| /* |
| * Copyright (c) 2005, 2011, 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.Component; |
| import java.awt.Rectangle; |
| import java.awt.event.PaintEvent; |
| |
| /** |
| * PaintEventDispatcher is responsible for dispatching PaintEvents. There |
| * can be only one PaintEventDispatcher active at a particular time. |
| * |
| */ |
| public class PaintEventDispatcher { |
| /** |
| * Singleton dispatcher. |
| */ |
| private static PaintEventDispatcher dispatcher; |
| |
| /** |
| * Sets the current <code>PaintEventDispatcher</code>. |
| * |
| * @param dispatcher PaintEventDispatcher |
| */ |
| public static void setPaintEventDispatcher( |
| PaintEventDispatcher dispatcher) { |
| synchronized(PaintEventDispatcher.class) { |
| PaintEventDispatcher.dispatcher = dispatcher; |
| } |
| } |
| |
| /** |
| * Returns the currently active <code>PaintEventDispatcher</code>. This |
| * will never return null. |
| * |
| * @return PaintEventDispatcher |
| */ |
| public static PaintEventDispatcher getPaintEventDispatcher() { |
| synchronized(PaintEventDispatcher.class) { |
| if (dispatcher == null) { |
| dispatcher = new PaintEventDispatcher(); |
| } |
| return dispatcher; |
| } |
| } |
| |
| /** |
| * Creates and returns the <code>PaintEvent</code> that should be |
| * dispatched for the specified component. If this returns null |
| * no <code>PaintEvent</code> is dispatched. |
| * <p> |
| * <b>WARNING:</b> This is invoked from the native thread, be careful |
| * what methods you end up invoking here. |
| */ |
| public PaintEvent createPaintEvent(Component target, int x, int y, int w, |
| int h) { |
| |
| return new PaintEvent(target, PaintEvent.PAINT, |
| new Rectangle(x, y, w, h)); |
| } |
| |
| /** |
| * Returns true if a native background erase should be done for |
| * the specified Component. |
| */ |
| public boolean shouldDoNativeBackgroundErase(Component c) { |
| return true; |
| } |
| |
| /** |
| * This method is invoked from the toolkit thread when the surface |
| * data of the component needs to be replaced. The method run() of |
| * the Runnable argument performs surface data replacing, run() |
| * should be invoked on the EDT of this component's AppContext. |
| * Returns true if the Runnable has been enqueued to be invoked |
| * on the EDT. |
| * (Fix 6255371.) |
| */ |
| public boolean queueSurfaceDataReplacing(Component c, Runnable r) { |
| return false; |
| } |
| } |