Source Code : Intercept mouse events (drag a button with the mouse)

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Intercept mouse events (drag a button with the mouse)

 
/*
 * Composite example snippet: intercept mouse events (drag a button with the mouse)
 *
 * 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.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
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 Snippet46 {
public static void main (String [] args) {
  Display display = new Display ();
  final Shell shell = new Shell (display);
  final Composite composite = new Composite (shell, SWT.NONE);
  composite.setEnabled (false);
  composite.setLayout (new FillLayout ());
  Button button = new Button (composite, SWT.PUSH);
  button.setText ("Button");
  composite.pack ();
  composite.setLocation (10, 10);
  final Point [] offset = new Point [1];
  Listener listener = new Listener () {
    public void handleEvent (Event event) {
      switch (event.type) {
        case SWT.MouseDown:
          Rectangle rect = composite.getBounds ();
          if (rect.contains (event.x, event.y)) {
            Point pt1 = composite.toDisplay (0, 0);
            Point pt2 = shell.toDisplay (event.x, event.y); 
            offset [0] = new Point (pt2.x - pt1.x, pt2.y - pt1.y);
          }
          break;
        case SWT.MouseMove:
          if (offset [0] != null) {
            Point pt = offset [0];
            composite.setLocation (event.x - pt.x, event.y - pt.y);
          }
          break;
        case SWT.MouseUp:
          offset [0] = null;
          break;
      }
    }
  };
  shell.addListener (SWT.MouseDown, listener);
  shell.addListener (SWT.MouseUp, listener);
  shell.addListener (SWT.MouseMove, listener);
  shell.setSize (300, 300);
  shell.open ();
  while (!shell.isDisposed ()) {
    if (!display.readAndDispatch ()) display.sleep ();
  }
  display.dispose ();
}
}

           
       

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