profile: pass dive to DiveHandler

The DiveHandler shows a context menu where a cylinder can be
chosen. This indirectly accesses the global displayed_dive
variable.

Remove this in a step to make the profile reentrant.

The code was quite ominous: instead of simply generating the
list of cylinders, a global model was reset and then accessed
with Qt's cumbersome model/view API. All this trampling over
global state can be removed by simply making the function
that generates the list globally accessible.

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

profile-widget/divehandler.h

@@ -5,10 +5,12 @@
 #include <QGraphicsPathItem>
 #include <QElapsedTimer>
 
+struct dive;
+
 class DiveHandler : public QObject, public QGraphicsEllipseItem {
 	Q_OBJECT
 public:
-	DiveHandler();
+	DiveHandler(const struct dive *d);
 
 protected:
 	void contextMenuEvent(QGraphicsSceneContextMenuEvent *event);
@@ -26,6 +28,7 @@ slots:
 	void selfRemove();
 	void changeGas();
 private:
+	const struct dive *dive;
 	QElapsedTimer t;
 };