From 6f986173f3cfdf043eec34bc360915c94a9b67de Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Sun, 2 Jul 2017 15:28:51 +0200
Subject: [PATCH] Controllable focus notification API

This allows to inform control-surfaces about the current GUI
control-element. "Link" control-surface interaction to GUI focus.
---
 libs/pbd/controllable.cc    | 1 +
 libs/pbd/pbd/controllable.h | 2 ++
 2 files changed, 3 insertions(+)

diff --git a/libs/pbd/controllable.cc b/libs/pbd/controllable.cc
index 7fa1ebc063..c289ee0287 100644
--- a/libs/pbd/controllable.cc
+++ b/libs/pbd/controllable.cc
@@ -34,6 +34,7 @@ PBD::Signal1<bool,Controllable*> Controllable::StartLearning;
 PBD::Signal1<void,Controllable*> Controllable::StopLearning;
 PBD::Signal3<void,Controllable*,int,int> Controllable::CreateBinding;
 PBD::Signal1<void,Controllable*> Controllable::DeleteBinding;
+PBD::Signal1<void, boost::weak_ptr<PBD::Controllable> > Controllable::GUIFocusChanged;
 
 Glib::Threads::RWLock Controllable::registry_lock;
 Controllable::Controllables Controllable::registry;
diff --git a/libs/pbd/pbd/controllable.h b/libs/pbd/pbd/controllable.h
index da50db3b3c..6a04719637 100644
--- a/libs/pbd/pbd/controllable.h
+++ b/libs/pbd/pbd/controllable.h
@@ -130,6 +130,8 @@ class LIBPBD_API Controllable : public PBD::StatefulDestructible {
 
 	static PBD::Signal1<void,Controllable*> Destroyed;
 
+	static PBD::Signal1<void, boost::weak_ptr<PBD::Controllable> > GUIFocusChanged;
+
 	PBD::Signal2<void,bool,PBD::Controllable::GroupControlDisposition> Changed;
 
 	int set_state (const XMLNode&, int version);