Create a non-rectangular shell to simulate transparency


/*
 * 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();
  }
}

1.	SWT Shell : create a non-rectangular window
2.	Open a shell maximized (full screen)
3.	Open a shell minimized (iconified)
4.	Non Rectangular Window in SWT
5.	Widget Test
6.	HelloWorld Display
7.	Ring Shell
8.	Shell Style
9.	Shows the various styles of Decorations
10.	Child Shell Example
11.	Child Shell Example 2
12.	Child Shell Example 3
13.	Shell Styles Example
14.	Professional Shell
15.	Complex Shell Example
16.	Composite Shell Example 2
17.	SWT Composite Class
18.	Simplest SWT
19.	Prevent a shell from closing (prompt the user)
20.	Create a splash screen in SWT
21.	Display example snippet: get the bounds and client area of a display
22.	Display: stop a repeating timer when a button is pressed
23.	Create one repeating timer (every 500 ms)
24.	Create two one shot timers (5000 ms, 2000 ms)
25.	Create and dispose children of a composite

Create a non-rectangular shell to simulate transparency : Shell Display « SWT JFace Eclipse « Java

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