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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2007 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 * D Port:
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11 * Bill Baxter <wbaxter> at gmail com
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12 *******************************************************************************/
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13 module org.eclipse.swt.snippets.Snippet275;
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14
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15 /*
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16 * Canvas snippet: update a portion of a Canvas frequently
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17 *
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18 * For a list of all SWT example snippets see
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19 * http://www.eclipse.org/swt/snippets/
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20 */
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21 import org.eclipse.swt.SWT;
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22 import org.eclipse.swt.graphics.GC;
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23 import org.eclipse.swt.graphics.Color;
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24 import org.eclipse.swt.graphics.Point;
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25 import org.eclipse.swt.graphics.Image;
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26 import org.eclipse.swt.widgets.Display;
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27 import org.eclipse.swt.widgets.Shell;
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28 import org.eclipse.swt.widgets.Event;
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29 import org.eclipse.swt.widgets.Listener;
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30 import org.eclipse.swt.widgets.Canvas;
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31
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32 import java.lang.all;
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33
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34 import tango.util.Convert;
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35
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36 static String value;
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37 public static void main () {
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38 final int INTERVAL = 888;
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39 final Display display = new Display ();
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40 final Image image = new Image (display, 750, 750);
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41 GC gc = new GC (image);
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42 gc.setBackground (display.getSystemColor (SWT.COLOR_RED));
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43 gc.fillRectangle (image.getBounds ());
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44 gc.dispose ();
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45
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46 Shell shell = new Shell (display);
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47 shell.setBounds (10, 10, 790, 790);
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48 final Canvas canvas = new Canvas (shell, SWT.NONE);
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49 canvas.setBounds (10, 10, 750, 750);
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50
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51 void onPaint (Event event) {
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52 value = to!(char[])(System.currentTimeMillis ());
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53 event.gc.drawImage (image, 0, 0);
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54 event.gc.drawString (value, 10, 10, true);
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55 }
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56 canvas.addListener (SWT.Paint, dgListener(&onPaint));
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57
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58 display.timerExec (INTERVAL, new class Runnable {
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59 void run () {
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60 if (canvas.isDisposed ()) return;
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61 // canvas.redraw (); // <-- bad, damages more than is needed
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62 GC gc = new GC (canvas);
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63 Point extent = gc.stringExtent (value ~ '0');
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64 gc.dispose ();
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65 canvas.redraw (10, 10, extent.x, extent.y, false);
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66 display.timerExec (INTERVAL, this);
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67 }
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68 });
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69 shell.open ();
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70 while (!shell.isDisposed ()){
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71 if (!display.readAndDispatch ()) display.sleep ();
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72 }
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73 image.dispose ();
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74 display.dispose ();
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75 }
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