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enum ZoomPosition { TopLeft, TopRight, BottomLeft, BottomRight, Auto };
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enum EditingMode { None, AddNewElement, AddNewEdge, DrawNewEdge };
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enum EditingMode { None, AddNewElement, AddNewEdge, DrawNewEdge, SelectingElements };
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enum ScrollDirection { Here, Left, Right, Top, Bottom };
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explicit DotGraphView(KActionCollection* actions, QWidget* parent=0);