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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_APP_LIST_APP_LIST_MODEL_OBSERVER_H_
      6 #define UI_APP_LIST_APP_LIST_MODEL_OBSERVER_H_
      7 
      8 #include "ui/app_list/app_list_export.h"
      9 
     10 namespace app_list {
     11 
     12 class AppListItem;
     13 
     14 class APP_LIST_EXPORT AppListModelObserver {
     15  public:
     16   // Invoked when AppListModel's status has changed.
     17   virtual void OnAppListModelStatusChanged() {}
     18 
     19   // Triggered after |item| has been added to the model.
     20   virtual void OnAppListItemAdded(AppListItem* item) {}
     21 
     22   // Triggered just before an item is deleted from the model.
     23   virtual void OnAppListItemWillBeDeleted(AppListItem* item) {}
     24 
     25   // Triggered just after an item is deleted from the model.
     26   virtual void OnAppListItemDeleted() {}
     27 
     28   // Triggered after |item| has moved, changed folders, or changed properties.
     29   virtual void OnAppListItemUpdated(AppListItem* item) {}
     30 
     31  protected:
     32   virtual ~AppListModelObserver() {}
     33 };
     34 
     35 }  // namespace app_list
     36 
     37 #endif  // UI_APP_LIST_APP_LIST_MODEL_OBSERVER_H_
     38