org.eclipse.swt.snippets.Snippet294 source code

1 #!/usr/bin/env dub
2 /+
3 dub.sdl:
4     name "snippet294"
5     dependency "dwt" path="../../../../../../"
6     libs \
7       "atk-1.0" \
8       "cairo" \
9       "dl" \
10       "fontconfig" \
11       "gdk-x11-2.0" \
12       "gdk_pixbuf-2.0" \
13       "glib-2.0" \
14       "gmodule-2.0" \
15       "gnomeui-2" \
16       "gnomevfs-2" \
17       "gobject-2.0" \
18       "gthread-2.0" \
19       "gtk-x11-2.0" \
20       "pango-1.0" \
21       "pangocairo-1.0" \
22       "X11" \
23       "Xcomposite" \
24       "Xcursor" \
25       "Xdamage" \
26       "Xext" \
27       "Xfixes" \
28       "Xi" \
29       "Xinerama" \
30       "Xrandr" \
31       "Xrender" \
32       "Xtst" \
33       platform="linux"
34 +/
35 
36 /*******************************************************************************
37  * Copyright (c) 2000, 2008 IBM Corporation and others.
38  * All rights reserved. This program and the accompanying materials
39  * are made available under the terms of the Eclipse Public License v1.0
40  * which accompanies this distribution, and is available at
41  * http://www.eclipse.org/legal/epl-v10.html
42  *
43  * Contributors:
44  *     IBM Corporation - initial API and implementation
45  * D Port:
46  *     Thomas Demmer <t_demmer AT web DOT de>
47  *******************************************************************************/
48 module org.eclipse.swt.snippets.Snippet294;
49 
50 /*
51  * Region on a control: create a non-rectangular button
52  *
53  * For a list of all SWT example snippets see
54  * http://www.eclipse.org/swt/snippets/
55  *
56  * @since 3.4
57  */
58 import org.eclipse.swt.SWT;
59 import org.eclipse.swt.graphics.Image;
60 import org.eclipse.swt.graphics.Region;
61 import org.eclipse.swt.layout.FillLayout;
62 import org.eclipse.swt.widgets.Button;
63 import org.eclipse.swt.widgets.Display;
64 import org.eclipse.swt.widgets.Event;
65 import org.eclipse.swt.widgets.Listener;
66 import org.eclipse.swt.widgets.Shell;
67 
68 import java.lang.all;
69 version(Tango){
70     import tango.util.Convert;
71 } else { // Phobos
72     import std.conv;
73 }
74 
75 int[] circle(int r, int offsetX, int offsetY) {
76     int[] polygon = new int[8 * r + 4];
77     // x^2 + y^2 = r^2
78     for (int i = 0; i < 2 * r + 1; i++) {
79         int x = i - r;
80         int y = cast(int)Math.sqrt(cast(real)(r*r - x*x));
81         polygon[2*i] = offsetX + x;
82         polygon[2*i+1] = offsetY + y;
83         polygon[8*r - 2*i - 2] = offsetX + x;
84         polygon[8*r - 2*i - 1] = offsetY - y;
85     }
86     return polygon;
87 }
88 
89 void main() {
90     Display display = new Display();
91     Shell shell = new Shell(display);
92     shell.setText("Regions on a Control");
93     shell.setLayout(new FillLayout());
94     shell.setBackground(display.getSystemColor(SWT.COLOR_DARK_RED));
95 
96     Button b2 = new Button(shell, SWT.PUSH);
97     b2.setText("Button with Regions");
98 
99     // define a region that looks like a circle with two holes in ot
100     Region region = new Region();
101     region.add(circle(67, 87, 77));
102     region.subtract(circle(20, 87, 47));
103     region.subtract(circle(20, 87, 113));
104 
105     // define the shape of the button using setRegion
106     b2.setRegion(region);
107     b2.setLocation(100,50);
108 
109     b2.addListener(SWT.Selection, new class Listener {
110         public void handleEvent(Event e) {
111             shell.close();
112         }
113     });
114 
115     shell.setSize(200,200);
116     shell.open();
117 
118     while (!shell.isDisposed()) {
119         if (!display.readAndDispatch())
120             display.sleep();
121     }
122     region.dispose();
123     display.dispose();
124 }