Add stacked lanes mode which displays regions on different layers at different positions in the view.

git-svn-id: svn://localhost/ardour2/trunk@1855 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 22 insertions, 11 deletions

diff --git a/gtk2_ardour/automation_line.cc b/gtk2_ardour/automation_line.cc
index 67f91e1ed4..a729161911 100644
--- a/gtk2_ardour/automation_line.cc
+++ b/gtk2_ardour/automation_line.cc
@@ -232,6 +232,7 @@ AutomationLine::AutomationLine (const string & name, TimeAxisView& tv, ArdourCan
 	no_draw = false;
 	_visible = true;
 	terminal_points_can_slide = true;
+	_y_position = 0;
 	_height = 0;
 
 	group = new ArdourCanvas::Group (parent);
@@ -307,17 +308,27 @@ AutomationLine::control_point_box_size ()
 }
 
 void
-AutomationLine::set_height (guint32 h)
+AutomationLine::set_y_position_and_height (guint32 y, guint32 h)
 {
+	bool changed = false;
+	
+	if (y != _y_position) {
+		_y_position = y;
+		changed = true;
+	}
+		
 	if (h != _height) {
 		_height = h;
 
-		double bsz = control_point_box_size();
+		double const bsz = control_point_box_size();
 
 		for (vector<ControlPoint*>::iterator i = control_points.begin(); i != control_points.end(); ++i) {
 			(*i)->set_size (bsz);
 		}
+		changed = true;
+	}
 
+	if (changed) {
 		reset ();
 	}
 }
@@ -365,7 +376,7 @@ AutomationLine::modify_view_point (ControlPoint& cp, double x, double y, bool wi
 
 	y = max (0.0, y);
 	y = min (1.0, y);
-	y = _height - (y * _height);
+	y = _y_position + _height - (y * _height);
 
 	if (cp.can_slide) {
 
@@ -494,7 +505,7 @@ AutomationLine::model_representation (ControlPoint& cp, ModelRepresentation& mr)
 	*/
 	
 	mr.xval = (nframes_t) floor (cp.get_x());
-	mr.yval = 1.0 - (cp.get_y() / _height);
+	mr.yval = 1.0 - ( (cp.get_y() - _y_position) / _height);
 
         /* if xval has not changed, set it directly from the model to avoid rounding errors */
 
@@ -831,7 +842,7 @@ AutomationLine::point_drag (ControlPoint& cp, nframes_t x, float fraction, bool
 void
 AutomationLine::line_drag (uint32_t i1, uint32_t i2, float fraction, bool with_push) 
 {
-	double ydelta = fraction - last_drag_fraction;
+	double const ydelta = fraction - last_drag_fraction;
 
 	did_push = with_push;
 	
@@ -844,7 +855,7 @@ AutomationLine::line_drag (uint32_t i1, uint32_t i2, float fraction, bool with_p
 
 	for (uint32_t i = i1 ; i <= i2; i++) {
 		cp = nth (i);
-		modify_view_point (*cp, trackview.editor.unit_to_frame (cp->get_x()), ((_height - cp->get_y()) /_height) + ydelta, with_push);
+		modify_view_point (*cp, trackview.editor.unit_to_frame (cp->get_x()), ((_height - cp->get_y() + _y_position) /_height) + ydelta, with_push);
 	}
 
 	if (line_points.size() > 1) {
@@ -1041,8 +1052,8 @@ AutomationLine::get_selectables (nframes_t& start, nframes_t& end,
 
 	/* Curse X11 and its inverted coordinate system! */
 	
-	bot = (1.0 - topfrac) * _height;
-	top = (1.0 - botfrac) * _height;
+	bot = _y_position + (1.0 - topfrac) * _height;
+	top = _y_position + (1.0 - botfrac) * _height;
 	
 	nstart = max_frames;
 	nend = 0;
@@ -1108,8 +1119,8 @@ AutomationLine::set_selected_points (PointSelection& points)
 
 		/* Curse X11 and its inverted coordinate system! */
 
-		bot = (1.0 - (*r).high_fract) * _height;
-		top = (1.0 - (*r).low_fract) * _height;
+		bot = _y_position + (1.0 - (*r).high_fract) * _height;
+		top = _y_position + (1.0 - (*r).low_fract) * _height;
 
 		for (vector<ControlPoint*>::iterator i = control_points.begin(); i != control_points.end(); ++i) {
 			
@@ -1203,7 +1214,7 @@ AutomationLine::reset_callback (const AutomationList& events)
 		model_to_view_y (translated_y);
 
 		tmp_points.push_back (ALPoint (trackview.editor.frame_to_unit ((*ai)->when),
-					       _height - (translated_y * _height)));
+					       _y_position + _height - (translated_y * _height)));
 	}
 	
 	determine_visible_control_points (tmp_points);