Is there a "layout complete" event?

fredrossperry

I am making a simple multi-page document viewer. I have an initially empty QScrollArea, to whose layout I add
several (or many) QLabel widgets. I create and size these QLabels and add them to the layout in a loop, which does not take long.

The problem is that right after this, I try and determine which ones are visible within the QScrollArea using
visibleRegion(), but none of them appear visible. If, however, I go away for 200 msec (using a QTimer)
and try again, I then get the results I expect.

So, question: how can I determine exactly when the sizing/layout of these QLabels is actually done?

Thanks.

SGaist

Hi,

You could use the showEvent method from your QScrollArea container.

fredrossperry

Thanks for your reply. I was able to put an event filter on the scroll area's content widget, and watch for QEvent::LayoutRequest.

SGaist

Nice, but AFAIK, that event means that the layout should be updated, not that it has already happened