add "fade range" operation, bound to alt-f at present by default

gtk2_ardour/editor.h

@@ -1385,6 +1385,8 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 	void set_fade_in_active (bool);
 	void set_fade_out_active (bool);
 
+	void fade_range ();
+
 	std::set<boost::shared_ptr<ARDOUR::Playlist> > motion_frozen_playlists;
 
 	bool _dragging_playhead;

gtk2_ardour/editor_actions.cc

@@ -336,6 +336,8 @@ Editor::register_actions ()
 	reg_sens (editor_actions, "editor-copy", _("Copy"), sigc::mem_fun(*this, &Editor::copy));
 	reg_sens (editor_actions, "editor-paste", _("Paste"), sigc::mem_fun(*this, &Editor::keyboard_paste));
 
+	reg_sens (editor_actions, "editor-fade-range", _("Fade Range Selection"), sigc::mem_fun(*this, &Editor::fade_range));
+
 	reg_sens (editor_actions, "set-tempo-from-edit-range", _("Set Tempo from Edit Range = Bar"), sigc::mem_fun(*this, &Editor::use_range_as_bar));
 
 	toggle_reg_sens (editor_actions, "toggle-log-window", _("Log"),

gtk2_ardour/editor_ops.cc

@@ -5260,6 +5260,22 @@ Editor::toggle_solo_isolate ()
 {
 }
 
+
+void
+Editor::fade_range ()
+{
+	TrackViewList ts = selection->tracks.filter_to_unique_playlists ();
+
+	begin_reversible_command (_("fade range"));
+
+	for (TrackViewList::iterator i = ts.begin(); i != ts.end(); ++i) {
+		(*i)->fade_range (selection->time);
+	}
+
+	commit_reversible_command ();
+}
+
+
 void
 Editor::set_fade_length (bool in)
 {

gtk2_ardour/mnemonic-us.bindings.in

@@ -190,6 +190,7 @@ This mode provides many different operations on both regions and control points,
 @select|Editor/select-all-in-punch-range|<@PRIMARY@>d|select all in punch range
 @vis|Editor/fit-tracks|f|fit tracks vertically
 @trans|Editor/toggle-follow-playhead|<@PRIMARY@>f|toggle playhead tracking
+@trans|Editor/editor-fade-range|<@SECONDARY@>f|fade range selection
 @trans|Transport/ToggleFollowEdits|<@TERTIARY@>f|toggle playhead follows edits
 @wvis|Common/ToggleMaximalEditor|<@PRIMARY@><@SECONDARY@>f|maximise editor space
 @wvis|Common/ToggleMaximalMixer|F12|maximise mixer space

gtk2_ardour/route_time_axis.cc

@@ -1384,6 +1384,41 @@ RouteTimeAxisView::find_next_region_boundary (framepos_t pos, int32_t dir)
 	return -1;
 }
 
+void
+RouteTimeAxisView::fade_range (TimeSelection& selection)
+{
+	boost::shared_ptr<Playlist> what_we_got;
+	boost::shared_ptr<Track> tr = track ();
+	boost::shared_ptr<Playlist> playlist;
+
+	if (tr == 0) {
+		/* route is a bus, not a track */
+		return;
+	}
+
+	playlist = tr->playlist();
+
+	TimeSelection time (selection);
+	float const speed = tr->speed();
+	if (speed != 1.0f) {
+		for (TimeSelection::iterator i = time.begin(); i != time.end(); ++i) {
+			(*i).start = session_frame_to_track_frame((*i).start, speed);
+			(*i).end   = session_frame_to_track_frame((*i).end,   speed);
+		}
+	}
+
+        playlist->clear_changes ();
+        playlist->clear_owned_changes ();
+
+	playlist->fade_range (time);
+
+	vector<Command*> cmds;
+	playlist->rdiff (cmds);
+	_session->add_commands (cmds);
+	_session->add_command (new StatefulDiffCommand (playlist));
+
+}
+
 void
 RouteTimeAxisView::cut_copy_clear (Selection& selection, CutCopyOp op)
 {

gtk2_ardour/route_time_axis.h

@@ -104,6 +104,7 @@ public:
 	void uncombine_regions ();
 	void uncombine_region (RegionView*);
 	void toggle_automation_track (const Evoral::Parameter& param);
+	void fade_range (TimeSelection&);
 
 	/* The editor calls these when mapping an operation across multiple tracks */
 	void use_new_playlist (bool prompt, std::vector<boost::shared_ptr<ARDOUR::Playlist> > const &);

gtk2_ardour/time_axis_view.h

@@ -167,6 +167,8 @@ class TimeAxisView : public virtual AxisView
 	virtual void set_selected_regionviews (RegionSelection&) {}
 	virtual void set_selected_points (PointSelection&) {}
 
+	virtual void fade_range (TimeSelection&) {}
+
 	virtual boost::shared_ptr<ARDOUR::Region> find_next_region (framepos_t /*pos*/, ARDOUR::RegionPoint, int32_t /*dir*/) {
 		return boost::shared_ptr<ARDOUR::Region> ();
 	}