From e4831db229641ee88ad8a2c1e0d82d7d3442e96b Mon Sep 17 00:00:00 2001
From: David Robillard <d@drobilla.net>
Date: Tue, 8 Jan 2013 18:58:11 +0000
Subject: Add signals and default handlers for every property in conventional
 Gtkmm style.

git-svn-id: http://svn.drobilla.net/lad/trunk/ganv@4908 a436a847-0d15-0410-975c-d299462d15a1
---
 ganv/Item.hpp |  2 +-
 ganv/Node.hpp |  9 +++++++++
 ganv/wrap.hpp | 26 ++++++++++++++++----------
 3 files changed, 26 insertions(+), 11 deletions(-)

diff --git a/ganv/Item.hpp b/ganv/Item.hpp
index 1009e12..ae4cbdf 100644
--- a/ganv/Item.hpp
+++ b/ganv/Item.hpp
@@ -81,7 +81,7 @@ private:
 	              GdkEvent* ev,
 	              void*     item)
 	{
-		return ((Item*)item)->on_event(ev);
+		return ((Item*)item)->signal_event().emit(ev);
 	}
 };
 
diff --git a/ganv/Node.hpp b/ganv/Node.hpp
index fb1c1be..c9aaa63 100644
--- a/ganv/Node.hpp
+++ b/ganv/Node.hpp
@@ -38,6 +38,8 @@ public:
 		: Item(GANV_ITEM(g_object_ref(gobj)))
 	{
 		g_signal_connect(gobj, "moved", G_CALLBACK(on_moved), this);
+		CONNECT_PROP_SIGNAL(gobj, selected,
+		                    on_notify<gboolean>, &Node::on_selected)
 	}
 
 	~Node() {
@@ -83,6 +85,13 @@ private:
 	static void on_moved(GanvNode* node, double x, double y) {
 		Glib::wrap(node)->_signal_moved.emit(x, y);
 	}
+
+	template<typename T>
+	static void on_notify(GObject* gobj, GParamSpec* pspec, gpointer signal) {
+		T value;
+		g_object_get(gobj, g_param_spec_get_name(pspec), &value, NULL);
+		((sigc::signal<bool, T>*)signal)->emit(value);
+	}
 };
 
 } // namespace Ganv
diff --git a/ganv/wrap.hpp b/ganv/wrap.hpp
index d29740e..d0cdfa4 100644
--- a/ganv/wrap.hpp
+++ b/ganv/wrap.hpp
@@ -17,6 +17,19 @@
 #define GANV_WRAP_HPP
 
 #include <glib.h>
+
+#define CONNECT_PROP_SIGNAL(gobj, name, notify, handler) \
+	g_signal_connect(gobj, "notify::" #name, \
+	                 G_CALLBACK(notify), &_signal_##name); \
+	_signal_##name.connect(sigc::mem_fun(this, handler));
+
+#define SIGNAL1(name, argtype) \
+public: \
+	virtual bool on_##name(argtype arg) { return true; } \
+	sigc::signal<bool, argtype>& signal_##name() { return _signal_##name; } \
+private: \
+	sigc::signal<bool, argtype> _signal_##name;
+
 #define RW_PROPERTY(type, name) \
 	virtual type get_##name() const { \
 		type value; \
@@ -25,7 +38,9 @@
 	} \
 	virtual void set_##name(type value) { \
 		g_object_set(G_OBJECT(_gobj), #name, value, NULL); \
-	}
+	} \
+	SIGNAL1(name, type) \
+	public:
 
 #define RW_OBJECT_PROPERTY(type, name) \
 	type get_##name() const { \
@@ -75,15 +90,6 @@
 		prefix##_##name(gobj(), a1, a2, a3); \
 	}
 
-#define SIGNAL1(name, argtype) \
-public: \
-	virtual bool on_##name(argtype arg) { \
-		return _signal_##name.emit(arg); \
-	} \
-	sigc::signal<bool, argtype>& signal_##name() { return _signal_##name; } \
-private: \
-	sigc::signal<bool, argtype> _signal_##name;
-
 #define GANV_GLIB_WRAP(Name) \
 	namespace Ganv { \
 	class Name; \
-- 
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