elementary: improve lifecycle of model object in the fileselector widget.

This is a minimal change and it would be best to refactor the code completely
using all the infrastructure we have now instead of the organically grown code,
but I am afraid of doing such a big change at this point of our release cycle.

Part of the improvement are use of efl_replace to make sure Eo object reference
are set to NULL once reference are dropped. Handling the case when a processed
child is actually pointing to an error. Also it is not supported by model to
get their parent stolen, so this has been fixed too. Finally setting the path
asynchronously was creating more trouble than needed, when it could be done in
a synchronous way.

Reviewed-by: Marcel Hollerbach <mail@marcel-hollerbach.de>
Differential Revision: https://phab.enlightenment.org/D8336

1 files changed, 24 insertions, 19 deletions

diff --git a/src/lib/elementary/elc_fileselector.c b/src/lib/elementary/elc_fileselector.c
index d0247e3d66..7be8f0dc09 100644
--- a/src/lib/elementary/elc_fileselector.c
+++ b/src/lib/elementary/elc_fileselector.c
@@ -201,8 +201,7 @@ static void
 _elm_fileselector_smart_del_do(Elm_Fileselector *fs, Elm_Fileselector_Data *sd)
 {
    _elm_fileselector_replace_model(fs, sd, NULL, NULL);
-   if (sd->prev_model)
-     efl_unref(sd->prev_model);
+   efl_replace(&sd->prev_model, NULL);
    free(ecore_idler_del(sd->populate_idler));
    ecore_idler_del(sd->path_entry_idler);
 
@@ -842,8 +841,19 @@ _process_model(Elm_Fileselector_Data *sd, Efl_Model *child)
        !_fetch_int64_value(child, "size", &size) ||
        !_fetch_bool_value(child, "is_dir", &dir))
      {
+        Eina_Value *check_error = efl_model_property_get(child, "mtime");
+        Eina_Error err = EAGAIN;
+
+        if (eina_value_type_get(check_error) == EINA_VALUE_TYPE_ERROR)
+          {
+             // If the error is different from EAGAIN, we should definitively drop this one.
+             eina_value_error_get(check_error, &err);
+          }
         // SETUP listener to retry fetching all data when ready
-        efl_event_callback_array_add(efl_ref(child), child_model_callbacks(), sd);
+        if (err == EAGAIN)
+          {
+             efl_event_callback_array_add(efl_ref(child), child_model_callbacks(), sd);
+          }
         goto cleanup;
      }
 
@@ -1134,7 +1144,6 @@ _on_item_activated(void *data, const Efl_Event *event)
 
    if (!sd->double_tap_navigation) return;
 
-   efl_parent_set(it_data->model, data);
    _schedule_populate(data, sd, it_data->model, NULL);
 }
 
@@ -1253,8 +1262,6 @@ _on_item_selected(void *data, const Efl_Event *event)
 
    if (sd->double_tap_navigation) return;
 
-   // Take ownership of the model, to keep it alive
-   efl_parent_set(it_data->model, data);
    _schedule_populate(data, sd, it_data->model, NULL);
 }
 
@@ -1380,8 +1387,8 @@ _ok(void *data, const Efl_Event *event)
           selection = eina_stringshare_printf("%s/%s", sd->path, name);
 
         selected_model = efl_add_ref(efl_class_get(sd->model), event->object,
-                                     efl_event_callback_array_add(efl_added, noref_death(), NULL));
-        _model_str_property_set(selected_model, "path", selection);
+                                     efl_event_callback_array_add(efl_added, noref_death(), NULL),
+                                     efl_io_model_path_set(efl_added, selection));
 
         _model_event_call(fs, ELM_FILESELECTOR_EVENT_DONE, ELM_FILESELECTOR_EVENT_DONE->name, selected_model, selection);
 
@@ -1535,14 +1542,12 @@ _anchor_clicked(void *data, const Efl_Event *event)
 
    ELM_FILESELECTOR_DATA_GET(fs, sd);
 
-   if (!sd->model)
-     return;
+   if (!sd->model) return;
 
    model = efl_add_ref(efl_class_get(sd->model), event->object,
-                       efl_event_callback_array_add(efl_added, noref_death(), NULL));
-   if (!model)
-     return;
-   _model_str_property_set(model, "path", info->name);
+                       efl_event_callback_array_add(efl_added, noref_death(), NULL),
+                       efl_io_model_path_set(efl_added, info->name));
+   if (!model) return;
 
    _populate(fs, model, NULL, NULL);
    efl_unref(model);
@@ -1971,8 +1976,8 @@ _from_legacy_event_call(Elm_Fileselector *fs, Elm_Fileselector_Data *sd, const E
      model_cls = efl_class_get(sd->model);
 
    Efl_Model *model = efl_add_ref(model_cls, fs,
-                                  efl_event_callback_array_add(efl_added, noref_death(), NULL));
-   _model_str_property_set(model, "path", path);
+                                  efl_event_callback_array_add(efl_added, noref_death(), NULL),
+                                  efl_io_model_path_set(efl_added, path));
 
    // Call Eo event with model
    efl_event_callback_call(fs, evt_desc, model);
@@ -2180,15 +2185,15 @@ elm_fileselector_path_set(Evas_Object *obj,
 void
 _elm_fileselector_path_set_internal(Evas_Object *obj, const char *_path)
 {
-   Efl_Io_Model *model = efl_add_ref(EFL_IO_MODEL_CLASS, obj, efl_io_model_path_set(efl_added, _path),
-                                     efl_event_callback_array_add(efl_added, noref_death(), NULL));
+   Efl_Io_Model *model = efl_add_ref(EFL_IO_MODEL_CLASS, obj,
+                                     efl_io_model_path_set(efl_added, _path),
+                                     efl_loop_model_volatile_make(efl_added));
    if (!model)
      {
         ERR("Efl.Model allocation error");
         return;
      }
    efl_ui_view_model_set(obj, model);
-   efl_unref(model);
 }
 
 EOLIAN static void