Support of the Type field for QGraphicsItems

This enables the use of qgraphicsitem_cast()

src/gui/AbstractGraphicsMediaItem.h

@@ -35,6 +35,9 @@ public:
     AbstractGraphicsMediaItem();
     virtual ~AbstractGraphicsMediaItem() { }
 
+    /// Return the Type of the MediaItem (see http://doc.trolltech.com/4.5/qgraphicsitem.html#type)
+    virtual int type() const = 0;
+
     /// The item length can be expanded or shrinked by the user.
     virtual bool expandable() const = 0;
 

src/gui/GraphicsMovieItem.h

@@ -31,9 +31,11 @@ class GraphicsMovieItem : public AbstractGraphicsMediaItem
 {
     Q_OBJECT
 public:
+    enum { Type = UserType + 1 };
     GraphicsMovieItem( Media* media );
     virtual ~GraphicsMovieItem();
 
+    virtual int type() const { return Type; }
     virtual bool expandable() const { return false; }
     virtual bool moveable() const { return true; }
     virtual const QUuid& uuid() const { return m_media->getUuid(); }