🚀 go-pugleaf

Gary McGath wrote:

> I don't think that's what he was asking. Windows aren't linked by getParent().
> 

Actually, I think Windows *are* linked by getParent(). In fact, I was
about to leave a message about that. I've got a situation where a mouse 
click on a "Close" button needs to do a dispose() on the containing
window. But in a nested-panel layout, getParent() just returns the next
panel up, and so on.

So I wrote a loop to call getParent() until the result came back null.
Then I knew the last non-null result was the window itself. Worked
great, until...

I put the "Close" button in a Dialog that had been called by a Frame.
The loop went up through the nested panels, right through the Dialog,
and found the Frame. So the "Close" button ended up closing the Frame,
which was NOT what I had in mind.

By the way, this Close button is in a bean - that's why I can't
explicitly use the parent window instance name. I don't know the name,
at design time.

Anyway, now I've got to alter my loop to stop at the first Window that
it finds. And I need to ask an elementary question: If I have an
instance of Container, which is what getParent() returns, how can I tell
if that object is a Window or not? I tried casting it to Window and
trapping ClassCastException, but I get the exception every single time,
even when I know I'm actually dealing with a Window. Is there some
cleaner way to do it?

Thanks,
Mark Hunter