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Diffstat (limited to 'libjava/java/awt/EventQueue.java')
| -rw-r--r-- | libjava/java/awt/EventQueue.java | 258 |
1 files changed, 0 insertions, 258 deletions
diff --git a/libjava/java/awt/EventQueue.java b/libjava/java/awt/EventQueue.java deleted file mode 100644 index 6ba9cb64585..00000000000 --- a/libjava/java/awt/EventQueue.java +++ /dev/null @@ -1,258 +0,0 @@ -/* Copyright (C) 2000 Free Software Foundation - - This file is part of libgcj. - -This software is copyrighted work licensed under the terms of the -Libgcj License. Please consult the file "LIBGCJ_LICENSE" for -details. */ - -package java.awt; - -import java.awt.event.*; -import java.util.EmptyStackException; -import java.lang.reflect.InvocationTargetException; - -/* Written using on-line Java 2 Platform Standard Edition v1.3 API - * Specification, as well as "The Java Class Libraries", 2nd edition - * (Addison-Wesley, 1998). - * Status: Believed complete, but untested. Check FIXME's. - */ - -/** @author Bryce McKinlay */ - -public class EventQueue -{ - private static final int INITIAL_QUEUE_DEPTH = 8; - private AWTEvent[] queue = new AWTEvent[INITIAL_QUEUE_DEPTH]; - - private int next_in = 0; // Index where next event will be added to queue - private int next_out = 0; // Index of next event to be removed from queue - - private EventQueue next; - private EventQueue prev; - - private EventDispatchThread dispatchThread = new EventDispatchThread(this); - - public EventQueue() - { - } - - public synchronized AWTEvent getNextEvent() - throws InterruptedException - { - if (next != null) - return next.getNextEvent(); - - while (next_in == next_out) - wait(); - - AWTEvent res = queue[next_out]; - - if (++next_out == queue.length) - next_out = 0; - return res; - } - - /** @specnote Does not block. Returns null if there are no events on the - * queue. - */ - public synchronized AWTEvent peekEvent() - { - if (next != null) - return next.peekEvent(); - - if (next_in != next_out) - return queue[next_out]; - else return null; - } - - /** @specnote Does not block. Returns null if there are no matching events - * on the queue. - */ - public synchronized AWTEvent peekEvent(int id) - { - if (next != null) - return next.peekEvent(id); - - int i = next_out; - while (i != next_in) - { - AWTEvent qevt = queue[i]; - if (qevt.id == id) - return qevt; - } - return null; - } - - public synchronized void postEvent(AWTEvent evt) - { - if (next != null) - { - next.postEvent(evt); - return; - } - // FIXME: Security checks? - - /* Check for any events already on the queue with the same source - and ID. */ - int i = next_out; - while (i != next_in) - { - AWTEvent qevt = queue[i]; - Object src; - if (qevt.id == evt.id - && (src = qevt.getSource()) == evt.getSource() - && src instanceof Component) - { - /* If there are, call coalesceEvents on the source component - to see if they can be combined. */ - Component srccmp = (Component) src; - AWTEvent coalesced_evt = srccmp.coalesceEvents(qevt, evt); - if (coalesced_evt != null) - { - /* Yes. Replace the existing event with the combined event. */ - queue[i] = coalesced_evt; - return; - } - break; - } - if (++i == queue.length) - i = 0; - } - - queue[next_in] = evt; - if (++next_in == queue.length) - next_in = 0; - - if (next_in == next_out) - { - /* Queue is full. Extend it. */ - AWTEvent[] oldQueue = queue; - queue = new AWTEvent[queue.length * 2]; - - int len = oldQueue.length - next_out; - System.arraycopy(oldQueue, next_out, queue, 0, len); - if (next_out != 0) - System.arraycopy(oldQueue, 0, queue, len, next_out); - - next_out = 0; - next_in = oldQueue.length; - } - notify(); - } - - /** @since JDK1.2 */ - public static void invokeAndWait(Runnable runnable) - throws InterruptedException, InvocationTargetException - { - // FIXME: Is this an appropriate way to access the event queue? - EventQueue eq = Toolkit.systemEventQueue; - Thread current = Thread.currentThread(); - if (current == eq.dispatchThread) - throw new Error("Can't call invokeAndWait from event dispatch thread"); - - InvocationEvent ie = - new InvocationEvent(eq, runnable, current, true); - - synchronized (current) - { - eq.postEvent(ie); - current.wait(); - } - - Exception exception; - - if ((exception = ie.getException()) != null) - throw new InvocationTargetException(exception); - } - - /** @since JDK1.2 */ - static void invokeLater(Runnable runnable) - { - // FIXME: Is this an appropriate way to access the event queue? - EventQueue eq = Toolkit.systemEventQueue; - - InvocationEvent ie = - new InvocationEvent(eq, runnable, null, false); - - eq.postEvent(ie); - } - - static boolean isDispatchThread() - { - // FIXME: Is this an appropriate way to access the event queue? - EventQueue eq = Toolkit.systemEventQueue; - return (Thread.currentThread() == eq.dispatchThread); - } - - /** Allows a custom EventQueue implementation to replace this one. - * All pending events are transferred to the new queue. Calls to postEvent, - * getNextEvent, and peekEvent are forwarded to the pushed queue until it - * is removed with a pop(). - */ - public synchronized void push(EventQueue newEventQueue) - { - int i = next_out; - while (i != next_in) - { - newEventQueue.postEvent(queue[i]); - next_out = i; - if (++i == queue.length) - i = 0; - } - - next = newEventQueue; - newEventQueue.prev = this; - } - - /** Transfer any pending events from this queue back to the parent queue that - * was previously push()ed. Event dispatch from this queue is suspended. */ - protected void pop() throws EmptyStackException - { - if (prev == null) - throw new EmptyStackException(); - - // Don't synchronize both this and prev at the same time, or deadlock could - // occur. - synchronized (prev) - { - prev.next = null; - } - - synchronized (this) - { - int i = next_out; - while (i != next_in) - { - prev.postEvent(queue[i]); - next_out = i; - if (++i == queue.length) - i = 0; - } - } - } - - protected void dispatchEvent(AWTEvent evt) - { - if (evt instanceof ActiveEvent) - { - ActiveEvent active_evt = (ActiveEvent) evt; - active_evt.dispatch(); - } - else - { - Object source = evt.getSource(); - - if (source instanceof Component) - { - Component srccmp = (Component) source; - srccmp.dispatchEvent(evt); - } - else if (source instanceof MenuComponent) - { - MenuComponent srccmp = (MenuComponent) source; - srccmp.dispatchEvent(evt); - } - } - } -} |