Adding a listener to the Shell for SWT.MouseUp doesn't work

Question

Hi all,

I attached a listener to the Shell on SWT.MouseUp and SWT.MouseDown events, but the handleEvent method never gets fired. I tried clicking at many places on the window, but it doesn't get even to the System.out.println(..) in the code below...

Do you spot any error here?

Thank you!

//c is a Composite.

final Listener l = new Listener(){
public void handleEvent(Event event) {
System.out.println("Got event. "+event);
Rectangle rect = c.getBounds();
if (rect.contains(event.x, event.y)){
 if((Boolean)c.getData("selected")){
  c.setData("selected", Boolean.FALSE);
 }else{
  c.setData("selected", Boolean.TRUE);
 }
}
}
};
c.getShell().addListener(SWT.MouseUp, l);
c.getShell().addListener(SWT.MouseDown, l);

(This composite is inside an Eclipse editor that uses the Forms Toolkit)

Regards,

-Pradyumna

Answer 1

By writing

c.getShell().addListener(SWT.MouseUp, l);
c.getShell().addListener(SWT.MouseDown, l);

you add the listeners to the shell only! Clicking on a child of the shell does not trigger an event for c.getShell(). Try to click near the border of the window and watch out for your trace message.

If you want to get events for the clicks on c, you have to add listeners to c via c.addListener(.). If you do that, you won't need the condition rect.contains(event.x, event.y) because you know, that the click happened on c.