From d53993fd834ef6b12f9e3acab43325783fa98784 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 25 Nov 2015 16:47:20 -0500
Subject: [PATCH] faderport: output button is a toggle between master (or
 monitor) and currently used route

---
 libs/surfaces/faderport/faderport.h   |  3 +++
 libs/surfaces/faderport/operations.cc | 21 +++++++++++++++++++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/libs/surfaces/faderport/faderport.h b/libs/surfaces/faderport/faderport.h
index 5fe657c704..d733012ea7 100644
--- a/libs/surfaces/faderport/faderport.h
+++ b/libs/surfaces/faderport/faderport.h
@@ -103,6 +103,9 @@ class FaderPort : public ARDOUR::ControlProtocol, public AbstractUI<FaderPortReq
 
   private:
 	boost::shared_ptr<ARDOUR::Route> _current_route;
+	boost::weak_ptr<ARDOUR::Route> pre_master_route;
+	boost::weak_ptr<ARDOUR::Route> pre_monitor_route;
+
 	boost::shared_ptr<ARDOUR::AsyncMIDIPort> _input_port;
 	boost::shared_ptr<ARDOUR::AsyncMIDIPort> _output_port;
 
diff --git a/libs/surfaces/faderport/operations.cc b/libs/surfaces/faderport/operations.cc
index 01b555f575..1fb2810b3a 100644
--- a/libs/surfaces/faderport/operations.cc
+++ b/libs/surfaces/faderport/operations.cc
@@ -17,6 +17,7 @@
 
 */
 
+#include "ardour/async_midi_port.h"
 #include "ardour/rc_configuration.h"
 #include "ardour/session.h"
 #include "ardour/track.h"
@@ -91,7 +92,15 @@ FaderPort::use_master ()
 {
 	boost::shared_ptr<Route> r = session->master_out();
 	if (r) {
-		set_current_route (r);
+		if (_current_route == r) {
+			r = pre_master_route.lock();
+			set_current_route (r);
+			button_info(Output).set_led_state (_output_port, false);
+		} else {
+			pre_master_route = boost::weak_ptr<Route> (_current_route);
+			set_current_route (r);
+			button_info(Output).set_led_state (_output_port, true);
+		}
 	}
 }
 
@@ -100,6 +109,14 @@ FaderPort::use_monitor ()
 {
 	boost::shared_ptr<Route> r = session->monitor_out();
 	if (r) {
-		set_current_route (r);
+		if (_current_route == r) {
+			r = pre_monitor_route.lock();
+			set_current_route (r);
+			button_info(Output).set_led_state (_output_port, false);
+		} else {
+			pre_monitor_route = boost::weak_ptr<Route> (_current_route);
+			set_current_route (r);
+			button_info(Output).set_led_state (_output_port, true);
+		}
 	}
 }