Method mousePressEvent

src/frontend/datapicker/DatapickerImageView.cpp:415–485

}

void DatapickerImageView::mousePressEvent(QMouseEvent* event) {
	// prevent the deselection of items when context menu event
	// was triggered (right button click)
	if (event->button() == Qt::RightButton) {
		event->accept();
		return;
	}

	if (event->button() == Qt::LeftButton && m_mouseMode == MouseMode::ZoomSelection) {
		m_selectionStart = event->pos();
		m_selectionBandIsShown = true;
		return;
	}

	const auto eventPos = mapToScene(event->pos());
	const auto type = m_image->plotPointsType();
	bool entryMode =
		(m_mouseMode == MouseMode::ReferencePointsEntry || m_mouseMode == MouseMode::CurvePointsEntry || m_mouseMode == MouseMode::CurveSegmentsEntry);

	// check whether there is a point item under the cursor
	bool pointsUnderCursor = false;
	const auto& items = this->items(event->pos());
	const auto& referencePoints = m_image->children<DatapickerPoint>(AbstractAspect::ChildIndexFlag::IncludeHidden);
	for (auto* item : items) {
		if (item == m_image->m_magnificationWindow)
			continue;

		// when entering curve points, ignore the reference points under the cursor,
		// it should be possible to place curve points close to or over the reference points.
		if (type == DatapickerImage::PointsType::CurvePoints) {
			bool referenceItem = false;
			for (auto* point : referencePoints) {
				if (point->graphicsItem() == item) {
					referenceItem = true;
					break;
				}
			}

			if (referenceItem)
				continue;
		}

		pointsUnderCursor = true;
		break;
	}

	if (entryMode && !pointsUnderCursor && m_image->isLoaded && sceneRect().contains(eventPos)) {
		if (type == DatapickerImage::PointsType::AxisPoints) {
			int childCount = m_image->childCount<DatapickerPoint>(AbstractAspect::ChildIndexFlag::IncludeHidden);
			if (childCount < 3)
				m_datapicker->addNewPoint(eventPos, m_image);
		} else if (type == DatapickerImage::PointsType::CurvePoints && m_datapicker->activeCurve())
			m_datapicker->addNewPoint(eventPos, m_datapicker->activeCurve());

		if (m_image->m_magnificationWindow && m_image->m_magnificationWindow->isVisible())
			updateMagnificationWindow();
	}