Source Code Cross Referenced for Dialog.java in  » 6.0-JDK-Modules » j2me » java » awt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.awt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * @(#)Dialog.java	1.62 06/10/10
003:         *
004:         * Copyright  1990-2006 Sun Microsystems, Inc. All Rights Reserved.
005:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
006:         * 
007:         * This program is free software; you can redistribute it and/or
008:         * modify it under the terms of the GNU General Public License version
009:         * 2 only, as published by the Free Software Foundation. 
010:         * 
011:         * This program is distributed in the hope that it will be useful, but
012:         * WITHOUT ANY WARRANTY; without even the implied warranty of
013:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014:         * General Public License version 2 for more details (a copy is
015:         * included at /legal/license.txt). 
016:         * 
017:         * You should have received a copy of the GNU General Public License
018:         * version 2 along with this work; if not, write to the Free Software
019:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
020:         * 02110-1301 USA 
021:         * 
022:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
023:         * Clara, CA 95054 or visit www.sun.com if you need additional
024:         * information or have any questions. 
025:         *
026:         */
027:        package java.awt;
028:
029:        import java.awt.event.*;
030:        import java.io.ObjectOutputStream;
031:        import java.io.ObjectInputStream;
032:        import java.io.IOException;
033:
034:        /**
035:         * A dialog component is a top level window, .  It resembles a
036:         * frame, but has fewer properties. It does not have an icon or
037:         * a settable cursor. In PersonalJava and Personal Profile
038:         * implementations, the display of the title is optional.
039:         * <p>
040:         * A modal dialog, when visible, prevents the user from interacting
041:         * with AWT components. A modeless dialog behaves more like a Frame.
042:         * A Personal Profile Implementation must support modal dialogs.
043:         * Multiple (nested)  Modal Dialogs may be implemented so that only
044:         * a single dialog is visible at a time: when a new modal is shown,
045:         * it must become visible, and when it is dismissed, the previous modal
046:         * dialog must be shown.
047:         * <p>
048:         * Nonmodal  dialogs are optional in a Personal Profile implementation.
049:         * If they are not supported, an <em> UnsupportedOperationException </em> is
050:         * thrown when the consturctor is called and the system property
051:         * <em> java.awt.dialog.SupportsNonmodal </em> is set to "false".
052:         * <p>
053:         * The modality of a dialog cannot be changed after the dialog has been created.
054:         * <h3>System Properties</h3>
055:         * The following system properties will be set to either <code>"true"</code> or <code>"false"</code>
056:         * indicating which optional dialog features are supported by the Personal
057:         * Profile implementation:
058:         * <li>java.awt.dialog.SupportsNonmodal
059:         * <li>java.awt.dialog.SupportsMultipleModal
060:         * <li>java.awt.dialog.SupportsResize
061:         * <li>java.awt.dialog.SupportsTitle
062:         * @see WindowEvent
063:         * @see Window#addWindowListener
064:         *
065:         * @version 	1.46, 03/12/01
066:         * @author 	Sami Shaio
067:         * @author 	Arthur van Hoff
068:         * @since       JDK1.0
069:         */
070:        public class Dialog extends Window {
071:            boolean resizable = true;
072:            /**
073:             * Sets to true if the Dialog is modal.  A modal
074:             * Dialog grabs all the input to the parent frame from the user.
075:             */
076:            boolean modal;
077:            /**
078:             * The title of the Dialog.
079:             */
080:            String title;
081:            private transient boolean keepBlocking = false;
082:            private static final String base = "dialog";
083:            private static int nameCounter = 0;
084:            /*
085:             * JDK 1.1 serialVersionUID
086:             */
087:            private static final long serialVersionUID = 5920926903803293709L;
088:
089:            /**
090:             * Creates a dialog.
091:             * @param parent the non null parent of the dialog
092:             * @see Component#setSize
093:             * @see Component#setVisible
094:             * @exception UnsupportedOperationException If the implementation does not support
095:             *            modeless dialogs.
096:             * @exception IllegalArgumentException if the parent in null
097:             * @since JDK1.0
098:             */
099:            public Dialog(Frame parent) {
100:                this (parent, "", false);
101:            }
102:
103:            /**
104:             * Creates a dialog.
105:             * @param parent the non null parent of the dialog
106:             * @param modal the modality of the dialog. If true the dialog is modal,
107:             *        otherwise it is modeless. If the implementation does not
108:             *        support modeless dialogs and modal is false, an
109:             *        <em>UnsupportedOperationException</em> should be thrown.
110:             * @see Component#setSize
111:             * @see Component#setVisible
112:             * @exception UnsupportedOperationException If the implementation does not support
113:             *            modeless dialogs.
114:             * @exception IllegalArgumentException if the parent in null
115:             * @since JDK1.0
116:             */
117:            public Dialog(Frame parent, boolean modal) {
118:                this (parent, "", modal);
119:            }
120:
121:            /**
122:             * Creates a dialog.
123:             * @param parent the non null parent of the dialog
124:             * @param title the title of the dialog
125:             * @see Component#setSize
126:             * @see Component#setVisible
127:             * @exception UnsupportedOperationException If the implementation does not support
128:             *            modeless dialogs.
129:             * @exception IllegalArgumentException if the parent in null
130:             * @since JDK1.0
131:             */
132:            public Dialog(Frame parent, String title) {
133:                this (parent, title, false);
134:            }
135:
136:            /**
137:             * Creates a dialog.
138:             * @param parent the non null parent of the dialog
139:             * @param title the title of the dialog
140:             * @param modal the modality of the dialog. If true the dialog is modal,
141:             *        otherwise it is modeless. If the implementation does not
142:             *        support modeless dialogs and modal is false, an
143:             *        <em>UnsupportedOperationException</em> should be thrown.
144:             * @see Component#setSize
145:             * @see Component#setVisible
146:             * @exception UnsupportedOperationException If the implementation does not support
147:             *            modeless dialogs.
148:             * @exception IllegalArgumentException if the parent in null
149:             * @since JDK1.0
150:             */
151:            public Dialog(Frame parent, String title, boolean modal) {
152:                super (parent);
153:                if (parent == null) {
154:                    throw new IllegalArgumentException("null parent frame");
155:                }
156:                this .title = title;
157:                setModal(modal);
158:            }
159:
160:            /**
161:             * Construct a name for this component.  Called by getName() when the
162:             * name is null.
163:             */
164:            String constructComponentName() {
165:                return base + nameCounter++;
166:            }
167:
168:            /**
169:             * Creates the dialog's peer.  The peer allows us to change the appearance
170:             * of the frame without changing its functionality.
171:             * @since JDK1.0
172:             */
173:
174:            //    public void addNotify() {
175:            //        synchronized (getTreeLock()) {
176:            //            if (peer == null) {
177:            //                peer = ((PeerBasedToolkit)getToolkit()).createDialog(this);
178:            //            }
179:            //            super.addNotify();
180:            //        }
181:            //    }
182:            /**
183:             * Indicates whether the dialog is modal.
184:             * A modal dialog grabs all input from the user.
185:             * @return    <code>true</code> if this dialog window is modal;
186:             *            <code>false</code> otherwise.
187:             * @see       java.awt.Dialog#setModal
188:             * @since     JDK1.0
189:             */
190:            public boolean isModal() {
191:                return modal;
192:            }
193:
194:            /**
195:             * Specifies the modality of the dialog.
196:             * This method sets the modal property as specified by modal. A
197:             * Personal Profile implementation may optionally support non-modal
198:             * dialogs or not allow the modal property to be changed after the
199:             * dialog is created. isModal() may be called to verify the setting
200:             * of the modal property.
201:             * @param <code>modal</code> desired modality for the dialog
202:             * @see       java.awt.Dialog#isModal
203:             * @since     JDK1.1
204:             */
205:            public void setModal(boolean modal) {
206:                this .modal = modal;
207:                DialogXWindow xwindow = (DialogXWindow) this .xwindow;
208:                if (xwindow != null)
209:                    xwindow.setModal(modal);
210:            }
211:
212:            /**
213:             * Gets the title of the dialog.
214:             * @return    the title of this dialog window.
215:             * @see       java.awt.Dialog#setTitle
216:             * @since     JDK1.0
217:             */
218:            public String getTitle() {
219:                return title;
220:            }
221:
222:            /**
223:             * Sets the title of the Dialog.
224:             * @param title the new title being given to the dialog
225:             * @see #getTitle
226:             * @since JDK1.0
227:             */
228:            public synchronized void setTitle(String title) {
229:                this .title = title;
230:                DialogXWindow xwindow = (DialogXWindow) this .xwindow;
231:                if (xwindow != null)
232:                    xwindow.setTitle(title);
233:            }
234:
235:            ComponentXWindow createXWindow() {
236:                return new DialogXWindow(this );
237:            }
238:
239:            /**
240:             * @return true if we actually showed, false if we just called toFront()
241:             */
242:            private boolean conditionalShow() {
243:                boolean retval;
244:                synchronized (getTreeLock()) {
245:                    if (xwindow == null) {
246:                        addNotify();
247:                    }
248:                    validate();
249:                    if (visible) {
250:                        toFront();
251:                        retval = false;
252:                    } else {
253:                        visible = retval = true;
254:                        xwindow.map(); // now guaranteed never to block
255:                        //		createHierarchyEvents(HierarchyEvent.HIERARCHY_CHANGED,
256:                        //				      this, parent,
257:                        //				      HierarchyEvent.SHOWING_CHANGED);
258:                    }
259:                    if (retval
260:                            && (componentListener != null || (eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0)) {
261:                        ComponentEvent e = new ComponentEvent(this ,
262:                                ComponentEvent.COMPONENT_SHOWN);
263:                        Toolkit.getEventQueue().postEvent(e);
264:                    }
265:                }
266:                if (retval && (state & OPENED) == 0) {
267:                    postWindowEvent(WindowEvent.WINDOW_OPENED);
268:                    state |= OPENED;
269:                }
270:                return retval;
271:            }
272:
273:            /**
274:             * Makes this dialog visible and in front of all windows.
275:             * This method calls the dialog's addNotify() method,
276:             * validates the dialog's layout, and makes the dialog visible.
277:             * <p>
278:             * If the dialog is modal, show() will not return until the
279:             * dialog is no longer visible.
280:             * <p>
281:             * A Personal Profile or Personal Java implementation is not
282:             * required to support multiple modal dialogs. In this case, if
283:             * there is a previous modal dialog being shown, it can be hidden
284:             * until this Dialog is made invisible via setVisible() or dispose().
285:             * This must work recursively to allow for multiple nested modal dialogs.
286:             * @see Component#setVisible
287:             * @since JDK1.0
288:             */
289:            public void show() {
290:                if (!isModal()) {
291:                    conditionalShow();
292:                } else {
293:                    // Set this variable before calling conditionalShow(). That
294:                    // way, if the Dialog is hidden right after being shown, we
295:                    // won't mistakenly block this thread.
296:                    keepBlocking = true;
297:                    if (conditionalShow()) {
298:                        // We have two mechanisms for blocking: 1. If we're on the
299:                        // EventDispatchThread, start a new event pump. 2. If we're
300:                        // on any other thread, call wait() on the treelock.
301:
302:                        if (Toolkit.getEventQueue().isDispatchThread()) {
303:                            EventDispatchThread dispatchThread = (EventDispatchThread) Thread
304:                                    .currentThread();
305:                            dispatchThread.pumpEvents(new Conditional() {
306:                                public boolean evaluate() {
307:                                    return keepBlocking
308:                                            && windowClosingException == null;
309:                                }
310:                            });
311:                        } else {
312:                            synchronized (getTreeLock()) {
313:                                while (keepBlocking
314:                                        && windowClosingException == null) {
315:                                    try {
316:                                        getTreeLock().wait();
317:                                    } catch (InterruptedException e) {
318:                                        break;
319:                                    }
320:                                }
321:                            }
322:                        }
323:                        if (windowClosingException != null) {
324:                            windowClosingException.fillInStackTrace();
325:                            throw windowClosingException;
326:                        }
327:                    }
328:                }
329:            }
330:
331:            private void hideAndDisposeHandler() {
332:                if (keepBlocking) {
333:                    synchronized (getTreeLock()) {
334:                        keepBlocking = false;
335:                        EventQueue.invokeLater(new Runnable() {
336:                            public void run() {
337:                            }
338:                        });
339:                        getTreeLock().notifyAll();
340:                    }
341:                }
342:            }
343:
344:            /**
345:             * Hides the Dialog and then causes show() to return if it is currently
346:             * blocked.
347:             */
348:            public void hide() {
349:                super .hide();
350:                hideAndDisposeHandler();
351:            }
352:
353:            /**
354:             * Disposes the Dialog and then causes show() to return if it is currently
355:             * blocked.
356:             */
357:            public void dispose() {
358:                super .dispose();
359:                hideAndDisposeHandler();
360:            }
361:
362:            /**
363:             * Indicates whether this dialog window is resizable.
364:             * @return    <code>true</code> if the user can resize the dialog;
365:             *            <code>false</code> otherwise.
366:             * @see       java.awt.Dialog#setResizable
367:             * @since     JDK1.0
368:             */
369:            public boolean isResizable() {
370:                return resizable;
371:            }
372:
373:            /**
374:             * Sets the Resizable property of the dialog.
375:             * This method sets the resizable property of the dialog. A
376:             * dilaog that is resizable may be resized by the user.  In Personal
377:             * Profile, this method may have no effect, it may be verified with
378:             * the isResizable() method.
379:             * @param     resizable <code>true</code> if the user can
380:             *                 resize this dialog; <code>false</code> otherwise.
381:             * @see       java.awt.Dialog#isResizable
382:             * @since     JDK1.0
383:             */
384:            public synchronized void setResizable(boolean resizable) {
385:                this .resizable = resizable;
386:                DialogXWindow xwindow = (DialogXWindow) this .xwindow;
387:                if (xwindow != null)
388:                    xwindow.setResizable(resizable);
389:            }
390:
391:            /**
392:             * Returns the parameter string representing the state of this
393:             * dialog window. This string is useful for debugging.
394:             * @return    the parameter string of this dialog window.
395:             * @since     JDK1.0
396:             */
397:            protected String paramString() {
398:                String str = super .paramString()
399:                        + (modal ? ",modal" : ",modeless");
400:                if (title != null) {
401:                    str += ",title=" + title;
402:                }
403:                return str;
404:            }
405:
406:            private void readObject(ObjectInputStream s)
407:                    throws ClassNotFoundException, IOException {
408:                s.defaultReadObject();
409:                setModal(this.modal);
410:            }
411:        }
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