// Get highlight status when the cursor is over the timeline.
virtual double test_highlight();
virtual int has_preview() { return 0; }
+ virtual int is_vwindow() { return 0; }
void update_labels();
void update_points();
// Make sure widgets are highlighted according to selection status
void update_highlights();
+ void draw_inout_highlight();
// Update highlight cursor during a drag
virtual void update_cursor();