profile: port basic dive editing to QtQuick

This needed a bit of refactoring of the ChartItem code, because
we have to be signaled on drag start. Currently only one handle
can be selected at a time. This was (implicitly) the case anyway,
as far as I can tell.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

profile-widget/handleitem.cpp

@@ -0,0 +1,153 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "handleitem.h"
+#include "profileview.h"
+#include "zvalues.h"
+
+#include <QApplication>
+
+static QColor handleBorderColor(Qt::black);
+static QColor handleColor(Qt::white);
+static QColor gasColor(Qt::black);
+static constexpr double handleRadius = 5.0;
+
+class HandleItemHandle : public ChartDiskItem {
+	ProfileView &profileView;
+	int idx;
+public:
+	HandleItemHandle(ChartView &view, double dpr, int idx, ProfileView &profileView) :
+		ChartDiskItem(view,
+			      ProfileZValue::Handles,
+			      QPen(handleBorderColor, dpr),
+			      QBrush(handleColor),
+			      true),
+		profileView(profileView),
+		idx(idx)
+	{
+	}
+	void setIdx(int idxIn)
+	{
+		idx = idxIn;
+	}
+	void drag(QPointF pos) override
+	{
+		profileView.handleDragged(idx, pos);
+	}
+	void startDrag(QPointF) override
+	{
+		profileView.handleSelected(idx);
+	}
+	void stopDrag(QPointF) override
+	{
+		profileView.handleReleased(idx);
+	}
+};
+
+HandleItem::HandleItem(ProfileView &view, double dpr, int idx) :
+		handle(view.createChartItem<HandleItemHandle>(dpr, idx, view)),
+		dpr(dpr),
+		view(view)
+{
+	handle->resize(handleRadius * dpr);
+}
+
+HandleItem::~HandleItem()
+{
+}
+
+void HandleItem::del()
+{
+	handle.del();
+	if (text)
+		text.del();
+}
+
+void HandleItem::setIdx(int idx)
+{
+	handle->setIdx(idx);
+}
+
+void HandleItem::setPos(QPointF pos)
+{
+	handle->setPos(pos);
+}
+
+QPointF HandleItem::getPos() const
+{
+	return handle->getPos();
+}
+
+void HandleItem::setTextPos(QPointF pos)
+{
+	if (text)
+		text->setPos(pos);
+}
+
+void HandleItem::setVisible(bool handleVisible, bool textVisible)
+{
+	handle->setVisible(handleVisible);
+	if (text)
+		text->setVisible(textVisible);
+}
+
+// duplicate code in tooltipitem.cpp
+static QFont makeFont(double dpr)
+{
+	QFont font(qApp->font());
+	if (dpr != 1.0) {
+		int pixelSize = font.pixelSize();
+		if (pixelSize > 0) {
+			pixelSize = lrint(static_cast<double>(pixelSize) * dpr);
+			font.setPixelSize(pixelSize);
+		} else {
+			font.setPointSizeF(font.pointSizeF() * dpr);
+		}
+	}
+	return font;
+}
+
+void HandleItem::setText(const QString &s)
+{
+	if (text && std::exchange(oldText, s) == s)
+		return;
+	if (text)
+		text.del();
+
+	QFont f = makeFont(dpr);
+	text = view.createChartItem<ChartTextItem>(ProfileZValue::Handles, f, s);
+	text->setColor(gasColor);
+}
+
+/*
+void HandleItem::contextMenuEvent(QGraphicsSceneContextMenuEvent *event)
+{
+	QMenu m;
+	// Don't have a gas selection for the last point
+	emit released();
+	DivePlannerPointsModel *plannerModel = DivePlannerPointsModel::instance();
+	QModelIndex index = plannerModel->index(parentIndex(), DivePlannerPointsModel::GAS);
+	if (index.sibling(index.row() + 1, index.column()).isValid()) {
+		QStringList gases = get_dive_gas_list(dive);
+		for (int i = 0; i < gases.size(); i++) {
+			QAction *action = new QAction(&m);
+			action->setText(gases[i]);
+			action->setData(i);
+			connect(action, &QAction::triggered, this, &HandleItem::changeGas);
+			m.addAction(action);
+		}
+	}
+	// don't allow removing the last point
+	if (plannerModel->rowCount() > 1) {
+		m.addSeparator();
+		m.addAction(gettextFromC::tr("Remove this point"), this, &HandleItem::selfRemove);
+		m.exec(event->screenPos());
+	}
+}
+
+void HandleItem::changeGas()
+{
+	QAction *action = qobject_cast<QAction *>(sender());
+	DivePlannerPointsModel *plannerModel = DivePlannerPointsModel::instance();
+	QModelIndex index = plannerModel->index(parentIndex(), DivePlannerPointsModel::GAS);
+	plannerModel->gasChange(index.sibling(index.row() + 1, index.column()), action->data().toInt());
+}
+*/