From c2476ea73da79237984fb4cedb397033d0bd62ec Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 3 Dec 2014 09:15:10 -0500
Subject: [PATCH] add API for controlling and determining active status of a
 SceneChange

Conflicts:
	libs/ardour/ardour/scene_change.h
---
 libs/ardour/ardour/scene_change.h | 22 +++++++++++++---------
 libs/ardour/midi_scene_changer.cc |  8 ++++++++
 libs/ardour/scene_change.cc       | 10 ++++++++++
 3 files changed, 31 insertions(+), 9 deletions(-)

diff --git a/libs/ardour/ardour/scene_change.h b/libs/ardour/ardour/scene_change.h
index ee711985b5..661d2238b7 100644
--- a/libs/ardour/ardour/scene_change.h
+++ b/libs/ardour/ardour/scene_change.h
@@ -36,17 +36,21 @@ class SceneChange : public PBD::Stateful
 	static boost::shared_ptr<SceneChange> factory (const XMLNode&, int version);
 	static std::string xml_node_name;
 
-	uint32_t color() const;
-	void set_color (uint32_t);
-	bool color_out_of_bounds() const { return _color == out_of_bound_color; }
-	static const uint32_t out_of_bound_color;
+        uint32_t color() const;
+        void set_color (uint32_t);
+        bool color_out_of_bounds() const { return _color == out_of_bound_color; }
+        static const uint32_t out_of_bound_color;
+
+        bool active () const { return _active; }
+        void set_active (bool);
         
-	PBD::Signal0<void> ColorChanged;
-
-protected:
-	/* derived classes are responsible for serializing & deserializing this value */
-	uint32_t _color;
+        PBD::Signal0<void> ColorChanged;
+        PBD::Signal0<void> ActiveChanged;
 
+    protected:
+        /* derived classes are responsible for serializing & deserializing this value */
+        uint32_t _color;
+        bool     _active;
 };
 
 } /* namespace */
diff --git a/libs/ardour/midi_scene_changer.cc b/libs/ardour/midi_scene_changer.cc
index bd32ff308b..6288a6fc84 100644
--- a/libs/ardour/midi_scene_changer.cc
+++ b/libs/ardour/midi_scene_changer.cc
@@ -96,6 +96,10 @@ MIDISceneChanger::gather (const Locations::LocationList& locations)
 void
 MIDISceneChanger::rt_deliver (MidiBuffer& mbuf, framepos_t when, boost::shared_ptr<MIDISceneChange> msc)
 {
+        if (!msc->active()) {
+                return;
+        }
+
 	uint8_t buf[4];
 	size_t cnt;
 
@@ -121,6 +125,10 @@ MIDISceneChanger::rt_deliver (MidiBuffer& mbuf, framepos_t when, boost::shared_p
 void
 MIDISceneChanger::non_rt_deliver (boost::shared_ptr<MIDISceneChange> msc)
 {
+        if (!msc->active()) {
+                return;
+        }
+
 	uint8_t buf[4];
 	size_t cnt;
 	boost::shared_ptr<AsyncMIDIPort> aport = boost::dynamic_pointer_cast<AsyncMIDIPort>(output_port);
diff --git a/libs/ardour/scene_change.cc b/libs/ardour/scene_change.cc
index 6560a7ca2f..322b37a195 100644
--- a/libs/ardour/scene_change.cc
+++ b/libs/ardour/scene_change.cc
@@ -41,6 +41,7 @@ SceneChange::factory (const XMLNode& node, int version)
 
 SceneChange::SceneChange ()
         : _color (out_of_bound_color)
+        , _active (true)
 {
 }
 
@@ -56,3 +57,12 @@ SceneChange::color() const
 {
         return _color;
 }
+
+void
+SceneChange::set_active (bool yn)
+{
+        if (_active != yn) {
+                _active = yn;
+                ActiveChanged (); /* EMIT SIGNAL */
+        }
+}