SWT Shell : create a non-rectangular window


/*
 * Shell example snippet: create a non-rectangular window
 *
 * 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.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.graphics.Region;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;

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;

      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() {
      public void handleEvent(Event e) {
        shell.close();
      }
    });
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    region.dispose();
    display.dispose();
  }
}

1.	Create a non-rectangular shell to simulate transparency
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

SWT Shell : create a non-rectangular window : Shell Display « SWT JFace Eclipse « Java

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