height of visible part of QScrollArea?

[vonCZ]

I have a QScrollArea with a 4,000-pixel (height), custom-painted widget on it. But the actual part of the widget displayed at any given time is more like 400 pixels. How can I determine this number exactly?


I've tried:

myScrollArea->height();

myScrollArea->height();

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and

QRegion treg = myScrollArea->visibleRegion();
QRect trect = tregion.boundingRect();
qDebug("  height = %d", trect.height()  );

QRegion treg = myScrollArea->visibleRegion();
QRect trect = tregion.boundingRect();
qDebug("  height = %d", trect.height()  );

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The first returns "480" (though that's not correct), and the 2nd returns 0. Ideas?