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annotate dwtx/draw2d/NativeGraphicsSource.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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1 /*******************************************************************************
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2 * Copyright (c) 2005 IBM Corporation and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * IBM Corporation - initial API and implementation
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10 * Port to the D programming language:
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11 * Frank Benoit <benoit@tionex.de>
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12 *******************************************************************************/
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13
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14 module dwtx.draw2d.NativeGraphicsSource;
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16 import dwt.dwthelper.utils;
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17
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19
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20 import dwt.widgets.Control;
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21 import dwtx.draw2d.geometry.Rectangle;
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22 import dwtx.draw2d.GraphicsSource;
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23 import dwtx.draw2d.Graphics;
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24
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25 /**
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26 * A graphics source that posts a paint request to the control rather than constructing GC
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27 * on it directly. This allows the OS's native painting mechanism to be used directly,
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28 * including any double-buffering that the OS may provide for free.
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29 * @since 3.2
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30 */
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31 public final class NativeGraphicsSource : GraphicsSource {
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32
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33 private final Control canvas;
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34
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35 /**
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36 * Constructs a new graphics source on the given control.
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37 * @param canvas the control
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38 * @since 3.2
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39 */
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40 public this(Control canvas) {
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41 this.canvas = canvas;
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42 }
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43
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44 /**
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45 * Always returns <code>null</code>, because
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46 * @see GraphicsSource#getGraphics(Rectangle)
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47 */
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48 public Graphics getGraphics(Rectangle r) {
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49 canvas.redraw(r.x, r.y, r.width, r.height, false);
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50 canvas.update();
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51 return null;
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52 }
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53
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54 /**
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55 * Does nothing.
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56 * @see GraphicsSource#flushGraphics(Rectangle)
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57 */
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58 public void flushGraphics(Rectangle region) { }
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59
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60 }