edje_embryo: add function to know swallow has object

Summary:
Using edc script, there is no way to know evas object is set on swallow part or not.
So, to know that, some elm widget send signal and save some information to edc variables when object is set on swallow part.
I think it is helpful to make better edc script.

@feature

Reviewers: herb, cedric, raster, id213sin, jpeg

Reviewed By: jpeg

Subscribers: jpeg

Differential Revision: https://phab.enlightenment.org/D4176

data/edje/include/edje.inc

@@ -329,3 +329,4 @@ enum Anim_Param
 
 native       set_tween_state_anim  (part_id, state1[], Float:state1_val, state2[], Float:state2_val, Anim_Param:p, Float:tween, ...);
 native       set_state_anim  (part_id, state[], Float:state1_val, Anim_Param:p, Float:tween, ...);
+native       swallow_has_content (part_id);

src/lib/edje/edje_embryo.c

@@ -4391,6 +4391,30 @@ _edje_embryo_fn_physics_get_rotation(Embryo_Program *ep, Embryo_Cell *params)
 
 #endif
 
+/* swallow_has_content(part_id) */
+static Embryo_Cell
+_edje_embryo_fn_swallow_has_content(Embryo_Program *ep, Embryo_Cell *params)
+{
+   Edje *ed;
+   int part_id = 0;
+   Edje_Real_Part *rp;
+
+   CHKPARAM(1);
+   ed = embryo_program_data_get(ep);
+   part_id = params[1];
+   if (part_id < 0) return 0;
+   rp = ed->table_parts[part_id % ed->table_parts_size];
+
+   if ((!rp) ||
+       (!rp->part) ||
+       (rp->part->type != EDJE_PART_TYPE_SWALLOW) ||
+       (!rp->typedata.swallow) ||
+       (!rp->typedata.swallow->swallowed_object))
+      return 0;
+
+   return 1;
+}
+
 void
 _edje_embryo_script_init(Edje_Part_Collection *edc)
 {
@@ -4516,6 +4540,8 @@ _edje_embryo_script_init(Edje_Part_Collection *edc)
    embryo_program_native_call_add(ep, "physics_set_rotation", _edje_embryo_fn_physics_set_rotation);
    embryo_program_native_call_add(ep, "physics_get_rotation", _edje_embryo_fn_physics_get_rotation);
 #endif
+
+   embryo_program_native_call_add(ep, "swallow_has_content", _edje_embryo_fn_swallow_has_content);
 }
 
 void