edje: Remove message_handler_set from EO

It is used to receive messages with a payload from embryo to C.
This API has a function pointer, which means it would have to be
manually bound, or transformed (eg. eo event).

Also, prepare the change for message_send to use Eina_Value and
no explicit type.

This feature seems rarely used.

But note that handler_set is in fact used in terminology, rage and
luncher. So, if the need arises, it will have to be transformed in
a proper EO way.

src/lib/edje/Edje_Legacy.h

@@ -97,6 +97,45 @@ EAPI void        *edje_object_signal_callback_del (Evas_Object *obj, const char
  */
 EAPI void        *edje_object_signal_callback_del_full(Evas_Object *obj, const char *emission, const char *source, Edje_Signal_Cb func, void *data);
 
+/**
+ * @brief Sets an Edje message handler function for a given Edje object.
+ *
+ * For scriptable programs on an Edje object's defining EDC file which send
+ * messages with the send_message() primitive, one can attach handler
+ * functions, to be called in the code which creates that object (see @ref
+ * edcref "the syntax" for EDC files).
+ *
+ * This function associates a message handler function and the attached data
+ * pointer to the object obj.
+ *
+ * See also @ref edje_object_message_send()
+ *
+ * @param[in] func The function to handle messages  coming from obj
+ * @param[in] data Auxiliary data to be passed to func
+ */
+EAPI void edje_object_message_handler_set(Edje_Object *obj, Edje_Message_Handler_Cb func, void *data);
+
+/**
+ * @brief Sends an (Edje) message to a given Edje object
+ *
+ * This function sends an Edje message to obj and to all of its child objects,
+ * if it has any (swallowed objects are one kind of child object). type and msg
+ *  must be matched accordingly, as documented in #Edje_Message_Type.
+ *
+ * The id argument as a form of code and theme defining a common interface on
+ * message communication. One should define the same IDs on both code and EDC
+ * declaration (see @ref edcref "the syntax" for EDC files), to individualize
+ * messages (binding them to a given context).
+ *
+ * The function to handle messages arriving  from obj is set with
+ * edje_object_message_handler_set().
+ *
+ * @param[in] type The type of message to send to obj
+ * @param[in] id A identification number for the message to be sent
+ * @param[in] msg The message's body, a struct depending on type
+ */
+EAPI void edje_object_message_send(Edje_Object *obj, Edje_Message_Type type, int id, void *msg);
+
  /**
  * @deprecated use evas_object_size_hint_min_set() instead.
  * @brief Sets the object minimum size.

src/lib/edje/edje_message_queue.c

@@ -32,15 +32,9 @@ _edje_object_message_popornot_send(Evas_Object *obj, Edje_Message_Type type, int
 }
 
 EOLIAN void
-_edje_object_message_send(Eo *obj, Edje *_pd EINA_UNUSED, Edje_Message_Type type, int id, void *msg)
+_edje_object_message_send(Eo *obj, Edje *pd EINA_UNUSED, int id, const Eina_Value *val)
 {
-   _edje_object_message_popornot_send(obj, type, id, msg, EINA_FALSE);
-}
-
-EOLIAN void
-_edje_object_message_handler_set(Eo *obj EINA_UNUSED, Edje *ed, Edje_Message_Handler_Cb func, void *data)
-{
-   _edje_message_cb_set(ed, func, data);
+   /* TODO */
 }
 
 EOLIAN void
@@ -129,12 +123,6 @@ end:
      tmp_msgq_restart = 1;
 }
 
-EAPI void
-edje_message_signal_process(void)
-{
-   _edje_message_queue_process();
-}
-
 static Eina_Bool
 _edje_dummy_timer(void *data EINA_UNUSED)
 {
@@ -887,3 +875,26 @@ _edje_message_del(Edje *ed)
      }
 }
 
+/* Legacy EAPI */
+
+EAPI void
+edje_object_message_send(Eo *obj, Edje_Message_Type type, int id, void *msg)
+{
+   _edje_object_message_popornot_send(obj, type, id, msg, EINA_FALSE);
+}
+
+EAPI void
+edje_message_signal_process(void)
+{
+   _edje_message_queue_process();
+}
+
+EAPI void
+edje_object_message_handler_set(Eo *obj, Edje_Message_Handler_Cb func, void *data)
+{
+   Edje *ed;
+
+   ed = _edje_fetch(obj);
+   if (!ed) return;
+   _edje_message_cb_set(ed, func, data);
+}

src/lib/edje/edje_object.eo

@@ -461,25 +461,6 @@ class Edje.Object (Efl.Canvas.Group.Clipped, Efl.File, Efl.Container, Efl.Part,
             key: string; [[The data field's key string]]
          }
       }
-      @property message_handler {
-         set {
-            [[Sets an Edje message handler function for a given Edje object.
-
-              For scriptable programs on an Edje object's defining EDC file which
-              send messages with the send_message() primitive, one can attach
-              handler functions, to be called in the code which creates
-              that object (see \@ref edcref "the syntax" for EDC files).
-
-              This function associates a message handler function and the
-              attached data pointer to the object obj.
-
-              See also @.message_send()]]
-         }
-         values {
-            func: Edje.Message_Handler_Cb; [[The function to handle messages  coming from obj]]
-            data: void_ptr; [[Auxiliary data to be passed to func]]
-         }
-      }
       message_send {
          [[Sends an (Edje) message to a given Edje object
 
@@ -498,10 +479,10 @@ class Edje.Object (Efl.Canvas.Group.Clipped, Efl.File, Efl.Container, Efl.Part,
            edje_object_message_handler_set().]]
 
          params {
-            @in type: Edje.Message_Type; [[The type of message to send to obj]]
             @in id: int; [[A identification number for the message to be sent]]
-            @in msg: void_ptr; [[The message's body, a struct depending on type]]
+            @in msg: const(generic_value); [[The message's payload]]
          }
+         legacy: null;
       }
       signal_callback_add {
          [[Adds a callback for an arriving Edje signal, emitted by