1 /*
2 * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25 package javax.swing;
26
27 import java.applet.Applet;
28 import java.awt.*;
29 import java.awt.event.*;
30 import java.beans.*;
31 import java.security.AccessController;
32 import javax.accessibility.*;
33 import javax.swing.plaf.RootPaneUI;
34 import java.util.Vector;
35 import java.io.Serializable;
36 import javax.swing.border.*;
37
38 import sun.awt.AWTAccessor;
39 import sun.security.action.GetBooleanAction;
40
41
42 /**
43 * A lightweight container used behind the scenes by
44 * <code>JFrame</code>, <code>JDialog</code>, <code>JWindow</code>,
45 * <code>JApplet</code>, and <code>JInternalFrame</code>.
46 * For task-oriented information on functionality provided by root panes
47 * see <a href="https://docs.oracle.com/javase/tutorial/uiswing/components/rootpane.html">How to Use Root Panes</a>,
48 * a section in <em>The Java Tutorial</em>.
49 *
50 * <p>
51 * The following image shows the relationships between
52 * the classes that use root panes.
53 * <p style="text-align:center"><img src="doc-files/JRootPane-1.gif"
54 * alt="The following text describes this graphic."
55 * HEIGHT=484 WIDTH=629></p>
56 * The "heavyweight" components (those that delegate to a peer, or native
57 * component on the host system) are shown with a darker, heavier box. The four
58 * heavyweight JFC/Swing containers (<code>JFrame</code>, <code>JDialog</code>,
59 * <code>JWindow</code>, and <code>JApplet</code>) are
60 * shown in relation to the AWT classes they extend.
61 * These four components are the
62 * only heavyweight containers in the Swing library. The lightweight container
63 * <code>JInternalFrame</code> is also shown.
64 * All five of these JFC/Swing containers implement the
65 * <code>RootPaneContainer</code> interface,
66 * and they all delegate their operations to a
67 * <code>JRootPane</code> (shown with a little "handle" on top).
68 * <blockquote>
69 * <b>Note:</b> The <code>JComponent</code> method <code>getRootPane</code>
70 * can be used to obtain the <code>JRootPane</code> that contains
71 * a given component.
72 * </blockquote>
73 *
74 * <div style="float:right;text-align:center;font-weight:bold">
75 * <p>Example:
76 * <p><img src="doc-files/JRootPane-2.gif"
77 * alt="the following text describes this graphic." height=386 width=349>
78 * </div>
79 * The diagram at right shows the structure of a <code>JRootPane</code>.
80 * A <code>JRootpane</code> is made up of a <code>glassPane</code>,
81 * an optional <code>menuBar</code>, and a <code>contentPane</code>.
82 * (The <code>JLayeredPane</code> manages the <code>menuBar</code>
83 * and the <code>contentPane</code>.)
84 * The <code>glassPane</code> sits over the top of everything,
85 * where it is in a position to intercept mouse movements.
86 * Since the <code>glassPane</code> (like the <code>contentPane</code>)
87 * can be an arbitrary component, it is also possible to set up the
88 * <code>glassPane</code> for drawing. Lines and images on the
89 * <code>glassPane</code> can then range
90 * over the frames underneath without being limited by their boundaries.
91 * <p>
92 * Although the <code>menuBar</code> component is optional,
93 * the <code>layeredPane</code>, <code>contentPane</code>,
94 * and <code>glassPane</code> always exist.
95 * Attempting to set them to <code>null</code> generates an exception.
96 * <p>
97 * To add components to the <code>JRootPane</code> (other than the
98 * optional menu bar), you add the object to the <code>contentPane</code>
99 * of the <code>JRootPane</code>, like this:
100 * <pre>
101 * rootPane.getContentPane().add(child);
102 * </pre>
103 * The same principle holds true for setting layout managers, removing
104 * components, listing children, etc. All these methods are invoked on
105 * the <code>contentPane</code> instead of on the <code>JRootPane</code>.
106 * <blockquote>
107 * <b>Note:</b> The default layout manager for the <code>contentPane</code> is
108 * a <code>BorderLayout</code> manager. However, the <code>JRootPane</code>
109 * uses a custom <code>LayoutManager</code>.
110 * So, when you want to change the layout manager for the components you added
111 * to a <code>JRootPane</code>, be sure to use code like this:
112 * <pre>
113 * rootPane.getContentPane().setLayout(new BoxLayout());
114 * </pre></blockquote>
115 * If a <code>JMenuBar</code> component is set on the <code>JRootPane</code>,
116 * it is positioned along the upper edge of the frame.
117 * The <code>contentPane</code> is adjusted in location and size to
118 * fill the remaining area.
119 * (The <code>JMenuBar</code> and the <code>contentPane</code> are added to the
120 * <code>layeredPane</code> component at the
121 * <code>JLayeredPane.FRAME_CONTENT_LAYER</code> layer.)
122 * <p>
123 * The <code>layeredPane</code> is the parent of all children in the
124 * <code>JRootPane</code> -- both as the direct parent of the menu and
125 * the grandparent of all components added to the <code>contentPane</code>.
126 * It is an instance of <code>JLayeredPane</code>,
127 * which provides the ability to add components at several layers.
128 * This capability is very useful when working with menu popups,
129 * dialog boxes, and dragging -- situations in which you need to place
130 * a component on top of all other components in the pane.
131 * <p>
132 * The <code>glassPane</code> sits on top of all other components in the
133 * <code>JRootPane</code>.
134 * That provides a convenient place to draw above all other components,
135 * and makes it possible to intercept mouse events,
136 * which is useful both for dragging and for drawing.
137 * Developers can use <code>setVisible</code> on the <code>glassPane</code>
138 * to control when the <code>glassPane</code> displays over the other children.
139 * By default the <code>glassPane</code> is not visible.
140 * <p>
141 * The custom <code>LayoutManager</code> used by <code>JRootPane</code>
142 * ensures that:
143 * <OL>
144 * <LI>The <code>glassPane</code> fills the entire viewable
145 * area of the <code>JRootPane</code> (bounds - insets).
146 * <LI>The <code>layeredPane</code> fills the entire viewable area of the
147 * <code>JRootPane</code>. (bounds - insets)
148 * <LI>The <code>menuBar</code> is positioned at the upper edge of the
149 * <code>layeredPane</code>.
150 * <LI>The <code>contentPane</code> fills the entire viewable area,
151 * minus the <code>menuBar</code>, if present.
152 * </OL>
153 * Any other views in the <code>JRootPane</code> view hierarchy are ignored.
154 * <p>
155 * If you replace the <code>LayoutManager</code> of the <code>JRootPane</code>,
156 * you are responsible for managing all of these views.
157 * So ordinarily you will want to be sure that you
158 * change the layout manager for the <code>contentPane</code> rather than
159 * for the <code>JRootPane</code> itself!
160 * <p>
161 * The painting architecture of Swing requires an opaque
162 * <code>JComponent</code>
163 * to exist in the containment hierarchy above all other components. This is
164 * typically provided by way of the content pane. If you replace the content
165 * pane, it is recommended that you make the content pane opaque
166 * by way of <code>setOpaque(true)</code>. Additionally, if the content pane
167 * overrides <code>paintComponent</code>, it
168 * will need to completely fill in the background in an opaque color in
169 * <code>paintComponent</code>.
170 * <p>
171 * <strong>Warning:</strong> Swing is not thread safe. For more
172 * information see <a
173 * href="package-summary.html#threading">Swing's Threading
174 * Policy</a>.
175 * <p>
176 * <strong>Warning:</strong>
177 * Serialized objects of this class will not be compatible with
178 * future Swing releases. The current serialization support is
179 * appropriate for short term storage or RMI between applications running
180 * the same version of Swing. As of 1.4, support for long term storage
181 * of all JavaBeans
182 * has been added to the <code>java.beans</code> package.
183 * Please see {@link java.beans.XMLEncoder}.
184 *
185 * @see JLayeredPane
186 * @see JMenuBar
187 * @see JWindow
188 * @see JFrame
189 * @see JDialog
190 * @see JApplet
191 * @see JInternalFrame
192 * @see JComponent
193 * @see BoxLayout
194 *
195 * @see <a href="http://www.oracle.com/technetwork/articles/java/mixing-components-433992.html">
196 * Mixing Heavy and Light Components</a>
197 *
198 * @author David Kloba
199 * @since 1.2
200 */
201 /// PENDING(klobad) Who should be opaque in this component?
202 @SuppressWarnings("serial")
203 public class JRootPane extends JComponent implements Accessible {
204
205 private static final String uiClassID = "RootPaneUI";
206
207 /**
208 * Whether or not we should dump the stack when true double buffering
209 * is disabled. Default is false.
210 */
211 private static final boolean LOG_DISABLE_TRUE_DOUBLE_BUFFERING;
212
213 /**
214 * Whether or not we should ignore requests to disable true double
215 * buffering. Default is false.
216 */
217 private static final boolean IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING;
218
219 /**
220 * Constant used for the windowDecorationStyle property. Indicates that
221 * the <code>JRootPane</code> should not provide any sort of
222 * Window decorations.
223 *
224 * @since 1.4
225 */
226 public static final int NONE = 0;
227
228 /**
229 * Constant used for the windowDecorationStyle property. Indicates that
230 * the <code>JRootPane</code> should provide decorations appropriate for
231 * a Frame.
232 *
233 * @since 1.4
234 */
235 public static final int FRAME = 1;
236
237 /**
238 * Constant used for the windowDecorationStyle property. Indicates that
239 * the <code>JRootPane</code> should provide decorations appropriate for
240 * a Dialog.
241 *
242 * @since 1.4
243 */
244 public static final int PLAIN_DIALOG = 2;
245
246 /**
247 * Constant used for the windowDecorationStyle property. Indicates that
248 * the <code>JRootPane</code> should provide decorations appropriate for
249 * a Dialog used to display an informational message.
250 *
251 * @since 1.4
252 */
253 public static final int INFORMATION_DIALOG = 3;
254
255 /**
256 * Constant used for the windowDecorationStyle property. Indicates that
257 * the <code>JRootPane</code> should provide decorations appropriate for
258 * a Dialog used to display an error message.
259 *
260 * @since 1.4
261 */
262 public static final int ERROR_DIALOG = 4;
263
264 /**
265 * Constant used for the windowDecorationStyle property. Indicates that
266 * the <code>JRootPane</code> should provide decorations appropriate for
267 * a Dialog used to display a <code>JColorChooser</code>.
268 *
269 * @since 1.4
270 */
271 public static final int COLOR_CHOOSER_DIALOG = 5;
272
273 /**
274 * Constant used for the windowDecorationStyle property. Indicates that
275 * the <code>JRootPane</code> should provide decorations appropriate for
276 * a Dialog used to display a <code>JFileChooser</code>.
277 *
278 * @since 1.4
279 */
280 public static final int FILE_CHOOSER_DIALOG = 6;
281
282 /**
283 * Constant used for the windowDecorationStyle property. Indicates that
284 * the <code>JRootPane</code> should provide decorations appropriate for
285 * a Dialog used to present a question to the user.
286 *
287 * @since 1.4
288 */
289 public static final int QUESTION_DIALOG = 7;
290
291 /**
292 * Constant used for the windowDecorationStyle property. Indicates that
293 * the <code>JRootPane</code> should provide decorations appropriate for
294 * a Dialog used to display a warning message.
295 *
296 * @since 1.4
297 */
298 public static final int WARNING_DIALOG = 8;
299
300 private int windowDecorationStyle;
301
302 /** The menu bar. */
303 protected JMenuBar menuBar;
304
305 /** The content pane. */
306 protected Container contentPane;
307
308 /** The layered pane that manages the menu bar and content pane. */
309 protected JLayeredPane layeredPane;
310
311 /**
312 * The glass pane that overlays the menu bar and content pane,
313 * so it can intercept mouse movements and such.
314 */
315 protected Component glassPane;
316 /**
317 * The button that gets activated when the pane has the focus and
318 * a UI-specific action like pressing the <b>Enter</b> key occurs.
319 */
320 protected JButton defaultButton;
321
322 /**
323 * Whether or not true double buffering should be used. This is typically
324 * true, but may be set to false in special situations. For example,
325 * heavy weight popups (backed by a window) set this to false.
326 */
327 boolean useTrueDoubleBuffering = true;
328
329 static {
330 LOG_DISABLE_TRUE_DOUBLE_BUFFERING =
331 AccessController.doPrivileged(new GetBooleanAction(
332 "swing.logDoubleBufferingDisable"));
333 IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING =
334 AccessController.doPrivileged(new GetBooleanAction(
335 "swing.ignoreDoubleBufferingDisable"));
336 }
337
338 /**
339 * Creates a <code>JRootPane</code>, setting up its
340 * <code>glassPane</code>, <code>layeredPane</code>,
341 * and <code>contentPane</code>.
342 */
343 public JRootPane() {
344 setGlassPane(createGlassPane());
345 setLayeredPane(createLayeredPane());
346 setContentPane(createContentPane());
347 setLayout(createRootLayout());
348 setDoubleBuffered(true);
349 updateUI();
350 }
351
352 /**
353 * {@inheritDoc}
354 * @since 1.6
355 */
356 public void setDoubleBuffered(boolean aFlag) {
357 if (isDoubleBuffered() != aFlag) {
358 super.setDoubleBuffered(aFlag);
359 RepaintManager.currentManager(this).doubleBufferingChanged(this);
360 }
361 }
362
363 /**
364 * Returns a constant identifying the type of Window decorations the
365 * <code>JRootPane</code> is providing.
366 *
367 * @return One of <code>NONE</code>, <code>FRAME</code>,
368 * <code>PLAIN_DIALOG</code>, <code>INFORMATION_DIALOG</code>,
369 * <code>ERROR_DIALOG</code>, <code>COLOR_CHOOSER_DIALOG</code>,
370 * <code>FILE_CHOOSER_DIALOG</code>, <code>QUESTION_DIALOG</code> or
371 * <code>WARNING_DIALOG</code>.
372 * @see #setWindowDecorationStyle
373 * @since 1.4
374 */
375 public int getWindowDecorationStyle() {
376 return windowDecorationStyle;
377 }
378
379 /**
380 * Sets the type of Window decorations (such as borders, widgets for
381 * closing a Window, title ...) the <code>JRootPane</code> should
382 * provide. The default is to provide no Window decorations
383 * (<code>NONE</code>).
384 * <p>
385 * This is only a hint, and some look and feels may not support
386 * this.
387 * This is a bound property.
388 *
389 * @param windowDecorationStyle Constant identifying Window decorations
390 * to provide.
391 * @see JDialog#setDefaultLookAndFeelDecorated
392 * @see JFrame#setDefaultLookAndFeelDecorated
393 * @see LookAndFeel#getSupportsWindowDecorations
394 * @throws IllegalArgumentException if <code>style</code> is
395 * not one of: <code>NONE</code>, <code>FRAME</code>,
396 * <code>PLAIN_DIALOG</code>, <code>INFORMATION_DIALOG</code>,
397 * <code>ERROR_DIALOG</code>, <code>COLOR_CHOOSER_DIALOG</code>,
398 * <code>FILE_CHOOSER_DIALOG</code>, <code>QUESTION_DIALOG</code>, or
399 * <code>WARNING_DIALOG</code>.
400 * @since 1.4
401 */
402 @BeanProperty(expert = true, visualUpdate = true, enumerationValues = {
403 "JRootPane.NONE",
404 "JRootPane.FRAME",
405 "JRootPane.PLAIN_DIALOG",
406 "JRootPane.INFORMATION_DIALOG",
407 "JRootPane.ERROR_DIALOG",
408 "JRootPane.COLOR_CHOOSER_DIALOG",
409 "JRootPane.FILE_CHOOSER_DIALOG",
410 "JRootPane.QUESTION_DIALOG",
411 "JRootPane.WARNING_DIALOG"}, description
412 = "Identifies the type of Window decorations to provide")
413 public void setWindowDecorationStyle(int windowDecorationStyle) {
414 if (windowDecorationStyle < 0 ||
415 windowDecorationStyle > WARNING_DIALOG) {
416 throw new IllegalArgumentException("Invalid decoration style");
417 }
418 int oldWindowDecorationStyle = getWindowDecorationStyle();
419 this.windowDecorationStyle = windowDecorationStyle;
420 firePropertyChange("windowDecorationStyle",
421 oldWindowDecorationStyle,
422 windowDecorationStyle);
423 }
424
425 /**
426 * Returns the L&F object that renders this component.
427 *
428 * @return <code>LabelUI</code> object
429 * @since 1.3
430 */
431 public RootPaneUI getUI() {
432 return (RootPaneUI)ui;
433 }
434
435 /**
436 * Sets the L&F object that renders this component.
437 *
438 * @param ui the <code>LabelUI</code> L&F object
439 * @see UIDefaults#getUI
440 * @since 1.3
441 */
442 @BeanProperty(expert = true, hidden = true, visualUpdate = true, description
443 = "The UI object that implements the Component's LookAndFeel.")
444 public void setUI(RootPaneUI ui) {
445 super.setUI(ui);
446 }
447
448
449 /**
450 * Resets the UI property to a value from the current look and feel.
451 *
452 * @see JComponent#updateUI
453 */
454 public void updateUI() {
455 setUI((RootPaneUI)UIManager.getUI(this));
456 }
457
458
459 /**
460 * Returns a string that specifies the name of the L&F class
461 * that renders this component.
462 *
463 * @return the string "RootPaneUI"
464 *
465 * @see JComponent#getUIClassID
466 * @see UIDefaults#getUI
467 */
468 public String getUIClassID() {
469 return uiClassID;
470 }
471
472 /**
473 * Called by the constructor methods to create the default
474 * <code>layeredPane</code>.
475 * Bt default it creates a new <code>JLayeredPane</code>.
476 * @return the default <code>layeredPane</code>
477 */
478 protected JLayeredPane createLayeredPane() {
479 JLayeredPane p = new JLayeredPane();
480 p.setName(this.getName()+".layeredPane");
481 return p;
482 }
483
484 /**
485 * Called by the constructor methods to create the default
486 * <code>contentPane</code>.
487 * By default this method creates a new <code>JComponent</code> add sets a
488 * <code>BorderLayout</code> as its <code>LayoutManager</code>.
489 * @return the default <code>contentPane</code>
490 */
491 protected Container createContentPane() {
492 JComponent c = new JPanel();
493 c.setName(this.getName()+".contentPane");
494 c.setLayout(new BorderLayout() {
495 /* This BorderLayout subclass maps a null constraint to CENTER.
496 * Although the reference BorderLayout also does this, some VMs
497 * throw an IllegalArgumentException.
498 */
499 public void addLayoutComponent(Component comp, Object constraints) {
500 if (constraints == null) {
501 constraints = BorderLayout.CENTER;
502 }
503 super.addLayoutComponent(comp, constraints);
504 }
505 });
506 return c;
507 }
508
509 /**
510 * Called by the constructor methods to create the default
511 * <code>glassPane</code>.
512 * By default this method creates a new <code>JComponent</code>
513 * with visibility set to false.
514 * @return the default <code>glassPane</code>
515 */
516 protected Component createGlassPane() {
517 JComponent c = new JPanel();
518 c.setName(this.getName()+".glassPane");
519 c.setVisible(false);
520 ((JPanel)c).setOpaque(false);
521 return c;
522 }
523
524 /**
525 * Called by the constructor methods to create the default
526 * <code>layoutManager</code>.
527 * @return the default <code>layoutManager</code>.
528 */
529 protected LayoutManager createRootLayout() {
530 return new RootLayout();
531 }
532
533 /**
534 * Adds or changes the menu bar used in the layered pane.
535 * @param menu the <code>JMenuBar</code> to add
536 */
537 public void setJMenuBar(JMenuBar menu) {
538 if(menuBar != null && menuBar.getParent() == layeredPane)
539 layeredPane.remove(menuBar);
540 menuBar = menu;
541
542 if(menuBar != null) {
543 menuBar.updateUI();
544 layeredPane.add(menuBar, JLayeredPane.FRAME_CONTENT_LAYER);
545 }
546 }
547
548 /**
549 * Specifies the menu bar value.
550 * @deprecated As of Swing version 1.0.3
551 * replaced by <code>setJMenuBar(JMenuBar menu)</code>.
552 * @param menu the <code>JMenuBar</code> to add.
553 */
554 @Deprecated
555 public void setMenuBar(JMenuBar menu){
556 if(menuBar != null && menuBar.getParent() == layeredPane)
557 layeredPane.remove(menuBar);
558 menuBar = menu;
559
560 if(menuBar != null)
561 layeredPane.add(menuBar, JLayeredPane.FRAME_CONTENT_LAYER);
562 }
563
564 /**
565 * Returns the menu bar from the layered pane.
566 * @return the <code>JMenuBar</code> used in the pane
567 */
568 public JMenuBar getJMenuBar() { return menuBar; }
569
570 /**
571 * Returns the menu bar value.
572 * @deprecated As of Swing version 1.0.3
573 * replaced by <code>getJMenuBar()</code>.
574 * @return the <code>JMenuBar</code> used in the pane
575 */
576 @Deprecated
577 public JMenuBar getMenuBar() { return menuBar; }
578
579 /**
580 * Sets the content pane -- the container that holds the components
581 * parented by the root pane.
582 * <p>
583 * Swing's painting architecture requires an opaque <code>JComponent</code>
584 * in the containment hierarchy. This is typically provided by the
585 * content pane. If you replace the content pane it is recommended you
586 * replace it with an opaque <code>JComponent</code>.
587 *
588 * @param content the <code>Container</code> to use for component-contents
589 * @exception java.awt.IllegalComponentStateException (a runtime
590 * exception) if the content pane parameter is <code>null</code>
591 */
592 public void setContentPane(Container content) {
593 if(content == null)
594 throw new IllegalComponentStateException("contentPane cannot be set to null.");
595 if(contentPane != null && contentPane.getParent() == layeredPane)
596 layeredPane.remove(contentPane);
597 contentPane = content;
598
599 layeredPane.add(contentPane, JLayeredPane.FRAME_CONTENT_LAYER);
600 }
601
602 /**
603 * Returns the content pane -- the container that holds the components
604 * parented by the root pane.
605 *
606 * @return the <code>Container</code> that holds the component-contents
607 */
608 public Container getContentPane() { return contentPane; }
609
610 // PENDING(klobad) Should this reparent the contentPane and MenuBar?
611 /**
612 * Sets the layered pane for the root pane. The layered pane
613 * typically holds a content pane and an optional <code>JMenuBar</code>.
614 *
615 * @param layered the <code>JLayeredPane</code> to use
616 * @exception java.awt.IllegalComponentStateException (a runtime
617 * exception) if the layered pane parameter is <code>null</code>
618 */
619 public void setLayeredPane(JLayeredPane layered) {
620 if(layered == null)
621 throw new IllegalComponentStateException("layeredPane cannot be set to null.");
622 if(layeredPane != null && layeredPane.getParent() == this)
623 this.remove(layeredPane);
624 layeredPane = layered;
625
626 this.add(layeredPane, -1);
627 }
628 /**
629 * Gets the layered pane used by the root pane. The layered pane
630 * typically holds a content pane and an optional <code>JMenuBar</code>.
631 *
632 * @return the <code>JLayeredPane</code> currently in use
633 */
634 public JLayeredPane getLayeredPane() { return layeredPane; }
635
636 /**
637 * Sets a specified <code>Component</code> to be the glass pane for this
638 * root pane. The glass pane should normally be a lightweight,
639 * transparent component, because it will be made visible when
640 * ever the root pane needs to grab input events.
641 * <p>
642 * The new glass pane's visibility is changed to match that of
643 * the current glass pane. An implication of this is that care
644 * must be taken when you want to replace the glass pane and
645 * make it visible. Either of the following will work:
646 * <pre>
647 * root.setGlassPane(newGlassPane);
648 * newGlassPane.setVisible(true);
649 * </pre>
650 * or:
651 * <pre>
652 * root.getGlassPane().setVisible(true);
653 * root.setGlassPane(newGlassPane);
654 * </pre>
655 *
656 * @param glass the <code>Component</code> to use as the glass pane
657 * for this <code>JRootPane</code>
658 * @exception NullPointerException if the <code>glass</code> parameter is
659 * <code>null</code>
660 */
661 public void setGlassPane(Component glass) {
662 if (glass == null) {
663 throw new NullPointerException("glassPane cannot be set to null.");
664 }
665
666 glass.setMixingCutoutShape(new Rectangle());
667
668 boolean visible = false;
669 if (glassPane != null && glassPane.getParent() == this) {
670 this.remove(glassPane);
671 visible = glassPane.isVisible();
672 }
673
674 glass.setVisible(visible);
675 glassPane = glass;
676 this.add(glassPane, 0);
677 if (visible) {
678 repaint();
679 }
680 }
681
682 /**
683 * Returns the current glass pane for this <code>JRootPane</code>.
684 * @return the current glass pane
685 * @see #setGlassPane
686 */
687 public Component getGlassPane() {
688 return glassPane;
689 }
690
691 /**
692 * If a descendant of this <code>JRootPane</code> calls
693 * <code>revalidate</code>, validate from here on down.
694 *<p>
695 * Deferred requests to layout a component and its descendents again.
696 * For example, calls to <code>revalidate</code>, are pushed upwards to
697 * either a <code>JRootPane</code> or a <code>JScrollPane</code>
698 * because both classes override <code>isValidateRoot</code> to return true.
699 *
700 * @see JComponent#isValidateRoot
701 * @see java.awt.Container#isValidateRoot
702 * @return true
703 */
704 @Override
705 public boolean isValidateRoot() {
706 return true;
707 }
708
709 /**
710 * The <code>glassPane</code> and <code>contentPane</code>
711 * have the same bounds, which means <code>JRootPane</code>
712 * does not tiles its children and this should return false.
713 * On the other hand, the <code>glassPane</code>
714 * is normally not visible, and so this can return true if the
715 * <code>glassPane</code> isn't visible. Therefore, the
716 * return value here depends upon the visibility of the
717 * <code>glassPane</code>.
718 *
719 * @return true if this component's children don't overlap
720 */
721 public boolean isOptimizedDrawingEnabled() {
722 return !glassPane.isVisible();
723 }
724
725 /**
726 * {@inheritDoc}
727 */
728 public void addNotify() {
729 super.addNotify();
730 enableEvents(AWTEvent.KEY_EVENT_MASK);
731 }
732
733 /**
734 * {@inheritDoc}
735 */
736 public void removeNotify() {
737 super.removeNotify();
738 }
739
740
741 /**
742 * Sets the <code>defaultButton</code> property,
743 * which determines the current default button for this <code>JRootPane</code>.
744 * The default button is the button which will be activated
745 * when a UI-defined activation event (typically the <b>Enter</b> key)
746 * occurs in the root pane regardless of whether or not the button
747 * has keyboard focus (unless there is another component within
748 * the root pane which consumes the activation event,
749 * such as a <code>JTextPane</code>).
750 * For default activation to work, the button must be an enabled
751 * descendent of the root pane when activation occurs.
752 * To remove a default button from this root pane, set this
753 * property to <code>null</code>.
754 *
755 * @see JButton#isDefaultButton
756 * @param defaultButton the <code>JButton</code> which is to be the default button
757 */
758 @BeanProperty(description
759 = "The button activated by default in this root pane")
760 public void setDefaultButton(JButton defaultButton) {
761 JButton oldDefault = this.defaultButton;
762
763 if (oldDefault != defaultButton) {
764 this.defaultButton = defaultButton;
765
766 if (oldDefault != null) {
767 oldDefault.repaint();
768 }
769 if (defaultButton != null) {
770 defaultButton.repaint();
771 }
772 }
773
774 firePropertyChange("defaultButton", oldDefault, defaultButton);
775 }
776
777 /**
778 * Returns the value of the <code>defaultButton</code> property.
779 * @return the <code>JButton</code> which is currently the default button
780 * @see #setDefaultButton
781 */
782 public JButton getDefaultButton() {
783 return defaultButton;
784 }
785
786 final void setUseTrueDoubleBuffering(boolean useTrueDoubleBuffering) {
787 this.useTrueDoubleBuffering = useTrueDoubleBuffering;
788 }
789
790 final boolean getUseTrueDoubleBuffering() {
791 return useTrueDoubleBuffering;
792 }
793
794 final void disableTrueDoubleBuffering() {
795 if (useTrueDoubleBuffering) {
796 if (!IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING) {
797 if (LOG_DISABLE_TRUE_DOUBLE_BUFFERING) {
798 System.out.println("Disabling true double buffering for " +
799 this);
800 Thread.dumpStack();
801 }
802 useTrueDoubleBuffering = false;
803 RepaintManager.currentManager(this).
804 doubleBufferingChanged(this);
805 }
806 }
807 }
808
809 /**
810 * Overridden to enforce the position of the glass component as
811 * the zero child.
812 *
813 * @param comp the component to be enhanced
814 * @param constraints the constraints to be respected
815 * @param index the index
816 */
817 protected void addImpl(Component comp, Object constraints, int index) {
818 super.addImpl(comp, constraints, index);
819
820 /// We are making sure the glassPane is on top.
821 if(glassPane != null
822 && glassPane.getParent() == this
823 && getComponent(0) != glassPane) {
824 add(glassPane, 0);
825 }
826 }
827
828
829 ///////////////////////////////////////////////////////////////////////////////
830 //// Begin Inner Classes
831 ///////////////////////////////////////////////////////////////////////////////
832
833
834 /**
835 * A custom layout manager that is responsible for the layout of
836 * layeredPane, glassPane, and menuBar.
837 * <p>
838 * <strong>Warning:</strong>
839 * Serialized objects of this class will not be compatible with
840 * future Swing releases. The current serialization support is
841 * appropriate for short term storage or RMI between applications running
842 * the same version of Swing. As of 1.4, support for long term storage
843 * of all JavaBeans
844 * has been added to the <code>java.beans</code> package.
845 * Please see {@link java.beans.XMLEncoder}.
846 */
847 @SuppressWarnings("serial")
848 protected class RootLayout implements LayoutManager2, Serializable
849 {
850 /**
851 * Returns the amount of space the layout would like to have.
852 *
853 * @param parent the Container for which this layout manager
854 * is being used
855 * @return a Dimension object containing the layout's preferred size
856 */
857 public Dimension preferredLayoutSize(Container parent) {
858 Dimension rd, mbd;
859 Insets i = getInsets();
860
861 if(contentPane != null) {
862 rd = contentPane.getPreferredSize();
863 } else {
864 rd = parent.getSize();
865 }
866 if(menuBar != null && menuBar.isVisible()) {
867 mbd = menuBar.getPreferredSize();
868 } else {
869 mbd = new Dimension(0, 0);
870 }
871 return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
872 rd.height + mbd.height + i.top + i.bottom);
873 }
874
875 /**
876 * Returns the minimum amount of space the layout needs.
877 *
878 * @param parent the Container for which this layout manager
879 * is being used
880 * @return a Dimension object containing the layout's minimum size
881 */
882 public Dimension minimumLayoutSize(Container parent) {
883 Dimension rd, mbd;
884 Insets i = getInsets();
885 if(contentPane != null) {
886 rd = contentPane.getMinimumSize();
887 } else {
888 rd = parent.getSize();
889 }
890 if(menuBar != null && menuBar.isVisible()) {
891 mbd = menuBar.getMinimumSize();
892 } else {
893 mbd = new Dimension(0, 0);
894 }
895 return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
896 rd.height + mbd.height + i.top + i.bottom);
897 }
898
899 /**
900 * Returns the maximum amount of space the layout can use.
901 *
902 * @param target the Container for which this layout manager
903 * is being used
904 * @return a Dimension object containing the layout's maximum size
905 */
906 public Dimension maximumLayoutSize(Container target) {
907 Dimension rd, mbd;
908 Insets i = getInsets();
909 if(menuBar != null && menuBar.isVisible()) {
910 mbd = menuBar.getMaximumSize();
911 } else {
912 mbd = new Dimension(0, 0);
913 }
914 if(contentPane != null) {
915 rd = contentPane.getMaximumSize();
916 } else {
917 // This is silly, but should stop an overflow error
918 rd = new Dimension(Integer.MAX_VALUE,
919 Integer.MAX_VALUE - i.top - i.bottom - mbd.height - 1);
920 }
921 return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
922 rd.height + mbd.height + i.top + i.bottom);
923 }
924
925 /**
926 * Instructs the layout manager to perform the layout for the specified
927 * container.
928 *
929 * @param parent the Container for which this layout manager
930 * is being used
931 */
932 public void layoutContainer(Container parent) {
933 Rectangle b = parent.getBounds();
934 Insets i = getInsets();
935 int contentY = 0;
936 int w = b.width - i.right - i.left;
937 int h = b.height - i.top - i.bottom;
938
939 if(layeredPane != null) {
940 layeredPane.setBounds(i.left, i.top, w, h);
941 }
942 if(glassPane != null) {
943 glassPane.setBounds(i.left, i.top, w, h);
944 }
945 // Note: This is laying out the children in the layeredPane,
946 // technically, these are not our children.
947 if(menuBar != null && menuBar.isVisible()) {
948 Dimension mbd = menuBar.getPreferredSize();
949 menuBar.setBounds(0, 0, w, mbd.height);
950 contentY += mbd.height;
951 }
952 if(contentPane != null) {
953 contentPane.setBounds(0, contentY, w, h - contentY);
954 }
955 }
956
957 public void addLayoutComponent(String name, Component comp) {}
958 public void removeLayoutComponent(Component comp) {}
959 public void addLayoutComponent(Component comp, Object constraints) {}
960 public float getLayoutAlignmentX(Container target) { return 0.0f; }
961 public float getLayoutAlignmentY(Container target) { return 0.0f; }
962 public void invalidateLayout(Container target) {}
963 }
964
965 /**
966 * Returns a string representation of this <code>JRootPane</code>.
967 * This method is intended to be used only for debugging purposes,
968 * and the content and format of the returned string may vary between
969 * implementations. The returned string may be empty but may not
970 * be <code>null</code>.
971 *
972 * @return a string representation of this <code>JRootPane</code>.
973 */
974 protected String paramString() {
975 return super.paramString();
976 }
977
978 /////////////////
979 // Accessibility support
980 ////////////////
981
982 /**
983 * Gets the <code>AccessibleContext</code> associated with this
984 * <code>JRootPane</code>. For root panes, the
985 * <code>AccessibleContext</code> takes the form of an
986 * <code>AccessibleJRootPane</code>.
987 * A new <code>AccessibleJRootPane</code> instance is created if necessary.
988 *
989 * @return an <code>AccessibleJRootPane</code> that serves as the
990 * <code>AccessibleContext</code> of this <code>JRootPane</code>
991 */
992 public AccessibleContext getAccessibleContext() {
993 if (accessibleContext == null) {
994 accessibleContext = new AccessibleJRootPane();
995 }
996 return accessibleContext;
997 }
998
999 /**
1000 * This class implements accessibility support for the
1001 * <code>JRootPane</code> class. It provides an implementation of the
1002 * Java Accessibility API appropriate to root pane user-interface elements.
1003 * <p>
1004 * <strong>Warning:</strong>
1005 * Serialized objects of this class will not be compatible with
1006 * future Swing releases. The current serialization support is
1007 * appropriate for short term storage or RMI between applications running
1008 * the same version of Swing. As of 1.4, support for long term storage
1009 * of all JavaBeans
1010 * has been added to the <code>java.beans</code> package.
1011 * Please see {@link java.beans.XMLEncoder}.
1012 */
1013 @SuppressWarnings("serial")
1014 protected class AccessibleJRootPane extends AccessibleJComponent {
1015 /**
1016 * Get the role of this object.
1017 *
1018 * @return an instance of AccessibleRole describing the role of
1019 * the object
1020 */
1021 public AccessibleRole getAccessibleRole() {
1022 return AccessibleRole.ROOT_PANE;
1023 }
1024
1025 /**
1026 * Returns the number of accessible children of the object.
1027 *
1028 * @return the number of accessible children of the object.
1029 */
1030 public int getAccessibleChildrenCount() {
1031 return super.getAccessibleChildrenCount();
1032 }
1033
1034 /**
1035 * Returns the specified Accessible child of the object. The Accessible
1036 * children of an Accessible object are zero-based, so the first child
1037 * of an Accessible child is at index 0, the second child is at index 1,
1038 * and so on.
1039 *
1040 * @param i zero-based index of child
1041 * @return the Accessible child of the object
1042 * @see #getAccessibleChildrenCount
1043 */
1044 public Accessible getAccessibleChild(int i) {
1045 return super.getAccessibleChild(i);
1046 }
1047 } // inner class AccessibleJRootPane
1048 }