1 /*
2 * Copyright (c) 2016, 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 java.awt;
27
28 import java.awt.peer.TaskbarPeer;
29 import sun.awt.SunToolkit;
30
31 /**
32 * The {@code Taskbar} class allows a Java application to interact with
33 * the system task area (taskbar, Dock, etc.).
34 *
35 * <p>
36 * There are a variety of interactions depending on the current platform such as
37 * displaying progress of some task, appending user-specified menu to the application
38 * icon context menu, etc.
39 *
40 * @implNote Linux support is currently limited to Unity. However to make these
41 * features work on Unity, the app should be run from a .desktop file with
42 * specified {@code java.desktop.appName} system property set to this .desktop
43 * file name:
44 * {@code Exec=java -Djava.desktop.appName=MyApp.desktop -jar /path/to/myapp.jar}
45 * see <a href="https://help.ubuntu.com/community/UnityLaunchersAndDesktopFiles">
46 * https://help.ubuntu.com/community/UnityLaunchersAndDesktopFiles</a>
47 *
48 * @since 9
49 */
50
51 public class Taskbar {
52
53 /**
54 * List of provided features. Each platform supports a different
55 * set of features. You may use the {@link Taskbar#isSupported}
56 * method to determine if the given feature is supported by the
57 * current platform.
58 */
59 public static enum Feature {
60
61 /**
62 * Represents a textual icon badge feature.
63 * @see #setIconBadge(java.lang.String)
64 */
65 ICON_BADGE_TEXT,
66
67 /**
68 * Represents a numerical icon badge feature.
69 * @see #setIconBadge(java.lang.String)
70 */
71 ICON_BADGE_NUMBER,
72
73 /**
74 * Represents a graphical icon badge feature for a window.
75 * @see #setWindowIconBadge(java.awt.Window, java.awt.Image)
76 */
77 ICON_BADGE_IMAGE_WINDOW,
78
79 /**
80 * Represents an icon feature.
81 * @see #setIconImage(java.awt.Image)
82 */
83 ICON_IMAGE,
84
85 /**
86 * Represents a menu feature.
87 * @see #setMenu(java.awt.PopupMenu)
88 * @see #getMenu()
89 */
90 MENU,
91
92 /**
93 * Represents a progress state feature for a specified window.
94 * @see #setWindowProgressState(java.awt.Window, State)
95 */
96 PROGRESS_STATE_WINDOW,
97
98 /**
99 * Represents a progress value feature.
100 * @see #setProgressValue(int)
101 */
102 PROGRESS_VALUE,
103
104 /**
105 * Represents a progress value feature for a specified window.
106 * @see #setWindowProgressValue(java.awt.Window, int)
107 */
108 PROGRESS_VALUE_WINDOW,
109
110 /**
111 * Represents a user attention request feature.
112 * @see #requestUserAttention(boolean, boolean)
113 */
114 USER_ATTENTION,
115
116 /**
117 * Represents a user attention request feature for a specified window.
118 * @see #requestWindowUserAttention(java.awt.Window)
119 */
120 USER_ATTENTION_WINDOW
121 }
122
123 /**
124 * Kinds of available window progress states.
125 *
126 * @see #setWindowProgressState(java.awt.Window, java.awt.Taskbar.State)
127 */
128 public static enum State {
129 /**
130 * Stops displaying the progress.
131 */
132 OFF,
133 /**
134 * The progress indicator displays with normal color and determinate
135 * mode.
136 */
137 NORMAL,
138 /**
139 * Shows progress as paused, progress can be resumed by the user.
140 * Switches to the determinate display.
141 */
142 PAUSED,
143 /**
144 * The progress indicator displays activity without specifying what
145 * proportion of the progress is complete.
146 */
147 INDETERMINATE,
148 /**
149 * Shows that an error has occurred. Switches to the determinate
150 * display.
151 */
152 ERROR
153 }
154
155 private TaskbarPeer peer;
156
157 /**
158 * Tests whether a {@code Feature} is supported on the current platform.
159 * @param feature the specified {@link Feature}
160 * @return true if the specified feature is supported on the current platform
161 */
162 public boolean isSupported(Feature feature) {
163 return peer.isSupported(feature);
164 }
165
166 /**
167 * Checks if the feature type is supported.
168 *
169 * @param featureType the action type in question
170 * @throws UnsupportedOperationException if the specified action type is not
171 * supported on the current platform
172 */
173 private void checkFeatureSupport(Feature featureType){
174 if (!isSupported(featureType)) {
175 throw new UnsupportedOperationException("The " + featureType.name()
176 + " feature is not supported on the current platform!");
177 }
178 }
179
180 /**
181 * Calls to the security manager's {@code checkPermission} method with
182 * an {@code RuntimePermission("canProcessApplicationEvents")} permissions.
183 */
184 private void checkEventsProcessingPermission(){
185 SecurityManager sm = System.getSecurityManager();
186 if (sm != null) {
187 sm.checkPermission(new RuntimePermission(
188 "canProcessApplicationEvents"));
189 }
190 }
191
192 private Taskbar() {
193 Toolkit defaultToolkit = Toolkit.getDefaultToolkit();
194 if (defaultToolkit instanceof SunToolkit) {
195 peer = ((SunToolkit) defaultToolkit).createTaskbarPeer(this);
196 }
197 }
198
199 private static Taskbar taskbar;
200
201 /**
202 * Returns the {@code Taskbar} instance of the current
203 * taskbar context. On some platforms the Taskbar API may not be
204 * supported; use the {@link #isTaskbarSupported} method to
205 * determine if the current taskbar is supported.
206 * @return the Taskbar instance
207 * @throws HeadlessException if {@link
208 * GraphicsEnvironment#isHeadless()} returns {@code true}
209 * @throws UnsupportedOperationException if this class is not
210 * supported on the current platform
211 * @see #isTaskbarSupported()
212 * @see java.awt.GraphicsEnvironment#isHeadless
213 */
214 public static synchronized Taskbar getTaskbar(){
215 if (GraphicsEnvironment.isHeadless()) throw new HeadlessException();
216
217 if (!Taskbar.isTaskbarSupported()) {
218 throw new UnsupportedOperationException("Taskbar API is not " +
219 "supported on the current platform");
220 }
221
222 Taskbar taskbar = null;
223 sun.awt.AppContext context = sun.awt.AppContext.getAppContext();
224
225 taskbar = (context == null)
226 ? Taskbar.taskbar
227 : (Taskbar)context.get(Taskbar.class);
228
229 if (taskbar == null) {
230 taskbar = new Taskbar();
231 if (context != null) {
232 context.put(Taskbar.class, taskbar);
233 }
234 }
235
236 return taskbar;
237 }
238
239 /**
240 * Tests whether this class is supported on the current platform.
241 * If it's supported, use {@link #getTaskbar()} to retrieve an
242 * instance.
243 *
244 * @return {@code true} if this class is supported on the
245 * current platform; {@code false} otherwise
246 * @see #getTaskbar()
247 */
248 public static boolean isTaskbarSupported(){
249 Toolkit defaultToolkit = Toolkit.getDefaultToolkit();
250 if (defaultToolkit instanceof SunToolkit) {
251 return ((SunToolkit)defaultToolkit).isTaskbarSupported();
252 }
253 return false;
254 }
255
256 /**
257 * Requests user attention to this application.
258 *
259 * Depending on the platform, this may be visually indicated by a bouncing
260 * or flashing icon in the task area. It may have no effect on an already active
261 * application.
262 *
263 * On some platforms (e.g. Mac OS) this effect may disappear upon app activation
264 * and cannot be dismissed by setting {@code enabled} to false.
265 * Other platforms may require an additional call
266 * {@link #requestUserAttention} to dismiss this request
267 * with {@code enabled} parameter set to false.
268 *
269 * @param enabled disables this request if false
270 * @param critical if this is an important request
271 * @throws SecurityException if a security manager exists and it denies the
272 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
273 * @throws UnsupportedOperationException if the current platform
274 * does not support the {@link Taskbar.Feature#USER_ATTENTION} feature
275 */
276 public void requestUserAttention(final boolean enabled, final boolean critical) {
277 checkEventsProcessingPermission();
278 checkFeatureSupport(Feature.USER_ATTENTION);
279 peer.requestUserAttention(enabled, critical);
280 }
281
282 /**
283 * Requests user attention to the specified window.
284 *
285 * @param w window
286 * @throws SecurityException if a security manager exists and it denies the
287 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
288 * @throws UnsupportedOperationException if the current platform
289 * does not support the {@link Taskbar.Feature#USER_ATTENTION_WINDOW} feature
290 */
291 public void requestWindowUserAttention(Window w) {
292 checkEventsProcessingPermission();
293 checkFeatureSupport(Feature.USER_ATTENTION_WINDOW);
294 peer.requestWindowUserAttention(w);
295 }
296
297 /**
298 * Attaches the contents of the provided PopupMenu to the application icon
299 * in the task area.
300 *
301 * @param menu the PopupMenu to attach to this application
302 * @throws SecurityException if a security manager exists and it denies the
303 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
304 * @throws UnsupportedOperationException if the current platform
305 * does not support the {@link Taskbar.Feature#MENU} feature
306 */
307 public void setMenu(final PopupMenu menu) {
308 checkEventsProcessingPermission();
309 checkFeatureSupport(Feature.MENU);
310 peer.setMenu(menu);
311 }
312
313 /**
314 * Gets PopupMenu used to add items to this application's icon in system task area.
315 *
316 * @return the PopupMenu
317 * @throws SecurityException if a security manager exists and it denies the
318 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
319 * @throws UnsupportedOperationException if the current platform
320 * does not support the {@link Taskbar.Feature#MENU} feature
321 */
322 public PopupMenu getMenu() {
323 checkEventsProcessingPermission();
324 checkFeatureSupport(Feature.MENU);
325 return peer.getMenu();
326 }
327
328 /**
329 * Changes this application's icon to the provided image.
330 *
331 * @param image to change
332 * @throws SecurityException if a security manager exists and it denies the
333 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
334 * @throws UnsupportedOperationException if the current platform
335 * does not support the {@link Taskbar.Feature#ICON_IMAGE} feature
336 */
337 public void setIconImage(final Image image) {
338 checkEventsProcessingPermission();
339 checkFeatureSupport(Feature.ICON_IMAGE);
340 peer.setIconImage(image);
341 }
342
343 /**
344 * Obtains an image of this application's icon.
345 *
346 * @return an image of this application's icon
347 * @throws SecurityException if a security manager exists and it denies the
348 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
349 * @throws UnsupportedOperationException if the current platform
350 * does not support the {@link Taskbar.Feature#ICON_IMAGE} feature
351 */
352 public Image getIconImage() {
353 checkEventsProcessingPermission();
354 checkFeatureSupport(Feature.ICON_IMAGE);
355 return peer.getIconImage();
356 }
357
358 /**
359 * Affixes a small system-provided badge to this application's icon.
360 * Usually a number.
361 *
362 * Some platforms do not support string values and accept only integer
363 * values. In this case, pass an integer represented as a string as parameter.
364 * This can be tested by {@code Feature.ICON_BADGE_TEXT} and
365 * {@code Feature.ICON_BADGE_NUMBER}.
366 *
367 * Passing {@code null} as parameter hides the badge.
368 * @param badge label to affix to the icon
369 * @throws SecurityException if a security manager exists and it denies the
370 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
371 * @throws UnsupportedOperationException if the current platform
372 * does not support the {@link Taskbar.Feature#ICON_BADGE_NUMBER}
373 * or {@link Taskbar.Feature#ICON_BADGE_TEXT} feature
374 */
375 public void setIconBadge(final String badge) {
376 checkEventsProcessingPermission();
377 checkFeatureSupport(Feature.ICON_BADGE_NUMBER);
378 peer.setIconBadge(badge);
379 }
380
381 /**
382 * Affixes a small badge to this application's icon in the task area
383 * for the specified window.
384 * It may be disabled by system settings.
385 *
386 * @param w window to update
387 * @param badge image to affix to the icon
388 * @throws SecurityException if a security manager exists and it denies the
389 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
390 * @throws UnsupportedOperationException if the current platform
391 * does not support the {@link Taskbar.Feature#ICON_BADGE_IMAGE_WINDOW} feature
392 */
393 public void setWindowIconBadge(Window w, final Image badge) {
394 checkEventsProcessingPermission();
395 checkFeatureSupport(Feature.ICON_BADGE_IMAGE_WINDOW);
396 if (w != null) {
397 peer.setWindowIconBadge(w, badge);
398 }
399 }
400
401
402 /**
403 * Affixes a small system-provided progress bar to this application's icon.
404 *
405 * @param value from 0 to 100, other to disable progress indication
406 * @throws SecurityException if a security manager exists and it denies the
407 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
408 * @throws UnsupportedOperationException if the current platform
409 * does not support the {@link Taskbar.Feature#PROGRESS_VALUE} feature
410 */
411 public void setProgressValue(int value) {
412 checkEventsProcessingPermission();
413 checkFeatureSupport(Feature.PROGRESS_VALUE);
414 peer.setProgressValue(value);
415 }
416
417 /**
418 * Displays a determinate progress bar in the task area for the specified
419 * window.
420 * <br>
421 * The visual behavior is platform and {@link State} dependent.
422 * <br>
423 * This call cancels the {@link State#INDETERMINATE INDETERMINATE} state
424 * of the window.
425 * <br>
426 * Note that when multiple windows is grouped in the task area
427 * the behavior is platform specific.
428 *
429 * @param w window to update
430 * @param value from 0 to 100, other to switch to {@link State#OFF} state
431 * and disable progress indication
432 * @see #setWindowProgressState(java.awt.Window, State)
433 * @throws SecurityException if a security manager exists and it denies the
434 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
435 * @throws UnsupportedOperationException if the current platform
436 * does not support the {@link Taskbar.Feature#PROGRESS_VALUE_WINDOW} feature
437 */
438 public void setWindowProgressValue(Window w, int value) {
439 checkEventsProcessingPermission();
440 checkFeatureSupport(Feature.PROGRESS_VALUE_WINDOW);
441 if (w != null) {
442 peer.setWindowProgressValue(w, value);
443 }
444 }
445
446 /**
447 * Sets a progress state for a specified window.
448 * <br>
449 * Each state displays a progress in a platform-dependent way.
450 * <br>
451 * Note than switching from {@link State#INDETERMINATE INDETERMINATE} state
452 * to any of determinate states may reset value set by
453 * {@link #setWindowProgressValue(java.awt.Window, int) setWindowProgressValue}
454 *
455 * @param w window
456 * @param state to change to
457 * @see State#OFF
458 * @see State#NORMAL
459 * @see State#PAUSED
460 * @see State#ERROR
461 * @see State#INDETERMINATE
462 * @see #setWindowProgressValue(java.awt.Window, int)
463 * @throws SecurityException if a security manager exists and it denies the
464 * {@code RuntimePermission("canProcessApplicationEvents")} permission.
465 * @throws UnsupportedOperationException if the current platform
466 * does not support the {@link Taskbar.Feature#PROGRESS_STATE_WINDOW} feature
467 */
468 public void setWindowProgressState(Window w, State state) {
469 checkEventsProcessingPermission();
470 checkFeatureSupport(Feature.PROGRESS_STATE_WINDOW);
471 if (w != null) {
472 peer.setWindowProgressState(w, state);
473 }
474 }
475 }