edje: implement container api

the container api returns the number of added swallows.
the content iterator returns a iterator over all swallowed objects.

The reason this is only for swallows is that the interface explicitly
mentions UI elements at the count. Since i am believing the the result
of the count operation should mirror to the amount of elements in the
iterator, the iterator only returns swallowed objects.

ref T5719

Reviewed-by: Cedric BAIL <cedric.bail@free.fr>
Differential Revision: https://phab.enlightenment.org/D7748

src/lib/edje/edje_util.c

@@ -3397,6 +3397,82 @@ _efl_canvas_layout_efl_container_content_remove(Eo *obj EINA_UNUSED, Edje *ed, E
    return EINA_TRUE;
 }
 
+typedef struct _Content_Part_Iterator Content_Part_Iterator;
+struct _Content_Part_Iterator
+{
+   Eina_Iterator  iterator;
+   Eo            *object;
+   Edje          *ed;
+   unsigned       index;
+};
+
+static Eina_Bool
+_content_part_iterator_next(Content_Part_Iterator *it, void **data)
+{
+   for (; it->index < it->ed->table_parts_size; it->index++)
+     {
+        Edje_Real_Part *rp = it->ed->table_parts[it->index];
+        if (rp->part && rp->part->type == EDJE_PART_TYPE_SWALLOW)
+          {
+             if (data) *data = (void*) rp->typedata.swallow->swallowed_object;
+             it->index++;
+             return EINA_TRUE;
+          }
+     }
+
+   return EINA_FALSE;
+}
+
+static Eo *
+_content_part_iterator_get_container(Content_Part_Iterator *it)
+{
+   return it->object;
+}
+
+static void
+_content_part_iterator_free(Content_Part_Iterator *it)
+{
+   free(it);
+}
+
+EOLIAN Eina_Iterator*
+_efl_canvas_layout_efl_container_content_iterate(Eo *obj, Edje *ed)
+{
+   Content_Part_Iterator *it;
+
+   it = calloc(1, sizeof(*it));
+   if (!it) return NULL;
+
+   EINA_MAGIC_SET(&it->iterator, EINA_MAGIC_ITERATOR);
+
+   it->iterator.version = EINA_ITERATOR_VERSION;
+   it->iterator.next = FUNC_ITERATOR_NEXT(_content_part_iterator_next);
+   it->iterator.get_container = FUNC_ITERATOR_GET_CONTAINER(_content_part_iterator_get_container);
+   it->iterator.free = FUNC_ITERATOR_FREE(_content_part_iterator_free);
+   it->object = obj;
+   it->ed = ed;
+   it->index = 0;
+
+   return &it->iterator;
+}
+
+EOLIAN int
+_efl_canvas_layout_efl_container_content_count(Eo *obj EINA_UNUSED, Edje *pd)
+{
+   Edje_Real_Part *rp;
+   int result = 0;
+
+   for (int i = 0; i < pd->table_parts_size; ++i)
+     {
+        rp = pd->table_parts[i];
+        if (rp->part && rp->part->type == EDJE_PART_TYPE_SWALLOW)
+          result ++;
+     }
+
+   return result;
+}
+
+
 Efl_Gfx_Entity *
 _edje_efl_content_content_get(Edje *ed, const char *part)
 {

src/lib/edje/efl_canvas_layout.eo

@@ -116,6 +116,8 @@ class Efl.Canvas.Layout extends Efl.Canvas.Group implements Efl.File, Efl.Contai
       Efl.File.load_error { get; }
       Efl.File.mmap { get; set; }
       Efl.Container.content_remove;
+      Efl.Container.content_iterate;
+      Efl.Container.content_count;
       Efl.Part.part_get; [[Returns @Efl.Canvas.Layout_Part]]
       Efl.Observer.update;
       Efl.Player.playable { get; }

src/tests/edje/edje_test_swallow.c

@@ -123,6 +123,39 @@ EFL_START_TEST(edje_test_swallows_eoapi)
 }
 EFL_END_TEST
 
+EFL_START_TEST(edje_test_swallows_container_api)
+{
+   Evas *evas = _setup_evas();
+   Evas_Object *ly, *o1;
+
+   ly = efl_add(EFL_CANVAS_LAYOUT_CLASS, evas);
+   fail_unless(edje_object_file_set(ly, test_layout_get("test_swallows.edj"), "test_group"));
+
+   fail_unless(edje_object_part_exists(ly, "swallow"));
+
+   o1 = efl_add(EFL_CANVAS_LAYOUT_CLASS, ly);
+   fail_if(!efl_content_set(efl_part(ly, "swallow"), o1));
+
+   ck_assert_int_eq(efl_content_count(ly), 1);
+
+   {
+      Eina_Array *arr = eina_array_new(1);
+      Eina_Iterator *iter = efl_content_iterate(ly);
+      Eo *content;
+
+      EINA_ITERATOR_FOREACH(iter, content)
+        {
+           eina_array_push(arr, content);
+        }
+
+      ck_assert_int_eq(eina_array_count(arr), 1);
+      ck_assert_ptr_eq(eina_array_data_get(arr, 0), o1);
+      eina_array_free(arr);
+   }
+
+   evas_free(evas);
+}
+EFL_END_TEST
 
 void edje_test_swallow(TCase *tc)
 {
@@ -130,4 +163,5 @@ void edje_test_swallow(TCase *tc)
    tcase_add_test(tc, edje_test_swallows_lifetime);
    tcase_add_test(tc, edje_test_swallows_invalidate);
    tcase_add_test(tc, edje_test_swallows_eoapi);
+   tcase_add_test(tc, edje_test_swallows_container_api);
 }