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1 /*******************************************************************************
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2 * Copyright (c) 2000, 2008 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 * Thomas Demmer <t_demmer AT web DOT de>
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12 *******************************************************************************/
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13 module org.eclipse.swt.snippets.Snippet294;
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14
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15 /* Port OK */
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16 import org.eclipse.swt.SWT;
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17 import org.eclipse.swt.graphics.Image;
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18 import org.eclipse.swt.graphics.Region;
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19 import org.eclipse.swt.layout.FillLayout;
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20 import org.eclipse.swt.widgets.Button;
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21 import org.eclipse.swt.widgets.Display;
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22 import org.eclipse.swt.widgets.Event;
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23 import org.eclipse.swt.widgets.Listener;
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24 import org.eclipse.swt.widgets.Shell;
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25
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26 import java.lang.all;
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27 import tango.util.Convert;
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28
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29 void main(String[] args){
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30 Snippet294.main(args);
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31 }
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32
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33 /*
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34 * Region on a control: create a non-rectangular button
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35 *
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36 * For a list of all SWT example snippets see
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37 * http://www.eclipse.org/swt/snippets/
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38 *
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39 * @since 3.4
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40 */
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41
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42 public class Snippet294 {
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43
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44 static int[] circle(int r, int offsetX, int offsetY) {
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45 int[] polygon = new int[8 * r + 4];
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46 // x^2 + y^2 = r^2
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47 for (int i = 0; i < 2 * r + 1; i++) {
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48 int x = i - r;
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49 int y = cast(int)Math.sqrt(cast(real)(r*r - x*x));
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50 polygon[2*i] = offsetX + x;
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51 polygon[2*i+1] = offsetY + y;
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52 polygon[8*r - 2*i - 2] = offsetX + x;
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53 polygon[8*r - 2*i - 1] = offsetY - y;
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54 }
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55 return polygon;
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56 }
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57
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58 public static void main(String[] args) {
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59 Display display = new Display();
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60 Shell shell = new Shell(display);
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61 shell.setText("Regions on a Control");
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62 shell.setLayout(new FillLayout());
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63 shell.setBackground(display.getSystemColor(SWT.COLOR_DARK_RED));
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64
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65 Button b2 = new Button(shell, SWT.PUSH);
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66 b2.setText("Button with Regions");
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67
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68 // define a region that looks like a circle with two holes in ot
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69 Region region = new Region();
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70 region.add(circle(67, 87, 77));
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71 region.subtract(circle(20, 87, 47));
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72 region.subtract(circle(20, 87, 113));
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73
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74 // define the shape of the button using setRegion
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75 b2.setRegion(region);
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76 b2.setLocation(100,50);
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77
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78 b2.addListener(SWT.Selection, new class() Listener {
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79 public void handleEvent(Event e) {
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80 shell.close();
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81 }
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82 });
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83
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84 shell.setSize(200,200);
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85 shell.open();
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86
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87 while (!shell.isDisposed()) {
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88 if (!display.readAndDispatch())
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89 display.sleep();
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90 }
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91 region.dispose();
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92 display.dispose();
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93 }
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94 }
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