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...
-John Weeks
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