Preview video frame when dragging

1 files changed, 19 insertions, 0 deletions

diff --git a/gtk2_ardour/editor_drag.h b/gtk2_ardour/editor_drag.h
index 6994b8131f..f4a76cb599 100644
--- a/gtk2_ardour/editor_drag.h
+++ b/gtk2_ardour/editor_drag.h
@@ -120,6 +120,9 @@ public:
 		return _current_pointer_sample;
 	}
 
+	/** return drag-motion displays video-frame of drag-location */
+	bool preview_video () const;
+
 private:
 	Editor* _editor;
 	std::list<Drag*> _drags;
@@ -189,6 +192,10 @@ public:
 		return true;
 	}
 
+	bool preview_video () const {
+		return _preview_video;
+	}
+
 	/** @return minimum number of samples (in x) and pixels (in y) that should be considered a movement */
 	virtual std::pair<ARDOUR::samplecnt_t, int> move_threshold () const {
 		return std::make_pair (1, 1);
@@ -217,6 +224,12 @@ public:
 		_pointer_sample_offset = 0;
 	}
 
+	/** Set up the _video_sample_offset - relative to _current_pointer_sample */
+	virtual void setup_video_sample_offset () {
+		_video_sample_offset = 0;
+		_preview_video = false;
+	}
+
 protected:
 
 	double grab_x () const {
@@ -261,12 +274,15 @@ protected:
 	void show_verbose_cursor_time (samplepos_t);
 	void show_verbose_cursor_duration (samplepos_t, samplepos_t, double xoffset = 0);
 	void show_verbose_cursor_text (std::string const &);
+	void show_view_preview (samplepos_t);
 
 	Editor* _editor; ///< our editor
 	DragManager* _drags;
 	ArdourCanvas::Item* _item; ///< our item
 	/** Offset from the mouse's position for the drag to the start of the thing that is being dragged */
 	ARDOUR::samplecnt_t _pointer_sample_offset;
+	ARDOUR::samplecnt_t _video_sample_offset;
+	bool _preview_video;
 	bool _x_constrained; ///< true if x motion is constrained, otherwise false
 	bool _y_constrained; ///< true if y motion is constrained, otherwise false
 	bool _was_rolling; ///< true if the session was rolling before the drag started, otherwise false
@@ -341,6 +357,8 @@ protected:
 	int _visible_y_high;
 	uint32_t _ntracks;
 
+	void setup_video_sample_offset ();
+
 	friend class DraggingView;
 
 private:
@@ -979,6 +997,7 @@ public:
 	}
 
 	void setup_pointer_sample_offset ();
+	void setup_video_sample_offset ();
 
 private:
 	void update_item (ARDOUR::Location *);