001/* Dialog.java -- An AWT dialog box 002 Copyright (C) 1999, 2000, 2001, 2002, 2005, 2006 003 Free Software Foundation, Inc. 004 005 This file is part of GNU Classpath. 006 007 GNU Classpath is free software; you can redistribute it and/or modify 008 it under the terms of the GNU General Public License as published by 009 the Free Software Foundation; either version 2, or (at your option) 010 any later version. 011 012 GNU Classpath is distributed in the hope that it will be useful, but 013 WITHOUT ANY WARRANTY; without even the implied warranty of 014 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 015 General Public License for more details. 016 017 You should have received a copy of the GNU General Public License 018 along with GNU Classpath; see the file COPYING. If not, write to the 019 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 020 02110-1301 USA. 021 022 Linking this library statically or dynamically with other modules is 023 making a combined work based on this library. Thus, the terms and 024 conditions of the GNU General Public License cover the whole 025 combination. 026 027 As a special exception, the copyright holders of this library give you 028 permission to link this library with independent modules to produce an 029 executable, regardless of the license terms of these independent 030 modules, and to copy and distribute the resulting executable under 031 terms of your choice, provided that you also meet, for each linked 032 independent module, the terms and conditions of the license of that 033 module. An independent module is a module which is not derived from 034 or based on this library. If you modify this library, you may extend 035 this exception to your version of the library, but you are not 036 obligated to do so. If you do not wish to do so, delete this 037 exception statement from your version. */ 038 039 040package java.awt; 041 042import java.awt.peer.DialogPeer; 043 044import javax.accessibility.AccessibleContext; 045import javax.accessibility.AccessibleRole; 046import javax.accessibility.AccessibleState; 047import javax.accessibility.AccessibleStateSet; 048 049/** 050 * <code>Dialog</code> provides a top-level window normally used to receive 051 * user input in applications. 052 * <p> 053 * A dialog always has another top-level window as owner and is only visible 054 * if this owner is visible to the user. The default layout of dialogs is the 055 * <code>BorderLayout</code>. Dialogs can be modal (blocks user input to other 056 * components) or non-modal (user input in other components are allowed). 057 * </p> 058 * 059 * @author Aaron M. Renn (arenn@urbanophile.com) 060 * @author Tom Tromey (tromey@redhat.com) 061 */ 062public class Dialog extends Window 063{ 064 public enum ModalExclusionType 065 { 066 APPLICATION_EXCLUDE, 067 NO_EXCLUDE, 068 TOOLKIT_EXCLUDE 069 } 070 071 public enum ModalityType 072 { 073 APPLICATION_MODAL, 074 DOCUMENT_MODAL, 075 MODELESS, 076 TOOLKIT_MODAL 077 } 078 079 // Serialization constant 080 private static final long serialVersionUID = 5920926903803293709L; 081 082 /** 083 * @serial Indicates whether or not this dialog box is modal. 084 */ 085 private boolean modal; 086 087 /** 088 * @serial Indicates whether or not this dialog box is resizable. 089 */ 090 private boolean resizable = true; 091 092 /** 093 * @serial The title string for this dialog box, which can be 094 * <code>null</code>. 095 */ 096 private String title; 097 098 /** 099 * This field indicates whether the dialog is undecorated or not. 100 */ 101 private boolean undecorated = false; 102 103 /** 104 * Indicates that we are blocked for modality in show 105 */ 106 private boolean blocked = false; 107 108 /** 109 * Secondary EventQueue to handle AWT events while we are blocked for 110 * modality in show. 111 */ 112 private EventQueue eq2 = null; 113 114 /** 115 * The number used to generate the name returned by getName. 116 */ 117 private static transient long next_dialog_number; 118 119 /** 120 * Initializes a new instance of <code>Dialog</code> with the specified 121 * parent, that is resizable and not modal, and which has no title. 122 * 123 * @param parent The parent frame of this dialog box. 124 * @exception IllegalArgumentException If the owner's GraphicsConfiguration 125 * is not from a screen device, or if owner is null. This exception is 126 * always thrown when GraphicsEnvironment.isHeadless() returns true. 127 */ 128 public Dialog(Frame parent) 129 { 130 this(parent, "", false); 131 } 132 133 /** 134 * Initializes a new instance of <code>Dialog</code> with the specified 135 * parent and modality, that is resizable and which has no title. 136 * 137 * @param parent The parent frame of this dialog box. 138 * @param modal <code>true</code> if this dialog box is modal, 139 * <code>false</code> otherwise. 140 * 141 * @exception IllegalArgumentException If the owner's GraphicsConfiguration 142 * is not from a screen device, or if owner is null. This exception is 143 * always thrown when GraphicsEnvironment.isHeadless() returns true. 144 */ 145 public Dialog(Frame parent, boolean modal) 146 { 147 this(parent, "", modal); 148 } 149 150 /** 151 * Initializes a new instance of <code>Dialog</code> with the specified 152 * parent, that is resizable and not modal, and which has the specified 153 * title. 154 * 155 * @param parent The parent frame of this dialog box. 156 * @param title The title string for this dialog box. 157 * 158 * @exception IllegalArgumentException If the owner's GraphicsConfiguration 159 * is not from a screen device, or if owner is null. This exceptionnis 160 * always thrown when GraphicsEnvironment.isHeadless() returns true. 161 */ 162 public Dialog(Frame parent, String title) 163 { 164 this(parent, title, false); 165 } 166 167 /** 168 * Initializes a new instance of <code>Dialog</code> with the specified, 169 * parent, title, and modality, that is resizable. 170 * 171 * @param parent The parent frame of this dialog box. 172 * @param title The title string for this dialog box. 173 * @param modal <code>true</code> if this dialog box is modal, 174 * <code>false</code> otherwise. 175 * 176 * @exception IllegalArgumentException If owner is null or 177 * GraphicsEnvironment.isHeadless() returns true. 178 */ 179 public Dialog(Frame parent, String title, boolean modal) 180 { 181 this(parent, title, modal, parent.getGraphicsConfiguration()); 182 } 183 184 /** 185 * Initializes a new instance of <code>Dialog</code> with the specified, 186 * parent, title, modality and <code>GraphicsConfiguration</code>, that is 187 * resizable. 188 * 189 * @param parent The parent frame of this dialog box. 190 * @param title The title string for this dialog box. 191 * @param modal <code>true</code> if this dialog box is modal, 192 * <code>false</code> otherwise. 193 * @param gc The <code>GraphicsConfiguration</code> object to use. If 194 * <code>null</code> the <code>GraphicsConfiguration</code> of the target 195 * frame is used. 196 * 197 * @exception IllegalArgumentException If owner is null, the 198 * GraphicsConfiguration is not a screen device or 199 * GraphicsEnvironment.isHeadless() returns true. 200 * @since 1.4 201 */ 202 public Dialog(Frame parent, String title, boolean modal, 203 GraphicsConfiguration gc) 204 { 205 super(parent, (gc == null) ? parent.getGraphicsConfiguration() : gc); 206 207 // A null title is equivalent to an empty title 208 this.title = (title != null) ? title : ""; 209 this.modal = modal; 210 visible = false; 211 212 setLayout(new BorderLayout()); 213 setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); 214 } 215 216 /** 217 * Initializes a new instance of <code>Dialog</code> with the specified, 218 * parent, that is resizable. 219 * 220 * @param owner The parent frame of this dialog box. 221 * 222 * @exception IllegalArgumentException If parent is null. This exception is 223 * always thrown when GraphicsEnvironment.isHeadless() returns true. 224 * 225 * @since 1.2 226 */ 227 public Dialog(Dialog owner) 228 { 229 this(owner, "", false, owner.getGraphicsConfiguration()); 230 } 231 232 /** 233 * Initializes a new instance of <code>Dialog</code> with the specified, 234 * parent and title, that is resizable. 235 * 236 * @param owner The parent frame of this dialog box. 237 * @param title The title string for this dialog box. 238 * 239 * @exception IllegalArgumentException If parent is null. This exception is 240 * always thrown when GraphicsEnvironment.isHeadless() returns 241 * true. 242 * @since 1.2 243 */ 244 public Dialog(Dialog owner, String title) 245 { 246 this(owner, title, false, owner.getGraphicsConfiguration()); 247 } 248 249 /** 250 * Initializes a new instance of <code>Dialog</code> with the specified, 251 * parent, title and modality, that is resizable. 252 * 253 * @param owner The parent frame of this dialog box. 254 * @param title The title string for this dialog box. 255 * @param modal <code>true</code> if this dialog box is modal, 256 * <code>false</code> otherwise. 257 * 258 * @exception IllegalArgumentException If parent is null. This exception is 259 * always thrown when GraphicsEnvironment.isHeadless() returns true. 260 * @since 1.2 261 */ 262 public Dialog(Dialog owner, String title, boolean modal) 263 { 264 this(owner, title, modal, owner.getGraphicsConfiguration()); 265 } 266 267 /** 268 * Initializes a new instance of <code>Dialog</code> with the specified, 269 * parent, title, modality and <code>GraphicsConfiguration</code>, that is 270 * resizable. 271 * 272 * @param parent The parent frame of this dialog box. 273 * @param title The title string for this dialog box. 274 * @param modal <code>true</code> if this dialog box is modal, 275 * <code>false</code> otherwise. 276 * @param gc The <code>GraphicsConfiguration</code> object to use. If 277 * <code>null</code> the <code>GraphicsConfiguration</code> of the target 278 * frame is used. 279 * 280 * @exception IllegalArgumentException If parent is null, the 281 * GraphicsConfiguration is not a screen device or 282 * GraphicsEnvironment.isHeadless() returns true. 283 * 284 * @since 1.4 285 */ 286 public Dialog(Dialog parent, String title, boolean modal, 287 GraphicsConfiguration gc) 288 { 289 super(parent, (gc == null) ? parent.getGraphicsConfiguration() : gc); 290 291 // A null title is equivalent to an empty title 292 this.title = (title != null) ? title : ""; 293 this.modal = modal; 294 visible = false; 295 296 setLayout(new BorderLayout()); 297 setCursor(new Cursor(Cursor.DEFAULT_CURSOR)); 298 } 299 300 /** 301 * Returns the title of this dialog box. 302 * 303 * @return The title of this dialog box. 304 */ 305 public String getTitle() 306 { 307 return title; 308 } 309 310 /** 311 * Sets the title of this dialog box to the specified string. 312 * 313 * @param title the new title. If <code>null</code> an empty 314 * title will be set. 315 */ 316 public synchronized void setTitle(String title) 317 { 318 // A null title is equivalent to an empty title 319 this.title = (title != null) ? title : ""; 320 321 if (peer != null) 322 { 323 DialogPeer d = (DialogPeer) peer; 324 d.setTitle(title); 325 } 326 } 327 328 /** 329 * Tests whether or not this dialog box is modal. 330 * 331 * @return <code>true</code> if this dialog box is modal, <code>false</code> 332 * otherwise. 333 */ 334 public boolean isModal() 335 { 336 return modal; 337 } 338 339 /** 340 * Changes the modality of this dialog box. This can only be done before the 341 * peer is created. 342 * 343 * @param modal <code>true</code> to make this dialog box modal, 344 * <code>false</code> to make it non-modal. 345 */ 346 public void setModal(boolean modal) 347 { 348 this.modal = modal; 349 } 350 351 /** 352 * Tests whether or not this dialog box is resizable. 353 * 354 * @return <code>true</code> if this dialog is resizable, 355 * <code>false</code> otherwise. 356 */ 357 public boolean isResizable() 358 { 359 return resizable; 360 } 361 362 /** 363 * Changes the resizability of this dialog box. 364 * 365 * @param resizable <code>true</code> to make this dialog resizable, 366 * <code>false</code> to make it non-resizable. 367 */ 368 public synchronized void setResizable(boolean resizable) 369 { 370 this.resizable = resizable; 371 if (peer != null) 372 { 373 DialogPeer d = (DialogPeer) peer; 374 d.setResizable(resizable); 375 } 376 } 377 378 /** 379 * Creates this object's native peer. 380 */ 381 public synchronized void addNotify() 382 { 383 if (peer == null) 384 peer = getToolkit().createDialog(this); 385 super.addNotify(); 386 } 387 388 /** 389 * Makes this dialog visible and brings it to the front. If the dialog is 390 * modal and is not already visible, this call will not return until the 391 * dialog is hidden by someone calling hide or dispose. If this is the event 392 * dispatching thread we must ensure that another event thread runs while the 393 * one which invoked this method is blocked. 394 * 395 * @deprecated Use {@link Component#setVisible(boolean)} instead. 396 */ 397 public synchronized void show() 398 { 399 super.show(); 400 401 if (isModal()) 402 { 403 // If already shown (and blocked) just return 404 if (blocked) 405 return; 406 407 /* 408 * If show is called in the dispatch thread for a modal dialog it will 409 * block so we must run another thread so the events keep being 410 * dispatched. 411 */ 412 if (EventQueue.isDispatchThread()) 413 { 414 EventQueue eq = Toolkit.getDefaultToolkit().getSystemEventQueue(); 415 eq2 = new EventQueue(); 416 eq.push(eq2); 417 } 418 419 try 420 { 421 blocked = true; 422 wait(); 423 blocked = false; 424 } 425 catch (InterruptedException e) 426 { 427 blocked = false; 428 } 429 430 if (eq2 != null) 431 { 432 eq2.pop(); 433 eq2 = null; 434 } 435 } 436 } 437 438 /** 439 * Hides the Dialog and then causes show() to return if it is currently 440 * blocked. 441 * 442 * @deprecated Use {@link Component#setVisible(boolean)} instead. 443 */ 444 public synchronized void hide() 445 { 446 if (blocked) 447 { 448 notifyAll(); 449 } 450 451 super.hide(); 452 } 453 454 /** 455 * Disposes the Dialog and then causes show() to return if it is currently 456 * blocked. 457 */ 458 public synchronized void dispose() 459 { 460 if (blocked) 461 { 462 notifyAll(); 463 } 464 465 super.dispose(); 466 } 467 468 /** 469 * Returns a debugging string for this component. 470 * 471 * @return A debugging string for this component. 472 */ 473 protected String paramString() 474 { 475 return "title+" + title + ",modal=" + modal + ",resizable=" + resizable 476 + "," + super.paramString(); 477 } 478 479 /** 480 * Returns whether this frame is undecorated or not. 481 * 482 * @return <code>true</code> if this dialog is undecorated, 483 * <code>false</code> otherwise. 484 * 485 * @since 1.4 486 */ 487 public boolean isUndecorated() 488 { 489 return undecorated; 490 } 491 492 /** 493 * Disables or enables decorations for this frame. This method can only be 494 * called while the frame is not displayable. 495 * 496 * @param undecorated <code>true</code> to disable dialog decorations, 497 * <code>false</code> otherwise. 498 * 499 * @exception IllegalComponentStateException If this frame is displayable. 500 * @since 1.4 501 */ 502 public void setUndecorated(boolean undecorated) 503 { 504 if (isDisplayable()) 505 throw new IllegalComponentStateException(); 506 507 this.undecorated = undecorated; 508 } 509 510 /** 511 * Accessibility support for <code>Dialog</code>. 512 */ 513 protected class AccessibleAWTDialog 514 extends AccessibleAWTWindow 515 { 516 private static final long serialVersionUID = 4837230331833941201L; 517 518 /** 519 * Gets the role of this object. 520 * @return AccessibleRole.DIALOG 521 */ 522 public AccessibleRole getAccessibleRole() 523 { 524 return AccessibleRole.DIALOG; 525 } 526 527 /** 528 * Gets the state set of this object. 529 * @return The current state of this dialog. 530 */ 531 public AccessibleStateSet getAccessibleStateSet() 532 { 533 AccessibleStateSet states = super.getAccessibleStateSet(); 534 if (isResizable()) 535 states.add(AccessibleState.RESIZABLE); 536 if (isModal()) 537 states.add(AccessibleState.MODAL); 538 return states; 539 } 540 } 541 542 /** 543 * Gets the AccessibleContext associated with this <code>Dialog</code>. The 544 * context is created, if necessary. 545 * 546 * @return the associated context 547 */ 548 public AccessibleContext getAccessibleContext() 549 { 550 /* Create the context if this is the first request */ 551 if (accessibleContext == null) 552 accessibleContext = new AccessibleAWTDialog(); 553 return accessibleContext; 554 } 555 556 /** 557 * Generate a unique name for this <code>Dialog</code>. 558 * 559 * @return A unique name for this <code>Dialog</code>. 560 */ 561 String generateName() 562 { 563 return "dialog" + getUniqueLong(); 564 } 565 566 private static synchronized long getUniqueLong() 567 { 568 return next_dialog_number++; 569 } 570}