edje: add edje_color_class_active_iterator_new()

This function make it possible to get a list of active Edje_Color_Class
in an application. Think about Enlightenment color class configuration,
but can now be done on any application dynamically.

@feature

src/lib/edje/Edje_Common.h

@@ -1260,6 +1260,16 @@ EAPI void         edje_color_class_del            (const char *color_class);
  */
 EAPI Eina_List   *edje_color_class_list           (void);
 
+/**
+ * @brief Iterate over all the active class of an application.
+ *
+ * @return Return an iterator of Edje_Color_Class of the currently active color class
+ *
+ * This function only iterate over the Edje_Color_Class in use by
+ * an application.
+ */
+EAPI Eina_Iterator *edje_color_class_active_iterator_new(void);
+
 /**
  * @}
  */

src/lib/edje/edje_util.c

@@ -653,6 +653,104 @@ edje_color_class_list(void)
    return fdata.list;
 }
 
+typedef struct _Edje_Active_Color_Class_Iterator Edje_Active_Color_Class_Iterator;
+struct _Edje_Active_Color_Class_Iterator
+{
+   Eina_Iterator iterator;
+
+   Edje_Color_Class cc;
+
+   Eina_Iterator *classes;
+};
+
+static Eina_Bool
+_edje_color_class_active_iterator_next(Eina_Iterator *it, void **data)
+{
+   Edje_Active_Color_Class_Iterator *et = (void*) it;
+   Eina_Hash_Tuple *tuple = NULL;
+   Edje_Refcount *er = NULL;
+   Eina_Iterator *ith;
+   Edje_Color_Class *cc;
+   int r, g, b, a;
+   int r2, g2, b2, a2;
+   int r3, g3, b3, a3;
+
+   if (!eina_iterator_next(et->classes, (void**) &tuple)) return EINA_FALSE;
+   if (!tuple) return EINA_FALSE;
+
+   if (!edje_color_class_get(tuple->key,
+                             &r, &g, &b, &a,
+                             &r2, &g2, &b2, &a2,
+                             &r3, &g3, &b3, &a3))
+     return EINA_FALSE;
+
+   /*
+     Any of the Edje object referenced should have a file with a valid
+     description for this color class. Let's bet on that for now.
+   */
+   ith = eina_hash_iterator_data_new(tuple->data);
+   if (!eina_iterator_next(ith, (void**) &er)) return EINA_FALSE;
+   cc = eina_hash_find(er->ed->file->color_hash, tuple->key);
+   if (!cc) return EINA_FALSE;
+
+   /*
+     Now set the value of a fake color class with current value as set
+     and description from edc.
+   */
+   et->cc.name = tuple->key;
+   et->cc.desc = cc->desc;
+   et->cc.r = r;
+   et->cc.g = g;
+   et->cc.b = b;
+   et->cc.a = a;
+   et->cc.r2 = r2;
+   et->cc.g2 = g2;
+   et->cc.b2 = b2;
+   et->cc.a2 = a2;
+   et->cc.r3 = r3;
+   et->cc.g3 = g3;
+   et->cc.b3 = b3;
+   et->cc.a3 = a3;
+
+   *data = &et->cc;
+   return EINA_TRUE;
+}
+
+static void *
+_edje_color_class_active_iterator_container(Eina_Iterator *it EINA_UNUSED)
+{
+   return NULL;
+}
+
+static void
+_edje_color_class_active_iterator_free(Eina_Iterator *it)
+{
+   Edje_Active_Color_Class_Iterator *et = (void*) it;
+
+   eina_iterator_free(et->classes);
+   EINA_MAGIC_SET(&et->iterator, 0);
+   free(et);
+}
+
+EAPI Eina_Iterator *
+edje_color_class_active_iterator_new(void)
+{
+   Edje_Active_Color_Class_Iterator *it;
+
+   it = calloc(1, sizeof (Edje_Active_Color_Class_Iterator));
+   if (!it) return NULL;
+
+   EINA_MAGIC_SET(&it->iterator, EINA_MAGIC_ITERATOR);
+   it->classes = eina_hash_iterator_tuple_new(_edje_color_class_member_hash);
+
+   it->iterator.version = EINA_ITERATOR_VERSION;
+   it->iterator.next = _edje_color_class_active_iterator_next;
+   it->iterator.get_container = _edje_color_class_active_iterator_container;
+   it->iterator.free = _edje_color_class_active_iterator_free;
+
+   return &it->iterator;
+}
+
 static Eina_Bool
 _edje_color_class_list_foreach(const Eina_Hash *hash EINA_UNUSED, const void *key, void *data EINA_UNUSED, void *fdata)
 {