elm_gengrid: fix the bug that gengrid item index(position) is updated wrong value in item_update

Summary:
elm_gengrid_item_update perform item_unrealize/item_realize/item_place itself.
But when gengrid items are added and not calculated yet,
caller want to get item's index after execute elm_gengrid_item_update,
return value is wrong because item_place update it's position in not-updated item's x and y.

to prevent this,
if item position is already updated,
do not updates position in item place.

additionally,
I fixed gengrid item prepend wrong posiiton update.
gengrid item position start from 1 not 0, so item_position_update also must be started from 1.

@fix

Test Plan:
To test this scenario,
need to fix src/bin/test_gengrid.c first.

1. add below codes in bottom of _after_bt_clicked(line 703).

```
      Elm_Object_Item *it = elm_gengrid_item_next_get(id->item);
      printf("before update efl item[%p], index [%d]\n",id->item,elm_gengrid_item_index_get(it));
      elm_gengrid_item_update(it);
      printf("after update efl item[%p], index [%d]\n",id->item,elm_gengrid_item_index_get(it));
```

2. execute elementary_test and go to gengrid2 test.

3. add 3 items and select 2nd item then add new item by insert after.

4. you can see index is changed wrong value after item_update executed.

after add fallback code in item_update,
index is returned same value even after item_update execusion.

Reviewers: raster, Hermet, seoz, jaehwan

Subscribers: anand.km, eagleeye, singh.amitesh

Differential Revision: https://phab.enlightenment.org/D2616

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>

1 files changed, 13 insertions, 5 deletions

diff --git a/src/lib/elm_gengrid.c b/src/lib/elm_gengrid.c
index c996b63ed..70f30ec7f 100644
--- a/src/lib/elm_gengrid.c
+++ b/src/lib/elm_gengrid.c
@@ -1507,7 +1507,7 @@ _item_place(Elm_Gen_Item *it,
           tch = items_row * wsd->item_height;
         alignh = (vh - tch) * wsd->align_y;
         item_pos = items_row * cx + cy + 1;
-        if (item_pos != it->position)
+        if (item_pos != it->position && !it->position_update)
           {
              it->position = item_pos;
              it->position_update = EINA_TRUE;
@@ -1540,7 +1540,7 @@ _item_place(Elm_Gen_Item *it,
           tcw = items_col * wsd->item_width;
         alignw = (vw - tcw) * wsd->align_x;
         item_pos = cx + items_col * cy + 1;
-        if (item_pos != it->position)
+        if (item_pos != it->position && !it->position_update)
           {
              it->position = item_pos;
              it->position_update = EINA_TRUE;
@@ -1604,7 +1604,10 @@ _item_place(Elm_Gen_Item *it,
      {
         _item_realize(it);
         if (!was_realized)
-          evas_object_smart_callback_call(WIDGET(it), SIG_REALIZED, EO_OBJ(it));
+          {
+             _elm_gengrid_item_index_update(it);
+             evas_object_smart_callback_call(WIDGET(it), SIG_REALIZED, EO_OBJ(it));
+          }
         if (it->parent)
           {
              if (wsd->horizontal)
@@ -1798,7 +1801,10 @@ _group_item_place(Elm_Gengrid_Pan_Data *psd)
           {
              _item_realize(it);
              if (!was_realized)
-               evas_object_smart_callback_call(WIDGET(it), SIG_REALIZED, EO_OBJ(it));
+               {
+                  _elm_gengrid_item_index_update(it);
+                  evas_object_smart_callback_call(WIDGET(it), SIG_REALIZED, EO_OBJ(it));
+               }
              evas_object_move
                (VIEW(it), GG_IT(it)->gx,
                GG_IT(it)->gy);
@@ -4285,7 +4291,7 @@ _elm_gengrid_item_prepend(Eo *obj, Elm_Gengrid_Data *sd, const Elm_Gengrid_Item_
    if (!it) return NULL;
 
    sd->items = eina_inlist_prepend(sd->items, EINA_INLIST_GET(it));
-   _item_position_update(sd->items, 0);
+   _item_position_update(sd->items, 1);
 
    if (it->group)
      sd->group_items = eina_list_append(sd->group_items, it);
@@ -4421,6 +4427,8 @@ _elm_gengrid_item_update(Eo *eo_item EINA_UNUSED, Elm_Gen_Item *it)
    _elm_gengrid_item_unrealize(it, EINA_TRUE);
    _item_realize(it);
    _item_place(it, it->x, it->y);
+
+   _elm_gengrid_item_index_update(it);
 }
 
 EOLIAN static void