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
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="http://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 * <table style="float:right" border="0" summary="layout">
74 * <tr>
75 * <td align="center">
76 * <img src="doc-files/JRootPane-2.gif"
77 * alt="The following text describes this graphic." HEIGHT=386 WIDTH=349>
78 * </td>
79 * </tr>
80 * </table>
81 * The diagram at right shows the structure of a <code>JRootPane</code>.
82 * A <code>JRootpane</code> is made up of a <code>glassPane</code>,
83 * an optional <code>menuBar</code>, and a <code>contentPane</code>.
84 * (The <code>JLayeredPane</code> manages the <code>menuBar</code>
85 * and the <code>contentPane</code>.)
86 * The <code>glassPane</code> sits over the top of everything,
87 * where it is in a position to intercept mouse movements.
88 * Since the <code>glassPane</code> (like the <code>contentPane</code>)
89 * can be an arbitrary component, it is also possible to set up the
90 * <code>glassPane</code> for drawing. Lines and images on the
91 * <code>glassPane</code> can then range
92 * over the frames underneath without being limited by their boundaries.
93 * <p>
94 * Although the <code>menuBar</code> component is optional,
95 * the <code>layeredPane</code>, <code>contentPane</code>,
96 * and <code>glassPane</code> always exist.
97 * Attempting to set them to <code>null</code> generates an exception.
98 * <p>
99 * To add components to the <code>JRootPane</code> (other than the
100 * optional menu bar), you add the object to the <code>contentPane</code>
101 * of the <code>JRootPane</code>, like this:
102 * <pre>
103 * rootPane.getContentPane().add(child);
104 * </pre>
105 * The same principle holds true for setting layout managers, removing
106 * components, listing children, etc. All these methods are invoked on
107 * the <code>contentPane</code> instead of on the <code>JRootPane</code>.
108 * <blockquote>
109 * <b>Note:</b> The default layout manager for the <code>contentPane</code> is
110 * a <code>BorderLayout</code> manager. However, the <code>JRootPane</code>
111 * uses a custom <code>LayoutManager</code>.
112 * So, when you want to change the layout manager for the components you added
113 * to a <code>JRootPane</code>, be sure to use code like this:
114 * <pre>
115 * rootPane.getContentPane().setLayout(new BoxLayout());
116 * </pre></blockquote>
117 * If a <code>JMenuBar</code> component is set on the <code>JRootPane</code>,
118 * it is positioned along the upper edge of the frame.
119 * The <code>contentPane</code> is adjusted in location and size to
120 * fill the remaining area.
121 * (The <code>JMenuBar</code> and the <code>contentPane</code> are added to the
122 * <code>layeredPane</code> component at the
123 * <code>JLayeredPane.FRAME_CONTENT_LAYER</code> layer.)
124 * <p>
125 * The <code>layeredPane</code> is the parent of all children in the
126 * <code>JRootPane</code> -- both as the direct parent of the menu and
127 * the grandparent of all components added to the <code>contentPane</code>.
128 * It is an instance of <code>JLayeredPane</code>,
129 * which provides the ability to add components at several layers.
130 * This capability is very useful when working with menu popups,
131 * dialog boxes, and dragging -- situations in which you need to place
132 * a component on top of all other components in the pane.
133 * <p>
134 * The <code>glassPane</code> sits on top of all other components in the
135 * <code>JRootPane</code>.
136 * That provides a convenient place to draw above all other components,
137 * and makes it possible to intercept mouse events,
138 * which is useful both for dragging and for drawing.
139 * Developers can use <code>setVisible</code> on the <code>glassPane</code>
140 * to control when the <code>glassPane</code> displays over the other children.
141 * By default the <code>glassPane</code> is not visible.
142 * <p>
143 * The custom <code>LayoutManager</code> used by <code>JRootPane</code>
144 * ensures that:
145 * <OL>
146 * <LI>The <code>glassPane</code> fills the entire viewable
147 * area of the <code>JRootPane</code> (bounds - insets).
148 * <LI>The <code>layeredPane</code> fills the entire viewable area of the
149 * <code>JRootPane</code>. (bounds - insets)
150 * <LI>The <code>menuBar</code> is positioned at the upper edge of the
151 * <code>layeredPane</code>.
152 * <LI>The <code>contentPane</code> fills the entire viewable area,
153 * minus the <code>menuBar</code>, if present.
154 * </OL>
155 * Any other views in the <code>JRootPane</code> view hierarchy are ignored.
156 * <p>
157 * If you replace the <code>LayoutManager</code> of the <code>JRootPane</code>,
158 * you are responsible for managing all of these views.
159 * So ordinarily you will want to be sure that you
160 * change the layout manager for the <code>contentPane</code> rather than
161 * for the <code>JRootPane</code> itself!
162 * <p>
163 * The painting architecture of Swing requires an opaque
164 * <code>JComponent</code>
165 * to exist in the containment hierarchy above all other components. This is
166 * typically provided by way of the content pane. If you replace the content
167 * pane, it is recommended that you make the content pane opaque
168 * by way of <code>setOpaque(true)</code>. Additionally, if the content pane
169 * overrides <code>paintComponent</code>, it
170 * will need to completely fill in the background in an opaque color in
171 * <code>paintComponent</code>.
172 * <p>
173 * <strong>Warning:</strong> Swing is not thread safe. For more
174 * information see <a
175 * href="package-summary.html#threading">Swing's Threading
176 * Policy</a>.
177 * <p>
178 * <strong>Warning:</strong>
179 * Serialized objects of this class will not be compatible with
180 * future Swing releases. The current serialization support is
181 * appropriate for short term storage or RMI between applications running
182 * the same version of Swing. As of 1.4, support for long term storage
183 * of all JavaBeans™
184 * has been added to the <code>java.beans</code> package.
185 * Please see {@link java.beans.XMLEncoder}.
186 *
187 * @see JLayeredPane
188 * @see JMenuBar
189 * @see JWindow
190 * @see JFrame
191 * @see JDialog
192 * @see JApplet
193 * @see JInternalFrame
194 * @see JComponent
195 * @see BoxLayout
196 *
197 * @see <a href="http://www.oracle.com/technetwork/articles/java/mixing-components-433992.html">
198 * Mixing Heavy and Light Components</a>
199 *
200 * @author David Kloba
201 * @since 1.2
202 */
203 /// PENDING(klobad) Who should be opaque in this component?
204 @SuppressWarnings("serial")
205 public class JRootPane extends JComponent implements Accessible {
206
207 private static final String uiClassID = "RootPaneUI";
208
209 /**
210 * Whether or not we should dump the stack when true double buffering
211 * is disabled. Default is false.
212 */
213 private static final boolean LOG_DISABLE_TRUE_DOUBLE_BUFFERING;
214
215 /**
216 * Whether or not we should ignore requests to disable true double
217 * buffering. Default is false.
218 */
219 private static final boolean IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING;
220
221 /**
222 * Constant used for the windowDecorationStyle property. Indicates that
223 * the <code>JRootPane</code> should not provide any sort of
224 * Window decorations.
225 *
226 * @since 1.4
227 */
228 public static final int NONE = 0;
229
230 /**
231 * Constant used for the windowDecorationStyle property. Indicates that
232 * the <code>JRootPane</code> should provide decorations appropriate for
233 * a Frame.
234 *
235 * @since 1.4
236 */
237 public static final int FRAME = 1;
238
239 /**
240 * Constant used for the windowDecorationStyle property. Indicates that
241 * the <code>JRootPane</code> should provide decorations appropriate for
242 * a Dialog.
243 *
244 * @since 1.4
245 */
246 public static final int PLAIN_DIALOG = 2;
247
248 /**
249 * Constant used for the windowDecorationStyle property. Indicates that
250 * the <code>JRootPane</code> should provide decorations appropriate for
251 * a Dialog used to display an informational message.
252 *
253 * @since 1.4
254 */
255 public static final int INFORMATION_DIALOG = 3;
256
257 /**
258 * Constant used for the windowDecorationStyle property. Indicates that
259 * the <code>JRootPane</code> should provide decorations appropriate for
260 * a Dialog used to display an error message.
261 *
262 * @since 1.4
263 */
264 public static final int ERROR_DIALOG = 4;
265
266 /**
267 * Constant used for the windowDecorationStyle property. Indicates that
268 * the <code>JRootPane</code> should provide decorations appropriate for
269 * a Dialog used to display a <code>JColorChooser</code>.
270 *
271 * @since 1.4
272 */
273 public static final int COLOR_CHOOSER_DIALOG = 5;
274
275 /**
276 * Constant used for the windowDecorationStyle property. Indicates that
277 * the <code>JRootPane</code> should provide decorations appropriate for
278 * a Dialog used to display a <code>JFileChooser</code>.
279 *
280 * @since 1.4
281 */
282 public static final int FILE_CHOOSER_DIALOG = 6;
283
284 /**
285 * Constant used for the windowDecorationStyle property. Indicates that
286 * the <code>JRootPane</code> should provide decorations appropriate for
287 * a Dialog used to present a question to the user.
288 *
289 * @since 1.4
290 */
291 public static final int QUESTION_DIALOG = 7;
292
293 /**
294 * Constant used for the windowDecorationStyle property. Indicates that
295 * the <code>JRootPane</code> should provide decorations appropriate for
296 * a Dialog used to display a warning message.
297 *
298 * @since 1.4
299 */
300 public static final int WARNING_DIALOG = 8;
301
302 private int windowDecorationStyle;
303
304 /** The menu bar. */
305 protected JMenuBar menuBar;
306
307 /** The content pane. */
308 protected Container contentPane;
309
310 /** The layered pane that manages the menu bar and content pane. */
311 protected JLayeredPane layeredPane;
312
313 /**
314 * The glass pane that overlays the menu bar and content pane,
315 * so it can intercept mouse movements and such.
316 */
317 protected Component glassPane;
318 /**
319 * The button that gets activated when the pane has the focus and
320 * a UI-specific action like pressing the <b>Enter</b> key occurs.
321 */
322 protected JButton defaultButton;
323
324 /**
325 * Whether or not true double buffering should be used. This is typically
326 * true, but may be set to false in special situations. For example,
327 * heavy weight popups (backed by a window) set this to false.
328 */
329 boolean useTrueDoubleBuffering = true;
330
331 static {
332 LOG_DISABLE_TRUE_DOUBLE_BUFFERING =
333 AccessController.doPrivileged(new GetBooleanAction(
334 "swing.logDoubleBufferingDisable"));
335 IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING =
336 AccessController.doPrivileged(new GetBooleanAction(
337 "swing.ignoreDoubleBufferingDisable"));
338 }
339
340 /**
341 * Creates a <code>JRootPane</code>, setting up its
342 * <code>glassPane</code>, <code>layeredPane</code>,
343 * and <code>contentPane</code>.
344 */
345 public JRootPane() {
346 setGlassPane(createGlassPane());
347 setLayeredPane(createLayeredPane());
348 setContentPane(createContentPane());
349 setLayout(createRootLayout());
350 setDoubleBuffered(true);
351 updateUI();
352 }
353
354 /**
355 * {@inheritDoc}
356 * @since 1.6
357 */
358 public void setDoubleBuffered(boolean aFlag) {
359 if (isDoubleBuffered() != aFlag) {
360 super.setDoubleBuffered(aFlag);
361 RepaintManager.currentManager(this).doubleBufferingChanged(this);
362 }
363 }
364
365 /**
366 * Returns a constant identifying the type of Window decorations the
367 * <code>JRootPane</code> is providing.
368 *
369 * @return One of <code>NONE</code>, <code>FRAME</code>,
370 * <code>PLAIN_DIALOG</code>, <code>INFORMATION_DIALOG</code>,
371 * <code>ERROR_DIALOG</code>, <code>COLOR_CHOOSER_DIALOG</code>,
372 * <code>FILE_CHOOSER_DIALOG</code>, <code>QUESTION_DIALOG</code> or
373 * <code>WARNING_DIALOG</code>.
374 * @see #setWindowDecorationStyle
375 * @since 1.4
376 */
377 public int getWindowDecorationStyle() {
378 return windowDecorationStyle;
379 }
380
381 /**
382 * Sets the type of Window decorations (such as borders, widgets for
383 * closing a Window, title ...) the <code>JRootPane</code> should
384 * provide. The default is to provide no Window decorations
385 * (<code>NONE</code>).
386 * <p>
387 * This is only a hint, and some look and feels may not support
388 * this.
389 * This is a bound property.
390 *
391 * @param windowDecorationStyle Constant identifying Window decorations
392 * to provide.
393 * @see JDialog#setDefaultLookAndFeelDecorated
394 * @see JFrame#setDefaultLookAndFeelDecorated
395 * @see LookAndFeel#getSupportsWindowDecorations
396 * @throws IllegalArgumentException if <code>style</code> is
397 * not one of: <code>NONE</code>, <code>FRAME</code>,
398 * <code>PLAIN_DIALOG</code>, <code>INFORMATION_DIALOG</code>,
399 * <code>ERROR_DIALOG</code>, <code>COLOR_CHOOSER_DIALOG</code>,
400 * <code>FILE_CHOOSER_DIALOG</code>, <code>QUESTION_DIALOG</code>, or
401 * <code>WARNING_DIALOG</code>.
402 * @since 1.4
403 */
404 @BeanProperty(expert = true, visualUpdate = true, enumerationValues = {
405 "JRootPane.NONE",
406 "JRootPane.FRAME",
407 "JRootPane.PLAIN_DIALOG",
408 "JRootPane.INFORMATION_DIALOG",
409 "JRootPane.ERROR_DIALOG",
410 "JRootPane.COLOR_CHOOSER_DIALOG",
411 "JRootPane.FILE_CHOOSER_DIALOG",
412 "JRootPane.QUESTION_DIALOG",
413 "JRootPane.WARNING_DIALOG"}, description
414 = "Identifies the type of Window decorations to provide")
415 public void setWindowDecorationStyle(int windowDecorationStyle) {
416 if (windowDecorationStyle < 0 ||
417 windowDecorationStyle > WARNING_DIALOG) {
418 throw new IllegalArgumentException("Invalid decoration style");
419 }
420 int oldWindowDecorationStyle = getWindowDecorationStyle();
421 this.windowDecorationStyle = windowDecorationStyle;
422 firePropertyChange("windowDecorationStyle",
423 oldWindowDecorationStyle,
424 windowDecorationStyle);
425 }
426
427 /**
428 * Returns the L&F object that renders this component.
429 *
430 * @return <code>LabelUI</code> object
431 * @since 1.3
432 */
433 public RootPaneUI getUI() {
434 return (RootPaneUI)ui;
435 }
436
437 /**
438 * Sets the L&F object that renders this component.
439 *
440 * @param ui the <code>LabelUI</code> L&F object
441 * @see UIDefaults#getUI
442 * @since 1.3
443 */
444 @BeanProperty(expert = true, hidden = true, visualUpdate = true, description
445 = "The UI object that implements the Component's LookAndFeel.")
446 public void setUI(RootPaneUI ui) {
447 super.setUI(ui);
448 }
449
450
451 /**
452 * Resets the UI property to a value from the current look and feel.
453 *
454 * @see JComponent#updateUI
455 */
456 public void updateUI() {
457 setUI((RootPaneUI)UIManager.getUI(this));
458 }
459
460
461 /**
462 * Returns a string that specifies the name of the L&F class
463 * that renders this component.
464 *
465 * @return the string "RootPaneUI"
466 *
467 * @see JComponent#getUIClassID
468 * @see UIDefaults#getUI
469 */
470 public String getUIClassID() {
471 return uiClassID;
472 }
473
474 /**
475 * Called by the constructor methods to create the default
476 * <code>layeredPane</code>.
477 * Bt default it creates a new <code>JLayeredPane</code>.
478 * @return the default <code>layeredPane</code>
479 */
480 protected JLayeredPane createLayeredPane() {
481 JLayeredPane p = new JLayeredPane();
482 p.setName(this.getName()+".layeredPane");
483 return p;
484 }
485
486 /**
487 * Called by the constructor methods to create the default
488 * <code>contentPane</code>.
489 * By default this method creates a new <code>JComponent</code> add sets a
490 * <code>BorderLayout</code> as its <code>LayoutManager</code>.
491 * @return the default <code>contentPane</code>
492 */
493 protected Container createContentPane() {
494 JComponent c = new JPanel();
495 c.setName(this.getName()+".contentPane");
496 c.setLayout(new BorderLayout() {
497 /* This BorderLayout subclass maps a null constraint to CENTER.
498 * Although the reference BorderLayout also does this, some VMs
499 * throw an IllegalArgumentException.
500 */
501 public void addLayoutComponent(Component comp, Object constraints) {
502 if (constraints == null) {
503 constraints = BorderLayout.CENTER;
504 }
505 super.addLayoutComponent(comp, constraints);
506 }
507 });
508 return c;
509 }
510
511 /**
512 * Called by the constructor methods to create the default
513 * <code>glassPane</code>.
514 * By default this method creates a new <code>JComponent</code>
515 * with visibility set to false.
516 * @return the default <code>glassPane</code>
517 */
518 protected Component createGlassPane() {
519 JComponent c = new JPanel();
520 c.setName(this.getName()+".glassPane");
521 c.setVisible(false);
522 ((JPanel)c).setOpaque(false);
523 return c;
524 }
525
526 /**
527 * Called by the constructor methods to create the default
528 * <code>layoutManager</code>.
529 * @return the default <code>layoutManager</code>.
530 */
531 protected LayoutManager createRootLayout() {
532 return new RootLayout();
533 }
534
535 /**
536 * Adds or changes the menu bar used in the layered pane.
537 * @param menu the <code>JMenuBar</code> to add
538 */
539 public void setJMenuBar(JMenuBar menu) {
540 if(menuBar != null && menuBar.getParent() == layeredPane)
541 layeredPane.remove(menuBar);
542 menuBar = menu;
543
544 if(menuBar != null) {
545 menuBar.updateUI();
546 layeredPane.add(menuBar, JLayeredPane.FRAME_CONTENT_LAYER);
547 }
548 }
549
550 /**
551 * Specifies the menu bar value.
552 * @deprecated As of Swing version 1.0.3
553 * replaced by <code>setJMenuBar(JMenuBar menu)</code>.
554 * @param menu the <code>JMenuBar</code> to add.
555 */
556 @Deprecated
557 public void setMenuBar(JMenuBar menu){
558 if(menuBar != null && menuBar.getParent() == layeredPane)
559 layeredPane.remove(menuBar);
560 menuBar = menu;
561
562 if(menuBar != null)
563 layeredPane.add(menuBar, JLayeredPane.FRAME_CONTENT_LAYER);
564 }
565
566 /**
567 * Returns the menu bar from the layered pane.
568 * @return the <code>JMenuBar</code> used in the pane
569 */
570 public JMenuBar getJMenuBar() { return menuBar; }
571
572 /**
573 * Returns the menu bar value.
574 * @deprecated As of Swing version 1.0.3
575 * replaced by <code>getJMenuBar()</code>.
576 * @return the <code>JMenuBar</code> used in the pane
577 */
578 @Deprecated
579 public JMenuBar getMenuBar() { return menuBar; }
580
581 /**
582 * Sets the content pane -- the container that holds the components
583 * parented by the root pane.
584 * <p>
585 * Swing's painting architecture requires an opaque <code>JComponent</code>
586 * in the containment hierarchy. This is typically provided by the
587 * content pane. If you replace the content pane it is recommended you
588 * replace it with an opaque <code>JComponent</code>.
589 *
590 * @param content the <code>Container</code> to use for component-contents
591 * @exception java.awt.IllegalComponentStateException (a runtime
592 * exception) if the content pane parameter is <code>null</code>
593 */
594 public void setContentPane(Container content) {
595 if(content == null)
596 throw new IllegalComponentStateException("contentPane cannot be set to null.");
597 if(contentPane != null && contentPane.getParent() == layeredPane)
598 layeredPane.remove(contentPane);
599 contentPane = content;
600
601 layeredPane.add(contentPane, JLayeredPane.FRAME_CONTENT_LAYER);
602 }
603
604 /**
605 * Returns the content pane -- the container that holds the components
606 * parented by the root pane.
607 *
608 * @return the <code>Container</code> that holds the component-contents
609 */
610 public Container getContentPane() { return contentPane; }
611
612 // PENDING(klobad) Should this reparent the contentPane and MenuBar?
613 /**
614 * Sets the layered pane for the root pane. The layered pane
615 * typically holds a content pane and an optional <code>JMenuBar</code>.
616 *
617 * @param layered the <code>JLayeredPane</code> to use
618 * @exception java.awt.IllegalComponentStateException (a runtime
619 * exception) if the layered pane parameter is <code>null</code>
620 */
621 public void setLayeredPane(JLayeredPane layered) {
622 if(layered == null)
623 throw new IllegalComponentStateException("layeredPane cannot be set to null.");
624 if(layeredPane != null && layeredPane.getParent() == this)
625 this.remove(layeredPane);
626 layeredPane = layered;
627
628 this.add(layeredPane, -1);
629 }
630 /**
631 * Gets the layered pane used by the root pane. The layered pane
632 * typically holds a content pane and an optional <code>JMenuBar</code>.
633 *
634 * @return the <code>JLayeredPane</code> currently in use
635 */
636 public JLayeredPane getLayeredPane() { return layeredPane; }
637
638 /**
639 * Sets a specified <code>Component</code> to be the glass pane for this
640 * root pane. The glass pane should normally be a lightweight,
641 * transparent component, because it will be made visible when
642 * ever the root pane needs to grab input events.
643 * <p>
644 * The new glass pane's visibility is changed to match that of
645 * the current glass pane. An implication of this is that care
646 * must be taken when you want to replace the glass pane and
647 * make it visible. Either of the following will work:
648 * <pre>
649 * root.setGlassPane(newGlassPane);
650 * newGlassPane.setVisible(true);
651 * </pre>
652 * or:
653 * <pre>
654 * root.getGlassPane().setVisible(true);
655 * root.setGlassPane(newGlassPane);
656 * </pre>
657 *
658 * @param glass the <code>Component</code> to use as the glass pane
659 * for this <code>JRootPane</code>
660 * @exception NullPointerException if the <code>glass</code> parameter is
661 * <code>null</code>
662 */
663 public void setGlassPane(Component glass) {
664 if (glass == null) {
665 throw new NullPointerException("glassPane cannot be set to null.");
666 }
667
668 glass.setMixingCutoutShape(new Rectangle());
669
670 boolean visible = false;
671 if (glassPane != null && glassPane.getParent() == this) {
672 this.remove(glassPane);
673 visible = glassPane.isVisible();
674 }
675
676 glass.setVisible(visible);
677 glassPane = glass;
678 this.add(glassPane, 0);
679 if (visible) {
680 repaint();
681 }
682 }
683
684 /**
685 * Returns the current glass pane for this <code>JRootPane</code>.
686 * @return the current glass pane
687 * @see #setGlassPane
688 */
689 public Component getGlassPane() {
690 return glassPane;
691 }
692
693 /**
694 * If a descendant of this <code>JRootPane</code> calls
695 * <code>revalidate</code>, validate from here on down.
696 *<p>
697 * Deferred requests to layout a component and its descendents again.
698 * For example, calls to <code>revalidate</code>, are pushed upwards to
699 * either a <code>JRootPane</code> or a <code>JScrollPane</code>
700 * because both classes override <code>isValidateRoot</code> to return true.
701 *
702 * @see JComponent#isValidateRoot
703 * @see java.awt.Container#isValidateRoot
704 * @return true
705 */
706 @Override
707 public boolean isValidateRoot() {
708 return true;
709 }
710
711 /**
712 * The <code>glassPane</code> and <code>contentPane</code>
713 * have the same bounds, which means <code>JRootPane</code>
714 * does not tiles its children and this should return false.
715 * On the other hand, the <code>glassPane</code>
716 * is normally not visible, and so this can return true if the
717 * <code>glassPane</code> isn't visible. Therefore, the
718 * return value here depends upon the visibility of the
719 * <code>glassPane</code>.
720 *
721 * @return true if this component's children don't overlap
722 */
723 public boolean isOptimizedDrawingEnabled() {
724 return !glassPane.isVisible();
725 }
726
727 /**
728 * {@inheritDoc}
729 */
730 public void addNotify() {
731 super.addNotify();
732 enableEvents(AWTEvent.KEY_EVENT_MASK);
733 }
734
735 /**
736 * {@inheritDoc}
737 */
738 public void removeNotify() {
739 super.removeNotify();
740 }
741
742
743 /**
744 * Sets the <code>defaultButton</code> property,
745 * which determines the current default button for this <code>JRootPane</code>.
746 * The default button is the button which will be activated
747 * when a UI-defined activation event (typically the <b>Enter</b> key)
748 * occurs in the root pane regardless of whether or not the button
749 * has keyboard focus (unless there is another component within
750 * the root pane which consumes the activation event,
751 * such as a <code>JTextPane</code>).
752 * For default activation to work, the button must be an enabled
753 * descendent of the root pane when activation occurs.
754 * To remove a default button from this root pane, set this
755 * property to <code>null</code>.
756 *
757 * @see JButton#isDefaultButton
758 * @param defaultButton the <code>JButton</code> which is to be the default button
759 */
760 @BeanProperty(description
761 = "The button activated by default in this root pane")
762 public void setDefaultButton(JButton defaultButton) {
763 JButton oldDefault = this.defaultButton;
764
765 if (oldDefault != defaultButton) {
766 this.defaultButton = defaultButton;
767
768 if (oldDefault != null) {
769 oldDefault.repaint();
770 }
771 if (defaultButton != null) {
772 defaultButton.repaint();
773 }
774 }
775
776 firePropertyChange("defaultButton", oldDefault, defaultButton);
777 }
778
779 /**
780 * Returns the value of the <code>defaultButton</code> property.
781 * @return the <code>JButton</code> which is currently the default button
782 * @see #setDefaultButton
783 */
784 public JButton getDefaultButton() {
785 return defaultButton;
786 }
787
788 final void setUseTrueDoubleBuffering(boolean useTrueDoubleBuffering) {
789 this.useTrueDoubleBuffering = useTrueDoubleBuffering;
790 }
791
792 final boolean getUseTrueDoubleBuffering() {
793 return useTrueDoubleBuffering;
794 }
795
796 final void disableTrueDoubleBuffering() {
797 if (useTrueDoubleBuffering) {
798 if (!IGNORE_DISABLE_TRUE_DOUBLE_BUFFERING) {
799 if (LOG_DISABLE_TRUE_DOUBLE_BUFFERING) {
800 System.out.println("Disabling true double buffering for " +
801 this);
802 Thread.dumpStack();
803 }
804 useTrueDoubleBuffering = false;
805 RepaintManager.currentManager(this).
806 doubleBufferingChanged(this);
807 }
808 }
809 }
810
811 /**
812 * Overridden to enforce the position of the glass component as
813 * the zero child.
814 *
815 * @param comp the component to be enhanced
816 * @param constraints the constraints to be respected
817 * @param index the index
818 */
819 protected void addImpl(Component comp, Object constraints, int index) {
820 super.addImpl(comp, constraints, index);
821
822 /// We are making sure the glassPane is on top.
823 if(glassPane != null
824 && glassPane.getParent() == this
825 && getComponent(0) != glassPane) {
826 add(glassPane, 0);
827 }
828 }
829
830
831 ///////////////////////////////////////////////////////////////////////////////
832 //// Begin Inner Classes
833 ///////////////////////////////////////////////////////////////////////////////
834
835
836 /**
837 * A custom layout manager that is responsible for the layout of
838 * layeredPane, glassPane, and menuBar.
839 * <p>
840 * <strong>Warning:</strong>
841 * Serialized objects of this class will not be compatible with
842 * future Swing releases. The current serialization support is
843 * appropriate for short term storage or RMI between applications running
844 * the same version of Swing. As of 1.4, support for long term storage
845 * of all JavaBeans™
846 * has been added to the <code>java.beans</code> package.
847 * Please see {@link java.beans.XMLEncoder}.
848 */
849 @SuppressWarnings("serial")
850 protected class RootLayout implements LayoutManager2, Serializable
851 {
852 /**
853 * Returns the amount of space the layout would like to have.
854 *
855 * @param parent the Container for which this layout manager
856 * is being used
857 * @return a Dimension object containing the layout's preferred size
858 */
859 public Dimension preferredLayoutSize(Container parent) {
860 Dimension rd, mbd;
861 Insets i = getInsets();
862
863 if(contentPane != null) {
864 rd = contentPane.getPreferredSize();
865 } else {
866 rd = parent.getSize();
867 }
868 if(menuBar != null && menuBar.isVisible()) {
869 mbd = menuBar.getPreferredSize();
870 } else {
871 mbd = new Dimension(0, 0);
872 }
873 return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
874 rd.height + mbd.height + i.top + i.bottom);
875 }
876
877 /**
878 * Returns the minimum amount of space the layout needs.
879 *
880 * @param parent the Container for which this layout manager
881 * is being used
882 * @return a Dimension object containing the layout's minimum size
883 */
884 public Dimension minimumLayoutSize(Container parent) {
885 Dimension rd, mbd;
886 Insets i = getInsets();
887 if(contentPane != null) {
888 rd = contentPane.getMinimumSize();
889 } else {
890 rd = parent.getSize();
891 }
892 if(menuBar != null && menuBar.isVisible()) {
893 mbd = menuBar.getMinimumSize();
894 } else {
895 mbd = new Dimension(0, 0);
896 }
897 return new Dimension(Math.max(rd.width, mbd.width) + i.left + i.right,
898 rd.height + mbd.height + i.top + i.bottom);
899 }
900
901 /**
902 * Returns the maximum amount of space the layout can use.
903 *
904 * @param target the Container for which this layout manager
905 * is being used
906 * @return a Dimension object containing the layout's maximum size
907 */
908 public Dimension maximumLayoutSize(Container target) {
909 Dimension rd, mbd;
910 Insets i = getInsets();
911 if(menuBar != null && menuBar.isVisible()) {
912 mbd = menuBar.getMaximumSize();
913 } else {
914 mbd = new Dimension(0, 0);
915 }
916 if(contentPane != null) {
917 rd = contentPane.getMaximumSize();
918 } else {
919 // This is silly, but should stop an overflow error
920 rd = new Dimension(Integer.MAX_VALUE,
921 Integer.MAX_VALUE - i.top - i.bottom - mbd.height - 1);
922 }
923 return new Dimension(Math.min(rd.width, mbd.width) + i.left + i.right,
924 rd.height + mbd.height + i.top + i.bottom);
925 }
926
927 /**
928 * Instructs the layout manager to perform the layout for the specified
929 * container.
930 *
931 * @param parent the Container for which this layout manager
932 * is being used
933 */
934 public void layoutContainer(Container parent) {
935 Rectangle b = parent.getBounds();
936 Insets i = getInsets();
937 int contentY = 0;
938 int w = b.width - i.right - i.left;
939 int h = b.height - i.top - i.bottom;
940
941 if(layeredPane != null) {
942 layeredPane.setBounds(i.left, i.top, w, h);
943 }
944 if(glassPane != null) {
945 glassPane.setBounds(i.left, i.top, w, h);
946 }
947 // Note: This is laying out the children in the layeredPane,
948 // technically, these are not our children.
949 if(menuBar != null && menuBar.isVisible()) {
950 Dimension mbd = menuBar.getPreferredSize();
951 menuBar.setBounds(0, 0, w, mbd.height);
952 contentY += mbd.height;
953 }
954 if(contentPane != null) {
955 contentPane.setBounds(0, contentY, w, h - contentY);
956 }
957 }
958
959 public void addLayoutComponent(String name, Component comp) {}
960 public void removeLayoutComponent(Component comp) {}
961 public void addLayoutComponent(Component comp, Object constraints) {}
962 public float getLayoutAlignmentX(Container target) { return 0.0f; }
963 public float getLayoutAlignmentY(Container target) { return 0.0f; }
964 public void invalidateLayout(Container target) {}
965 }
966
967 /**
968 * Returns a string representation of this <code>JRootPane</code>.
969 * This method is intended to be used only for debugging purposes,
970 * and the content and format of the returned string may vary between
971 * implementations. The returned string may be empty but may not
972 * be <code>null</code>.
973 *
974 * @return a string representation of this <code>JRootPane</code>.
975 */
976 protected String paramString() {
977 return super.paramString();
978 }
979
980 /////////////////
981 // Accessibility support
982 ////////////////
983
984 /**
985 * Gets the <code>AccessibleContext</code> associated with this
986 * <code>JRootPane</code>. For root panes, the
987 * <code>AccessibleContext</code> takes the form of an
988 * <code>AccessibleJRootPane</code>.
989 * A new <code>AccessibleJRootPane</code> instance is created if necessary.
990 *
991 * @return an <code>AccessibleJRootPane</code> that serves as the
992 * <code>AccessibleContext</code> of this <code>JRootPane</code>
993 */
994 public AccessibleContext getAccessibleContext() {
995 if (accessibleContext == null) {
996 accessibleContext = new AccessibleJRootPane();
997 }
998 return accessibleContext;
999 }
1000
1001 /**
1002 * This class implements accessibility support for the
1003 * <code>JRootPane</code> class. It provides an implementation of the
1004 * Java Accessibility API appropriate to root pane user-interface elements.
1005 * <p>
1006 * <strong>Warning:</strong>
1007 * Serialized objects of this class will not be compatible with
1008 * future Swing releases. The current serialization support is
1009 * appropriate for short term storage or RMI between applications running
1010 * the same version of Swing. As of 1.4, support for long term storage
1011 * of all JavaBeans™
1012 * has been added to the <code>java.beans</code> package.
1013 * Please see {@link java.beans.XMLEncoder}.
1014 */
1015 @SuppressWarnings("serial")
1016 protected class AccessibleJRootPane extends AccessibleJComponent {
1017 /**
1018 * Get the role of this object.
1019 *
1020 * @return an instance of AccessibleRole describing the role of
1021 * the object
1022 */
1023 public AccessibleRole getAccessibleRole() {
1024 return AccessibleRole.ROOT_PANE;
1025 }
1026
1027 /**
1028 * Returns the number of accessible children of the object.
1029 *
1030 * @return the number of accessible children of the object.
1031 */
1032 public int getAccessibleChildrenCount() {
1033 return super.getAccessibleChildrenCount();
1034 }
1035
1036 /**
1037 * Returns the specified Accessible child of the object. The Accessible
1038 * children of an Accessible object are zero-based, so the first child
1039 * of an Accessible child is at index 0, the second child is at index 1,
1040 * and so on.
1041 *
1042 * @param i zero-based index of child
1043 * @return the Accessible child of the object
1044 * @see #getAccessibleChildrenCount
1045 */
1046 public Accessible getAccessibleChild(int i) {
1047 return super.getAccessibleChild(i);
1048 }
1049 } // inner class AccessibleJRootPane
1050 }