diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2c21b137..2daad57c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,6 +74,7 @@ set(AWE_SRCS
     ${SOURCE_DIR}/common/xcursor.c
     ${SOURCE_DIR}/common/backtrace.c
     ${SOURCE_DIR}/common/luaobject.c
+    ${SOURCE_DIR}/common/luaclass.c
     ${SOURCE_DIR}/widgets/graph.c
     ${SOURCE_DIR}/widgets/progressbar.c
     ${SOURCE_DIR}/widgets/textbox.c
diff --git a/common/luaclass.c b/common/luaclass.c
new file mode 100644
index 00000000..3f17a3c4
--- /dev/null
+++ b/common/luaclass.c
@@ -0,0 +1,61 @@
+/*
+ * luaclass.c - useful functions for handling Lua classes
+ *
+ * Copyright © 2009 Julien Danjou <julien@danjou.info>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include "common/luaclass.h"
+#include "common/luaobject.h"
+
+void
+luaA_class_add_signal(lua_State *L, lua_class_t *lua_class,
+                      const char *name, int ud)
+{
+    luaA_checkfunction(L, ud);
+    signal_add(&lua_class->signals, name, luaA_object_ref(L, ud));
+}
+
+void
+luaA_class_remove_signal(lua_State *L, lua_class_t *lua_class,
+                         const char *name, int ud)
+{
+    luaA_checkfunction(L, ud);
+    void *ref = (void *) lua_topointer(L, ud);
+    signal_remove(&lua_class->signals, name, ref);
+    luaA_object_unref(L, (void *) ref);
+    lua_remove(L, ud);
+}
+
+void
+luaA_class_emit_signal(lua_State *L, lua_class_t *lua_class,
+                       const char *name, int nargs)
+{
+    signal_t *sigfound = signal_array_getbyid(&lua_class->signals,
+                                              a_strhash((const unsigned char *) name));
+    if(sigfound)
+        foreach(ref, sigfound->sigfuncs)
+        {
+            for(int i = 0; i < nargs; i++)
+                lua_pushvalue(L, - nargs);
+            luaA_object_push(L, (void *) *ref);
+            luaA_dofunction(L, nargs, 0);
+        }
+    lua_pop(L, nargs);
+}
+
+// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80
diff --git a/common/luaclass.h b/common/luaclass.h
new file mode 100644
index 00000000..029e87a0
--- /dev/null
+++ b/common/luaclass.h
@@ -0,0 +1,67 @@
+/*
+ * luaclass.h - useful functions for handling Lua classes
+ *
+ * Copyright © 2009 Julien Danjou <julien@danjou.info>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#ifndef AWESOME_COMMON_LUACLASS
+#define AWESOME_COMMON_LUACLASS
+
+#include "common/signal.h"
+
+typedef struct
+{
+    signal_array_t signals;
+} lua_class_t;
+
+void luaA_class_add_signal(lua_State *, lua_class_t *, const char *, int);
+void luaA_class_remove_signal(lua_State *, lua_class_t *, const char *, int);
+void luaA_class_emit_signal(lua_State *, lua_class_t *, const char *, int);
+
+#define LUA_CLASS_FUNCS(prefix, lua_class) \
+    static inline int                                                          \
+    luaA_##prefix##_class_add_signal(lua_State *L)                             \
+    {                                                                          \
+        luaA_class_add_signal(L, &(lua_class), luaL_checkstring(L, 1), 2);     \
+        return 0;                                                              \
+    }                                                                          \
+                                                                               \
+    static inline int                                                          \
+    luaA_##prefix##_class_remove_signal(lua_State *L)                          \
+    {                                                                          \
+        luaA_class_remove_signal(L, &(lua_class),                              \
+                                 luaL_checkstring(L, 1), 2);                   \
+        return 0;                                                              \
+    }                                                                          \
+                                                                               \
+    static inline int                                                          \
+    luaA_##prefix##_class_emit_signal(lua_State *L)                            \
+    {                                                                          \
+        luaA_class_emit_signal(L, &(lua_class), luaL_checkstring(L, 1),        \
+                              lua_gettop(L) - 1);                              \
+        return 0;                                                              \
+    }
+
+#define LUA_CLASS_METHODS(class) \
+    { "add_signal", luaA_##class##_class_add_signal }, \
+    { "remove_signal", luaA_##class##_class_remove_signal }, \
+    { "emit_signal", luaA_##class##_class_emit_signal },
+
+#endif
+
+// vim: filetype=c:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=80