virtual bool canvas_region_view_name_event (GdkEvent* event, ArdourCanvas::Item*, RegionView*) = 0;
virtual bool canvas_feature_line_event (GdkEvent* event, ArdourCanvas::Item*, RegionView*) = 0;
virtual bool canvas_stream_view_event (GdkEvent* event, ArdourCanvas::Item*, RouteTimeAxisView*) = 0;
virtual bool canvas_region_view_name_event (GdkEvent* event, ArdourCanvas::Item*, RegionView*) = 0;
virtual bool canvas_feature_line_event (GdkEvent* event, ArdourCanvas::Item*, RegionView*) = 0;
virtual bool canvas_stream_view_event (GdkEvent* event, ArdourCanvas::Item*, RouteTimeAxisView*) = 0;