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/*******************************************************************************
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* Copyright (c) 2005, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.draw2d;
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import org.eclipse.draw2d.geometry.Rectangle;
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import org.eclipse.swt.widgets.Control;
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/**
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* A graphics source that posts a paint request to the control rather than
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* constructing GC on it directly. This allows the OS's native painting
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* mechanism to be used directly, including any double-buffering that the OS may
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* provide for free.
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*
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* @since 3.2
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*/
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public final class NativeGraphicsSource implements GraphicsSource {
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private final Control canvas;
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/**
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* Constructs a new graphics source on the given control.
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*
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* @param canvas
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* the control
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* @since 3.2
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*/
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public NativeGraphicsSource(Control canvas) {
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this.canvas = canvas;
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}
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/**
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* Always returns <code>null</code>, because
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*
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* @see GraphicsSource#getGraphics(Rectangle)
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*/
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public Graphics getGraphics(Rectangle r) {
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canvas.redraw(r.x, r.y, r.width, r.height, false);
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canvas.update();
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return null;
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}
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/**
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* Does nothing.
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*
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* @see GraphicsSource#flushGraphics(Rectangle)
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*/
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public void flushGraphics(Rectangle region) {
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}
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}
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