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>

qt-quick/chartitem.cpp

@@ -37,6 +37,10 @@ QRectF ChartItem::getRect() const
 	return rect;
 }
 
+void ChartItem::startDrag(QPointF pos)
+{
+}
+
 void ChartItem::drag(QPointF)
 {
 }

qt-quick/chartitem.h

@@ -30,9 +30,11 @@ public:
 	const bool dragable;			// Item can be dragged with the mouse. Must be set in constructor.
 	virtual ~ChartItem();			// Attention: must only be called by render thread.
 	QRectF getRect() const;
+	virtual void startDrag(QPointF pos);	// Called when user clicks on a draggable item
 	virtual void drag(QPointF pos);		// Called when dragging the item
 	virtual void stopDrag(QPointF pos);	// Called when dragging the item finished
 protected:
+	template <typename T> friend class ChartItemPtr;
 	ChartItem(ChartView &v, size_t z, bool dragable = false);
 	QSizeF sceneSize() const;
 	ChartView &view;

qt-quick/chartitem_ptr.h

@@ -49,6 +49,12 @@ public:
 	{
 		return ptr;
 	}
+	void del()
+	{
+		if (!ptr)
+			return;
+		ptr->view.deleteChartItem(*this);
+	}
 };
 
 #endif

qt-quick/chartview.cpp

@@ -315,6 +315,7 @@ void ChartView::mousePressEvent(QMouseEvent *event)
 			dragStartMouse = pos;
 			dragStartItem = rect.topLeft();
 			draggedItem = item;
+			draggedItem->startDrag(pos);
 			grabMouse();
 			setKeepMouseGrab(true); // don't allow Qt to steal the grab
 			event->accept();