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 synchronized void startModal() {


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


                    if (event instanceof MouseEvent) {
                        MouseEvent e = (MouseEvent) event;

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        // If the eventQueue can't be retrieved, the thread gets interrupted,
        // or the thread isn't a instanceof EventDispatchThread then return
        // a null as we won't be able to trap events.
        try {
            if (EventQueue.isDispatchThread()) {
                EventQueue eq = null;
                
                // Find the eventQueue. If we can't get to it then just return
                // null since we won't be able to trap any events.
                
                try {
                    eq = Toolkit.getDefaultToolkit().getSystemEventQueue();
                } catch (Exception ee) {
                    debug(ee);
                }
                
                // Safe guard
                if (eq == null) {
                    return null;
                }
                
                int eventNumber = -1;
                
                // Process the events until an object has been selected or
                // the context-sensitive search has been canceled.
                while (true) {
                    // This is essentially the body of EventDispatchThread
                    // modified to trap context-senstive events and act
                    // appropriately
                    eventNumber++;
                    AWTEvent event = eq.getNextEvent();
                    Object src = event.getSource();
                    // can't call eq.dispatchEvent
                    // so I pasted it's body here
                    
                    // debug(event);

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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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        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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    public void play(ComponentFinder resolver) {
        logger.info("Trying to close the window...: isShowing = " + window.isShowing() + " isVisible: " + window.isVisible() + " isValid: " + window.isValid());
        if (!window.isShowing() || !window.isVisible())
            return;
        EventQueue eventQueue = window.getToolkit().getSystemEventQueue();
        eventQueue.postEvent(new WindowEvent(window, WindowEvent.WINDOW_CLOSING));
    }

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    }


    private void click(int modifiers) {
        Point p = dialog.getButton().getLocationOnScreen();
        SwingUtilities.convertPointFromScreen(p, dialog);
        EventQueue systemEventQueue = Toolkit.getDefaultToolkit().getSystemEventQueue();
        MouseEvent theEvent = new MouseEvent(dialog, MouseEvent.MOUSE_PRESSED, System.currentTimeMillis(), modifiers, p.x, p.y, 1,
                false);
        systemEventQueue.postEvent(theEvent);
        AWTSync.sync();
    }

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    private void type(int keyCode, int modifiers) {
        KeyEvent event = new KeyEvent(dialog, KeyEvent.KEY_PRESSED, System.currentTimeMillis(), modifiers, keyCode, (char) 0);
        Point p = dialog.getButton().getLocationOnScreen();
        SwingUtilities.convertPointFromScreen(p, dialog);
        EventQueue systemEventQueue = Toolkit.getDefaultToolkit().getSystemEventQueue();
        // systemEventQueue.postEvent(new MouseEvent(dialog,
        // MouseEvent.MOUSE_MOVED, System.currentTimeMillis(),
        // modifiers, p.x, p.y, 1, false));
        systemEventQueue.postEvent(event);
        AWTSync.sync();
    }

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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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         * This is a BIG TIME HACK (that seems to work!) to work around the problem of 
         * popupMenuCanceled() not being called.
         * @return boolean
         */
        private boolean isPopupCanceled() {
            EventQueue queue = Toolkit.getDefaultToolkit().getSystemEventQueue();
            AWTEvent event = queue.peekEvent();
            
            if (event == null) {
                return true;
            } else {
                if (event instanceof InvocationEvent) {

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