combobox: prevent empty swallow to be shown on hover_dismiss animation

Summary:
Hover dismiss animation takes 0.5 sec to complete. if the genlist item_count
becomes zero, empty swallow is shown in dismiss animation.
@fix T3124
Signed-off-by: divyesh purohit <div.purohit@samsung.com>

Test Plan:
please run combobox example from elementary_test.

Open hover by pressing on left side button of combobox or pressing "enter/space" key in entry
contained in combobox.
Type a char which is not in any genlist item , for example "a' is not presented in any genlist
item.
empty swallow shouldn't seen in dismiss animation.

Reviewers: shilpasingh, cedric, raster

Subscribers: rajeshps, govi

Maniphest Tasks: T3124

Differential Revision: https://phab.enlightenment.org/D3630

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

legacy/elementary/data/themes/edc/elm/hover.edc

@@ -692,6 +692,12 @@ group { name: "elm/hover/base/hoversel_vertical/default";
          target: "base";
          after: "hidefinished";
       }
+      program { name: "hide_no_animate";
+         signal: "elm,action,hide,no_animate"; source: "elm";
+         action: STATE_SET "default" 0.0;
+         target: "base";
+         after: "hidefinished";
+      }
       program { name: "hidefinished";
          script {
             set_int(on_dismiss, 0);

legacy/elementary/src/lib/elc_combobox.c

@@ -147,7 +147,6 @@ _table_resize(void *data)
      {
         int hover_parent_w, hover_parent_h, obj_h, obj_w, obj_y, win_y_offset;
         int current_height, h;
-        const char *best_location;
         sd->item = elm_genlist_first_item_get(sd->genlist);
         //FIXME:- the height of item is zero, sometimes.
         evas_object_geometry_get(elm_object_item_track(sd->item), NULL, NULL,
@@ -158,9 +157,9 @@ _table_resize(void *data)
         evas_object_geometry_get(sd->hover_parent, NULL, NULL, &hover_parent_w,
                                  &hover_parent_h);
         current_height = sd->item_height * sd->count;
-        best_location = elm_hover_best_content_location_get(sd->hover,
+        sd->best_location = elm_hover_best_content_location_get(sd->hover,
                                                        ELM_HOVER_AXIS_VERTICAL);
-        if (best_location && !strcmp(best_location , "bottom"))
+        if (sd->best_location && !strcmp(sd->best_location , "bottom"))
           win_y_offset = hover_parent_h - obj_y - obj_h;
         else win_y_offset = obj_y;
 
@@ -177,15 +176,19 @@ _activate(Evas_Object *obj)
 {
    ELM_COMBOBOX_DATA_GET(obj, sd);
    if (elm_widget_disabled_get(obj)) return;
+
    if (sd->expanded)
      {
         elm_combobox_hover_end(obj);
         return;
      }
+
    sd->expanded = EINA_TRUE;
+
+   if (sd->count <= 0) return;
+
    _table_resize(obj);
-   elm_object_part_content_set(sd->hover, elm_hover_best_content_location_get
-                               (sd->hover, ELM_HOVER_AXIS_VERTICAL), sd->tbl);
+   elm_object_part_content_set(sd->hover, sd->best_location, sd->tbl);
    evas_object_show(sd->genlist);
    elm_genlist_item_selected_set(sd->item, EINA_TRUE);
    evas_object_show(sd->hover);
@@ -210,6 +213,7 @@ static Eina_Bool
 _gl_filter_finished_cb(void *data, Eo *obj EINA_UNUSED,
                        const Eo_Event_Description *desc EINA_UNUSED, void *event)
 {
+   char buf[1024];
    ELM_COMBOBOX_DATA_GET(data, sd);
 
    count_items_genlist(data);
@@ -226,9 +230,17 @@ _gl_filter_finished_cb(void *data, Eo *obj EINA_UNUSED,
      {
         if (!sd->expanded) _activate(data);
         else _table_resize(data);
+        elm_genlist_item_selected_set(sd->item, EINA_TRUE);
      }
-   else elm_combobox_hover_end(data);
-   elm_genlist_item_selected_set(sd->item, EINA_TRUE);
+   else 
+     {
+        sd->expanded = EINA_FALSE;
+        elm_layout_signal_emit(sd->hover, "elm,action,hide,no_animate", "elm");
+        snprintf(buf, sizeof(buf), "elm,action,slot,%s,hide", sd->best_location);
+        elm_layout_signal_emit(sd->hover, buf, "elm");
+        edje_object_message_signal_process(elm_layout_edje_get(sd->hover));
+     }
+
    return EINA_TRUE;
 }
 

legacy/elementary/src/lib/elm_widget_combobox.h

@@ -35,6 +35,7 @@ struct _Elm_Combobox_Data
    Evas_Object          *spacer;
    Elm_Object_Item      *item;
    const char           *style;
+   const char           *best_location;
    int                   count;
    int                   item_height;
    Eina_Bool             expanded:1;