From: Seunggyun Kim <sgyun.kim@samsung.com>

Subject: [E-devel] [Patch] elm_genlist - added auto scroll function
when expanding items.

Now, The user don't know how many items are added when the item is expanded in tree view.
If the use want to know how many items are added, they have to scroll
genlist view.

So I added auto scroll function when the items is expanded on bottom of viewport.
Using this, the user can know expanded items although that is expanded
beyond the view port.

git-svn-id: svn+ssh://svn.enlightenment.org/var/svn/e/trunk/elementary@60302 7cbeb6ba-43b4-40fd-8cce-4c39aea84d33

diff --git a/src/lib/elm_genlist.c b/src/lib/elm_genlist.c
index 800064f..be532aa 100644 (file)
--- a/src/lib/elm_genlist.c
+++ b/src/lib/elm_genlist.c
@@ -209,7 +209,7 @@ struct _Widget_Data
    Ecore_Idle_Enterer *queue_idle_enterer;
    Ecore_Idler        *must_recalc_idler;
    Eina_List        *queue, *selected;
-   Elm_Genlist_Item *show_item, *last_selected_item, *anchor_item, *mode_item, *reorder_it, *reorder_rel;
+   Elm_Genlist_Item *show_item, *last_selected_item, *anchor_item, *mode_item, *reorder_it, *reorder_rel, *expanded_item;
    Eina_Inlist      *item_cache;
    Evas_Coord        anchor_y, reorder_start_y;
    Elm_List_Mode     mode;
@@ -237,6 +237,7 @@ struct _Widget_Data
    Eina_Bool         swipe : 1;
    Eina_Bool         reorder_mode : 1;
    Eina_Bool         reorder_pan_move : 1;
+   Eina_Bool         auto_scroll_enabled : 1;
    struct
    {
       Evas_Coord x, y;
@@ -404,6 +405,7 @@ static void      _item_move_after(Elm_Genlist_Item *it,
                                   Elm_Genlist_Item *after);
 static void      _item_move_before(Elm_Genlist_Item *it,
                                    Elm_Genlist_Item *before);
+static void      _item_auto_scroll(Widget_Data *wd);
 
 static Evas_Smart_Class _pan_sc = EVAS_SMART_CLASS_INIT_VERSION;
 
@@ -2588,7 +2590,7 @@ _calc_job(void *data)
         wd->minh = minh;
         evas_object_smart_callback_call(wd->pan_smart, "changed", NULL);
         _sizing_eval(wd->obj);
-        if ((wd->anchor_item) && (wd->anchor_item->block))
+        if ((wd->anchor_item) && (wd->anchor_item->block) && (!wd->auto_scroll_enabled))
           {
              Elm_Genlist_Item *it;
              Evas_Coord it_y;
@@ -2876,6 +2878,7 @@ _pan_calculate(Evas_Object *obj)
         sd->wd->old_pan_y = sd->wd->pan_y;
         sd->wd->start_time = ecore_loop_time_get();
      }
+   _item_auto_scroll(sd->wd);
    evas_event_thaw(evas_object_evas_get(obj));
    evas_event_thaw_eval(evas_object_evas_get(obj));
 }
@@ -3100,6 +3103,26 @@ _item_mode_unset(Widget_Data *wd)
    wd->mode_item = NULL;
 }
 
+static void
+_item_auto_scroll(Widget_Data *wd)
+{
+   if (!wd) return;
+   Elm_Genlist_Item  *it;
+   Eina_List *l;
+   Evas_Coord ox, oy, ow, oh;
+
+   if ((wd->expanded_item) && (wd->auto_scroll_enabled))
+     {
+        evas_object_geometry_get(wd->obj, &ox, &oy, &ow, &oh);
+        if (wd->expanded_item->scrl_y > (oh + oy) / 2)
+          {
+             EINA_LIST_FOREACH(wd->expanded_item->items, l, it)
+                elm_genlist_item_bring_in(it);
+          }
+        wd->auto_scroll_enabled = EINA_FALSE;
+     }
+}
+
 /**
  * Add a new Genlist object
  *
@@ -4312,17 +4335,20 @@ elm_genlist_item_expanded_set(Elm_Genlist_Item *it,
    ELM_WIDGET_ITEM_WIDTYPE_CHECK_OR_RETURN(it);
    if (it->expanded == expanded) return;
    it->expanded = expanded;
+   it->wd->expanded_item = it;
    if (it->expanded)
      {
         if (it->realized)
           edje_object_signal_emit(it->base.view, "elm,state,expanded", "elm");
         evas_object_smart_callback_call(it->base.widget, SIG_EXPANDED, it);
+        it->wd->auto_scroll_enabled = EINA_TRUE;
      }
    else
      {
         if (it->realized)
           edje_object_signal_emit(it->base.view, "elm,state,contracted", "elm");
         evas_object_smart_callback_call(it->base.widget, SIG_CONTRACTED, it);
+        it->wd->auto_scroll_enabled = EINA_FALSE;
      }
 }