edje: Add beta api for seat_data_get

Summary:
Currently this is only to help wayland CSD function correctly, so the
opaque pointer is very poorly defined.
Depends on D6116

Reviewers: zmike, cedric

Reviewed By: zmike

Tags: #efl

Differential Revision: https://phab.enlightenment.org/D6117

src/lib/edje/Edje_Common.h

@@ -2110,6 +2110,24 @@ EAPI const char *edje_object_part_object_name_get(const Evas_Object *obj);
  */
 EAPI Eina_Bool edje_3d_object_add(Evas_Object *obj, Eo **root_node, Eo *scene);
 
+/**
+ * @brief Gets seat data passed to callbacks.
+ *
+ * @return The seat data for that callback.
+ *
+ * When a callback is initiated by an input event from a seat, we try to
+ * provide seat information with it.
+ *
+ * Signals fired as programmed responses to these signals will also try
+ * to carry the seat data along.
+ *
+ * This returns an opaque pointer to the seat data.
+ *
+ * @see edje_object_signal_callback_add() for more on Edje signals.
+ * @since 1.21
+ */
+EAPI void *edje_object_signal_callback_seat_data_get(void);
+
 #endif
 
 /**

src/lib/edje/edje_program.c

@@ -1593,6 +1593,7 @@ break_prog:
 
 /* Extra data for callbacks */
 static void *callback_extra_data = NULL;
+static void *callback_seat_data = NULL;
 
 EAPI void *
 edje_object_signal_callback_extra_data_get(void)
@@ -1600,6 +1601,14 @@ edje_object_signal_callback_extra_data_get(void)
    return callback_extra_data;
 }
 
+#ifdef EFL_BETA_API_SUPPORT
+EAPI void *
+edje_object_signal_callback_seat_data_get(void)
+{
+   return callback_seat_data;
+}
+#endif
+
 /* FIXME: what if we delete the evas object??? */
 static void
 _edje_emit_cb(Edje *ed, const char *sig, const char *src, Edje_Message_Signal_Data *data, Eina_Bool prop)
@@ -1625,6 +1634,7 @@ _edje_emit_cb(Edje *ed, const char *sig, const char *src, Edje_Message_Signal_Da
         EINA_REFCOUNT_REF(m);
 
         callback_extra_data = (data) ? data->data : NULL;
+        callback_seat_data = (data) ? data->seat_data : NULL;
 
         if (eina_inarray_count(&ssp->u.callbacks.globing))
           r = edje_match_callback_exec(ssp,