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| 1 | /* | ||
| 2 | * Copyright (c) 1995, 2006, 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 java.awt; | ||
| 26 | |||
| 27 | import java.awt.peer.TextComponentPeer; | ||
| 28 | import java.awt.event.*; | ||
| 29 | import java.util.EventListener; | ||
| 30 | import java.io.ObjectOutputStream; | ||
| 31 | import java.io.ObjectInputStream; | ||
| 32 | import java.io.IOException; | ||
| 33 | import sun.awt.InputMethodSupport; | ||
| 34 | import java.text.BreakIterator; | ||
| 35 | import javax.swing.text.AttributeSet; | ||
| 36 | import javax.accessibility.*; | ||
| 37 | import java.awt.im.InputMethodRequests; | ||
| 38 | |||
| 39 | |||
| 40 | /** | ||
| 41 | * The <code>TextComponent</code> class is the superclass of | ||
| 42 | * any component that allows the editing of some text. | ||
| 43 | * <p> | ||
| 44 | * A text component embodies a string of text. The | ||
| 45 | * <code>TextComponent</code> class defines a set of methods | ||
| 46 | * that determine whether or not this text is editable. If the | ||
| 47 | * component is editable, it defines another set of methods | ||
| 48 | * that supports a text insertion caret. | ||
| 49 | * <p> | ||
| 50 | * In addition, the class defines methods that are used | ||
| 51 | * to maintain a current <em>selection</em> from the text. | ||
| 52 | * The text selection, a substring of the component's text, | ||
| 53 | * is the target of editing operations. It is also referred | ||
| 54 | * to as the <em>selected text</em>. | ||
| 55 | * | ||
| 56 | * @author Sami Shaio | ||
| 57 | * @author Arthur van Hoff | ||
| 58 | * @since JDK1.0 | ||
| 59 | */ | ||
| 60 | public class TextComponent extends Component implements Accessible { | ||
| 61 | |||
| 62 | /** | ||
| 63 | * The value of the text. | ||
| 64 | * A <code>null</code> value is the same as "". | ||
| 65 | * | ||
| 66 | * @serial | ||
| 67 | * @see #setText(String) | ||
| 68 | * @see #getText() | ||
| 69 | */ | ||
| 70 | String text; | ||
| 71 | |||
| 72 | /** | ||
| 73 | * A boolean indicating whether or not this | ||
| 74 | * <code>TextComponent</code> is editable. | ||
| 75 | * It will be <code>true</code> if the text component | ||
| 76 | * is editable and <code>false</code> if not. | ||
| 77 | * | ||
| 78 | * @serial | ||
| 79 | * @see #isEditable() | ||
| 80 | */ | ||
| 81 | boolean editable = true; | ||
| 82 | |||
| 83 | /** | ||
| 84 | * The selection refers to the selected text, and the | ||
| 85 | * <code>selectionStart</code> is the start position | ||
| 86 | * of the selected text. | ||
| 87 | * | ||
| 88 | * @serial | ||
| 89 | * @see #getSelectionStart() | ||
| 90 | * @see #setSelectionStart(int) | ||
| 91 | */ | ||
| 92 | int selectionStart; | ||
| 93 | |||
| 94 | /** | ||
| 95 | * The selection refers to the selected text, and the | ||
| 96 | * <code>selectionEnd</code> | ||
| 97 | * is the end position of the selected text. | ||
| 98 | * | ||
| 99 | * @serial | ||
| 100 | * @see #getSelectionEnd() | ||
| 101 | * @see #setSelectionEnd(int) | ||
| 102 | */ | ||
| 103 | int selectionEnd; | ||
| 104 | |||
| 105 | // A flag used to tell whether the background has been set by | ||
| 106 | // developer code (as opposed to AWT code). Used to determine | ||
| 107 | // the background color of non-editable TextComponents. | ||
| 108 | boolean backgroundSetByClientCode = false; | ||
| 109 | |||
| 110 | /** | ||
| 111 | * True if this <code>TextComponent</code> has access | ||
| 112 | * to the System clipboard. | ||
| 113 | */ | ||
| 114 | transient private boolean canAccessClipboard; | ||
| 115 | |||
| 116 | transient protected TextListener textListener; | ||
| 117 | |||
| 118 | /* | ||
| 119 | * JDK 1.1 serialVersionUID | ||
| 120 | */ | ||
| 121 | private static final long serialVersionUID = -2214773872412987419L; | ||
| 122 | |||
| 123 | /** | ||
| 124 | * Constructs a new text component initialized with the | ||
| 125 | * specified text. Sets the value of the cursor to | ||
| 126 | * <code>Cursor.TEXT_CURSOR</code>. | ||
| 127 | * @param text the text to be displayed; if | ||
| 128 | * <code>text</code> is <code>null</code>, the empty | ||
| 129 | * string <code>""</code> will be displayed | ||
| 130 | * @exception HeadlessException if | ||
| 131 | * <code>GraphicsEnvironment.isHeadless</code> | ||
| 132 | * returns true | ||
| 133 | * @see java.awt.GraphicsEnvironment#isHeadless | ||
| 134 | * @see java.awt.Cursor | ||
| 135 | */ | ||
| 136 | TextComponent(String text) throws HeadlessException { | ||
| 137 | GraphicsEnvironment.checkHeadless(); | ||
| 138 | this.text = (text != null) ? text : ""; | ||
| 139 | setCursor(Cursor.getPredefinedCursor(Cursor.TEXT_CURSOR)); | ||
| 140 | checkSystemClipboardAccess(); | ||
| 141 | } | ||
| 142 | |||
| 143 | private void enableInputMethodsIfNecessary() { | ||
| 144 | if (checkForEnableIM) { | ||
| 145 | checkForEnableIM = false; | ||
| 146 | try { | ||
| 147 | Toolkit toolkit = Toolkit.getDefaultToolkit(); | ||
| 148 | boolean shouldEnable = false; | ||
| 149 | if (toolkit instanceof InputMethodSupport) { | ||
| 150 | shouldEnable = ((InputMethodSupport)toolkit) | ||
| 151 | .enableInputMethodsForTextComponent(); | ||
| 152 | } | ||
| 153 | enableInputMethods(shouldEnable); | ||
| 154 | } catch (Exception e) { | ||
| 155 | // if something bad happens, just don't enable input methods | ||
| 156 | } | ||
| 157 | } | ||
| 158 | } | ||
| 159 | |||
| 160 | /** | ||
| 161 | * Enables or disables input method support for this text component. If input | ||
| 162 | * method support is enabled and the text component also processes key events, | ||
| 163 | * incoming events are offered to the current input method and will only be | ||
| 164 | * processed by the component or dispatched to its listeners if the input method | ||
| 165 | * does not consume them. Whether and how input method support for this text | ||
| 166 | * component is enabled or disabled by default is implementation dependent. | ||
| 167 | * | ||
| 168 | * @param enable true to enable, false to disable | ||
| 169 | * @see #processKeyEvent | ||
| 170 | * @since 1.2 | ||
| 171 | */ | ||
| 172 | public void enableInputMethods(boolean enable) { | ||
| 173 | checkForEnableIM = false; | ||
| 174 | super.enableInputMethods(enable); | ||
| 175 | } | ||
| 176 | |||
| 177 | boolean areInputMethodsEnabled() { | ||
| 178 | // moved from the constructor above to here and addNotify below, | ||
| 179 | // this call will initialize the toolkit if not already initialized. | ||
| 180 | if (checkForEnableIM) { | ||
| 181 | enableInputMethodsIfNecessary(); | ||
| 182 | } | ||
| 183 | |||
| 184 | // TextComponent handles key events without touching the eventMask or | ||
| 185 | // having a key listener, so just check whether the flag is set | ||
| 186 | return (eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0; | ||
| 187 | } | ||
| 188 | |||
| 189 | public InputMethodRequests getInputMethodRequests() { | ||
| 190 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 191 | if (peer != null) return peer.getInputMethodRequests(); | ||
| 192 | else return null; | ||
| 193 | } | ||
| 194 | |||
| 195 | |||
| 196 | |||
| 197 | /** | ||
| 198 | * Makes this Component displayable by connecting it to a | ||
| 199 | * native screen resource. | ||
| 200 | * This method is called internally by the toolkit and should | ||
| 201 | * not be called directly by programs. | ||
| 202 | * @see java.awt.TextComponent#removeNotify | ||
| 203 | */ | ||
| 204 | public void addNotify() { | ||
| 205 | super.addNotify(); | ||
| 206 | enableInputMethodsIfNecessary(); | ||
| 207 | } | ||
| 208 | |||
| 209 | /** | ||
| 210 | * Removes the <code>TextComponent</code>'s peer. | ||
| 211 | * The peer allows us to modify the appearance of the | ||
| 212 | * <code>TextComponent</code> without changing its | ||
| 213 | * functionality. | ||
| 214 | */ | ||
| 215 | public void removeNotify() { | ||
| 216 | synchronized (getTreeLock()) { | ||
| 217 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 218 | if (peer != null) { | ||
| 219 | text = peer.getText(); | ||
| 220 | selectionStart = peer.getSelectionStart(); | ||
| 221 | selectionEnd = peer.getSelectionEnd(); | ||
| 222 | } | ||
| 223 | super.removeNotify(); | ||
| 224 | } | ||
| 225 | } | ||
| 226 | |||
| 227 | /** | ||
| 228 | * Sets the text that is presented by this | ||
| 229 | * text component to be the specified text. | ||
| 230 | * @param t the new text; | ||
| 231 | * if this parameter is <code>null</code> then | ||
| 232 | * the text is set to the empty string "" | ||
| 233 | * @see java.awt.TextComponent#getText | ||
| 234 | */ | ||
| 235 | public synchronized void setText(String t) { | ||
| 236 | text = (t != null) ? t : ""; | ||
| 237 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 238 | if (peer != null) { | ||
| 239 | peer.setText(text); | ||
| 240 | } | ||
| 241 | } | ||
| 242 | |||
| 243 | /** | ||
| 244 | * Returns the text that is presented by this text component. | ||
| 245 | * By default, this is an empty string. | ||
| 246 | * | ||
| 247 | * @return the value of this <code>TextComponent</code> | ||
| 248 | * @see java.awt.TextComponent#setText | ||
| 249 | */ | ||
| 250 | public synchronized String getText() { | ||
| 251 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 252 | if (peer != null) { | ||
| 253 | text = peer.getText(); | ||
| 254 | } | ||
| 255 | return text; | ||
| 256 | } | ||
| 257 | |||
| 258 | /** | ||
| 259 | * Returns the selected text from the text that is | ||
| 260 | * presented by this text component. | ||
| 261 | * @return the selected text of this text component | ||
| 262 | * @see java.awt.TextComponent#select | ||
| 263 | */ | ||
| 264 | public synchronized String getSelectedText() { | ||
| 265 | return getText().substring(getSelectionStart(), getSelectionEnd()); | ||
| 266 | } | ||
| 267 | |||
| 268 | /** | ||
| 269 | * Indicates whether or not this text component is editable. | ||
| 270 | * @return <code>true</code> if this text component is | ||
| 271 | * editable; <code>false</code> otherwise. | ||
| 272 | * @see java.awt.TextComponent#setEditable | ||
| 273 | * @since JDK1.0 | ||
| 274 | */ | ||
| 275 | public boolean isEditable() { | ||
| 276 | return editable; | ||
| 277 | } | ||
| 278 | |||
| 279 | /** | ||
| 280 | * Sets the flag that determines whether or not this | ||
| 281 | * text component is editable. | ||
| 282 | * <p> | ||
| 283 | * If the flag is set to <code>true</code>, this text component | ||
| 284 | * becomes user editable. If the flag is set to <code>false</code>, | ||
| 285 | * the user cannot change the text of this text component. | ||
| 286 | * By default, non-editable text components have a background color | ||
| 287 | * of SystemColor.control. This default can be overridden by | ||
| 288 | * calling setBackground. | ||
| 289 | * | ||
| 290 | * @param b a flag indicating whether this text component | ||
| 291 | * is user editable. | ||
| 292 | * @see java.awt.TextComponent#isEditable | ||
| 293 | * @since JDK1.0 | ||
| 294 | */ | ||
| 295 | public synchronized void setEditable(boolean b) { | ||
| 296 | if (editable == b) { | ||
| 297 | return; | ||
| 298 | } | ||
| 299 | |||
| 300 | editable = b; | ||
| 301 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 302 | if (peer != null) { | ||
| 303 | peer.setEditable(b); | ||
| 304 | } | ||
| 305 | } | ||
| 306 | |||
| 307 | /** | ||
| 308 | * Gets the background color of this text component. | ||
| 309 | * | ||
| 310 | * By default, non-editable text components have a background color | ||
| 311 | * of SystemColor.control. This default can be overridden by | ||
| 312 | * calling setBackground. | ||
| 313 | * | ||
| 314 | * @return This text component's background color. | ||
| 315 | * If this text component does not have a background color, | ||
| 316 | * the background color of its parent is returned. | ||
| 317 | * @see #setBackground(Color) | ||
| 318 | * @since JDK1.0 | ||
| 319 | */ | ||
| 320 | public Color getBackground() { | ||
| 321 | if (!editable && !backgroundSetByClientCode) { | ||
| 322 | return SystemColor.control; | ||
| 323 | } | ||
| 324 | |||
| 325 | return super.getBackground(); | ||
| 326 | } | ||
| 327 | |||
| 328 | /** | ||
| 329 | * Sets the background color of this text component. | ||
| 330 | * | ||
| 331 | * @param c The color to become this text component's color. | ||
| 332 | * If this parameter is null then this text component | ||
| 333 | * will inherit the background color of its parent. | ||
| 334 | * @see #getBackground() | ||
| 335 | * @since JDK1.0 | ||
| 336 | */ | ||
| 337 | public void setBackground(Color c) { | ||
| 338 | backgroundSetByClientCode = true; | ||
| 339 | super.setBackground(c); | ||
| 340 | } | ||
| 341 | |||
| 342 | /** | ||
| 343 | * Gets the start position of the selected text in | ||
| 344 | * this text component. | ||
| 345 | * @return the start position of the selected text | ||
| 346 | * @see java.awt.TextComponent#setSelectionStart | ||
| 347 | * @see java.awt.TextComponent#getSelectionEnd | ||
| 348 | */ | ||
| 349 | public synchronized int getSelectionStart() { | ||
| 350 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 351 | if (peer != null) { | ||
| 352 | selectionStart = peer.getSelectionStart(); | ||
| 353 | } | ||
| 354 | return selectionStart; | ||
| 355 | } | ||
| 356 | |||
| 357 | /** | ||
| 358 | * Sets the selection start for this text component to | ||
| 359 | * the specified position. The new start point is constrained | ||
| 360 | * to be at or before the current selection end. It also | ||
| 361 | * cannot be set to less than zero, the beginning of the | ||
| 362 | * component's text. | ||
| 363 | * If the caller supplies a value for <code>selectionStart</code> | ||
| 364 | * that is out of bounds, the method enforces these constraints | ||
| 365 | * silently, and without failure. | ||
| 366 | * @param selectionStart the start position of the | ||
| 367 | * selected text | ||
| 368 | * @see java.awt.TextComponent#getSelectionStart | ||
| 369 | * @see java.awt.TextComponent#setSelectionEnd | ||
| 370 | * @since JDK1.1 | ||
| 371 | */ | ||
| 372 | public synchronized void setSelectionStart(int selectionStart) { | ||
| 373 | /* Route through select method to enforce consistent policy | ||
| 374 | * between selectionStart and selectionEnd. | ||
| 375 | */ | ||
| 376 | select(selectionStart, getSelectionEnd()); | ||
| 377 | } | ||
| 378 | |||
| 379 | /** | ||
| 380 | * Gets the end position of the selected text in | ||
| 381 | * this text component. | ||
| 382 | * @return the end position of the selected text | ||
| 383 | * @see java.awt.TextComponent#setSelectionEnd | ||
| 384 | * @see java.awt.TextComponent#getSelectionStart | ||
| 385 | */ | ||
| 386 | public synchronized int getSelectionEnd() { | ||
| 387 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 388 | if (peer != null) { | ||
| 389 | selectionEnd = peer.getSelectionEnd(); | ||
| 390 | } | ||
| 391 | return selectionEnd; | ||
| 392 | } | ||
| 393 | |||
| 394 | /** | ||
| 395 | * Sets the selection end for this text component to | ||
| 396 | * the specified position. The new end point is constrained | ||
| 397 | * to be at or after the current selection start. It also | ||
| 398 | * cannot be set beyond the end of the component's text. | ||
| 399 | * If the caller supplies a value for <code>selectionEnd</code> | ||
| 400 | * that is out of bounds, the method enforces these constraints | ||
| 401 | * silently, and without failure. | ||
| 402 | * @param selectionEnd the end position of the | ||
| 403 | * selected text | ||
| 404 | * @see java.awt.TextComponent#getSelectionEnd | ||
| 405 | * @see java.awt.TextComponent#setSelectionStart | ||
| 406 | * @since JDK1.1 | ||
| 407 | */ | ||
| 408 | public synchronized void setSelectionEnd(int selectionEnd) { | ||
| 409 | /* Route through select method to enforce consistent policy | ||
| 410 | * between selectionStart and selectionEnd. | ||
| 411 | */ | ||
| 412 | select(getSelectionStart(), selectionEnd); | ||
| 413 | } | ||
| 414 | |||
| 415 | /** | ||
| 416 | * Selects the text between the specified start and end positions. | ||
| 417 | * <p> | ||
| 418 | * This method sets the start and end positions of the | ||
| 419 | * selected text, enforcing the restriction that the start position | ||
| 420 | * must be greater than or equal to zero. The end position must be | ||
| 421 | * greater than or equal to the start position, and less than or | ||
| 422 | * equal to the length of the text component's text. The | ||
| 423 | * character positions are indexed starting with zero. | ||
| 424 | * The length of the selection is | ||
| 425 | * <code>endPosition</code> - <code>startPosition</code>, so the | ||
| 426 | * character at <code>endPosition</code> is not selected. | ||
| 427 | * If the start and end positions of the selected text are equal, | ||
| 428 | * all text is deselected. | ||
| 429 | * <p> | ||
| 430 | * If the caller supplies values that are inconsistent or out of | ||
| 431 | * bounds, the method enforces these constraints silently, and | ||
| 432 | * without failure. Specifically, if the start position or end | ||
| 433 | * position is greater than the length of the text, it is reset to | ||
| 434 | * equal the text length. If the start position is less than zero, | ||
| 435 | * it is reset to zero, and if the end position is less than the | ||
| 436 | * start position, it is reset to the start position. | ||
| 437 | * | ||
| 438 | * @param selectionStart the zero-based index of the first | ||
| 439 | character (<code>char</code> value) to be selected | ||
| 440 | * @param selectionEnd the zero-based end position of the | ||
| 441 | text to be selected; the character (<code>char</code> value) at | ||
| 442 | <code>selectionEnd</code> is not selected | ||
| 443 | * @see java.awt.TextComponent#setSelectionStart | ||
| 444 | * @see java.awt.TextComponent#setSelectionEnd | ||
| 445 | * @see java.awt.TextComponent#selectAll | ||
| 446 | */ | ||
| 447 | public synchronized void select(int selectionStart, int selectionEnd) { | ||
| 448 | String text = getText(); | ||
| 449 | if (selectionStart < 0) { | ||
| 450 | selectionStart = 0; | ||
| 451 | } | ||
| 452 | if (selectionStart > text.length()) { | ||
| 453 | selectionStart = text.length(); | ||
| 454 | } | ||
| 455 | if (selectionEnd > text.length()) { | ||
| 456 | selectionEnd = text.length(); | ||
| 457 | } | ||
| 458 | if (selectionEnd < selectionStart) { | ||
| 459 | selectionEnd = selectionStart; | ||
| 460 | } | ||
| 461 | |||
| 462 | this.selectionStart = selectionStart; | ||
| 463 | this.selectionEnd = selectionEnd; | ||
| 464 | |||
| 465 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 466 | if (peer != null) { | ||
| 467 | peer.select(selectionStart, selectionEnd); | ||
| 468 | } | ||
| 469 | } | ||
| 470 | |||
| 471 | /** | ||
| 472 | * Selects all the text in this text component. | ||
| 473 | * @see java.awt.TextComponent#select | ||
| 474 | */ | ||
| 475 | public synchronized void selectAll() { | ||
| 476 | this.selectionStart = 0; | ||
| 477 | this.selectionEnd = getText().length(); | ||
| 478 | |||
| 479 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 480 | if (peer != null) { | ||
| 481 | peer.select(selectionStart, selectionEnd); | ||
| 482 | } | ||
| 483 | } | ||
| 484 | |||
| 485 | /** | ||
| 486 | * Sets the position of the text insertion caret. | ||
| 487 | * The caret position is constrained to be between 0 | ||
| 488 | * and the last character of the text, inclusive. | ||
| 489 | * If the passed-in value is greater than this range, | ||
| 490 | * the value is set to the last character (or 0 if | ||
| 491 | * the <code>TextComponent</code> contains no text) | ||
| 492 | * and no error is returned. If the passed-in value is | ||
| 493 | * less than 0, an <code>IllegalArgumentException</code> | ||
| 494 | * is thrown. | ||
| 495 | * | ||
| 496 | * @param position the position of the text insertion caret | ||
| 497 | * @exception IllegalArgumentException if <code>position</code> | ||
| 498 | * is less than zero | ||
| 499 | * @since JDK1.1 | ||
| 500 | */ | ||
| 501 | public synchronized void setCaretPosition(int position) { | ||
| 502 | if (position < 0) { | ||
| 503 | throw new IllegalArgumentException("position less than zero."); | ||
| 504 | } | ||
| 505 | |||
| 506 | int maxposition = getText().length(); | ||
| 507 | if (position > maxposition) { | ||
| 508 | position = maxposition; | ||
| 509 | } | ||
| 510 | |||
| 511 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 512 | if (peer != null) { | ||
| 513 | peer.setCaretPosition(position); | ||
| 514 | } else { | ||
| 515 | select(position, position); | ||
| 516 | } | ||
| 517 | } | ||
| 518 | |||
| 519 | /** | ||
| 520 | * Returns the position of the text insertion caret. | ||
| 521 | * The caret position is constrained to be between 0 | ||
| 522 | * and the last character of the text, inclusive. | ||
| 523 | * If the text or caret have not been set, the default | ||
| 524 | * caret position is 0. | ||
| 525 | * | ||
| 526 | * @return the position of the text insertion caret | ||
| 527 | * @see #setCaretPosition(int) | ||
| 528 | * @since JDK1.1 | ||
| 529 | */ | ||
| 530 | public synchronized int getCaretPosition() { | ||
| 531 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 532 | int position = 0; | ||
| 533 | |||
| 534 | if (peer != null) { | ||
| 535 | position = peer.getCaretPosition(); | ||
| 536 | } else { | ||
| 537 | position = selectionStart; | ||
| 538 | } | ||
| 539 | int maxposition = getText().length(); | ||
| 540 | if (position > maxposition) { | ||
| 541 | position = maxposition; | ||
| 542 | } | ||
| 543 | return position; | ||
| 544 | } | ||
| 545 | |||
| 546 | /** | ||
| 547 | * Adds the specified text event listener to receive text events | ||
| 548 | * from this text component. | ||
| 549 | * If <code>l</code> is <code>null</code>, no exception is | ||
| 550 | * thrown and no action is performed. | ||
| 551 | * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" | ||
| 552 | * >AWT Threading Issues</a> for details on AWT's threading model. | ||
| 553 | * | ||
| 554 | * @param l the text event listener | ||
| 555 | * @see #removeTextListener | ||
| 556 | * @see #getTextListeners | ||
| 557 | * @see java.awt.event.TextListener | ||
| 558 | */ | ||
| 559 | public synchronized void addTextListener(TextListener l) { | ||
| 560 | if (l == null) { | ||
| 561 | return; | ||
| 562 | } | ||
| 563 | textListener = AWTEventMulticaster.add(textListener, l); | ||
| 564 | newEventsOnly = true; | ||
| 565 | } | ||
| 566 | |||
| 567 | /** | ||
| 568 | * Removes the specified text event listener so that it no longer | ||
| 569 | * receives text events from this text component | ||
| 570 | * If <code>l</code> is <code>null</code>, no exception is | ||
| 571 | * thrown and no action is performed. | ||
| 572 | * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" | ||
| 573 | * >AWT Threading Issues</a> for details on AWT's threading model. | ||
| 574 | * | ||
| 575 | * @param l the text listener | ||
| 576 | * @see #addTextListener | ||
| 577 | * @see #getTextListeners | ||
| 578 | * @see java.awt.event.TextListener | ||
| 579 | * @since JDK1.1 | ||
| 580 | */ | ||
| 581 | public synchronized void removeTextListener(TextListener l) { | ||
| 582 | if (l == null) { | ||
| 583 | return; | ||
| 584 | } | ||
| 585 | textListener = AWTEventMulticaster.remove(textListener, l); | ||
| 586 | } | ||
| 587 | |||
| 588 | /** | ||
| 589 | * Returns an array of all the text listeners | ||
| 590 | * registered on this text component. | ||
| 591 | * | ||
| 592 | * @return all of this text component's <code>TextListener</code>s | ||
| 593 | * or an empty array if no text | ||
| 594 | * listeners are currently registered | ||
| 595 | * | ||
| 596 | * | ||
| 597 | * @see #addTextListener | ||
| 598 | * @see #removeTextListener | ||
| 599 | * @since 1.4 | ||
| 600 | */ | ||
| 601 | public synchronized TextListener[] getTextListeners() { | ||
| 602 | return (TextListener[])(getListeners(TextListener.class)); | ||
| 603 | } | ||
| 604 | |||
| 605 | /** | ||
| 606 | * Returns an array of all the objects currently registered | ||
| 607 | * as <code><em>Foo</em>Listener</code>s | ||
| 608 | * upon this <code>TextComponent</code>. | ||
| 609 | * <code><em>Foo</em>Listener</code>s are registered using the | ||
| 610 | * <code>add<em>Foo</em>Listener</code> method. | ||
| 611 | * | ||
| 612 | * <p> | ||
| 613 | * You can specify the <code>listenerType</code> argument | ||
| 614 | * with a class literal, such as | ||
| 615 | * <code><em>Foo</em>Listener.class</code>. | ||
| 616 | * For example, you can query a | ||
| 617 | * <code>TextComponent</code> <code>t</code> | ||
| 618 | * for its text listeners with the following code: | ||
| 619 | * | ||
| 620 | * <pre>TextListener[] tls = (TextListener[])(t.getListeners(TextListener.class));</pre> | ||
| 621 | * | ||
| 622 | * If no such listeners exist, this method returns an empty array. | ||
| 623 | * | ||
| 624 | * @param listenerType the type of listeners requested; this parameter | ||
| 625 | * should specify an interface that descends from | ||
| 626 | * <code>java.util.EventListener</code> | ||
| 627 | * @return an array of all objects registered as | ||
| 628 | * <code><em>Foo</em>Listener</code>s on this text component, | ||
| 629 | * or an empty array if no such | ||
| 630 | * listeners have been added | ||
| 631 | * @exception ClassCastException if <code>listenerType</code> | ||
| 632 | * doesn't specify a class or interface that implements | ||
| 633 | * <code>java.util.EventListener</code> | ||
| 634 | * | ||
| 635 | * @see #getTextListeners | ||
| 636 | * @since 1.3 | ||
| 637 | */ | ||
| 638 | public <T extends EventListener> T[] getListeners(Class<T> listenerType) { | ||
| 639 | EventListener l = null; | ||
| 640 | if (listenerType == TextListener.class) { | ||
| 641 | l = textListener; | ||
| 642 | } else { | ||
| 643 | return super.getListeners(listenerType); | ||
| 644 | } | ||
| 645 | return AWTEventMulticaster.getListeners(l, listenerType); | ||
| 646 | } | ||
| 647 | |||
| 648 | // REMIND: remove when filtering is done at lower level | ||
| 649 | boolean eventEnabled(AWTEvent e) { | ||
| 650 | if (e.id == TextEvent.TEXT_VALUE_CHANGED) { | ||
| 651 | if ((eventMask & AWTEvent.TEXT_EVENT_MASK) != 0 || | ||
| 652 | textListener != null) { | ||
| 653 | return true; | ||
| 654 | } | ||
| 655 | return false; | ||
| 656 | } | ||
| 657 | return super.eventEnabled(e); | ||
| 658 | } | ||
| 659 | |||
| 660 | /** | ||
| 661 | * Processes events on this text component. If the event is a | ||
| 662 | * <code>TextEvent</code>, it invokes the <code>processTextEvent</code> | ||
| 663 | * method else it invokes its superclass's <code>processEvent</code>. | ||
| 664 | * <p>Note that if the event parameter is <code>null</code> | ||
| 665 | * the behavior is unspecified and may result in an | ||
| 666 | * exception. | ||
| 667 | * | ||
| 668 | * @param e the event | ||
| 669 | */ | ||
| 670 | protected void processEvent(AWTEvent e) { | ||
| 671 | if (e instanceof TextEvent) { | ||
| 672 | processTextEvent((TextEvent)e); | ||
| 673 | return; | ||
| 674 | } | ||
| 675 | super.processEvent(e); | ||
| 676 | } | ||
| 677 | |||
| 678 | /** | ||
| 679 | * Processes text events occurring on this text component by | ||
| 680 | * dispatching them to any registered <code>TextListener</code> objects. | ||
| 681 | * <p> | ||
| 682 | * NOTE: This method will not be called unless text events | ||
| 683 | * are enabled for this component. This happens when one of the | ||
| 684 | * following occurs: | ||
| 685 | * <ul> | ||
| 686 | * <li>A <code>TextListener</code> object is registered | ||
| 687 | * via <code>addTextListener</code> | ||
| 688 | * <li>Text events are enabled via <code>enableEvents</code> | ||
| 689 | * </ul> | ||
| 690 | * <p>Note that if the event parameter is <code>null</code> | ||
| 691 | * the behavior is unspecified and may result in an | ||
| 692 | * exception. | ||
| 693 | * | ||
| 694 | * @param e the text event | ||
| 695 | * @see Component#enableEvents | ||
| 696 | */ | ||
| 697 | protected void processTextEvent(TextEvent e) { | ||
| 698 | TextListener listener = textListener; | ||
| 699 | if (listener != null) { | ||
| 700 | int id = e.getID(); | ||
| 701 | switch (id) { | ||
| 702 | case TextEvent.TEXT_VALUE_CHANGED: | ||
| 703 | listener.textValueChanged(e); | ||
| 704 | break; | ||
| 705 | } | ||
| 706 | } | ||
| 707 | } | ||
| 708 | |||
| 709 | /** | ||
| 710 | * Returns a string representing the state of this | ||
| 711 | * <code>TextComponent</code>. This | ||
| 712 | * method is intended to be used only for debugging purposes, and the | ||
| 713 | * content and format of the returned string may vary between | ||
| 714 | * implementations. The returned string may be empty but may not be | ||
| 715 | * <code>null</code>. | ||
| 716 | * | ||
| 717 | * @return the parameter string of this text component | ||
| 718 | */ | ||
| 719 | protected String paramString() { | ||
| 720 | String str = super.paramString() + ",text=" + getText(); | ||
| 721 | if (editable) { | ||
| 722 | str += ",editable"; | ||
| 723 | } | ||
| 724 | return str + ",selection=" + getSelectionStart() + "-" + getSelectionEnd(); | ||
| 725 | } | ||
| 726 | |||
| 727 | /** | ||
| 728 | * Assigns a valid value to the canAccessClipboard instance variable. | ||
| 729 | */ | ||
| 730 | private void checkSystemClipboardAccess() { | ||
| 731 | canAccessClipboard = true; | ||
| 732 | SecurityManager sm = System.getSecurityManager(); | ||
| 733 | if (sm != null) { | ||
| 734 | try { | ||
| 735 | sm.checkSystemClipboardAccess(); | ||
| 736 | } | ||
| 737 | catch (SecurityException e) { | ||
| 738 | canAccessClipboard = false; | ||
| 739 | } | ||
| 740 | } | ||
| 741 | } | ||
| 742 | |||
| 743 | /* | ||
| 744 | * Serialization support. | ||
| 745 | */ | ||
| 746 | /** | ||
| 747 | * The textComponent SerializedDataVersion. | ||
| 748 | * | ||
| 749 | * @serial | ||
| 750 | */ | ||
| 751 | private int textComponentSerializedDataVersion = 1; | ||
| 752 | |||
| 753 | /** | ||
| 754 | * Writes default serializable fields to stream. Writes | ||
| 755 | * a list of serializable TextListener(s) as optional data. | ||
| 756 | * The non-serializable TextListener(s) are detected and | ||
| 757 | * no attempt is made to serialize them. | ||
| 758 | * | ||
| 759 | * @serialData Null terminated sequence of zero or more pairs. | ||
| 760 | * A pair consists of a String and Object. | ||
| 761 | * The String indicates the type of object and | ||
| 762 | * is one of the following : | ||
| 763 | * textListenerK indicating and TextListener object. | ||
| 764 | * | ||
| 765 | * @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener) | ||
| 766 | * @see java.awt.Component#textListenerK | ||
| 767 | */ | ||
| 768 | private void writeObject(java.io.ObjectOutputStream s) | ||
| 769 | throws IOException | ||
| 770 | { | ||
| 771 | // Serialization support. Since the value of the fields | ||
| 772 | // selectionStart, selectionEnd, and text aren't necessarily | ||
| 773 | // up to date, we sync them up with the peer before serializing. | ||
| 774 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 775 | if (peer != null) { | ||
| 776 | text = peer.getText(); | ||
| 777 | selectionStart = peer.getSelectionStart(); | ||
| 778 | selectionEnd = peer.getSelectionEnd(); | ||
| 779 | } | ||
| 780 | |||
| 781 | s.defaultWriteObject(); | ||
| 782 | |||
| 783 | AWTEventMulticaster.save(s, textListenerK, textListener); | ||
| 784 | s.writeObject(null); | ||
| 785 | } | ||
| 786 | |||
| 787 | /** | ||
| 788 | * Read the ObjectInputStream, and if it isn't null, | ||
| 789 | * add a listener to receive text events fired by the | ||
| 790 | * TextComponent. Unrecognized keys or values will be | ||
| 791 | * ignored. | ||
| 792 | * | ||
| 793 | * @exception HeadlessException if | ||
| 794 | * <code>GraphicsEnvironment.isHeadless()</code> returns | ||
| 795 | * <code>true</code> | ||
| 796 | * @see #removeTextListener | ||
| 797 | * @see #addTextListener | ||
| 798 | * @see java.awt.GraphicsEnvironment#isHeadless | ||
| 799 | */ | ||
| 800 | private void readObject(ObjectInputStream s) | ||
| 801 | throws ClassNotFoundException, IOException, HeadlessException | ||
| 802 | { | ||
| 803 | GraphicsEnvironment.checkHeadless(); | ||
| 804 | s.defaultReadObject(); | ||
| 805 | |||
| 806 | // Make sure the state we just read in for text, | ||
| 807 | // selectionStart and selectionEnd has legal values | ||
| 808 | this.text = (text != null) ? text : ""; | ||
| 809 | select(selectionStart, selectionEnd); | ||
| 810 | |||
| 811 | Object keyOrNull; | ||
| 812 | while(null != (keyOrNull = s.readObject())) { | ||
| 813 | String key = ((String)keyOrNull).intern(); | ||
| 814 | |||
| 815 | if (textListenerK == key) { | ||
| 816 | addTextListener((TextListener)(s.readObject())); | ||
| 817 | } else { | ||
| 818 | // skip value for unrecognized key | ||
| 819 | s.readObject(); | ||
| 820 | } | ||
| 821 | } | ||
| 822 | enableInputMethodsIfNecessary(); | ||
| 823 | checkSystemClipboardAccess(); | ||
| 824 | } | ||
| 825 | |||
| 826 | |||
| 827 | ///////////////// | ||
| 828 | // Accessibility support | ||
| 829 | //////////////// | ||
| 830 | |||
| 831 | |||
| 832 | /** | ||
| 833 | * | ||
| 834 | */ | ||
| 835 | int getIndexAtPoint(Point p) { | ||
| 836 | return -1; | ||
| 837 | /* To be fully implemented in a future release | ||
| 838 | if (peer == null) { | ||
| 839 | return -1; | ||
| 840 | } | ||
| 841 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 842 | return peer.getIndexAtPoint(p.x, p.y); | ||
| 843 | */ | ||
| 844 | } | ||
| 845 | |||
| 846 | |||
| 847 | /** | ||
| 848 | * | ||
| 849 | */ | ||
| 850 | Rectangle getCharacterBounds(int i) { | ||
| 851 | return null; | ||
| 852 | /* To be fully implemented in a future release | ||
| 853 | if (peer == null) { | ||
| 854 | return null; | ||
| 855 | } | ||
| 856 | TextComponentPeer peer = (TextComponentPeer)this.peer; | ||
| 857 | return peer.getCharacterBounds(i); | ||
| 858 | */ | ||
| 859 | } | ||
| 860 | |||
| 861 | |||
| 862 | /** | ||
| 863 | * Gets the AccessibleContext associated with this TextComponent. | ||
| 864 | * For text components, the AccessibleContext takes the form of an | ||
| 865 | * AccessibleAWTTextComponent. | ||
| 866 | * A new AccessibleAWTTextComponent instance is created if necessary. | ||
| 867 | * | ||
| 868 | * @return an AccessibleAWTTextComponent that serves as the | ||
| 869 | * AccessibleContext of this TextComponent | ||
| 870 | * @since 1.3 | ||
| 871 | */ | ||
| 872 | public AccessibleContext getAccessibleContext() { | ||
| 873 | if (accessibleContext == null) { | ||
| 874 | accessibleContext = new AccessibleAWTTextComponent(); | ||
| 875 | } | ||
| 876 | return accessibleContext; | ||
| 877 | } | ||
| 878 | |||
| 879 | /** | ||
| 880 | * This class implements accessibility support for the | ||
| 881 | * <code>TextComponent</code> class. It provides an implementation of the | ||
| 882 | * Java Accessibility API appropriate to text component user-interface | ||
| 883 | * elements. | ||
| 884 | * @since 1.3 | ||
| 885 | */ | ||
| 886 | protected class AccessibleAWTTextComponent extends AccessibleAWTComponent | ||
| 887 | implements AccessibleText, TextListener | ||
| 888 | { | ||
| 889 | /* | ||
| 890 | * JDK 1.3 serialVersionUID | ||
| 891 | */ | ||
| 892 | private static final long serialVersionUID = 3631432373506317811L; | ||
| 893 | |||
| 894 | /** | ||
| 895 | * Constructs an AccessibleAWTTextComponent. Adds a listener to track | ||
| 896 | * caret change. | ||
| 897 | */ | ||
| 898 | public AccessibleAWTTextComponent() { | ||
| 899 | TextComponent.this.addTextListener(this); | ||
| 900 | } | ||
| 901 | |||
| 902 | /** | ||
| 903 | * TextListener notification of a text value change. | ||
| 904 | */ | ||
| 905 | public void textValueChanged(TextEvent textEvent) { | ||
| 906 | Integer cpos = Integer.valueOf(TextComponent.this.getCaretPosition()); | ||
| 907 | firePropertyChange(ACCESSIBLE_TEXT_PROPERTY, null, cpos); | ||
| 908 | } | ||
| 909 | |||
| 910 | /** | ||
| 911 | * Gets the state set of the TextComponent. | ||
| 912 | * The AccessibleStateSet of an object is composed of a set of | ||
| 913 | * unique AccessibleStates. A change in the AccessibleStateSet | ||
| 914 | * of an object will cause a PropertyChangeEvent to be fired | ||
| 915 | * for the AccessibleContext.ACCESSIBLE_STATE_PROPERTY property. | ||
| 916 | * | ||
| 917 | * @return an instance of AccessibleStateSet containing the | ||
| 918 | * current state set of the object | ||
| 919 | * @see AccessibleStateSet | ||
| 920 | * @see AccessibleState | ||
| 921 | * @see #addPropertyChangeListener | ||
| 922 | */ | ||
| 923 | public AccessibleStateSet getAccessibleStateSet() { | ||
| 924 | AccessibleStateSet states = super.getAccessibleStateSet(); | ||
| 925 | if (TextComponent.this.isEditable()) { | ||
| 926 | states.add(AccessibleState.EDITABLE); | ||
| 927 | } | ||
| 928 | return states; | ||
| 929 | } | ||
| 930 | |||
| 931 | |||
| 932 | /** | ||
| 933 | * Gets the role of this object. | ||
| 934 | * | ||
| 935 | * @return an instance of AccessibleRole describing the role of the | ||
| 936 | * object (AccessibleRole.TEXT) | ||
| 937 | * @see AccessibleRole | ||
| 938 | */ | ||
| 939 | public AccessibleRole getAccessibleRole() { | ||
| 940 | return AccessibleRole.TEXT; | ||
| 941 | } | ||
| 942 | |||
| 943 | /** | ||
| 944 | * Get the AccessibleText associated with this object. In the | ||
| 945 | * implementation of the Java Accessibility API for this class, | ||
| 946 | * return this object, which is responsible for implementing the | ||
| 947 | * AccessibleText interface on behalf of itself. | ||
| 948 | * | ||
| 949 | * @return this object | ||
| 950 | */ | ||
| 951 | public AccessibleText getAccessibleText() { | ||
| 952 | return this; | ||
| 953 | } | ||
| 954 | |||
| 955 | |||
| 956 | // --- interface AccessibleText methods ------------------------ | ||
| 957 | |||
| 958 | /** | ||
| 959 | * Many of these methods are just convenience methods; they | ||
| 960 | * just call the equivalent on the parent | ||
| 961 | */ | ||
| 962 | |||
| 963 | /** | ||
| 964 | * Given a point in local coordinates, return the zero-based index | ||
| 965 | * of the character under that Point. If the point is invalid, | ||
| 966 | * this method returns -1. | ||
| 967 | * | ||
| 968 | * @param p the Point in local coordinates | ||
| 969 | * @return the zero-based index of the character under Point p. | ||
| 970 | */ | ||
| 971 | public int getIndexAtPoint(Point p) { | ||
| 972 | return TextComponent.this.getIndexAtPoint(p); | ||
| 973 | } | ||
| 974 | |||
| 975 | /** | ||
| 976 | * Determines the bounding box of the character at the given | ||
| 977 | * index into the string. The bounds are returned in local | ||
| 978 | * coordinates. If the index is invalid a null rectangle | ||
| 979 | * is returned. | ||
| 980 | * | ||
| 981 | * @param i the index into the String >= 0 | ||
| 982 | * @return the screen coordinates of the character's bounding box | ||
| 983 | */ | ||
| 984 | public Rectangle getCharacterBounds(int i) { | ||
| 985 | return TextComponent.this.getCharacterBounds(i); | ||
| 986 | } | ||
| 987 | |||
| 988 | /** | ||
| 989 | * Returns the number of characters (valid indicies) | ||
| 990 | * | ||
| 991 | * @return the number of characters >= 0 | ||
| 992 | */ | ||
| 993 | public int getCharCount() { | ||
| 994 | return TextComponent.this.getText().length(); | ||
| 995 | } | ||
| 996 | |||
| 997 | /** | ||
| 998 | * Returns the zero-based offset of the caret. | ||
| 999 | * | ||
| 1000 | * Note: The character to the right of the caret will have the | ||
| 1001 | * same index value as the offset (the caret is between | ||
| 1002 | * two characters). | ||
| 1003 | * | ||
| 1004 | * @return the zero-based offset of the caret. | ||
| 1005 | */ | ||
| 1006 | public int getCaretPosition() { | ||
| 1007 | return TextComponent.this.getCaretPosition(); | ||
| 1008 | } | ||
| 1009 | |||
| 1010 | /** | ||
| 1011 | * Returns the AttributeSet for a given character (at a given index). | ||
| 1012 | * | ||
| 1013 | * @param i the zero-based index into the text | ||
| 1014 | * @return the AttributeSet of the character | ||
| 1015 | */ | ||
| 1016 | public AttributeSet getCharacterAttribute(int i) { | ||
| 1017 | return null; // No attributes in TextComponent | ||
| 1018 | } | ||
| 1019 | |||
| 1020 | /** | ||
| 1021 | * Returns the start offset within the selected text. | ||
| 1022 | * If there is no selection, but there is | ||
| 1023 | * a caret, the start and end offsets will be the same. | ||
| 1024 | * Return 0 if the text is empty, or the caret position | ||
| 1025 | * if no selection. | ||
| 1026 | * | ||
| 1027 | * @return the index into the text of the start of the selection >= 0 | ||
| 1028 | */ | ||
| 1029 | public int getSelectionStart() { | ||
| 1030 | return TextComponent.this.getSelectionStart(); | ||
| 1031 | } | ||
| 1032 | |||
| 1033 | /** | ||
| 1034 | * Returns the end offset within the selected text. | ||
| 1035 | * If there is no selection, but there is | ||
| 1036 | * a caret, the start and end offsets will be the same. | ||
| 1037 | * Return 0 if the text is empty, or the caret position | ||
| 1038 | * if no selection. | ||
| 1039 | * | ||
| 1040 | * @return the index into teh text of the end of the selection >= 0 | ||
| 1041 | */ | ||
| 1042 | public int getSelectionEnd() { | ||
| 1043 | return TextComponent.this.getSelectionEnd(); | ||
| 1044 | } | ||
| 1045 | |||
| 1046 | /** | ||
| 1047 | * Returns the portion of the text that is selected. | ||
| 1048 | * | ||
| 1049 | * @return the text, null if no selection | ||
| 1050 | */ | ||
| 1051 | public String getSelectedText() { | ||
| 1052 | String selText = TextComponent.this.getSelectedText(); | ||
| 1053 | // Fix for 4256662 | ||
| 1054 | if (selText == null || selText.equals("")) { | ||
| 1055 | return null; | ||
| 1056 | } | ||
| 1057 | return selText; | ||
| 1058 | } | ||
| 1059 | |||
| 1060 | /** | ||
| 1061 | * Returns the String at a given index. | ||
| 1062 | * | ||
| 1063 | * @param part the AccessibleText.CHARACTER, AccessibleText.WORD, | ||
| 1064 | * or AccessibleText.SENTENCE to retrieve | ||
| 1065 | * @param index an index within the text >= 0 | ||
| 1066 | * @return the letter, word, or sentence, | ||
| 1067 | * null for an invalid index or part | ||
| 1068 | */ | ||
| 1069 | public String getAtIndex(int part, int index) { | ||
| 1070 | if (index < 0 || index >= TextComponent.this.getText().length()) { | ||
| 1071 | return null; | ||
| 1072 | } | ||
| 1073 | switch (part) { | ||
| 1074 | case AccessibleText.CHARACTER: | ||
| 1075 | return TextComponent.this.getText().substring(index, index+1); | ||
| 1076 | case AccessibleText.WORD: { | ||
| 1077 | String s = TextComponent.this.getText(); | ||
| 1078 | BreakIterator words = BreakIterator.getWordInstance(); | ||
| 1079 | words.setText(s); | ||
| 1080 | int end = words.following(index); | ||
| 1081 | return s.substring(words.previous(), end); | ||
| 1082 | } | ||
| 1083 | case AccessibleText.SENTENCE: { | ||
| 1084 | String s = TextComponent.this.getText(); | ||
| 1085 | BreakIterator sentence = BreakIterator.getSentenceInstance(); | ||
| 1086 | sentence.setText(s); | ||
| 1087 | int end = sentence.following(index); | ||
| 1088 | return s.substring(sentence.previous(), end); | ||
| 1089 | } | ||
| 1090 | default: | ||
| 1091 | return null; | ||
| 1092 | } | ||
| 1093 | } | ||
| 1094 | |||
| 1095 | private static final boolean NEXT = true; | ||
| 1096 | private static final boolean PREVIOUS = false; | ||
| 1097 | |||
| 1098 | /** | ||
| 1099 | * Needed to unify forward and backward searching. | ||
| 1100 | * The method assumes that s is the text assigned to words. | ||
| 1101 | */ | ||
| 1102 | private int findWordLimit(int index, BreakIterator words, boolean direction, | ||
| 1103 | String s) { | ||
| 1104 | // Fix for 4256660 and 4256661. | ||
| 1105 | // Words iterator is different from character and sentence iterators | ||
| 1106 | // in that end of one word is not necessarily start of another word. | ||
| 1107 | // Please see java.text.BreakIterator JavaDoc. The code below is | ||
| 1108 | // based on nextWordStartAfter example from BreakIterator.java. | ||
| 1109 | int last = (direction == NEXT) ? words.following(index) | ||
| 1110 | : words.preceding(index); | ||
| 1111 | int current = (direction == NEXT) ? words.next() | ||
| 1112 | : words.previous(); | ||
| 1113 | while (current != BreakIterator.DONE) { | ||
| 1114 | for (int p = Math.min(last, current); p < Math.max(last, current); p++) { | ||
| 1115 | if (Character.isLetter(s.charAt(p))) { | ||
| 1116 | return last; | ||
| 1117 | } | ||
| 1118 | } | ||
| 1119 | last = current; | ||
| 1120 | current = (direction == NEXT) ? words.next() | ||
| 1121 | : words.previous(); | ||
| 1122 | } | ||
| 1123 | return BreakIterator.DONE; | ||
| 1124 | } | ||
| 1125 | |||
| 1126 | /** | ||
| 1127 | * Returns the String after a given index. | ||
| 1128 | * | ||
| 1129 | * @param part the AccessibleText.CHARACTER, AccessibleText.WORD, | ||
| 1130 | * or AccessibleText.SENTENCE to retrieve | ||
| 1131 | * @param index an index within the text >= 0 | ||
| 1132 | * @return the letter, word, or sentence, null for an invalid | ||
| 1133 | * index or part | ||
| 1134 | */ | ||
| 1135 | public String getAfterIndex(int part, int index) { | ||
| 1136 | if (index < 0 || index >= TextComponent.this.getText().length()) { | ||
| 1137 | return null; | ||
| 1138 | } | ||
| 1139 | switch (part) { | ||
| 1140 | case AccessibleText.CHARACTER: | ||
| 1141 | if (index+1 >= TextComponent.this.getText().length()) { | ||
| 1142 | return null; | ||
| 1143 | } | ||
| 1144 | return TextComponent.this.getText().substring(index+1, index+2); | ||
| 1145 | case AccessibleText.WORD: { | ||
| 1146 | String s = TextComponent.this.getText(); | ||
| 1147 | BreakIterator words = BreakIterator.getWordInstance(); | ||
| 1148 | words.setText(s); | ||
| 1149 | int start = findWordLimit(index, words, NEXT, s); | ||
| 1150 | if (start == BreakIterator.DONE || start >= s.length()) { | ||
| 1151 | return null; | ||
| 1152 | } | ||
| 1153 | int end = words.following(start); | ||
| 1154 | if (end == BreakIterator.DONE || end >= s.length()) { | ||
| 1155 | return null; | ||
| 1156 | } | ||
| 1157 | return s.substring(start, end); | ||
| 1158 | } | ||
| 1159 | case AccessibleText.SENTENCE: { | ||
| 1160 | String s = TextComponent.this.getText(); | ||
| 1161 | BreakIterator sentence = BreakIterator.getSentenceInstance(); | ||
| 1162 | sentence.setText(s); | ||
| 1163 | int start = sentence.following(index); | ||
| 1164 | if (start == BreakIterator.DONE || start >= s.length()) { | ||
| 1165 | return null; | ||
| 1166 | } | ||
| 1167 | int end = sentence.following(start); | ||
| 1168 | if (end == BreakIterator.DONE || end >= s.length()) { | ||
| 1169 | return null; | ||
| 1170 | } | ||
| 1171 | return s.substring(start, end); | ||
| 1172 | } | ||
| 1173 | default: | ||
| 1174 | return null; | ||
| 1175 | } | ||
| 1176 | } | ||
| 1177 | |||
| 1178 | |||
| 1179 | /** | ||
| 1180 | * Returns the String before a given index. | ||
| 1181 | * | ||
| 1182 | * @param part the AccessibleText.CHARACTER, AccessibleText.WORD, | ||
| 1183 | * or AccessibleText.SENTENCE to retrieve | ||
| 1184 | * @param index an index within the text >= 0 | ||
| 1185 | * @return the letter, word, or sentence, null for an invalid index | ||
| 1186 | * or part | ||
| 1187 | */ | ||
| 1188 | public String getBeforeIndex(int part, int index) { | ||
| 1189 | if (index < 0 || index > TextComponent.this.getText().length()-1) { | ||
| 1190 | return null; | ||
| 1191 | } | ||
| 1192 | switch (part) { | ||
| 1193 | case AccessibleText.CHARACTER: | ||
| 1194 | if (index == 0) { | ||
| 1195 | return null; | ||
| 1196 | } | ||
| 1197 | return TextComponent.this.getText().substring(index-1, index); | ||
| 1198 | case AccessibleText.WORD: { | ||
| 1199 | String s = TextComponent.this.getText(); | ||
| 1200 | BreakIterator words = BreakIterator.getWordInstance(); | ||
| 1201 | words.setText(s); | ||
| 1202 | int end = findWordLimit(index, words, PREVIOUS, s); | ||
| 1203 | if (end == BreakIterator.DONE) { | ||
| 1204 | return null; | ||
| 1205 | } | ||
| 1206 | int start = words.preceding(end); | ||
| 1207 | if (start == BreakIterator.DONE) { | ||
| 1208 | return null; | ||
| 1209 | } | ||
| 1210 | return s.substring(start, end); | ||
| 1211 | } | ||
| 1212 | case AccessibleText.SENTENCE: { | ||
| 1213 | String s = TextComponent.this.getText(); | ||
| 1214 | BreakIterator sentence = BreakIterator.getSentenceInstance(); | ||
| 1215 | sentence.setText(s); | ||
| 1216 | int end = sentence.following(index); | ||
| 1217 | end = sentence.previous(); | ||
| 1218 | int start = sentence.previous(); | ||
| 1219 | if (start == BreakIterator.DONE) { | ||
| 1220 | return null; | ||
| 1221 | } | ||
| 1222 | return s.substring(start, end); | ||
| 1223 | } | ||
| 1224 | default: | ||
| 1225 | return null; | ||
| 1226 | } | ||
| 1227 | } | ||
| 1228 | } // end of AccessibleAWTTextComponent | ||
| 1229 | |||
| 1230 | private boolean checkForEnableIM = true; | ||
| 1231 | } | ||