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


  /**
   * Initialize the event queue
   */
  public static void initializeEventQueue() {
    EventQueue waitQueue = new WaitCursorEventQueue(500);
    Toolkit.getDefaultToolkit().getSystemEventQueue().push(waitQueue);
  }

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 * @author Alex Ruiz
 */
public class WindowMonitor_eventQueueFor_Test extends WindowMonitor_TestCase {
  @Test
  public void should_return_EventQueue_for_Component() {
    EventQueue queue = new EventQueue();
    when(context.eventQueueFor(frame)).thenReturn(queue);
    assertThat(monitor.eventQueueFor(frame)).isSameAs(queue);
  }

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public class ToolkitStub extends Toolkit {
  private Map<AWTEventListener, Long> eventListeners;
  private EventQueue eventQueue;


  static ToolkitStub createNew() {
    return createNew(new EventQueue());
  }

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  TestWindow window;
  Context context;


  @Before
  public final void setUp() {
    eventQueue = new EventQueue();
    toolkit = newToolkitStub(eventQueue);
    window = TestWindow.createNewWindow(getClass());
    windowEventQueueMapping = mock(WindowEventQueueMapping.class);
    eventQueueMapping = mock(EventQueueMapping.class);
    createContext();

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    assertThat(windowMapping).isEmpty();
  }


  @Test
  public void should_remove_Component_from_all_mappings() {
    EventQueue anotherEventQueue = new EventQueue();
    Map<Window, Boolean> windowMapping = newHashMap();
    windowMapping.put(window, true);
    queueMap.put(anotherEventQueue, windowMapping);
    mapping.removeMappingFor(window);
    assertThat(windowMapping).isEmpty();

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 */
public class EventQueueMapping_queueFor_Test extends EventQueueMapping_TestCase {
  @Test
  public void should_return_EventQueue() {
    mapping.addQueueFor(component);
    EventQueue storedEventQueue = mapping.queueFor(component);
    assertThat(storedEventQueue).isSameAs(eventQueue);
  }

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  }


  @Test
  public void should_return_EventQueue_in_Component_if_no_mapping_found() {
    assertThat(queueMap.keySet()).excludes(eventQueue);
    EventQueue storedEventQueue = mapping.queueFor(component);
    assertThat(storedEventQueue).isSameAs(eventQueue);
  }

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 */
public class Context_storedQueueFor_Test extends Context_TestCase {
  @Test
  public void should_return_stored_queue() {
    when(eventQueueMapping.storedQueueFor(window)).thenReturn(eventQueue);
    EventQueue storedQueue = context.storedQueueFor(window);
    assertThat(storedQueue).isSameAs(eventQueue);
  }

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 * @author Alex Ruiz
 */
public class WindowEventQueueMapping_eventQueues_Test extends WindowEventQueueMapping_withWindow_TestCase {
  @Test
  public void should_return_EventQueues() {
    EventQueue anotherEventQueue = new EventQueue();
    ToolkitStub anotherToolkit = newToolkitStub(anotherEventQueue);
    MyWindow anotherWindow = MyWindow.createNew(anotherToolkit, getClass());
    mapping.addQueueFor(window);
    mapping.addQueueFor(anotherWindow);
    Collection<EventQueue> eventQueues = mapping.eventQueues();

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 * @author Alex Ruiz
 */
public class EventQueueMapping_eventQueues_Test extends EventQueueMapping_TestCase {
  @Test
  public void should_return_all_EventQueues() {
    EventQueue anotherEventQueue = new EventQueue();
    ToolkitStub anotherToolkit = newToolkitStub(anotherEventQueue);
    ComponentWithCustomEventQueue anotherComponent = new ComponentWithCustomEventQueue(anotherToolkit);
    mapping.addQueueFor(component);
    mapping.addQueueFor(anotherComponent);
    Collection<EventQueue> allEventQueues = mapping.eventQueues();

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