J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | package javax.swing; |
| 26 | |
| 27 | import java.awt.*; |
| 28 | import java.awt.event.*; |
| 29 | import java.beans.*; |
| 30 | import javax.swing.text.*; |
| 31 | import javax.swing.plaf.*; |
| 32 | import javax.swing.event.*; |
| 33 | import javax.accessibility.*; |
| 34 | |
| 35 | import java.io.ObjectOutputStream; |
| 36 | import java.io.ObjectInputStream; |
| 37 | import java.io.IOException; |
| 38 | import java.io.Serializable; |
| 39 | |
| 40 | /** |
| 41 | * <code>JTextField</code> is a lightweight component that allows the editing |
| 42 | * of a single line of text. |
| 43 | * For information on and examples of using text fields, |
| 44 | * see |
| 45 | * <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/textfield.html">How to Use Text Fields</a> |
| 46 | * in <em>The Java Tutorial.</em> |
| 47 | * |
| 48 | * <p> |
| 49 | * <code>JTextField</code> is intended to be source-compatible |
| 50 | * with <code>java.awt.TextField</code> where it is reasonable to do so. This |
| 51 | * component has capabilities not found in the <code>java.awt.TextField</code> |
| 52 | * class. The superclass should be consulted for additional capabilities. |
| 53 | * <p> |
| 54 | * <code>JTextField</code> has a method to establish the string used as the |
| 55 | * command string for the action event that gets fired. The |
| 56 | * <code>java.awt.TextField</code> used the text of the field as the command |
| 57 | * string for the <code>ActionEvent</code>. |
| 58 | * <code>JTextField</code> will use the command |
| 59 | * string set with the <code>setActionCommand</code> method if not <code>null</code>, |
| 60 | * otherwise it will use the text of the field as a compatibility with |
| 61 | * <code>java.awt.TextField</code>. |
| 62 | * <p> |
| 63 | * The method <code>setEchoChar</code> and <code>getEchoChar</code> |
| 64 | * are not provided directly to avoid a new implementation of a |
| 65 | * pluggable look-and-feel inadvertently exposing password characters. |
| 66 | * To provide password-like services a separate class <code>JPasswordField</code> |
| 67 | * extends <code>JTextField</code> to provide this service with an independently |
| 68 | * pluggable look-and-feel. |
| 69 | * <p> |
| 70 | * The <code>java.awt.TextField</code> could be monitored for changes by adding |
| 71 | * a <code>TextListener</code> for <code>TextEvent</code>'s. |
| 72 | * In the <code>JTextComponent</code> based |
| 73 | * components, changes are broadcasted from the model via a |
| 74 | * <code>DocumentEvent</code> to <code>DocumentListeners</code>. |
| 75 | * The <code>DocumentEvent</code> gives |
| 76 | * the location of the change and the kind of change if desired. |
| 77 | * The code fragment might look something like: |
| 78 | * <pre><code> |
| 79 | * DocumentListener myListener = ??; |
| 80 | * JTextField myArea = ??; |
| 81 | * myArea.getDocument().addDocumentListener(myListener); |
| 82 | * </code></pre> |
| 83 | * <p> |
| 84 | * The horizontal alignment of <code>JTextField</code> can be set to be left |
| 85 | * justified, leading justified, centered, right justified or trailing justified. |
| 86 | * Right/trailing justification is useful if the required size |
| 87 | * of the field text is smaller than the size allocated to it. |
| 88 | * This is determined by the <code>setHorizontalAlignment</code> |
| 89 | * and <code>getHorizontalAlignment</code> methods. The default |
| 90 | * is to be leading justified. |
| 91 | * <p> |
| 92 | * How the text field consumes VK_ENTER events depends |
| 93 | * on whether the text field has any action listeners. |
| 94 | * If so, then VK_ENTER results in the listeners |
| 95 | * getting an ActionEvent, |
| 96 | * and the VK_ENTER event is consumed. |
| 97 | * This is compatible with how AWT text fields handle VK_ENTER events. |
| 98 | * If the text field has no action listeners, then as of v 1.3 the VK_ENTER |
| 99 | * event is not consumed. Instead, the bindings of ancestor components |
| 100 | * are processed, which enables the default button feature of |
| 101 | * JFC/Swing to work. |
| 102 | * <p> |
| 103 | * Customized fields can easily be created by extending the model and |
| 104 | * changing the default model provided. For example, the following piece |
| 105 | * of code will create a field that holds only upper case characters. It |
| 106 | * will work even if text is pasted into from the clipboard or it is altered via |
| 107 | * programmatic changes. |
| 108 | * <pre><code> |
| 109 | |
| 110 | public class UpperCaseField extends JTextField { |
| 111 | |
| 112 | public UpperCaseField(int cols) { |
| 113 | super(cols); |
| 114 | } |
| 115 | |
| 116 | protected Document createDefaultModel() { |
| 117 | return new UpperCaseDocument(); |
| 118 | } |
| 119 | |
| 120 | static class UpperCaseDocument extends PlainDocument { |
| 121 | |
| 122 | public void insertString(int offs, String str, AttributeSet a) |
| 123 | throws BadLocationException { |
| 124 | |
| 125 | if (str == null) { |
| 126 | return; |
| 127 | } |
| 128 | char[] upper = str.toCharArray(); |
| 129 | for (int i = 0; i < upper.length; i++) { |
| 130 | upper[i] = Character.toUpperCase(upper[i]); |
| 131 | } |
| 132 | super.insertString(offs, new String(upper), a); |
| 133 | } |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | * </code></pre> |
| 138 | * <p> |
| 139 | * <strong>Warning:</strong> Swing is not thread safe. For more |
| 140 | * information see <a |
| 141 | * href="package-summary.html#threading">Swing's Threading |
| 142 | * Policy</a>. |
| 143 | * <p> |
| 144 | * <strong>Warning:</strong> |
| 145 | * Serialized objects of this class will not be compatible with |
| 146 | * future Swing releases. The current serialization support is |
| 147 | * appropriate for short term storage or RMI between applications running |
| 148 | * the same version of Swing. As of 1.4, support for long term storage |
| 149 | * of all JavaBeans<sup><font size="-2">TM</font></sup> |
| 150 | * has been added to the <code>java.beans</code> package. |
| 151 | * Please see {@link java.beans.XMLEncoder}. |
| 152 | * |
| 153 | * @beaninfo |
| 154 | * attribute: isContainer false |
| 155 | * description: A component which allows for the editing of a single line of text. |
| 156 | * |
| 157 | * @author Timothy Prinzing |
| 158 | * @see #setActionCommand |
| 159 | * @see JPasswordField |
| 160 | * @see #addActionListener |
| 161 | */ |
| 162 | public class JTextField extends JTextComponent implements SwingConstants { |
| 163 | |
| 164 | /** |
| 165 | * Constructs a new <code>TextField</code>. A default model is created, |
| 166 | * the initial string is <code>null</code>, |
| 167 | * and the number of columns is set to 0. |
| 168 | */ |
| 169 | public JTextField() { |
| 170 | this(null, null, 0); |
| 171 | } |
| 172 | |
| 173 | /** |
| 174 | * Constructs a new <code>TextField</code> initialized with the |
| 175 | * specified text. A default model is created and the number of |
| 176 | * columns is 0. |
| 177 | * |
| 178 | * @param text the text to be displayed, or <code>null</code> |
| 179 | */ |
| 180 | public JTextField(String text) { |
| 181 | this(null, text, 0); |
| 182 | } |
| 183 | |
| 184 | /** |
| 185 | * Constructs a new empty <code>TextField</code> with the specified |
| 186 | * number of columns. |
| 187 | * A default model is created and the initial string is set to |
| 188 | * <code>null</code>. |
| 189 | * |
| 190 | * @param columns the number of columns to use to calculate |
| 191 | * the preferred width; if columns is set to zero, the |
| 192 | * preferred width will be whatever naturally results from |
| 193 | * the component implementation |
| 194 | */ |
| 195 | public JTextField(int columns) { |
| 196 | this(null, null, columns); |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * Constructs a new <code>TextField</code> initialized with the |
| 201 | * specified text and columns. A default model is created. |
| 202 | * |
| 203 | * @param text the text to be displayed, or <code>null</code> |
| 204 | * @param columns the number of columns to use to calculate |
| 205 | * the preferred width; if columns is set to zero, the |
| 206 | * preferred width will be whatever naturally results from |
| 207 | * the component implementation |
| 208 | */ |
| 209 | public JTextField(String text, int columns) { |
| 210 | this(null, text, columns); |
| 211 | } |
| 212 | |
| 213 | /** |
| 214 | * Constructs a new <code>JTextField</code> that uses the given text |
| 215 | * storage model and the given number of columns. |
| 216 | * This is the constructor through which the other constructors feed. |
| 217 | * If the document is <code>null</code>, a default model is created. |
| 218 | * |
| 219 | * @param doc the text storage to use; if this is <code>null</code>, |
| 220 | * a default will be provided by calling the |
| 221 | * <code>createDefaultModel</code> method |
| 222 | * @param text the initial string to display, or <code>null</code> |
| 223 | * @param columns the number of columns to use to calculate |
| 224 | * the preferred width >= 0; if <code>columns</code> |
| 225 | * is set to zero, the preferred width will be whatever |
| 226 | * naturally results from the component implementation |
| 227 | * @exception IllegalArgumentException if <code>columns</code> < 0 |
| 228 | */ |
| 229 | public JTextField(Document doc, String text, int columns) { |
| 230 | if (columns < 0) { |
| 231 | throw new IllegalArgumentException("columns less than zero."); |
| 232 | } |
| 233 | visibility = new DefaultBoundedRangeModel(); |
| 234 | visibility.addChangeListener(new ScrollRepainter()); |
| 235 | this.columns = columns; |
| 236 | if (doc == null) { |
| 237 | doc = createDefaultModel(); |
| 238 | } |
| 239 | setDocument(doc); |
| 240 | if (text != null) { |
| 241 | setText(text); |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | /** |
| 246 | * Gets the class ID for a UI. |
| 247 | * |
| 248 | * @return the string "TextFieldUI" |
| 249 | * @see JComponent#getUIClassID |
| 250 | * @see UIDefaults#getUI |
| 251 | */ |
| 252 | public String getUIClassID() { |
| 253 | return uiClassID; |
| 254 | } |
| 255 | |
| 256 | |
| 257 | /** |
| 258 | * Associates the editor with a text document. |
| 259 | * The currently registered factory is used to build a view for |
| 260 | * the document, which gets displayed by the editor after revalidation. |
| 261 | * A PropertyChange event ("document") is propagated to each listener. |
| 262 | * |
| 263 | * @param doc the document to display/edit |
| 264 | * @see #getDocument |
| 265 | * @beaninfo |
| 266 | * description: the text document model |
| 267 | * bound: true |
| 268 | * expert: true |
| 269 | */ |
| 270 | public void setDocument(Document doc) { |
| 271 | if (doc != null) { |
| 272 | doc.putProperty("filterNewlines", Boolean.TRUE); |
| 273 | } |
| 274 | super.setDocument(doc); |
| 275 | } |
| 276 | |
| 277 | /** |
| 278 | * Calls to <code>revalidate</code> that come from within the |
| 279 | * textfield itself will |
| 280 | * be handled by validating the textfield, unless the textfield |
| 281 | * is contained within a <code>JViewport</code>, |
| 282 | * in which case this returns false. |
| 283 | * |
| 284 | * @return if the parent of this textfield is a <code>JViewPort</code> |
| 285 | * return false, otherwise return true |
| 286 | * |
| 287 | * @see JComponent#revalidate |
| 288 | * @see JComponent#isValidateRoot |
| 289 | */ |
| 290 | public boolean isValidateRoot() { |
| 291 | Component parent = getParent(); |
| 292 | if (parent instanceof JViewport) { |
| 293 | return false; |
| 294 | } |
| 295 | return true; |
| 296 | } |
| 297 | |
| 298 | |
| 299 | /** |
| 300 | * Returns the horizontal alignment of the text. |
| 301 | * Valid keys are: |
| 302 | * <ul> |
| 303 | * <li><code>JTextField.LEFT</code> |
| 304 | * <li><code>JTextField.CENTER</code> |
| 305 | * <li><code>JTextField.RIGHT</code> |
| 306 | * <li><code>JTextField.LEADING</code> |
| 307 | * <li><code>JTextField.TRAILING</code> |
| 308 | * </ul> |
| 309 | * |
| 310 | * @return the horizontal alignment |
| 311 | */ |
| 312 | public int getHorizontalAlignment() { |
| 313 | return horizontalAlignment; |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Sets the horizontal alignment of the text. |
| 318 | * Valid keys are: |
| 319 | * <ul> |
| 320 | * <li><code>JTextField.LEFT</code> |
| 321 | * <li><code>JTextField.CENTER</code> |
| 322 | * <li><code>JTextField.RIGHT</code> |
| 323 | * <li><code>JTextField.LEADING</code> |
| 324 | * <li><code>JTextField.TRAILING</code> |
| 325 | * </ul> |
| 326 | * <code>invalidate</code> and <code>repaint</code> are called when the |
| 327 | * alignment is set, |
| 328 | * and a <code>PropertyChange</code> event ("horizontalAlignment") is fired. |
| 329 | * |
| 330 | * @param alignment the alignment |
| 331 | * @exception IllegalArgumentException if <code>alignment</code> |
| 332 | * is not a valid key |
| 333 | * @beaninfo |
| 334 | * preferred: true |
| 335 | * bound: true |
| 336 | * description: Set the field alignment to LEFT, CENTER, RIGHT, |
| 337 | * LEADING (the default) or TRAILING |
| 338 | * enum: LEFT JTextField.LEFT CENTER JTextField.CENTER RIGHT JTextField.RIGHT |
| 339 | * LEADING JTextField.LEADING TRAILING JTextField.TRAILING |
| 340 | */ |
| 341 | public void setHorizontalAlignment(int alignment) { |
| 342 | if (alignment == horizontalAlignment) return; |
| 343 | int oldValue = horizontalAlignment; |
| 344 | if ((alignment == LEFT) || (alignment == CENTER) || |
| 345 | (alignment == RIGHT)|| (alignment == LEADING) || |
| 346 | (alignment == TRAILING)) { |
| 347 | horizontalAlignment = alignment; |
| 348 | } else { |
| 349 | throw new IllegalArgumentException("horizontalAlignment"); |
| 350 | } |
| 351 | firePropertyChange("horizontalAlignment", oldValue, horizontalAlignment); |
| 352 | invalidate(); |
| 353 | repaint(); |
| 354 | } |
| 355 | |
| 356 | /** |
| 357 | * Creates the default implementation of the model |
| 358 | * to be used at construction if one isn't explicitly |
| 359 | * given. An instance of <code>PlainDocument</code> is returned. |
| 360 | * |
| 361 | * @return the default model implementation |
| 362 | */ |
| 363 | protected Document createDefaultModel() { |
| 364 | return new PlainDocument(); |
| 365 | } |
| 366 | |
| 367 | /** |
| 368 | * Returns the number of columns in this <code>TextField</code>. |
| 369 | * |
| 370 | * @return the number of columns >= 0 |
| 371 | */ |
| 372 | public int getColumns() { |
| 373 | return columns; |
| 374 | } |
| 375 | |
| 376 | /** |
| 377 | * Sets the number of columns in this <code>TextField</code>, |
| 378 | * and then invalidate the layout. |
| 379 | * |
| 380 | * @param columns the number of columns >= 0 |
| 381 | * @exception IllegalArgumentException if <code>columns</code> |
| 382 | * is less than 0 |
| 383 | * @beaninfo |
| 384 | * description: the number of columns preferred for display |
| 385 | */ |
| 386 | public void setColumns(int columns) { |
| 387 | int oldVal = this.columns; |
| 388 | if (columns < 0) { |
| 389 | throw new IllegalArgumentException("columns less than zero."); |
| 390 | } |
| 391 | if (columns != oldVal) { |
| 392 | this.columns = columns; |
| 393 | invalidate(); |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | /** |
| 398 | * Returns the column width. |
| 399 | * The meaning of what a column is can be considered a fairly weak |
| 400 | * notion for some fonts. This method is used to define the width |
| 401 | * of a column. By default this is defined to be the width of the |
| 402 | * character <em>m</em> for the font used. This method can be |
| 403 | * redefined to be some alternative amount |
| 404 | * |
| 405 | * @return the column width >= 1 |
| 406 | */ |
| 407 | protected int getColumnWidth() { |
| 408 | if (columnWidth == 0) { |
| 409 | FontMetrics metrics = getFontMetrics(getFont()); |
| 410 | columnWidth = metrics.charWidth('m'); |
| 411 | } |
| 412 | return columnWidth; |
| 413 | } |
| 414 | |
| 415 | /** |
| 416 | * Returns the preferred size <code>Dimensions</code> needed for this |
| 417 | * <code>TextField</code>. If a non-zero number of columns has been |
| 418 | * set, the width is set to the columns multiplied by |
| 419 | * the column width. |
| 420 | * |
| 421 | * @return the dimension of this textfield |
| 422 | */ |
| 423 | public Dimension getPreferredSize() { |
| 424 | Dimension size = super.getPreferredSize(); |
| 425 | if (columns != 0) { |
| 426 | Insets insets = getInsets(); |
| 427 | size.width = columns * getColumnWidth() + |
| 428 | insets.left + insets.right; |
| 429 | } |
| 430 | return size; |
| 431 | } |
| 432 | |
| 433 | /** |
| 434 | * Sets the current font. This removes cached row height and column |
| 435 | * width so the new font will be reflected. |
| 436 | * <code>revalidate</code> is called after setting the font. |
| 437 | * |
| 438 | * @param f the new font |
| 439 | */ |
| 440 | public void setFont(Font f) { |
| 441 | super.setFont(f); |
| 442 | columnWidth = 0; |
| 443 | } |
| 444 | |
| 445 | /** |
| 446 | * Adds the specified action listener to receive |
| 447 | * action events from this textfield. |
| 448 | * |
| 449 | * @param l the action listener to be added |
| 450 | */ |
| 451 | public synchronized void addActionListener(ActionListener l) { |
| 452 | listenerList.add(ActionListener.class, l); |
| 453 | } |
| 454 | |
| 455 | /** |
| 456 | * Removes the specified action listener so that it no longer |
| 457 | * receives action events from this textfield. |
| 458 | * |
| 459 | * @param l the action listener to be removed |
| 460 | */ |
| 461 | public synchronized void removeActionListener(ActionListener l) { |
| 462 | if ((l != null) && (getAction() == l)) { |
| 463 | setAction(null); |
| 464 | } else { |
| 465 | listenerList.remove(ActionListener.class, l); |
| 466 | } |
| 467 | } |
| 468 | |
| 469 | /** |
| 470 | * Returns an array of all the <code>ActionListener</code>s added |
| 471 | * to this JTextField with addActionListener(). |
| 472 | * |
| 473 | * @return all of the <code>ActionListener</code>s added or an empty |
| 474 | * array if no listeners have been added |
| 475 | * @since 1.4 |
| 476 | */ |
| 477 | public synchronized ActionListener[] getActionListeners() { |
| 478 | return (ActionListener[])listenerList.getListeners( |
| 479 | ActionListener.class); |
| 480 | } |
| 481 | |
| 482 | /** |
| 483 | * Notifies all listeners that have registered interest for |
| 484 | * notification on this event type. The event instance |
| 485 | * is lazily created. |
| 486 | * The listener list is processed in last to |
| 487 | * first order. |
| 488 | * @see EventListenerList |
| 489 | */ |
| 490 | protected void fireActionPerformed() { |
| 491 | // Guaranteed to return a non-null array |
| 492 | Object[] listeners = listenerList.getListenerList(); |
| 493 | int modifiers = 0; |
| 494 | AWTEvent currentEvent = EventQueue.getCurrentEvent(); |
| 495 | if (currentEvent instanceof InputEvent) { |
| 496 | modifiers = ((InputEvent)currentEvent).getModifiers(); |
| 497 | } else if (currentEvent instanceof ActionEvent) { |
| 498 | modifiers = ((ActionEvent)currentEvent).getModifiers(); |
| 499 | } |
| 500 | ActionEvent e = |
| 501 | new ActionEvent(this, ActionEvent.ACTION_PERFORMED, |
| 502 | (command != null) ? command : getText(), |
| 503 | EventQueue.getMostRecentEventTime(), modifiers); |
| 504 | |
| 505 | // Process the listeners last to first, notifying |
| 506 | // those that are interested in this event |
| 507 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 508 | if (listeners[i]==ActionListener.class) { |
| 509 | ((ActionListener)listeners[i+1]).actionPerformed(e); |
| 510 | } |
| 511 | } |
| 512 | } |
| 513 | |
| 514 | /** |
| 515 | * Sets the command string used for action events. |
| 516 | * |
| 517 | * @param command the command string |
| 518 | */ |
| 519 | public void setActionCommand(String command) { |
| 520 | this.command = command; |
| 521 | } |
| 522 | |
| 523 | private Action action; |
| 524 | private PropertyChangeListener actionPropertyChangeListener; |
| 525 | |
| 526 | /** |
| 527 | * Sets the <code>Action</code> for the <code>ActionEvent</code> source. |
| 528 | * The new <code>Action</code> replaces |
| 529 | * any previously set <code>Action</code> but does not affect |
| 530 | * <code>ActionListeners</code> independently |
| 531 | * added with <code>addActionListener</code>. |
| 532 | * If the <code>Action</code> is already a registered |
| 533 | * <code>ActionListener</code> |
| 534 | * for the <code>ActionEvent</code> source, it is not re-registered. |
| 535 | * <p> |
| 536 | * Setting the <code>Action</code> results in immediately changing |
| 537 | * all the properties described in <a href="Action.html#buttonActions"> |
| 538 | * Swing Components Supporting <code>Action</code></a>. |
| 539 | * Subsequently, the textfield's properties are automatically updated |
| 540 | * as the <code>Action</code>'s properties change. |
| 541 | * <p> |
| 542 | * This method uses three other methods to set |
| 543 | * and help track the <code>Action</code>'s property values. |
| 544 | * It uses the <code>configurePropertiesFromAction</code> method |
| 545 | * to immediately change the textfield's properties. |
| 546 | * To track changes in the <code>Action</code>'s property values, |
| 547 | * this method registers the <code>PropertyChangeListener</code> |
| 548 | * returned by <code>createActionPropertyChangeListener</code>. The |
| 549 | * default {@code PropertyChangeListener} invokes the |
| 550 | * {@code actionPropertyChanged} method when a property in the |
| 551 | * {@code Action} changes. |
| 552 | * |
| 553 | * @param a the <code>Action</code> for the <code>JTextField</code>, |
| 554 | * or <code>null</code> |
| 555 | * @since 1.3 |
| 556 | * @see Action |
| 557 | * @see #getAction |
| 558 | * @see #configurePropertiesFromAction |
| 559 | * @see #createActionPropertyChangeListener |
| 560 | * @see #actionPropertyChanged |
| 561 | * @beaninfo |
| 562 | * bound: true |
| 563 | * attribute: visualUpdate true |
| 564 | * description: the Action instance connected with this ActionEvent source |
| 565 | */ |
| 566 | public void setAction(Action a) { |
| 567 | Action oldValue = getAction(); |
| 568 | if (action==null || !action.equals(a)) { |
| 569 | action = a; |
| 570 | if (oldValue!=null) { |
| 571 | removeActionListener(oldValue); |
| 572 | oldValue.removePropertyChangeListener(actionPropertyChangeListener); |
| 573 | actionPropertyChangeListener = null; |
| 574 | } |
| 575 | configurePropertiesFromAction(action); |
| 576 | if (action!=null) { |
| 577 | // Don't add if it is already a listener |
| 578 | if (!isListener(ActionListener.class, action)) { |
| 579 | addActionListener(action); |
| 580 | } |
| 581 | // Reverse linkage: |
| 582 | actionPropertyChangeListener = createActionPropertyChangeListener(action); |
| 583 | action.addPropertyChangeListener(actionPropertyChangeListener); |
| 584 | } |
| 585 | firePropertyChange("action", oldValue, action); |
| 586 | } |
| 587 | } |
| 588 | |
| 589 | private boolean isListener(Class c, ActionListener a) { |
| 590 | boolean isListener = false; |
| 591 | Object[] listeners = listenerList.getListenerList(); |
| 592 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 593 | if (listeners[i]==c && listeners[i+1]==a) { |
| 594 | isListener=true; |
| 595 | } |
| 596 | } |
| 597 | return isListener; |
| 598 | } |
| 599 | |
| 600 | /** |
| 601 | * Returns the currently set <code>Action</code> for this |
| 602 | * <code>ActionEvent</code> source, or <code>null</code> |
| 603 | * if no <code>Action</code> is set. |
| 604 | * |
| 605 | * @return the <code>Action</code> for this <code>ActionEvent</code> source, |
| 606 | * or <code>null</code> |
| 607 | * @since 1.3 |
| 608 | * @see Action |
| 609 | * @see #setAction |
| 610 | */ |
| 611 | public Action getAction() { |
| 612 | return action; |
| 613 | } |
| 614 | |
| 615 | /** |
| 616 | * Sets the properties on this textfield to match those in the specified |
| 617 | * <code>Action</code>. Refer to <a href="Action.html#buttonActions"> |
| 618 | * Swing Components Supporting <code>Action</code></a> for more |
| 619 | * details as to which properties this sets. |
| 620 | * |
| 621 | * @param a the <code>Action</code> from which to get the properties, |
| 622 | * or <code>null</code> |
| 623 | * @since 1.3 |
| 624 | * @see Action |
| 625 | * @see #setAction |
| 626 | */ |
| 627 | protected void configurePropertiesFromAction(Action a) { |
| 628 | AbstractAction.setEnabledFromAction(this, a); |
| 629 | AbstractAction.setToolTipTextFromAction(this, a); |
| 630 | setActionCommandFromAction(a); |
| 631 | } |
| 632 | |
| 633 | /** |
| 634 | * Updates the textfield's state in response to property changes in |
| 635 | * associated action. This method is invoked from the |
| 636 | * {@code PropertyChangeListener} returned from |
| 637 | * {@code createActionPropertyChangeListener}. Subclasses do not normally |
| 638 | * need to invoke this. Subclasses that support additional {@code Action} |
| 639 | * properties should override this and |
| 640 | * {@code configurePropertiesFromAction}. |
| 641 | * <p> |
| 642 | * Refer to the table at <a href="Action.html#buttonActions"> |
| 643 | * Swing Components Supporting <code>Action</code></a> for a list of |
| 644 | * the properties this method sets. |
| 645 | * |
| 646 | * @param action the <code>Action</code> associated with this textfield |
| 647 | * @param propertyName the name of the property that changed |
| 648 | * @since 1.6 |
| 649 | * @see Action |
| 650 | * @see #configurePropertiesFromAction |
| 651 | */ |
| 652 | protected void actionPropertyChanged(Action action, String propertyName) { |
| 653 | if (propertyName == Action.ACTION_COMMAND_KEY) { |
| 654 | setActionCommandFromAction(action); |
| 655 | } else if (propertyName == "enabled") { |
| 656 | AbstractAction.setEnabledFromAction(this, action); |
| 657 | } else if (propertyName == Action.SHORT_DESCRIPTION) { |
| 658 | AbstractAction.setToolTipTextFromAction(this, action); |
| 659 | } |
| 660 | } |
| 661 | |
| 662 | private void setActionCommandFromAction(Action action) { |
| 663 | setActionCommand((action == null) ? null : |
| 664 | (String)action.getValue(Action.ACTION_COMMAND_KEY)); |
| 665 | } |
| 666 | |
| 667 | /** |
| 668 | * Creates and returns a <code>PropertyChangeListener</code> that is |
| 669 | * responsible for listening for changes from the specified |
| 670 | * <code>Action</code> and updating the appropriate properties. |
| 671 | * <p> |
| 672 | * <b>Warning:</b> If you subclass this do not create an anonymous |
| 673 | * inner class. If you do the lifetime of the textfield will be tied to |
| 674 | * that of the <code>Action</code>. |
| 675 | * |
| 676 | * @param a the textfield's action |
| 677 | * @since 1.3 |
| 678 | * @see Action |
| 679 | * @see #setAction |
| 680 | */ |
| 681 | protected PropertyChangeListener createActionPropertyChangeListener(Action a) { |
| 682 | return new TextFieldActionPropertyChangeListener(this, a); |
| 683 | } |
| 684 | |
| 685 | private static class TextFieldActionPropertyChangeListener extends |
| 686 | ActionPropertyChangeListener<JTextField> { |
| 687 | TextFieldActionPropertyChangeListener(JTextField tf, Action a) { |
| 688 | super(tf, a); |
| 689 | } |
| 690 | |
| 691 | protected void actionPropertyChanged(JTextField textField, |
| 692 | Action action, |
| 693 | PropertyChangeEvent e) { |
| 694 | if (AbstractAction.shouldReconfigure(e)) { |
| 695 | textField.configurePropertiesFromAction(action); |
| 696 | } else { |
| 697 | textField.actionPropertyChanged(action, e.getPropertyName()); |
| 698 | } |
| 699 | } |
| 700 | } |
| 701 | |
| 702 | /** |
| 703 | * Fetches the command list for the editor. This is |
| 704 | * the list of commands supported by the plugged-in UI |
| 705 | * augmented by the collection of commands that the |
| 706 | * editor itself supports. These are useful for binding |
| 707 | * to events, such as in a keymap. |
| 708 | * |
| 709 | * @return the command list |
| 710 | */ |
| 711 | public Action[] getActions() { |
| 712 | return TextAction.augmentList(super.getActions(), defaultActions); |
| 713 | } |
| 714 | |
| 715 | /** |
| 716 | * Processes action events occurring on this textfield by |
| 717 | * dispatching them to any registered <code>ActionListener</code> objects. |
| 718 | * This is normally called by the controller registered with |
| 719 | * textfield. |
| 720 | */ |
| 721 | public void postActionEvent() { |
| 722 | fireActionPerformed(); |
| 723 | } |
| 724 | |
| 725 | // --- Scrolling support ----------------------------------- |
| 726 | |
| 727 | /** |
| 728 | * Gets the visibility of the text field. This can |
| 729 | * be adjusted to change the location of the visible |
| 730 | * area if the size of the field is greater than |
| 731 | * the area that was allocated to the field. |
| 732 | * |
| 733 | * <p> |
| 734 | * The fields look-and-feel implementation manages |
| 735 | * the values of the minimum, maximum, and extent |
| 736 | * properties on the <code>BoundedRangeModel</code>. |
| 737 | * |
| 738 | * @return the visibility |
| 739 | * @see BoundedRangeModel |
| 740 | */ |
| 741 | public BoundedRangeModel getHorizontalVisibility() { |
| 742 | return visibility; |
| 743 | } |
| 744 | |
| 745 | /** |
| 746 | * Gets the scroll offset, in pixels. |
| 747 | * |
| 748 | * @return the offset >= 0 |
| 749 | */ |
| 750 | public int getScrollOffset() { |
| 751 | return visibility.getValue(); |
| 752 | } |
| 753 | |
| 754 | /** |
| 755 | * Sets the scroll offset, in pixels. |
| 756 | * |
| 757 | * @param scrollOffset the offset >= 0 |
| 758 | */ |
| 759 | public void setScrollOffset(int scrollOffset) { |
| 760 | visibility.setValue(scrollOffset); |
| 761 | } |
| 762 | |
| 763 | /** |
| 764 | * Scrolls the field left or right. |
| 765 | * |
| 766 | * @param r the region to scroll |
| 767 | */ |
| 768 | public void scrollRectToVisible(Rectangle r) { |
| 769 | // convert to coordinate system of the bounded range |
| 770 | Insets i = getInsets(); |
| 771 | int x0 = r.x + visibility.getValue() - i.left; |
| 772 | int x1 = x0 + r.width; |
| 773 | if (x0 < visibility.getValue()) { |
| 774 | // Scroll to the left |
| 775 | visibility.setValue(x0); |
| 776 | } else if(x1 > visibility.getValue() + visibility.getExtent()) { |
| 777 | // Scroll to the right |
| 778 | visibility.setValue(x1 - visibility.getExtent()); |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | /** |
| 783 | * Returns true if the receiver has an <code>ActionListener</code> |
| 784 | * installed. |
| 785 | */ |
| 786 | boolean hasActionListener() { |
| 787 | // Guaranteed to return a non-null array |
| 788 | Object[] listeners = listenerList.getListenerList(); |
| 789 | // Process the listeners last to first, notifying |
| 790 | // those that are interested in this event |
| 791 | for (int i = listeners.length-2; i>=0; i-=2) { |
| 792 | if (listeners[i]==ActionListener.class) { |
| 793 | return true; |
| 794 | } |
| 795 | } |
| 796 | return false; |
| 797 | } |
| 798 | |
| 799 | // --- variables ------------------------------------------- |
| 800 | |
| 801 | /** |
| 802 | * Name of the action to send notification that the |
| 803 | * contents of the field have been accepted. Typically |
| 804 | * this is bound to a carriage-return. |
| 805 | */ |
| 806 | public static final String notifyAction = "notify-field-accept"; |
| 807 | |
| 808 | private BoundedRangeModel visibility; |
| 809 | private int horizontalAlignment = LEADING; |
| 810 | private int columns; |
| 811 | private int columnWidth; |
| 812 | private String command; |
| 813 | |
| 814 | private static final Action[] defaultActions = { |
| 815 | new NotifyAction() |
| 816 | }; |
| 817 | |
| 818 | /** |
| 819 | * @see #getUIClassID |
| 820 | * @see #readObject |
| 821 | */ |
| 822 | private static final String uiClassID = "TextFieldUI"; |
| 823 | |
| 824 | // --- Action implementations ----------------------------------- |
| 825 | |
| 826 | // Note that JFormattedTextField.CommitAction extends this |
| 827 | static class NotifyAction extends TextAction { |
| 828 | |
| 829 | NotifyAction() { |
| 830 | super(notifyAction); |
| 831 | } |
| 832 | |
| 833 | public void actionPerformed(ActionEvent e) { |
| 834 | JTextComponent target = getFocusedComponent(); |
| 835 | if (target instanceof JTextField) { |
| 836 | JTextField field = (JTextField) target; |
| 837 | field.postActionEvent(); |
| 838 | } |
| 839 | } |
| 840 | |
| 841 | public boolean isEnabled() { |
| 842 | JTextComponent target = getFocusedComponent(); |
| 843 | if (target instanceof JTextField) { |
| 844 | return ((JTextField)target).hasActionListener(); |
| 845 | } |
| 846 | return false; |
| 847 | } |
| 848 | } |
| 849 | |
| 850 | class ScrollRepainter implements ChangeListener, Serializable { |
| 851 | |
| 852 | public void stateChanged(ChangeEvent e) { |
| 853 | repaint(); |
| 854 | } |
| 855 | |
| 856 | } |
| 857 | |
| 858 | |
| 859 | /** |
| 860 | * See <code>readObject</code> and <code>writeObject</code> in |
| 861 | * <code>JComponent</code> for more |
| 862 | * information about serialization in Swing. |
| 863 | */ |
| 864 | private void writeObject(ObjectOutputStream s) throws IOException { |
| 865 | s.defaultWriteObject(); |
| 866 | if (getUIClassID().equals(uiClassID)) { |
| 867 | byte count = JComponent.getWriteObjCounter(this); |
| 868 | JComponent.setWriteObjCounter(this, --count); |
| 869 | if (count == 0 && ui != null) { |
| 870 | ui.installUI(this); |
| 871 | } |
| 872 | } |
| 873 | } |
| 874 | |
| 875 | |
| 876 | /** |
| 877 | * Returns a string representation of this <code>JTextField</code>. |
| 878 | * This method is intended to be used only for debugging purposes, |
| 879 | * and the content and format of the returned string may vary between |
| 880 | * implementations. The returned string may be empty but may not |
| 881 | * be <code>null</code>. |
| 882 | * |
| 883 | * @return a string representation of this <code>JTextField</code> |
| 884 | */ |
| 885 | protected String paramString() { |
| 886 | String horizontalAlignmentString; |
| 887 | if (horizontalAlignment == LEFT) { |
| 888 | horizontalAlignmentString = "LEFT"; |
| 889 | } else if (horizontalAlignment == CENTER) { |
| 890 | horizontalAlignmentString = "CENTER"; |
| 891 | } else if (horizontalAlignment == RIGHT) { |
| 892 | horizontalAlignmentString = "RIGHT"; |
| 893 | } else if (horizontalAlignment == LEADING) { |
| 894 | horizontalAlignmentString = "LEADING"; |
| 895 | } else if (horizontalAlignment == TRAILING) { |
| 896 | horizontalAlignmentString = "TRAILING"; |
| 897 | } else horizontalAlignmentString = ""; |
| 898 | String commandString = (command != null ? |
| 899 | command : ""); |
| 900 | |
| 901 | return super.paramString() + |
| 902 | ",columns=" + columns + |
| 903 | ",columnWidth=" + columnWidth + |
| 904 | ",command=" + commandString + |
| 905 | ",horizontalAlignment=" + horizontalAlignmentString; |
| 906 | } |
| 907 | |
| 908 | |
| 909 | ///////////////// |
| 910 | // Accessibility support |
| 911 | //////////////// |
| 912 | |
| 913 | |
| 914 | /** |
| 915 | * Gets the <code>AccessibleContext</code> associated with this |
| 916 | * <code>JTextField</code>. For <code>JTextFields</code>, |
| 917 | * the <code>AccessibleContext</code> takes the form of an |
| 918 | * <code>AccessibleJTextField</code>. |
| 919 | * A new <code>AccessibleJTextField</code> instance is created |
| 920 | * if necessary. |
| 921 | * |
| 922 | * @return an <code>AccessibleJTextField</code> that serves as the |
| 923 | * <code>AccessibleContext</code> of this <code>JTextField</code> |
| 924 | */ |
| 925 | public AccessibleContext getAccessibleContext() { |
| 926 | if (accessibleContext == null) { |
| 927 | accessibleContext = new AccessibleJTextField(); |
| 928 | } |
| 929 | return accessibleContext; |
| 930 | } |
| 931 | |
| 932 | /** |
| 933 | * This class implements accessibility support for the |
| 934 | * <code>JTextField</code> class. It provides an implementation of the |
| 935 | * Java Accessibility API appropriate to text field user-interface |
| 936 | * elements. |
| 937 | * <p> |
| 938 | * <strong>Warning:</strong> |
| 939 | * Serialized objects of this class will not be compatible with |
| 940 | * future Swing releases. The current serialization support is |
| 941 | * appropriate for short term storage or RMI between applications running |
| 942 | * the same version of Swing. As of 1.4, support for long term storage |
| 943 | * of all JavaBeans<sup><font size="-2">TM</font></sup> |
| 944 | * has been added to the <code>java.beans</code> package. |
| 945 | * Please see {@link java.beans.XMLEncoder}. |
| 946 | */ |
| 947 | protected class AccessibleJTextField extends AccessibleJTextComponent { |
| 948 | |
| 949 | /** |
| 950 | * Gets the state set of this object. |
| 951 | * |
| 952 | * @return an instance of AccessibleStateSet describing the states |
| 953 | * of the object |
| 954 | * @see AccessibleState |
| 955 | */ |
| 956 | public AccessibleStateSet getAccessibleStateSet() { |
| 957 | AccessibleStateSet states = super.getAccessibleStateSet(); |
| 958 | states.add(AccessibleState.SINGLE_LINE); |
| 959 | return states; |
| 960 | } |
| 961 | } |
| 962 | } |