1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26 package javax.swing.plaf.basic;
27
28 import sun.swing.SwingUtilities2;
29 import sun.swing.DefaultLookup;
30 import sun.swing.UIAction;
31 import sun.awt.AppContext;
32
33 import javax.swing.*;
34 import javax.swing.plaf.*;
35 import javax.swing.text.View;
36
37 import java.awt.event.ActionEvent;
38 import java.awt.event.ActionListener;
39 import java.awt.event.KeyEvent;
40 import java.awt.Component;
41 import java.awt.Container;
42 import java.awt.Dimension;
43 import java.awt.Rectangle;
44 import java.awt.Insets;
45 import java.awt.Color;
46 import java.awt.Graphics;
47 import java.awt.Font;
48 import java.awt.FontMetrics;
49 import java.beans.PropertyChangeEvent;
50 import java.beans.PropertyChangeListener;
51
52 /**
53 * A Windows L&F implementation of LabelUI. This implementation
54 * is completely static, i.e. there's only one UIView implementation
55 * that's shared by all JLabel objects.
56 *
57 * @author Hans Muller
58 */
59 public class BasicLabelUI extends LabelUI implements PropertyChangeListener
60 {
61 /**
62 * The default <code>BasicLabelUI</code> instance. This field might
63 * not be used. To change the default instance use a subclass which
64 * overrides the <code>createUI</code> method, and place that class
65 * name in defaults table under the key "LabelUI".
66 */
67 protected static BasicLabelUI labelUI = new BasicLabelUI();
68 private static final Object BASIC_LABEL_UI_KEY = new Object();
69
70 private Rectangle paintIconR = new Rectangle();
71 private Rectangle paintTextR = new Rectangle();
72
73 static void loadActionMap(LazyActionMap map) {
74 map.put(new Actions(Actions.PRESS));
75 map.put(new Actions(Actions.RELEASE));
76 }
77
78 /**
79 * Forwards the call to SwingUtilities.layoutCompoundLabel().
80 * This method is here so that a subclass could do Label specific
81 * layout and to shorten the method name a little.
82 *
83 * @param label an instance of {@code JLabel}
84 * @param fontMetrics a font metrics
85 * @param text a text
86 * @param icon an icon
87 * @param viewR a bounding rectangle to lay out label
88 * @param iconR a bounding rectangle to lay out icon
89 * @param textR a bounding rectangle to lay out text
90 * @return a possibly clipped version of the compound labels string
91 * @see SwingUtilities#layoutCompoundLabel
92 */
93 protected String layoutCL(
94 JLabel label,
95 FontMetrics fontMetrics,
96 String text,
97 Icon icon,
98 Rectangle viewR,
99 Rectangle iconR,
100 Rectangle textR)
101 {
102 return SwingUtilities.layoutCompoundLabel(
103 (JComponent) label,
104 fontMetrics,
105 text,
106 icon,
107 label.getVerticalAlignment(),
108 label.getHorizontalAlignment(),
109 label.getVerticalTextPosition(),
110 label.getHorizontalTextPosition(),
111 viewR,
112 iconR,
113 textR,
114 label.getIconTextGap());
115 }
116
117 /**
118 * Paint clippedText at textX, textY with the labels foreground color.
119 *
120 * @param l an instance of {@code JLabel}
121 * @param g an instance of {@code Graphics}
122 * @param s a text
123 * @param textX an X coordinate
124 * @param textY an Y coordinate
125 * @see #paint
126 * @see #paintDisabledText
127 */
128 protected void paintEnabledText(JLabel l, Graphics g, String s, int textX, int textY)
129 {
130 int mnemIndex = l.getDisplayedMnemonicIndex();
131 g.setColor(l.getForeground());
132 SwingUtilities2.drawStringUnderlineCharAt(l, g, s, mnemIndex,
133 textX, textY);
134 }
135
136
137 /**
138 * Paint clippedText at textX, textY with background.lighter() and then
139 * shifted down and to the right by one pixel with background.darker().
140 *
141 * @param l an instance of {@code JLabel}
142 * @param g an instance of {@code Graphics}
143 * @param s a text
144 * @param textX an X coordinate
145 * @param textY an Y coordinate
146 * @see #paint
147 * @see #paintEnabledText
148 */
149 protected void paintDisabledText(JLabel l, Graphics g, String s, int textX, int textY)
150 {
151 int accChar = l.getDisplayedMnemonicIndex();
152 Color background = l.getBackground();
153 g.setColor(background.brighter());
154 SwingUtilities2.drawStringUnderlineCharAt(l, g, s, accChar,
155 textX + 1, textY + 1);
156 g.setColor(background.darker());
157 SwingUtilities2.drawStringUnderlineCharAt(l, g, s, accChar,
158 textX, textY);
159 }
160
161 /**
162 * Paints the label text with the foreground color, if the label is opaque
163 * then paints the entire background with the background color. The Label
164 * text is drawn by {@link #paintEnabledText} or {@link #paintDisabledText}.
165 * The locations of the label parts are computed by {@link #layoutCL}.
166 *
167 * @see #paintEnabledText
168 * @see #paintDisabledText
169 * @see #layoutCL
170 */
171 public void paint(Graphics g, JComponent c)
172 {
173 JLabel label = (JLabel)c;
174 String text = label.getText();
175 Icon icon = (label.isEnabled()) ? label.getIcon() : label.getDisabledIcon();
176
177 if ((icon == null) && (text == null)) {
178 return;
179 }
180
181 FontMetrics fm = SwingUtilities2.getFontMetrics(label, g);
182 String clippedText = layout(label, fm, c.getWidth(), c.getHeight());
183
184 if (icon != null) {
185 icon.paintIcon(c, g, paintIconR.x, paintIconR.y);
186 }
187
188 if (text != null) {
189 View v = (View) c.getClientProperty(BasicHTML.propertyKey);
190 if (v != null) {
191 v.paint(g, paintTextR);
192 } else {
193 int textX = paintTextR.x;
194 int textY = paintTextR.y + fm.getAscent();
195
196 if (label.isEnabled()) {
197 paintEnabledText(label, g, clippedText, textX, textY);
198 }
199 else {
200 paintDisabledText(label, g, clippedText, textX, textY);
201 }
202 }
203 }
204 }
205
206 private String layout(JLabel label, FontMetrics fm,
207 int width, int height) {
208 Insets insets = label.getInsets(null);
209 String text = label.getText();
210 Icon icon = (label.isEnabled()) ? label.getIcon() :
211 label.getDisabledIcon();
212 Rectangle paintViewR = new Rectangle();
213 paintViewR.x = insets.left;
214 paintViewR.y = insets.top;
215 paintViewR.width = width - (insets.left + insets.right);
216 paintViewR.height = height - (insets.top + insets.bottom);
217 paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
218 paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;
219 return layoutCL(label, fm, text, icon, paintViewR, paintIconR,
220 paintTextR);
221 }
222
223 public Dimension getPreferredSize(JComponent c)
224 {
225 JLabel label = (JLabel)c;
226 String text = label.getText();
227 Icon icon = (label.isEnabled()) ? label.getIcon() :
228 label.getDisabledIcon();
229 Insets insets = label.getInsets(null);
230 Font font = label.getFont();
231
232 int dx = insets.left + insets.right;
233 int dy = insets.top + insets.bottom;
234
235 if ((icon == null) &&
236 ((text == null) ||
237 ((text != null) && (font == null)))) {
238 return new Dimension(dx, dy);
239 }
240 else if ((text == null) || ((icon != null) && (font == null))) {
241 return new Dimension(icon.getIconWidth() + dx,
242 icon.getIconHeight() + dy);
243 }
244 else {
245 FontMetrics fm = label.getFontMetrics(font);
246 Rectangle iconR = new Rectangle();
247 Rectangle textR = new Rectangle();
248 Rectangle viewR = new Rectangle();
249
250 iconR.x = iconR.y = iconR.width = iconR.height = 0;
251 textR.x = textR.y = textR.width = textR.height = 0;
252 viewR.x = dx;
253 viewR.y = dy;
254 viewR.width = viewR.height = Short.MAX_VALUE;
255
256 layoutCL(label, fm, text, icon, viewR, iconR, textR);
257 int x1 = Math.min(iconR.x, textR.x);
258 int x2 = Math.max(iconR.x + iconR.width, textR.x + textR.width);
259 int y1 = Math.min(iconR.y, textR.y);
260 int y2 = Math.max(iconR.y + iconR.height, textR.y + textR.height);
261 Dimension rv = new Dimension(x2 - x1, y2 - y1);
262
263 rv.width += dx;
264 rv.height += dy;
265 return rv;
266 }
267 }
268
269
270 /**
271 * @return getPreferredSize(c)
272 */
273 public Dimension getMinimumSize(JComponent c) {
274 Dimension d = getPreferredSize(c);
275 View v = (View) c.getClientProperty(BasicHTML.propertyKey);
276 if (v != null) {
277 d.width -= v.getPreferredSpan(View.X_AXIS) - v.getMinimumSpan(View.X_AXIS);
278 }
279 return d;
280 }
281
282 /**
283 * @return getPreferredSize(c)
284 */
285 public Dimension getMaximumSize(JComponent c) {
286 Dimension d = getPreferredSize(c);
287 View v = (View) c.getClientProperty(BasicHTML.propertyKey);
288 if (v != null) {
289 d.width += v.getMaximumSpan(View.X_AXIS) - v.getPreferredSpan(View.X_AXIS);
290 }
291 return d;
292 }
293
294 /**
295 * Returns the baseline.
296 *
297 * @throws NullPointerException {@inheritDoc}
298 * @throws IllegalArgumentException {@inheritDoc}
299 * @see javax.swing.JComponent#getBaseline(int, int)
300 * @since 1.6
301 */
302 public int getBaseline(JComponent c, int width, int height) {
303 super.getBaseline(c, width, height);
304 JLabel label = (JLabel)c;
305 String text = label.getText();
306 if (text == null || "".equals(text) || label.getFont() == null) {
307 return -1;
308 }
309 FontMetrics fm = label.getFontMetrics(label.getFont());
310 layout(label, fm, width, height);
311 return BasicHTML.getBaseline(label, paintTextR.y, fm.getAscent(),
312 paintTextR.width, paintTextR.height);
313 }
314
315 /**
316 * Returns an enum indicating how the baseline of the component
317 * changes as the size changes.
318 *
319 * @throws NullPointerException {@inheritDoc}
320 * @see javax.swing.JComponent#getBaseline(int, int)
321 * @since 1.6
322 */
323 public Component.BaselineResizeBehavior getBaselineResizeBehavior(
324 JComponent c) {
325 super.getBaselineResizeBehavior(c);
326 if (c.getClientProperty(BasicHTML.propertyKey) != null) {
327 return Component.BaselineResizeBehavior.OTHER;
328 }
329 switch(((JLabel)c).getVerticalAlignment()) {
330 case JLabel.TOP:
331 return Component.BaselineResizeBehavior.CONSTANT_ASCENT;
332 case JLabel.BOTTOM:
333 return Component.BaselineResizeBehavior.CONSTANT_DESCENT;
334 case JLabel.CENTER:
335 return Component.BaselineResizeBehavior.CENTER_OFFSET;
336 }
337 return Component.BaselineResizeBehavior.OTHER;
338 }
339
340
341 public void installUI(JComponent c) {
342 installDefaults((JLabel)c);
343 installComponents((JLabel)c);
344 installListeners((JLabel)c);
345 installKeyboardActions((JLabel)c);
346 }
347
348
349 public void uninstallUI(JComponent c) {
350 uninstallDefaults((JLabel) c);
351 uninstallComponents((JLabel) c);
352 uninstallListeners((JLabel) c);
353 uninstallKeyboardActions((JLabel) c);
354 }
355
356 /**
357 * Installs default properties.
358 *
359 * @param c an instance of {@code JLabel}
360 */
361 protected void installDefaults(JLabel c){
362 LookAndFeel.installColorsAndFont(c, "Label.background", "Label.foreground", "Label.font");
363 LookAndFeel.installProperty(c, "opaque", Boolean.FALSE);
364 }
365
366 /**
367 * Registers listeners.
368 *
369 * @param c an instance of {@code JLabel}
370 */
371 protected void installListeners(JLabel c){
372 c.addPropertyChangeListener(this);
373 }
374
375 /**
376 * Registers components.
377 *
378 * @param c an instance of {@code JLabel}
379 */
380 protected void installComponents(JLabel c){
381 BasicHTML.updateRenderer(c, c.getText());
382 c.setInheritsPopupMenu(true);
383 }
384
385 /**
386 * Registers keyboard actions.
387 *
388 * @param l an instance of {@code JLabel}
389 */
390 protected void installKeyboardActions(JLabel l) {
391 int dka = l.getDisplayedMnemonic();
392 Component lf = l.getLabelFor();
393 if ((dka != 0) && (lf != null)) {
394 LazyActionMap.installLazyActionMap(l, BasicLabelUI.class,
395 "Label.actionMap");
396 InputMap inputMap = SwingUtilities.getUIInputMap
397 (l, JComponent.WHEN_IN_FOCUSED_WINDOW);
398 if (inputMap == null) {
399 inputMap = new ComponentInputMapUIResource(l);
400 SwingUtilities.replaceUIInputMap(l,
401 JComponent.WHEN_IN_FOCUSED_WINDOW, inputMap);
402 }
403 inputMap.clear();
404 inputMap.put(KeyStroke.getKeyStroke(dka, BasicLookAndFeel.getFocusAcceleratorKeyMask(), false), "press");
405 }
406 else {
407 InputMap inputMap = SwingUtilities.getUIInputMap
408 (l, JComponent.WHEN_IN_FOCUSED_WINDOW);
409 if (inputMap != null) {
410 inputMap.clear();
411 }
412 }
413 }
414
415 /**
416 * Uninstalls default properties.
417 *
418 * @param c an instance of {@code JLabel}
419 */
420 protected void uninstallDefaults(JLabel c){
421 }
422
423 /**
424 * Unregisters listeners.
425 *
426 * @param c an instance of {@code JLabel}
427 */
428 protected void uninstallListeners(JLabel c){
429 c.removePropertyChangeListener(this);
430 }
431
432 /**
433 * Unregisters components.
434 *
435 * @param c an instance of {@code JLabel}
436 */
437 protected void uninstallComponents(JLabel c){
438 BasicHTML.updateRenderer(c, "");
439 }
440
441 /**
442 * Unregisters keyboard actions.
443 *
444 * @param c an instance of {@code JLabel}
445 */
446 protected void uninstallKeyboardActions(JLabel c) {
447 SwingUtilities.replaceUIInputMap(c, JComponent.WHEN_FOCUSED, null);
448 SwingUtilities.replaceUIInputMap(c, JComponent.WHEN_IN_FOCUSED_WINDOW,
449 null);
450 SwingUtilities.replaceUIActionMap(c, null);
451 }
452
453 /**
454 * Returns an instance of {@code BasicLabelUI}.
455 *
456 * @param c a component
457 * @return an instance of {@code BasicLabelUI}
458 */
459 public static ComponentUI createUI(JComponent c) {
460 if (System.getSecurityManager() != null) {
461 AppContext appContext = AppContext.getAppContext();
462 BasicLabelUI safeBasicLabelUI =
463 (BasicLabelUI) appContext.get(BASIC_LABEL_UI_KEY);
464 if (safeBasicLabelUI == null) {
465 safeBasicLabelUI = new BasicLabelUI();
466 appContext.put(BASIC_LABEL_UI_KEY, safeBasicLabelUI);
467 }
468 return safeBasicLabelUI;
469 }
470 return labelUI;
471 }
472
473 public void propertyChange(PropertyChangeEvent e) {
474 String name = e.getPropertyName();
475 if (name == "text" || "font" == name || "foreground" == name ||
476 "ancestor" == name || "graphicsConfig" == name) {
477 // remove the old html view client property if one
478 // existed, and install a new one if the text installed
479 // into the JLabel is html source.
480 JLabel lbl = ((JLabel) e.getSource());
481 String text = lbl.getText();
482 BasicHTML.updateRenderer(lbl, text);
483 }
484 else if (name == "labelFor" || name == "displayedMnemonic") {
485 installKeyboardActions((JLabel) e.getSource());
486 }
487 }
488
489 // When the accelerator is pressed, temporarily make the JLabel
490 // focusTraversable by registering a WHEN_FOCUSED action for the
491 // release of the accelerator. Then give it focus so it can
492 // prevent unwanted keyTyped events from getting to other components.
493 private static class Actions extends UIAction {
494 private static final String PRESS = "press";
495 private static final String RELEASE = "release";
496
497 Actions(String key) {
498 super(key);
499 }
500
501 public void actionPerformed(ActionEvent e) {
502 JLabel label = (JLabel)e.getSource();
503 String key = getName();
504 if (key == PRESS) {
505 doPress(label);
506 }
507 else if (key == RELEASE) {
508 doRelease(label, e.getActionCommand() != null);
509 }
510 }
511
512 private void doPress(JLabel label) {
513 Component labelFor = label.getLabelFor();
514 if (labelFor != null && labelFor.isEnabled()) {
515 InputMap inputMap = SwingUtilities.getUIInputMap(label, JComponent.WHEN_FOCUSED);
516 if (inputMap == null) {
517 inputMap = new InputMapUIResource();
518 SwingUtilities.replaceUIInputMap(label, JComponent.WHEN_FOCUSED, inputMap);
519 }
520 int dka = label.getDisplayedMnemonic();
521 putOnRelease(inputMap, dka, BasicLookAndFeel
522 .getFocusAcceleratorKeyMask());
523 // Need this when the sticky keys are enabled
524 putOnRelease(inputMap, dka, 0);
525 // Need this if ALT is released before the accelerator
526 putOnRelease(inputMap, KeyEvent.VK_ALT, 0);
527 label.requestFocus();
528 }
529 }
530
531 private void doRelease(JLabel label, boolean isCommand) {
532 Component labelFor = label.getLabelFor();
533 if (labelFor != null && labelFor.isEnabled()) {
534 if (label.hasFocus()) {
535 InputMap inputMap = SwingUtilities.getUIInputMap(label,
536 JComponent.WHEN_FOCUSED);
537 if (inputMap != null) {
538 // inputMap should never be null.
539 int dka = label.getDisplayedMnemonic();
540 removeOnRelease(inputMap, dka, BasicLookAndFeel
541 .getFocusAcceleratorKeyMask());
542 removeOnRelease(inputMap, dka, 0);
543 removeOnRelease(inputMap, KeyEvent.VK_ALT, 0);
544 }
545 inputMap = SwingUtilities.getUIInputMap(label,
546 JComponent.WHEN_IN_FOCUSED_WINDOW);
547 if (inputMap == null) {
548 inputMap = new InputMapUIResource();
549 SwingUtilities.replaceUIInputMap(label,
550 JComponent.WHEN_IN_FOCUSED_WINDOW, inputMap);
551 }
552 int dka = label.getDisplayedMnemonic();
553 if (isCommand) {
554 putOnRelease(inputMap, KeyEvent.VK_ALT, 0);
555 } else {
556 putOnRelease(inputMap, dka, BasicLookAndFeel
557 .getFocusAcceleratorKeyMask());
558 // Need this when the sticky keys are enabled
559 putOnRelease(inputMap, dka, 0);
560 }
561 if (labelFor instanceof Container &&
562 ((Container) labelFor).isFocusCycleRoot()) {
563 labelFor.requestFocus();
564 } else {
565 SwingUtilities2.compositeRequestFocus(labelFor);
566 }
567 } else {
568 InputMap inputMap = SwingUtilities.getUIInputMap(label,
569 JComponent.WHEN_IN_FOCUSED_WINDOW);
570 int dka = label.getDisplayedMnemonic();
571 if (inputMap != null) {
572 if (isCommand) {
573 removeOnRelease(inputMap, dka, BasicLookAndFeel
574 .getFocusAcceleratorKeyMask());
575 removeOnRelease(inputMap, dka, 0);
576 } else {
577 removeOnRelease(inputMap, KeyEvent.VK_ALT, 0);
578 }
579 }
580 }
581 }
582 }
583
584 private void putOnRelease(InputMap inputMap, int keyCode, int modifiers) {
585 inputMap.put(KeyStroke.getKeyStroke(keyCode, modifiers, true),
586 RELEASE);
587 }
588
589 private void removeOnRelease(InputMap inputMap, int keyCode, int modifiers) {
590 inputMap.remove(KeyStroke.getKeyStroke(keyCode, modifiers, true));
591 }
592
593 }
594 }