Op 21-9-2015 om 19:33 schreef John Weeks:
> If this is a repeat, my apologies. I can't tell if I saw this arrive on the
> list!
>
>
>
> In general a QWidget that hasn't been made visible yet gives bogus results
> for QWidget::geometry(). Qt only guarantees that a call to setGeometry() will
> result in a Resize event when the window is made visible. But we often need
> to ask a window or child widget how big it is before it is made visible in
> order to do various kinds of calculations. These calculations are sometimes
> used for things that preclude waiting for the window to become visible.
>
> Is there a way to force the Resize events (and all the layout calculation
> machinery that goes with it) before it is visible? Using Qt 5.5, I see that
> if you call QWidget::grab(), it will call a static function
> sendResizeEvents() that does exactly what I want:
>
> QPixmap QWidget::grab(const QRect &rectangle)
> {
> Q_D(QWidget);
> if (testAttribute(Qt::WA_PendingResizeEvent) ||
> !testAttribute(Qt::WA_WState_Created))
> sendResizeEvents(this);
>
> Is there some other way to get this to happen? I suppose I could just call
> grab() and throw away the QPixmap, but that seems like an awful kludge...
>
In the past, I have resorted to first showing the window off-screen,
getting its measurements, do my thing, and only then move it to the
visible area of the screen. It works, but it is a drag. In my case it
was needed in order to make a dialog that nicely resizes using an
animation when different options are selected.
André
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