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105 lines
3.6 KiB
Java
105 lines
3.6 KiB
Java
/*
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* Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.awt;
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import java.awt.Component;
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import java.awt.Rectangle;
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import java.awt.event.PaintEvent;
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/**
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* PaintEventDispatcher is responsible for dispatching PaintEvents. There
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* can be only one PaintEventDispatcher active at a particular time.
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*
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*/
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public class PaintEventDispatcher {
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/**
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* Singleton dispatcher.
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*/
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private static PaintEventDispatcher dispatcher;
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/**
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* Sets the current {@code PaintEventDispatcher}.
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*
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* @param dispatcher PaintEventDispatcher
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*/
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public static void setPaintEventDispatcher(
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PaintEventDispatcher dispatcher) {
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synchronized(PaintEventDispatcher.class) {
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PaintEventDispatcher.dispatcher = dispatcher;
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}
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}
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/**
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* Returns the currently active {@code PaintEventDispatcher}. This
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* will never return null.
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*
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* @return PaintEventDispatcher
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*/
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public static PaintEventDispatcher getPaintEventDispatcher() {
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synchronized(PaintEventDispatcher.class) {
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if (dispatcher == null) {
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dispatcher = new PaintEventDispatcher();
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}
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return dispatcher;
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}
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}
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/**
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* Creates and returns the {@code PaintEvent} that should be
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* dispatched for the specified component. If this returns null
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* no {@code PaintEvent} is dispatched.
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* <p>
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* <b>WARNING:</b> This is invoked from the native thread, be careful
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* what methods you end up invoking here.
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*/
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public PaintEvent createPaintEvent(Component target, int x, int y, int w,
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int h) {
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return new PaintEvent(target, PaintEvent.PAINT,
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new Rectangle(x, y, w, h));
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}
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/**
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* Returns true if a native background erase should be done for
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* the specified Component.
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*/
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public boolean shouldDoNativeBackgroundErase(Component c) {
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return true;
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}
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/**
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* This method is invoked from the toolkit thread when the surface
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* data of the component needs to be replaced. The method run() of
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* the Runnable argument performs surface data replacing, run()
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* should be invoked on the EDT of this component's AppContext.
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* Returns true if the Runnable has been enqueued to be invoked
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* on the EDT.
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* (Fix 6255371.)
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*/
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public boolean queueSurfaceDataReplacing(Component c, Runnable r) {
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return false;
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}
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}
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