Method selectionChanged

src/frontend/worksheet/WorksheetView.cpp:1602–1643

! * Called on selection changes in the view. * Determines which items were selected and deselected * and forwards these changes to \c Worksheet */

 *  and forwards these changes to \c Worksheet
 */
void WorksheetView::selectionChanged() {
	// if the project is being closed, the scene items are being removed and the selection can change.
	// don't react on these changes since this can lead crashes (worksheet object is already in the destructor).
	if (m_isClosing)
		return;

	if (m_suppressSelectionChangedEvent)
		return;

	QList<QGraphicsItem*> items = scene()->selectedItems();

	// check, whether the previously selected items were deselected now.
	// Forward the deselection prior to the selection of new items
	// in order to avoid the unwanted multiple selection in project explorer
	for (auto* item : m_selectedItems) {
		if (items.indexOf(item) == -1)
			m_worksheet->setItemSelectedInView(item, false);
	}

	// select new items
	if (items.isEmpty()) {
		// no items selected -> select the worksheet again.
		m_worksheet->setSelectedInView(true);

		// if one of the "zoom&select" plot mouse modes was selected before, activate the default "selection mode" again
		// since no plots are selected now.
		if (m_mouseMode == MouseMode::Selection && m_cartesianPlotMouseMode != CartesianPlot::MouseMode::Selection) {
			cartesianPlotSelectionModeAction->setChecked(true);
			cartesianPlotMouseModeChanged(cartesianPlotSelectionModeAction);
		}
	} else {
		for (const auto* item : items)
			m_worksheet->setItemSelectedInView(item, true);

		// items selected -> deselect the worksheet in the project explorer
		// prevents unwanted multiple selection with worksheet (if it was selected before)
		m_worksheet->setSelectedInView(false);
	}

	m_selectedItems = std::move(items);
	handleCartesianPlotActions();
}

void WorksheetView::handleCartesianPlotSelected(CartesianPlot* plot) {
	if (tbCartesianPlotAddNew) { // not available in the presenter mode