From 83b5be1addd392f6920e7b97e8c6fc1fcbe28365 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 24 May 2022 20:07:35 +0200
Subject: [PATCH] Add static signal to indicate MixerScene changes

---
 libs/ardour/ardour/mixer_scene.h |  3 +++
 libs/ardour/mixer_scene.cc       | 13 ++++++++++++-
 2 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/libs/ardour/ardour/mixer_scene.h b/libs/ardour/ardour/mixer_scene.h
index 8356e3866f..afb9a5f156 100644
--- a/libs/ardour/ardour/mixer_scene.h
+++ b/libs/ardour/ardour/mixer_scene.h
@@ -36,6 +36,7 @@ class LIBARDOUR_API MixerScene : public SessionHandleRef, public PBD::Stateful
 {
 public:
 	MixerScene (Session&);
+	~MixerScene ();
 
 	void snapshot ();
 	bool apply () const;
@@ -48,6 +49,8 @@ public:
 	XMLNode& get_state () const;
 	int set_state (XMLNode const&, int version);
 
+	static PBD::Signal0<void> Change;
+
 private:
 	typedef std::map<PBD::ID, double> ControllableValueMap;
 
diff --git a/libs/ardour/mixer_scene.cc b/libs/ardour/mixer_scene.cc
index 5559e555b5..8a49e9e8a4 100644
--- a/libs/ardour/mixer_scene.cc
+++ b/libs/ardour/mixer_scene.cc
@@ -29,9 +29,17 @@
 using namespace PBD;
 using namespace ARDOUR;
 
-MixerScene::MixerScene(Session& s)
+PBD::Signal0<void> MixerScene::Change;
+
+MixerScene::MixerScene (Session& s)
 	: SessionHandleRef (s)
 {
+	Change (); /* EMIT SIGNAL */
+}
+
+MixerScene::~MixerScene ()
+{
+	Change (); /* EMIT SIGNAL */
 }
 
 bool
@@ -40,6 +48,7 @@ MixerScene::set_name (std::string const& name)
 	if (_name != name) {
 		_name = name;
 		_session.set_dirty ();
+		Change (); /* EMIT SIGNAL */
 	}
 	return true;
 }
@@ -49,6 +58,7 @@ MixerScene::clear ()
 {
 	_ctrl_map.clear ();
 	_name.clear ();
+	Change (); /* EMIT SIGNAL */
 }
 
 void
@@ -65,6 +75,7 @@ MixerScene::snapshot ()
 		_ctrl_map[c->id ()] = c->get_save_value ();
 	}
 	_session.set_dirty ();
+	Change (); /* EMIT SIGNAL */
 }
 
 bool