bool canvas_stream_view_event (GdkEvent* event,ArdourCanvas::Item*, RouteTimeAxisView*);
bool canvas_marker_event (GdkEvent* event,ArdourCanvas::Item*, ArdourMarker*);
bool canvas_tempo_marker_event (GdkEvent* event,ArdourCanvas::Item*, TempoMarker*);
bool canvas_stream_view_event (GdkEvent* event,ArdourCanvas::Item*, RouteTimeAxisView*);
bool canvas_marker_event (GdkEvent* event,ArdourCanvas::Item*, ArdourMarker*);
bool canvas_tempo_marker_event (GdkEvent* event,ArdourCanvas::Item*, TempoMarker*);