profile: render profile on desktop via QtQuick

This breaks all dynamic features, including animations,
zooming tooltips, planner-handles, etc. They will have to be
converted one-by-one to QtQuick, which will be a major pain,
as the ProfileView is destroyed by Qt6 on reparenting.
This means that the view cannot store any persistent state.

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

profile-widget/profileview.h

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+#ifndef PROFILE_VIEW_H
+#define PROFILE_VIEW_H
+
+#include "qt-quick/chartview.h"
+#include <memory>
+
+class ChartGraphicsSceneItem;
+class ProfileScene;
+
+class ProfileView : public ChartView {
+	Q_OBJECT
+public:
+	ProfileView();
+	ProfileView(QQuickItem *parent);
+	~ProfileView();
+
+	struct RenderFlags {
+		static constexpr int None = 0;
+		static constexpr int Instant = 1 << 0;
+		static constexpr int DontRecalculatePlotInfo = 1 << 1;
+		static constexpr int EditMode = 1 << 2;
+		static constexpr int PlanMode = 1 << 3;
+	};
+
+	void plotDive(const struct dive *d, int dc, int flags = RenderFlags::None);
+	void clear();
+private:
+	const struct dive *d;
+	int dc;
+	int zoomLevel;
+	double zoomedPosition;	// Position when zoomed: 0.0 = beginning, 1.0 = end.
+	bool empty; // No dive shown.
+	bool shouldCalculateMax; // Calculate maximum time and depth (default). False when dragging handles.
+	std::unique_ptr<ProfileScene> profileScene;
+	ChartItemPtr<ChartGraphicsSceneItem> profileItem;
+
+	void plotAreaChanged(const QSizeF &size) override;
+	void resetPointers() override;
+};
+
+#endif