From 4eea980c210c3f3bf5520c1e3d68426a4669db8a Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 25 Jun 2013 18:28:38 +0300
Subject: [PATCH] Emit a signal before changing the path of a turnout

Since changing the path is an asynchronous operation, this lets other
components react to an impending change.
---
 source/libr2c2/track.cpp | 1 +
 source/libr2c2/track.h   | 1 +
 2 files changed, 2 insertions(+)

diff --git a/source/libr2c2/track.cpp b/source/libr2c2/track.cpp
index ecb86bb..71c570c 100644
--- a/source/libr2c2/track.cpp
+++ b/source/libr2c2/track.cpp
@@ -151,6 +151,7 @@ void Track::set_active_path(unsigned p)
 	if(!(type.get_paths()&(1<<p)))
 		throw invalid_argument("Track::set_active_path");
 
+	signal_path_changing(p);
 	path_changing = true;
 	layout.get_driver().set_turnout(turnout_id, p);
 }
diff --git a/source/libr2c2/track.h b/source/libr2c2/track.h
index 168ac37..e1349a1 100644
--- a/source/libr2c2/track.h
+++ b/source/libr2c2/track.h
@@ -29,6 +29,7 @@ public:
 	};
 
 	sigc::signal<void, unsigned, Track *> signal_link_changed;
+	sigc::signal<void, unsigned> signal_path_changing;
 	sigc::signal<void, unsigned> signal_path_changed;
 
 private:
-- 
2.43.0