Method navigateNextPrevCurve

src/backend/worksheet/plots/cartesian/CartesianPlot.cpp:4433–4481

}

void CartesianPlotPrivate::navigateNextPrevCurve(bool next) const {
	const auto& curves = q->children<XYCurve>();
	if (curves.isEmpty())
		return;

	// determine the current selected curve
	const XYCurve* selectedCurve = nullptr;
	int index = 0;
	for (const auto* curve : curves) {
		if (curve->graphicsItem()->isSelected()) {
			selectedCurve = curve;
			break;
		}
		++index;
	}

	int newIndex = 0;
	if (selectedCurve) {
		if (next) { // havigate to the next curve
			if (index < curves.size() - 1)
				newIndex = index + 1;
		} else { // navigate to the previous curve
			if (index > 0)
				newIndex = index - 1;
			else
				newIndex = curves.size() - 1;
		}
	}

	auto* w = static_cast<Worksheet*>(q->parent(AspectType::Worksheet));

	// deselect the current curve
	if (selectedCurve)
		w->setItemSelectedInView(selectedCurve->graphicsItem(), false);
	else {
		// no curve is selected, either the plot itself or some
		// other children like axis, etc. are selected.
		// deselect all of them
		w->setItemSelectedInView(this, false); // deselect the plot

		// deselect children
		const auto& elements = q->children<WorksheetElement>(AbstractAspect::ChildIndexFlag::IncludeHidden);
		for (auto* element : elements)
			w->setItemSelectedInView(element->graphicsItem(), false);
	}

	// select the new curve
	w->setItemSelectedInView(curves.at(newIndex)->graphicsItem(), true);
}

void CartesianPlotPrivate::hoverMoveEvent(QGraphicsSceneHoverEvent* event) {
	QPointF point = event->pos();