efl_ui_position_manager: a way to announce new entities

there are situations where the entity is not ready yet when the initial
placing does happen. With this API you can tell the position manager
that the placing of the items can be reapplied at the entities are
availble now.

Differential Revision: https://phab.enlightenment.org/D9947

src/lib/elementary/efl_ui_position_manager_entity.eo

@@ -91,6 +91,16 @@ interface @beta Efl.Ui.Position_Manager.Entity extends Efl.Ui.Layout_Orientable
           end_id : int; [[The last item that has a new size]]
         }
       }
+      entities_ready {
+        [[The items from $start_id to $end_id now have their entities ready
+
+          The position manager will reapply the geometry to the elements if they are visible.
+        ]]
+        params {
+          start_id : uint; [[The first item that is available]]
+          end_id : uint; [[The last item that is available]]
+        }
+      }
       relative_item {
         [[Translates the $current_id, into a new id which is oriented in the $direction of $current_id.
           In case that there is no item, -1 is returned]]

src/lib/elementary/efl_ui_position_manager_grid.c

@@ -19,6 +19,7 @@ typedef struct {
    Eina_Vector2 scroll_position;
    Efl_Ui_Layout_Orientation dir;
    Vis_Segment prev_run;
+   unsigned int prev_consumed_space;
    Eina_Size2D max_min_size;
    Eina_Size2D last_viewport_size;
    Eina_Size2D prev_min_size;
@@ -491,6 +492,7 @@ _reposition_content(Eo *obj EINA_UNUSED, Efl_Ui_Position_Manager_Grid_Data *pd)
      {
         ev.start_id = pd->prev_run.start_id = cur.start_id;
         ev.end_id = pd->prev_run.end_id = cur.end_id;
+        pd->prev_consumed_space = consumed_space;
         efl_event_callback_call(obj, EFL_UI_POSITION_MANAGER_ENTITY_EVENT_VISIBLE_RANGE_CHANGED, &ev);
      }
 }
@@ -809,5 +811,46 @@ _efl_ui_position_manager_grid_efl_object_finalize(Eo *obj, Efl_Ui_Position_Manag
    return obj;
 }
 
+EOLIAN static void
+_efl_ui_position_manager_grid_efl_ui_position_manager_entity_entities_ready(Eo *obj, Efl_Ui_Position_Manager_Grid_Data *pd, unsigned int start_id, unsigned int end_id)
+{
+   Eina_Size2D space_size;
+   int relevant_space_size;
+   Item_Position_Context ctx;
+
+   if (end_id < pd->prev_run.start_id || start_id > pd->prev_run.end_id)
+     return;
+
+   space_size.w = (MAX(pd->last_viewport_size.w - pd->viewport.w, 0))*pd->scroll_position.x;
+   space_size.h = (MAX(pd->last_viewport_size.h - pd->viewport.h, 0))*pd->scroll_position.y;
+
+   if (pd->dir == EFL_UI_LAYOUT_ORIENTATION_VERTICAL)
+     {
+        relevant_space_size = space_size.h;
+     }
+   else
+     {
+        relevant_space_size = space_size.w;
+     }
+
+   ctx.new = pd->prev_run;
+   ctx.consumed_space = pd->prev_consumed_space;
+   ctx.relevant_space_size = relevant_space_size;
+   ctx.floating_group = NULL;
+   ctx.placed_item = NULL;
+
+   if (pd->dir == EFL_UI_LAYOUT_ORIENTATION_VERTICAL)
+     {
+        _position_items_vertical(obj, pd, &ctx);
+        _position_group_items(obj, pd, &ctx);
+     }
+   else
+     {
+        _position_items_horizontal(obj, pd, &ctx);
+        _position_group_items(obj, pd, &ctx);
+     }
+}
+
+
 
 #include "efl_ui_position_manager_grid.eo.c"

src/lib/elementary/efl_ui_position_manager_grid.eo

@@ -15,6 +15,7 @@ class @beta Efl.Ui.Position_Manager.Grid extends Efl.Object
       Efl.Ui.Position_Manager.Entity.position_single_item;
       Efl.Ui.Position_Manager.Entity.item_size_changed;
       Efl.Ui.Position_Manager.Entity.relative_item;
+      Efl.Ui.Position_Manager.Entity.entities_ready;
       Efl.Ui.Layout_Orientable.orientation {set; get;}
       Efl.Ui.Position_Manager.Data_Access_V1.data_access {set;}
       Efl.Object.finalize;

src/lib/elementary/efl_ui_position_manager_list.c

@@ -546,4 +546,34 @@ _efl_ui_position_manager_list_efl_ui_position_manager_data_access_v1_data_access
 }
 
 
+EOLIAN static void
+_efl_ui_position_manager_list_efl_ui_position_manager_entity_entities_ready(Eo *obj, Efl_Ui_Position_Manager_List_Data *pd, unsigned int start_id, unsigned int end_id)
+{
+   Eina_Size2D space_size;
+   int relevant_space_size;
+
+   if (end_id < pd->prev_run.start_id || start_id > pd->prev_run.end_id)
+     return;
+
+   if (!pd->size) return;
+   if (pd->average_item_size <= 0) return;
+
+   cache_require(obj, pd);
+
+   //space size contains the amount of space that is outside the viewport (either to the top or to the left)
+   space_size.w = (MAX(pd->abs_size.w - pd->viewport.w, 0))*pd->scroll_position.x;
+   space_size.h = (MAX(pd->abs_size.h - pd->viewport.h, 0))*pd->scroll_position.y;
+
+   if (pd->dir == EFL_UI_LAYOUT_ORIENTATION_VERTICAL)
+     {
+        relevant_space_size = space_size.h;
+     }
+   else
+     {
+        relevant_space_size = space_size.w;
+     }
+   _position_items(obj, pd, pd->prev_run, relevant_space_size);
+}
+
+
 #include "efl_ui_position_manager_list.eo.c"

src/lib/elementary/efl_ui_position_manager_list.eo

@@ -17,6 +17,7 @@ class @beta Efl.Ui.Position_Manager.List extends Efl.Object
       Efl.Ui.Position_Manager.Entity.position_single_item;
       Efl.Ui.Position_Manager.Entity.item_size_changed;
       Efl.Ui.Position_Manager.Entity.relative_item;
+      Efl.Ui.Position_Manager.Entity.entities_ready;
       Efl.Ui.Layout_Orientable.orientation {set; get;}
       Efl.Ui.Position_Manager.Data_Access_V1.data_access {set;}
    }