/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.snippets;
/*
* Shell example snippet: create a non-rectangular window
*
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
*
* @since 3.0
*/
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
public class Snippet134 {
static int[] circle(int r, int offsetX, int offsetY) {
int[] polygon = new int[8 * r + 4];
//x^2 + y^2 = r^2
for (int i = 0; i < 2 * r + 1; i++) {
int x = i - r;
int y = (int)Math.sqrt(r*r - x*x);
polygon[2*i] = offsetX + x;
polygon[2*i+1] = offsetY + y;
polygon[8*r - 2*i - 2] = offsetX + x;
polygon[8*r - 2*i - 1] = offsetY - y;
}
return polygon;
}
public static void main(String[] args) {
final Display display = new Display();
//Shell must be created with style SWT.NO_TRIM
final Shell shell = new Shell(display, SWT.NO_TRIM | SWT.ON_TOP);
shell.setBackground(display.getSystemColor(SWT.COLOR_RED));
//define a region that looks like a key hole
Region region = new Region();
region.add(circle(67, 67, 67));
region.subtract(circle(20, 67, 50));
region.subtract(new int[]{67, 50, 55, 105, 79, 105});
//define the shape of the shell using setRegion
shell.setRegion(region);
Rectangle size = region.getBounds();
shell.setSize(size.width, size.height);
//add ability to move shell around
Listener l = new Listener() {
Point origin;
@Override
public void handleEvent(Event e) {
switch (e.type) {
case SWT.MouseDown:
origin = new Point(e.x, e.y);
break;
case SWT.MouseUp:
origin = null;
break;
case SWT.MouseMove:
if (origin != null) {
Point p = display.map(shell, null, e.x, e.y);
shell.setLocation(p.x - origin.x, p.y - origin.y);
}
break;
}
}
};
shell.addListener(SWT.MouseDown, l);
shell.addListener(SWT.MouseUp, l);
shell.addListener(SWT.MouseMove, l);
//add ability to close shell
Button b = new Button(shell, SWT.PUSH);
b.setBackground(shell.getBackground());
b.setText("close");
b.pack();
b.setLocation(10, 68);
b.addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event e) {
shell.close();
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
region.dispose();
display.dispose();
}
}