J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2006 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package javax.accessibility; |
| 27 | |
| 28 | import java.util.Locale; |
| 29 | import java.beans.PropertyChangeListener; |
| 30 | import java.beans.PropertyChangeSupport; |
| 31 | import java.beans.PropertyChangeEvent; |
| 32 | import java.awt.IllegalComponentStateException; |
| 33 | |
| 34 | /** |
| 35 | * AccessibleContext represents the minimum information all accessible objects |
| 36 | * return. This information includes the accessible name, description, role, |
| 37 | * and state of the object, as well as information about its parent and |
| 38 | * children. AccessibleContext also contains methods for |
| 39 | * obtaining more specific accessibility information about a component. |
| 40 | * If the component supports them, these methods will return an object that |
| 41 | * implements one or more of the following interfaces: |
| 42 | * <P><ul> |
| 43 | * <li>{@link AccessibleAction} - the object can perform one or more actions. |
| 44 | * This interface provides the standard mechanism for an assistive |
| 45 | * technology to determine what those actions are and tell the object |
| 46 | * to perform them. Any object that can be manipulated should |
| 47 | * support this interface. |
| 48 | * <li>{@link AccessibleComponent} - the object has a graphical representation. |
| 49 | * This interface provides the standard mechanism for an assistive |
| 50 | * technology to determine and set the graphical representation of the |
| 51 | * object. Any object that is rendered on the screen should support |
| 52 | * this interface. |
| 53 | * <li>{@link AccessibleSelection} - the object allows its children to be |
| 54 | * selected. This interface provides the standard mechanism for an |
| 55 | * assistive technology to determine the currently selected children of the object |
| 56 | * as well as modify its selection set. Any object that has children |
| 57 | * that can be selected should support this interface. |
| 58 | * <li>{@link AccessibleText} - the object presents editable textual information |
| 59 | * on the display. This interface provides the standard mechanism for |
| 60 | * an assistive technology to access that text via its content, attributes, |
| 61 | * and spatial location. Any object that contains editable text should |
| 62 | * support this interface. |
| 63 | * <li>{@link AccessibleValue} - the object supports a numerical value. This |
| 64 | * interface provides the standard mechanism for an assistive technology |
| 65 | * to determine and set the current value of the object, as well as obtain its |
| 66 | * minimum and maximum values. Any object that supports a numerical value |
| 67 | * should support this interface.</ul> |
| 68 | * |
| 69 | * |
| 70 | * @beaninfo |
| 71 | * attribute: isContainer false |
| 72 | * description: Minimal information that all accessible objects return |
| 73 | * |
| 74 | |
| 75 | * @author Peter Korn |
| 76 | * @author Hans Muller |
| 77 | * @author Willie Walker |
| 78 | * @author Lynn Monsanto |
| 79 | */ |
| 80 | public abstract class AccessibleContext { |
| 81 | |
| 82 | /** |
| 83 | * Constant used to determine when the accessibleName property has |
| 84 | * changed. The old value in the PropertyChangeEvent will be the old |
| 85 | * accessibleName and the new value will be the new accessibleName. |
| 86 | * |
| 87 | * @see #getAccessibleName |
| 88 | * @see #addPropertyChangeListener |
| 89 | */ |
| 90 | public static final String ACCESSIBLE_NAME_PROPERTY = "AccessibleName"; |
| 91 | |
| 92 | /** |
| 93 | * Constant used to determine when the accessibleDescription property has |
| 94 | * changed. The old value in the PropertyChangeEvent will be the |
| 95 | * old accessibleDescription and the new value will be the new |
| 96 | * accessibleDescription. |
| 97 | * |
| 98 | * @see #getAccessibleDescription |
| 99 | * @see #addPropertyChangeListener |
| 100 | */ |
| 101 | public static final String ACCESSIBLE_DESCRIPTION_PROPERTY = "AccessibleDescription"; |
| 102 | |
| 103 | /** |
| 104 | * Constant used to determine when the accessibleStateSet property has |
| 105 | * changed. The old value will be the old AccessibleState and the new |
| 106 | * value will be the new AccessibleState in the accessibleStateSet. |
| 107 | * For example, if a component that supports the vertical and horizontal |
| 108 | * states changes its orientation from vertical to horizontal, the old |
| 109 | * value will be AccessibleState.VERTICAL and the new value will be |
| 110 | * AccessibleState.HORIZONTAL. Please note that either value can also |
| 111 | * be null. For example, when a component changes from being enabled |
| 112 | * to disabled, the old value will be AccessibleState.ENABLED |
| 113 | * and the new value will be null. |
| 114 | * |
| 115 | * @see #getAccessibleStateSet |
| 116 | * @see AccessibleState |
| 117 | * @see AccessibleStateSet |
| 118 | * @see #addPropertyChangeListener |
| 119 | */ |
| 120 | public static final String ACCESSIBLE_STATE_PROPERTY = "AccessibleState"; |
| 121 | |
| 122 | /** |
| 123 | * Constant used to determine when the accessibleValue property has |
| 124 | * changed. The old value in the PropertyChangeEvent will be a Number |
| 125 | * representing the old value and the new value will be a Number |
| 126 | * representing the new value |
| 127 | * |
| 128 | * @see #getAccessibleValue |
| 129 | * @see #addPropertyChangeListener |
| 130 | */ |
| 131 | public static final String ACCESSIBLE_VALUE_PROPERTY = "AccessibleValue"; |
| 132 | |
| 133 | /** |
| 134 | * Constant used to determine when the accessibleSelection has changed. |
| 135 | * The old and new values in the PropertyChangeEvent are currently |
| 136 | * reserved for future use. |
| 137 | * |
| 138 | * @see #getAccessibleSelection |
| 139 | * @see #addPropertyChangeListener |
| 140 | */ |
| 141 | public static final String ACCESSIBLE_SELECTION_PROPERTY = "AccessibleSelection"; |
| 142 | |
| 143 | /** |
| 144 | * Constant used to determine when the accessibleText caret has changed. |
| 145 | * The old value in the PropertyChangeEvent will be an |
| 146 | * integer representing the old caret position, and the new value will |
| 147 | * be an integer representing the new/current caret position. |
| 148 | * |
| 149 | * @see #addPropertyChangeListener |
| 150 | */ |
| 151 | public static final String ACCESSIBLE_CARET_PROPERTY = "AccessibleCaret"; |
| 152 | |
| 153 | /** |
| 154 | * Constant used to determine when the visual appearance of the object |
| 155 | * has changed. The old and new values in the PropertyChangeEvent are |
| 156 | * currently reserved for future use. |
| 157 | * |
| 158 | * @see #addPropertyChangeListener |
| 159 | */ |
| 160 | public static final String ACCESSIBLE_VISIBLE_DATA_PROPERTY = "AccessibleVisibleData"; |
| 161 | |
| 162 | /** |
| 163 | * Constant used to determine when Accessible children are added/removed |
| 164 | * from the object. If an Accessible child is being added, the old |
| 165 | * value will be null and the new value will be the Accessible child. If an |
| 166 | * Accessible child is being removed, the old value will be the Accessible |
| 167 | * child, and the new value will be null. |
| 168 | * |
| 169 | * @see #addPropertyChangeListener |
| 170 | */ |
| 171 | public static final String ACCESSIBLE_CHILD_PROPERTY = "AccessibleChild"; |
| 172 | |
| 173 | /** |
| 174 | * Constant used to determine when the active descendant of a component |
| 175 | * has changed. The active descendant is used for objects such as |
| 176 | * list, tree, and table, which may have transient children. When the |
| 177 | * active descendant has changed, the old value of the property change |
| 178 | * event will be the Accessible representing the previous active child, and |
| 179 | * the new value will be the Accessible representing the current active |
| 180 | * child. |
| 181 | * |
| 182 | * @see #addPropertyChangeListener |
| 183 | */ |
| 184 | public static final String ACCESSIBLE_ACTIVE_DESCENDANT_PROPERTY = "AccessibleActiveDescendant"; |
| 185 | |
| 186 | /** |
| 187 | * Constant used to indicate that the table caption has changed |
| 188 | * The old value in the PropertyChangeEvent will be an Accessible |
| 189 | * representing the previous table caption and the new value will |
| 190 | * be an Accessible representing the new table caption. |
| 191 | * @see Accessible |
| 192 | * @see AccessibleTable |
| 193 | */ |
| 194 | public static final String ACCESSIBLE_TABLE_CAPTION_CHANGED = |
| 195 | "accessibleTableCaptionChanged"; |
| 196 | |
| 197 | /** |
| 198 | * Constant used to indicate that the table summary has changed |
| 199 | * The old value in the PropertyChangeEvent will be an Accessible |
| 200 | * representing the previous table summary and the new value will |
| 201 | * be an Accessible representing the new table summary. |
| 202 | * @see Accessible |
| 203 | * @see AccessibleTable |
| 204 | */ |
| 205 | public static final String ACCESSIBLE_TABLE_SUMMARY_CHANGED = |
| 206 | "accessibleTableSummaryChanged"; |
| 207 | |
| 208 | /** |
| 209 | * Constant used to indicate that table data has changed. |
| 210 | * The old value in the PropertyChangeEvent will be null and the |
| 211 | * new value will be an AccessibleTableModelChange representing |
| 212 | * the table change. |
| 213 | * @see AccessibleTable |
| 214 | * @see AccessibleTableModelChange |
| 215 | */ |
| 216 | public static final String ACCESSIBLE_TABLE_MODEL_CHANGED = |
| 217 | "accessibleTableModelChanged"; |
| 218 | |
| 219 | /** |
| 220 | * Constant used to indicate that the row header has changed |
| 221 | * The old value in the PropertyChangeEvent will be null and the |
| 222 | * new value will be an AccessibleTableModelChange representing |
| 223 | * the header change. |
| 224 | * @see AccessibleTable |
| 225 | * @see AccessibleTableModelChange |
| 226 | */ |
| 227 | public static final String ACCESSIBLE_TABLE_ROW_HEADER_CHANGED = |
| 228 | "accessibleTableRowHeaderChanged"; |
| 229 | |
| 230 | /** |
| 231 | * Constant used to indicate that the row description has changed |
| 232 | * The old value in the PropertyChangeEvent will be null and the |
| 233 | * new value will be an Integer representing the row index. |
| 234 | * @see AccessibleTable |
| 235 | */ |
| 236 | public static final String ACCESSIBLE_TABLE_ROW_DESCRIPTION_CHANGED = |
| 237 | "accessibleTableRowDescriptionChanged"; |
| 238 | |
| 239 | /** |
| 240 | * Constant used to indicate that the column header has changed |
| 241 | * The old value in the PropertyChangeEvent will be null and the |
| 242 | * new value will be an AccessibleTableModelChange representing |
| 243 | * the header change. |
| 244 | * @see AccessibleTable |
| 245 | * @see AccessibleTableModelChange |
| 246 | */ |
| 247 | public static final String ACCESSIBLE_TABLE_COLUMN_HEADER_CHANGED = |
| 248 | "accessibleTableColumnHeaderChanged"; |
| 249 | |
| 250 | /** |
| 251 | * Constant used to indicate that the column description has changed |
| 252 | * The old value in the PropertyChangeEvent will be null and the |
| 253 | * new value will be an Integer representing the column index. |
| 254 | * @see AccessibleTable |
| 255 | */ |
| 256 | public static final String ACCESSIBLE_TABLE_COLUMN_DESCRIPTION_CHANGED = |
| 257 | "accessibleTableColumnDescriptionChanged"; |
| 258 | |
| 259 | /** |
| 260 | * Constant used to indicate that the supported set of actions |
| 261 | * has changed. The old value in the PropertyChangeEvent will |
| 262 | * be an Integer representing the old number of actions supported |
| 263 | * and the new value will be an Integer representing the new |
| 264 | * number of actions supported. |
| 265 | * @see AccessibleAction |
| 266 | */ |
| 267 | public static final String ACCESSIBLE_ACTION_PROPERTY = |
| 268 | "accessibleActionProperty"; |
| 269 | |
| 270 | /** |
| 271 | * Constant used to indicate that a hypertext element has received focus. |
| 272 | * The old value in the PropertyChangeEvent will be an Integer |
| 273 | * representing the start index in the document of the previous element |
| 274 | * that had focus and the new value will be an Integer representing |
| 275 | * the start index in the document of the current element that has |
| 276 | * focus. A value of -1 indicates that an element does not or did |
| 277 | * not have focus. |
| 278 | * @see AccessibleHyperlink |
| 279 | */ |
| 280 | public static final String ACCESSIBLE_HYPERTEXT_OFFSET = |
| 281 | "AccessibleHypertextOffset"; |
| 282 | |
| 283 | /** |
| 284 | * PropertyChangeEvent which indicates that text has changed. |
| 285 | * <br> |
| 286 | * For text insertion, the oldValue is null and the newValue |
| 287 | * is an AccessibleTextSequence specifying the text that was |
| 288 | * inserted. |
| 289 | * <br> |
| 290 | * For text deletion, the oldValue is an AccessibleTextSequence |
| 291 | * specifying the text that was deleted and the newValue is null. |
| 292 | * <br> |
| 293 | * For text replacement, the oldValue is an AccessibleTextSequence |
| 294 | * specifying the old text and the newValue is an AccessibleTextSequence |
| 295 | * specifying the new text. |
| 296 | * |
| 297 | * @see #getAccessibleText |
| 298 | * @see #addPropertyChangeListener |
| 299 | * @see #AccessibleText.AccessibleTextSequence |
| 300 | */ |
| 301 | public static final String ACCESSIBLE_TEXT_PROPERTY |
| 302 | = "AccessibleText"; |
| 303 | |
| 304 | /** |
| 305 | * PropertyChangeEvent which indicates that a significant change |
| 306 | * has occurred to the children of a component like a tree or text. |
| 307 | * This change notifies the event listener that it needs to |
| 308 | * reacquire the state of the subcomponents. The oldValue is |
| 309 | * null and the newValue is the component whose children have |
| 310 | * become invalid. |
| 311 | * |
| 312 | * @see #getAccessibleText |
| 313 | * @see #addPropertyChangeListener |
| 314 | * @see #AccessibleText.AccessibleTextSequence |
| 315 | * |
| 316 | * @since 1.5 |
| 317 | */ |
| 318 | public static final String ACCESSIBLE_INVALIDATE_CHILDREN = |
| 319 | "accessibleInvalidateChildren"; |
| 320 | |
| 321 | /** |
| 322 | * PropertyChangeEvent which indicates that text attributes have changed. |
| 323 | * <br> |
| 324 | * For attribute insertion, the oldValue is null and the newValue |
| 325 | * is an AccessibleAttributeSequence specifying the attributes that were |
| 326 | * inserted. |
| 327 | * <br> |
| 328 | * For attribute deletion, the oldValue is an AccessibleAttributeSequence |
| 329 | * specifying the attributes that were deleted and the newValue is null. |
| 330 | * <br> |
| 331 | * For attribute replacement, the oldValue is an AccessibleAttributeSequence |
| 332 | * specifying the old attributes and the newValue is an |
| 333 | * AccessibleAttributeSequence specifying the new attributes. |
| 334 | * |
| 335 | * @see #getAccessibleText |
| 336 | * @see #addPropertyChangeListener |
| 337 | * @see #AccessibleText.AccessibleAttributeSequence |
| 338 | * |
| 339 | * @since 1.5 |
| 340 | */ |
| 341 | public static final String ACCESSIBLE_TEXT_ATTRIBUTES_CHANGED = |
| 342 | "accessibleTextAttributesChanged"; |
| 343 | |
| 344 | /** |
| 345 | * PropertyChangeEvent which indicates that a change has occurred |
| 346 | * in a component's bounds. |
| 347 | * The oldValue is the old component bounds and the newValue is |
| 348 | * the new component bounds. |
| 349 | * |
| 350 | * @see #addPropertyChangeListener |
| 351 | * |
| 352 | * @since 1.5 |
| 353 | */ |
| 354 | public static final String ACCESSIBLE_COMPONENT_BOUNDS_CHANGED = |
| 355 | "accessibleComponentBoundsChanged"; |
| 356 | |
| 357 | /** |
| 358 | * The accessible parent of this object. |
| 359 | * |
| 360 | * @see #getAccessibleParent |
| 361 | * @see #setAccessibleParent |
| 362 | */ |
| 363 | protected Accessible accessibleParent = null; |
| 364 | |
| 365 | /** |
| 366 | * A localized String containing the name of the object. |
| 367 | * |
| 368 | * @see #getAccessibleName |
| 369 | * @see #setAccessibleName |
| 370 | */ |
| 371 | protected String accessibleName = null; |
| 372 | |
| 373 | /** |
| 374 | * A localized String containing the description of the object. |
| 375 | * |
| 376 | * @see #getAccessibleDescription |
| 377 | * @see #setAccessibleDescription |
| 378 | */ |
| 379 | protected String accessibleDescription = null; |
| 380 | |
| 381 | /** |
| 382 | * Used to handle the listener list for property change events. |
| 383 | * |
| 384 | * @see #addPropertyChangeListener |
| 385 | * @see #removePropertyChangeListener |
| 386 | * @see #firePropertyChangeListener |
| 387 | */ |
| 388 | private PropertyChangeSupport accessibleChangeSupport = null; |
| 389 | |
| 390 | /** |
| 391 | * Used to represent the context's relation set |
| 392 | * @see #getAccessibleRelationSet |
| 393 | */ |
| 394 | private AccessibleRelationSet relationSet |
| 395 | = new AccessibleRelationSet(); |
| 396 | |
| 397 | /** |
| 398 | * Gets the accessibleName property of this object. The accessibleName |
| 399 | * property of an object is a localized String that designates the purpose |
| 400 | * of the object. For example, the accessibleName property of a label |
| 401 | * or button might be the text of the label or button itself. In the |
| 402 | * case of an object that doesn't display its name, the accessibleName |
| 403 | * should still be set. For example, in the case of a text field used |
| 404 | * to enter the name of a city, the accessibleName for the en_US locale |
| 405 | * could be 'city.' |
| 406 | * |
| 407 | * @return the localized name of the object; null if this |
| 408 | * object does not have a name |
| 409 | * |
| 410 | * @see #setAccessibleName |
| 411 | */ |
| 412 | public String getAccessibleName() { |
| 413 | return accessibleName; |
| 414 | } |
| 415 | |
| 416 | /** |
| 417 | * Sets the localized accessible name of this object. Changing the |
| 418 | * name will cause a PropertyChangeEvent to be fired for the |
| 419 | * ACCESSIBLE_NAME_PROPERTY property. |
| 420 | * |
| 421 | * @param s the new localized name of the object. |
| 422 | * |
| 423 | * @see #getAccessibleName |
| 424 | * @see #addPropertyChangeListener |
| 425 | * |
| 426 | * @beaninfo |
| 427 | * preferred: true |
| 428 | * description: Sets the accessible name for the component. |
| 429 | */ |
| 430 | public void setAccessibleName(String s) { |
| 431 | String oldName = accessibleName; |
| 432 | accessibleName = s; |
| 433 | firePropertyChange(ACCESSIBLE_NAME_PROPERTY,oldName,accessibleName); |
| 434 | } |
| 435 | |
| 436 | /** |
| 437 | * Gets the accessibleDescription property of this object. The |
| 438 | * accessibleDescription property of this object is a short localized |
| 439 | * phrase describing the purpose of the object. For example, in the |
| 440 | * case of a 'Cancel' button, the accessibleDescription could be |
| 441 | * 'Ignore changes and close dialog box.' |
| 442 | * |
| 443 | * @return the localized description of the object; null if |
| 444 | * this object does not have a description |
| 445 | * |
| 446 | * @see #setAccessibleDescription |
| 447 | */ |
| 448 | public String getAccessibleDescription() { |
| 449 | return accessibleDescription; |
| 450 | } |
| 451 | |
| 452 | /** |
| 453 | * Sets the accessible description of this object. Changing the |
| 454 | * name will cause a PropertyChangeEvent to be fired for the |
| 455 | * ACCESSIBLE_DESCRIPTION_PROPERTY property. |
| 456 | * |
| 457 | * @param s the new localized description of the object |
| 458 | * |
| 459 | * @see #setAccessibleName |
| 460 | * @see #addPropertyChangeListener |
| 461 | * |
| 462 | * @beaninfo |
| 463 | * preferred: true |
| 464 | * description: Sets the accessible description for the component. |
| 465 | */ |
| 466 | public void setAccessibleDescription(String s) { |
| 467 | String oldDescription = accessibleDescription; |
| 468 | accessibleDescription = s; |
| 469 | firePropertyChange(ACCESSIBLE_DESCRIPTION_PROPERTY, |
| 470 | oldDescription,accessibleDescription); |
| 471 | } |
| 472 | |
| 473 | /** |
| 474 | * Gets the role of this object. The role of the object is the generic |
| 475 | * purpose or use of the class of this object. For example, the role |
| 476 | * of a push button is AccessibleRole.PUSH_BUTTON. The roles in |
| 477 | * AccessibleRole are provided so component developers can pick from |
| 478 | * a set of predefined roles. This enables assistive technologies to |
| 479 | * provide a consistent interface to various tweaked subclasses of |
| 480 | * components (e.g., use AccessibleRole.PUSH_BUTTON for all components |
| 481 | * that act like a push button) as well as distinguish between sublasses |
| 482 | * that behave differently (e.g., AccessibleRole.CHECK_BOX for check boxes |
| 483 | * and AccessibleRole.RADIO_BUTTON for radio buttons). |
| 484 | * <p>Note that the AccessibleRole class is also extensible, so |
| 485 | * custom component developers can define their own AccessibleRole's |
| 486 | * if the set of predefined roles is inadequate. |
| 487 | * |
| 488 | * @return an instance of AccessibleRole describing the role of the object |
| 489 | * @see AccessibleRole |
| 490 | */ |
| 491 | public abstract AccessibleRole getAccessibleRole(); |
| 492 | |
| 493 | /** |
| 494 | * Gets the state set of this object. The AccessibleStateSet of an object |
| 495 | * is composed of a set of unique AccessibleStates. A change in the |
| 496 | * AccessibleStateSet of an object will cause a PropertyChangeEvent to |
| 497 | * be fired for the ACCESSIBLE_STATE_PROPERTY property. |
| 498 | * |
| 499 | * @return an instance of AccessibleStateSet containing the |
| 500 | * current state set of the object |
| 501 | * @see AccessibleStateSet |
| 502 | * @see AccessibleState |
| 503 | * @see #addPropertyChangeListener |
| 504 | */ |
| 505 | public abstract AccessibleStateSet getAccessibleStateSet(); |
| 506 | |
| 507 | /** |
| 508 | * Gets the Accessible parent of this object. |
| 509 | * |
| 510 | * @return the Accessible parent of this object; null if this |
| 511 | * object does not have an Accessible parent |
| 512 | */ |
| 513 | public Accessible getAccessibleParent() { |
| 514 | return accessibleParent; |
| 515 | } |
| 516 | |
| 517 | /** |
| 518 | * Sets the Accessible parent of this object. This is meant to be used |
| 519 | * only in the situations where the actual component's parent should |
| 520 | * not be treated as the component's accessible parent and is a method |
| 521 | * that should only be called by the parent of the accessible child. |
| 522 | * |
| 523 | * @param a - Accessible to be set as the parent |
| 524 | */ |
| 525 | public void setAccessibleParent(Accessible a) { |
| 526 | accessibleParent = a; |
| 527 | } |
| 528 | |
| 529 | /** |
| 530 | * Gets the 0-based index of this object in its accessible parent. |
| 531 | * |
| 532 | * @return the 0-based index of this object in its parent; -1 if this |
| 533 | * object does not have an accessible parent. |
| 534 | * |
| 535 | * @see #getAccessibleParent |
| 536 | * @see #getAccessibleChildrenCount |
| 537 | * @see #getAccessibleChild |
| 538 | */ |
| 539 | public abstract int getAccessibleIndexInParent(); |
| 540 | |
| 541 | /** |
| 542 | * Returns the number of accessible children of the object. |
| 543 | * |
| 544 | * @return the number of accessible children of the object. |
| 545 | */ |
| 546 | public abstract int getAccessibleChildrenCount(); |
| 547 | |
| 548 | /** |
| 549 | * Returns the specified Accessible child of the object. The Accessible |
| 550 | * children of an Accessible object are zero-based, so the first child |
| 551 | * of an Accessible child is at index 0, the second child is at index 1, |
| 552 | * and so on. |
| 553 | * |
| 554 | * @param i zero-based index of child |
| 555 | * @return the Accessible child of the object |
| 556 | * @see #getAccessibleChildrenCount |
| 557 | */ |
| 558 | public abstract Accessible getAccessibleChild(int i); |
| 559 | |
| 560 | /** |
| 561 | * Gets the locale of the component. If the component does not have a |
| 562 | * locale, then the locale of its parent is returned. |
| 563 | * |
| 564 | * @return this component's locale. If this component does not have |
| 565 | * a locale, the locale of its parent is returned. |
| 566 | * |
| 567 | * @exception IllegalComponentStateException |
| 568 | * If the Component does not have its own locale and has not yet been |
| 569 | * added to a containment hierarchy such that the locale can be |
| 570 | * determined from the containing parent. |
| 571 | */ |
| 572 | public abstract Locale getLocale() throws IllegalComponentStateException; |
| 573 | |
| 574 | /** |
| 575 | * Adds a PropertyChangeListener to the listener list. |
| 576 | * The listener is registered for all Accessible properties and will |
| 577 | * be called when those properties change. |
| 578 | * |
| 579 | * @see #ACCESSIBLE_NAME_PROPERTY |
| 580 | * @see #ACCESSIBLE_DESCRIPTION_PROPERTY |
| 581 | * @see #ACCESSIBLE_STATE_PROPERTY |
| 582 | * @see #ACCESSIBLE_VALUE_PROPERTY |
| 583 | * @see #ACCESSIBLE_SELECTION_PROPERTY |
| 584 | * @see #ACCESSIBLE_TEXT_PROPERTY |
| 585 | * @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY |
| 586 | * |
| 587 | * @param listener The PropertyChangeListener to be added |
| 588 | */ |
| 589 | public void addPropertyChangeListener(PropertyChangeListener listener) { |
| 590 | if (accessibleChangeSupport == null) { |
| 591 | accessibleChangeSupport = new PropertyChangeSupport(this); |
| 592 | } |
| 593 | accessibleChangeSupport.addPropertyChangeListener(listener); |
| 594 | } |
| 595 | |
| 596 | /** |
| 597 | * Removes a PropertyChangeListener from the listener list. |
| 598 | * This removes a PropertyChangeListener that was registered |
| 599 | * for all properties. |
| 600 | * |
| 601 | * @param listener The PropertyChangeListener to be removed |
| 602 | */ |
| 603 | public void removePropertyChangeListener(PropertyChangeListener listener) { |
| 604 | if (accessibleChangeSupport != null) { |
| 605 | accessibleChangeSupport.removePropertyChangeListener(listener); |
| 606 | } |
| 607 | } |
| 608 | |
| 609 | /** |
| 610 | * Gets the AccessibleAction associated with this object that supports |
| 611 | * one or more actions. |
| 612 | * |
| 613 | * @return AccessibleAction if supported by object; else return null |
| 614 | * @see AccessibleAction |
| 615 | */ |
| 616 | public AccessibleAction getAccessibleAction() { |
| 617 | return null; |
| 618 | } |
| 619 | |
| 620 | /** |
| 621 | * Gets the AccessibleComponent associated with this object that has a |
| 622 | * graphical representation. |
| 623 | * |
| 624 | * @return AccessibleComponent if supported by object; else return null |
| 625 | * @see AccessibleComponent |
| 626 | */ |
| 627 | public AccessibleComponent getAccessibleComponent() { |
| 628 | return null; |
| 629 | } |
| 630 | |
| 631 | /** |
| 632 | * Gets the AccessibleSelection associated with this object which allows its |
| 633 | * Accessible children to be selected. |
| 634 | * |
| 635 | * @return AccessibleSelection if supported by object; else return null |
| 636 | * @see AccessibleSelection |
| 637 | */ |
| 638 | public AccessibleSelection getAccessibleSelection() { |
| 639 | return null; |
| 640 | } |
| 641 | |
| 642 | /** |
| 643 | * Gets the AccessibleText associated with this object presenting |
| 644 | * text on the display. |
| 645 | * |
| 646 | * @return AccessibleText if supported by object; else return null |
| 647 | * @see AccessibleText |
| 648 | */ |
| 649 | public AccessibleText getAccessibleText() { |
| 650 | return null; |
| 651 | } |
| 652 | |
| 653 | /** |
| 654 | * Gets the AccessibleEditableText associated with this object |
| 655 | * presenting editable text on the display. |
| 656 | * |
| 657 | * @return AccessibleEditableText if supported by object; else return null |
| 658 | * @see AccessibleEditableText |
| 659 | * @since 1.4 |
| 660 | */ |
| 661 | public AccessibleEditableText getAccessibleEditableText() { |
| 662 | return null; |
| 663 | } |
| 664 | |
| 665 | |
| 666 | /** |
| 667 | * Gets the AccessibleValue associated with this object that supports a |
| 668 | * Numerical value. |
| 669 | * |
| 670 | * @return AccessibleValue if supported by object; else return null |
| 671 | * @see AccessibleValue |
| 672 | */ |
| 673 | public AccessibleValue getAccessibleValue() { |
| 674 | return null; |
| 675 | } |
| 676 | |
| 677 | /** |
| 678 | * Gets the AccessibleIcons associated with an object that has |
| 679 | * one or more associated icons |
| 680 | * |
| 681 | * @return an array of AccessibleIcon if supported by object; |
| 682 | * otherwise return null |
| 683 | * @see AccessibleIcon |
| 684 | * @since 1.3 |
| 685 | */ |
| 686 | public AccessibleIcon [] getAccessibleIcon() { |
| 687 | return null; |
| 688 | } |
| 689 | |
| 690 | /** |
| 691 | * Gets the AccessibleRelationSet associated with an object |
| 692 | * |
| 693 | * @return an AccessibleRelationSet if supported by object; |
| 694 | * otherwise return null |
| 695 | * @see AccessibleRelationSet |
| 696 | * @since 1.3 |
| 697 | */ |
| 698 | public AccessibleRelationSet getAccessibleRelationSet() { |
| 699 | return relationSet; |
| 700 | } |
| 701 | |
| 702 | /** |
| 703 | * Gets the AccessibleTable associated with an object |
| 704 | * |
| 705 | * @return an AccessibleTable if supported by object; |
| 706 | * otherwise return null |
| 707 | * @see AccessibleTable |
| 708 | * @since 1.3 |
| 709 | */ |
| 710 | public AccessibleTable getAccessibleTable() { |
| 711 | return null; |
| 712 | } |
| 713 | |
| 714 | /** |
| 715 | * Support for reporting bound property changes. If oldValue and |
| 716 | * newValue are not equal and the PropertyChangeEvent listener list |
| 717 | * is not empty, then fire a PropertyChange event to each listener. |
| 718 | * In general, this is for use by the Accessible objects themselves |
| 719 | * and should not be called by an application program. |
| 720 | * @param propertyName The programmatic name of the property that |
| 721 | * was changed. |
| 722 | * @param oldValue The old value of the property. |
| 723 | * @param newValue The new value of the property. |
| 724 | * @see java.beans.PropertyChangeSupport |
| 725 | * @see #addPropertyChangeListener |
| 726 | * @see #removePropertyChangeListener |
| 727 | * @see #ACCESSIBLE_NAME_PROPERTY |
| 728 | * @see #ACCESSIBLE_DESCRIPTION_PROPERTY |
| 729 | * @see #ACCESSIBLE_STATE_PROPERTY |
| 730 | * @see #ACCESSIBLE_VALUE_PROPERTY |
| 731 | * @see #ACCESSIBLE_SELECTION_PROPERTY |
| 732 | * @see #ACCESSIBLE_TEXT_PROPERTY |
| 733 | * @see #ACCESSIBLE_VISIBLE_DATA_PROPERTY |
| 734 | */ |
| 735 | public void firePropertyChange(String propertyName, |
| 736 | Object oldValue, |
| 737 | Object newValue) { |
| 738 | if (accessibleChangeSupport != null) { |
| 739 | if (newValue instanceof PropertyChangeEvent) { |
| 740 | PropertyChangeEvent pce = (PropertyChangeEvent)newValue; |
| 741 | accessibleChangeSupport.firePropertyChange(pce); |
| 742 | } else { |
| 743 | accessibleChangeSupport.firePropertyChange(propertyName, |
| 744 | oldValue, |
| 745 | newValue); |
| 746 | } |
| 747 | } |
| 748 | } |
| 749 | } |