getOffsetHeight/Width only returns a value other than 0 if the element has
been successfully rendered by the browser (possibly including elements that
have visibility:hidden css).
When you call DeckLayoutPanel.setWidget(w) the DeckLayoutPanel schedules a
layout command which will be executed after all of your code has been
executed and just before the browser takes back control (see:
Scheduler.get().scheduleFinally()). I think this has been done because you
could call DeckLayoutPanel.setWidget() multiple times in your code, but
when your code is done, the necessary DOM operations will be executed only
once.
You can force the DOM operations by calling DeckLayoutPanel.forceLayout()
just after you have called DeckLayoutPanel.setWidget() and then try to do
your calculations. But I am not quite sure if its enough. If not, your best
bet is to defer your calculations until everything has been rendered by the
browser:
final Panel p = ...
Scheduler.get().scheduleDeferred(new Scheduler.ScheduledCommand() {
public void run() {
p.getOffsetHeight() ... //calculate your stuff
}
});
Using a deferred command should definitely work.
-- J.
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