/*
* Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.awt;
import java.awt.AWTEvent;
import java.awt.EventQueue;
public class EventQueueDelegate {
private static final Object EVENT_QUEUE_DELEGATE_KEY =
new StringBuilder("EventQueueDelegate.Delegate");
public static void setDelegate(Delegate delegate) {
AppContext.getAppContext().put(EVENT_QUEUE_DELEGATE_KEY, delegate);
}
public static Delegate getDelegate() {
return
(Delegate) AppContext.getAppContext().get(EVENT_QUEUE_DELEGATE_KEY);
}
public interface Delegate {
/**
* This method allows for changing {@code EventQueue} events order.
*
* @param eventQueue current {@code EventQueue}
* @return next {@code event} for the {@code EventDispatchThread}
*/
public AWTEvent getNextEvent(EventQueue eventQueue) throws InterruptedException;
/**
* Notifies delegate before EventQueue.dispatch method.
*
* Note: this method may mutate the event
*
* @param event to be dispatched by {@code dispatch} method
* @return handle to be passed to {@code afterDispatch} method
*/
public Object beforeDispatch(AWTEvent event) throws InterruptedException;
/**
* Notifies delegate after EventQueue.dispatch method.
*
* @param event {@code event} dispatched by the {@code dispatch} method
* @param handle object which came from {@code beforeDispatch} method
*/
public void afterDispatch(AWTEvent event, Object handle) throws InterruptedException;
}
}