1 /*
2 * Copyright (c) 1997, 2017, 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
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20 *
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23 * questions.
24 */
25 package javax.swing;
26
27 import java.awt.*;
28 import java.awt.event.*;
29
30 import java.util.Vector;
31 import java.util.Locale;
32 import java.util.ArrayList;
33 import java.util.Collections;
34 import java.util.List;
35
36 import java.beans.JavaBean;
37 import java.beans.BeanProperty;
38 import java.beans.PropertyChangeEvent;
39 import java.beans.PropertyChangeListener;
40 import java.beans.Transient;
41
42 import javax.swing.event.*;
43 import javax.accessibility.*;
44 import javax.swing.plaf.*;
45 import javax.swing.text.Position;
46
47 import java.io.ObjectOutputStream;
48 import java.io.IOException;
49 import java.io.Serializable;
50
51 import sun.awt.AWTAccessor;
52 import sun.awt.AWTAccessor.MouseEventAccessor;
53 import sun.swing.SwingUtilities2;
54 import sun.swing.SwingUtilities2.Section;
55 import static sun.swing.SwingUtilities2.Section.*;
56
57 /**
58 * A component that displays a list of objects and allows the user to select
59 * one or more items. A separate model, {@code ListModel}, maintains the
60 * contents of the list.
61 * <p>
62 * It's easy to display an array or Vector of objects, using the {@code JList}
63 * constructor that automatically builds a read-only {@code ListModel} instance
64 * for you:
65 * <pre>
66 * {@code
67 * // Create a JList that displays strings from an array
68 *
69 * String[] data = {"one", "two", "three", "four"};
70 * JList<String> myList = new JList<String>(data);
71 *
72 * // Create a JList that displays the superclasses of JList.class, by
73 * // creating it with a Vector populated with this data
74 *
75 * Vector<Class<?>> superClasses = new Vector<Class<?>>();
76 * Class<JList> rootClass = javax.swing.JList.class;
77 * for(Class<?> cls = rootClass; cls != null; cls = cls.getSuperclass()) {
78 * superClasses.addElement(cls);
79 * }
80 * JList<Class<?>> myList = new JList<Class<?>>(superClasses);
81 *
82 * // The automatically created model is stored in JList's "model"
83 * // property, which you can retrieve
84 *
85 * ListModel<Class<?>> model = myList.getModel();
86 * for(int i = 0; i < model.getSize(); i++) {
87 * System.out.println(model.getElementAt(i));
88 * }
89 * }
90 * </pre>
91 * <p>
92 * A {@code ListModel} can be supplied directly to a {@code JList} by way of a
93 * constructor or the {@code setModel} method. The contents need not be static -
94 * the number of items, and the values of items can change over time. A correct
95 * {@code ListModel} implementation notifies the set of
96 * {@code javax.swing.event.ListDataListener}s that have been added to it, each
97 * time a change occurs. These changes are characterized by a
98 * {@code javax.swing.event.ListDataEvent}, which identifies the range of list
99 * indices that have been modified, added, or removed. {@code JList}'s
100 * {@code ListUI} is responsible for keeping the visual representation up to
101 * date with changes, by listening to the model.
102 * <p>
103 * Simple, dynamic-content, {@code JList} applications can use the
104 * {@code DefaultListModel} class to maintain list elements. This class
105 * implements the {@code ListModel} interface and also provides a
106 * <code>java.util.Vector</code>-like API. Applications that need a more
107 * custom <code>ListModel</code> implementation may instead wish to subclass
108 * {@code AbstractListModel}, which provides basic support for managing and
109 * notifying listeners. For example, a read-only implementation of
110 * {@code AbstractListModel}:
111 * <pre>
112 * {@code
113 * // This list model has about 2^16 elements. Enjoy scrolling.
114 *
115 * ListModel<String> bigData = new AbstractListModel<String>() {
116 * public int getSize() { return Short.MAX_VALUE; }
117 * public String getElementAt(int index) { return "Index " + index; }
118 * };
119 * }
120 * </pre>
121 * <p>
122 * The selection state of a {@code JList} is managed by another separate
123 * model, an instance of {@code ListSelectionModel}. {@code JList} is
124 * initialized with a selection model on construction, and also contains
125 * methods to query or set this selection model. Additionally, {@code JList}
126 * provides convenient methods for easily managing the selection. These methods,
127 * such as {@code setSelectedIndex} and {@code getSelectedValue}, are cover
128 * methods that take care of the details of interacting with the selection
129 * model. By default, {@code JList}'s selection model is configured to allow any
130 * combination of items to be selected at a time; selection mode
131 * {@code MULTIPLE_INTERVAL_SELECTION}. The selection mode can be changed
132 * on the selection model directly, or via {@code JList}'s cover method.
133 * Responsibility for updating the selection model in response to user gestures
134 * lies with the list's {@code ListUI}.
135 * <p>
136 * A correct {@code ListSelectionModel} implementation notifies the set of
137 * {@code javax.swing.event.ListSelectionListener}s that have been added to it
138 * each time a change to the selection occurs. These changes are characterized
139 * by a {@code javax.swing.event.ListSelectionEvent}, which identifies the range
140 * of the selection change.
141 * <p>
142 * The preferred way to listen for changes in list selection is to add
143 * {@code ListSelectionListener}s directly to the {@code JList}. {@code JList}
144 * then takes care of listening to the selection model and notifying your
145 * listeners of change.
146 * <p>
147 * Responsibility for listening to selection changes in order to keep the list's
148 * visual representation up to date lies with the list's {@code ListUI}.
149 * <p>
150 * <a id="renderer"></a>
151 * Painting of cells in a {@code JList} is handled by a delegate called a
152 * cell renderer, installed on the list as the {@code cellRenderer} property.
153 * The renderer provides a {@code java.awt.Component} that is used
154 * like a "rubber stamp" to paint the cells. Each time a cell needs to be
155 * painted, the list's {@code ListUI} asks the cell renderer for the component,
156 * moves it into place, and has it paint the contents of the cell by way of its
157 * {@code paint} method. A default cell renderer, which uses a {@code JLabel}
158 * component to render, is installed by the lists's {@code ListUI}. You can
159 * substitute your own renderer using code like this:
160 * <pre>
161 * {@code
162 * // Display an icon and a string for each object in the list.
163 *
164 * class MyCellRenderer extends JLabel implements ListCellRenderer<Object> {
165 * static final ImageIcon longIcon = new ImageIcon("long.gif");
166 * static final ImageIcon shortIcon = new ImageIcon("short.gif");
167 *
168 * // This is the only method defined by ListCellRenderer.
169 * // We just reconfigure the JLabel each time we're called.
170 *
171 * public Component getListCellRendererComponent(
172 * JList<?> list, // the list
173 * Object value, // value to display
174 * int index, // cell index
175 * boolean isSelected, // is the cell selected
176 * boolean cellHasFocus) // does the cell have focus
177 * {
178 * String s = value.toString();
179 * setText(s);
180 * setIcon((s.length() > 10) ? longIcon : shortIcon);
181 * if (isSelected) {
182 * setBackground(list.getSelectionBackground());
183 * setForeground(list.getSelectionForeground());
184 * } else {
185 * setBackground(list.getBackground());
186 * setForeground(list.getForeground());
187 * }
188 * setEnabled(list.isEnabled());
189 * setFont(list.getFont());
190 * setOpaque(true);
191 * return this;
192 * }
193 * }
194 *
195 * myList.setCellRenderer(new MyCellRenderer());
196 * }
197 * </pre>
198 * <p>
199 * Another job for the cell renderer is in helping to determine sizing
200 * information for the list. By default, the list's {@code ListUI} determines
201 * the size of cells by asking the cell renderer for its preferred
202 * size for each list item. This can be expensive for large lists of items.
203 * To avoid these calculations, you can set a {@code fixedCellWidth} and
204 * {@code fixedCellHeight} on the list, or have these values calculated
205 * automatically based on a single prototype value:
206 * <a id="prototype_example"></a>
207 * <pre>
208 * {@code
209 * JList<String> bigDataList = new JList<String>(bigData);
210 *
211 * // We don't want the JList implementation to compute the width
212 * // or height of all of the list cells, so we give it a string
213 * // that's as big as we'll need for any cell. It uses this to
214 * // compute values for the fixedCellWidth and fixedCellHeight
215 * // properties.
216 *
217 * bigDataList.setPrototypeCellValue("Index 1234567890");
218 * }
219 * </pre>
220 * <p>
221 * {@code JList} doesn't implement scrolling directly. To create a list that
222 * scrolls, make it the viewport view of a {@code JScrollPane}. For example:
223 * <pre>
224 * JScrollPane scrollPane = new JScrollPane(myList);
225 *
226 * // Or in two steps:
227 * JScrollPane scrollPane = new JScrollPane();
228 * scrollPane.getViewport().setView(myList);
229 * </pre>
230 * <p>
231 * {@code JList} doesn't provide any special handling of double or triple
232 * (or N) mouse clicks, but it's easy to add a {@code MouseListener} if you
233 * wish to take action on these events. Use the {@code locationToIndex}
234 * method to determine what cell was clicked. For example:
235 * <pre>
236 * MouseListener mouseListener = new MouseAdapter() {
237 * public void mouseClicked(MouseEvent e) {
238 * if (e.getClickCount() == 2) {
239 * int index = list.locationToIndex(e.getPoint());
240 * System.out.println("Double clicked on Item " + index);
241 * }
242 * }
243 * };
244 * list.addMouseListener(mouseListener);
245 * </pre>
246 * <p>
247 * <strong>Warning:</strong> Swing is not thread safe. For more
248 * information see <a
249 * href="package-summary.html#threading">Swing's Threading
250 * Policy</a>.
251 * <p>
252 * <strong>Warning:</strong>
253 * Serialized objects of this class will not be compatible with
254 * future Swing releases. The current serialization support is
255 * appropriate for short term storage or RMI between applications running
256 * the same version of Swing. As of 1.4, support for long term storage
257 * of all JavaBeans™
258 * has been added to the <code>java.beans</code> package.
259 * Please see {@link java.beans.XMLEncoder}.
260 * <p>
261 * See <a href="http://docs.oracle.com/javase/tutorial/uiswing/components/list.html">How to Use Lists</a>
262 * in <a href="http://docs.oracle.com/javase/tutorial/"><em>The Java Tutorial</em></a>
263 * for further documentation.
264 *
265 * @see ListModel
266 * @see AbstractListModel
267 * @see DefaultListModel
268 * @see ListSelectionModel
269 * @see DefaultListSelectionModel
270 * @see ListCellRenderer
271 * @see DefaultListCellRenderer
272 *
273 * @param <E> the type of the elements of this list
274 *
275 * @author Hans Muller
276 * @since 1.2
277 */
278 @JavaBean(defaultProperty = "UI", description = "A component which allows for the selection of one or more objects from a list.")
279 @SwingContainer(false)
280 @SuppressWarnings("serial") // Same-version serialization only
281 public class JList<E> extends JComponent implements Scrollable, Accessible
282 {
283 /**
284 * @see #getUIClassID
285 * @see #readObject
286 */
287 private static final String uiClassID = "ListUI";
288
289 /**
290 * Indicates a vertical layout of cells, in a single column;
291 * the default layout.
292 * @see #setLayoutOrientation
293 * @since 1.4
294 */
295 public static final int VERTICAL = 0;
296
297 /**
298 * Indicates a "newspaper style" layout with cells flowing vertically
299 * then horizontally.
300 * @see #setLayoutOrientation
301 * @since 1.4
302 */
303 public static final int VERTICAL_WRAP = 1;
304
305 /**
306 * Indicates a "newspaper style" layout with cells flowing horizontally
307 * then vertically.
308 * @see #setLayoutOrientation
309 * @since 1.4
310 */
311 public static final int HORIZONTAL_WRAP = 2;
312
313 private int fixedCellWidth = -1;
314 private int fixedCellHeight = -1;
315 private int horizontalScrollIncrement = -1;
316 private E prototypeCellValue;
317 private int visibleRowCount = 8;
318 private Color selectionForeground;
319 private Color selectionBackground;
320 private boolean dragEnabled;
321
322 private ListSelectionModel selectionModel;
323 private ListModel<E> dataModel;
324 private ListCellRenderer<? super E> cellRenderer;
325 private ListSelectionListener selectionListener;
326
327 /**
328 * How to lay out the cells; defaults to <code>VERTICAL</code>.
329 */
330 private int layoutOrientation;
331
332 /**
333 * The drop mode for this component.
334 */
335 private DropMode dropMode = DropMode.USE_SELECTION;
336
337 /**
338 * The drop location.
339 */
340 private transient DropLocation dropLocation;
341
342 /**
343 * Flag to indicate UI update is in progress
344 */
345 private transient boolean updateInProgress;
346
347 /**
348 * A subclass of <code>TransferHandler.DropLocation</code> representing
349 * a drop location for a <code>JList</code>.
350 *
351 * @see #getDropLocation
352 * @since 1.6
353 */
354 public static final class DropLocation extends TransferHandler.DropLocation {
355 private final int index;
356 private final boolean isInsert;
357
358 private DropLocation(Point p, int index, boolean isInsert) {
359 super(p);
360 this.index = index;
361 this.isInsert = isInsert;
362 }
363
364 /**
365 * Returns the index where dropped data should be placed in the
366 * list. Interpretation of the value depends on the drop mode set on
367 * the associated component. If the drop mode is either
368 * <code>DropMode.USE_SELECTION</code> or <code>DropMode.ON</code>,
369 * the return value is an index of a row in the list. If the drop mode is
370 * <code>DropMode.INSERT</code>, the return value refers to the index
371 * where the data should be inserted. If the drop mode is
372 * <code>DropMode.ON_OR_INSERT</code>, the value of
373 * <code>isInsert()</code> indicates whether the index is an index
374 * of a row, or an insert index.
375 * <p>
376 * <code>-1</code> indicates that the drop occurred over empty space,
377 * and no index could be calculated.
378 *
379 * @return the drop index
380 */
381 public int getIndex() {
382 return index;
383 }
384
385 /**
386 * Returns whether or not this location represents an insert
387 * location.
388 *
389 * @return whether or not this is an insert location
390 */
391 public boolean isInsert() {
392 return isInsert;
393 }
394
395 /**
396 * Returns a string representation of this drop location.
397 * This method is intended to be used for debugging purposes,
398 * and the content and format of the returned string may vary
399 * between implementations.
400 *
401 * @return a string representation of this drop location
402 */
403 public String toString() {
404 return getClass().getName()
405 + "[dropPoint=" + getDropPoint() + ","
406 + "index=" + index + ","
407 + "insert=" + isInsert + "]";
408 }
409 }
410
411 /**
412 * Constructs a {@code JList} that displays elements from the specified,
413 * {@code non-null}, model. All {@code JList} constructors delegate to
414 * this one.
415 * <p>
416 * This constructor registers the list with the {@code ToolTipManager},
417 * allowing for tooltips to be provided by the cell renderers.
418 *
419 * @param dataModel the model for the list
420 * @exception IllegalArgumentException if the model is {@code null}
421 */
422 public JList(ListModel<E> dataModel)
423 {
424 if (dataModel == null) {
425 throw new IllegalArgumentException("dataModel must be non null");
426 }
427
428 // Register with the ToolTipManager so that tooltips from the
429 // renderer show through.
430 ToolTipManager toolTipManager = ToolTipManager.sharedInstance();
431 toolTipManager.registerComponent(this);
432
433 layoutOrientation = VERTICAL;
434
435 this.dataModel = dataModel;
436 selectionModel = createSelectionModel();
437 setAutoscrolls(true);
438 setOpaque(true);
439 updateUI();
440 }
441
442
443 /**
444 * Constructs a <code>JList</code> that displays the elements in
445 * the specified array. This constructor creates a read-only model
446 * for the given array, and then delegates to the constructor that
447 * takes a {@code ListModel}.
448 * <p>
449 * Attempts to pass a {@code null} value to this method results in
450 * undefined behavior and, most likely, exceptions. The created model
451 * references the given array directly. Attempts to modify the array
452 * after constructing the list results in undefined behavior.
453 *
454 * @param listData the array of Objects to be loaded into the data model,
455 * {@code non-null}
456 */
457 public JList(final E[] listData)
458 {
459 this (
460 new AbstractListModel<E>() {
461 public int getSize() { return listData.length; }
462 public E getElementAt(int i) { return listData[i]; }
463 }
464 );
465 }
466
467
468 /**
469 * Constructs a <code>JList</code> that displays the elements in
470 * the specified <code>Vector</code>. This constructor creates a read-only
471 * model for the given {@code Vector}, and then delegates to the constructor
472 * that takes a {@code ListModel}.
473 * <p>
474 * Attempts to pass a {@code null} value to this method results in
475 * undefined behavior and, most likely, exceptions. The created model
476 * references the given {@code Vector} directly. Attempts to modify the
477 * {@code Vector} after constructing the list results in undefined behavior.
478 *
479 * @param listData the <code>Vector</code> to be loaded into the
480 * data model, {@code non-null}
481 */
482 public JList(final Vector<? extends E> listData) {
483 this (
484 new AbstractListModel<E>() {
485 public int getSize() { return listData.size(); }
486 public E getElementAt(int i) { return listData.elementAt(i); }
487 }
488 );
489 }
490
491
492 /**
493 * Constructs a <code>JList</code> with an empty, read-only, model.
494 */
495 public JList() {
496 this (
497 new AbstractListModel<E>() {
498 public int getSize() { return 0; }
499 public E getElementAt(int i) { throw new IndexOutOfBoundsException("No Data Model"); }
500 }
501 );
502 }
503
504
505 /**
506 * Returns the {@code ListUI}, the look and feel object that
507 * renders this component.
508 *
509 * @return the <code>ListUI</code> object that renders this component
510 */
511 public ListUI getUI() {
512 return (ListUI)ui;
513 }
514
515
516 /**
517 * Sets the {@code ListUI}, the look and feel object that
518 * renders this component.
519 *
520 * @param ui the <code>ListUI</code> object
521 * @see UIDefaults#getUI
522 */
523 @BeanProperty(hidden = true, visualUpdate = true, description
524 = "The UI object that implements the Component's LookAndFeel.")
525 public void setUI(ListUI ui) {
526 super.setUI(ui);
527 }
528
529
530 /**
531 * Resets the {@code ListUI} property by setting it to the value provided
532 * by the current look and feel. If the current cell renderer was installed
533 * by the developer (rather than the look and feel itself), this also causes
534 * the cell renderer and its children to be updated, by calling
535 * {@code SwingUtilities.updateComponentTreeUI} on it.
536 *
537 * @see UIManager#getUI
538 * @see SwingUtilities#updateComponentTreeUI
539 */
540 public void updateUI() {
541 if (!updateInProgress) {
542 updateInProgress = true;
543 try {
544 setUI((ListUI)UIManager.getUI(this));
545
546 ListCellRenderer<? super E> renderer = getCellRenderer();
547 if (renderer instanceof Component) {
548 SwingUtilities.updateComponentTreeUI((Component)renderer);
549 }
550 } finally {
551 updateInProgress = false;
552 }
553 }
554 }
555
556
557 /**
558 * Returns {@code "ListUI"}, the <code>UIDefaults</code> key used to look
559 * up the name of the {@code javax.swing.plaf.ListUI} class that defines
560 * the look and feel for this component.
561 *
562 * @return the string "ListUI"
563 * @see JComponent#getUIClassID
564 * @see UIDefaults#getUI
565 */
566 @BeanProperty(bound = false)
567 public String getUIClassID() {
568 return uiClassID;
569 }
570
571
572 /* -----private-----
573 * This method is called by setPrototypeCellValue and setCellRenderer
574 * to update the fixedCellWidth and fixedCellHeight properties from the
575 * current value of prototypeCellValue (if it's non null).
576 * <p>
577 * This method sets fixedCellWidth and fixedCellHeight but does <b>not</b>
578 * generate PropertyChangeEvents for them.
579 *
580 * @see #setPrototypeCellValue
581 * @see #setCellRenderer
582 */
583 private void updateFixedCellSize()
584 {
585 ListCellRenderer<? super E> cr = getCellRenderer();
586 E value = getPrototypeCellValue();
587
588 if ((cr != null) && (value != null)) {
589 Component c = cr.getListCellRendererComponent(this, value, 0, false, false);
590
591 /* The ListUI implementation will add Component c to its private
592 * CellRendererPane however we can't assume that's already
593 * been done here. So we temporarily set the one "inherited"
594 * property that may affect the renderer components preferred size:
595 * its font.
596 */
597 Font f = c.getFont();
598 c.setFont(getFont());
599
600 Dimension d = c.getPreferredSize();
601 fixedCellWidth = d.width;
602 fixedCellHeight = d.height;
603
604 c.setFont(f);
605 }
606 }
607
608
609 /**
610 * Returns the "prototypical" cell value -- a value used to calculate a
611 * fixed width and height for cells. This can be {@code null} if there
612 * is no such value.
613 *
614 * @return the value of the {@code prototypeCellValue} property
615 * @see #setPrototypeCellValue
616 */
617 public E getPrototypeCellValue() {
618 return prototypeCellValue;
619 }
620
621 /**
622 * Sets the {@code prototypeCellValue} property, and then (if the new value
623 * is {@code non-null}), computes the {@code fixedCellWidth} and
624 * {@code fixedCellHeight} properties by requesting the cell renderer
625 * component for the given value (and index 0) from the cell renderer, and
626 * using that component's preferred size.
627 * <p>
628 * This method is useful when the list is too long to allow the
629 * {@code ListUI} to compute the width/height of each cell, and there is a
630 * single cell value that is known to occupy as much space as any of the
631 * others, a so-called prototype.
632 * <p>
633 * While all three of the {@code prototypeCellValue},
634 * {@code fixedCellHeight}, and {@code fixedCellWidth} properties may be
635 * modified by this method, {@code PropertyChangeEvent} notifications are
636 * only sent when the {@code prototypeCellValue} property changes.
637 * <p>
638 * To see an example which sets this property, see the
639 * <a href="#prototype_example">class description</a> above.
640 * <p>
641 * The default value of this property is <code>null</code>.
642 * <p>
643 * This is a JavaBeans bound property.
644 *
645 * @param prototypeCellValue the value on which to base
646 * <code>fixedCellWidth</code> and
647 * <code>fixedCellHeight</code>
648 * @see #getPrototypeCellValue
649 * @see #setFixedCellWidth
650 * @see #setFixedCellHeight
651 * @see JComponent#addPropertyChangeListener
652 */
653 @BeanProperty(visualUpdate = true, description
654 = "The cell prototype value, used to compute cell width and height.")
655 public void setPrototypeCellValue(E prototypeCellValue) {
656 E oldValue = this.prototypeCellValue;
657 this.prototypeCellValue = prototypeCellValue;
658
659 /* If the prototypeCellValue has changed and is non-null,
660 * then recompute fixedCellWidth and fixedCellHeight.
661 */
662
663 if ((prototypeCellValue != null) && !prototypeCellValue.equals(oldValue)) {
664 updateFixedCellSize();
665 }
666
667 firePropertyChange("prototypeCellValue", oldValue, prototypeCellValue);
668 }
669
670
671 /**
672 * Returns the value of the {@code fixedCellWidth} property.
673 *
674 * @return the fixed cell width
675 * @see #setFixedCellWidth
676 */
677 public int getFixedCellWidth() {
678 return fixedCellWidth;
679 }
680
681 /**
682 * Sets a fixed value to be used for the width of every cell in the list.
683 * If {@code width} is -1, cell widths are computed in the {@code ListUI}
684 * by applying <code>getPreferredSize</code> to the cell renderer component
685 * for each list element.
686 * <p>
687 * The default value of this property is {@code -1}.
688 * <p>
689 * This is a JavaBeans bound property.
690 *
691 * @param width the width to be used for all cells in the list
692 * @see #setPrototypeCellValue
693 * @see #setFixedCellWidth
694 * @see JComponent#addPropertyChangeListener
695 */
696 @BeanProperty(visualUpdate = true, description
697 = "Defines a fixed cell width when greater than zero.")
698 public void setFixedCellWidth(int width) {
699 int oldValue = fixedCellWidth;
700 fixedCellWidth = width;
701 firePropertyChange("fixedCellWidth", oldValue, fixedCellWidth);
702 }
703
704
705 /**
706 * Returns the value of the {@code fixedCellHeight} property.
707 *
708 * @return the fixed cell height
709 * @see #setFixedCellHeight
710 */
711 public int getFixedCellHeight() {
712 return fixedCellHeight;
713 }
714
715 /**
716 * Sets a fixed value to be used for the height of every cell in the list.
717 * If {@code height} is -1, cell heights are computed in the {@code ListUI}
718 * by applying <code>getPreferredSize</code> to the cell renderer component
719 * for each list element.
720 * <p>
721 * The default value of this property is {@code -1}.
722 * <p>
723 * This is a JavaBeans bound property.
724 *
725 * @param height the height to be used for all cells in the list
726 * @see #setPrototypeCellValue
727 * @see #setFixedCellWidth
728 * @see JComponent#addPropertyChangeListener
729 */
730 @BeanProperty(visualUpdate = true, description
731 = "Defines a fixed cell height when greater than zero.")
732 public void setFixedCellHeight(int height) {
733 int oldValue = fixedCellHeight;
734 fixedCellHeight = height;
735 firePropertyChange("fixedCellHeight", oldValue, fixedCellHeight);
736 }
737
738
739 /**
740 * Returns the object responsible for painting list items.
741 *
742 * @return the value of the {@code cellRenderer} property
743 * @see #setCellRenderer
744 */
745 @Transient
746 public ListCellRenderer<? super E> getCellRenderer() {
747 return cellRenderer;
748 }
749
750 /**
751 * Sets the delegate that is used to paint each cell in the list.
752 * The job of a cell renderer is discussed in detail in the
753 * <a href="#renderer">class level documentation</a>.
754 * <p>
755 * If the {@code prototypeCellValue} property is {@code non-null},
756 * setting the cell renderer also causes the {@code fixedCellWidth} and
757 * {@code fixedCellHeight} properties to be re-calculated. Only one
758 * <code>PropertyChangeEvent</code> is generated however -
759 * for the <code>cellRenderer</code> property.
760 * <p>
761 * The default value of this property is provided by the {@code ListUI}
762 * delegate, i.e. by the look and feel implementation.
763 * <p>
764 * This is a JavaBeans bound property.
765 *
766 * @param cellRenderer the <code>ListCellRenderer</code>
767 * that paints list cells
768 * @see #getCellRenderer
769 */
770 @BeanProperty(visualUpdate = true, description
771 = "The component used to draw the cells.")
772 public void setCellRenderer(ListCellRenderer<? super E> cellRenderer) {
773 ListCellRenderer<? super E> oldValue = this.cellRenderer;
774 this.cellRenderer = cellRenderer;
775
776 /* If the cellRenderer has changed and prototypeCellValue
777 * was set, then recompute fixedCellWidth and fixedCellHeight.
778 */
779 if ((cellRenderer != null) && !cellRenderer.equals(oldValue)) {
780 updateFixedCellSize();
781 }
782
783 firePropertyChange("cellRenderer", oldValue, cellRenderer);
784 }
785
786
787 /**
788 * Returns the color used to draw the foreground of selected items.
789 * {@code DefaultListCellRenderer} uses this color to draw the foreground
790 * of items in the selected state, as do the renderers installed by most
791 * {@code ListUI} implementations.
792 *
793 * @return the color to draw the foreground of selected items
794 * @see #setSelectionForeground
795 * @see DefaultListCellRenderer
796 */
797 public Color getSelectionForeground() {
798 return selectionForeground;
799 }
800
801
802 /**
803 * Sets the color used to draw the foreground of selected items, which
804 * cell renderers can use to render text and graphics.
805 * {@code DefaultListCellRenderer} uses this color to draw the foreground
806 * of items in the selected state, as do the renderers installed by most
807 * {@code ListUI} implementations.
808 * <p>
809 * The default value of this property is defined by the look and feel
810 * implementation.
811 * <p>
812 * This is a JavaBeans bound property.
813 *
814 * @param selectionForeground the {@code Color} to use in the foreground
815 * for selected list items
816 * @see #getSelectionForeground
817 * @see #setSelectionBackground
818 * @see #setForeground
819 * @see #setBackground
820 * @see #setFont
821 * @see DefaultListCellRenderer
822 */
823 @BeanProperty(visualUpdate = true, description
824 = "The foreground color of selected cells.")
825 public void setSelectionForeground(Color selectionForeground) {
826 Color oldValue = this.selectionForeground;
827 this.selectionForeground = selectionForeground;
828 firePropertyChange("selectionForeground", oldValue, selectionForeground);
829 }
830
831
832 /**
833 * Returns the color used to draw the background of selected items.
834 * {@code DefaultListCellRenderer} uses this color to draw the background
835 * of items in the selected state, as do the renderers installed by most
836 * {@code ListUI} implementations.
837 *
838 * @return the color to draw the background of selected items
839 * @see #setSelectionBackground
840 * @see DefaultListCellRenderer
841 */
842 public Color getSelectionBackground() {
843 return selectionBackground;
844 }
845
846
847 /**
848 * Sets the color used to draw the background of selected items, which
849 * cell renderers can use fill selected cells.
850 * {@code DefaultListCellRenderer} uses this color to fill the background
851 * of items in the selected state, as do the renderers installed by most
852 * {@code ListUI} implementations.
853 * <p>
854 * The default value of this property is defined by the look
855 * and feel implementation.
856 * <p>
857 * This is a JavaBeans bound property.
858 *
859 * @param selectionBackground the {@code Color} to use for the
860 * background of selected cells
861 * @see #getSelectionBackground
862 * @see #setSelectionForeground
863 * @see #setForeground
864 * @see #setBackground
865 * @see #setFont
866 * @see DefaultListCellRenderer
867 */
868 @BeanProperty(visualUpdate = true, description
869 = "The background color of selected cells.")
870 public void setSelectionBackground(Color selectionBackground) {
871 Color oldValue = this.selectionBackground;
872 this.selectionBackground = selectionBackground;
873 firePropertyChange("selectionBackground", oldValue, selectionBackground);
874 }
875
876
877 /**
878 * Returns the value of the {@code visibleRowCount} property. See the
879 * documentation for {@link #setVisibleRowCount} for details on how to
880 * interpret this value.
881 *
882 * @return the value of the {@code visibleRowCount} property.
883 * @see #setVisibleRowCount
884 */
885 public int getVisibleRowCount() {
886 return visibleRowCount;
887 }
888
889 /**
890 * Sets the {@code visibleRowCount} property, which has different meanings
891 * depending on the layout orientation: For a {@code VERTICAL} layout
892 * orientation, this sets the preferred number of rows to display without
893 * requiring scrolling; for other orientations, it affects the wrapping of
894 * cells.
895 * <p>
896 * In {@code VERTICAL} orientation:<br>
897 * Setting this property affects the return value of the
898 * {@link #getPreferredScrollableViewportSize} method, which is used to
899 * calculate the preferred size of an enclosing viewport. See that method's
900 * documentation for more details.
901 * <p>
902 * In {@code HORIZONTAL_WRAP} and {@code VERTICAL_WRAP} orientations:<br>
903 * This affects how cells are wrapped. See the documentation of
904 * {@link #setLayoutOrientation} for more details.
905 * <p>
906 * The default value of this property is {@code 8}.
907 * <p>
908 * Calling this method with a negative value results in the property
909 * being set to {@code 0}.
910 * <p>
911 * This is a JavaBeans bound property.
912 *
913 * @param visibleRowCount an integer specifying the preferred number of
914 * rows to display without requiring scrolling
915 * @see #getVisibleRowCount
916 * @see #getPreferredScrollableViewportSize
917 * @see #setLayoutOrientation
918 * @see JComponent#getVisibleRect
919 * @see JViewport
920 */
921 @BeanProperty(visualUpdate = true, description
922 = "The preferred number of rows to display without requiring scrolling")
923 public void setVisibleRowCount(int visibleRowCount) {
924 int oldValue = this.visibleRowCount;
925 this.visibleRowCount = Math.max(0, visibleRowCount);
926 firePropertyChange("visibleRowCount", oldValue, visibleRowCount);
927 }
928
929
930 /**
931 * Returns the layout orientation property for the list: {@code VERTICAL}
932 * if the layout is a single column of cells, {@code VERTICAL_WRAP} if the
933 * layout is "newspaper style" with the content flowing vertically then
934 * horizontally, or {@code HORIZONTAL_WRAP} if the layout is "newspaper
935 * style" with the content flowing horizontally then vertically.
936 *
937 * @return the value of the {@code layoutOrientation} property
938 * @see #setLayoutOrientation
939 * @since 1.4
940 */
941 public int getLayoutOrientation() {
942 return layoutOrientation;
943 }
944
945
946 /**
947 * Defines the way list cells are layed out. Consider a {@code JList}
948 * with five cells. Cells can be layed out in one of the following ways:
949 *
950 * <pre>
951 * VERTICAL: 0
952 * 1
953 * 2
954 * 3
955 * 4
956 *
957 * HORIZONTAL_WRAP: 0 1 2
958 * 3 4
959 *
960 * VERTICAL_WRAP: 0 3
961 * 1 4
962 * 2
963 * </pre>
964 * <p>
965 * A description of these layouts follows:
966 *
967 * <table class="striped">
968 * <caption>Describes layouts VERTICAL,HORIZONTAL_WRAP, and VERTICAL_WRAP
969 * </caption>
970 * <thead>
971 * <tr>
972 * <th scope="col">Value
973 * <th scope="col">Description
974 * </thead>
975 * <tbody>
976 * <tr>
977 * <th scope="row">{@code VERTICAL}
978 * <td>Cells are layed out vertically in a single column.
979 * <tr>
980 * <th scope="row">{@code HORIZONTAL_WRAP}
981 * <td>Cells are layed out horizontally, wrapping to a new row as
982 * necessary. If the {@code visibleRowCount} property is less than or
983 * equal to zero, wrapping is determined by the width of the list;
984 * otherwise wrapping is done in such a way as to ensure
985 * {@code visibleRowCount} rows in the list.
986 * <tr>
987 * <th scope="row">{@code VERTICAL_WRAP}
988 * <td>Cells are layed out vertically, wrapping to a new column as
989 * necessary. If the {@code visibleRowCount} property is less than or
990 * equal to zero, wrapping is determined by the height of the list;
991 * otherwise wrapping is done at {@code visibleRowCount} rows.
992 * </tbody>
993 * </table>
994 *
995 * The default value of this property is <code>VERTICAL</code>.
996 *
997 * @param layoutOrientation the new layout orientation, one of:
998 * {@code VERTICAL}, {@code HORIZONTAL_WRAP} or {@code VERTICAL_WRAP}
999 * @see #getLayoutOrientation
1000 * @see #setVisibleRowCount
1001 * @see #getScrollableTracksViewportHeight
1002 * @see #getScrollableTracksViewportWidth
1003 * @throws IllegalArgumentException if {@code layoutOrientation} isn't one of the
1004 * allowable values
1005 * @since 1.4
1006 */
1007 @BeanProperty(visualUpdate = true, enumerationValues = {
1008 "JList.VERTICAL",
1009 "JList.HORIZONTAL_WRAP",
1010 "JList.VERTICAL_WRAP"}, description
1011 = "Defines the way list cells are layed out.")
1012 public void setLayoutOrientation(int layoutOrientation) {
1013 int oldValue = this.layoutOrientation;
1014 switch (layoutOrientation) {
1015 case VERTICAL:
1016 case VERTICAL_WRAP:
1017 case HORIZONTAL_WRAP:
1018 this.layoutOrientation = layoutOrientation;
1019 firePropertyChange("layoutOrientation", oldValue, layoutOrientation);
1020 break;
1021 default:
1022 throw new IllegalArgumentException("layoutOrientation must be one of: VERTICAL, HORIZONTAL_WRAP or VERTICAL_WRAP");
1023 }
1024 }
1025
1026
1027 /**
1028 * Returns the smallest list index that is currently visible.
1029 * In a left-to-right {@code componentOrientation}, the first visible
1030 * cell is found closest to the list's upper-left corner. In right-to-left
1031 * orientation, it is found closest to the upper-right corner.
1032 * If nothing is visible or the list is empty, {@code -1} is returned.
1033 * Note that the returned cell may only be partially visible.
1034 *
1035 * @return the index of the first visible cell
1036 * @see #getLastVisibleIndex
1037 * @see JComponent#getVisibleRect
1038 */
1039 @BeanProperty(bound = false)
1040 public int getFirstVisibleIndex() {
1041 Rectangle r = getVisibleRect();
1042 int first;
1043 if (this.getComponentOrientation().isLeftToRight()) {
1044 first = locationToIndex(r.getLocation());
1045 } else {
1046 first = locationToIndex(new Point((r.x + r.width) - 1, r.y));
1047 }
1048 if (first != -1) {
1049 Rectangle bounds = getCellBounds(first, first);
1050 if (bounds != null) {
1051 SwingUtilities.computeIntersection(r.x, r.y, r.width, r.height, bounds);
1052 if (bounds.width == 0 || bounds.height == 0) {
1053 first = -1;
1054 }
1055 }
1056 }
1057 return first;
1058 }
1059
1060
1061 /**
1062 * Returns the largest list index that is currently visible.
1063 * If nothing is visible or the list is empty, {@code -1} is returned.
1064 * Note that the returned cell may only be partially visible.
1065 *
1066 * @return the index of the last visible cell
1067 * @see #getFirstVisibleIndex
1068 * @see JComponent#getVisibleRect
1069 */
1070 @BeanProperty(bound = false)
1071 public int getLastVisibleIndex() {
1072 boolean leftToRight = this.getComponentOrientation().isLeftToRight();
1073 Rectangle r = getVisibleRect();
1074 Point lastPoint;
1075 if (leftToRight) {
1076 lastPoint = new Point((r.x + r.width) - 1, (r.y + r.height) - 1);
1077 } else {
1078 lastPoint = new Point(r.x, (r.y + r.height) - 1);
1079 }
1080 int location = locationToIndex(lastPoint);
1081
1082 if (location != -1) {
1083 Rectangle bounds = getCellBounds(location, location);
1084
1085 if (bounds != null) {
1086 SwingUtilities.computeIntersection(r.x, r.y, r.width, r.height, bounds);
1087 if (bounds.width == 0 || bounds.height == 0) {
1088 // Try the top left(LTR) or top right(RTL) corner, and
1089 // then go across checking each cell for HORIZONTAL_WRAP.
1090 // Try the lower left corner, and then go across checking
1091 // each cell for other list layout orientation.
1092 boolean isHorizontalWrap =
1093 (getLayoutOrientation() == HORIZONTAL_WRAP);
1094 Point visibleLocation = isHorizontalWrap ?
1095 new Point(lastPoint.x, r.y) :
1096 new Point(r.x, lastPoint.y);
1097 int last;
1098 int visIndex = -1;
1099 int lIndex = location;
1100 location = -1;
1101
1102 do {
1103 last = visIndex;
1104 visIndex = locationToIndex(visibleLocation);
1105
1106 if (visIndex != -1) {
1107 bounds = getCellBounds(visIndex, visIndex);
1108 if (visIndex != lIndex && bounds != null &&
1109 bounds.contains(visibleLocation)) {
1110 location = visIndex;
1111 if (isHorizontalWrap) {
1112 visibleLocation.y = bounds.y + bounds.height;
1113 if (visibleLocation.y >= lastPoint.y) {
1114 // Past visible region, bail.
1115 last = visIndex;
1116 }
1117 }
1118 else {
1119 visibleLocation.x = bounds.x + bounds.width;
1120 if (visibleLocation.x >= lastPoint.x) {
1121 // Past visible region, bail.
1122 last = visIndex;
1123 }
1124 }
1125
1126 }
1127 else {
1128 last = visIndex;
1129 }
1130 }
1131 } while (visIndex != -1 && last != visIndex);
1132 }
1133 }
1134 }
1135 return location;
1136 }
1137
1138
1139 /**
1140 * Scrolls the list within an enclosing viewport to make the specified
1141 * cell completely visible. This calls {@code scrollRectToVisible} with
1142 * the bounds of the specified cell. For this method to work, the
1143 * {@code JList} must be within a <code>JViewport</code>.
1144 * <p>
1145 * If the given index is outside the list's range of cells, this method
1146 * results in nothing.
1147 *
1148 * @param index the index of the cell to make visible
1149 * @see JComponent#scrollRectToVisible
1150 * @see #getVisibleRect
1151 */
1152 public void ensureIndexIsVisible(int index) {
1153 Rectangle cellBounds = getCellBounds(index, index);
1154 if (cellBounds != null) {
1155 scrollRectToVisible(cellBounds);
1156 }
1157 }
1158
1159 /**
1160 * Turns on or off automatic drag handling. In order to enable automatic
1161 * drag handling, this property should be set to {@code true}, and the
1162 * list's {@code TransferHandler} needs to be {@code non-null}.
1163 * The default value of the {@code dragEnabled} property is {@code false}.
1164 * <p>
1165 * The job of honoring this property, and recognizing a user drag gesture,
1166 * lies with the look and feel implementation, and in particular, the list's
1167 * {@code ListUI}. When automatic drag handling is enabled, most look and
1168 * feels (including those that subclass {@code BasicLookAndFeel}) begin a
1169 * drag and drop operation whenever the user presses the mouse button over
1170 * an item and then moves the mouse a few pixels. Setting this property to
1171 * {@code true} can therefore have a subtle effect on how selections behave.
1172 * <p>
1173 * If a look and feel is used that ignores this property, you can still
1174 * begin a drag and drop operation by calling {@code exportAsDrag} on the
1175 * list's {@code TransferHandler}.
1176 *
1177 * @param b whether or not to enable automatic drag handling
1178 * @exception HeadlessException if
1179 * <code>b</code> is <code>true</code> and
1180 * <code>GraphicsEnvironment.isHeadless()</code>
1181 * returns <code>true</code>
1182 * @see java.awt.GraphicsEnvironment#isHeadless
1183 * @see #getDragEnabled
1184 * @see #setTransferHandler
1185 * @see TransferHandler
1186 * @since 1.4
1187 */
1188 @BeanProperty(bound = false, description
1189 = "determines whether automatic drag handling is enabled")
1190 public void setDragEnabled(boolean b) {
1191 if (b && GraphicsEnvironment.isHeadless()) {
1192 throw new HeadlessException();
1193 }
1194 dragEnabled = b;
1195 }
1196
1197 /**
1198 * Returns whether or not automatic drag handling is enabled.
1199 *
1200 * @return the value of the {@code dragEnabled} property
1201 * @see #setDragEnabled
1202 * @since 1.4
1203 */
1204 public boolean getDragEnabled() {
1205 return dragEnabled;
1206 }
1207
1208 /**
1209 * Sets the drop mode for this component. For backward compatibility,
1210 * the default for this property is <code>DropMode.USE_SELECTION</code>.
1211 * Usage of one of the other modes is recommended, however, for an
1212 * improved user experience. <code>DropMode.ON</code>, for instance,
1213 * offers similar behavior of showing items as selected, but does so without
1214 * affecting the actual selection in the list.
1215 * <p>
1216 * <code>JList</code> supports the following drop modes:
1217 * <ul>
1218 * <li><code>DropMode.USE_SELECTION</code></li>
1219 * <li><code>DropMode.ON</code></li>
1220 * <li><code>DropMode.INSERT</code></li>
1221 * <li><code>DropMode.ON_OR_INSERT</code></li>
1222 * </ul>
1223 * The drop mode is only meaningful if this component has a
1224 * <code>TransferHandler</code> that accepts drops.
1225 *
1226 * @param dropMode the drop mode to use
1227 * @throws IllegalArgumentException if the drop mode is unsupported
1228 * or <code>null</code>
1229 * @see #getDropMode
1230 * @see #getDropLocation
1231 * @see #setTransferHandler
1232 * @see TransferHandler
1233 * @since 1.6
1234 */
1235 public final void setDropMode(DropMode dropMode) {
1236 if (dropMode != null) {
1237 switch (dropMode) {
1238 case USE_SELECTION:
1239 case ON:
1240 case INSERT:
1241 case ON_OR_INSERT:
1242 this.dropMode = dropMode;
1243 return;
1244 }
1245 }
1246
1247 throw new IllegalArgumentException(dropMode + ": Unsupported drop mode for list");
1248 }
1249
1250 /**
1251 * Returns the drop mode for this component.
1252 *
1253 * @return the drop mode for this component
1254 * @see #setDropMode
1255 * @since 1.6
1256 */
1257 public final DropMode getDropMode() {
1258 return dropMode;
1259 }
1260
1261 /**
1262 * Calculates a drop location in this component, representing where a
1263 * drop at the given point should insert data.
1264 *
1265 * @param p the point to calculate a drop location for
1266 * @return the drop location, or <code>null</code>
1267 */
1268 DropLocation dropLocationForPoint(Point p) {
1269 DropLocation location = null;
1270 Rectangle rect = null;
1271
1272 int index = locationToIndex(p);
1273 if (index != -1) {
1274 rect = getCellBounds(index, index);
1275 }
1276
1277 switch(dropMode) {
1278 case USE_SELECTION:
1279 case ON:
1280 location = new DropLocation(p,
1281 (rect != null && rect.contains(p)) ? index : -1,
1282 false);
1283
1284 break;
1285 case INSERT:
1286 if (index == -1) {
1287 location = new DropLocation(p, getModel().getSize(), true);
1288 break;
1289 }
1290
1291 if (layoutOrientation == HORIZONTAL_WRAP) {
1292 boolean ltr = getComponentOrientation().isLeftToRight();
1293
1294 if (SwingUtilities2.liesInHorizontal(rect, p, ltr, false) == TRAILING) {
1295 index++;
1296 // special case for below all cells
1297 } else if (index == getModel().getSize() - 1 && p.y >= rect.y + rect.height) {
1298 index++;
1299 }
1300 } else {
1301 if (SwingUtilities2.liesInVertical(rect, p, false) == TRAILING) {
1302 index++;
1303 }
1304 }
1305
1306 location = new DropLocation(p, index, true);
1307
1308 break;
1309 case ON_OR_INSERT:
1310 if (index == -1) {
1311 location = new DropLocation(p, getModel().getSize(), true);
1312 break;
1313 }
1314
1315 boolean between = false;
1316
1317 if (layoutOrientation == HORIZONTAL_WRAP) {
1318 boolean ltr = getComponentOrientation().isLeftToRight();
1319
1320 Section section = SwingUtilities2.liesInHorizontal(rect, p, ltr, true);
1321 if (section == TRAILING) {
1322 index++;
1323 between = true;
1324 // special case for below all cells
1325 } else if (index == getModel().getSize() - 1 && p.y >= rect.y + rect.height) {
1326 index++;
1327 between = true;
1328 } else if (section == LEADING) {
1329 between = true;
1330 }
1331 } else {
1332 Section section = SwingUtilities2.liesInVertical(rect, p, true);
1333 if (section == LEADING) {
1334 between = true;
1335 } else if (section == TRAILING) {
1336 index++;
1337 between = true;
1338 }
1339 }
1340
1341 location = new DropLocation(p, index, between);
1342
1343 break;
1344 default:
1345 assert false : "Unexpected drop mode";
1346 }
1347
1348 return location;
1349 }
1350
1351 /**
1352 * Called to set or clear the drop location during a DnD operation.
1353 * In some cases, the component may need to use it's internal selection
1354 * temporarily to indicate the drop location. To help facilitate this,
1355 * this method returns and accepts as a parameter a state object.
1356 * This state object can be used to store, and later restore, the selection
1357 * state. Whatever this method returns will be passed back to it in
1358 * future calls, as the state parameter. If it wants the DnD system to
1359 * continue storing the same state, it must pass it back every time.
1360 * Here's how this is used:
1361 * <p>
1362 * Let's say that on the first call to this method the component decides
1363 * to save some state (because it is about to use the selection to show
1364 * a drop index). It can return a state object to the caller encapsulating
1365 * any saved selection state. On a second call, let's say the drop location
1366 * is being changed to something else. The component doesn't need to
1367 * restore anything yet, so it simply passes back the same state object
1368 * to have the DnD system continue storing it. Finally, let's say this
1369 * method is messaged with <code>null</code>. This means DnD
1370 * is finished with this component for now, meaning it should restore
1371 * state. At this point, it can use the state parameter to restore
1372 * said state, and of course return <code>null</code> since there's
1373 * no longer anything to store.
1374 *
1375 * @param location the drop location (as calculated by
1376 * <code>dropLocationForPoint</code>) or <code>null</code>
1377 * if there's no longer a valid drop location
1378 * @param state the state object saved earlier for this component,
1379 * or <code>null</code>
1380 * @param forDrop whether or not the method is being called because an
1381 * actual drop occurred
1382 * @return any saved state for this component, or <code>null</code> if none
1383 */
1384 Object setDropLocation(TransferHandler.DropLocation location,
1385 Object state,
1386 boolean forDrop) {
1387
1388 Object retVal = null;
1389 DropLocation listLocation = (DropLocation)location;
1390
1391 if (dropMode == DropMode.USE_SELECTION) {
1392 if (listLocation == null) {
1393 if (!forDrop && state != null) {
1394 setSelectedIndices(((int[][])state)[0]);
1395
1396 int anchor = ((int[][])state)[1][0];
1397 int lead = ((int[][])state)[1][1];
1398
1399 SwingUtilities2.setLeadAnchorWithoutSelection(
1400 getSelectionModel(), lead, anchor);
1401 }
1402 } else {
1403 if (dropLocation == null) {
1404 int[] inds = getSelectedIndices();
1405 retVal = new int[][] {inds, {getAnchorSelectionIndex(),
1406 getLeadSelectionIndex()}};
1407 } else {
1408 retVal = state;
1409 }
1410
1411 int index = listLocation.getIndex();
1412 if (index == -1) {
1413 clearSelection();
1414 getSelectionModel().setAnchorSelectionIndex(-1);
1415 getSelectionModel().setLeadSelectionIndex(-1);
1416 } else {
1417 setSelectionInterval(index, index);
1418 }
1419 }
1420 }
1421
1422 DropLocation old = dropLocation;
1423 dropLocation = listLocation;
1424 firePropertyChange("dropLocation", old, dropLocation);
1425
1426 return retVal;
1427 }
1428
1429 /**
1430 * Returns the location that this component should visually indicate
1431 * as the drop location during a DnD operation over the component,
1432 * or {@code null} if no location is to currently be shown.
1433 * <p>
1434 * This method is not meant for querying the drop location
1435 * from a {@code TransferHandler}, as the drop location is only
1436 * set after the {@code TransferHandler}'s <code>canImport</code>
1437 * has returned and has allowed for the location to be shown.
1438 * <p>
1439 * When this property changes, a property change event with
1440 * name "dropLocation" is fired by the component.
1441 * <p>
1442 * By default, responsibility for listening for changes to this property
1443 * and indicating the drop location visually lies with the list's
1444 * {@code ListUI}, which may paint it directly and/or install a cell
1445 * renderer to do so. Developers wishing to implement custom drop location
1446 * painting and/or replace the default cell renderer, may need to honor
1447 * this property.
1448 *
1449 * @return the drop location
1450 * @see #setDropMode
1451 * @see TransferHandler#canImport(TransferHandler.TransferSupport)
1452 * @since 1.6
1453 */
1454 @BeanProperty(bound = false)
1455 public final DropLocation getDropLocation() {
1456 return dropLocation;
1457 }
1458
1459 /**
1460 * Returns the next list element whose {@code toString} value
1461 * starts with the given prefix.
1462 *
1463 * @param prefix the string to test for a match
1464 * @param startIndex the index for starting the search
1465 * @param bias the search direction, either
1466 * Position.Bias.Forward or Position.Bias.Backward.
1467 * @return the index of the next list element that
1468 * starts with the prefix; otherwise {@code -1}
1469 * @exception IllegalArgumentException if prefix is {@code null}
1470 * or startIndex is out of bounds
1471 * @since 1.4
1472 */
1473 public int getNextMatch(String prefix, int startIndex, Position.Bias bias) {
1474 ListModel<E> model = getModel();
1475 int max = model.getSize();
1476 if (prefix == null) {
1477 throw new IllegalArgumentException();
1478 }
1479 if (startIndex < 0 || startIndex >= max) {
1480 throw new IllegalArgumentException();
1481 }
1482 prefix = prefix.toUpperCase();
1483
1484 // start search from the next element after the selected element
1485 int increment = (bias == Position.Bias.Forward) ? 1 : -1;
1486 int index = startIndex;
1487 do {
1488 E element = model.getElementAt(index);
1489
1490 if (element != null) {
1491 String string;
1492
1493 if (element instanceof String) {
1494 string = ((String)element).toUpperCase();
1495 }
1496 else {
1497 string = element.toString();
1498 if (string != null) {
1499 string = string.toUpperCase();
1500 }
1501 }
1502
1503 if (string != null && string.startsWith(prefix)) {
1504 return index;
1505 }
1506 }
1507 index = (index + increment + max) % max;
1508 } while (index != startIndex);
1509 return -1;
1510 }
1511
1512 /**
1513 * Returns the tooltip text to be used for the given event. This overrides
1514 * {@code JComponent}'s {@code getToolTipText} to first check the cell
1515 * renderer component for the cell over which the event occurred, returning
1516 * its tooltip text, if any. This implementation allows you to specify
1517 * tooltip text on the cell level, by using {@code setToolTipText} on your
1518 * cell renderer component.
1519 * <p>
1520 * <strong>Note:</strong> For <code>JList</code> to properly display the
1521 * tooltips of its renderers in this manner, <code>JList</code> must be a
1522 * registered component with the <code>ToolTipManager</code>. This registration
1523 * is done automatically in the constructor. However, if at a later point
1524 * <code>JList</code> is unregistered, by way of a call to
1525 * {@code setToolTipText(null)}, tips from the renderers will no longer display.
1526 *
1527 * @param event the {@code MouseEvent} to fetch the tooltip text for
1528 * @see JComponent#setToolTipText
1529 * @see JComponent#getToolTipText
1530 */
1531 @SuppressWarnings("deprecation")
1532 public String getToolTipText(MouseEvent event) {
1533 if(event != null) {
1534 Point p = event.getPoint();
1535 int index = locationToIndex(p);
1536 ListCellRenderer<? super E> r = getCellRenderer();
1537 Rectangle cellBounds;
1538
1539 if (index != -1 && r != null && (cellBounds =
1540 getCellBounds(index, index)) != null &&
1541 cellBounds.contains(p.x, p.y)) {
1542 ListSelectionModel lsm = getSelectionModel();
1543 Component rComponent = r.getListCellRendererComponent(
1544 this, getModel().getElementAt(index), index,
1545 lsm.isSelectedIndex(index),
1546 (hasFocus() && (lsm.getLeadSelectionIndex() ==
1547 index)));
1548
1549 if(rComponent instanceof JComponent) {
1550 MouseEvent newEvent;
1551
1552 p.translate(-cellBounds.x, -cellBounds.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 MouseEventAccessor meAccessor =
1563 AWTAccessor.getMouseEventAccessor();
1564 meAccessor.setCausedByTouchEvent(newEvent,
1565 meAccessor.isCausedByTouchEvent(event));
1566
1567 String tip = ((JComponent)rComponent).getToolTipText(
1568 newEvent);
1569
1570 if (tip != null) {
1571 return tip;
1572 }
1573 }
1574 }
1575 }
1576 return super.getToolTipText();
1577 }
1578
1579 /**
1580 * --- ListUI Delegations ---
1581 */
1582
1583
1584 /**
1585 * Returns the cell index closest to the given location in the list's
1586 * coordinate system. To determine if the cell actually contains the
1587 * specified location, compare the point against the cell's bounds,
1588 * as provided by {@code getCellBounds}. This method returns {@code -1}
1589 * if the model is empty
1590 * <p>
1591 * This is a cover method that delegates to the method of the same name
1592 * in the list's {@code ListUI}. It returns {@code -1} if the list has
1593 * no {@code ListUI}.
1594 *
1595 * @param location the coordinates of the point
1596 * @return the cell index closest to the given location, or {@code -1}
1597 */
1598 public int locationToIndex(Point location) {
1599 ListUI ui = getUI();
1600 return (ui != null) ? ui.locationToIndex(this, location) : -1;
1601 }
1602
1603
1604 /**
1605 * Returns the origin of the specified item in the list's coordinate
1606 * system. This method returns {@code null} if the index isn't valid.
1607 * <p>
1608 * This is a cover method that delegates to the method of the same name
1609 * in the list's {@code ListUI}. It returns {@code null} if the list has
1610 * no {@code ListUI}.
1611 *
1612 * @param index the cell index
1613 * @return the origin of the cell, or {@code null}
1614 */
1615 public Point indexToLocation(int index) {
1616 ListUI ui = getUI();
1617 return (ui != null) ? ui.indexToLocation(this, index) : null;
1618 }
1619
1620
1621 /**
1622 * Returns the bounding rectangle, in the list's coordinate system,
1623 * for the range of cells specified by the two indices.
1624 * These indices can be supplied in any order.
1625 * <p>
1626 * If the smaller index is outside the list's range of cells, this method
1627 * returns {@code null}. If the smaller index is valid, but the larger
1628 * index is outside the list's range, the bounds of just the first index
1629 * is returned. Otherwise, the bounds of the valid range is returned.
1630 * <p>
1631 * This is a cover method that delegates to the method of the same name
1632 * in the list's {@code ListUI}. It returns {@code null} if the list has
1633 * no {@code ListUI}.
1634 *
1635 * @param index0 the first index in the range
1636 * @param index1 the second index in the range
1637 * @return the bounding rectangle for the range of cells, or {@code null}
1638 */
1639 public Rectangle getCellBounds(int index0, int index1) {
1640 ListUI ui = getUI();
1641 return (ui != null) ? ui.getCellBounds(this, index0, index1) : null;
1642 }
1643
1644
1645 /**
1646 * --- ListModel Support ---
1647 */
1648
1649
1650 /**
1651 * Returns the data model that holds the list of items displayed
1652 * by the <code>JList</code> component.
1653 *
1654 * @return the <code>ListModel</code> that provides the displayed
1655 * list of items
1656 * @see #setModel
1657 */
1658 public ListModel<E> getModel() {
1659 return dataModel;
1660 }
1661
1662 /**
1663 * Sets the model that represents the contents or "value" of the
1664 * list, notifies property change listeners, and then clears the
1665 * list's selection.
1666 * <p>
1667 * This is a JavaBeans bound property.
1668 *
1669 * @param model the <code>ListModel</code> that provides the
1670 * list of items for display
1671 * @exception IllegalArgumentException if <code>model</code> is
1672 * <code>null</code>
1673 * @see #getModel
1674 * @see #clearSelection
1675 */
1676 @BeanProperty(visualUpdate = true, description
1677 = "The object that contains the data to be drawn by this JList.")
1678 public void setModel(ListModel<E> model) {
1679 if (model == null) {
1680 throw new IllegalArgumentException("model must be non null");
1681 }
1682 ListModel<E> oldValue = dataModel;
1683 dataModel = model;
1684 firePropertyChange("model", oldValue, dataModel);
1685 clearSelection();
1686 }
1687
1688
1689 /**
1690 * Constructs a read-only <code>ListModel</code> from an array of items,
1691 * and calls {@code setModel} with this model.
1692 * <p>
1693 * Attempts to pass a {@code null} value to this method results in
1694 * undefined behavior and, most likely, exceptions. The created model
1695 * references the given array directly. Attempts to modify the array
1696 * after invoking this method results in undefined behavior.
1697 *
1698 * @param listData an array of {@code E} containing the items to
1699 * display in the list
1700 * @see #setModel
1701 */
1702 public void setListData(final E[] listData) {
1703 setModel (
1704 new AbstractListModel<E>() {
1705 public int getSize() { return listData.length; }
1706 public E getElementAt(int i) { return listData[i]; }
1707 }
1708 );
1709 }
1710
1711
1712 /**
1713 * Constructs a read-only <code>ListModel</code> from a <code>Vector</code>
1714 * and calls {@code setModel} with this model.
1715 * <p>
1716 * Attempts to pass a {@code null} value to this method results in
1717 * undefined behavior and, most likely, exceptions. The created model
1718 * references the given {@code Vector} directly. Attempts to modify the
1719 * {@code Vector} after invoking this method results in undefined behavior.
1720 *
1721 * @param listData a <code>Vector</code> containing the items to
1722 * display in the list
1723 * @see #setModel
1724 */
1725 public void setListData(final Vector<? extends E> listData) {
1726 setModel (
1727 new AbstractListModel<E>() {
1728 public int getSize() { return listData.size(); }
1729 public E getElementAt(int i) { return listData.elementAt(i); }
1730 }
1731 );
1732 }
1733
1734
1735 /**
1736 * --- ListSelectionModel delegations and extensions ---
1737 */
1738
1739
1740 /**
1741 * Returns an instance of {@code DefaultListSelectionModel}; called
1742 * during construction to initialize the list's selection model
1743 * property.
1744 *
1745 * @return a {@code DefaultListSelecitonModel}, used to initialize
1746 * the list's selection model property during construction
1747 * @see #setSelectionModel
1748 * @see DefaultListSelectionModel
1749 */
1750 protected ListSelectionModel createSelectionModel() {
1751 return new DefaultListSelectionModel();
1752 }
1753
1754
1755 /**
1756 * Returns the current selection model. The selection model maintains the
1757 * selection state of the list. See the class level documentation for more
1758 * details.
1759 *
1760 * @return the <code>ListSelectionModel</code> that maintains the
1761 * list's selections
1762 *
1763 * @see #setSelectionModel
1764 * @see ListSelectionModel
1765 */
1766 public ListSelectionModel getSelectionModel() {
1767 return selectionModel;
1768 }
1769
1770
1771 /**
1772 * Notifies {@code ListSelectionListener}s added directly to the list
1773 * of selection changes made to the selection model. {@code JList}
1774 * listens for changes made to the selection in the selection model,
1775 * and forwards notification to listeners added to the list directly,
1776 * by calling this method.
1777 * <p>
1778 * This method constructs a {@code ListSelectionEvent} with this list
1779 * as the source, and the specified arguments, and sends it to the
1780 * registered {@code ListSelectionListeners}.
1781 *
1782 * @param firstIndex the first index in the range, {@code <= lastIndex}
1783 * @param lastIndex the last index in the range, {@code >= firstIndex}
1784 * @param isAdjusting whether or not this is one in a series of
1785 * multiple events, where changes are still being made
1786 *
1787 * @see #addListSelectionListener
1788 * @see #removeListSelectionListener
1789 * @see javax.swing.event.ListSelectionEvent
1790 * @see EventListenerList
1791 */
1792 protected void fireSelectionValueChanged(int firstIndex, int lastIndex,
1793 boolean isAdjusting)
1794 {
1795 Object[] listeners = listenerList.getListenerList();
1796 ListSelectionEvent e = null;
1797
1798 for (int i = listeners.length - 2; i >= 0; i -= 2) {
1799 if (listeners[i] == ListSelectionListener.class) {
1800 if (e == null) {
1801 e = new ListSelectionEvent(this, firstIndex, lastIndex,
1802 isAdjusting);
1803 }
1804 ((ListSelectionListener)listeners[i+1]).valueChanged(e);
1805 }
1806 }
1807 }
1808
1809
1810 /* A ListSelectionListener that forwards ListSelectionEvents from
1811 * the selectionModel to the JList ListSelectionListeners. The
1812 * forwarded events only differ from the originals in that their
1813 * source is the JList instead of the selectionModel itself.
1814 */
1815 private class ListSelectionHandler implements ListSelectionListener, Serializable
1816 {
1817 public void valueChanged(ListSelectionEvent e) {
1818 fireSelectionValueChanged(e.getFirstIndex(),
1819 e.getLastIndex(),
1820 e.getValueIsAdjusting());
1821 }
1822 }
1823
1824
1825 /**
1826 * Adds a listener to the list, to be notified each time a change to the
1827 * selection occurs; the preferred way of listening for selection state
1828 * changes. {@code JList} takes care of listening for selection state
1829 * changes in the selection model, and notifies the given listener of
1830 * each change. {@code ListSelectionEvent}s sent to the listener have a
1831 * {@code source} property set to this list.
1832 *
1833 * @param listener the {@code ListSelectionListener} to add
1834 * @see #getSelectionModel
1835 * @see #getListSelectionListeners
1836 */
1837 public void addListSelectionListener(ListSelectionListener listener)
1838 {
1839 if (selectionListener == null) {
1840 selectionListener = new ListSelectionHandler();
1841 getSelectionModel().addListSelectionListener(selectionListener);
1842 }
1843
1844 listenerList.add(ListSelectionListener.class, listener);
1845 }
1846
1847
1848 /**
1849 * Removes a selection listener from the list.
1850 *
1851 * @param listener the {@code ListSelectionListener} to remove
1852 * @see #addListSelectionListener
1853 * @see #getSelectionModel
1854 */
1855 public void removeListSelectionListener(ListSelectionListener listener) {
1856 listenerList.remove(ListSelectionListener.class, listener);
1857 }
1858
1859
1860 /**
1861 * Returns an array of all the {@code ListSelectionListener}s added
1862 * to this {@code JList} by way of {@code addListSelectionListener}.
1863 *
1864 * @return all of the {@code ListSelectionListener}s on this list, or
1865 * an empty array if no listeners have been added
1866 * @see #addListSelectionListener
1867 * @since 1.4
1868 */
1869 @BeanProperty(bound = false)
1870 public ListSelectionListener[] getListSelectionListeners() {
1871 return listenerList.getListeners(ListSelectionListener.class);
1872 }
1873
1874
1875 /**
1876 * Sets the <code>selectionModel</code> for the list to a
1877 * non-<code>null</code> <code>ListSelectionModel</code>
1878 * implementation. The selection model handles the task of making single
1879 * selections, selections of contiguous ranges, and non-contiguous
1880 * selections.
1881 * <p>
1882 * This is a JavaBeans bound property.
1883 *
1884 * @param selectionModel the <code>ListSelectionModel</code> that
1885 * implements the selections
1886 * @exception IllegalArgumentException if <code>selectionModel</code>
1887 * is <code>null</code>
1888 * @see #getSelectionModel
1889 */
1890 @BeanProperty(description
1891 = "The selection model, recording which cells are selected.")
1892 public void setSelectionModel(ListSelectionModel selectionModel) {
1893 if (selectionModel == null) {
1894 throw new IllegalArgumentException("selectionModel must be non null");
1895 }
1896
1897 /* Remove the forwarding ListSelectionListener from the old
1898 * selectionModel, and add it to the new one, if necessary.
1899 */
1900 if (selectionListener != null) {
1901 this.selectionModel.removeListSelectionListener(selectionListener);
1902 selectionModel.addListSelectionListener(selectionListener);
1903 }
1904
1905 ListSelectionModel oldValue = this.selectionModel;
1906 this.selectionModel = selectionModel;
1907 firePropertyChange("selectionModel", oldValue, selectionModel);
1908 }
1909
1910
1911 /**
1912 * Sets the selection mode for the list. This is a cover method that sets
1913 * the selection mode directly on the selection model.
1914 * <p>
1915 * The following list describes the accepted selection modes:
1916 * <ul>
1917 * <li>{@code ListSelectionModel.SINGLE_SELECTION} -
1918 * Only one list index can be selected at a time. In this mode,
1919 * {@code setSelectionInterval} and {@code addSelectionInterval} are
1920 * equivalent, both replacing the current selection with the index
1921 * represented by the second argument (the "lead").
1922 * <li>{@code ListSelectionModel.SINGLE_INTERVAL_SELECTION} -
1923 * Only one contiguous interval can be selected at a time.
1924 * In this mode, {@code addSelectionInterval} behaves like
1925 * {@code setSelectionInterval} (replacing the current selection},
1926 * unless the given interval is immediately adjacent to or overlaps
1927 * the existing selection, and can be used to grow the selection.
1928 * <li>{@code ListSelectionModel.MULTIPLE_INTERVAL_SELECTION} -
1929 * In this mode, there's no restriction on what can be selected.
1930 * This mode is the default.
1931 * </ul>
1932 *
1933 * @param selectionMode the selection mode
1934 * @see #getSelectionMode
1935 * @throws IllegalArgumentException if the selection mode isn't
1936 * one of those allowed
1937 */
1938 @BeanProperty(bound = false, enumerationValues = {
1939 "ListSelectionModel.SINGLE_SELECTION",
1940 "ListSelectionModel.SINGLE_INTERVAL_SELECTION",
1941 "ListSelectionModel.MULTIPLE_INTERVAL_SELECTION"}, description
1942 = "The selection mode.")
1943 public void setSelectionMode(int selectionMode) {
1944 getSelectionModel().setSelectionMode(selectionMode);
1945 }
1946
1947 /**
1948 * Returns the current selection mode for the list. This is a cover
1949 * method that delegates to the method of the same name on the
1950 * list's selection model.
1951 *
1952 * @return the current selection mode
1953 * @see #setSelectionMode
1954 */
1955 public int getSelectionMode() {
1956 return getSelectionModel().getSelectionMode();
1957 }
1958
1959
1960 /**
1961 * Returns the anchor selection index. This is a cover method that
1962 * delegates to the method of the same name on the list's selection model.
1963 *
1964 * @return the anchor selection index
1965 * @see ListSelectionModel#getAnchorSelectionIndex
1966 */
1967 @BeanProperty(bound = false)
1968 public int getAnchorSelectionIndex() {
1969 return getSelectionModel().getAnchorSelectionIndex();
1970 }
1971
1972
1973 /**
1974 * Returns the lead selection index. This is a cover method that
1975 * delegates to the method of the same name on the list's selection model.
1976 *
1977 * @return the lead selection index
1978 * @see ListSelectionModel#getLeadSelectionIndex
1979 */
1980 @BeanProperty(bound = false, description
1981 = "The lead selection index.")
1982 public int getLeadSelectionIndex() {
1983 return getSelectionModel().getLeadSelectionIndex();
1984 }
1985
1986
1987 /**
1988 * Returns the smallest selected cell index, or {@code -1} if the selection
1989 * is empty. This is a cover method that delegates to the method of the same
1990 * name on the list's selection model.
1991 *
1992 * @return the smallest selected cell index, or {@code -1}
1993 * @see ListSelectionModel#getMinSelectionIndex
1994 */
1995 @BeanProperty(bound = false)
1996 public int getMinSelectionIndex() {
1997 return getSelectionModel().getMinSelectionIndex();
1998 }
1999
2000
2001 /**
2002 * Returns the largest selected cell index, or {@code -1} if the selection
2003 * is empty. This is a cover method that delegates to the method of the same
2004 * name on the list's selection model.
2005 *
2006 * @return the largest selected cell index
2007 * @see ListSelectionModel#getMaxSelectionIndex
2008 */
2009 @BeanProperty(bound = false)
2010 public int getMaxSelectionIndex() {
2011 return getSelectionModel().getMaxSelectionIndex();
2012 }
2013
2014
2015 /**
2016 * Returns {@code true} if the specified index is selected,
2017 * else {@code false}. This is a cover method that delegates to the method
2018 * of the same name on the list's selection model.
2019 *
2020 * @param index index to be queried for selection state
2021 * @return {@code true} if the specified index is selected,
2022 * else {@code false}
2023 * @see ListSelectionModel#isSelectedIndex
2024 * @see #setSelectedIndex
2025 */
2026 public boolean isSelectedIndex(int index) {
2027 return getSelectionModel().isSelectedIndex(index);
2028 }
2029
2030
2031 /**
2032 * Returns {@code true} if nothing is selected, else {@code false}.
2033 * This is a cover method that delegates to the method of the same
2034 * name on the list's selection model.
2035 *
2036 * @return {@code true} if nothing is selected, else {@code false}
2037 * @see ListSelectionModel#isSelectionEmpty
2038 * @see #clearSelection
2039 */
2040 @BeanProperty(bound = false)
2041 public boolean isSelectionEmpty() {
2042 return getSelectionModel().isSelectionEmpty();
2043 }
2044
2045
2046 /**
2047 * Clears the selection; after calling this method, {@code isSelectionEmpty}
2048 * will return {@code true}. This is a cover method that delegates to the
2049 * method of the same name on the list's selection model.
2050 *
2051 * @see ListSelectionModel#clearSelection
2052 * @see #isSelectionEmpty
2053 */
2054 public void clearSelection() {
2055 getSelectionModel().clearSelection();
2056 }
2057
2058
2059 /**
2060 * Selects the specified interval. Both {@code anchor} and {@code lead}
2061 * indices are included. {@code anchor} doesn't have to be less than or
2062 * equal to {@code lead}. This is a cover method that delegates to the
2063 * method of the same name on the list's selection model.
2064 * <p>
2065 * Refer to the documentation of the selection model class being used
2066 * for details on how values less than {@code 0} are handled.
2067 *
2068 * @param anchor the first index to select
2069 * @param lead the last index to select
2070 * @see ListSelectionModel#setSelectionInterval
2071 * @see DefaultListSelectionModel#setSelectionInterval
2072 * @see #createSelectionModel
2073 * @see #addSelectionInterval
2074 * @see #removeSelectionInterval
2075 */
2076 public void setSelectionInterval(int anchor, int lead) {
2077 getSelectionModel().setSelectionInterval(anchor, lead);
2078 }
2079
2080
2081 /**
2082 * Sets the selection to be the union of the specified interval with current
2083 * selection. Both the {@code anchor} and {@code lead} indices are
2084 * included. {@code anchor} doesn't have to be less than or
2085 * equal to {@code lead}. This is a cover method that delegates to the
2086 * method of the same name on the list's selection model.
2087 * <p>
2088 * Refer to the documentation of the selection model class being used
2089 * for details on how values less than {@code 0} are handled.
2090 *
2091 * @param anchor the first index to add to the selection
2092 * @param lead the last index to add to the selection
2093 * @see ListSelectionModel#addSelectionInterval
2094 * @see DefaultListSelectionModel#addSelectionInterval
2095 * @see #createSelectionModel
2096 * @see #setSelectionInterval
2097 * @see #removeSelectionInterval
2098 */
2099 public void addSelectionInterval(int anchor, int lead) {
2100 getSelectionModel().addSelectionInterval(anchor, lead);
2101 }
2102
2103
2104 /**
2105 * Sets the selection to be the set difference of the specified interval
2106 * and the current selection. Both the {@code index0} and {@code index1}
2107 * indices are removed. {@code index0} doesn't have to be less than or
2108 * equal to {@code index1}. This is a cover method that delegates to the
2109 * method of the same name on the list's selection model.
2110 * <p>
2111 * Refer to the documentation of the selection model class being used
2112 * for details on how values less than {@code 0} are handled.
2113 *
2114 * @param index0 the first index to remove from the selection
2115 * @param index1 the last index to remove from the selection
2116 * @see ListSelectionModel#removeSelectionInterval
2117 * @see DefaultListSelectionModel#removeSelectionInterval
2118 * @see #createSelectionModel
2119 * @see #setSelectionInterval
2120 * @see #addSelectionInterval
2121 */
2122 public void removeSelectionInterval(int index0, int index1) {
2123 getSelectionModel().removeSelectionInterval(index0, index1);
2124 }
2125
2126
2127 /**
2128 * Sets the selection model's {@code valueIsAdjusting} property. When
2129 * {@code true}, upcoming changes to selection should be considered part
2130 * of a single change. This property is used internally and developers
2131 * typically need not call this method. For example, when the model is being
2132 * updated in response to a user drag, the value of the property is set
2133 * to {@code true} when the drag is initiated and set to {@code false}
2134 * when the drag is finished. This allows listeners to update only
2135 * when a change has been finalized, rather than handling all of the
2136 * intermediate values.
2137 * <p>
2138 * You may want to use this directly if making a series of changes
2139 * that should be considered part of a single change.
2140 * <p>
2141 * This is a cover method that delegates to the method of the same name on
2142 * the list's selection model. See the documentation for
2143 * {@link javax.swing.ListSelectionModel#setValueIsAdjusting} for
2144 * more details.
2145 *
2146 * @param b the new value for the property
2147 * @see ListSelectionModel#setValueIsAdjusting
2148 * @see javax.swing.event.ListSelectionEvent#getValueIsAdjusting
2149 * @see #getValueIsAdjusting
2150 */
2151 public void setValueIsAdjusting(boolean b) {
2152 getSelectionModel().setValueIsAdjusting(b);
2153 }
2154
2155
2156 /**
2157 * Returns the value of the selection model's {@code isAdjusting} property.
2158 * <p>
2159 * This is a cover method that delegates to the method of the same name on
2160 * the list's selection model.
2161 *
2162 * @return the value of the selection model's {@code isAdjusting} property.
2163 *
2164 * @see #setValueIsAdjusting
2165 * @see ListSelectionModel#getValueIsAdjusting
2166 */
2167 public boolean getValueIsAdjusting() {
2168 return getSelectionModel().getValueIsAdjusting();
2169 }
2170
2171
2172 /**
2173 * Returns an array of all of the selected indices, in increasing
2174 * order.
2175 *
2176 * @return all of the selected indices, in increasing order,
2177 * or an empty array if nothing is selected
2178 * @see #removeSelectionInterval
2179 * @see #addListSelectionListener
2180 */
2181 @Transient
2182 public int[] getSelectedIndices() {
2183 ListSelectionModel sm = getSelectionModel();
2184 int iMin = sm.getMinSelectionIndex();
2185 int iMax = sm.getMaxSelectionIndex();
2186
2187 if ((iMin < 0) || (iMax < 0)) {
2188 return new int[0];
2189 }
2190
2191 int[] rvTmp = new int[1+ (iMax - iMin)];
2192 int n = 0;
2193 for(int i = iMin; i <= iMax; i++) {
2194 if (sm.isSelectedIndex(i)) {
2195 rvTmp[n++] = i;
2196 }
2197 }
2198 int[] rv = new int[n];
2199 System.arraycopy(rvTmp, 0, rv, 0, n);
2200 return rv;
2201 }
2202
2203
2204 /**
2205 * Selects a single cell. Does nothing if the given index is greater
2206 * than or equal to the model size. This is a convenience method that uses
2207 * {@code setSelectionInterval} on the selection model. Refer to the
2208 * documentation for the selection model class being used for details on
2209 * how values less than {@code 0} are handled.
2210 *
2211 * @param index the index of the cell to select
2212 * @see ListSelectionModel#setSelectionInterval
2213 * @see #isSelectedIndex
2214 * @see #addListSelectionListener
2215 */
2216 @BeanProperty(bound = false, description
2217 = "The index of the selected cell.")
2218 public void setSelectedIndex(int index) {
2219 if (index >= getModel().getSize()) {
2220 return;
2221 }
2222 getSelectionModel().setSelectionInterval(index, index);
2223 }
2224
2225
2226 /**
2227 * Changes the selection to be the set of indices specified by the given
2228 * array. Indices greater than or equal to the model size are ignored.
2229 * This is a convenience method that clears the selection and then uses
2230 * {@code addSelectionInterval} on the selection model to add the indices.
2231 * Refer to the documentation of the selection model class being used for
2232 * details on how values less than {@code 0} are handled.
2233 *
2234 * @param indices an array of the indices of the cells to select,
2235 * {@code non-null}
2236 * @see ListSelectionModel#addSelectionInterval
2237 * @see #isSelectedIndex
2238 * @see #addListSelectionListener
2239 * @throws NullPointerException if the given array is {@code null}
2240 */
2241 public void setSelectedIndices(int[] indices) {
2242 ListSelectionModel sm = getSelectionModel();
2243 sm.clearSelection();
2244 int size = getModel().getSize();
2245 for (int i : indices) {
2246 if (i < size) {
2247 sm.addSelectionInterval(i, i);
2248 }
2249 }
2250 }
2251
2252
2253 /**
2254 * Returns an array of all the selected values, in increasing order based
2255 * on their indices in the list.
2256 *
2257 * @return the selected values, or an empty array if nothing is selected
2258 * @see #isSelectedIndex
2259 * @see #getModel
2260 * @see #addListSelectionListener
2261 *
2262 * @deprecated As of JDK 1.7, replaced by {@link #getSelectedValuesList()}
2263 */
2264 @Deprecated
2265 @BeanProperty(bound = false)
2266 public Object[] getSelectedValues() {
2267 ListSelectionModel sm = getSelectionModel();
2268 ListModel<E> dm = getModel();
2269
2270 int iMin = sm.getMinSelectionIndex();
2271 int iMax = sm.getMaxSelectionIndex();
2272
2273 if ((iMin < 0) || (iMax < 0)) {
2274 return new Object[0];
2275 }
2276
2277 Object[] rvTmp = new Object[1+ (iMax - iMin)];
2278 int n = 0;
2279 for(int i = iMin; i <= iMax; i++) {
2280 if (sm.isSelectedIndex(i)) {
2281 rvTmp[n++] = dm.getElementAt(i);
2282 }
2283 }
2284 Object[] rv = new Object[n];
2285 System.arraycopy(rvTmp, 0, rv, 0, n);
2286 return rv;
2287 }
2288
2289 /**
2290 * Returns a list of all the selected items, in increasing order based
2291 * on their indices in the list.
2292 *
2293 * @return the selected items, or an empty list if nothing is selected
2294 * @see #isSelectedIndex
2295 * @see #getModel
2296 * @see #addListSelectionListener
2297 *
2298 * @since 1.7
2299 */
2300 @BeanProperty(bound = false)
2301 public List<E> getSelectedValuesList() {
2302 ListSelectionModel sm = getSelectionModel();
2303 ListModel<E> dm = getModel();
2304
2305 int iMin = sm.getMinSelectionIndex();
2306 int iMax = sm.getMaxSelectionIndex();
2307
2308 if ((iMin < 0) || (iMax < 0)) {
2309 return Collections.emptyList();
2310 }
2311
2312 List<E> selectedItems = new ArrayList<E>();
2313 for(int i = iMin; i <= iMax; i++) {
2314 if (sm.isSelectedIndex(i)) {
2315 selectedItems.add(dm.getElementAt(i));
2316 }
2317 }
2318 return selectedItems;
2319 }
2320
2321
2322 /**
2323 * Returns the smallest selected cell index; <i>the selection</i> when only
2324 * a single item is selected in the list. When multiple items are selected,
2325 * it is simply the smallest selected index. Returns {@code -1} if there is
2326 * no selection.
2327 * <p>
2328 * This method is a cover that delegates to {@code getMinSelectionIndex}.
2329 *
2330 * @return the smallest selected cell index
2331 * @see #getMinSelectionIndex
2332 * @see #addListSelectionListener
2333 */
2334 public int getSelectedIndex() {
2335 return getMinSelectionIndex();
2336 }
2337
2338
2339 /**
2340 * Returns the value for the smallest selected cell index;
2341 * <i>the selected value</i> when only a single item is selected in the
2342 * list. When multiple items are selected, it is simply the value for the
2343 * smallest selected index. Returns {@code null} if there is no selection.
2344 * <p>
2345 * This is a convenience method that simply returns the model value for
2346 * {@code getMinSelectionIndex}.
2347 *
2348 * @return the first selected value
2349 * @see #getMinSelectionIndex
2350 * @see #getModel
2351 * @see #addListSelectionListener
2352 */
2353 @BeanProperty(bound = false)
2354 public E getSelectedValue() {
2355 int i = getMinSelectionIndex();
2356 return (i == -1) ? null : getModel().getElementAt(i);
2357 }
2358
2359
2360 /**
2361 * Selects the specified object from the list.
2362 *
2363 * @param anObject the object to select
2364 * @param shouldScroll {@code true} if the list should scroll to display
2365 * the selected object, if one exists; otherwise {@code false}
2366 */
2367 public void setSelectedValue(Object anObject,boolean shouldScroll) {
2368 if(anObject == null)
2369 setSelectedIndex(-1);
2370 else if(!anObject.equals(getSelectedValue())) {
2371 int i,c;
2372 ListModel<E> dm = getModel();
2373 for(i=0,c=dm.getSize();i<c;i++)
2374 if(anObject.equals(dm.getElementAt(i))){
2375 setSelectedIndex(i);
2376 if(shouldScroll)
2377 ensureIndexIsVisible(i);
2378 repaint(); /** FIX-ME setSelectedIndex does not redraw all the time with the basic l&f**/
2379 return;
2380 }
2381 setSelectedIndex(-1);
2382 }
2383 repaint(); /** FIX-ME setSelectedIndex does not redraw all the time with the basic l&f**/
2384 }
2385
2386
2387
2388 /**
2389 * --- The Scrollable Implementation ---
2390 */
2391
2392 private void checkScrollableParameters(Rectangle visibleRect, int orientation) {
2393 if (visibleRect == null) {
2394 throw new IllegalArgumentException("visibleRect must be non-null");
2395 }
2396 switch (orientation) {
2397 case SwingConstants.VERTICAL:
2398 case SwingConstants.HORIZONTAL:
2399 break;
2400 default:
2401 throw new IllegalArgumentException("orientation must be one of: VERTICAL, HORIZONTAL");
2402 }
2403 }
2404
2405
2406 /**
2407 * Computes the size of viewport needed to display {@code visibleRowCount}
2408 * rows. The value returned by this method depends on the layout
2409 * orientation:
2410 * <p>
2411 * <b>{@code VERTICAL}:</b>
2412 * <br>
2413 * This is trivial if both {@code fixedCellWidth} and {@code fixedCellHeight}
2414 * have been set (either explicitly or by specifying a prototype cell value).
2415 * The width is simply the {@code fixedCellWidth} plus the list's horizontal
2416 * insets. The height is the {@code fixedCellHeight} multiplied by the
2417 * {@code visibleRowCount}, plus the list's vertical insets.
2418 * <p>
2419 * If either {@code fixedCellWidth} or {@code fixedCellHeight} haven't been
2420 * specified, heuristics are used. If the model is empty, the width is
2421 * the {@code fixedCellWidth}, if greater than {@code 0}, or a hard-coded
2422 * value of {@code 256}. The height is the {@code fixedCellHeight} multiplied
2423 * by {@code visibleRowCount}, if {@code fixedCellHeight} is greater than
2424 * {@code 0}, otherwise it is a hard-coded value of {@code 16} multiplied by
2425 * {@code visibleRowCount}.
2426 * <p>
2427 * If the model isn't empty, the width is the preferred size's width,
2428 * typically the width of the widest list element. The height is the
2429 * {@code fixedCellHeight} multiplied by the {@code visibleRowCount},
2430 * plus the list's vertical insets.
2431 * <p>
2432 * <b>{@code VERTICAL_WRAP} or {@code HORIZONTAL_WRAP}:</b>
2433 * <br>
2434 * This method simply returns the value from {@code getPreferredSize}.
2435 * The list's {@code ListUI} is expected to override {@code getPreferredSize}
2436 * to return an appropriate value.
2437 *
2438 * @return a dimension containing the size of the viewport needed
2439 * to display {@code visibleRowCount} rows
2440 * @see #getPreferredScrollableViewportSize
2441 * @see #setPrototypeCellValue
2442 */
2443 @BeanProperty(bound = false)
2444 public Dimension getPreferredScrollableViewportSize()
2445 {
2446 if (getLayoutOrientation() != VERTICAL) {
2447 return getPreferredSize();
2448 }
2449 Insets insets = getInsets();
2450 int dx = insets.left + insets.right;
2451 int dy = insets.top + insets.bottom;
2452
2453 int visibleRowCount = getVisibleRowCount();
2454 int fixedCellWidth = getFixedCellWidth();
2455 int fixedCellHeight = getFixedCellHeight();
2456
2457 if ((fixedCellWidth > 0) && (fixedCellHeight > 0)) {
2458 int width = fixedCellWidth + dx;
2459 int height = (visibleRowCount * fixedCellHeight) + dy;
2460 return new Dimension(width, height);
2461 }
2462 else if (getModel().getSize() > 0) {
2463 int width = getPreferredSize().width;
2464 int height;
2465 Rectangle r = getCellBounds(0, 0);
2466 if (r != null) {
2467 height = (visibleRowCount * r.height) + dy;
2468 }
2469 else {
2470 // Will only happen if UI null, shouldn't matter what we return
2471 height = 1;
2472 }
2473 return new Dimension(width, height);
2474 }
2475 else {
2476 fixedCellWidth = (fixedCellWidth > 0) ? fixedCellWidth : 256;
2477 fixedCellHeight = (fixedCellHeight > 0) ? fixedCellHeight : 16;
2478 return new Dimension(fixedCellWidth, fixedCellHeight * visibleRowCount);
2479 }
2480 }
2481
2482
2483 /**
2484 * Returns the distance to scroll to expose the next or previous
2485 * row (for vertical scrolling) or column (for horizontal scrolling).
2486 * <p>
2487 * For horizontal scrolling, if the layout orientation is {@code VERTICAL},
2488 * then the list's font size is returned (or {@code 1} if the font is
2489 * {@code null}).
2490 *
2491 * @param visibleRect the view area visible within the viewport
2492 * @param orientation {@code SwingConstants.HORIZONTAL} or
2493 * {@code SwingConstants.VERTICAL}
2494 * @param direction less or equal to zero to scroll up/back,
2495 * greater than zero for down/forward
2496 * @return the "unit" increment for scrolling in the specified direction;
2497 * always positive
2498 * @see #getScrollableBlockIncrement
2499 * @see Scrollable#getScrollableUnitIncrement
2500 * @throws IllegalArgumentException if {@code visibleRect} is {@code null}, or
2501 * {@code orientation} isn't one of {@code SwingConstants.VERTICAL} or
2502 * {@code SwingConstants.HORIZONTAL}
2503 */
2504 public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction)
2505 {
2506 checkScrollableParameters(visibleRect, orientation);
2507
2508 if (orientation == SwingConstants.VERTICAL) {
2509 int row = locationToIndex(visibleRect.getLocation());
2510
2511 if (row == -1) {
2512 return 0;
2513 }
2514 else {
2515 /* Scroll Down */
2516 if (direction > 0) {
2517 Rectangle r = getCellBounds(row, row);
2518 return (r == null) ? 0 : r.height - (visibleRect.y - r.y);
2519 }
2520 /* Scroll Up */
2521 else {
2522 Rectangle r = getCellBounds(row, row);
2523
2524 /* The first row is completely visible and it's row 0.
2525 * We're done.
2526 */
2527 if ((r.y == visibleRect.y) && (row == 0)) {
2528 return 0;
2529 }
2530 /* The first row is completely visible, return the
2531 * height of the previous row or 0 if the first row
2532 * is the top row of the list.
2533 */
2534 else if (r.y == visibleRect.y) {
2535 Point loc = r.getLocation();
2536 loc.y--;
2537 int prevIndex = locationToIndex(loc);
2538 Rectangle prevR = getCellBounds(prevIndex, prevIndex);
2539
2540 if (prevR == null || prevR.y >= r.y) {
2541 return 0;
2542 }
2543 return prevR.height;
2544 }
2545 /* The first row is partially visible, return the
2546 * height of hidden part.
2547 */
2548 else {
2549 return visibleRect.y - r.y;
2550 }
2551 }
2552 }
2553 } else if (orientation == SwingConstants.HORIZONTAL &&
2554 getLayoutOrientation() != JList.VERTICAL) {
2555 boolean leftToRight = getComponentOrientation().isLeftToRight();
2556 int index;
2557 Point leadingPoint;
2558
2559 if (leftToRight) {
2560 leadingPoint = visibleRect.getLocation();
2561 }
2562 else {
2563 leadingPoint = new Point(visibleRect.x + visibleRect.width -1,
2564 visibleRect.y);
2565 }
2566 index = locationToIndex(leadingPoint);
2567
2568 if (index != -1) {
2569 Rectangle cellBounds = getCellBounds(index, index);
2570 if (cellBounds != null && cellBounds.contains(leadingPoint)) {
2571 int leadingVisibleEdge;
2572 int leadingCellEdge;
2573
2574 if (leftToRight) {
2575 leadingVisibleEdge = visibleRect.x;
2576 leadingCellEdge = cellBounds.x;
2577 }
2578 else {
2579 leadingVisibleEdge = visibleRect.x + visibleRect.width;
2580 leadingCellEdge = cellBounds.x + cellBounds.width;
2581 }
2582
2583 if (leadingCellEdge != leadingVisibleEdge) {
2584 if (direction < 0) {
2585 // Show remainder of leading cell
2586 return Math.abs(leadingVisibleEdge - leadingCellEdge);
2587
2588 }
2589 else if (leftToRight) {
2590 // Hide rest of leading cell
2591 return leadingCellEdge + cellBounds.width - leadingVisibleEdge;
2592 }
2593 else {
2594 // Hide rest of leading cell
2595 return leadingVisibleEdge - cellBounds.x;
2596 }
2597 }
2598 // ASSUME: All cells are the same width
2599 return cellBounds.width;
2600 }
2601 }
2602 }
2603 Font f = getFont();
2604 return (f != null) ? f.getSize() : 1;
2605 }
2606
2607
2608 /**
2609 * Returns the distance to scroll to expose the next or previous block.
2610 * <p>
2611 * For vertical scrolling, the following rules are used:
2612 * <ul>
2613 * <li>if scrolling down, returns the distance to scroll so that the last
2614 * visible element becomes the first completely visible element
2615 * <li>if scrolling up, returns the distance to scroll so that the first
2616 * visible element becomes the last completely visible element
2617 * <li>returns {@code visibleRect.height} if the list is empty
2618 * </ul>
2619 * <p>
2620 * For horizontal scrolling, when the layout orientation is either
2621 * {@code VERTICAL_WRAP} or {@code HORIZONTAL_WRAP}:
2622 * <ul>
2623 * <li>if scrolling right, returns the distance to scroll so that the
2624 * last visible element becomes
2625 * the first completely visible element
2626 * <li>if scrolling left, returns the distance to scroll so that the first
2627 * visible element becomes the last completely visible element
2628 * <li>returns {@code visibleRect.width} if the list is empty
2629 * </ul>
2630 * <p>
2631 * For horizontal scrolling and {@code VERTICAL} orientation,
2632 * returns {@code visibleRect.width}.
2633 * <p>
2634 * Note that the value of {@code visibleRect} must be the equal to
2635 * {@code this.getVisibleRect()}.
2636 *
2637 * @param visibleRect the view area visible within the viewport
2638 * @param orientation {@code SwingConstants.HORIZONTAL} or
2639 * {@code SwingConstants.VERTICAL}
2640 * @param direction less or equal to zero to scroll up/back,
2641 * greater than zero for down/forward
2642 * @return the "block" increment for scrolling in the specified direction;
2643 * always positive
2644 * @see #getScrollableUnitIncrement
2645 * @see Scrollable#getScrollableBlockIncrement
2646 * @throws IllegalArgumentException if {@code visibleRect} is {@code null}, or
2647 * {@code orientation} isn't one of {@code SwingConstants.VERTICAL} or
2648 * {@code SwingConstants.HORIZONTAL}
2649 */
2650 public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
2651 checkScrollableParameters(visibleRect, orientation);
2652 if (orientation == SwingConstants.VERTICAL) {
2653 int inc = visibleRect.height;
2654 /* Scroll Down */
2655 if (direction > 0) {
2656 // last cell is the lowest left cell
2657 int last = locationToIndex(new Point(visibleRect.x, visibleRect.y+visibleRect.height-1));
2658 if (last != -1) {
2659 Rectangle lastRect = getCellBounds(last,last);
2660 if (lastRect != null) {
2661 inc = lastRect.y - visibleRect.y;
2662 if ( (inc == 0) && (last < getModel().getSize()-1) ) {
2663 inc = lastRect.height;
2664 }
2665 }
2666 }
2667 }
2668 /* Scroll Up */
2669 else {
2670 int newFirst = locationToIndex(new Point(visibleRect.x, visibleRect.y-visibleRect.height));
2671 int first = getFirstVisibleIndex();
2672 if (newFirst != -1) {
2673 if (first == -1) {
2674 first = locationToIndex(visibleRect.getLocation());
2675 }
2676 Rectangle newFirstRect = getCellBounds(newFirst,newFirst);
2677 Rectangle firstRect = getCellBounds(first,first);
2678 if ((newFirstRect != null) && (firstRect!=null)) {
2679 while ( (newFirstRect.y + visibleRect.height <
2680 firstRect.y + firstRect.height) &&
2681 (newFirstRect.y < firstRect.y) ) {
2682 newFirst++;
2683 newFirstRect = getCellBounds(newFirst,newFirst);
2684 }
2685 inc = visibleRect.y - newFirstRect.y;
2686 if ( (inc <= 0) && (newFirstRect.y > 0)) {
2687 newFirst--;
2688 newFirstRect = getCellBounds(newFirst,newFirst);
2689 if (newFirstRect != null) {
2690 inc = visibleRect.y - newFirstRect.y;
2691 }
2692 }
2693 }
2694 }
2695 }
2696 return inc;
2697 }
2698 else if (orientation == SwingConstants.HORIZONTAL &&
2699 getLayoutOrientation() != JList.VERTICAL) {
2700 boolean leftToRight = getComponentOrientation().isLeftToRight();
2701 int inc = visibleRect.width;
2702 /* Scroll Right (in ltr mode) or Scroll Left (in rtl mode) */
2703 if (direction > 0) {
2704 // position is upper right if ltr, or upper left otherwise
2705 int x = visibleRect.x + (leftToRight ? (visibleRect.width - 1) : 0);
2706 int last = locationToIndex(new Point(x, visibleRect.y));
2707
2708 if (last != -1) {
2709 Rectangle lastRect = getCellBounds(last,last);
2710 if (lastRect != null) {
2711 if (leftToRight) {
2712 inc = lastRect.x - visibleRect.x;
2713 } else {
2714 inc = visibleRect.x + visibleRect.width
2715 - (lastRect.x + lastRect.width);
2716 }
2717 if (inc < 0) {
2718 inc += lastRect.width;
2719 } else if ( (inc == 0) && (last < getModel().getSize()-1) ) {
2720 inc = lastRect.width;
2721 }
2722 }
2723 }
2724 }
2725 /* Scroll Left (in ltr mode) or Scroll Right (in rtl mode) */
2726 else {
2727 // position is upper left corner of the visibleRect shifted
2728 // left by the visibleRect.width if ltr, or upper right shifted
2729 // right by the visibleRect.width otherwise
2730 int x = visibleRect.x + (leftToRight
2731 ? -visibleRect.width
2732 : visibleRect.width - 1 + visibleRect.width);
2733 int first = locationToIndex(new Point(x, visibleRect.y));
2734
2735 if (first != -1) {
2736 Rectangle firstRect = getCellBounds(first,first);
2737 if (firstRect != null) {
2738 // the right of the first cell
2739 int firstRight = firstRect.x + firstRect.width;
2740
2741 if (leftToRight) {
2742 if ((firstRect.x < visibleRect.x - visibleRect.width)
2743 && (firstRight < visibleRect.x)) {
2744 inc = visibleRect.x - firstRight;
2745 } else {
2746 inc = visibleRect.x - firstRect.x;
2747 }
2748 } else {
2749 int visibleRight = visibleRect.x + visibleRect.width;
2750
2751 if ((firstRight > visibleRight + visibleRect.width)
2752 && (firstRect.x > visibleRight)) {
2753 inc = firstRect.x - visibleRight;
2754 } else {
2755 inc = firstRight - visibleRight;
2756 }
2757 }
2758 }
2759 }
2760 }
2761 return inc;
2762 }
2763 return visibleRect.width;
2764 }
2765
2766
2767 /**
2768 * Returns {@code true} if this {@code JList} is displayed in a
2769 * {@code JViewport} and the viewport is wider than the list's
2770 * preferred width, or if the layout orientation is {@code HORIZONTAL_WRAP}
2771 * and {@code visibleRowCount <= 0}; otherwise returns {@code false}.
2772 * <p>
2773 * If {@code false}, then don't track the viewport's width. This allows
2774 * horizontal scrolling if the {@code JViewport} is itself embedded in a
2775 * {@code JScrollPane}.
2776 *
2777 * @return whether or not an enclosing viewport should force the list's
2778 * width to match its own
2779 * @see Scrollable#getScrollableTracksViewportWidth
2780 */
2781 @BeanProperty(bound = false)
2782 public boolean getScrollableTracksViewportWidth() {
2783 if (getLayoutOrientation() == HORIZONTAL_WRAP &&
2784 getVisibleRowCount() <= 0) {
2785 return true;
2786 }
2787 Container parent = SwingUtilities.getUnwrappedParent(this);
2788 if (parent instanceof JViewport) {
2789 return parent.getWidth() > getPreferredSize().width;
2790 }
2791 return false;
2792 }
2793
2794 /**
2795 * Returns {@code true} if this {@code JList} is displayed in a
2796 * {@code JViewport} and the viewport is taller than the list's
2797 * preferred height, or if the layout orientation is {@code VERTICAL_WRAP}
2798 * and {@code visibleRowCount <= 0}; otherwise returns {@code false}.
2799 * <p>
2800 * If {@code false}, then don't track the viewport's height. This allows
2801 * vertical scrolling if the {@code JViewport} is itself embedded in a
2802 * {@code JScrollPane}.
2803 *
2804 * @return whether or not an enclosing viewport should force the list's
2805 * height to match its own
2806 * @see Scrollable#getScrollableTracksViewportHeight
2807 */
2808 @BeanProperty(bound = false)
2809 public boolean getScrollableTracksViewportHeight() {
2810 if (getLayoutOrientation() == VERTICAL_WRAP &&
2811 getVisibleRowCount() <= 0) {
2812 return true;
2813 }
2814 Container parent = SwingUtilities.getUnwrappedParent(this);
2815 if (parent instanceof JViewport) {
2816 return parent.getHeight() > getPreferredSize().height;
2817 }
2818 return false;
2819 }
2820
2821
2822 /*
2823 * See {@code readObject} and {@code writeObject} in {@code JComponent}
2824 * for more information about serialization in Swing.
2825 */
2826 private void writeObject(ObjectOutputStream s) throws IOException {
2827 s.defaultWriteObject();
2828 if (getUIClassID().equals(uiClassID)) {
2829 byte count = JComponent.getWriteObjCounter(this);
2830 JComponent.setWriteObjCounter(this, --count);
2831 if (count == 0 && ui != null) {
2832 ui.installUI(this);
2833 }
2834 }
2835 }
2836
2837
2838 /**
2839 * Returns a {@code String} representation of this {@code JList}.
2840 * This method is intended to be used only for debugging purposes,
2841 * and the content and format of the returned {@code String} may vary
2842 * between implementations. The returned {@code String} may be empty,
2843 * but may not be {@code null}.
2844 *
2845 * @return a {@code String} representation of this {@code JList}.
2846 */
2847 protected String paramString() {
2848 String selectionForegroundString = (selectionForeground != null ?
2849 selectionForeground.toString() :
2850 "");
2851 String selectionBackgroundString = (selectionBackground != null ?
2852 selectionBackground.toString() :
2853 "");
2854
2855 return super.paramString() +
2856 ",fixedCellHeight=" + fixedCellHeight +
2857 ",fixedCellWidth=" + fixedCellWidth +
2858 ",horizontalScrollIncrement=" + horizontalScrollIncrement +
2859 ",selectionBackground=" + selectionBackgroundString +
2860 ",selectionForeground=" + selectionForegroundString +
2861 ",visibleRowCount=" + visibleRowCount +
2862 ",layoutOrientation=" + layoutOrientation;
2863 }
2864
2865
2866 /**
2867 * --- Accessibility Support ---
2868 */
2869
2870 /**
2871 * Gets the {@code AccessibleContext} associated with this {@code JList}.
2872 * For {@code JList}, the {@code AccessibleContext} takes the form of an
2873 * {@code AccessibleJList}.
2874 * <p>
2875 * A new {@code AccessibleJList} instance is created if necessary.
2876 *
2877 * @return an {@code AccessibleJList} that serves as the
2878 * {@code AccessibleContext} of this {@code JList}
2879 */
2880 @BeanProperty(bound = false)
2881 public AccessibleContext getAccessibleContext() {
2882 if (accessibleContext == null) {
2883 accessibleContext = new AccessibleJList();
2884 }
2885 return accessibleContext;
2886 }
2887
2888 /**
2889 * This class implements accessibility support for the
2890 * {@code JList} class. It provides an implementation of the
2891 * Java Accessibility API appropriate to list user-interface
2892 * elements.
2893 * <p>
2894 * <strong>Warning:</strong>
2895 * Serialized objects of this class will not be compatible with
2896 * future Swing releases. The current serialization support is
2897 * appropriate for short term storage or RMI between applications running
2898 * the same version of Swing. As of 1.4, support for long term storage
2899 * of all JavaBeans™
2900 * has been added to the <code>java.beans</code> package.
2901 * Please see {@link java.beans.XMLEncoder}.
2902 */
2903 @SuppressWarnings("serial") // Same-version serialization only
2904 protected class AccessibleJList extends AccessibleJComponent
2905 implements AccessibleSelection, PropertyChangeListener,
2906 ListSelectionListener, ListDataListener {
2907
2908 int leadSelectionIndex;
2909
2910 /**
2911 * Constructs an {@code AccessibleJList}.
2912 */
2913 public AccessibleJList() {
2914 super();
2915 JList.this.addPropertyChangeListener(this);
2916 JList.this.getSelectionModel().addListSelectionListener(this);
2917 JList.this.getModel().addListDataListener(this);
2918 leadSelectionIndex = JList.this.getLeadSelectionIndex();
2919 }
2920
2921 /**
2922 * Property Change Listener change method. Used to track changes
2923 * to the DataModel and ListSelectionModel, in order to re-set
2924 * listeners to those for reporting changes there via the Accessibility
2925 * PropertyChange mechanism.
2926 *
2927 * @param e PropertyChangeEvent
2928 */
2929 public void propertyChange(PropertyChangeEvent e) {
2930 String name = e.getPropertyName();
2931 Object oldValue = e.getOldValue();
2932 Object newValue = e.getNewValue();
2933
2934 // re-set listData listeners
2935 if (name.compareTo("model") == 0) {
2936
2937 if (oldValue != null && oldValue instanceof ListModel) {
2938 ((ListModel) oldValue).removeListDataListener(this);
2939 }
2940 if (newValue != null && newValue instanceof ListModel) {
2941 ((ListModel) newValue).addListDataListener(this);
2942 }
2943
2944 // re-set listSelectionModel listeners
2945 } else if (name.compareTo("selectionModel") == 0) {
2946
2947 if (oldValue != null && oldValue instanceof ListSelectionModel) {
2948 ((ListSelectionModel) oldValue).removeListSelectionListener(this);
2949 }
2950 if (newValue != null && newValue instanceof ListSelectionModel) {
2951 ((ListSelectionModel) newValue).addListSelectionListener(this);
2952 }
2953
2954 firePropertyChange(
2955 AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
2956 Boolean.valueOf(false), Boolean.valueOf(true));
2957 }
2958 }
2959
2960 /**
2961 * List Selection Listener value change method. Used to fire
2962 * the property change
2963 *
2964 * @param e ListSelectionEvent
2965 *
2966 */
2967 public void valueChanged(ListSelectionEvent e) {
2968 int oldLeadSelectionIndex = leadSelectionIndex;
2969 leadSelectionIndex = JList.this.getLeadSelectionIndex();
2970 if (oldLeadSelectionIndex != leadSelectionIndex) {
2971 Accessible oldLS, newLS;
2972 oldLS = (oldLeadSelectionIndex >= 0)
2973 ? getAccessibleChild(oldLeadSelectionIndex)
2974 : null;
2975 newLS = (leadSelectionIndex >= 0)
2976 ? getAccessibleChild(leadSelectionIndex)
2977 : null;
2978 firePropertyChange(AccessibleContext.ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY,
2979 oldLS, newLS);
2980 }
2981
2982 firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
2983 Boolean.valueOf(false), Boolean.valueOf(true));
2984 firePropertyChange(AccessibleContext.ACCESSIBLE_SELECTION_PROPERTY,
2985 Boolean.valueOf(false), Boolean.valueOf(true));
2986
2987 // Process the State changes for Multiselectable
2988 AccessibleStateSet s = getAccessibleStateSet();
2989 ListSelectionModel lsm = JList.this.getSelectionModel();
2990 if (lsm.getSelectionMode() != ListSelectionModel.SINGLE_SELECTION) {
2991 if (!s.contains(AccessibleState.MULTISELECTABLE)) {
2992 s.add(AccessibleState.MULTISELECTABLE);
2993 firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
2994 null, AccessibleState.MULTISELECTABLE);
2995 }
2996 } else {
2997 if (s.contains(AccessibleState.MULTISELECTABLE)) {
2998 s.remove(AccessibleState.MULTISELECTABLE);
2999 firePropertyChange(AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
3000 AccessibleState.MULTISELECTABLE, null);
3001 }
3002 }
3003 }
3004
3005 /**
3006 * List Data Listener interval added method. Used to fire the visible data property change
3007 *
3008 * @param e ListDataEvent
3009 *
3010 */
3011 public void intervalAdded(ListDataEvent e) {
3012 firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
3013 Boolean.valueOf(false), Boolean.valueOf(true));
3014 }
3015
3016 /**
3017 * List Data Listener interval removed method. Used to fire the visible data property change
3018 *
3019 * @param e ListDataEvent
3020 *
3021 */
3022 public void intervalRemoved(ListDataEvent e) {
3023 firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
3024 Boolean.valueOf(false), Boolean.valueOf(true));
3025 }
3026
3027 /**
3028 * List Data Listener contents changed method. Used to fire the visible data property change
3029 *
3030 * @param e ListDataEvent
3031 *
3032 */
3033 public void contentsChanged(ListDataEvent e) {
3034 firePropertyChange(AccessibleContext.ACCESSIBLE_VISIBLE_DATA_PROPERTY,
3035 Boolean.valueOf(false), Boolean.valueOf(true));
3036 }
3037
3038 // AccessibleContext methods
3039
3040 /**
3041 * Get the state set of this object.
3042 *
3043 * @return an instance of AccessibleState containing the current state
3044 * of the object
3045 * @see AccessibleState
3046 */
3047 public AccessibleStateSet getAccessibleStateSet() {
3048 AccessibleStateSet states = super.getAccessibleStateSet();
3049 if (selectionModel.getSelectionMode() !=
3050 ListSelectionModel.SINGLE_SELECTION) {
3051 states.add(AccessibleState.MULTISELECTABLE);
3052 }
3053 return states;
3054 }
3055
3056 /**
3057 * Get the role of this object.
3058 *
3059 * @return an instance of AccessibleRole describing the role of the
3060 * object
3061 * @see AccessibleRole
3062 */
3063 public AccessibleRole getAccessibleRole() {
3064 return AccessibleRole.LIST;
3065 }
3066
3067 /**
3068 * Returns the <code>Accessible</code> child contained at
3069 * the local coordinate <code>Point</code>, if one exists.
3070 * Otherwise returns <code>null</code>.
3071 *
3072 * @return the <code>Accessible</code> at the specified
3073 * location, if it exists
3074 */
3075 public Accessible getAccessibleAt(Point p) {
3076 int i = locationToIndex(p);
3077 if (i >= 0) {
3078 return new AccessibleJListChild(JList.this, i);
3079 } else {
3080 return null;
3081 }
3082 }
3083
3084 /**
3085 * Returns the number of accessible children in the object. If all
3086 * of the children of this object implement Accessible, than this
3087 * method should return the number of children of this object.
3088 *
3089 * @return the number of accessible children in the object.
3090 */
3091 public int getAccessibleChildrenCount() {
3092 return getModel().getSize();
3093 }
3094
3095 /**
3096 * Return the nth Accessible child of the object.
3097 *
3098 * @param i zero-based index of child
3099 * @return the nth Accessible child of the object
3100 */
3101 public Accessible getAccessibleChild(int i) {
3102 if (i >= getModel().getSize()) {
3103 return null;
3104 } else {
3105 return new AccessibleJListChild(JList.this, i);
3106 }
3107 }
3108
3109 /**
3110 * Get the AccessibleSelection associated with this object. In the
3111 * implementation of the Java Accessibility API for this class,
3112 * return this object, which is responsible for implementing the
3113 * AccessibleSelection interface on behalf of itself.
3114 *
3115 * @return this object
3116 */
3117 public AccessibleSelection getAccessibleSelection() {
3118 return this;
3119 }
3120
3121
3122 // AccessibleSelection methods
3123
3124 /**
3125 * Returns the number of items currently selected.
3126 * If no items are selected, the return value will be 0.
3127 *
3128 * @return the number of items currently selected.
3129 */
3130 public int getAccessibleSelectionCount() {
3131 return JList.this.getSelectedIndices().length;
3132 }
3133
3134 /**
3135 * Returns an Accessible representing the specified selected item
3136 * in the object. If there isn't a selection, or there are
3137 * fewer items selected than the integer passed in, the return
3138 * value will be <code>null</code>.
3139 *
3140 * @param i the zero-based index of selected items
3141 * @return an Accessible containing the selected item
3142 */
3143 public Accessible getAccessibleSelection(int i) {
3144 int len = getAccessibleSelectionCount();
3145 if (i < 0 || i >= len) {
3146 return null;
3147 } else {
3148 return getAccessibleChild(JList.this.getSelectedIndices()[i]);
3149 }
3150 }
3151
3152 /**
3153 * Returns true if the current child of this object is selected.
3154 *
3155 * @param i the zero-based index of the child in this Accessible
3156 * object.
3157 * @see AccessibleContext#getAccessibleChild
3158 */
3159 public boolean isAccessibleChildSelected(int i) {
3160 return isSelectedIndex(i);
3161 }
3162
3163 /**
3164 * Adds the specified selected item in the object to the object's
3165 * selection. If the object supports multiple selections,
3166 * the specified item is added to any existing selection, otherwise
3167 * it replaces any existing selection in the object. If the
3168 * specified item is already selected, this method has no effect.
3169 *
3170 * @param i the zero-based index of selectable items
3171 */
3172 public void addAccessibleSelection(int i) {
3173 JList.this.addSelectionInterval(i, i);
3174 }
3175
3176 /**
3177 * Removes the specified selected item in the object from the object's
3178 * selection. If the specified item isn't currently selected, this
3179 * method has no effect.
3180 *
3181 * @param i the zero-based index of selectable items
3182 */
3183 public void removeAccessibleSelection(int i) {
3184 JList.this.removeSelectionInterval(i, i);
3185 }
3186
3187 /**
3188 * Clears the selection in the object, so that nothing in the
3189 * object is selected.
3190 */
3191 public void clearAccessibleSelection() {
3192 JList.this.clearSelection();
3193 }
3194
3195 /**
3196 * Causes every selected item in the object to be selected
3197 * if the object supports multiple selections.
3198 */
3199 public void selectAllAccessibleSelection() {
3200 JList.this.addSelectionInterval(0, getAccessibleChildrenCount() -1);
3201 }
3202
3203 /**
3204 * This class implements accessibility support appropriate
3205 * for list children.
3206 */
3207 protected class AccessibleJListChild extends AccessibleContext
3208 implements Accessible, AccessibleComponent, AccessibleAction {
3209 private JList<E> parent = null;
3210 int indexInParent;
3211 private Component component = null;
3212 private AccessibleContext accessibleContext = null;
3213 private ListModel<E> listModel;
3214 private ListCellRenderer<? super E> cellRenderer = null;
3215
3216 /**
3217 * Constructs an {@code AccessibleJListChild}.
3218 * @param parent the parent
3219 * @param indexInParent the index in the parent
3220 */
3221 public AccessibleJListChild(JList<E> parent, int indexInParent) {
3222 this.parent = parent;
3223 this.setAccessibleParent(parent);
3224 this.indexInParent = indexInParent;
3225 if (parent != null) {
3226 listModel = parent.getModel();
3227 cellRenderer = parent.getCellRenderer();
3228 }
3229 }
3230
3231 private Component getCurrentComponent() {
3232 return getComponentAtIndex(indexInParent);
3233 }
3234
3235 AccessibleContext getCurrentAccessibleContext() {
3236 Component c = getComponentAtIndex(indexInParent);
3237 if (c instanceof Accessible) {
3238 return c.getAccessibleContext();
3239 } else {
3240 return null;
3241 }
3242 }
3243
3244 private Component getComponentAtIndex(int index) {
3245 if (index < 0 || index >= listModel.getSize()) {
3246 return null;
3247 }
3248 if ((parent != null)
3249 && (listModel != null)
3250 && cellRenderer != null) {
3251 E value = listModel.getElementAt(index);
3252 boolean isSelected = parent.isSelectedIndex(index);
3253 boolean isFocussed = parent.isFocusOwner()
3254 && (index == parent.getLeadSelectionIndex());
3255 return cellRenderer.getListCellRendererComponent(
3256 parent,
3257 value,
3258 index,
3259 isSelected,
3260 isFocussed);
3261 } else {
3262 return null;
3263 }
3264 }
3265
3266
3267 // Accessible Methods
3268 /**
3269 * Get the AccessibleContext for this object. In the
3270 * implementation of the Java Accessibility API for this class,
3271 * returns this object, which is its own AccessibleContext.
3272 *
3273 * @return this object
3274 */
3275 public AccessibleContext getAccessibleContext() {
3276 return this;
3277 }
3278
3279
3280 // AccessibleContext methods
3281
3282 public String getAccessibleName() {
3283 AccessibleContext ac = getCurrentAccessibleContext();
3284 if (ac != null) {
3285 return ac.getAccessibleName();
3286 } else {
3287 return null;
3288 }
3289 }
3290
3291 public void setAccessibleName(String s) {
3292 AccessibleContext ac = getCurrentAccessibleContext();
3293 if (ac != null) {
3294 ac.setAccessibleName(s);
3295 }
3296 }
3297
3298 public String getAccessibleDescription() {
3299 AccessibleContext ac = getCurrentAccessibleContext();
3300 if (ac != null) {
3301 return ac.getAccessibleDescription();
3302 } else {
3303 return null;
3304 }
3305 }
3306
3307 public void setAccessibleDescription(String s) {
3308 AccessibleContext ac = getCurrentAccessibleContext();
3309 if (ac != null) {
3310 ac.setAccessibleDescription(s);
3311 }
3312 }
3313
3314 public AccessibleRole getAccessibleRole() {
3315 AccessibleContext ac = getCurrentAccessibleContext();
3316 if (ac != null) {
3317 return ac.getAccessibleRole();
3318 } else {
3319 return null;
3320 }
3321 }
3322
3323 public AccessibleStateSet getAccessibleStateSet() {
3324 AccessibleContext ac = getCurrentAccessibleContext();
3325 AccessibleStateSet s;
3326 if (ac != null) {
3327 s = ac.getAccessibleStateSet();
3328 } else {
3329 s = new AccessibleStateSet();
3330 }
3331
3332 s.add(AccessibleState.SELECTABLE);
3333 if (parent.isFocusOwner()
3334 && (indexInParent == parent.getLeadSelectionIndex())) {
3335 s.add(AccessibleState.ACTIVE);
3336 }
3337 if (parent.isSelectedIndex(indexInParent)) {
3338 s.add(AccessibleState.SELECTED);
3339 }
3340 if (this.isShowing()) {
3341 s.add(AccessibleState.SHOWING);
3342 } else if (s.contains(AccessibleState.SHOWING)) {
3343 s.remove(AccessibleState.SHOWING);
3344 }
3345 if (this.isVisible()) {
3346 s.add(AccessibleState.VISIBLE);
3347 } else if (s.contains(AccessibleState.VISIBLE)) {
3348 s.remove(AccessibleState.VISIBLE);
3349 }
3350 s.add(AccessibleState.TRANSIENT); // cell-rendered
3351 return s;
3352 }
3353
3354 public int getAccessibleIndexInParent() {
3355 return indexInParent;
3356 }
3357
3358 public int getAccessibleChildrenCount() {
3359 AccessibleContext ac = getCurrentAccessibleContext();
3360 if (ac != null) {
3361 return ac.getAccessibleChildrenCount();
3362 } else {
3363 return 0;
3364 }
3365 }
3366
3367 public Accessible getAccessibleChild(int i) {
3368 AccessibleContext ac = getCurrentAccessibleContext();
3369 if (ac != null) {
3370 Accessible accessibleChild = ac.getAccessibleChild(i);
3371 ac.setAccessibleParent(this);
3372 return accessibleChild;
3373 } else {
3374 return null;
3375 }
3376 }
3377
3378 public Locale getLocale() {
3379 AccessibleContext ac = getCurrentAccessibleContext();
3380 if (ac != null) {
3381 return ac.getLocale();
3382 } else {
3383 return null;
3384 }
3385 }
3386
3387 public void addPropertyChangeListener(PropertyChangeListener l) {
3388 AccessibleContext ac = getCurrentAccessibleContext();
3389 if (ac != null) {
3390 ac.addPropertyChangeListener(l);
3391 }
3392 }
3393
3394 public void removePropertyChangeListener(PropertyChangeListener l) {
3395 AccessibleContext ac = getCurrentAccessibleContext();
3396 if (ac != null) {
3397 ac.removePropertyChangeListener(l);
3398 }
3399 }
3400
3401 /**
3402 * Get the AccessibleComponent associated with this object. In the
3403 * implementation of the Java Accessibility API for this class,
3404 * return this object, which is responsible for implementing the
3405 * AccessibleComponent interface on behalf of itself.
3406 *
3407 * @return this object
3408 */
3409 public AccessibleComponent getAccessibleComponent() {
3410 return this; // to override getBounds()
3411 }
3412
3413 public AccessibleSelection getAccessibleSelection() {
3414 AccessibleContext ac = getCurrentAccessibleContext();
3415 return ac != null ? ac.getAccessibleSelection() : null;
3416 }
3417
3418 public AccessibleText getAccessibleText() {
3419 AccessibleContext ac = getCurrentAccessibleContext();
3420 return ac != null ? ac.getAccessibleText() : null;
3421 }
3422
3423 public AccessibleValue getAccessibleValue() {
3424 AccessibleContext ac = getCurrentAccessibleContext();
3425 return ac != null ? ac.getAccessibleValue() : null;
3426 }
3427
3428
3429 // AccessibleComponent methods
3430
3431 public Color getBackground() {
3432 AccessibleContext ac = getCurrentAccessibleContext();
3433 if (ac instanceof AccessibleComponent) {
3434 return ((AccessibleComponent) ac).getBackground();
3435 } else {
3436 Component c = getCurrentComponent();
3437 if (c != null) {
3438 return c.getBackground();
3439 } else {
3440 return null;
3441 }
3442 }
3443 }
3444
3445 public void setBackground(Color c) {
3446 AccessibleContext ac = getCurrentAccessibleContext();
3447 if (ac instanceof AccessibleComponent) {
3448 ((AccessibleComponent) ac).setBackground(c);
3449 } else {
3450 Component cp = getCurrentComponent();
3451 if (cp != null) {
3452 cp.setBackground(c);
3453 }
3454 }
3455 }
3456
3457 public Color getForeground() {
3458 AccessibleContext ac = getCurrentAccessibleContext();
3459 if (ac instanceof AccessibleComponent) {
3460 return ((AccessibleComponent) ac).getForeground();
3461 } else {
3462 Component c = getCurrentComponent();
3463 if (c != null) {
3464 return c.getForeground();
3465 } else {
3466 return null;
3467 }
3468 }
3469 }
3470
3471 public void setForeground(Color c) {
3472 AccessibleContext ac = getCurrentAccessibleContext();
3473 if (ac instanceof AccessibleComponent) {
3474 ((AccessibleComponent) ac).setForeground(c);
3475 } else {
3476 Component cp = getCurrentComponent();
3477 if (cp != null) {
3478 cp.setForeground(c);
3479 }
3480 }
3481 }
3482
3483 public Cursor getCursor() {
3484 AccessibleContext ac = getCurrentAccessibleContext();
3485 if (ac instanceof AccessibleComponent) {
3486 return ((AccessibleComponent) ac).getCursor();
3487 } else {
3488 Component c = getCurrentComponent();
3489 if (c != null) {
3490 return c.getCursor();
3491 } else {
3492 Accessible ap = getAccessibleParent();
3493 if (ap instanceof AccessibleComponent) {
3494 return ((AccessibleComponent) ap).getCursor();
3495 } else {
3496 return null;
3497 }
3498 }
3499 }
3500 }
3501
3502 public void setCursor(Cursor c) {
3503 AccessibleContext ac = getCurrentAccessibleContext();
3504 if (ac instanceof AccessibleComponent) {
3505 ((AccessibleComponent) ac).setCursor(c);
3506 } else {
3507 Component cp = getCurrentComponent();
3508 if (cp != null) {
3509 cp.setCursor(c);
3510 }
3511 }
3512 }
3513
3514 public Font getFont() {
3515 AccessibleContext ac = getCurrentAccessibleContext();
3516 if (ac instanceof AccessibleComponent) {
3517 return ((AccessibleComponent) ac).getFont();
3518 } else {
3519 Component c = getCurrentComponent();
3520 if (c != null) {
3521 return c.getFont();
3522 } else {
3523 return null;
3524 }
3525 }
3526 }
3527
3528 public void setFont(Font f) {
3529 AccessibleContext ac = getCurrentAccessibleContext();
3530 if (ac instanceof AccessibleComponent) {
3531 ((AccessibleComponent) ac).setFont(f);
3532 } else {
3533 Component c = getCurrentComponent();
3534 if (c != null) {
3535 c.setFont(f);
3536 }
3537 }
3538 }
3539
3540 public FontMetrics getFontMetrics(Font f) {
3541 AccessibleContext ac = getCurrentAccessibleContext();
3542 if (ac instanceof AccessibleComponent) {
3543 return ((AccessibleComponent) ac).getFontMetrics(f);
3544 } else {
3545 Component c = getCurrentComponent();
3546 if (c != null) {
3547 return c.getFontMetrics(f);
3548 } else {
3549 return null;
3550 }
3551 }
3552 }
3553
3554 public boolean isEnabled() {
3555 AccessibleContext ac = getCurrentAccessibleContext();
3556 if (ac instanceof AccessibleComponent) {
3557 return ((AccessibleComponent) ac).isEnabled();
3558 } else {
3559 Component c = getCurrentComponent();
3560 if (c != null) {
3561 return c.isEnabled();
3562 } else {
3563 return false;
3564 }
3565 }
3566 }
3567
3568 public void setEnabled(boolean b) {
3569 AccessibleContext ac = getCurrentAccessibleContext();
3570 if (ac instanceof AccessibleComponent) {
3571 ((AccessibleComponent) ac).setEnabled(b);
3572 } else {
3573 Component c = getCurrentComponent();
3574 if (c != null) {
3575 c.setEnabled(b);
3576 }
3577 }
3578 }
3579
3580 public boolean isVisible() {
3581 int fi = parent.getFirstVisibleIndex();
3582 int li = parent.getLastVisibleIndex();
3583 // The UI incorrectly returns a -1 for the last
3584 // visible index if the list is smaller than the
3585 // viewport size.
3586 if (li == -1) {
3587 li = parent.getModel().getSize() - 1;
3588 }
3589 return ((indexInParent >= fi)
3590 && (indexInParent <= li));
3591 }
3592
3593 public void setVisible(boolean b) {
3594 }
3595
3596 public boolean isShowing() {
3597 return (parent.isShowing() && isVisible());
3598 }
3599
3600 public boolean contains(Point p) {
3601 AccessibleContext ac = getCurrentAccessibleContext();
3602 if (ac instanceof AccessibleComponent) {
3603 Rectangle r = ((AccessibleComponent) ac).getBounds();
3604 return r.contains(p);
3605 } else {
3606 Component c = getCurrentComponent();
3607 if (c != null) {
3608 Rectangle r = c.getBounds();
3609 return r.contains(p);
3610 } else {
3611 return getBounds().contains(p);
3612 }
3613 }
3614 }
3615
3616 public Point getLocationOnScreen() {
3617 if (parent != null) {
3618 Point listLocation;
3619 try {
3620 listLocation = parent.getLocationOnScreen();
3621 } catch (IllegalComponentStateException e) {
3622 // This can happen if the component isn't visisble
3623 return null;
3624 }
3625 Point componentLocation = parent.indexToLocation(indexInParent);
3626 if (componentLocation != null) {
3627 componentLocation.translate(listLocation.x, listLocation.y);
3628 return componentLocation;
3629 } else {
3630 return null;
3631 }
3632 } else {
3633 return null;
3634 }
3635 }
3636
3637 public Point getLocation() {
3638 if (parent != null) {
3639 return parent.indexToLocation(indexInParent);
3640 } else {
3641 return null;
3642 }
3643 }
3644
3645 public void setLocation(Point p) {
3646 if ((parent != null) && (parent.contains(p))) {
3647 ensureIndexIsVisible(indexInParent);
3648 }
3649 }
3650
3651 public Rectangle getBounds() {
3652 if (parent != null) {
3653 return parent.getCellBounds(indexInParent,indexInParent);
3654 } else {
3655 return null;
3656 }
3657 }
3658
3659 public void setBounds(Rectangle r) {
3660 AccessibleContext ac = getCurrentAccessibleContext();
3661 if (ac instanceof AccessibleComponent) {
3662 ((AccessibleComponent) ac).setBounds(r);
3663 }
3664 }
3665
3666 public Dimension getSize() {
3667 Rectangle cellBounds = this.getBounds();
3668 if (cellBounds != null) {
3669 return cellBounds.getSize();
3670 } else {
3671 return null;
3672 }
3673 }
3674
3675 public void setSize (Dimension d) {
3676 AccessibleContext ac = getCurrentAccessibleContext();
3677 if (ac instanceof AccessibleComponent) {
3678 ((AccessibleComponent) ac).setSize(d);
3679 } else {
3680 Component c = getCurrentComponent();
3681 if (c != null) {
3682 c.setSize(d);
3683 }
3684 }
3685 }
3686
3687 public Accessible getAccessibleAt(Point p) {
3688 AccessibleContext ac = getCurrentAccessibleContext();
3689 if (ac instanceof AccessibleComponent) {
3690 return ((AccessibleComponent) ac).getAccessibleAt(p);
3691 } else {
3692 return null;
3693 }
3694 }
3695
3696 @SuppressWarnings("deprecation")
3697 public boolean isFocusTraversable() {
3698 AccessibleContext ac = getCurrentAccessibleContext();
3699 if (ac instanceof AccessibleComponent) {
3700 return ((AccessibleComponent) ac).isFocusTraversable();
3701 } else {
3702 Component c = getCurrentComponent();
3703 if (c != null) {
3704 return c.isFocusTraversable();
3705 } else {
3706 return false;
3707 }
3708 }
3709 }
3710
3711 public void requestFocus() {
3712 AccessibleContext ac = getCurrentAccessibleContext();
3713 if (ac instanceof AccessibleComponent) {
3714 ((AccessibleComponent) ac).requestFocus();
3715 } else {
3716 Component c = getCurrentComponent();
3717 if (c != null) {
3718 c.requestFocus();
3719 }
3720 }
3721 }
3722
3723 public void addFocusListener(FocusListener l) {
3724 AccessibleContext ac = getCurrentAccessibleContext();
3725 if (ac instanceof AccessibleComponent) {
3726 ((AccessibleComponent) ac).addFocusListener(l);
3727 } else {
3728 Component c = getCurrentComponent();
3729 if (c != null) {
3730 c.addFocusListener(l);
3731 }
3732 }
3733 }
3734
3735 public void removeFocusListener(FocusListener l) {
3736 AccessibleContext ac = getCurrentAccessibleContext();
3737 if (ac instanceof AccessibleComponent) {
3738 ((AccessibleComponent) ac).removeFocusListener(l);
3739 } else {
3740 Component c = getCurrentComponent();
3741 if (c != null) {
3742 c.removeFocusListener(l);
3743 }
3744 }
3745 }
3746
3747 // TIGER - 4733624
3748 /**
3749 * Returns the icon for the element renderer, as the only item
3750 * of an array of <code>AccessibleIcon</code>s or a <code>null</code> array
3751 * if the renderer component contains no icons.
3752 *
3753 * @return an array containing the accessible icon
3754 * or a <code>null</code> array if none
3755 * @since 1.3
3756 */
3757 public AccessibleIcon [] getAccessibleIcon() {
3758 AccessibleContext ac = getCurrentAccessibleContext();
3759 if (ac != null) {
3760 return ac.getAccessibleIcon();
3761 } else {
3762 return null;
3763 }
3764 }
3765
3766 /**
3767 * {@inheritDoc}
3768 * @implSpec Returns the AccessibleAction for this AccessibleJListChild
3769 * as follows: First getListCellRendererComponent of the ListCellRenderer
3770 * for the component at the "index in parent" of this child is called.
3771 * Then its AccessibleContext is fetched and that AccessibleContext's
3772 * AccessibleAction is returned. Note that if an AccessibleAction
3773 * is not found using this process then this object with its implementation
3774 * of the AccessibleAction interface is returned.
3775 * @since 9
3776 */
3777 @Override
3778 public AccessibleAction getAccessibleAction() {
3779 AccessibleContext ac = getCurrentAccessibleContext();
3780 if (ac == null) {
3781 return null;
3782 } else {
3783 AccessibleAction aa = ac.getAccessibleAction();
3784 if (aa != null) {
3785 return aa;
3786 } else {
3787 return this;
3788 }
3789 }
3790 }
3791
3792 /**
3793 * {@inheritDoc}
3794 * @implSpec If i == 0 selects this AccessibleJListChild by calling
3795 * JList.this.setSelectedIndex(indexInParent) and then returns true;
3796 * otherwise returns false.
3797 * @since 9
3798 */
3799 @Override
3800 public boolean doAccessibleAction(int i) {
3801 if (i == 0) {
3802 JList.this.setSelectedIndex(indexInParent);
3803 return true;
3804 } else {
3805 return false;
3806 }
3807 }
3808
3809 /**
3810 * {@inheritDoc}
3811 * @implSpec If i == 0 returns the action description fetched from
3812 * UIManager.getString("AbstractButton.clickText");
3813 * otherwise returns null.
3814 * @since 9
3815 */
3816 @Override
3817 public String getAccessibleActionDescription(int i) {
3818 if (i == 0) {
3819 return UIManager.getString("AbstractButton.clickText");
3820 } else {
3821 return null;
3822 }
3823 }
3824
3825 /**
3826 * {@inheritDoc}
3827 * @implSpec Returns 1, i.e. there is only one action.
3828 * @since 9
3829 */
3830 @Override
3831 public int getAccessibleActionCount() {
3832 return 1;
3833 }
3834
3835 } // inner class AccessibleJListChild
3836
3837 } // inner class AccessibleJList
3838 }