QAbstractScrollArea example

Detailed Description:
QSize areaSize = viewport()->size();
QSize widgetSize = widget->size();

verticalScrollBar()->setPageStep(widgetSize.height());
horizontalScrollBar()->setPageStep(widgetSize.width());
verticalScrollBar()->setRange(0, widgetSize.height() - areaSize.height());
horizontalScrollBar()->setRange(0, widgetSize.width() - areaSize.width());
updateWidgetPosition();

Must be (mistyping):
verticalScrollBar()->setPageStep(areaSize.height());
horizontalScrollBar()->setPageStep(areaSize.width());