From 0f4530af0d3fbd0d37879c9c15814b63abd47aa9 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 1 Feb 2017 11:46:42 +0100
Subject: add new API to ControlProtocol to allow GUI to specify left-most
 mixer strip

Subject To Change. Mileage May Vary. Offer Not Good In All Territories.
---
 libs/surfaces/control_protocol/control_protocol.cc | 22 ++++++++++++++++++----
 .../control_protocol/control_protocol.h            |  6 +++++-
 2 files changed, 23 insertions(+), 5 deletions(-)

diff --git a/libs/surfaces/control_protocol/control_protocol.cc b/libs/surfaces/control_protocol/control_protocol.cc
index 8c2a121779..675294bbd9 100644
--- a/libs/surfaces/control_protocol/control_protocol.cc
+++ b/libs/surfaces/control_protocol/control_protocol.cc
@@ -57,7 +57,7 @@ PBD::Signal0<void>          ControlProtocol::ClearStripableSelection;
 
 PBD::Signal1<void,StripableNotificationListPtr> ControlProtocol::StripableSelectionChanged;
 
-Glib::Threads::Mutex ControlProtocol::first_selected_mutex;
+Glib::Threads::Mutex ControlProtocol::special_stripable_mutex;
 boost::weak_ptr<Stripable> ControlProtocol::_first_selected_stripable;
 StripableNotificationList ControlProtocol::_last_selected;
 bool ControlProtocol::selection_connected = false;
@@ -346,14 +346,28 @@ ControlProtocol::set_state (XMLNode const & node, int /* version */)
 boost::shared_ptr<Stripable>
 ControlProtocol::first_selected_stripable ()
 {
-	Glib::Threads::Mutex::Lock lm (first_selected_mutex);
+	Glib::Threads::Mutex::Lock lm (special_stripable_mutex);
 	return _first_selected_stripable.lock();
 }
 
+boost::shared_ptr<Stripable>
+ControlProtocol::leftmost_mixer_stripable ()
+{
+	Glib::Threads::Mutex::Lock lm (special_stripable_mutex);
+	return _first_selected_stripable.lock();
+}
+
+void
+ControlProtocol::set_leftmost_mixer_stripable (boost::shared_ptr<Stripable> s)
+{
+	Glib::Threads::Mutex::Lock lm (special_stripable_mutex);
+	_first_selected_stripable = s;
+}
+
 void
 ControlProtocol::set_first_selected_stripable (boost::shared_ptr<Stripable> s)
 {
-	Glib::Threads::Mutex::Lock lm (first_selected_mutex);
+	Glib::Threads::Mutex::Lock lm (special_stripable_mutex);
 	_first_selected_stripable = s;
 }
 
@@ -365,7 +379,7 @@ ControlProtocol::stripable_selection_changed (StripableNotificationListPtr sp)
 	_last_selected = *sp;
 
 	{
-		Glib::Threads::Mutex::Lock lm (first_selected_mutex);
+		Glib::Threads::Mutex::Lock lm (special_stripable_mutex);
 
 		if (!_last_selected.empty()) {
 			if (!had_selection) {
diff --git a/libs/surfaces/control_protocol/control_protocol/control_protocol.h b/libs/surfaces/control_protocol/control_protocol/control_protocol.h
index 2485ca84ac..987a8bcac4 100644
--- a/libs/surfaces/control_protocol/control_protocol/control_protocol.h
+++ b/libs/surfaces/control_protocol/control_protocol/control_protocol.h
@@ -95,6 +95,9 @@ class LIBCONTROLCP_API ControlProtocol : public PBD::Stateful, public PBD::Scope
 	static boost::shared_ptr<ARDOUR::Stripable> first_selected_stripable ();
 	static void set_first_selected_stripable (boost::shared_ptr<ARDOUR::Stripable>);
 
+	static boost::shared_ptr<ARDOUR::Stripable> leftmost_mixer_stripable ();
+	static void set_leftmost_mixer_stripable (boost::shared_ptr<ARDOUR::Stripable>);
+
 	/* the model here is as follows:
 
 	   we imagine most control surfaces being able to control
@@ -156,7 +159,8 @@ class LIBCONTROLCP_API ControlProtocol : public PBD::Stateful, public PBD::Scope
         bool _active;
 
 
-        static Glib::Threads::Mutex first_selected_mutex;
+        static Glib::Threads::Mutex special_stripable_mutex;
+        static boost::weak_ptr<ARDOUR::Stripable> _leftmost_mixer_stripable;
         static boost::weak_ptr<ARDOUR::Stripable> _first_selected_stripable;
         static StripableNotificationList _last_selected;
         static void stripable_selection_changed (StripableNotificationListPtr);
-- 
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