Mega Code Archive
Create a non-rectangular shell to simulate transparency
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/*
* Create a non-rectangular shell to simulate transparency
*
* For a list of all SWT example snippets see
* http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
*/
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class Snippet180 {
public static void main(String[] args) {
Display display = new Display();
final Image image = display.getSystemImage(SWT.ICON_WARNING);
// 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
Region region = new Region();
Rectangle pixel = new Rectangle(0, 0, 1, 1);
for (int y = 0; y < 200; y += 2) {
for (int x = 0; x < 200; x += 2) {
pixel.x = x;
pixel.y = y;
region.add(pixel);
}
}
// define the shape of the shell using setRegion
shell.setRegion(region);
Rectangle size = region.getBounds();
shell.setSize(size.width, size.height);
shell.addPaintListener(new PaintListener() {
public void paintControl(PaintEvent e) {
Rectangle bounds = image.getBounds();
Point size = shell.getSize();
e.gc.drawImage(image, 0, 0, bounds.width, bounds.height, 10,
10, size.x - 20, size.y - 20);
}
});
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
region.dispose();
display.dispose();
}
}
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