jdk/src/share/classes/sun/awt/EventQueueDelegate.java
changeset 1293 ef349b440fc9
child 1294 16088ec1b9e7
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/awt/EventQueueDelegate.java	Fri Jul 25 14:13:59 2008 -0400
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  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.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.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);
+
+        /**
+         * 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);
+    }
+}