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virtual CItem* addItem(MusECore::Part*, MusECore::Event&) = 0;
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virtual QPoint raster(const QPoint&) const;
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virtual MusECore::Undo moveCanvasItems(CItemList&, int, int, DragType) = 0;
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virtual MusECore::UndoOp moveItem(CItem*, const QPoint&, DragType) = 0;