1 /*
2 * Copyright (c) 1998, 2015, 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 package javax.swing.tree;
26
27 import javax.swing.event.TreeModelEvent;
28 import java.awt.Rectangle;
29 import java.beans.BeanProperty;
30 import java.util.Enumeration;
31 import java.util.Hashtable;
32 import java.util.NoSuchElementException;
33 import java.util.Stack;
34 import java.util.Vector;
35
36 import sun.swing.SwingUtilities2;
37
38 /**
39 * NOTE: This will become more open in a future release.
40 * <p>
41 * <strong>Warning:</strong>
42 * Serialized objects of this class will not be compatible with
43 * future Swing releases. The current serialization support is
44 * appropriate for short term storage or RMI between applications running
45 * the same version of Swing. As of 1.4, support for long term storage
46 * of all JavaBeans™
47 * has been added to the <code>java.beans</code> package.
48 * Please see {@link java.beans.XMLEncoder}.
49 *
50 * @author Rob Davis
51 * @author Ray Ryan
52 * @author Scott Violet
53 */
54 @SuppressWarnings("serial") // Same-version serialization only
55 public class VariableHeightLayoutCache extends AbstractLayoutCache {
56 /**
57 * The array of nodes that are currently visible, in the order they
58 * are displayed.
59 */
60 private Vector<Object> visibleNodes;
61
62 /**
63 * This is set to true if one of the entries has an invalid size.
64 */
65 private boolean updateNodeSizes;
66
67 /**
68 * The root node of the internal cache of nodes that have been shown.
69 * If the treeModel is vending a network rather than a true tree,
70 * there may be one cached node for each path to a modeled node.
71 */
72 private TreeStateNode root;
73
74 /**
75 * Used in getting sizes for nodes to avoid creating a new Rectangle
76 * every time a size is needed.
77 */
78 private Rectangle boundsBuffer;
79
80 /**
81 * Maps from <code>TreePath</code> to a <code>TreeStateNode</code>.
82 */
83 private Hashtable<TreePath, TreeStateNode> treePathMapping;
84
85 /**
86 * A stack of stacks.
87 */
88 private Stack<Stack<TreePath>> tempStacks;
89
90
91 /**
92 * Constructs a {@code VariableHeightLayoutCache}.
93 */
94 public VariableHeightLayoutCache() {
95 super();
96 tempStacks = new Stack<Stack<TreePath>>();
97 visibleNodes = new Vector<Object>();
98 boundsBuffer = new Rectangle();
99 treePathMapping = new Hashtable<TreePath, TreeStateNode>();
100 }
101
102 /**
103 * Sets the <code>TreeModel</code> that will provide the data.
104 *
105 * @param newModel the <code>TreeModel</code> that is to provide the data
106 */
107 @BeanProperty(description
108 = "The TreeModel that will provide the data.")
109 public void setModel(TreeModel newModel) {
110 super.setModel(newModel);
111 rebuild(false);
112 }
113
114 /**
115 * Determines whether or not the root node from
116 * the <code>TreeModel</code> is visible.
117 *
118 * @param rootVisible true if the root node of the tree is to be displayed
119 * @see #rootVisible
120 */
121 @BeanProperty(description
122 = "Whether or not the root node from the TreeModel is visible.")
123 public void setRootVisible(boolean rootVisible) {
124 if(isRootVisible() != rootVisible && root != null) {
125 if(rootVisible) {
126 root.updatePreferredSize(0);
127 visibleNodes.insertElementAt(root, 0);
128 }
129 else if(visibleNodes.size() > 0) {
130 visibleNodes.removeElementAt(0);
131 if(treeSelectionModel != null)
132 treeSelectionModel.removeSelectionPath
133 (root.getTreePath());
134 }
135 if(treeSelectionModel != null)
136 treeSelectionModel.resetRowSelection();
137 if(getRowCount() > 0)
138 getNode(0).setYOrigin(0);
139 updateYLocationsFrom(0);
140 visibleNodesChanged();
141 }
142 super.setRootVisible(rootVisible);
143 }
144
145 /**
146 * Sets the height of each cell. If the specified value
147 * is less than or equal to zero the current cell renderer is
148 * queried for each row's height.
149 *
150 * @param rowHeight the height of each cell, in pixels
151 */
152 @BeanProperty(description
153 = "The height of each cell.")
154 public void setRowHeight(int rowHeight) {
155 if(rowHeight != getRowHeight()) {
156 super.setRowHeight(rowHeight);
157 invalidateSizes();
158 this.visibleNodesChanged();
159 }
160 }
161
162 /**
163 * Sets the renderer that is responsible for drawing nodes in the tree.
164 * @param nd the renderer
165 */
166 public void setNodeDimensions(NodeDimensions nd) {
167 super.setNodeDimensions(nd);
168 invalidateSizes();
169 visibleNodesChanged();
170 }
171
172 /**
173 * Marks the path <code>path</code> expanded state to
174 * <code>isExpanded</code>.
175 * @param path the <code>TreePath</code> of interest
176 * @param isExpanded true if the path should be expanded, otherwise false
177 */
178 public void setExpandedState(TreePath path, boolean isExpanded) {
179 if(path != null) {
180 if(isExpanded)
181 ensurePathIsExpanded(path, true);
182 else {
183 TreeStateNode node = getNodeForPath(path, false, true);
184
185 if(node != null) {
186 node.makeVisible();
187 node.collapse();
188 }
189 }
190 }
191 }
192
193 /**
194 * Returns true if the path is expanded, and visible.
195 * @return true if the path is expanded and visible, otherwise false
196 */
197 public boolean getExpandedState(TreePath path) {
198 TreeStateNode node = getNodeForPath(path, true, false);
199
200 return (node != null) ? (node.isVisible() && node.isExpanded()) :
201 false;
202 }
203
204 /**
205 * Returns the <code>Rectangle</code> enclosing the label portion
206 * into which the item identified by <code>path</code> will be drawn.
207 *
208 * @param path the path to be drawn
209 * @param placeIn the bounds of the enclosing rectangle
210 * @return the bounds of the enclosing rectangle or <code>null</code>
211 * if the node could not be ascertained
212 */
213 public Rectangle getBounds(TreePath path, Rectangle placeIn) {
214 TreeStateNode node = getNodeForPath(path, true, false);
215
216 if(node != null) {
217 if(updateNodeSizes)
218 updateNodeSizes(false);
219 return node.getNodeBounds(placeIn);
220 }
221 return null;
222 }
223
224 /**
225 * Returns the path for <code>row</code>. If <code>row</code>
226 * is not visible, <code>null</code> is returned.
227 *
228 * @param row the location of interest
229 * @return the path for <code>row</code>, or <code>null</code>
230 * if <code>row</code> is not visible
231 */
232 public TreePath getPathForRow(int row) {
233 if(row >= 0 && row < getRowCount()) {
234 return getNode(row).getTreePath();
235 }
236 return null;
237 }
238
239 /**
240 * Returns the row where the last item identified in path is visible.
241 * Will return -1 if any of the elements in path are not
242 * currently visible.
243 *
244 * @param path the <code>TreePath</code> of interest
245 * @return the row where the last item in path is visible
246 */
247 public int getRowForPath(TreePath path) {
248 if(path == null)
249 return -1;
250
251 TreeStateNode visNode = getNodeForPath(path, true, false);
252
253 if(visNode != null)
254 return visNode.getRow();
255 return -1;
256 }
257
258 /**
259 * Returns the number of visible rows.
260 * @return the number of visible rows
261 */
262 public int getRowCount() {
263 return visibleNodes.size();
264 }
265
266 /**
267 * Instructs the <code>LayoutCache</code> that the bounds for
268 * <code>path</code> are invalid, and need to be updated.
269 *
270 * @param path the <code>TreePath</code> which is now invalid
271 */
272 public void invalidatePathBounds(TreePath path) {
273 TreeStateNode node = getNodeForPath(path, true, false);
274
275 if(node != null) {
276 node.markSizeInvalid();
277 if(node.isVisible())
278 updateYLocationsFrom(node.getRow());
279 }
280 }
281
282 /**
283 * Returns the preferred height.
284 * @return the preferred height
285 */
286 public int getPreferredHeight() {
287 // Get the height
288 int rowCount = getRowCount();
289
290 if(rowCount > 0) {
291 TreeStateNode node = getNode(rowCount - 1);
292
293 return node.getYOrigin() + node.getPreferredHeight();
294 }
295 return 0;
296 }
297
298 /**
299 * Returns the preferred width and height for the region in
300 * <code>visibleRegion</code>.
301 *
302 * @param bounds the region being queried
303 */
304 public int getPreferredWidth(Rectangle bounds) {
305 if(updateNodeSizes)
306 updateNodeSizes(false);
307
308 return getMaxNodeWidth();
309 }
310
311 /**
312 * Returns the path to the node that is closest to x,y. If
313 * there is nothing currently visible this will return <code>null</code>,
314 * otherwise it will always return a valid path.
315 * If you need to test if the
316 * returned object is exactly at x, y you should get the bounds for
317 * the returned path and test x, y against that.
318 *
319 * @param x the x-coordinate
320 * @param y the y-coordinate
321 * @return the path to the node that is closest to x, y
322 */
323 public TreePath getPathClosestTo(int x, int y) {
324 if(getRowCount() == 0)
325 return null;
326
327 if(updateNodeSizes)
328 updateNodeSizes(false);
329
330 int row = getRowContainingYLocation(y);
331
332 return getNode(row).getTreePath();
333 }
334
335 /**
336 * Returns an <code>Enumerator</code> that increments over the visible paths
337 * starting at the passed in location. The ordering of the enumeration
338 * is based on how the paths are displayed.
339 *
340 * @param path the location in the <code>TreePath</code> to start
341 * @return an <code>Enumerator</code> that increments over the visible
342 * paths
343 */
344 public Enumeration<TreePath> getVisiblePathsFrom(TreePath path) {
345 TreeStateNode node = getNodeForPath(path, true, false);
346
347 if(node != null) {
348 return new VisibleTreeStateNodeEnumeration(node);
349 }
350 return null;
351 }
352
353 /**
354 * Returns the number of visible children for <code>path</code>.
355 * @return the number of visible children for <code>path</code>
356 */
357 public int getVisibleChildCount(TreePath path) {
358 TreeStateNode node = getNodeForPath(path, true, false);
359
360 return (node != null) ? node.getVisibleChildCount() : 0;
361 }
362
363 /**
364 * Informs the <code>TreeState</code> that it needs to recalculate
365 * all the sizes it is referencing.
366 */
367 public void invalidateSizes() {
368 if(root != null)
369 root.deepMarkSizeInvalid();
370 if(!isFixedRowHeight() && visibleNodes.size() > 0) {
371 updateNodeSizes(true);
372 }
373 }
374
375 /**
376 * Returns true if the value identified by <code>path</code> is
377 * currently expanded.
378 * @return true if the value identified by <code>path</code> is
379 * currently expanded
380 */
381 public boolean isExpanded(TreePath path) {
382 if(path != null) {
383 TreeStateNode lastNode = getNodeForPath(path, true, false);
384
385 return (lastNode != null && lastNode.isExpanded());
386 }
387 return false;
388 }
389
390 //
391 // TreeModelListener methods
392 //
393
394 /**
395 * Invoked after a node (or a set of siblings) has changed in some
396 * way. The node(s) have not changed locations in the tree or
397 * altered their children arrays, but other attributes have
398 * changed and may affect presentation. Example: the name of a
399 * file has changed, but it is in the same location in the file
400 * system.
401 *
402 * <p><code>e.path</code> returns the path the parent of the
403 * changed node(s).
404 *
405 * <p><code>e.childIndices</code> returns the index(es) of the
406 * changed node(s).
407 *
408 * @param e the <code>TreeModelEvent</code> of interest
409 */
410 public void treeNodesChanged(TreeModelEvent e) {
411 if(e != null) {
412 int changedIndexs[];
413 TreeStateNode changedNode;
414
415 changedIndexs = e.getChildIndices();
416 changedNode = getNodeForPath(SwingUtilities2.getTreePath(e, getModel()), false, false);
417 if(changedNode != null) {
418 Object changedValue = changedNode.getValue();
419
420 /* Update the size of the changed node, as well as all the
421 child indexs that are passed in. */
422 changedNode.updatePreferredSize();
423 if(changedNode.hasBeenExpanded() && changedIndexs != null) {
424 int counter;
425 TreeStateNode changedChildNode;
426
427 for(counter = 0; counter < changedIndexs.length;
428 counter++) {
429 changedChildNode = (TreeStateNode)changedNode
430 .getChildAt(changedIndexs[counter]);
431 /* Reset the user object. */
432 changedChildNode.setUserObject
433 (treeModel.getChild(changedValue,
434 changedIndexs[counter]));
435 changedChildNode.updatePreferredSize();
436 }
437 }
438 else if (changedNode == root) {
439 // Null indicies for root indicates it changed.
440 changedNode.updatePreferredSize();
441 }
442 if(!isFixedRowHeight()) {
443 int aRow = changedNode.getRow();
444
445 if(aRow != -1)
446 this.updateYLocationsFrom(aRow);
447 }
448 this.visibleNodesChanged();
449 }
450 }
451 }
452
453
454 /**
455 * Invoked after nodes have been inserted into the tree.
456 *
457 * <p><code>e.path</code> returns the parent of the new nodes.
458 * <p><code>e.childIndices</code> returns the indices of the new nodes in
459 * ascending order.
460 *
461 * @param e the <code>TreeModelEvent</code> of interest
462 */
463 public void treeNodesInserted(TreeModelEvent e) {
464 if(e != null) {
465 int changedIndexs[];
466 TreeStateNode changedParentNode;
467
468 changedIndexs = e.getChildIndices();
469 changedParentNode = getNodeForPath(SwingUtilities2.getTreePath(e, getModel()), false, false);
470 /* Only need to update the children if the node has been
471 expanded once. */
472 // PENDING(scott): make sure childIndexs is sorted!
473 if(changedParentNode != null && changedIndexs != null &&
474 changedIndexs.length > 0) {
475 if(changedParentNode.hasBeenExpanded()) {
476 boolean makeVisible;
477 int counter;
478 Object changedParent;
479 TreeStateNode newNode;
480 int oldChildCount = changedParentNode.
481 getChildCount();
482
483 changedParent = changedParentNode.getValue();
484 makeVisible = ((changedParentNode == root &&
485 !rootVisible) ||
486 (changedParentNode.getRow() != -1 &&
487 changedParentNode.isExpanded()));
488 for(counter = 0;counter < changedIndexs.length;counter++)
489 {
490 newNode = this.createNodeAt(changedParentNode,
491 changedIndexs[counter]);
492 }
493 if(oldChildCount == 0) {
494 // Update the size of the parent.
495 changedParentNode.updatePreferredSize();
496 }
497 if(treeSelectionModel != null)
498 treeSelectionModel.resetRowSelection();
499 /* Update the y origins from the index of the parent
500 to the end of the visible rows. */
501 if(!isFixedRowHeight() && (makeVisible ||
502 (oldChildCount == 0 &&
503 changedParentNode.isVisible()))) {
504 if(changedParentNode == root)
505 this.updateYLocationsFrom(0);
506 else
507 this.updateYLocationsFrom(changedParentNode.
508 getRow());
509 this.visibleNodesChanged();
510 }
511 else if(makeVisible)
512 this.visibleNodesChanged();
513 }
514 else if(treeModel.getChildCount(changedParentNode.getValue())
515 - changedIndexs.length == 0) {
516 changedParentNode.updatePreferredSize();
517 if(!isFixedRowHeight() && changedParentNode.isVisible())
518 updateYLocationsFrom(changedParentNode.getRow());
519 }
520 }
521 }
522 }
523
524 /**
525 * Invoked after nodes have been removed from the tree. Note that
526 * if a subtree is removed from the tree, this method may only be
527 * invoked once for the root of the removed subtree, not once for
528 * each individual set of siblings removed.
529 *
530 * <p><code>e.path</code> returns the former parent of the deleted nodes.
531 *
532 * <p><code>e.childIndices</code> returns the indices the nodes had
533 * before they were deleted in ascending order.
534 *
535 * @param e the <code>TreeModelEvent</code> of interest
536 */
537 public void treeNodesRemoved(TreeModelEvent e) {
538 if(e != null) {
539 int changedIndexs[];
540 TreeStateNode changedParentNode;
541
542 changedIndexs = e.getChildIndices();
543 changedParentNode = getNodeForPath(SwingUtilities2.getTreePath(e, getModel()), false, false);
544 // PENDING(scott): make sure that changedIndexs are sorted in
545 // ascending order.
546 if(changedParentNode != null && changedIndexs != null &&
547 changedIndexs.length > 0) {
548 if(changedParentNode.hasBeenExpanded()) {
549 boolean makeInvisible;
550 int counter;
551 int removedRow;
552 TreeStateNode removedNode;
553
554 makeInvisible = ((changedParentNode == root &&
555 !rootVisible) ||
556 (changedParentNode.getRow() != -1 &&
557 changedParentNode.isExpanded()));
558 for(counter = changedIndexs.length - 1;counter >= 0;
559 counter--) {
560 removedNode = (TreeStateNode)changedParentNode.
561 getChildAt(changedIndexs[counter]);
562 if(removedNode.isExpanded()) {
563 removedNode.collapse(false);
564 }
565
566 /* Let the selection model now. */
567 if(makeInvisible) {
568 removedRow = removedNode.getRow();
569 if(removedRow != -1) {
570 visibleNodes.removeElementAt(removedRow);
571 }
572 }
573 changedParentNode.remove(changedIndexs[counter]);
574 }
575 if(changedParentNode.getChildCount() == 0) {
576 // Update the size of the parent.
577 changedParentNode.updatePreferredSize();
578 if (changedParentNode.isExpanded() &&
579 changedParentNode.isLeaf()) {
580 // Node has become a leaf, collapse it.
581 changedParentNode.collapse(false);
582 }
583 }
584 if(treeSelectionModel != null)
585 treeSelectionModel.resetRowSelection();
586 /* Update the y origins from the index of the parent
587 to the end of the visible rows. */
588 if(!isFixedRowHeight() && (makeInvisible ||
589 (changedParentNode.getChildCount() == 0 &&
590 changedParentNode.isVisible()))) {
591 if(changedParentNode == root) {
592 /* It is possible for first row to have been
593 removed if the root isn't visible, in which
594 case ylocations will be off! */
595 if(getRowCount() > 0)
596 getNode(0).setYOrigin(0);
597 updateYLocationsFrom(0);
598 }
599 else
600 updateYLocationsFrom(changedParentNode.getRow());
601 this.visibleNodesChanged();
602 }
603 else if(makeInvisible)
604 this.visibleNodesChanged();
605 }
606 else if(treeModel.getChildCount(changedParentNode.getValue())
607 == 0) {
608 changedParentNode.updatePreferredSize();
609 if(!isFixedRowHeight() && changedParentNode.isVisible())
610 this.updateYLocationsFrom(changedParentNode.getRow());
611 }
612 }
613 }
614 }
615
616 /**
617 * Invoked after the tree has drastically changed structure from a
618 * given node down. If the path returned by <code>e.getPath</code>
619 * is of length one and the first element does not identify the
620 * current root node the first element should become the new root
621 * of the tree.
622 *
623 * <p><code>e.path</code> holds the path to the node.
624 * <p><code>e.childIndices</code> returns <code>null</code>.
625 *
626 * @param e the <code>TreeModelEvent</code> of interest
627 */
628 public void treeStructureChanged(TreeModelEvent e) {
629 if(e != null)
630 {
631 TreePath changedPath = SwingUtilities2.getTreePath(e, getModel());
632 TreeStateNode changedNode;
633
634 changedNode = getNodeForPath(changedPath, false, false);
635
636 // Check if root has changed, either to a null root, or
637 // to an entirely new root.
638 if(changedNode == root ||
639 (changedNode == null &&
640 ((changedPath == null && treeModel != null &&
641 treeModel.getRoot() == null) ||
642 (changedPath != null && changedPath.getPathCount() == 1)))) {
643 rebuild(true);
644 }
645 else if(changedNode != null) {
646 int nodeIndex, oldRow;
647 TreeStateNode newNode, parent;
648 boolean wasExpanded, wasVisible;
649 int newIndex;
650
651 wasExpanded = changedNode.isExpanded();
652 wasVisible = (changedNode.getRow() != -1);
653 /* Remove the current node and recreate a new one. */
654 parent = (TreeStateNode)changedNode.getParent();
655 nodeIndex = parent.getIndex(changedNode);
656 if(wasVisible && wasExpanded) {
657 changedNode.collapse(false);
658 }
659 if(wasVisible)
660 visibleNodes.removeElement(changedNode);
661 changedNode.removeFromParent();
662 createNodeAt(parent, nodeIndex);
663 newNode = (TreeStateNode)parent.getChildAt(nodeIndex);
664 if(wasVisible && wasExpanded)
665 newNode.expand(false);
666 newIndex = newNode.getRow();
667 if(!isFixedRowHeight() && wasVisible) {
668 if(newIndex == 0)
669 updateYLocationsFrom(newIndex);
670 else
671 updateYLocationsFrom(newIndex - 1);
672 this.visibleNodesChanged();
673 }
674 else if(wasVisible)
675 this.visibleNodesChanged();
676 }
677 }
678 }
679
680
681 //
682 // Local methods
683 //
684
685 private void visibleNodesChanged() {
686 }
687
688 /**
689 * Adds a mapping for node.
690 */
691 private void addMapping(TreeStateNode node) {
692 treePathMapping.put(node.getTreePath(), node);
693 }
694
695 /**
696 * Removes the mapping for a previously added node.
697 */
698 private void removeMapping(TreeStateNode node) {
699 treePathMapping.remove(node.getTreePath());
700 }
701
702 /**
703 * Returns the node previously added for <code>path</code>. This may
704 * return null, if you to create a node use getNodeForPath.
705 */
706 private TreeStateNode getMapping(TreePath path) {
707 return treePathMapping.get(path);
708 }
709
710 /**
711 * Retursn the bounds for row, <code>row</code> by reference in
712 * <code>placeIn</code>. If <code>placeIn</code> is null a new
713 * Rectangle will be created and returned.
714 */
715 private Rectangle getBounds(int row, Rectangle placeIn) {
716 if(updateNodeSizes)
717 updateNodeSizes(false);
718
719 if(row >= 0 && row < getRowCount()) {
720 return getNode(row).getNodeBounds(placeIn);
721 }
722 return null;
723 }
724
725 /**
726 * Completely rebuild the tree, all expanded state, and node caches are
727 * removed. All nodes are collapsed, except the root.
728 */
729 private void rebuild(boolean clearSelection) {
730 Object rootObject;
731
732 treePathMapping.clear();
733 if(treeModel != null && (rootObject = treeModel.getRoot()) != null) {
734 root = createNodeForValue(rootObject);
735 root.path = new TreePath(rootObject);
736 addMapping(root);
737 root.updatePreferredSize(0);
738 visibleNodes.removeAllElements();
739 if (isRootVisible())
740 visibleNodes.addElement(root);
741 if(!root.isExpanded())
742 root.expand();
743 else {
744 Enumeration<?> cursor = root.children();
745 while(cursor.hasMoreElements()) {
746 visibleNodes.addElement(cursor.nextElement());
747 }
748 if(!isFixedRowHeight())
749 updateYLocationsFrom(0);
750 }
751 }
752 else {
753 visibleNodes.removeAllElements();
754 root = null;
755 }
756 if(clearSelection && treeSelectionModel != null) {
757 treeSelectionModel.clearSelection();
758 }
759 this.visibleNodesChanged();
760 }
761
762 /**
763 * Creates a new node to represent the node at <I>childIndex</I> in
764 * <I>parent</I>s children. This should be called if the node doesn't
765 * already exist and <I>parent</I> has been expanded at least once.
766 * The newly created node will be made visible if <I>parent</I> is
767 * currently expanded. This does not update the position of any
768 * cells, nor update the selection if it needs to be. If succesful
769 * in creating the new TreeStateNode, it is returned, otherwise
770 * null is returned.
771 */
772 private TreeStateNode createNodeAt(TreeStateNode parent,
773 int childIndex) {
774 boolean isParentRoot;
775 Object newValue;
776 TreeStateNode newChildNode;
777
778 newValue = treeModel.getChild(parent.getValue(), childIndex);
779 newChildNode = createNodeForValue(newValue);
780 parent.insert(newChildNode, childIndex);
781 newChildNode.updatePreferredSize(-1);
782 isParentRoot = (parent == root);
783 if(newChildNode != null && parent.isExpanded() &&
784 (parent.getRow() != -1 || isParentRoot)) {
785 int newRow;
786
787 /* Find the new row to insert this newly visible node at. */
788 if(childIndex == 0) {
789 if(isParentRoot && !isRootVisible())
790 newRow = 0;
791 else
792 newRow = parent.getRow() + 1;
793 }
794 else if(childIndex == parent.getChildCount())
795 newRow = parent.getLastVisibleNode().getRow() + 1;
796 else {
797 TreeStateNode previousNode;
798
799 previousNode = (TreeStateNode)parent.
800 getChildAt(childIndex - 1);
801 newRow = previousNode.getLastVisibleNode().getRow() + 1;
802 }
803 visibleNodes.insertElementAt(newChildNode, newRow);
804 }
805 return newChildNode;
806 }
807
808 /**
809 * Returns the TreeStateNode identified by path. This mirrors
810 * the behavior of getNodeForPath, but tries to take advantage of
811 * path if it is an instance of AbstractTreePath.
812 */
813 private TreeStateNode getNodeForPath(TreePath path,
814 boolean onlyIfVisible,
815 boolean shouldCreate) {
816 if(path != null) {
817 TreeStateNode node;
818
819 node = getMapping(path);
820 if(node != null) {
821 if(onlyIfVisible && !node.isVisible())
822 return null;
823 return node;
824 }
825
826 // Check all the parent paths, until a match is found.
827 Stack<TreePath> paths;
828
829 if(tempStacks.size() == 0) {
830 paths = new Stack<TreePath>();
831 }
832 else {
833 paths = tempStacks.pop();
834 }
835
836 try {
837 paths.push(path);
838 path = path.getParentPath();
839 node = null;
840 while(path != null) {
841 node = getMapping(path);
842 if(node != null) {
843 // Found a match, create entries for all paths in
844 // paths.
845 while(node != null && paths.size() > 0) {
846 path = paths.pop();
847 node.getLoadedChildren(shouldCreate);
848
849 int childIndex = treeModel.
850 getIndexOfChild(node.getUserObject(),
851 path.getLastPathComponent());
852
853 if(childIndex == -1 ||
854 childIndex >= node.getChildCount() ||
855 (onlyIfVisible && !node.isVisible())) {
856 node = null;
857 }
858 else
859 node = (TreeStateNode)node.getChildAt
860 (childIndex);
861 }
862 return node;
863 }
864 paths.push(path);
865 path = path.getParentPath();
866 }
867 }
868 finally {
869 paths.removeAllElements();
870 tempStacks.push(paths);
871 }
872 // If we get here it means they share a different root!
873 // We could throw an exception...
874 }
875 return null;
876 }
877
878 /**
879 * Updates the y locations of all of the visible nodes after
880 * location.
881 */
882 private void updateYLocationsFrom(int location) {
883 if(location >= 0 && location < getRowCount()) {
884 int counter, maxCounter, newYOrigin;
885 TreeStateNode aNode;
886
887 aNode = getNode(location);
888 newYOrigin = aNode.getYOrigin() + aNode.getPreferredHeight();
889 for(counter = location + 1, maxCounter = visibleNodes.size();
890 counter < maxCounter;counter++) {
891 aNode = (TreeStateNode)visibleNodes.
892 elementAt(counter);
893 aNode.setYOrigin(newYOrigin);
894 newYOrigin += aNode.getPreferredHeight();
895 }
896 }
897 }
898
899 /**
900 * Resets the y origin of all the visible nodes as well as messaging
901 * all the visible nodes to updatePreferredSize(). You should not
902 * normally have to call this. Expanding and contracting the nodes
903 * automaticly adjusts the locations.
904 * updateAll determines if updatePreferredSize() is call on all nodes
905 * or just those that don't have a valid size.
906 */
907 private void updateNodeSizes(boolean updateAll) {
908 int aY, counter, maxCounter;
909 TreeStateNode node;
910
911 updateNodeSizes = false;
912 for(aY = counter = 0, maxCounter = visibleNodes.size();
913 counter < maxCounter; counter++) {
914 node = (TreeStateNode)visibleNodes.elementAt(counter);
915 node.setYOrigin(aY);
916 if(updateAll || !node.hasValidSize())
917 node.updatePreferredSize(counter);
918 aY += node.getPreferredHeight();
919 }
920 }
921
922 /**
923 * Returns the index of the row containing location. If there
924 * are no rows, -1 is returned. If location is beyond the last
925 * row index, the last row index is returned.
926 */
927 private int getRowContainingYLocation(int location) {
928 int max = getRowCount();
929
930 if(max <= 0)
931 return -1;
932 if(isFixedRowHeight()) {
933 return Math.max(0, Math.min(getRowCount() - 1,
934 location / getRowHeight()));
935 }
936
937 int min = 0, mid = 0;
938
939 while(min < max) {
940 mid = (max - min) / 2 + min;
941 TreeStateNode node = (TreeStateNode)visibleNodes.elementAt(mid);
942 int minY = node.getYOrigin();
943 int maxY = minY + node.getPreferredHeight();
944 if(location < minY) {
945 max = mid - 1;
946 }
947 else if(location >= maxY) {
948 min = mid + 1;
949 }
950 else
951 break;
952 }
953 if(min == max) {
954 mid = min;
955 if(mid >= getRowCount())
956 mid = getRowCount() - 1;
957 }
958 return mid;
959 }
960
961 /**
962 * Ensures that all the path components in path are expanded, accept
963 * for the last component which will only be expanded if expandLast
964 * is true.
965 * Returns true if succesful in finding the path.
966 */
967 private void ensurePathIsExpanded(TreePath aPath, boolean expandLast) {
968 if(aPath != null) {
969 // Make sure the last entry isn't a leaf.
970 if(treeModel.isLeaf(aPath.getLastPathComponent())) {
971 aPath = aPath.getParentPath();
972 expandLast = true;
973 }
974 if(aPath != null) {
975 TreeStateNode lastNode = getNodeForPath(aPath, false,
976 true);
977
978 if(lastNode != null) {
979 lastNode.makeVisible();
980 if(expandLast)
981 lastNode.expand();
982 }
983 }
984 }
985 }
986
987 /**
988 * Returns the AbstractTreeUI.VisibleNode displayed at the given row
989 */
990 private TreeStateNode getNode(int row) {
991 return (TreeStateNode)visibleNodes.elementAt(row);
992 }
993
994 /**
995 * Returns the maximum node width.
996 */
997 private int getMaxNodeWidth() {
998 int maxWidth = 0;
999 int nodeWidth;
1000 int counter;
1001 TreeStateNode node;
1002
1003 for(counter = getRowCount() - 1;counter >= 0;counter--) {
1004 node = this.getNode(counter);
1005 nodeWidth = node.getPreferredWidth() + node.getXOrigin();
1006 if(nodeWidth > maxWidth)
1007 maxWidth = nodeWidth;
1008 }
1009
1010 return maxWidth;
1011 }
1012 /**
1013 * Responsible for creating a TreeStateNode that will be used
1014 * to track display information about value.
1015 */
1016 private TreeStateNode createNodeForValue(Object value) {
1017 return new TreeStateNode(value);
1018 }
1019
1020
1021 /**
1022 * TreeStateNode is used to keep track of each of
1023 * the nodes that have been expanded. This will also cache the preferred
1024 * size of the value it represents.
1025 */
1026 private class TreeStateNode extends DefaultMutableTreeNode {
1027 /** Preferred size needed to draw the user object. */
1028 protected int preferredWidth;
1029 protected int preferredHeight;
1030
1031 /** X location that the user object will be drawn at. */
1032 protected int xOrigin;
1033
1034 /** Y location that the user object will be drawn at. */
1035 protected int yOrigin;
1036
1037 /** Is this node currently expanded? */
1038 protected boolean expanded;
1039
1040 /** Has this node been expanded at least once? */
1041 protected boolean hasBeenExpanded;
1042
1043 /** Path of this node. */
1044 protected TreePath path;
1045
1046
1047 public TreeStateNode(Object value) {
1048 super(value);
1049 }
1050
1051 //
1052 // Overriden DefaultMutableTreeNode methods
1053 //
1054
1055 /**
1056 * Messaged when this node is added somewhere, resets the path
1057 * and adds a mapping from path to this node.
1058 */
1059 public void setParent(MutableTreeNode parent) {
1060 super.setParent(parent);
1061 if(parent != null) {
1062 path = ((TreeStateNode)parent).getTreePath().
1063 pathByAddingChild(getUserObject());
1064 addMapping(this);
1065 }
1066 }
1067
1068 /**
1069 * Messaged when this node is removed from its parent, this messages
1070 * <code>removedFromMapping</code> to remove all the children.
1071 */
1072 public void remove(int childIndex) {
1073 TreeStateNode node = (TreeStateNode)getChildAt(childIndex);
1074
1075 node.removeFromMapping();
1076 super.remove(childIndex);
1077 }
1078
1079 /**
1080 * Messaged to set the user object. This resets the path.
1081 */
1082 public void setUserObject(Object o) {
1083 super.setUserObject(o);
1084 if(path != null) {
1085 TreeStateNode parent = (TreeStateNode)getParent();
1086
1087 if(parent != null)
1088 resetChildrenPaths(parent.getTreePath());
1089 else
1090 resetChildrenPaths(null);
1091 }
1092 }
1093
1094 /**
1095 * Returns the children of the receiver.
1096 * If the receiver is not currently expanded, this will return an
1097 * empty enumeration.
1098 */
1099 @Override
1100 public Enumeration<TreeNode> children() {
1101 if (!this.isExpanded()) {
1102 return DefaultMutableTreeNode.EMPTY_ENUMERATION;
1103 } else {
1104 return super.children();
1105 }
1106 }
1107
1108 /**
1109 * Returns true if the receiver is a leaf.
1110 */
1111 public boolean isLeaf() {
1112 return getModel().isLeaf(this.getValue());
1113 }
1114
1115 //
1116 // VariableHeightLayoutCache
1117 //
1118
1119 /**
1120 * Returns the location and size of this node.
1121 */
1122 public Rectangle getNodeBounds(Rectangle placeIn) {
1123 if(placeIn == null)
1124 placeIn = new Rectangle(getXOrigin(), getYOrigin(),
1125 getPreferredWidth(),
1126 getPreferredHeight());
1127 else {
1128 placeIn.x = getXOrigin();
1129 placeIn.y = getYOrigin();
1130 placeIn.width = getPreferredWidth();
1131 placeIn.height = getPreferredHeight();
1132 }
1133 return placeIn;
1134 }
1135
1136 /**
1137 * @return x location to draw node at.
1138 */
1139 public int getXOrigin() {
1140 if(!hasValidSize())
1141 updatePreferredSize(getRow());
1142 return xOrigin;
1143 }
1144
1145 /**
1146 * Returns the y origin the user object will be drawn at.
1147 */
1148 public int getYOrigin() {
1149 if(isFixedRowHeight()) {
1150 int aRow = getRow();
1151
1152 if(aRow == -1)
1153 return -1;
1154 return getRowHeight() * aRow;
1155 }
1156 return yOrigin;
1157 }
1158
1159 /**
1160 * Returns the preferred height of the receiver.
1161 */
1162 public int getPreferredHeight() {
1163 if(isFixedRowHeight())
1164 return getRowHeight();
1165 else if(!hasValidSize())
1166 updatePreferredSize(getRow());
1167 return preferredHeight;
1168 }
1169
1170 /**
1171 * Returns the preferred width of the receiver.
1172 */
1173 public int getPreferredWidth() {
1174 if(!hasValidSize())
1175 updatePreferredSize(getRow());
1176 return preferredWidth;
1177 }
1178
1179 /**
1180 * Returns true if this node has a valid size.
1181 */
1182 public boolean hasValidSize() {
1183 return (preferredHeight != 0);
1184 }
1185
1186 /**
1187 * Returns the row of the receiver.
1188 */
1189 public int getRow() {
1190 return visibleNodes.indexOf(this);
1191 }
1192
1193 /**
1194 * Returns true if this node has been expanded at least once.
1195 */
1196 public boolean hasBeenExpanded() {
1197 return hasBeenExpanded;
1198 }
1199
1200 /**
1201 * Returns true if the receiver has been expanded.
1202 */
1203 public boolean isExpanded() {
1204 return expanded;
1205 }
1206
1207 /**
1208 * Returns the last visible node that is a child of this
1209 * instance.
1210 */
1211 public TreeStateNode getLastVisibleNode() {
1212 TreeStateNode node = this;
1213
1214 while(node.isExpanded() && node.getChildCount() > 0)
1215 node = (TreeStateNode)node.getLastChild();
1216 return node;
1217 }
1218
1219 /**
1220 * Returns true if the receiver is currently visible.
1221 */
1222 public boolean isVisible() {
1223 if(this == root)
1224 return true;
1225
1226 TreeStateNode parent = (TreeStateNode)getParent();
1227
1228 return (parent != null && parent.isExpanded() &&
1229 parent.isVisible());
1230 }
1231
1232 /**
1233 * Returns the number of children this will have. If the children
1234 * have not yet been loaded, this messages the model.
1235 */
1236 public int getModelChildCount() {
1237 if(hasBeenExpanded)
1238 return super.getChildCount();
1239 return getModel().getChildCount(getValue());
1240 }
1241
1242 /**
1243 * Returns the number of visible children, that is the number of
1244 * children that are expanded, or leafs.
1245 */
1246 public int getVisibleChildCount() {
1247 int childCount = 0;
1248
1249 if(isExpanded()) {
1250 int maxCounter = getChildCount();
1251
1252 childCount += maxCounter;
1253 for(int counter = 0; counter < maxCounter; counter++)
1254 childCount += ((TreeStateNode)getChildAt(counter)).
1255 getVisibleChildCount();
1256 }
1257 return childCount;
1258 }
1259
1260 /**
1261 * Toggles the receiver between expanded and collapsed.
1262 */
1263 public void toggleExpanded() {
1264 if (isExpanded()) {
1265 collapse();
1266 } else {
1267 expand();
1268 }
1269 }
1270
1271 /**
1272 * Makes the receiver visible, but invoking
1273 * <code>expandParentAndReceiver</code> on the superclass.
1274 */
1275 public void makeVisible() {
1276 TreeStateNode parent = (TreeStateNode)getParent();
1277
1278 if(parent != null)
1279 parent.expandParentAndReceiver();
1280 }
1281
1282 /**
1283 * Expands the receiver.
1284 */
1285 public void expand() {
1286 expand(true);
1287 }
1288
1289 /**
1290 * Collapses the receiver.
1291 */
1292 public void collapse() {
1293 collapse(true);
1294 }
1295
1296 /**
1297 * Returns the value the receiver is representing. This is a cover
1298 * for getUserObject.
1299 */
1300 public Object getValue() {
1301 return getUserObject();
1302 }
1303
1304 /**
1305 * Returns a TreePath instance for this node.
1306 */
1307 public TreePath getTreePath() {
1308 return path;
1309 }
1310
1311 //
1312 // Local methods
1313 //
1314
1315 /**
1316 * Recreates the receivers path, and all its children's paths.
1317 */
1318 protected void resetChildrenPaths(TreePath parentPath) {
1319 removeMapping(this);
1320 if(parentPath == null)
1321 path = new TreePath(getUserObject());
1322 else
1323 path = parentPath.pathByAddingChild(getUserObject());
1324 addMapping(this);
1325 for(int counter = getChildCount() - 1; counter >= 0; counter--)
1326 ((TreeStateNode)getChildAt(counter)).resetChildrenPaths(path);
1327 }
1328
1329 /**
1330 * Sets y origin the user object will be drawn at to
1331 * <I>newYOrigin</I>.
1332 */
1333 protected void setYOrigin(int newYOrigin) {
1334 yOrigin = newYOrigin;
1335 }
1336
1337 /**
1338 * Shifts the y origin by <code>offset</code>.
1339 */
1340 protected void shiftYOriginBy(int offset) {
1341 yOrigin += offset;
1342 }
1343
1344 /**
1345 * Updates the receivers preferredSize by invoking
1346 * <code>updatePreferredSize</code> with an argument of -1.
1347 */
1348 protected void updatePreferredSize() {
1349 updatePreferredSize(getRow());
1350 }
1351
1352 /**
1353 * Updates the preferred size by asking the current renderer
1354 * for the Dimension needed to draw the user object this
1355 * instance represents.
1356 */
1357 protected void updatePreferredSize(int index) {
1358 Rectangle bounds = getNodeDimensions(this.getUserObject(),
1359 index, getLevel(),
1360 isExpanded(),
1361 boundsBuffer);
1362
1363 if(bounds == null || bounds.height == 0) {
1364 xOrigin = 0;
1365 preferredWidth = preferredHeight = 0;
1366 updateNodeSizes = true;
1367 } else {
1368 xOrigin = bounds.x;
1369 preferredWidth = bounds.width;
1370 if(isFixedRowHeight())
1371 preferredHeight = getRowHeight();
1372 else
1373 preferredHeight = bounds.height;
1374 }
1375 }
1376
1377 /**
1378 * Marks the receivers size as invalid. Next time the size, location
1379 * is asked for it will be obtained.
1380 */
1381 protected void markSizeInvalid() {
1382 preferredHeight = 0;
1383 }
1384
1385 /**
1386 * Marks the receivers size, and all its descendants sizes, as invalid.
1387 */
1388 protected void deepMarkSizeInvalid() {
1389 markSizeInvalid();
1390 for(int counter = getChildCount() - 1; counter >= 0; counter--)
1391 ((TreeStateNode)getChildAt(counter)).deepMarkSizeInvalid();
1392 }
1393
1394 /**
1395 * Returns the children of the receiver. If the children haven't
1396 * been loaded from the model and
1397 * <code>createIfNeeded</code> is true, the children are first
1398 * loaded.
1399 */
1400 protected Enumeration<TreeNode> getLoadedChildren(boolean createIfNeeded) {
1401 if(!createIfNeeded || hasBeenExpanded)
1402 return super.children();
1403
1404 TreeStateNode newNode;
1405 Object realNode = getValue();
1406 TreeModel treeModel = getModel();
1407 int count = treeModel.getChildCount(realNode);
1408
1409 hasBeenExpanded = true;
1410
1411 int childRow = getRow();
1412
1413 if(childRow == -1) {
1414 for (int i = 0; i < count; i++) {
1415 newNode = createNodeForValue
1416 (treeModel.getChild(realNode, i));
1417 this.add(newNode);
1418 newNode.updatePreferredSize(-1);
1419 }
1420 }
1421 else {
1422 childRow++;
1423 for (int i = 0; i < count; i++) {
1424 newNode = createNodeForValue
1425 (treeModel.getChild(realNode, i));
1426 this.add(newNode);
1427 newNode.updatePreferredSize(childRow++);
1428 }
1429 }
1430 return super.children();
1431 }
1432
1433 /**
1434 * Messaged from expand and collapse. This is meant for subclassers
1435 * that may wish to do something interesting with this.
1436 */
1437 protected void didAdjustTree() {
1438 }
1439
1440 /**
1441 * Invokes <code>expandParentAndReceiver</code> on the parent,
1442 * and expands the receiver.
1443 */
1444 protected void expandParentAndReceiver() {
1445 TreeStateNode parent = (TreeStateNode)getParent();
1446
1447 if(parent != null)
1448 parent.expandParentAndReceiver();
1449 expand();
1450 }
1451
1452 /**
1453 * Expands this node in the tree. This will load the children
1454 * from the treeModel if this node has not previously been
1455 * expanded. If <I>adjustTree</I> is true the tree and selection
1456 * are updated accordingly.
1457 */
1458 protected void expand(boolean adjustTree) {
1459 if (!isExpanded() && !isLeaf()) {
1460 boolean isFixed = isFixedRowHeight();
1461 int startHeight = getPreferredHeight();
1462 int originalRow = getRow();
1463
1464 expanded = true;
1465 updatePreferredSize(originalRow);
1466
1467 if (!hasBeenExpanded) {
1468 TreeStateNode newNode;
1469 Object realNode = getValue();
1470 TreeModel treeModel = getModel();
1471 int count = treeModel.getChildCount(realNode);
1472 int offset = originalRow == -1 ? -1 : originalRow + 1;
1473 hasBeenExpanded = true;
1474
1475 for (int i = 0; i < count; i++) {
1476 newNode = createNodeForValue(treeModel.getChild
1477 (realNode, i));
1478 this.add(newNode);
1479 newNode.updatePreferredSize(offset);
1480 }
1481 }
1482
1483 int i = originalRow;
1484 Enumeration<TreeNode> cursor = preorderEnumeration();
1485 cursor.nextElement(); // don't add me, I'm already in
1486
1487 int newYOrigin = isFixed || (this == root && !isRootVisible()) ?
1488 0 : getYOrigin() + this.getPreferredHeight();
1489
1490 TreeStateNode aNode;
1491 if(!isFixed) {
1492 while (cursor.hasMoreElements()) {
1493 aNode = (TreeStateNode) cursor.nextElement();
1494 if(!updateNodeSizes && !aNode.hasValidSize())
1495 aNode.updatePreferredSize(i + 1);
1496 aNode.setYOrigin(newYOrigin);
1497 newYOrigin += aNode.getPreferredHeight();
1498 visibleNodes.insertElementAt(aNode, ++i);
1499 }
1500 }
1501 else {
1502 while (cursor.hasMoreElements()) {
1503 aNode = (TreeStateNode) cursor.nextElement();
1504 visibleNodes.insertElementAt(aNode, ++i);
1505 }
1506 }
1507
1508 if(adjustTree && (originalRow != i ||
1509 getPreferredHeight() != startHeight)) {
1510 // Adjust the Y origin of any nodes following this row.
1511 if(!isFixed && ++i < getRowCount()) {
1512 int counter;
1513 int heightDiff = newYOrigin -
1514 (getYOrigin() + getPreferredHeight()) +
1515 (getPreferredHeight() - startHeight);
1516
1517 for(counter = visibleNodes.size() - 1;counter >= i;
1518 counter--)
1519 ((TreeStateNode)visibleNodes.elementAt(counter)).
1520 shiftYOriginBy(heightDiff);
1521 }
1522 didAdjustTree();
1523 visibleNodesChanged();
1524 }
1525
1526 // Update the rows in the selection
1527 if(treeSelectionModel != null) {
1528 treeSelectionModel.resetRowSelection();
1529 }
1530 }
1531 }
1532
1533 /**
1534 * Collapses this node in the tree. If <I>adjustTree</I> is
1535 * true the tree and selection are updated accordingly.
1536 */
1537 protected void collapse(boolean adjustTree) {
1538 if (isExpanded()) {
1539 Enumeration<TreeNode> cursor = preorderEnumeration();
1540 cursor.nextElement(); // don't remove me, I'm still visible
1541 int rowsDeleted = 0;
1542 boolean isFixed = isFixedRowHeight();
1543 int lastYEnd;
1544 if(isFixed)
1545 lastYEnd = 0;
1546 else
1547 lastYEnd = getPreferredHeight() + getYOrigin();
1548 int startHeight = getPreferredHeight();
1549 int startYEnd = lastYEnd;
1550 int myRow = getRow();
1551
1552 if(!isFixed) {
1553 while(cursor.hasMoreElements()) {
1554 TreeStateNode node = (TreeStateNode)cursor.
1555 nextElement();
1556 if (node.isVisible()) {
1557 rowsDeleted++;
1558 //visibleNodes.removeElement(node);
1559 lastYEnd = node.getYOrigin() +
1560 node.getPreferredHeight();
1561 }
1562 }
1563 }
1564 else {
1565 while(cursor.hasMoreElements()) {
1566 TreeStateNode node = (TreeStateNode)cursor.
1567 nextElement();
1568 if (node.isVisible()) {
1569 rowsDeleted++;
1570 //visibleNodes.removeElement(node);
1571 }
1572 }
1573 }
1574
1575 // Clean up the visible nodes.
1576 for (int counter = rowsDeleted + myRow; counter > myRow;
1577 counter--) {
1578 visibleNodes.removeElementAt(counter);
1579 }
1580
1581 expanded = false;
1582
1583 if(myRow == -1)
1584 markSizeInvalid();
1585 else if (adjustTree)
1586 updatePreferredSize(myRow);
1587
1588 if(myRow != -1 && adjustTree &&
1589 (rowsDeleted > 0 || startHeight != getPreferredHeight())) {
1590 // Adjust the Y origin of any rows following this one.
1591 startYEnd += (getPreferredHeight() - startHeight);
1592 if(!isFixed && (myRow + 1) < getRowCount() &&
1593 startYEnd != lastYEnd) {
1594 int counter, maxCounter, shiftAmount;
1595
1596 shiftAmount = startYEnd - lastYEnd;
1597 for(counter = myRow + 1, maxCounter =
1598 visibleNodes.size();
1599 counter < maxCounter;counter++)
1600 ((TreeStateNode)visibleNodes.elementAt(counter))
1601 .shiftYOriginBy(shiftAmount);
1602 }
1603 didAdjustTree();
1604 visibleNodesChanged();
1605 }
1606 if(treeSelectionModel != null && rowsDeleted > 0 &&
1607 myRow != -1) {
1608 treeSelectionModel.resetRowSelection();
1609 }
1610 }
1611 }
1612
1613 /**
1614 * Removes the receiver, and all its children, from the mapping
1615 * table.
1616 */
1617 protected void removeFromMapping() {
1618 if(path != null) {
1619 removeMapping(this);
1620 for(int counter = getChildCount() - 1; counter >= 0; counter--)
1621 ((TreeStateNode)getChildAt(counter)).removeFromMapping();
1622 }
1623 }
1624 } // End of VariableHeightLayoutCache.TreeStateNode
1625
1626
1627 /**
1628 * An enumerator to iterate through visible nodes.
1629 */
1630 private class VisibleTreeStateNodeEnumeration implements
1631 Enumeration<TreePath> {
1632 /** Parent thats children are being enumerated. */
1633 protected TreeStateNode parent;
1634 /** Index of next child. An index of -1 signifies parent should be
1635 * visibled next. */
1636 protected int nextIndex;
1637 /** Number of children in parent. */
1638 protected int childCount;
1639
1640 protected VisibleTreeStateNodeEnumeration(TreeStateNode node) {
1641 this(node, -1);
1642 }
1643
1644 protected VisibleTreeStateNodeEnumeration(TreeStateNode parent,
1645 int startIndex) {
1646 this.parent = parent;
1647 this.nextIndex = startIndex;
1648 this.childCount = this.parent.getChildCount();
1649 }
1650
1651 /**
1652 * @return true if more visible nodes.
1653 */
1654 public boolean hasMoreElements() {
1655 return (parent != null);
1656 }
1657
1658 /**
1659 * @return next visible TreePath.
1660 */
1661 public TreePath nextElement() {
1662 if(!hasMoreElements())
1663 throw new NoSuchElementException("No more visible paths");
1664
1665 TreePath retObject;
1666
1667 if(nextIndex == -1) {
1668 retObject = parent.getTreePath();
1669 }
1670 else {
1671 TreeStateNode node = (TreeStateNode)parent.
1672 getChildAt(nextIndex);
1673
1674 retObject = node.getTreePath();
1675 }
1676 updateNextObject();
1677 return retObject;
1678 }
1679
1680 /**
1681 * Determines the next object by invoking <code>updateNextIndex</code>
1682 * and if not succesful <code>findNextValidParent</code>.
1683 */
1684 protected void updateNextObject() {
1685 if(!updateNextIndex()) {
1686 findNextValidParent();
1687 }
1688 }
1689
1690 /**
1691 * Finds the next valid parent, this should be called when nextIndex
1692 * is beyond the number of children of the current parent.
1693 */
1694 protected boolean findNextValidParent() {
1695 if(parent == root) {
1696 // mark as invalid!
1697 parent = null;
1698 return false;
1699 }
1700 while(parent != null) {
1701 TreeStateNode newParent = (TreeStateNode)parent.
1702 getParent();
1703
1704 if(newParent != null) {
1705 nextIndex = newParent.getIndex(parent);
1706 parent = newParent;
1707 childCount = parent.getChildCount();
1708 if(updateNextIndex())
1709 return true;
1710 }
1711 else
1712 parent = null;
1713 }
1714 return false;
1715 }
1716
1717 /**
1718 * Updates <code>nextIndex</code> returning false if it is beyond
1719 * the number of children of parent.
1720 */
1721 protected boolean updateNextIndex() {
1722 // nextIndex == -1 identifies receiver, make sure is expanded
1723 // before descend.
1724 if((nextIndex == -1 && !parent.isExpanded()) ||
1725 childCount == 0 || // Check that it can have kids
1726 ++nextIndex >= childCount) // Make sure next index not beyond
1727 // child count.
1728 return false;
1729
1730 TreeStateNode child = (TreeStateNode)parent.
1731 getChildAt(nextIndex);
1732
1733 if(child != null && child.isExpanded()) {
1734 parent = child;
1735 nextIndex = -1;
1736 childCount = child.getChildCount();
1737 }
1738 return true;
1739 }
1740 } // VariableHeightLayoutCache.VisibleTreeStateNodeEnumeration
1741 }