From 2ea5962af2a389277703c6eebc2160cf52302468 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 24 Jun 2015 13:46:07 -0400
Subject: rationalize save/restore of control surface "feedback" property

---
 libs/surfaces/control_protocol/control_protocol.cc    | 13 +++++++++++++
 .../control_protocol/control_protocol.h               |  2 ++
 .../generic_midi/generic_midi_control_protocol.cc     |  7 ++-----
 libs/surfaces/mackie/mackie_control_protocol.cc       |  4 ++++
 libs/surfaces/mackie/mackie_control_protocol.h        |  7 ++++++-
 libs/surfaces/osc/osc.cc                              | 19 ++++---------------
 6 files changed, 31 insertions(+), 21 deletions(-)

diff --git a/libs/surfaces/control_protocol/control_protocol.cc b/libs/surfaces/control_protocol/control_protocol.cc
index 71cae36086..6ac673925a 100644
--- a/libs/surfaces/control_protocol/control_protocol.cc
+++ b/libs/surfaces/control_protocol/control_protocol.cc
@@ -374,6 +374,19 @@ ControlProtocol::get_state ()
 	XMLNode* node = new XMLNode (state_node_name);
 
 	node->add_property ("name", _name);
+	node->add_property ("feedback", get_feedback() ? "yes" : "no");
 
 	return *node;
 }
+
+int
+ControlProtocol::set_state (XMLNode const & node, int /* version */)
+{
+	const XMLProperty* prop;
+
+	if ((prop = node.property ("feedback")) != 0) {
+		set_feedback (string_is_affirmative (prop->value()));
+	}
+
+	return 0;
+}
diff --git a/libs/surfaces/control_protocol/control_protocol/control_protocol.h b/libs/surfaces/control_protocol/control_protocol/control_protocol.h
index f5af008e4a..13b8dcad7a 100644
--- a/libs/surfaces/control_protocol/control_protocol/control_protocol.h
+++ b/libs/surfaces/control_protocol/control_protocol/control_protocol.h
@@ -135,6 +135,8 @@ class LIBCONTROLCP_API ControlProtocol : public PBD::Stateful, public PBD::Scope
 	virtual void  tear_down_gui() { }
 
         XMLNode& get_state ();
+        int set_state (XMLNode const &, int version);
+        
         static const std::string state_node_name;
 
   protected:
diff --git a/libs/surfaces/generic_midi/generic_midi_control_protocol.cc b/libs/surfaces/generic_midi/generic_midi_control_protocol.cc
index 702d361965..85a81400c4 100644
--- a/libs/surfaces/generic_midi/generic_midi_control_protocol.cc
+++ b/libs/surfaces/generic_midi/generic_midi_control_protocol.cc
@@ -464,7 +464,6 @@ GenericMidiControlProtocol::get_state ()
 	XMLNode& node (ControlProtocol::get_state());
 	char buf[32];
 
-	node.add_property (X_("feedback"), do_feedback ? "1" : "0");
 	snprintf (buf, sizeof (buf), "%" PRIu64, _feedback_interval);
 	node.add_property (X_("feedback_interval"), buf);
 	snprintf (buf, sizeof (buf), "%d", _threshold);
@@ -501,10 +500,8 @@ GenericMidiControlProtocol::set_state (const XMLNode& node, int version)
 	XMLNodeConstIterator niter;
 	const XMLProperty* prop;
 
-	if ((prop = node.property ("feedback")) != 0) {
-		do_feedback = (bool) atoi (prop->value().c_str());
-	} else {
-		do_feedback = false;
+	if (ControlProtocol::set_state (node, version)) {
+		return -1;
 	}
 
 	if ((prop = node.property ("feedback_interval")) != 0) {
diff --git a/libs/surfaces/mackie/mackie_control_protocol.cc b/libs/surfaces/mackie/mackie_control_protocol.cc
index fc036513cc..5d6e55e742 100644
--- a/libs/surfaces/mackie/mackie_control_protocol.cc
+++ b/libs/surfaces/mackie/mackie_control_protocol.cc
@@ -827,6 +827,10 @@ MackieControlProtocol::set_state (const XMLNode & node, int version)
 	const XMLProperty* prop;
 	uint32_t bank = 0;
 
+	if (ControlProtocol::set_state (node, version)) {
+		return -1;
+	}
+	
 	if ((prop = node.property (X_("ipmidi-base"))) != 0) {
 		set_ipmidi_base (atoi (prop->value()));
 	}
diff --git a/libs/surfaces/mackie/mackie_control_protocol.h b/libs/surfaces/mackie/mackie_control_protocol.h
index 510cbf11ba..f521684a80 100644
--- a/libs/surfaces/mackie/mackie_control_protocol.h
+++ b/libs/surfaces/mackie/mackie_control_protocol.h
@@ -140,7 +140,12 @@ class MackieControlProtocol
 
 	XMLNode& get_state ();
 	int set_state (const XMLNode&, int version);
-  
+
+	/* Note: because Mackie control is inherently a duplex protocol,
+	   we do not implement get/set_feedback() since this aspect of
+	   support for the protocol is not optional.
+	*/
+	
 	static bool probe();
 	
         Glib::Threads::Mutex surfaces_lock;
diff --git a/libs/surfaces/osc/osc.cc b/libs/surfaces/osc/osc.cc
index 5878b34d80..727485d83c 100644
--- a/libs/surfaces/osc/osc.cc
+++ b/libs/surfaces/osc/osc.cc
@@ -1090,25 +1090,14 @@ OSC::route_plugin_parameter_print (int rid, int piid, int par)
 XMLNode&
 OSC::get_state ()
 {
-	XMLNode& node (ControlProtocol::get_state());
-
-	node.add_property (X_("feedback"), _send_route_changes ? "1" : "0");
-	return node;
+	return ControlProtocol::get_state();
 }
 
 int
-OSC::set_state (const XMLNode& node, int /*version*/)
+OSC::set_state (const XMLNode& node, int version)
 {
-	const XMLProperty* prop = node.property (X_("feedback"));
-
-	if (prop) {
-		if (PBD::string_is_affirmative (prop->value())) {
-			_send_route_changes = true;
-		} else {
-			_send_route_changes = false;
-		}
-	} else {
-		/* leave it alone */
+	if (ControlProtocol::set_state (node, version)) {
+		return -1;
 	}
 
 	return 0;
-- 
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