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virtual QPoint raster(const QPoint&) const;
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virtual int y2pitch(int y) const;
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virtual int pitch2y(int p) const;
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virtual CItem* newItem(const QPoint&, int);
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virtual void resizeItem(CItem*,bool, bool ctrl);
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virtual void newItem(CItem*,bool);
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virtual bool deleteItem(CItem*);
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virtual void moveCanvasItems(CItemList&, int, int, DragType);
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virtual void moveCanvasItems(CItemList&, int, int, DragType, bool rasterize = true);
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virtual bool moveItem(MusECore::Undo& operations, CItem*, const QPoint&, DragType);
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virtual void updateSong(DragType, MusECore::SongChangedFlags_t);