Method updatePageRect

src/backend/worksheet/Worksheet.cpp:1587–1614

! * called if the worksheet page (the actual size of worksheet's rectangular) was changed. * if a layout is active, it is is updated - this adjusts the sizes of the elements in the layout to the new page size. * if no layout is active and the option "scale content" is active, \c handleResize() is called to adjust the properties. */

 * if no layout is active and the option "scale content" is active, \c handleResize() is called to adjust the properties.
 */
void WorksheetPrivate::updatePageRect() {
	if (q->isLoading())
		return;

	QRectF oldRect = m_scene->sceneRect();
	m_scene->setSceneRect(pageRect);

	if (layout != Worksheet::Layout::NoLayout)
		updateLayout();
	else {
		if (scaleContent) {
			qreal horizontalRatio = pageRect.width() / oldRect.width();
			qreal verticalRatio = pageRect.height() / oldRect.height();
			const auto& children = q->children<WorksheetElement>(AbstractAspect::ChildIndexFlag::IncludeHidden);
			if (useViewSize) {
				// don't make the change of the geometry undoable/redoable if the view size is used.
				for (auto* elem : children) {
					elem->setUndoAware(false);
					elem->handleResize(horizontalRatio, verticalRatio, true);
					elem->setUndoAware(true);
				}
			} else {
				// 				for (auto* child : children)
				// 					child->handleResize(horizontalRatio, verticalRatio, true);
			}
		}
	}
}

void WorksheetPrivate::update() {
	q->update();