From 9b8040a9f4d9094f745a27144e210ca6cbbcb8b3 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Tue, 4 Jul 2023 21:06:25 +0200
Subject: [PATCH] Add Lua signal emitted when editor selection changed

---
 gtk2_ardour/luainstance.cc   | 13 +++++++++++++
 gtk2_ardour/luainstance.h    |  4 ++++
 gtk2_ardour/luasignal_syms.h |  3 +++
 3 files changed, 20 insertions(+)

diff --git a/gtk2_ardour/luainstance.cc b/gtk2_ardour/luainstance.cc
index d54e551ed9..6898428587 100644
--- a/gtk2_ardour/luainstance.cc
+++ b/gtk2_ardour/luainstance.cc
@@ -539,6 +539,7 @@ using namespace ARDOUR;
 PBD::Signal0<void> LuaInstance::LuaTimerS;
 PBD::Signal0<void> LuaInstance::LuaTimerDS;
 PBD::Signal0<void> LuaInstance::SetSession;
+PBD::Signal0<void> LuaInstance::SelectionChanged;
 
 void
 LuaInstance::register_hooks (lua_State* L)
@@ -1346,6 +1347,12 @@ LuaInstance::init ()
 
 	luabridge::push <PublicEditor *> (L, &PublicEditor::instance());
 	lua_setglobal (L, "Editor");
+
+	Selection& sel (PublicEditor::instance().get_selection ());
+	sel.TimeChanged.connect (sigc::mem_fun (*this, &LuaInstance::selection_changed));
+	sel.RegionsChanged.connect (sigc::mem_fun (*this, &LuaInstance::selection_changed));
+	sel.TracksChanged.connect (sigc::mem_fun (*this, &LuaInstance::selection_changed));
+	sel.MarkersChanged.connect (sigc::mem_fun (*this, &LuaInstance::selection_changed));
 }
 
 int
@@ -1458,6 +1465,12 @@ LuaInstance::every_point_one_seconds ()
 	LuaTimerDS (); // emit signal
 }
 
+void
+LuaInstance::selection_changed ()
+{
+	SelectionChanged (); // emit signal
+}
+
 int
 LuaInstance::set_state (const XMLNode& node)
 {
diff --git a/gtk2_ardour/luainstance.h b/gtk2_ardour/luainstance.h
index 4b146e7ba0..ba16bf6591 100644
--- a/gtk2_ardour/luainstance.h
+++ b/gtk2_ardour/luainstance.h
@@ -154,6 +154,7 @@ public:
 	static PBD::Signal0<void> LuaTimerS; // deci-seconds (Timer every 1s)
 	static PBD::Signal0<void> LuaTimerDS; // deci-seconds (Timer every .1s)
 	static PBD::Signal0<void> SetSession; // emitted when a session is loaded
+	static PBD::Signal0<void> SelectionChanged; // emitted when editor selection changes
 
 private:
 	LuaInstance();
@@ -180,11 +181,14 @@ private:
 	LuaCallbackMap _callbacks;
 	PBD::ScopedConnectionList _slotcon;
 
+	void selection_changed ();
+
 	void every_second ();
 	sigc::connection second_connection;
 
 	void every_point_one_seconds ();
 	sigc::connection point_one_second_connection;
+
 };
 
 #endif
diff --git a/gtk2_ardour/luasignal_syms.h b/gtk2_ardour/luasignal_syms.h
index 0256bcff9b..8f5630c84a 100644
--- a/gtk2_ardour/luasignal_syms.h
+++ b/gtk2_ardour/luasignal_syms.h
@@ -91,6 +91,9 @@ STATIC(LuaTimerDS, &LuaInstance::LuaTimerDS, 0)
 // Session load
 STATIC(SetSession, &LuaInstance::SetSession, 0)
 
+// Editor Selection Changed
+STATIC(SelectionChanged, &LuaInstance::SelectionChanged, 0)
+
 // TODO per track/route signals,
 // TODO per plugin actions / controllables
 // TODO per region actions