Method updateMagnificationWindow

src/frontend/worksheet/WorksheetView.cpp:988–1013

! * Updates the magnified content of the scene under the cursor that is shown in the magnification window. * \pos is the current position of the cursor in scene coordinates which defines the middle of the magnification window. */

 * \pos is the current position of the cursor in scene coordinates which defines the middle of the magnification window.
 */
void WorksheetView::updateMagnificationWindow(const QPointF& pos) {
	m_magnificationWindow->setVisible(false);

	// copy the part of the view to be shown magnified
	const int size = Worksheet::convertToSceneUnits(2.0, Worksheet::Unit::Centimeter) / transform().m11();
	const QRectF copyRect(pos.x() - size / (2 * magnificationFactor),
						  pos.y() - size / (2 * magnificationFactor),
						  size / magnificationFactor,
						  size / magnificationFactor);
	QPixmap px = grab(mapFromScene(copyRect).boundingRect());
	px = px.scaled(size, size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

	// draw the bounding rect
	QPainter painter(&px);
	const QPen pen = QPen(Qt::darkGray, 2 / transform().m11());
	painter.setPen(pen);
	QRect rect = px.rect();
	rect.setWidth(rect.width() - pen.widthF() / 2);
	rect.setHeight(rect.height() - pen.widthF() / 2);
	painter.drawRect(rect);

	// set the pixmap and show it again
	m_magnificationWindow->setPixmap(px);
	m_magnificationWindow->setPos(pos.x() - px.width() / 2, pos.y() - px.height() / 2);
	m_magnificationWindow->setVisible(true);
}

void WorksheetView::contextMenuEvent(QContextMenuEvent* e) {
	if ((m_magnificationWindow && m_magnificationWindow->isVisible() && items(e->pos()).size() == 1) || !itemAt(e->pos())) {