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java.awt
Class EventQueue  

java.lang.Object
  java.awt.EventQueue

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public class EventQueue

extends java.lang.Object

This class manages a queue of AWTEvent objects that are posted to it. The AWT system uses only one event queue for all events.

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Field Summary
private  AWTEvent	currentEvent
private  EventDispatchThread	dispatchThread
private static int	INITIAL_QUEUE_DEPTH
private  long	lastWhen
private  EventQueue	next
private  int	next_in
private  int	next_out
private  EventQueue	prev
private  AWTEvent[]	queue
private  boolean	shutdown

 

Constructor Summary

EventQueue()           Initializes a new instance of EventQueue.

 

Method Summary
protected  void	dispatchEvent(AWTEvent evt)           Dispatches an event.
static AWTEvent	getCurrentEvent()           Return the event currently being dispatched by the event dispatch thread.
static long	getMostRecentEventTime()           Returns the timestamp of the most recent event that had a timestamp, or the initialization time of the event queue if no events have been fired.
AWTEvent	getNextEvent()           Returns the next event in the queue.
static void	invokeAndWait(java.lang.Runnable runnable)           Causes runnable to have its run method called in the dispatch thread of the EventQueue.
static void	invokeLater(java.lang.Runnable runnable)           This arranges for runnable to have its run method called in the dispatch thread of the EventQueue.
static boolean	isDispatchThread()           Return true if the current thread is the current AWT event dispatch thread.
(package private)  boolean	isShutdown()
AWTEvent	peekEvent()           Returns the next event in the queue without removing it from the queue.
AWTEvent	peekEvent(int id)           Returns the next event in the queue that has the specified id without removing it from the queue.
protected  void	pop()           Transfer any pending events from this queue back to the parent queue that was previously push()ed.
void	postEvent(AWTEvent evt)           Posts a new event to the queue.
void	push(EventQueue newEventQueue)           Allows a custom EventQueue implementation to replace this one.
private  void	setShutdown(boolean b)

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Field Detail

INITIAL_QUEUE_DEPTH

private static final int INITIAL_QUEUE_DEPTH

See Also:

Constant Field Values

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queue

private AWTEvent[] queue

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next_in

private int next_in

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next_out

private int next_out

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next

private EventQueue next

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prev

private EventQueue prev

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currentEvent

private AWTEvent currentEvent

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lastWhen

private long lastWhen

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dispatchThread

private EventDispatchThread dispatchThread

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shutdown

private boolean shutdown

Constructor Detail

EventQueue

public EventQueue()

Initializes a new instance of EventQueue.

Method Detail

setShutdown

private void setShutdown(boolean b)

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isShutdown

boolean isShutdown()

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getNextEvent

public AWTEvent getNextEvent()
                      throws java.lang.InterruptedException

Returns the next event in the queue. This method will block until an event is available or until the thread is interrupted.

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peekEvent

public AWTEvent peekEvent()

Returns the next event in the queue without removing it from the queue. This method will block until an event is available or until the thread is interrupted.

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peekEvent

public AWTEvent peekEvent(int id)

Returns the next event in the queue that has the specified id without removing it from the queue. This method will block until an event is available or until the thread is interrupted.

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postEvent

public void postEvent(AWTEvent evt)

Posts a new event to the queue.

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invokeAndWait

public static void invokeAndWait(java.lang.Runnable runnable)
                          throws java.lang.InterruptedException,
                                 java.lang.reflect.InvocationTargetException

Causes runnable to have its run method called in the dispatch thread of the EventQueue. This will happen after all pending events are processed. The call blocks until this has happened. This method will throw an Error if called from the event dispatcher thread.

Since:

1.2

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invokeLater

public static void invokeLater(java.lang.Runnable runnable)

This arranges for runnable to have its run method called in the dispatch thread of the EventQueue. This will happen after all pending events are processed.

Since:

1.2

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isDispatchThread

public static boolean isDispatchThread()

Return true if the current thread is the current AWT event dispatch thread.

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getCurrentEvent

public static AWTEvent getCurrentEvent()

Return the event currently being dispatched by the event dispatch thread. If the current thread is not the event dispatch thread, this method returns null.

Since:

1.4

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push

public void push(EventQueue newEventQueue)

Allows a custom EventQueue implementation to replace this one. All pending events are transferred to the new queue. Calls to postEvent, getNextEvent, and peekEvent and others are forwarded to the pushed queue until it is removed with a pop().

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pop

protected void pop()
            throws java.util.EmptyStackException

Transfer any pending events from this queue back to the parent queue that was previously push()ed. Event dispatch from this queue is suspended.

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dispatchEvent

protected void dispatchEvent(AWTEvent evt)

Dispatches an event. The manner in which the event is dispatched depends upon the type of the event and the type of the event's source object.

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getMostRecentEventTime

public static long getMostRecentEventTime()

Returns the timestamp of the most recent event that had a timestamp, or the initialization time of the event queue if no events have been fired. At present, only InputEvents, ActionEvents, InputMethodEvents, and InvocationEvents have timestamps, but this may be added to other events in future versions. If this is called by the event dispatching thread, it can be any (sequential) value, but to other threads, the safest bet is to return System.currentTimeMillis().

Since:

1.4

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> java >> [ awt overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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