Examples of java.awt.EventQueue

java.awt.EventQueue
EventQueue is a platform-independent class that queues events, both from the underlying peer classes and from trusted application classes.
It encapsulates asynchronous event dispatch machinery which extracts events from the queue and dispatches them by calling {@link #dispatchEvent(AWTEvent) dispatchEvent(AWTEvent)} methodon this EventQueue with the event to be dispatched as an argument. The particular behavior of this machinery is implementation-dependent. The only requirements are that events which were actually enqueued to this queue (note that events being posted to the EventQueue can be coalesced) are dispatched:

Sequentially.
That is, it is not permitted that several events from this queue are dispatched simultaneously.
In the same order as they are enqueued.
That is, if AWTEvent A is enqueued to the EventQueue before AWTEvent B then event B will not be dispatched before event A.

Some browsers partition applets in different code bases into separate contexts, and establish walls between these contexts. In such a scenario, there will be one EventQueue per context. Other browsers place all applets into the same context, implying that there will be only a single, global EventQueue for all applets. This behavior is implementation-dependent. Consult your browser's documentation for more information.
For information on the threading issues of the event dispatch machinery, see AWT Threading Issues. @author Thomas Ball @author Fred Ecks @author David Mendenhall @version 1.105, 07/11/06 @since 1.1

         */
        private void forwardMouseEvent(Component parent, MouseEvent e) {


            popupShouldShow = false;
            
            EventQueue queue = Toolkit.getDefaultToolkit().getSystemEventQueue();
            Point newLocation = SwingUtilities.convertPoint((Component) e.getSource(), e.getPoint(), parent);
            Component newSource = parent.getComponentAt(newLocation);


            if (newSource == null) {
                // Happens if you click on the border of a component.
                return;
            }


            newLocation = SwingUtilities.convertPoint(parent, newLocation, newSource);
            
            queue.postEvent(new MouseEvent(newSource,
                    e.getID(),
                    System.currentTimeMillis(),
                    e.getModifiers(),
                    newLocation.x,
                    newLocation.y,

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    private synchronized void startModal() {


        try {
            if (SwingUtilities.isEventDispatchThread()) {
                EventQueue theQueue = getToolkit().getSystemEventQueue();
                while (isVisible()) {
                    AWTEvent event = theQueue.getNextEvent();
                    Object source = event.getSource();
                    boolean dispatch = true;


                    if (event.getSource() != null && event.getSource() instanceof TrayIcon) {
                        return;

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    /**
     * Processes the next GUI event.
     */
    public void dispatchNextGuiEvent() throws InterruptedException {
        EventQueue queue = awtEventQueue;
        if (queue == null) {
            queue = Toolkit.getDefaultToolkit().getSystemEventQueue();
            awtEventQueue = queue;
        }
        AWTEvent event = queue.getNextEvent();
        if (event instanceof ActiveEvent) {
            ((ActiveEvent)event).dispatch();
        } else {
            Object source = event.getSource();
            if (source instanceof Component) {

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    /**
     * Processes the next GUI event.
     */
    public void dispatchNextGuiEvent() throws InterruptedException {
        EventQueue queue = awtEventQueue;
        if (queue == null) {
            queue = Toolkit.getDefaultToolkit().getSystemEventQueue();
            awtEventQueue = queue;
        }
        AWTEvent event = queue.getNextEvent();
        if (event instanceof ActiveEvent) {
            ((ActiveEvent)event).dispatch();
        } else {
            Object source = event.getSource();
            if (source instanceof Component) {

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    lp.add(modalInterceptor);
    f.toFront();


    // We need to explicitly dispatch events when we are blocking the event
    // dispatch thread.
    EventQueue queue = Toolkit.getDefaultToolkit().getSystemEventQueue();
    try
      {
        while (! f.isClosed())
          {
            if (EventQueue.isDispatchThread())
              {
                // The getNextEventMethod() issues wait() when no
                // event is available, so we don't need do explicitly wait().
                AWTEvent ev = queue.getNextEvent();
                // This mimics EventQueue.dispatchEvent(). We can't use
                // EventQueue.dispatchEvent() directly, because it is
                // protected, unfortunately.
                if (ev instanceof ActiveEvent)
                  ((ActiveEvent) ev).dispatch();

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  public static MainQtThread guiThread = null;
  public static QtGraphicsEnvironment graphicsEnv = null;


  private static void initToolkit()
  {
    eventQueue = new EventQueue();
    repaintThread = new QtRepaintThread();
    System.loadLibrary("qtpeer");


    String theme = null;
    try

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        public PostShutdownEventRunnable(AppContext ac) {
            appContext = ac;
        }


        public void run() {
            final EventQueue eq = (EventQueue)appContext.get(EVENT_QUEUE_KEY);
            if (eq != null) {
                eq.postEvent(AWTAutoShutdown.getShutdownEvent());
            }
        }

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    hotkeyActionMap.put(KeyStroke.getKeyStroke(KeyEvent.VK_TAB,
        mask),
        machineControlsPanel.showHideJogControlsWindowAction);


    Toolkit.getDefaultToolkit().getSystemEventQueue()
        .push(new EventQueue() {
          @Override
          protected void dispatchEvent(AWTEvent event) {
            if (event instanceof KeyEvent) {
              KeyStroke ks = KeyStroke
                  .getKeyStrokeForEvent((KeyEvent) event);

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        public PostShutdownEventRunnable(AppContext ac) {
            appContext = ac;
        }


        public void run() {
            final EventQueue eq = (EventQueue)appContext.get(EVENT_QUEUE_KEY);
            if (eq != null) {
                eq.postEvent(AWTAutoShutdown.getShutdownEvent());
            }
        }

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                    // The native side is currently waiting, so we set a timeout and do some pumping.
                    SWTNativeInterface.getInstance().getDisplay().readAndDispatch();
                  } else {
                    // On Mac OS, under rare circumstances, we have a situation where SWT is waiting synchronously on AWT, while AWT is blocked here.
                    // We have to use a similar forced dispatching trick.
                    EventQueue eventQueue = Toolkit.getDefaultToolkit().getSystemEventQueue();
                    AWTEvent nextEvent = eventQueue.peekEvent();
                    if(nextEvent != null) {
                      nextEvent = eventQueue.getNextEvent();
                      if(nextEvent != null) {
                        Method dispatchMethod = EventQueue.class.getDeclaredMethod("dispatchEvent", AWTEvent.class);
                        dispatchMethod.setAccessible(true);
                        dispatchMethod.invoke(eventQueue, nextEvent);
                      }

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