Entry

Is it possible to prevent the mouse from exiting a window and how ?

Oct 27th, 2004 23:03
Tom McGuire, Vane Trajkov,

You could try this nasty bit of coding, however my gut tells me that 
99% of the time, what you are trying to do is bad design.

public class TrapPanel extends JPanel{

   private Point lastMousePosition;
   private Robot robot;
   public TrapPanel(){
      super(null);
      try{
         robot = new Robot();
      }catch(AWTException awt){
         System.err.println("Robot not available");
      }
      addMouseListener(new MouseAdapter() {
         public void mouseExited(MouseEvent e) {
            if(robot!=null){
               Point p = getLocation();
               p.translate(lastMousePosition.x,lastMousePosition.y);
               SwingUtilities.convertPointToScreen(p,e.getComponent());
               robot.mouseMove(p.x,p.y);
            }
         }
      });
		
      addMouseMotionListener(new MouseMotionListener() {
         public void mouseDragged(MouseEvent e) {
            lastMousePosition = e.getPoint();
         }

         public void mouseMoved(MouseEvent e) {
            lastMousePosition = e.getPoint();
         }
      });
   }
}