilTreeNode extends DefaultMutableTreeNode {
	3863	/**
	3864	* Does the this <code>JTree</code> have children?
	3865	* This property is currently not implemented.
	3866	*/
	3867	protected boolean hasChildren;
	3868	/** Value to create children with. */
	3869	protected Object childValue;
	3870	/** Have the children been loaded yet? */
	3871	protected boolean loadedChildren;
	3872
	3873	/**
	3874	* Adds to parent all the children in <code>children</code>.
	3875	* If <code>children</code> is an array or vector all of its
	3876	* elements are added is children, otherwise if <code>children</code>
	3877	* is a hashtable all the key/value pairs are added in the order
	3878	* <code>Enumeration</code> returns them.
	3879	*/
	3880	public static void createChildren(DefaultMutableTreeNode parent,
	3881	Object children) {
	3882	if(children instanceof Vector) {
	3883	Vector childVector = (Vector)children;
	3884
	3885	for(int counter = 0, maxCounter = childVector.size();
	3886	counter < maxCounter; counter++)
	3887	parent.add(new DynamicUtilTreeNode
	3888	(childVector.elementAt(counter),
	3889	childVector.elementAt(counter)));
	3890	}
	3891	else if(children instanceof Hashtable) {
	3892	Hashtable childHT = (Hashtable)children;
	3893	Enumeration keys = childHT.keys();
	3894	Object aKey;
	3895
	3896	while(keys.hasMoreElements()) {
	3897	aKey = keys.nextElement();
	3898	parent.add(new DynamicUtilTreeNode(aKey,
	3899	childHT.get(aKey)));
	3900	}
	3901	}
	3902	else if(children instanceof Object[]) {
	3903	Object[] childArray = (Object[])children;
	3904
	3905	for(int counter = 0, maxCounter = childArray.length;
	3906	counter < maxCounter; counter++)
	3907	parent.add(new DynamicUtilTreeNode(childArray[counter],
	3908	childArray[counter]));
	3909	}
	3910	}
	3911
	3912	/**
	3913	* Creates a node with the specified object as its value and
	3914	* with the specified children. For the node to allow children,
	3915	* the children-object must be an array of objects, a
	3916	* <code>Vector</code>, or a <code>Hashtable</code> -- even
	3917	* if empty. Otherwise, the node is not
	3918	* allowed to have children.
	3919	*
	3920	* @param value the <code>Object</code> that is the value for the
	3921	* new node
	3922	* @param children an array of <code>Object</code>s, a
	3923	* <code>Vector</code>, or a <code>Hashtable</code>
	3924	* used to create the child nodes; if any other
	3925	* object is specified, or if the value is
	3926	* <code>null</code>,
	3927	* then the node is not allowed to have children
	3928	*/
	3929	public DynamicUtilTreeNode(Object value, Object children) {
	3930	super(value);
	3931	loadedChildren = false;
	3932	childValue = children;
	3933	if(children != null) {
	3934	if(children instanceof Vector)
	3935	setAllowsChildren(true);
	3936	else if(children instanceof Hashtable)
	3937	setAllowsChildren(true);
	3938	else if(children instanceof Object[])
	3939	setAllowsChildren(true);
	3940	else
	3941	setAllowsChildren(false);
	3942	}
	3943	else
	3944	setAllowsChildren(false);
	3945	}
	3946
	3947	/**
	3948	* Returns true if this node allows children. Whether the node
	3949	* allows children depends on how it was created.
	3950	*
	3951	* @return true if this node allows children, false otherwise
	3952	* @see #JTree.DynamicUtilTreeNode
	3953	*/
	3954	public boolean isLeaf() {
	3955	return !getAllowsChildren();
	3956	}
	3957
	3958	/**
	3959	* Returns the number of child nodes.
	3960	*
	3961	* @return the number of child nodes
	3962	*/
	3963	public int getChildCount() {
	3964	if(!loadedChildren)
	3965	loadChildren();
	3966	return super.getChildCount();
	3967	}
	3968
	3969	/**
	3970	* Loads the children based on <code>childValue</code>.
	3971	* If <code>childValue</code> is a <code>Vector</code>
	3972	* or array each element is added as a child,
	3973	* if <code>childValue</code> is a <code>Hashtable</code>
	3974	* each key/value pair is added in the order that
	3975	* <code>Enumeration</code> returns the keys.
	3976	*/
	3977	protected void loadChildren() {
	3978	loadedChildren = true;
	3979	createChildren(this, childValue);
	3980	}
	3981
	3982	/**
	3983	* Subclassed to load the children, if necessary.
	3984	*/
	3985	public TreeNode getChildAt(int index) {
	3986	if(!loadedChildren)
	3987	loadChildren();
	3988	return super.getChildAt(index);
	3989	}
	3990
	3991	/**
	3992	* Subclassed to load the children, if necessary.
	3993	*/
	3994	public Enumeration children() {
	3995	if(!loadedChildren)
	3996	loadChildren();
	3997	return super.children();
	3998	}
	3999	}
	4000
	4001	void setUIProperty(String propertyName, Object value) {
	4002	if (propertyName == "rowHeight") {
	4003	if (!rowHeightSet) {
	4004	setRowHeight(((Number)value).intValue());
	4005	rowHeightSet = false;
	4006	}
	4007	} else if (propertyName == "scrollsOnExpand") {
	4008	if (!scrollsOnExpandSet) {
	4009	setScrollsOnExpand(((Boolean)value).booleanValue());
	4010	scrollsOnExpandSet = false;
	4011	}
	4012	} else if (propertyName == "showsRootHandles") {
	4013	if (!showsRootHandlesSet) {
	4014	setShowsRootHandles(((Boolean)value).booleanValue());
	4015	showsRootHandlesSet = false;
	4016	}
	4017	} else {
	4018	super.setUIProperty(propertyName, value);
	4019	}
	4020	}
	4021
	4022
	4023	/**
	4024	* Returns a string representation of this <code>JTree</code>.
	4025	* This method
	4026	* is intended to be used only for debugging purposes, and the
	4027	* content and format of the returned string may vary between
	4028	* implementations. The returned string may be empty but may not
	4029	* be <code>null</code>.
	4030	*
	4031	* @return a string representation of this <code>JTree</code>.
	4032	*/
	4033	protected String paramString() {
	4034	String rootVisibleString = (rootVisible ?
	4035	"true" : "false");
	4036	String showsRootHandlesString = (showsRootHandles ?
	4037	"true" : "false");
	4038	String editableString = (editable ?
	4039	"true" : "false");
	4040	String largeModelString = (largeModel ?
	4041	"true" : "false");
	4042	String invokesStopCellEditingString = (invokesStopCellEditing ?
	4043	"true" : "false");
	4044	String scrollsOnExpandString = (scrollsOnExpand ?
	4045	"true" : "false");
	4046
	4047	return super.paramString() +
	4048	",editable=" + editableString +
	4049	",invokesStopCellEditing=" + invokesStopCellEditingString +
	4050	",largeModel=" + largeModelString +
	4051	",rootVisible=" + rootVisibleString +
	4052	",rowHeight=" + rowHeight +
	4053	",scrollsOnExpand=" + scrollsOnExpandString +
	4054	",showsRootHandles=" + showsRootHandlesString +
	4055	",toggleClickCount=" + toggleClickCount +
	4056	",visibleRowCount=" + visibleRowCount;
	4057	}
	4058
	4059	/////////////////
	4060	// Accessibility support
	4061	////////////////
	4062
	4063	/**
	4064	* Gets the AccessibleContext associated with this JTree.
	4065	* For JTrees, the AccessibleContext takes the form of an
	4066	* AccessibleJTree.
	4067	* A new AccessibleJTree instance is created if necessary.
	4068	*
	4069	* @return an AccessibleJTree that serves as the
	4070	* AccessibleContext of this JTree
	4071	*/
	4072	public AccessibleContext getAccessibleContext() {
	4073	if (accessibleContext == null) {
	4074	accessibleContext = new AccessibleJTree();
	4075	}
	4076	return accessibleContext;
	4077	}
	4078
	4079	/**
	4080	* This class implements accessibility support for the
	4081	* <code>JTree</code> class. It provides an implementation of the
	4082	* Java Accessibility API appropriate to tree user-interface elements.
	4083	* <p>
	4084	* <strong>Warning:</strong>
	4085	* Serialized objects of this class will not be compatible with
	4086	* future Swing releases. The current serialization support is
	4087	* appropriate for short term storage or RMI between applications running
	4088	* the same version of Swing. As of 1.4, support for long term storage
	4089	* of all JavaBeans<sup><font size="-2">TM</font></sup>
	4090	* has been added to the <code>java.beans</code> package.
	4091	* Please see {@link java.beans.XMLEncoder}.
	4092	*/
	4093	protected class AccessibleJTree extends AccessibleJComponent
	4094	implements AccessibleSelection, TreeSelectionListener,
	4095	TreeModelListener, TreeExpansionListener {
	4096
	4097	TreePath leadSelectionPath;
	4098	Accessible leadSelectionAccessible;
	4099
	4100	public AccessibleJTree() {
	4101	// Add a tree model listener for JTree
	4102	TreeModel model = JTree.this.getModel();
	4103	if (model != null) {
	4104	model.addTreeModelListener(this);
	4105	}
	4106	JTree.this.addTreeExpansionListener(this);
	4107	JTree.this.addTreeSelectionListener(this);
	4108	leadSelectionPath = JTree.this.getLeadSelectionPath();
	4109	leadSelectionAccessible = (leadSelectionPath != null)
	4110	? new AccessibleJTreeNode(JTree.this,
	4111	leadSelectionPath,
	4112	JTree.this)
	4113	: null;
	4114	}
	4115
	4116	/**
	4117	* Tree Selection Listener value change method. Used to fire the
	4118	* property change
	4119	*
	4120	* @param e ListSelectionEvent
	4121	*
	4122	*/
	4123	public void valueChanged(TreeSelectionEvent e) {
	4124	// Fixes 4546503 - JTree is sending incorrect active
	4125	// descendant events
	4126	TreePath oldLeadSelectionPath = e.getOldLeadSelectionPath();
	4127	leadSelectionPath = e.getNewLeadSelectionPath();
	4128
	4129	if (oldLeadSelectionPath != leadSelectionPath) {
	4130	// Set parent to null so AccessibleJTreeNode computes
	4131	// its parent.
	4132	Accessible oldLSA = leadSelectionAccessible;
	4133	leadSelectionAccessible = (leadSelectionPath != null)
	4134	? new AccessibleJTreeNode(JTree.this,
	4135	leadSelectionPath,
	4136	null) // parent
	4137	: null;
	4138	firePropertyChange(AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY,
	4139	oldLSA, leadSelectionAccessible);
	4140	}
	4141	firePropertyChange(AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
	4142	Boolean.valueOf(false), Boolean.valueOf(true));
	4143	}
	4144
	4145	/**
	4146	* Fire a visible data property change notification.
	4147	* A 'visible' data property is one that represents
	4148	* something about the way the component appears on the
	4149	* display, where that appearance isn't bound to any other
	4150	* property. It notifies screen readers that the visual
	4151	* appearance of the component has changed, so they can
	4152	* notify the user.
	4153	*/
	4154	public void fireVisibleDataPropertyChange() {
	4155	firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
	4156	Boolean.valueOf(false), Boolean.valueOf(true));
	4157	}
	4158
	4159	// Fire the visible data changes for the model changes.
	4160
	4161	/**
	4162	* Tree Model Node change notification.
	4163	*
	4164	* @param e a Tree Model event
	4165	*/
	4166	public void treeNodesChanged(TreeModelEvent e) {
	4167	fireVisibleDataPropertyChange();
	4168	}
	4169
	4170	/**
	4171	* Tree Model Node change notification.
	4172	*
	4173	* @param e a Tree node insertion event
	4174	*/
	4175	public void treeNodesInserted(TreeModelEvent e) {
	4176	fireVisibleDataPropertyChange();
	4177	}
	4178
	4179	/**
	4180	* Tree Model Node change notification.
	4181	*
	4182	* @param e a Tree node(s) removal event
	4183	*/
	4184	public void treeNodesRemoved(TreeModelEvent e) {
	4185	fireVisibleDataPropertyChange();
	4186	}
	4187
	4188	/**
	4189	* Tree Model structure change change notification.
	4190	*
	4191	* @param e a Tree Model event
	4192	*/
	4193	public void treeStructureChanged(TreeModelEvent e) {
	4194	fireVisibleDataPropertyChange();
	4195	}
	4196
	4197	/**
	4198	* Tree Collapsed notification.
	4199	*
	4200	* @param e a TreeExpansionEvent
	4201	*/
	4202	public void treeCollapsed(TreeExpansionEvent e) {
	4203	fireVisibleDataPropertyChange();
	4204	TreePath path = e.getPath();
	4205	if (path != null) {
	4206	// Set parent to null so AccessibleJTreeNode computes
	4207	// its parent.
	4208	AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
	4209	path,
	4210	null);
	4211	PropertyChangeEvent pce = new PropertyChangeEvent(node,
	4212	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	4213	AccessibleState.EXPANDED,
	4214	AccessibleState.COLLAPSED);
	4215	firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	4216	null, pce);
	4217	}
	4218	}
	4219
	4220	/**
	4221	* Tree Model Expansion notification.
	4222	*
	4223	* @param e a Tree node insertion event
	4224	*/
	4225	public void treeExpanded(TreeExpansionEvent e) {
	4226	fireVisibleDataPropertyChange();
	4227	TreePath path = e.getPath();
	4228	if (path != null) {
	4229	// TIGER - 4839971
	4230	// Set parent to null so AccessibleJTreeNode computes
	4231	// its parent.
	4232	AccessibleJTreeNode node = new AccessibleJTreeNode(JTree.this,
	4233	path,
	4234	null);
	4235	PropertyChangeEvent pce = new PropertyChangeEvent(node,
	4236	AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	4237	AccessibleState.COLLAPSED,
	4238	AccessibleState.EXPANDED);
	4239	firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
	4240	null, pce);
	4241	}
	4242	}
	4243
	4244
	4245	private AccessibleContext getCurrentAccessibleContext() {
	4246	Component c = getCurrentComponent();
	4247	if (c instanceof Accessible) {
	4248	return c.getAccessibleContext();
	4249	} else {
	4250	return null;
	4251	}
	4252	}
	4253
	4254	private Component getCurrentComponent() {
	4255	// is the object visible?
	4256	// if so, get row, selected, focus & leaf state,
	4257	// and then get the renderer component and return it
	4258	TreeModel model = JTree.this.getModel();
	4259	if (model == null) {
	4260	return null;
	4261	}
	4262	TreePath path = new TreePath(model.getRoot());
	4263	if (JTree.this.isVisible(path)) {
	4264	TreeCellRenderer r = JTree.this.getCellRenderer();
	4265	TreeUI ui = JTree.this.getUI();
	4266	if (ui != null) {
	4267	int row = ui.getRowForPath(JTree.this, path);
	4268	int lsr = JTree.this.getLeadSelectionRow();
	4269	boolean hasFocus = JTree.this.isFocusOwner()
	4270	&& (lsr == row);
	4271	boolean selected = JTree.this.isPathSelected(path);
	4272	boolean expanded = JTree.this.isExpanded(path);
	4273
	4274	return r.getTreeCellRendererComponent(JTree.this,
	4275	model.getRoot(), selected, expanded,
	4276	model.isLeaf(model.getRoot()), row, hasFocus);
	4277	}
	4278	}
	4279	return null;
	4280	}
	4281
	4282	// Overridden methods from AccessibleJComponent
	4283
	4284	/**
	4285	* Get the role of this object.
	4286	*
	4287	* @return an instance of AccessibleRole describing the role of the
	4288	* object
	4289	* @see AccessibleRole
	4290	*/
	4291	public AccessibleRole getAccessibleRole() {
	4292	return AccessibleRole.TREE;
	4293	}
	4294
	4295	/**
	4296	* Returns the <code>Accessible</code> child, if one exists,
	4297	* contained at the local coordinate <code>Point</code>.
	4298	* Otherwise returns <code>null</code>.
	4299	*
	4300	* @param p point in local coordinates of this <code>Accessible</code>
	4301	* @return the <code>Accessible</code>, if it exists,
	4302	* at the specified location; else <code>null</code>
	4303	*/
	4304	public Accessible getAccessibleAt(Point p) {
	4305	TreePath path = getClosestPathForLocation(p.x, p.y);
	4306	if (path != null) {
	4307	// JTree.this is NOT the parent; parent will get computed later
	4308	return new AccessibleJTreeNode(JTree.this, path, null);
	4309	} else {
	4310	return null;
	4311	}
	4312	}
	4313
	4314	/**
	4315	* Returns the number of top-level children nodes of this
	4316	* JTree. Each of these nodes may in turn have children nodes.
	4317	*
	4318	* @return the number of accessible children nodes in the tree.
	4319	*/
	4320	public int getAccessibleChildrenCount() {
	4321	TreeModel model = JTree.this.getModel();
	4322	if (model == null) {
	4323	return 0;
	4324	}
	4325	if (isRootVisible()) {
	4326	return 1; // the root node
	4327	}
	4328
	4329	// return the root's first set of children count
	4330	return model.getChildCount(model.getRoot());
	4331	}
	4332
	4333	/**
	4334	* Return the nth Accessible child of the object.
	4335	*
	4336	* @param i zero-based index of child
	4337	* @return the nth Accessible child of the object
	4338	*/
	4339	public Accessible getAccessibleChild(int i) {
	4340	TreeModel model = JTree.this.getModel();
	4341	if (model == null) {
	4342	return null;
	4343	}
	4344	if (isRootVisible()) {
	4345	if (i == 0) { // return the root node Accessible
	4346	Object[] objPath = { model.getRoot() };
	4347	TreePath path = new TreePath(objPath);
	4348	return new AccessibleJTreeNode(JTree.this, path, JTree.this);
	4349	} else {
	4350	return null;
	4351	}
	4352	}
	4353
	4354	// return Accessible for one of root's child nodes
	4355	int count = model.getChildCount(model.getRoot());
	4356	if (i < 0 \|\| i >= count) {
	4357	return null;
	4358	}
	4359	Object obj = model.getChild(model.getRoot(), i);
	4360	Object[] objPath = { model.getRoot(), obj };
	4361	TreePath path = new TreePath(objPath);
	4362	return new AccessibleJTreeNode(JTree.this, path, JTree.this);
	4363	}
	4364
	4365	/**
	4366	* Get the index of this object in its accessible parent.
	4367	*
	4368	* @return the index of this object in its parent. Since a JTree
	4369	* top-level object does not have an accessible parent.
	4370	* @see #getAccessibleParent
	4371	*/
	4372	public int getAccessibleIndexInParent() {
	4373	// didn't ever need to override this...
	4374	return super.getAccessibleIndexInParent();
	4375	}
	4376
	4377	// AccessibleSelection methods
	4378	/**
	4379	* Get the AccessibleSelection associated with this object. In the
	4380	* implementation of the Java Accessibility API for this class,
	4381	* return this object, which is responsible for implementing the
	4382	* AccessibleSelection interface on behalf of itself.
	4383	*
	4384	* @return this object
	4385	*/
	4386	public AccessibleSelection getAccessibleSelection() {
	4387	return this;
	4388	}
	4389
	4390	/**
	4391	* Returns the number of items currently selected.
	4392	* If no items are selected, the return value will be 0.
	4393	*
	4394	* @return the number of items currently selected.
	4395	*/
	4396	public int getAccessibleSelectionCount() {
	4397	Object[] rootPath = new Object[1];
	4398	rootPath[0] = treeModel.getRoot();
	4399	TreePath childPath = new TreePath(rootPath);
	4400	if (JTree.this.isPathSelected(childPath)) {
	4401	return 1;
	4402	} else {
	4403	return 0;
	4404	}
	4405	}
	4406
	4407	/**
	4408	* Returns an Accessible representing the specified selected item
	4409	* in the object. If there isn't a selection, or there are
	4410	* fewer items selected than the integer passed in, the return
	4411	* value will be null.
	4412	*
	4413	* @param i the zero-based index of selected items
	4414	* @return an Accessible containing the selected item
	4415	*/
	4416	public Accessible getAccessibleSelection(int i) {
	4417	// The JTree can have only one accessible child, the root.
	4418	if (i == 0) {
	4419	Object[] rootPath = new Object[1];
	4420	rootPath[0] = treeModel.getRoot();
	4421	TreePath childPath = new TreePath(rootPath);
	4422	if (JTree.this.isPathSelected(childPath)) {
	4423	return new AccessibleJTreeNode(JTree.this, childPath, JTree.this);
	4424	}
	4425	}
	4426	return null;
	4427	}
	4428
	4429	/**
	4430	* Returns true if the current child of this object is selected.
	4431	*
	4432	* @param i the zero-based index of the child in this Accessible object.
	4433	* @see AccessibleContext#getAccessibleChild
	4434	*/
	4435	public boolean isAccessibleChildSelected(int i) {
	4436	// The JTree can have only one accessible child, the root.
	4437	if (i == 0) {
	4438	Object[] rootPath = new Object[1];
	4439	rootPath[0] = treeModel.getRoot();
	4440	TreePath childPath = new TreePath(rootPath);
	4441	return JTree.this.isPathSelected(childPath);
	4442	} else {
	4443	return false;
	4444	}
	4445	}
	4446
	4447	/**
	4448	* Adds the specified selected item in the object to the object's
	4449	* selection. If the object supports multiple selections,
	4450	* the specified item is added to any existing selection, otherwise
	4451	* it replaces any existing selection in the object. If the
	4452	* specified item is already selected, this method has no effect.
	4453	*
	4454	* @param i the zero-based index of selectable items
	4455	*/
	4456	public void addAccessibleSelection(int i) {
	4457	TreeModel model = JTree.this.getModel();
	4458	if (model != null) {
	4459	if (i == 0) {
	4460	Object[] objPath = {model.getRoot()};
	4461	TreePath path = new TreePath(objPath);
	4462	JTree.this.addSelectionPath(path);
	4463	}
	4464	}
	4465	}
	4466
	4467	/**
	4468	* Removes the specified selected item in the object from the object's
	4469	* selection. If the specified item isn't currently selected, this
	4470	* method has no effect.
	4471	*
	4472	* @param i the zero-based index of selectable items
	4473	*/
	4474	public void removeAccessibleSelection(int i) {
	4475	TreeModel model = JTree.this.getModel();
	4476	if (model != null) {
	4477	if (i == 0) {
	4478	Object[] objPath = {model.getRoot()};
	4479	TreePath path = new TreePath(objPath);
	4480	JTree.this.removeSelectionPath(path);
	4481	}
	4482	}
	4483	}
	4484
	4485	/**
	4486	* Clears the selection in the object, so that nothing in the
	4487	* object is selected.
	4488	*/
	4489	public void clearAccessibleSelection() {
	4490	int childCount = getAccessibleChildrenCount();
	4491	for (int i = 0; i < childCount; i++) {
	4492	removeAccessibleSelection(i);
	4493	}
	4494	}
	4495
	4496	/**
	4497	* Causes every selected item in the object to be selected
	4498	* if the object supports multiple selections.
	4499	*/
	4500	public void selectAllAccessibleSelection() {
	4501	TreeModel model = JTree.this.getModel();
	4502	if (model != null) {
	4503	Object[] objPath = {model.getRoot()};
	4504	TreePath path = new TreePath(objPath);
	4505	JTree.this.addSelectionPath(path);
	4506	}
	4507	}
	4508
	4509	/**
	4510	* This class implements accessibility support for the
	4511	* <code>JTree</code> child. It provides an implementation of the
	4512	* Java Accessibility API appropriate to tree nodes.
	4513	*/
	4514	protected class AccessibleJTreeNode extends AccessibleContext
	4515	implements Accessible, AccessibleComponent, AccessibleSelection,
	4516	AccessibleAction {
	4517
	4518	private JTree tree = null;
	4519	private TreeModel treeModel = null;
	4520	private Object obj = null;
	4521	private TreePath path = null;
	4522	private Accessible accessibleParent = null;
	4523	private int index = 0;
	4524	private boolean isLeaf = false;
	4525
	4526	/**
	4527	* Constructs an AccessibleJTreeNode
	4528	* @since 1.4
	4529	*/
	4530	public AccessibleJTreeNode(JTree t, TreePath p, Accessible ap) {
	4531	tree = t;
	4532	path = p;
	4533	accessibleParent = ap;
	4534	treeModel = t.getModel();
	4535	obj = p.getLastPathComponent();
	4536	if (treeModel != null) {
	4537	isLeaf = treeModel.isLeaf(obj);
	4538	}
	4539	}
	4540
	4541	private TreePath getChildTreePath(int i) {
	4542	// Tree nodes can't be so complex that they have
	4543	// two sets of children -> we're ignoring that case
	4544	if (i < 0 \|\| i >= getAccessibleChildrenCount()) {
	4545	return null;
	4546	} else {
	4547	Object childObj = treeModel.getChild(obj, i);
	4548	Object[] objPath = path.getPath();
	4549	Object[] objChildPath = new Object[objPath.length+1];
	4550	java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
	4551	objChildPath[objChildPath.length-1] = childObj;
	4552	return new TreePath(objChildPath);
	4553	}
	4554	}
	4555
	4556	/**
	4557	* Get the AccessibleContext associated with this tree node.
	4558	* In the implementation of the Java Accessibility API for
	4559	* this class, return this object, which is its own
	4560	* AccessibleContext.
	4561	*
	4562	* @return this object
	4563	*/
	4564	public AccessibleContext getAccessibleContext() {
	4565	return this;
	4566	}
	4567
	4568	private AccessibleContext getCurrentAccessibleContext() {
	4569	Component c = getCurrentComponent();
	4570	if (c instanceof Accessible) {
	4571	return c.getAccessibleContext();
	4572	} else {
	4573	return null;
	4574	}
	4575	}
	4576
	4577	private Component getCurrentComponent() {
	4578	// is the object visible?
	4579	// if so, get row, selected, focus & leaf state,
	4580	// and then get the renderer component and return it
	4581	if (tree.isVisible(path)) {
	4582	TreeCellRenderer r = tree.getCellRenderer();
	4583	if (r == null) {
	4584	return null;
	4585	}
	4586	TreeUI ui = tree.getUI();
	4587	if (ui != null) {
	4588	int row = ui.getRowForPath(JTree.this, path);
	4589	boolean selected = tree.isPathSelected(path);
	4590	boolean expanded = tree.isExpanded(path);
	4591	boolean hasFocus = false; // how to tell?? -PK
	4592	return r.getTreeCellRendererComponent(tree, obj,
	4593	selected, expanded, isLeaf, row, hasFocus);
	4594	}
	4595	}
	4596	return null;
	4597	}
	4598
	4599	// AccessibleContext methods
	4600
	4601	/**
	4602	* Get the accessible name of this object.
	4603	*
	4604	* @return the localized name of the object; null if this
	4605	* object does not have a name
	4606	*/
	4607	public String getAccessibleName() {
	4608	AccessibleContext ac = getCurrentAccessibleContext();
	4609	if (ac != null) {
	4610	String name = ac.getAccessibleName();
	4611	if ((name != null) && (name != "")) {
	4612	return ac.getAccessibleName();
	4613	} else {
	4614	return null;
	4615	}
	4616	}
	4617	if ((accessibleName != null) && (accessibleName != "")) {
	4618	return accessibleName;
	4619	} else {
	4620	// fall back to the client property
	4621	return (String)getClientProperty(AccessibleContext.ACCESSIBLE_NAME_PROPERTY);
	4622	}
	4623	}
	4624
	4625	/**
	4626	* Set the localized accessible name of this object.
	4627	*
	4628	* @param s the new localized name of the object.
	4629	*/
	4630	public void setAccessibleName(String s) {
	4631	AccessibleContext ac = getCurrentAccessibleContext();
	4632	if (ac != null) {
	4633	ac.setAccessibleName(s);
	4634	} else {
	4635	super.setAccessibleName(s);
	4636	}
	4637	}
	4638
	4639	//
	4640	// *** should check tooltip text for desc. (needs MouseEvent)
	4641	//
	4642	/**
	4643	* Get the accessible description of this object.
	4644	*
	4645	* @return the localized description of the object; null if
	4646	* this object does not have a description
	4647	*/
	4648	public String getAccessibleDescription() {
	4649	AccessibleContext ac = getCurrentAccessibleContext();
	4650	if (ac != null) {
	4651	return ac.getAccessibleDescription();
	4652	} else {
	4653	return super.getAccessibleDescription();
	4654	}
	4655	}
	4656
	4657	/**
	4658	* Set the accessible description of this object.
	4659	*
	4660	* @param s the new localized description of the object
	4661	*/
	4662	public void setAccessibleDescription(String s) {
	4663	AccessibleContext ac = getCurrentAccessibleContext();
	4664	if (ac != null) {
	4665	ac.setAccessibleDescription(s);
	4666	} else {
	4667	super.setAccessibleDescription(s);
	4668	}
	4669	}
	4670
	4671	/**
	4672	* Get the role of this object.
	4673	*
	4674	* @return an instance of AccessibleRole describing the role of the object
	4675	* @see AccessibleRole
	4676	*/
	4677	public AccessibleRole getAccessibleRole() {
	4678	AccessibleContext ac = getCurrentAccessibleContext();
	4679	if (ac != null) {
	4680	return ac.getAccessibleRole();
	4681	} else {
	4682	return AccessibleRole.UNKNOWN;
	4683	}
	4684	}
	4685
	4686	/**
	4687	* Get the state set of this object.
	4688	*
	4689	* @return an instance of AccessibleStateSet containing the
	4690	* current state set of the object
	4691	* @see AccessibleState
	4692	*/
	4693	public AccessibleStateSet getAccessibleStateSet() {
	4694	AccessibleContext ac = getCurrentAccessibleContext();
	4695	AccessibleStateSet states;
	4696	if (ac != null) {
	4697	states = ac.getAccessibleStateSet();
	4698	} else {
	4699	states = new AccessibleStateSet();
	4700	}
	4701	// need to test here, 'cause the underlying component
	4702	// is a cellRenderer, which is never showing...
	4703	if (isShowing()) {
	4704	states.add(AccessibleState.SHOWING);
	4705	} else if (states.contains(AccessibleState.SHOWING)) {
	4706	states.remove(AccessibleState.SHOWING);
	4707	}
	4708	if (isVisible()) {
	4709	states.add(AccessibleState.VISIBLE);
	4710	} else if (states.contains(AccessibleState.VISIBLE)) {
	4711	states.remove(AccessibleState.VISIBLE);
	4712	}
	4713	if (tree.isPathSelected(path)){
	4714	states.add(AccessibleState.SELECTED);
	4715	}
	4716	if (path == getLeadSelectionPath()) {
	4717	states.add(AccessibleState.ACTIVE);
	4718	}
	4719	if (!isLeaf) {
	4720	states.add(AccessibleState.EXPANDABLE);
	4721	}
	4722	if (tree.isExpanded(path)) {
	4723	states.add(AccessibleState.EXPANDED);
	4724	} else {
	4725	states.add(AccessibleState.COLLAPSED);
	4726	}
	4727	if (tree.isEditable()) {
	4728	states.add(AccessibleState.EDITABLE);
	4729	}
	4730	return states;
	4731	}
	4732
	4733	/**
	4734	* Get the Accessible parent of this object.
	4735	*
	4736	* @return the Accessible parent of this object; null if this
	4737	* object does not have an Accessible parent
	4738	*/
	4739	public Accessible getAccessibleParent() {
	4740	// someone wants to know, so we need to create our parent
	4741	// if we don't have one (hey, we're a talented kid!)
	4742	if (accessibleParent == null) {
	4743	Object[] objPath = path.getPath();
	4744	if (objPath.length > 1) {
	4745	Object objParent = objPath[objPath.length-2];
	4746	if (treeModel != null) {
	4747	index = treeModel.getIndexOfChild(objParent, obj);
	4748	}
	4749	Object[] objParentPath = new Object[objPath.length-1];
	4750	java.lang.System.arraycopy(objPath, 0, objParentPath,
	4751	0, objPath.length-1);
	4752	TreePath parentPath = new TreePath(objParentPath);
	4753	accessibleParent = new AccessibleJTreeNode(tree,
	4754	parentPath,
	4755	null);
	4756	this.setAccessibleParent(accessibleParent);
	4757	} else if (treeModel != null) {
	4758	accessibleParent = tree; // we're the top!
	4759	index = 0; // we're an only child!
	4760	this.setAccessibleParent(accessibleParent);
	4761	}
	4762	}
	4763	return accessibleParent;
	4764	}
	4765
	4766	/**
	4767	* Get the index of this object in its accessible parent.
	4768	*
	4769	* @return the index of this object in its parent; -1 if this
	4770	* object does not have an accessible parent.
	4771	* @see #getAccessibleParent
	4772	*/
	4773	public int getAccessibleIndexInParent() {
	4774	// index is invalid 'till we have an accessibleParent...
	4775	if (accessibleParent == null) {
	4776	getAccessibleParent();
	4777	}
	4778	Object[] objPath = path.getPath();
	4779	if (objPath.length > 1) {
	4780	Object objParent = objPath[objPath.length-2];
	4781	if (treeModel != null) {
	4782	index = treeModel.getIndexOfChild(objParent, obj);
	4783	}
	4784	}
	4785	return index;
	4786	}
	4787
	4788	/**
	4789	* Returns the number of accessible children in the object.
	4790	*
	4791	* @return the number of accessible children in the object.
	4792	*/
	4793	public int getAccessibleChildrenCount() {
	4794	// Tree nodes can't be so complex that they have
	4795	// two sets of children -> we're ignoring that case
	4796	return treeModel.getChildCount(obj);
	4797	}
	4798
	4799	/**
	4800	* Return the specified Accessible child of the object.
	4801	*
	4802	* @param i zero-based index of child
	4803	* @return the Accessible child of the object
	4804	*/
	4805	public Accessible getAccessibleChild(int i) {
	4806	// Tree nodes can't be so complex that they have
	4807	// two sets of children -> we're ignoring that case
	4808	if (i < 0 \|\| i >= getAccessibleChildrenCount()) {
	4809	return null;
	4810	} else {
	4811	Object childObj = treeModel.getChild(obj, i);
	4812	Object[] objPath = path.getPath();
	4813	Object[] objChildPath = new Object[objPath.length+1];
	4814	java.lang.System.arraycopy(objPath, 0, objChildPath, 0, objPath.length);
	4815	objChildPath[objChildPath.length-1] = childObj;
	4816	TreePath childPath = new TreePath(objChildPath);
	4817	return new AccessibleJTreeNode(JTree.this, childPath, this);
	4818	}
	4819	}
	4820
	4821	/**
	4822	* Gets the locale of the component. If the component does not have
	4823	* a locale, then the locale of its parent is returned.
	4824	*
	4825	* @return This component's locale. If this component does not have
	4826	* a locale, the locale of its parent is returned.
	4827	* @exception IllegalComponentStateException
	4828	* If the Component does not have its own locale and has not yet
	4829	* been added to a containment hierarchy such that the locale can be
	4830	* determined from the containing parent.
	4831	* @see #setLocale
	4832	*/
	4833	public Locale getLocale() {
	4834	AccessibleContext ac = getCurrentAccessibleContext();
	4835	if (ac != null) {
	4836	return ac.getLocale();
	4837	} else {
	4838	return tree.getLocale();
	4839	}
	4840	}
	4841
	4842	/**
	4843	* Add a PropertyChangeListener to the listener list.
	4844	* The listener is registered for all properties.
	4845	*
	4846	* @param l The PropertyChangeListener to be added
	4847	*/
	4848	public void addPropertyChangeListener(PropertyChangeListener l) {
	4849	AccessibleContext ac = getCurrentAccessibleContext();
	4850	if (ac != null) {
	4851	ac.addPropertyChangeListener(l);
	4852	} else {
	4853	super.addPropertyChangeListener(l);
	4854	}
	4855	}
	4856
	4857	/**
	4858	* Remove a PropertyChangeListener from the listener list.
	4859	* This removes a PropertyChangeListener that was registered
	4860	* for all properties.
	4861	*
	4862	* @param l The PropertyChangeListener to be removed
	4863	*/
	4864	public void removePropertyChangeListener(PropertyChangeListener l) {
	4865	AccessibleContext ac = getCurrentAccessibleContext();
	4866	if (ac != null) {
	4867	ac.removePropertyChangeListener(l);
	4868	} else {
	4869	super.removePropertyChangeListener(l);
	4870	}
	4871	}
	4872
	4873	/**
	4874	* Get the AccessibleAction associated with this object. In the
	4875	* implementation of the Java Accessibility API for this class,
	4876	* return this object, which is responsible for implementing the
	4877	* AccessibleAction interface on behalf of itself.
	4878	*
	4879	* @return this object
	4880	*/
	4881	public AccessibleAction getAccessibleAction() {
	4882	return this;
	4883	}
	4884
	4885	/**
	4886	* Get the AccessibleComponent associated with this object. In the
	4887	* implementation of the Java Accessibility API for this class,
	4888	* return this object, which is responsible for implementing the
	4889	* AccessibleComponent interface on behalf of itself.
	4890	*
	4891	* @return this object
	4892	*/
	4893	public AccessibleComponent getAccessibleComponent() {
	4894	return this; // to override getBounds()
	4895	}
	4896
	4897	/**
	4898	* Get the AccessibleSelection associated with this object if one
	4899	* exists. Otherwise return null.
	4900	*
	4901	* @return the AccessibleSelection, or null
	4902	*/
	4903	public AccessibleSelection getAccessibleSelection() {
	4904	AccessibleContext ac = getCurrentAccessibleContext();
	4905	if (ac != null && isLeaf) {
	4906	return getCurrentAccessibleContext().getAccessibleSelection();
	4907	} else {
	4908	return this;
	4909	}
	4910	}
	4911
	4912	/**
	4913	* Get the AccessibleText associated with this object if one
	4914	* exists. Otherwise return null.
	4915	*
	4916	* @return the AccessibleText, or null
	4917	*/
	4918	public AccessibleText getAccessibleText() {
	4919	AccessibleContext ac = getCurrentAccessibleContext();
	4920	if (ac != null) {
	4921	return getCurrentAccessibleContext().getAccessibleText();
	4922	} else {
	4923	return null;
	4924	}
	4925	}
	4926
	4927	/**
	4928	* Get the AccessibleValue associated with this object if one
	4929	* exists. Otherwise return null.
	4930	*
	4931	* @return the AccessibleValue, or null
	4932	*/
	4933	public AccessibleValue getAccessibleValue() {
	4934	AccessibleContext ac = getCurrentAccessibleContext();
	4935	if (ac != null) {
	4936	return getCurrentAccessibleContext().getAccessibleValue();
	4937	} else {
	4938	return null;
	4939	}
	4940	}
	4941
	4942
	4943	// AccessibleComponent methods
	4944
	4945	/**
	4946	* Get the background color of this object.
	4947	*
	4948	* @return the background color, if supported, of the object;
	4949	* otherwise, null
	4950	*/
	4951	public Color getBackground() {
	4952	AccessibleContext ac = getCurrentAccessibleContext();
	4953	if (ac instanceof AccessibleComponent) {
	4954	return ((AccessibleComponent) ac).getBackground();
	4955	} else {
	4956	Component c = getCurrentComponent();
	4957	if (c != null) {
	4958	return c.getBackground();
	4959	} else {
	4960	return null;
	4961	}
	4962	}
	4963	}
	4964
	4965	/**
	4966	* Set the background color of this object.
	4967	*
	4968	* @param c the new Color for the background
	4969	*/
	4970	public void setBackground(Color c) {
	4971	AccessibleContext ac = getCurrentAccessibleContext();
	4972	if (ac instanceof AccessibleComponent) {
	4973	((AccessibleComponent) ac).setBackground(c);
	4974	} else {
	4975	Component cp = getCurrentComponent();
	4976	if (cp != null) {
	4977	cp.setBackground(c);
	4978	}
	4979	}
	4980	}
	4981
	4982
	4983	/**
	4984	* Get the foreground color of this object.
	4985	*
	4986	* @return the foreground color, if supported, of the object;
	4987	* otherwise, null
	4988	*/
	4989	public Color getForeground() {
	4990	AccessibleContext ac = getCurrentAccessibleContext();
	4991	if (ac instanceof AccessibleComponent) {
	4992	return ((AccessibleComponent) ac).getForeground();
	4993	} else {
	4994	Component c = getCurrentComponent();
	4995	if (c != null) {
	4996	return c.getForeground();
	4997	} else {
	4998	return null;
	4999	}

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