Add signals to indicate Punch/Loop constraints

This is in preparation for GUI sensitivity of Loop and Punch actions.

3 files changed, 22 insertions, 4 deletions

diff --git a/libs/ardour/ardour/session.h b/libs/ardour/ardour/session.h
index 221a5ab6cc..1ed5413206 100644
--- a/libs/ardour/ardour/session.h
+++ b/libs/ardour/ardour/session.h
@@ -775,6 +775,10 @@ public:
 	
 	bool silent () { return _silent; }
 
+	bool punch_is_possible () const;
+	bool loop_is_possible () const;
+	PBD::Signal0<void> PunchLoopConstraintChange;
+
 	TempoMap&       tempo_map()       { return *_tempo_map; }
 	const TempoMap& tempo_map() const { return *_tempo_map; }
 	void maybe_update_tempo_from_midiclock_tempo (float bpm);
@@ -1702,11 +1706,9 @@ private:
 
 	volatile guint _punch_or_loop; // enum PunchLoopLock
 
-	bool punch_is_possible () const;
-	bool loop_is_possible () const;
-
 	bool punch_active () const;
 	void unset_punch ();
+	void reset_punch_loop_constraint ();
 	bool maybe_allow_only_loop (bool play_loop = false);
 	bool maybe_allow_only_punch ();
 
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc
index a2c61c8bb8..74c0fbb22e 100644
--- a/libs/ardour/session.cc
+++ b/libs/ardour/session.cc
@@ -1428,12 +1428,25 @@ Session::loop_is_possible () const
 	return g_atomic_int_get(&_punch_or_loop) != OnlyPunch;
 }
 
+void
+Session::reset_punch_loop_constraint ()
+{
+	if (g_atomic_int_get (&_punch_or_loop) == NoConstraint) {
+		return;
+	}
+	g_atomic_int_set (&_punch_or_loop, NoConstraint);
+	PunchLoopConstraintChange (); /* EMIT SIGNAL */
+}
+
 bool
 Session::maybe_allow_only_loop (bool play_loop) {
 	if (!(get_play_loop () || play_loop)) {
 		return false;
 	}
 	bool rv = g_atomic_int_compare_and_exchange (&_punch_or_loop, NoConstraint, OnlyLoop);
+	if (rv) {
+		PunchLoopConstraintChange (); /* EMIT SIGNAL */
+	}
 	if (rv || loop_is_possible ()) {
 		unset_punch ();
 		return true;
@@ -1447,6 +1460,9 @@ Session::maybe_allow_only_punch () {
 		return false;
 	}
 	bool rv = g_atomic_int_compare_and_exchange (&_punch_or_loop, NoConstraint, OnlyPunch);
+	if (rv) {
+		PunchLoopConstraintChange (); /* EMIT SIGNAL */
+	}
 	return rv || punch_is_possible ();
 }
 
diff --git a/libs/ardour/session_transport.cc b/libs/ardour/session_transport.cc
index a79e39a4c2..2159a61a36 100644
--- a/libs/ardour/session_transport.cc
+++ b/libs/ardour/session_transport.cc
@@ -145,7 +145,7 @@ Session::realtime_stop (bool abort, bool clear_state)
 
 	reset_slave_state ();
 
-	g_atomic_int_set (&_punch_or_loop, NoConstraint);
+	reset_punch_loop_constraint ();
 
 	_transport_speed = 0;
 	_target_transport_speed = 0;