J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1995-2007 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.peer.TextFieldPeer; |
| 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 javax.accessibility.*; |
| 34 | |
| 35 | |
| 36 | /** |
| 37 | * A <code>TextField</code> object is a text component |
| 38 | * that allows for the editing of a single line of text. |
| 39 | * <p> |
| 40 | * For example, the following image depicts a frame with four |
| 41 | * text fields of varying widths. Two of these text fields |
| 42 | * display the predefined text <code>"Hello"</code>. |
| 43 | * <p> |
| 44 | * <img src="doc-files/TextField-1.gif" alt="The preceding text describes this image." |
| 45 | * ALIGN=center HSPACE=10 VSPACE=7> |
| 46 | * <p> |
| 47 | * Here is the code that produces these four text fields: |
| 48 | * <p> |
| 49 | * <hr><blockquote><pre> |
| 50 | * TextField tf1, tf2, tf3, tf4; |
| 51 | * // a blank text field |
| 52 | * tf1 = new TextField(); |
| 53 | * // blank field of 20 columns |
| 54 | * tf2 = new TextField("", 20); |
| 55 | * // predefined text displayed |
| 56 | * tf3 = new TextField("Hello!"); |
| 57 | * // predefined text in 30 columns |
| 58 | * tf4 = new TextField("Hello", 30); |
| 59 | * </pre></blockquote><hr> |
| 60 | * <p> |
| 61 | * Every time the user types a key in the text field, one or |
| 62 | * more key events are sent to the text field. A <code>KeyEvent</code> |
| 63 | * may be one of three types: keyPressed, keyReleased, or keyTyped. |
| 64 | * The properties of a key event indicate which of these types |
| 65 | * it is, as well as additional information about the event, |
| 66 | * such as what modifiers are applied to the key event and the |
| 67 | * time at which the event occurred. |
| 68 | * <p> |
| 69 | * The key event is passed to every <code>KeyListener</code> |
| 70 | * or <code>KeyAdapter</code> object which registered to receive such |
| 71 | * events using the component's <code>addKeyListener</code> method. |
| 72 | * (<code>KeyAdapter</code> objects implement the |
| 73 | * <code>KeyListener</code> interface.) |
| 74 | * <p> |
| 75 | * It is also possible to fire an <code>ActionEvent</code>. |
| 76 | * If action events are enabled for the text field, they may |
| 77 | * be fired by pressing the <code>Return</code> key. |
| 78 | * <p> |
| 79 | * The <code>TextField</code> class's <code>processEvent</code> |
| 80 | * method examines the action event and passes it along to |
| 81 | * <code>processActionEvent</code>. The latter method redirects the |
| 82 | * event to any <code>ActionListener</code> objects that have |
| 83 | * registered to receive action events generated by this |
| 84 | * text field. |
| 85 | * |
| 86 | * @author Sami Shaio |
| 87 | * @see java.awt.event.KeyEvent |
| 88 | * @see java.awt.event.KeyAdapter |
| 89 | * @see java.awt.event.KeyListener |
| 90 | * @see java.awt.event.ActionEvent |
| 91 | * @see java.awt.Component#addKeyListener |
| 92 | * @see java.awt.TextField#processEvent |
| 93 | * @see java.awt.TextField#processActionEvent |
| 94 | * @see java.awt.TextField#addActionListener |
| 95 | * @since JDK1.0 |
| 96 | */ |
| 97 | public class TextField extends TextComponent { |
| 98 | |
| 99 | /** |
| 100 | * The number of columns in the text field. |
| 101 | * A column is an approximate average character |
| 102 | * width that is platform-dependent. |
| 103 | * Guaranteed to be non-negative. |
| 104 | * |
| 105 | * @serial |
| 106 | * @see #setColumns(int) |
| 107 | * @see #getColumns() |
| 108 | */ |
| 109 | int columns; |
| 110 | |
| 111 | /** |
| 112 | * The echo character, which is used when |
| 113 | * the user wishes to disguise the characters |
| 114 | * typed into the text field. |
| 115 | * The disguises are removed if echoChar = <code>0</code>. |
| 116 | * |
| 117 | * @serial |
| 118 | * @see #getEchoChar() |
| 119 | * @see #setEchoChar(char) |
| 120 | * @see #echoCharIsSet() |
| 121 | */ |
| 122 | char echoChar; |
| 123 | |
| 124 | transient ActionListener actionListener; |
| 125 | |
| 126 | private static final String base = "textfield"; |
| 127 | private static int nameCounter = 0; |
| 128 | |
| 129 | /* |
| 130 | * JDK 1.1 serialVersionUID |
| 131 | */ |
| 132 | private static final long serialVersionUID = -2966288784432217853L; |
| 133 | |
| 134 | /** |
| 135 | * Initialize JNI field and method ids |
| 136 | */ |
| 137 | private static native void initIDs(); |
| 138 | |
| 139 | static { |
| 140 | /* ensure that the necessary native libraries are loaded */ |
| 141 | Toolkit.loadLibraries(); |
| 142 | if (!GraphicsEnvironment.isHeadless()) { |
| 143 | initIDs(); |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | /** |
| 148 | * Constructs a new text field. |
| 149 | * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| 150 | * returns true. |
| 151 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 152 | */ |
| 153 | public TextField() throws HeadlessException { |
| 154 | this("", 0); |
| 155 | } |
| 156 | |
| 157 | /** |
| 158 | * Constructs a new text field initialized with the specified text. |
| 159 | * @param text the text to be displayed. If |
| 160 | * <code>text</code> is <code>null</code>, the empty |
| 161 | * string <code>""</code> will be displayed. |
| 162 | * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| 163 | * returns true. |
| 164 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 165 | */ |
| 166 | public TextField(String text) throws HeadlessException { |
| 167 | this(text, (text != null) ? text.length() : 0); |
| 168 | } |
| 169 | |
| 170 | /** |
| 171 | * Constructs a new empty text field with the specified number |
| 172 | * of columns. A column is an approximate average character |
| 173 | * width that is platform-dependent. |
| 174 | * @param columns the number of columns. If |
| 175 | * <code>columns</code> is less than <code>0</code>, |
| 176 | * <code>columns</code> is set to <code>0</code>. |
| 177 | * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| 178 | * returns true. |
| 179 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 180 | */ |
| 181 | public TextField(int columns) throws HeadlessException { |
| 182 | this("", columns); |
| 183 | } |
| 184 | |
| 185 | /** |
| 186 | * Constructs a new text field initialized with the specified text |
| 187 | * to be displayed, and wide enough to hold the specified |
| 188 | * number of columns. A column is an approximate average character |
| 189 | * width that is platform-dependent. |
| 190 | * @param text the text to be displayed. If |
| 191 | * <code>text</code> is <code>null</code>, the empty |
| 192 | * string <code>""</code> will be displayed. |
| 193 | * @param columns the number of columns. If |
| 194 | * <code>columns</code> is less than <code>0</code>, |
| 195 | * <code>columns</code> is set to <code>0</code>. |
| 196 | * @exception HeadlessException if GraphicsEnvironment.isHeadless() |
| 197 | * returns true. |
| 198 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 199 | */ |
| 200 | public TextField(String text, int columns) throws HeadlessException { |
| 201 | super(text); |
| 202 | this.columns = (columns >= 0) ? columns : 0; |
| 203 | } |
| 204 | |
| 205 | /** |
| 206 | * Construct a name for this component. Called by getName() when the |
| 207 | * name is null. |
| 208 | */ |
| 209 | String constructComponentName() { |
| 210 | synchronized (TextField.class) { |
| 211 | return base + nameCounter++; |
| 212 | } |
| 213 | } |
| 214 | |
| 215 | /** |
| 216 | * Creates the TextField's peer. The peer allows us to modify the |
| 217 | * appearance of the TextField without changing its functionality. |
| 218 | */ |
| 219 | public void addNotify() { |
| 220 | synchronized (getTreeLock()) { |
| 221 | if (peer == null) |
| 222 | peer = getToolkit().createTextField(this); |
| 223 | super.addNotify(); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Gets the character that is to be used for echoing. |
| 229 | * <p> |
| 230 | * An echo character is useful for text fields where |
| 231 | * user input should not be echoed to the screen, as in |
| 232 | * the case of a text field for entering a password. |
| 233 | * If <code>echoChar</code> = <code>0</code>, user |
| 234 | * input is echoed to the screen unchanged. |
| 235 | * <p> |
| 236 | * A Java platform implementation may support only a limited, |
| 237 | * non-empty set of echo characters. This function returns the |
| 238 | * echo character originally requested via setEchoChar(). The echo |
| 239 | * character actually used by the TextField implementation might be |
| 240 | * different. |
| 241 | * @return the echo character for this text field. |
| 242 | * @see java.awt.TextField#echoCharIsSet |
| 243 | * @see java.awt.TextField#setEchoChar |
| 244 | */ |
| 245 | public char getEchoChar() { |
| 246 | return echoChar; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * Sets the echo character for this text field. |
| 251 | * <p> |
| 252 | * An echo character is useful for text fields where |
| 253 | * user input should not be echoed to the screen, as in |
| 254 | * the case of a text field for entering a password. |
| 255 | * Setting <code>echoChar</code> = <code>0</code> allows |
| 256 | * user input to be echoed to the screen again. |
| 257 | * <p> |
| 258 | * A Java platform implementation may support only a limited, |
| 259 | * non-empty set of echo characters. Attempts to set an |
| 260 | * unsupported echo character will cause the default echo |
| 261 | * character to be used instead. Subsequent calls to getEchoChar() |
| 262 | * will return the echo character originally requested. This might |
| 263 | * or might not be identical to the echo character actually |
| 264 | * used by the TextField implementation. |
| 265 | * @param c the echo character for this text field. |
| 266 | * @see java.awt.TextField#echoCharIsSet |
| 267 | * @see java.awt.TextField#getEchoChar |
| 268 | * @since JDK1.1 |
| 269 | */ |
| 270 | public void setEchoChar(char c) { |
| 271 | setEchoCharacter(c); |
| 272 | } |
| 273 | |
| 274 | /** |
| 275 | * @deprecated As of JDK version 1.1, |
| 276 | * replaced by <code>setEchoChar(char)</code>. |
| 277 | */ |
| 278 | @Deprecated |
| 279 | public synchronized void setEchoCharacter(char c) { |
| 280 | if (echoChar != c) { |
| 281 | echoChar = c; |
| 282 | TextFieldPeer peer = (TextFieldPeer)this.peer; |
| 283 | if (peer != null) { |
| 284 | peer.setEchoCharacter(c); |
| 285 | } |
| 286 | } |
| 287 | } |
| 288 | |
| 289 | /** |
| 290 | * Sets the text that is presented by this |
| 291 | * text component to be the specified text. |
| 292 | * @param t the new text. |
| 293 | * @see java.awt.TextComponent#getText |
| 294 | */ |
| 295 | public void setText(String t) { |
| 296 | super.setText(t); |
| 297 | |
| 298 | // This could change the preferred size of the Component. |
| 299 | if (valid) { |
| 300 | invalidate(); |
| 301 | } |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Indicates whether or not this text field has a |
| 306 | * character set for echoing. |
| 307 | * <p> |
| 308 | * An echo character is useful for text fields where |
| 309 | * user input should not be echoed to the screen, as in |
| 310 | * the case of a text field for entering a password. |
| 311 | * @return <code>true</code> if this text field has |
| 312 | * a character set for echoing; |
| 313 | * <code>false</code> otherwise. |
| 314 | * @see java.awt.TextField#setEchoChar |
| 315 | * @see java.awt.TextField#getEchoChar |
| 316 | */ |
| 317 | public boolean echoCharIsSet() { |
| 318 | return echoChar != 0; |
| 319 | } |
| 320 | |
| 321 | /** |
| 322 | * Gets the number of columns in this text field. A column is an |
| 323 | * approximate average character width that is platform-dependent. |
| 324 | * @return the number of columns. |
| 325 | * @see java.awt.TextField#setColumns |
| 326 | * @since JDK1.1 |
| 327 | */ |
| 328 | public int getColumns() { |
| 329 | return columns; |
| 330 | } |
| 331 | |
| 332 | /** |
| 333 | * Sets the number of columns in this text field. A column is an |
| 334 | * approximate average character width that is platform-dependent. |
| 335 | * @param columns the number of columns. |
| 336 | * @see java.awt.TextField#getColumns |
| 337 | * @exception IllegalArgumentException if the value |
| 338 | * supplied for <code>columns</code> |
| 339 | * is less than <code>0</code>. |
| 340 | * @since JDK1.1 |
| 341 | */ |
| 342 | public void setColumns(int columns) { |
| 343 | int oldVal; |
| 344 | synchronized (this) { |
| 345 | oldVal = this.columns; |
| 346 | if (columns < 0) { |
| 347 | throw new IllegalArgumentException("columns less than zero."); |
| 348 | } |
| 349 | if (columns != oldVal) { |
| 350 | this.columns = columns; |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | if (columns != oldVal) { |
| 355 | invalidate(); |
| 356 | } |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * Gets the preferred size of this text field |
| 361 | * with the specified number of columns. |
| 362 | * @param columns the number of columns |
| 363 | * in this text field. |
| 364 | * @return the preferred dimensions for |
| 365 | * displaying this text field. |
| 366 | * @since JDK1.1 |
| 367 | */ |
| 368 | public Dimension getPreferredSize(int columns) { |
| 369 | return preferredSize(columns); |
| 370 | } |
| 371 | |
| 372 | /** |
| 373 | * @deprecated As of JDK version 1.1, |
| 374 | * replaced by <code>getPreferredSize(int)</code>. |
| 375 | */ |
| 376 | @Deprecated |
| 377 | public Dimension preferredSize(int columns) { |
| 378 | synchronized (getTreeLock()) { |
| 379 | TextFieldPeer peer = (TextFieldPeer)this.peer; |
| 380 | return (peer != null) ? |
| 381 | peer.preferredSize(columns) : |
| 382 | super.preferredSize(); |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | /** |
| 387 | * Gets the preferred size of this text field. |
| 388 | * @return the preferred dimensions for |
| 389 | * displaying this text field. |
| 390 | * @since JDK1.1 |
| 391 | */ |
| 392 | public Dimension getPreferredSize() { |
| 393 | return preferredSize(); |
| 394 | } |
| 395 | |
| 396 | /** |
| 397 | * @deprecated As of JDK version 1.1, |
| 398 | * replaced by <code>getPreferredSize()</code>. |
| 399 | */ |
| 400 | @Deprecated |
| 401 | public Dimension preferredSize() { |
| 402 | synchronized (getTreeLock()) { |
| 403 | return (columns > 0) ? |
| 404 | preferredSize(columns) : |
| 405 | super.preferredSize(); |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | /** |
| 410 | * Gets the minumum dimensions for a text field with |
| 411 | * the specified number of columns. |
| 412 | * @param columns the number of columns in |
| 413 | * this text field. |
| 414 | * @since JDK1.1 |
| 415 | */ |
| 416 | public Dimension getMinimumSize(int columns) { |
| 417 | return minimumSize(columns); |
| 418 | } |
| 419 | |
| 420 | /** |
| 421 | * @deprecated As of JDK version 1.1, |
| 422 | * replaced by <code>getMinimumSize(int)</code>. |
| 423 | */ |
| 424 | @Deprecated |
| 425 | public Dimension minimumSize(int columns) { |
| 426 | synchronized (getTreeLock()) { |
| 427 | TextFieldPeer peer = (TextFieldPeer)this.peer; |
| 428 | return (peer != null) ? |
| 429 | peer.minimumSize(columns) : |
| 430 | super.minimumSize(); |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * Gets the minumum dimensions for this text field. |
| 436 | * @return the minimum dimensions for |
| 437 | * displaying this text field. |
| 438 | * @since JDK1.1 |
| 439 | */ |
| 440 | public Dimension getMinimumSize() { |
| 441 | return minimumSize(); |
| 442 | } |
| 443 | |
| 444 | /** |
| 445 | * @deprecated As of JDK version 1.1, |
| 446 | * replaced by <code>getMinimumSize()</code>. |
| 447 | */ |
| 448 | @Deprecated |
| 449 | public Dimension minimumSize() { |
| 450 | synchronized (getTreeLock()) { |
| 451 | return (columns > 0) ? |
| 452 | minimumSize(columns) : |
| 453 | super.minimumSize(); |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | /** |
| 458 | * Adds the specified action listener to receive |
| 459 | * action events from this text field. |
| 460 | * If l is null, no exception is thrown and no action is performed. |
| 461 | * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" |
| 462 | * >AWT Threading Issues</a> for details on AWT's threading model. |
| 463 | * |
| 464 | * @param l the action listener. |
| 465 | * @see #removeActionListener |
| 466 | * @see #getActionListeners |
| 467 | * @see java.awt.event.ActionListener |
| 468 | * @since JDK1.1 |
| 469 | */ |
| 470 | public synchronized void addActionListener(ActionListener l) { |
| 471 | if (l == null) { |
| 472 | return; |
| 473 | } |
| 474 | actionListener = AWTEventMulticaster.add(actionListener, l); |
| 475 | newEventsOnly = true; |
| 476 | } |
| 477 | |
| 478 | /** |
| 479 | * Removes the specified action listener so that it no longer |
| 480 | * receives action events from this text field. |
| 481 | * If l is null, no exception is thrown and no action is performed. |
| 482 | * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads" |
| 483 | * >AWT Threading Issues</a> for details on AWT's threading model. |
| 484 | * |
| 485 | * @param l the action listener. |
| 486 | * @see #addActionListener |
| 487 | * @see #getActionListeners |
| 488 | * @see java.awt.event.ActionListener |
| 489 | * @since JDK1.1 |
| 490 | */ |
| 491 | public synchronized void removeActionListener(ActionListener l) { |
| 492 | if (l == null) { |
| 493 | return; |
| 494 | } |
| 495 | actionListener = AWTEventMulticaster.remove(actionListener, l); |
| 496 | } |
| 497 | |
| 498 | /** |
| 499 | * Returns an array of all the action listeners |
| 500 | * registered on this textfield. |
| 501 | * |
| 502 | * @return all of this textfield's <code>ActionListener</code>s |
| 503 | * or an empty array if no action |
| 504 | * listeners are currently registered |
| 505 | * |
| 506 | * @see #addActionListener |
| 507 | * @see #removeActionListener |
| 508 | * @see java.awt.event#ActionListener |
| 509 | * @since 1.4 |
| 510 | */ |
| 511 | public synchronized ActionListener[] getActionListeners() { |
| 512 | return (ActionListener[])(getListeners(ActionListener.class)); |
| 513 | } |
| 514 | |
| 515 | /** |
| 516 | * Returns an array of all the objects currently registered |
| 517 | * as <code><em>Foo</em>Listener</code>s |
| 518 | * upon this <code>TextField</code>. |
| 519 | * <code><em>Foo</em>Listener</code>s are registered using the |
| 520 | * <code>add<em>Foo</em>Listener</code> method. |
| 521 | * |
| 522 | * <p> |
| 523 | * You can specify the <code>listenerType</code> argument |
| 524 | * with a class literal, such as |
| 525 | * <code><em>Foo</em>Listener.class</code>. |
| 526 | * For example, you can query a |
| 527 | * <code>TextField</code> <code>t</code> |
| 528 | * for its action listeners with the following code: |
| 529 | * |
| 530 | * <pre>ActionListener[] als = (ActionListener[])(t.getListeners(ActionListener.class));</pre> |
| 531 | * |
| 532 | * If no such listeners exist, this method returns an empty array. |
| 533 | * |
| 534 | * @param listenerType the type of listeners requested; this parameter |
| 535 | * should specify an interface that descends from |
| 536 | * <code>java.util.EventListener</code> |
| 537 | * @return an array of all objects registered as |
| 538 | * <code><em>Foo</em>Listener</code>s on this textfield, |
| 539 | * or an empty array if no such |
| 540 | * listeners have been added |
| 541 | * @exception ClassCastException if <code>listenerType</code> |
| 542 | * doesn't specify a class or interface that implements |
| 543 | * <code>java.util.EventListener</code> |
| 544 | * |
| 545 | * @see #getActionListeners |
| 546 | * @since 1.3 |
| 547 | */ |
| 548 | public <T extends EventListener> T[] getListeners(Class<T> listenerType) { |
| 549 | EventListener l = null; |
| 550 | if (listenerType == ActionListener.class) { |
| 551 | l = actionListener; |
| 552 | } else { |
| 553 | return super.getListeners(listenerType); |
| 554 | } |
| 555 | return AWTEventMulticaster.getListeners(l, listenerType); |
| 556 | } |
| 557 | |
| 558 | // REMIND: remove when filtering is done at lower level |
| 559 | boolean eventEnabled(AWTEvent e) { |
| 560 | if (e.id == ActionEvent.ACTION_PERFORMED) { |
| 561 | if ((eventMask & AWTEvent.ACTION_EVENT_MASK) != 0 || |
| 562 | actionListener != null) { |
| 563 | return true; |
| 564 | } |
| 565 | return false; |
| 566 | } |
| 567 | return super.eventEnabled(e); |
| 568 | } |
| 569 | |
| 570 | /** |
| 571 | * Processes events on this text field. If the event |
| 572 | * is an instance of <code>ActionEvent</code>, |
| 573 | * it invokes the <code>processActionEvent</code> |
| 574 | * method. Otherwise, it invokes <code>processEvent</code> |
| 575 | * on the superclass. |
| 576 | * <p>Note that if the event parameter is <code>null</code> |
| 577 | * the behavior is unspecified and may result in an |
| 578 | * exception. |
| 579 | * |
| 580 | * @param e the event |
| 581 | * @see java.awt.event.ActionEvent |
| 582 | * @see java.awt.TextField#processActionEvent |
| 583 | * @since JDK1.1 |
| 584 | */ |
| 585 | protected void processEvent(AWTEvent e) { |
| 586 | if (e instanceof ActionEvent) { |
| 587 | processActionEvent((ActionEvent)e); |
| 588 | return; |
| 589 | } |
| 590 | super.processEvent(e); |
| 591 | } |
| 592 | |
| 593 | /** |
| 594 | * Processes action events occurring on this text field by |
| 595 | * dispatching them to any registered |
| 596 | * <code>ActionListener</code> objects. |
| 597 | * <p> |
| 598 | * This method is not called unless action events are |
| 599 | * enabled for this component. Action events are enabled |
| 600 | * when one of the following occurs: |
| 601 | * <p><ul> |
| 602 | * <li>An <code>ActionListener</code> object is registered |
| 603 | * via <code>addActionListener</code>. |
| 604 | * <li>Action events are enabled via <code>enableEvents</code>. |
| 605 | * </ul> |
| 606 | * <p>Note that if the event parameter is <code>null</code> |
| 607 | * the behavior is unspecified and may result in an |
| 608 | * exception. |
| 609 | * |
| 610 | * @param e the action event |
| 611 | * @see java.awt.event.ActionListener |
| 612 | * @see java.awt.TextField#addActionListener |
| 613 | * @see java.awt.Component#enableEvents |
| 614 | * @since JDK1.1 |
| 615 | */ |
| 616 | protected void processActionEvent(ActionEvent e) { |
| 617 | ActionListener listener = actionListener; |
| 618 | if (listener != null) { |
| 619 | listener.actionPerformed(e); |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | /** |
| 624 | * Returns a string representing the state of this <code>TextField</code>. |
| 625 | * This method is intended to be used only for debugging purposes, and the |
| 626 | * content and format of the returned string may vary between |
| 627 | * implementations. The returned string may be empty but may not be |
| 628 | * <code>null</code>. |
| 629 | * |
| 630 | * @return the parameter string of this text field |
| 631 | */ |
| 632 | protected String paramString() { |
| 633 | String str = super.paramString(); |
| 634 | if (echoChar != 0) { |
| 635 | str += ",echo=" + echoChar; |
| 636 | } |
| 637 | return str; |
| 638 | } |
| 639 | |
| 640 | |
| 641 | /* |
| 642 | * Serialization support. |
| 643 | */ |
| 644 | /** |
| 645 | * The textField Serialized Data Version. |
| 646 | * |
| 647 | * @serial |
| 648 | */ |
| 649 | private int textFieldSerializedDataVersion = 1; |
| 650 | |
| 651 | /** |
| 652 | * Writes default serializable fields to stream. Writes |
| 653 | * a list of serializable ActionListener(s) as optional data. |
| 654 | * The non-serializable ActionListener(s) are detected and |
| 655 | * no attempt is made to serialize them. |
| 656 | * |
| 657 | * @serialData Null terminated sequence of zero or more pairs. |
| 658 | * A pair consists of a String and Object. |
| 659 | * The String indicates the type of object and |
| 660 | * is one of the following : |
| 661 | * ActionListenerK indicating and ActionListener object. |
| 662 | * |
| 663 | * @see AWTEventMulticaster#save(ObjectOutputStream, String, EventListener) |
| 664 | * @see java.awt.Component#actionListenerK |
| 665 | */ |
| 666 | private void writeObject(ObjectOutputStream s) |
| 667 | throws IOException |
| 668 | { |
| 669 | s.defaultWriteObject(); |
| 670 | |
| 671 | AWTEventMulticaster.save(s, actionListenerK, actionListener); |
| 672 | s.writeObject(null); |
| 673 | } |
| 674 | |
| 675 | /** |
| 676 | * Read the ObjectInputStream and if it isn't null, |
| 677 | * add a listener to receive action events fired by the |
| 678 | * TextField. Unrecognized keys or values will be |
| 679 | * ignored. |
| 680 | * |
| 681 | * @exception HeadlessException if |
| 682 | * <code>GraphicsEnvironment.isHeadless()</code> returns |
| 683 | * <code>true</code> |
| 684 | * @see #removeActionListener(ActionListener) |
| 685 | * @see #addActionListener(ActionListener) |
| 686 | * @see java.awt.GraphicsEnvironment#isHeadless |
| 687 | */ |
| 688 | private void readObject(ObjectInputStream s) |
| 689 | throws ClassNotFoundException, IOException, HeadlessException |
| 690 | { |
| 691 | // HeadlessException will be thrown by TextComponent's readObject |
| 692 | s.defaultReadObject(); |
| 693 | |
| 694 | // Make sure the state we just read in for columns has legal values |
| 695 | if (columns < 0) { |
| 696 | columns = 0; |
| 697 | } |
| 698 | |
| 699 | // Read in listeners, if any |
| 700 | Object keyOrNull; |
| 701 | while(null != (keyOrNull = s.readObject())) { |
| 702 | String key = ((String)keyOrNull).intern(); |
| 703 | |
| 704 | if (actionListenerK == key) { |
| 705 | addActionListener((ActionListener)(s.readObject())); |
| 706 | } else { |
| 707 | // skip value for unrecognized key |
| 708 | s.readObject(); |
| 709 | } |
| 710 | } |
| 711 | } |
| 712 | |
| 713 | |
| 714 | ///////////////// |
| 715 | // Accessibility support |
| 716 | //////////////// |
| 717 | |
| 718 | |
| 719 | /** |
| 720 | * Gets the AccessibleContext associated with this TextField. |
| 721 | * For text fields, the AccessibleContext takes the form of an |
| 722 | * AccessibleAWTTextField. |
| 723 | * A new AccessibleAWTTextField instance is created if necessary. |
| 724 | * |
| 725 | * @return an AccessibleAWTTextField that serves as the |
| 726 | * AccessibleContext of this TextField |
| 727 | * @since 1.3 |
| 728 | */ |
| 729 | public AccessibleContext getAccessibleContext() { |
| 730 | if (accessibleContext == null) { |
| 731 | accessibleContext = new AccessibleAWTTextField(); |
| 732 | } |
| 733 | return accessibleContext; |
| 734 | } |
| 735 | |
| 736 | /** |
| 737 | * This class implements accessibility support for the |
| 738 | * <code>TextField</code> class. It provides an implementation of the |
| 739 | * Java Accessibility API appropriate to text field user-interface elements. |
| 740 | * @since 1.3 |
| 741 | */ |
| 742 | protected class AccessibleAWTTextField extends AccessibleAWTTextComponent |
| 743 | { |
| 744 | /* |
| 745 | * JDK 1.3 serialVersionUID |
| 746 | */ |
| 747 | private static final long serialVersionUID = 6219164359235943158L; |
| 748 | |
| 749 | /** |
| 750 | * Gets the state set of this object. |
| 751 | * |
| 752 | * @return an instance of AccessibleStateSet describing the states |
| 753 | * of the object |
| 754 | * @see AccessibleState |
| 755 | */ |
| 756 | public AccessibleStateSet getAccessibleStateSet() { |
| 757 | AccessibleStateSet states = super.getAccessibleStateSet(); |
| 758 | states.add(AccessibleState.SINGLE_LINE); |
| 759 | return states; |
| 760 | } |
| 761 | } |
| 762 | |
| 763 | } |