J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2006 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 | package java.awt; |
| 26 | |
| 27 | import java.awt.event.InputEvent; |
| 28 | import java.awt.event.KeyEvent; |
| 29 | import java.awt.peer.TextAreaPeer; |
| 30 | import java.io.ObjectOutputStream; |
| 31 | import java.io.ObjectInputStream; |
| 32 | import java.io.IOException; |
| 33 | import java.util.HashSet; |
| 34 | import java.util.Set; |
| 35 | import javax.accessibility.*; |
| 36 | |
| 37 | /** |
| 38 | * A <code>TextArea</code> object is a multi-line region |
| 39 | * that displays text. It can be set to allow editing or |
| 40 | * to be read-only. |
| 41 | * <p> |
| 42 | * The following image shows the appearance of a text area: |
| 43 | * <p> |
| 44 | * <img src="doc-files/TextArea-1.gif" alt="A TextArea showing the word 'Hello!'" |
| 45 | * ALIGN=center HSPACE=10 VSPACE=7> |
| 46 | * <p> |
| 47 | * This text area could be created by the following line of code: |
| 48 | * <p> |
| 49 | * <hr><blockquote><pre> |
| 50 | * new TextArea("Hello", 5, 40); |
| 51 | * </pre></blockquote><hr> |
| 52 | * <p> |
| 53 | * @author Sami Shaio |
| 54 | * @since JDK1.0 |
| 55 | */ |
| 56 | public class TextArea extends TextComponent { |
| 57 | |
| 58 | /** |
| 59 | * The number of rows in the <code>TextArea</code>. |
| 60 | * This parameter will determine the text area's height. |
| 61 | * Guaranteed to be non-negative. |
| 62 | * |
| 63 | * @serial |
| 64 | * @see #getRows() |
| 65 | * @see #setRows(int) |
| 66 | */ |
| 67 | int rows; |
| 68 | |
| 69 | /** |
| 70 | * The number of columns in the <code>TextArea</code>. |
| 71 | * A column is an approximate average character |
| 72 | * width that is platform-dependent. |
| 73 | * This parameter will determine the text area's width. |
| 74 | * Guaranteed to be non-negative. |
| 75 | * |
| 76 | * @serial |
| 77 | * @see #setColumns(int) |
| 78 | * @see #getColumns() |
| 79 | */ |
| 80 | int columns; |
| 81 | |
| 82 | private static final String base = "text"; |
| 83 | private static int nameCounter = 0; |
| 84 | |
| 85 | /** |
| 86 | * Create and display both vertical and horizontal scrollbars. |
| 87 | * @since JDK1.1 |
| 88 | */ |
| 89 | public static final int SCROLLBARS_BOTH = 0; |
| 90 | |
| 91 | /** |
| 92 | * Create and display vertical scrollbar only. |
| 93 | * @since JDK1.1 |
| 94 | */ |
| 95 | public static final int SCROLLBARS_VERTICAL_ONLY = 1; |
| 96 | |
| 97 | /** |
| 98 | * Create and display horizontal scrollbar only. |
| 99 | * @since JDK1.1 |
| 100 | */ |
| 101 | public static final int SCROLLBARS_HORIZONTAL_ONLY = 2; |
| 102 | |
| 103 | /** |
| 104 | * Do not create or display any scrollbars for the text area. |
| 105 | * @since JDK1.1 |
| 106 | */ |
| 107 | public static final int SCROLLBARS_NONE = 3; |
| 108 | |
| 109 | /** |
| 110 | * Determines which scrollbars are created for the |
| 111 | * text area. It can be one of four values : |
| 112 | * <code>SCROLLBARS_BOTH</code> = both scrollbars.<BR> |
| 113 | * <code>SCROLLBARS_HORIZONTAL_ONLY</code> = Horizontal bar only.<BR> |
| 114 | * <code>SCROLLBARS_VERTICAL_ONLY</code> = Vertical bar only.<BR> |
| 115 | * <code>SCROLLBARS_NONE</code> = No scrollbars.<BR> |
| 116 | * |
| 117 | * @serial |
| 118 | * @see #getScrollbarVisibility() |
| 119 | */ |
| 120 | private int scrollbarVisibility; |
| 121 | |
| 122 | /** |
| 123 | * Cache the Sets of forward and backward traversal keys so we need not |
| 124 | * look them up each time. |
| 125 | */ |
| 126 | private static Set forwardTraversalKeys, backwardTraversalKeys; |
| 127 | |
| 128 | /* |
| 129 | * JDK 1.1 serialVersionUID |
| 130 | */ |
| 131 | private static final long serialVersionUID = 3692302836626095722L; |
| 132 | |
| 133 | /** |
| 134 | * Initialize JNI field and method ids |
| 135 | */ |
| 136 | private static native void initIDs(); |
| 137 | |
| 138 | static { |
| 139 | /* ensure that the necessary native libraries are loaded */ |
| 140 | Toolkit.loadLibraries(); |
| 141 | if (!GraphicsEnvironment.isHeadless()) { |
| 142 | initIDs(); |
| 143 | } |
| 144 | forwardTraversalKeys = KeyboardFocusManager.initFocusTraversalKeysSet( |
| 145 | "ctrl TAB", |
| 146 | new HashSet()); |
| 147 | backwardTraversalKeys = KeyboardFocusManager.initFocusTraversalKeysSet( |
| 148 | "ctrl shift TAB", |
| 149 | new HashSet()); |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Constructs a new text area with the empty string as text. |
| 154 | * This text area is created with scrollbar visibility equal to |
| 155 | * {@link #SCROLLBARS_BOTH}, so both vertical and horizontal |
| 156 | * scrollbars will be visible for this text area. |
| 157 | * @exception HeadlessException if |
| 158 | * <code>GraphicsEnvironment.isHeadless</code> returns true |
| 159 | * @see java.awt.GraphicsEnvironment#isHeadless() |
| 160 | */ |
| 161 | public TextArea() throws HeadlessException { |
| 162 | this("", 0, 0, SCROLLBARS_BOTH); |
| 163 | } |
| 164 | |
| 165 | /** |
| 166 | * Constructs a new text area with the specified text. |
| 167 | * This text area is created with scrollbar visibility equal to |
| 168 | * {@link #SCROLLBARS_BOTH}, so both vertical and horizontal |
| 169 | * scrollbars will be visible for this text area. |
| 170 | * @param text the text to be displayed; if |
| 171 | * <code>text</code> is <code>null</code>, the empty |
| 172 | * string <code>""</code> will be displayed |
| 173 | * @exception HeadlessException if |
| 174 | * <code>GraphicsEnvironment.isHeadless</code> returns true |
| 175 | * @see java.awt.GraphicsEnvironment#isHeadless() |
| 176 | */ |
| 177 | public TextArea(String text) throws HeadlessException { |
| 178 | this(text, 0, 0, SCROLLBARS_BOTH); |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Constructs a new text area with the specified number of |
| 183 | * rows and columns and the empty string as text. |
| 184 | * A column is an approximate average character |
| 185 | * width that is platform-dependent. The text area is created with |
| 186 | * scrollbar visibility equal to {@link #SCROLLBARS_BOTH}, so both |
| 187 | * vertical and horizontal scrollbars will be visible for this |
| 188 | * text area. |
| 189 | * @param rows the number of rows |
| 190 | * @param columns the number of columns |
| 191 | * @exception HeadlessException if |
| 192 | * <code>GraphicsEnvironment.isHeadless</code> returns true |
| 193 | * @see java.awt.GraphicsEnvironment#isHeadless() |
| 194 | */ |
| 195 | public TextArea(int rows, int columns) throws HeadlessException { |
| 196 | this("", rows, columns, SCROLLBARS_BOTH); |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Constructs a new text area with the specified text, |
| 201 | * and with the specified number of rows and columns. |
| 202 | * A column is an approximate average character |
| 203 | * width that is platform-dependent. The text area is created with |
| 204 | * scrollbar visibility equal to {@link #SCROLLBARS_BOTH}, so both |
| 205 | * vertical and horizontal scrollbars will be visible for this |
| 206 | * text area. |
| 207 | * @param text the text to be displayed; if |
| 208 | * <code>text</code> is <code>null</code>, the empty |
| 209 | * string <code>""</code> will be displayed |
| 210 | * @param rows the number of rows |
| 211 | * @param columns the number of columns |
| 212 | * @exception HeadlessException if |
| 213 | * <code>GraphicsEnvironment.isHeadless</code> returns true |
| 214 | * @see java.awt.GraphicsEnvironment#isHeadless() |
| 215 | */ |
| 216 | public TextArea(String text, int rows, int columns) |
| 217 | throws HeadlessException { |
| 218 | this(text, rows, columns, SCROLLBARS_BOTH); |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Constructs a new text area with the specified text, |
| 223 | * and with the rows, columns, and scroll bar visibility |
| 224 | * as specified. All <code>TextArea</code> constructors defer to |
| 225 | * this one. |
| 226 | * <p> |
| 227 | * The <code>TextArea</code> class defines several constants |
| 228 | * that can be supplied as values for the |
| 229 | * <code>scrollbars</code> argument: |
| 230 | * <ul> |
| 231 | * <li><code>SCROLLBARS_BOTH</code>, |
| 232 | * <li><code>SCROLLBARS_VERTICAL_ONLY</code>, |
| 233 | * <li><code>SCROLLBARS_HORIZONTAL_ONLY</code>, |
| 234 | * <li><code>SCROLLBARS_NONE</code>. |
| 235 | * </ul> |
| 236 | * Any other value for the |
| 237 | * <code>scrollbars</code> argument is invalid and will result in |
| 238 | * this text area being created with scrollbar visibility equal to |
| 239 | * the default value of {@link #SCROLLBARS_BOTH}. |
| 240 | * @param text the text to be displayed; if |
| 241 | * <code>text</code> is <code>null</code>, the empty |
| 242 | * string <code>""</code> will be displayed |
| 243 | * @param rows the number of rows; if |
| 244 | * <code>rows</code> is less than <code>0</code>, |
| 245 | * <code>rows</code> is set to <code>0</code> |
| 246 | * @param columns the number of columns; if |
| 247 | * <code>columns</code> is less than <code>0</code>, |
| 248 | * <code>columns</code> is set to <code>0</code> |
| 249 | * @param scrollbars a constant that determines what |
| 250 | * scrollbars are created to view the text area |
| 251 | * @since JDK1.1 |
| 252 | * @exception HeadlessException if |
| 253 | * <code>GraphicsEnvironment.isHeadless</code> returns true |
| 254 | * @see java.awt.GraphicsEnvironment#isHeadless() |
| 255 | */ |
| 256 | public TextArea(String text, int rows, int columns, int scrollbars) |
| 257 | throws HeadlessException { |
| 258 | super(text); |
| 259 | |
| 260 | this.rows = (rows >= 0) ? rows : 0; |
| 261 | this.columns = (columns >= 0) ? columns : 0; |
| 262 | |
| 263 | if (scrollbars >= SCROLLBARS_BOTH && scrollbars <= SCROLLBARS_NONE) { |
| 264 | this.scrollbarVisibility = scrollbars; |
| 265 | } else { |
| 266 | this.scrollbarVisibility = SCROLLBARS_BOTH; |
| 267 | } |
| 268 | |
| 269 | setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, |
| 270 | forwardTraversalKeys); |
| 271 | setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, |
| 272 | backwardTraversalKeys); |
| 273 | } |
| 274 | |
| 275 | /** |
| 276 | * Construct a name for this component. Called by <code>getName</code> |
| 277 | * when the name is <code>null</code>. |
| 278 | */ |
| 279 | String constructComponentName() { |
| 280 | synchronized (TextArea.class) { |
| 281 | return base + nameCounter++; |
| 282 | } |
| 283 | } |
| 284 | |
| 285 | /** |
| 286 | * Creates the <code>TextArea</code>'s peer. The peer allows us to modify |
| 287 | * the appearance of the <code>TextArea</code> without changing any of its |
| 288 | * functionality. |
| 289 | */ |
| 290 | public void addNotify() { |
| 291 | synchronized (getTreeLock()) { |
| 292 | if (peer == null) |
| 293 | peer = getToolkit().createTextArea(this); |
| 294 | super.addNotify(); |
| 295 | } |
| 296 | } |
| 297 | |
| 298 | /** |
| 299 | * Inserts the specified text at the specified position |
| 300 | * in this text area. |
| 301 | * <p>Note that passing <code>null</code> or inconsistent |
| 302 | * parameters is invalid and will result in unspecified |
| 303 | * behavior. |
| 304 | * |
| 305 | * @param str the non-<code>null</code> text to insert |
| 306 | * @param pos the position at which to insert |
| 307 | * @see java.awt.TextComponent#setText |
| 308 | * @see java.awt.TextArea#replaceRange |
| 309 | * @see java.awt.TextArea#append |
| 310 | * @since JDK1.1 |
| 311 | */ |
| 312 | public void insert(String str, int pos) { |
| 313 | insertText(str, pos); |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * @deprecated As of JDK version 1.1, |
| 318 | * replaced by <code>insert(String, int)</code>. |
| 319 | */ |
| 320 | @Deprecated |
| 321 | public synchronized void insertText(String str, int pos) { |
| 322 | TextAreaPeer peer = (TextAreaPeer)this.peer; |
| 323 | if (peer != null) { |
| 324 | peer.insertText(str, pos); |
| 325 | } else { |
| 326 | text = text.substring(0, pos) + str + text.substring(pos); |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * Appends the given text to the text area's current text. |
| 332 | * <p>Note that passing <code>null</code> or inconsistent |
| 333 | * parameters is invalid and will result in unspecified |
| 334 | * behavior. |
| 335 | * |
| 336 | * @param str the non-<code>null</code> text to append |
| 337 | * @see java.awt.TextArea#insert |
| 338 | * @since JDK1.1 |
| 339 | */ |
| 340 | public void append(String str) { |
| 341 | appendText(str); |
| 342 | } |
| 343 | |
| 344 | /** |
| 345 | * @deprecated As of JDK version 1.1, |
| 346 | * replaced by <code>append(String)</code>. |
| 347 | */ |
| 348 | @Deprecated |
| 349 | public synchronized void appendText(String str) { |
| 350 | if (peer != null) { |
| 351 | insertText(str, getText().length()); |
| 352 | } else { |
| 353 | text = text + str; |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | /** |
| 358 | * Replaces text between the indicated start and end positions |
| 359 | * with the specified replacement text. The text at the end |
| 360 | * position will not be replaced. The text at the start |
| 361 | * position will be replaced (unless the start position is the |
| 362 | * same as the end position). |
| 363 | * The text position is zero-based. The inserted substring may be |
| 364 | * of a different length than the text it replaces. |
| 365 | * <p>Note that passing <code>null</code> or inconsistent |
| 366 | * parameters is invalid and will result in unspecified |
| 367 | * behavior. |
| 368 | * |
| 369 | * @param str the non-<code>null</code> text to use as |
| 370 | * the replacement |
| 371 | * @param start the start position |
| 372 | * @param end the end position |
| 373 | * @see java.awt.TextArea#insert |
| 374 | * @since JDK1.1 |
| 375 | */ |
| 376 | public void replaceRange(String str, int start, int end) { |
| 377 | replaceText(str, start, end); |
| 378 | } |
| 379 | |
| 380 | /** |
| 381 | * @deprecated As of JDK version 1.1, |
| 382 | * replaced by <code>replaceRange(String, int, int)</code>. |
| 383 | */ |
| 384 | @Deprecated |
| 385 | public synchronized void replaceText(String str, int start, int end) { |
| 386 | TextAreaPeer peer = (TextAreaPeer)this.peer; |
| 387 | if (peer != null) { |
| 388 | peer.replaceText(str, start, end); |
| 389 | } else { |
| 390 | text = text.substring(0, start) + str + text.substring(end); |
| 391 | } |
| 392 | } |
| 393 | |
| 394 | /** |
| 395 | * Returns the number of rows in the text area. |
| 396 | * @return the number of rows in the text area |
| 397 | * @see #setRows(int) |
| 398 | * @see #getColumns() |
| 399 | * @since JDK1 |
| 400 | */ |
| 401 | public int getRows() { |
| 402 | return rows; |
| 403 | } |
| 404 | |
| 405 | /** |
| 406 | * Sets the number of rows for this text area. |
| 407 | * @param rows the number of rows |
| 408 | * @see #getRows() |
| 409 | * @see #setColumns(int) |
| 410 | * @exception IllegalArgumentException if the value |
| 411 | * supplied for <code>rows</code> |
| 412 | * is less than <code>0</code> |
| 413 | * @since JDK1.1 |
| 414 | */ |
| 415 | public void setRows(int rows) { |
| 416 | int oldVal = this.rows; |
| 417 | if (rows < 0) { |
| 418 | throw new IllegalArgumentException("rows less than zero."); |
| 419 | } |
| 420 | if (rows != oldVal) { |
| 421 | this.rows = rows; |
| 422 | invalidate(); |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | /** |
| 427 | * Returns the number of columns in this text area. |
| 428 | * @return the number of columns in the text area |
| 429 | * @see #setColumns(int) |
| 430 | * @see #getRows() |
| 431 | */ |
| 432 | public int getColumns() { |
| 433 | return columns; |
| 434 | } |
| 435 | |
| 436 | /** |
| 437 | * Sets the number of columns for this text area. |
| 438 | * @param columns the number of columns |
| 439 | * @see #getColumns() |
| 440 | * @see #setRows(int) |
| 441 | * @exception IllegalArgumentException if the value |
| 442 | * supplied for <code>columns</code> |
| 443 | * is less than <code>0</code> |
| 444 | * @since JDK1.1 |
| 445 | */ |
| 446 | public void setColumns(int columns) { |
| 447 | int oldVal = this.columns; |
| 448 | if (columns < 0) { |
| 449 | throw new IllegalArgumentException("columns less than zero."); |
| 450 | } |
| 451 | if (columns != oldVal) { |
| 452 | this.columns = columns; |
| 453 | invalidate(); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | /** |
| 458 | * Returns an enumerated value that indicates which scroll bars |
| 459 | * the text area uses. |
| 460 | * <p> |
| 461 | * The <code>TextArea</code> class defines four integer constants |
| 462 | * that are used to specify which scroll bars are available. |
| 463 | * <code>TextArea</code> has one constructor that gives the |
| 464 | * application discretion over scroll bars. |
| 465 | * |
| 466 | * @return an integer that indicates which scroll bars are used |
| 467 | * @see java.awt.TextArea#SCROLLBARS_BOTH |
| 468 | * @see java.awt.TextArea#SCROLLBARS_VERTICAL_ONLY |
| 469 | * @see java.awt.TextArea#SCROLLBARS_HORIZONTAL_ONLY |
| 470 | * @see java.awt.TextArea#SCROLLBARS_NONE |
| 471 | * @see java.awt.TextArea#TextArea(java.lang.String, int, int, int) |
| 472 | * @since JDK1.1 |
| 473 | */ |
| 474 | public int getScrollbarVisibility() { |
| 475 | return scrollbarVisibility; |
| 476 | } |
| 477 | |
| 478 | |
| 479 | /** |
| 480 | * Determines the preferred size of a text area with the specified |
| 481 | * number of rows and columns. |
| 482 | * @param rows the number of rows |
| 483 | * @param columns the number of columns |
| 484 | * @return the preferred dimensions required to display |
| 485 | * the text area with the specified |
| 486 | * number of rows and columns |
| 487 | * @see java.awt.Component#getPreferredSize |
| 488 | * @since JDK1.1 |
| 489 | */ |
| 490 | public Dimension getPreferredSize(int rows, int columns) { |
| 491 | return preferredSize(rows, columns); |
| 492 | } |
| 493 | |
| 494 | /** |
| 495 | * @deprecated As of JDK version 1.1, |
| 496 | * replaced by <code>getPreferredSize(int, int)</code>. |
| 497 | */ |
| 498 | @Deprecated |
| 499 | public Dimension preferredSize(int rows, int columns) { |
| 500 | synchronized (getTreeLock()) { |
| 501 | TextAreaPeer peer = (TextAreaPeer)this.peer; |
| 502 | return (peer != null) ? |
| 503 | peer.preferredSize(rows, columns) : |
| 504 | super.preferredSize(); |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | /** |
| 509 | * Determines the preferred size of this text area. |
| 510 | * @return the preferred dimensions needed for this text area |
| 511 | * @see java.awt.Component#getPreferredSize |
| 512 | * @since JDK1.1 |
| 513 | */ |
| 514 | public Dimension getPreferredSize() { |
| 515 | return preferredSize(); |
| 516 | } |
| 517 | |
| 518 | /** |
| 519 | * @deprecated As of JDK version 1.1, |
| 520 | * replaced by <code>getPreferredSize()</code>. |
| 521 | */ |
| 522 | @Deprecated |
| 523 | public Dimension preferredSize() { |
| 524 | synchronized (getTreeLock()) { |
| 525 | return ((rows > 0) && (columns > 0)) ? |
| 526 | preferredSize(rows, columns) : |
| 527 | super.preferredSize(); |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | /** |
| 532 | * Determines the minimum size of a text area with the specified |
| 533 | * number of rows and columns. |
| 534 | * @param rows the number of rows |
| 535 | * @param columns the number of columns |
| 536 | * @return the minimum dimensions required to display |
| 537 | * the text area with the specified |
| 538 | * number of rows and columns |
| 539 | * @see java.awt.Component#getMinimumSize |
| 540 | * @since JDK1.1 |
| 541 | */ |
| 542 | public Dimension getMinimumSize(int rows, int columns) { |
| 543 | return minimumSize(rows, columns); |
| 544 | } |
| 545 | |
| 546 | /** |
| 547 | * @deprecated As of JDK version 1.1, |
| 548 | * replaced by <code>getMinimumSize(int, int)</code>. |
| 549 | */ |
| 550 | @Deprecated |
| 551 | public Dimension minimumSize(int rows, int columns) { |
| 552 | synchronized (getTreeLock()) { |
| 553 | TextAreaPeer peer = (TextAreaPeer)this.peer; |
| 554 | return (peer != null) ? |
| 555 | peer.minimumSize(rows, columns) : |
| 556 | super.minimumSize(); |
| 557 | } |
| 558 | } |
| 559 | |
| 560 | /** |
| 561 | * Determines the minimum size of this text area. |
| 562 | * @return the preferred dimensions needed for this text area |
| 563 | * @see java.awt.Component#getPreferredSize |
| 564 | * @since JDK1.1 |
| 565 | */ |
| 566 | public Dimension getMinimumSize() { |
| 567 | return minimumSize(); |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | * @deprecated As of JDK version 1.1, |
| 572 | * replaced by <code>getMinimumSize()</code>. |
| 573 | */ |
| 574 | @Deprecated |
| 575 | public Dimension minimumSize() { |
| 576 | synchronized (getTreeLock()) { |
| 577 | return ((rows > 0) && (columns > 0)) ? |
| 578 | minimumSize(rows, columns) : |
| 579 | super.minimumSize(); |
| 580 | } |
| 581 | } |
| 582 | |
| 583 | /** |
| 584 | * Returns a string representing the state of this <code>TextArea</code>. |
| 585 | * This method is intended to be used only for debugging purposes, and the |
| 586 | * content and format of the returned string may vary between |
| 587 | * implementations. The returned string may be empty but may not be |
| 588 | * <code>null</code>. |
| 589 | * |
| 590 | * @return the parameter string of this text area |
| 591 | */ |
| 592 | protected String paramString() { |
| 593 | String sbVisStr; |
| 594 | switch (scrollbarVisibility) { |
| 595 | case SCROLLBARS_BOTH: |
| 596 | sbVisStr = "both"; |
| 597 | break; |
| 598 | case SCROLLBARS_VERTICAL_ONLY: |
| 599 | sbVisStr = "vertical-only"; |
| 600 | break; |
| 601 | case SCROLLBARS_HORIZONTAL_ONLY: |
| 602 | sbVisStr = "horizontal-only"; |
| 603 | break; |
| 604 | case SCROLLBARS_NONE: |
| 605 | sbVisStr = "none"; |
| 606 | break; |
| 607 | default: |
| 608 | sbVisStr = "invalid display policy"; |
| 609 | } |
| 610 | |
| 611 | return super.paramString() + ",rows=" + rows + |
| 612 | ",columns=" + columns + |
| 613 | ",scrollbarVisibility=" + sbVisStr; |
| 614 | } |
| 615 | |
| 616 | |
| 617 | /* |
| 618 | * Serialization support. |
| 619 | */ |
| 620 | /** |
| 621 | * The textArea Serialized Data Version. |
| 622 | * |
| 623 | * @serial |
| 624 | */ |
| 625 | private int textAreaSerializedDataVersion = 2; |
| 626 | |
| 627 | /** |
| 628 | * Read the ObjectInputStream. |
| 629 | * @exception HeadlessException if |
| 630 | * <code>GraphicsEnvironment.isHeadless()</code> returns |
| 631 | * <code>true</code> |
| 632 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 633 | */ |
| 634 | private void readObject(ObjectInputStream s) |
| 635 | throws ClassNotFoundException, IOException, HeadlessException |
| 636 | { |
| 637 | // HeadlessException will be thrown by TextComponent's readObject |
| 638 | s.defaultReadObject(); |
| 639 | |
| 640 | // Make sure the state we just read in for columns, rows, |
| 641 | // and scrollbarVisibility has legal values |
| 642 | if (columns < 0) { |
| 643 | columns = 0; |
| 644 | } |
| 645 | if (rows < 0) { |
| 646 | rows = 0; |
| 647 | } |
| 648 | |
| 649 | if ((scrollbarVisibility < SCROLLBARS_BOTH) || |
| 650 | (scrollbarVisibility > SCROLLBARS_NONE)) { |
| 651 | this.scrollbarVisibility = SCROLLBARS_BOTH; |
| 652 | } |
| 653 | |
| 654 | if (textAreaSerializedDataVersion < 2) { |
| 655 | setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS, |
| 656 | forwardTraversalKeys); |
| 657 | setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, |
| 658 | backwardTraversalKeys); |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | |
| 663 | ///////////////// |
| 664 | // Accessibility support |
| 665 | //////////////// |
| 666 | |
| 667 | |
| 668 | /** |
| 669 | * Returns the <code>AccessibleContext</code> associated with |
| 670 | * this <code>TextArea</code>. For text areas, the |
| 671 | * <code>AccessibleContext</code> takes the form of an |
| 672 | * <code>AccessibleAWTTextArea</code>. |
| 673 | * A new <code>AccessibleAWTTextArea</code> instance is created if necessary. |
| 674 | * |
| 675 | * @return an <code>AccessibleAWTTextArea</code> that serves as the |
| 676 | * <code>AccessibleContext</code> of this <code>TextArea</code> |
| 677 | * @since 1.3 |
| 678 | */ |
| 679 | public AccessibleContext getAccessibleContext() { |
| 680 | if (accessibleContext == null) { |
| 681 | accessibleContext = new AccessibleAWTTextArea(); |
| 682 | } |
| 683 | return accessibleContext; |
| 684 | } |
| 685 | |
| 686 | /** |
| 687 | * This class implements accessibility support for the |
| 688 | * <code>TextArea</code> class. It provides an implementation of the |
| 689 | * Java Accessibility API appropriate to text area user-interface elements. |
| 690 | * @since 1.3 |
| 691 | */ |
| 692 | protected class AccessibleAWTTextArea extends AccessibleAWTTextComponent |
| 693 | { |
| 694 | /* |
| 695 | * JDK 1.3 serialVersionUID |
| 696 | */ |
| 697 | private static final long serialVersionUID = 3472827823632144419L; |
| 698 | |
| 699 | /** |
| 700 | * Gets the state set of this object. |
| 701 | * |
| 702 | * @return an instance of AccessibleStateSet describing the states |
| 703 | * of the object |
| 704 | * @see AccessibleStateSet |
| 705 | */ |
| 706 | public AccessibleStateSet getAccessibleStateSet() { |
| 707 | AccessibleStateSet states = super.getAccessibleStateSet(); |
| 708 | states.add(AccessibleState.MULTI_LINE); |
| 709 | return states; |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | |
| 714 | } |