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4 This file is part of GNU Classpath.
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21 Linking this library statically or dynamically with other modules is
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41 import java.awt.event.ActionEvent;
42 import java.awt.event.ActionListener;
43 import java.io.Serializable;
44 import java.util.EventListener;
46 import javax.swing.event.EventListenerList;
49 * Fires one or more action events after the specified delay. This is
50 * a specialised version of <code>java.util.Timer</code> just for
51 * firing <code>ActionEvent</code>s. All Timers share one (daemon)
52 * Thread (or java.util.Timer). All events are fired from the event
55 * @author Ronald Veldema
56 * @author Audrius Meskauskas (audriusa@Bionformatics.org) - bug fixes
57 * and documentation comments
60 implements Serializable
63 * Given to the shared java.util.Timer to (possibly repeatedly) call
66 private class Task extends java.util.TimerTask
71 System.out.println("javax.swing.Timer -> queueEvent()");
80 * Use serialVersionUID for interoperability.
82 private static final long serialVersionUID = -1116180831621385484L;
85 * The encloding class, used with {@link SwingUtilities#invokeLater}
86 * to invoke the {@link #drainEvents()}.
88 private Runnable drainer = new Runnable()
97 * The static java.util.Timer daemon which will be used to schedule
98 * all javax.swing.Timer.Task objects. The daemon will always be
99 * running, even if there's no task scheduled in it.
101 private static java.util.Timer timer = new java.util.Timer("swing.Timer",
105 * If <code>true</code>, the timer prints a message to
106 * {@link System#out} when firing each event.
108 static boolean logTimers;
111 * A field to store all listeners who are listening to this timer.
113 protected EventListenerList listenerList = new EventListenerList();
116 * <code>true</code> if the timer coalesces events.
118 boolean coalesce = true;
121 * <code>true</code> if the timer is firing repetetive events.
123 boolean repeats = true;
126 * The delay between subsequent repetetive events.
131 * The initial delay before the first event.
136 * The number of events that have been already fired by this timer.
137 * This is used as a numeric identifier for the next event that would
143 * The task that calls queueEvent(). When null this Timer is stopped.
144 * This is package private to avoid synthetic accessor method.
149 * This object manages a "queue" of virtual actionEvents, maintained as a
150 * simple long counter. When the timer expires, a new event is queued,
151 * and a dispatcher object is pushed into the system event queue. When
152 * the system thread runs the dispatcher, it will fire as many
153 * ActionEvents as have been queued, unless the timer is set to
154 * coalescing mode, in which case it will fire only one ActionEvent.
159 * <code>synchronized(queueLock)</code> replaces
160 * <code>synchronized(queue)</code> that is not supported by this language.
162 private Object queueLock = new Object();
165 * Creates a new Timer object.
167 * @param d the default value for both initial and between event delay, in
169 * @param listener the first action listener, can be <code>null</code>.
171 public Timer(int d, ActionListener listener)
176 if (listener != null)
177 addActionListener(listener);
181 * Get the array of action listeners.
183 * @return the array of action listeners that are listening for the events,
184 * fired by this timer
188 public ActionListener[] getActionListeners()
190 return (ActionListener[]) listenerList.getListeners(ActionListener.class);
194 * Sets whether the Timer coalesces multiple pending event firings.
195 * If the coalescing is enabled, the multiple events that have not been
196 * fired on time are replaced by the single event. The events may not
197 * be fired on time if the application is busy.
199 * @param c <code>true</code> (default) to enable the event coalescing,
200 * <code>false</code> otherwise
202 public void setCoalesce(boolean c)
208 * Checks if the Timer coalesces multiple pending event firings.
209 * If the coalescing is enabled, the multiple events that have not been
210 * fired on time are replaced by the single event. The events may not
211 * be fired on time if the application is busy.
213 * @return <code>true</code> if the coalescing is enabled,
214 * <code>false</code> otherwise
216 public boolean isCoalesce()
222 * Get the event listeners of the given type that are listening for the
223 * events, fired by this timer.
225 * @param listenerType the listener type (for example, ActionListener.class)
227 * @return the array of event listeners that are listening for the events,
228 * fired by this timer
231 public <T extends EventListener> T[] getListeners(Class<T> listenerType)
233 return listenerList.getListeners(listenerType);
237 * Set the timer logging state. If it is set to <code>true</code>, the
238 * timer prints a message to {@link System#out} when firing each
241 * @param lt <code>true</code> if logging is enabled, <code>false</code>
242 * (default value) otherwise
244 public static void setLogTimers(boolean lt)
250 * Return the logging state.
252 * @return <code>true</code> if the timer is printing a message to
254 * when firing each action event
256 public static boolean getLogTimers()
262 * Set the delay between firing the subsequent events.
263 * This parameter does not change the value of the initial delay before
264 * firing the first event.
266 * @param d The time gap between the subsequent events, in milliseconds
268 * @throws IllegalArgumentException if <code>d</code> is less than zero.
270 public void setDelay(int d)
273 throw new IllegalArgumentException("Invalid delay: " + d);
278 * Get the delay between firing the subsequent events.
280 * @return The delay between subsequent events, in milliseconds
282 public int getDelay()
288 * Set the intial delay before firing the first event since calling
289 * the {@link #start()} method. If the initial delay has not been
290 * set, it is assumed having the same value as the delay between the
293 * @param i the initial delay, in milliseconds
295 * @throws IllegalArgumentException if <code>i</code> is less than zero.
297 public void setInitialDelay(int i)
300 throw new IllegalArgumentException("Invalid initial delay: " + i);
305 * Get the intial delay before firing the first event since calling
306 * the {@link #start()} method. If the initial delay has not been
307 * set, returns the same value as {@link #getDelay()}.
309 * @return the initial delay before firing the first action event.
311 public int getInitialDelay()
317 * Enable firing the repetetive events.
319 * @param r <code>true</code> (default value) to fire repetetive events.
320 * <code>false</code> to fire
321 * only one event after the initial delay
323 public void setRepeats(boolean r)
329 * Check is this timer fires repetetive events.
331 * @return <code>true</code> if the timer fires repetetive events,
332 * <code>false</code> if it fires
333 * only one event after the initial delay
335 public boolean isRepeats()
341 * Get the timer state.
343 * @return <code>true</code> if the timer has been started and is firing
344 * the action events as scheduled. <code>false</code>
345 * if the timer is inactive.
347 public boolean isRunning()
353 * Add the action listener
355 * @param listener the action listener to add
357 public void addActionListener(ActionListener listener)
359 listenerList.add(ActionListener.class, listener);
363 * Remove the action listener.
365 * @param listener the action listener to remove
367 public void removeActionListener(ActionListener listener)
369 listenerList.remove(ActionListener.class, listener);
373 * Cancel all pending tasks and fire the first event after the initial
376 public void restart()
383 * Start firing the action events.
392 timer.schedule(t, getInitialDelay(), getDelay());
394 timer.schedule(t, getInitialDelay());
400 * Stop firing the action events.
413 * Fire the given action event to the action listeners.
415 * @param event the event to fire
417 protected void fireActionPerformed(ActionEvent event)
419 ActionListener[] listeners = getActionListeners();
421 for (int i = 0; i < listeners.length; i++)
422 listeners [ i ].actionPerformed(event);
426 * Fire the action event, named "Timer" and having the numeric
427 * identifier, equal to the numer of events that have been
428 * already fired before.
430 void fireActionPerformed()
432 fireActionPerformed(new ActionEvent(this, ticks++, "Timer"));
436 * Fire the queued action events.
437 * In the coalescing mode, a single event is fired as a replacement
438 * for all queued events. In non coalescing mode, a series of
439 * all queued events is fired.
440 * This is package-private to avoid an accessor method.
444 synchronized (queueLock)
449 fireActionPerformed();
455 fireActionPerformed();
464 * Post a scheduled event to the event queue.
465 * Package-private to avoid an accessor method.
469 synchronized(queueLock)
473 SwingUtilities.invokeLater(drainer);