components/drive/change_list_loader_observer.h

   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 COMPONENTS_DRIVE_CHANGE_LIST_LOADER_OBSERVER_H_
   6 #define COMPONENTS_DRIVE_CHANGE_LIST_LOADER_OBSERVER_H_
   7
   8 namespace base {
   9 class FilePath;
  10 }  // namespace base
  11
  12 namespace drive {
  13 class FileChange;
  14 namespace internal {
  15
  16 // Interface for classes that need to observe events from ChangeListLoader.
  17 // All events are notified on UI thread.
  18 class ChangeListLoaderObserver {
  19  public:
  20   // Triggered when the content of a directory is reloaded. The content may
  21   // changed.  |directory_path| is a virtual directory path representing the
  22   // reloaded directory.
  23   virtual void OnDirectoryReloaded(const base::FilePath& directory_path) {}
  24
  25   // Triggered when content(s) in drive has been changed.
  26   virtual void OnFileChanged(const FileChange& changed_files) {}
  27
  28   // Triggered when loading from the server is complete.
  29   virtual void OnLoadFromServerComplete() {}
  30
  31   // Triggered when loading is complete for the first time, either from the
  32   // the server or the cache. To be precise, for the latter case, we do not
  33   // load anything from the cache. We just check that the resource metadata
  34   // is stored locally thus can be used.
  35   virtual void OnInitialLoadComplete() {}
  36
  37  protected:
  38   virtual ~ChangeListLoaderObserver() {}
  39 };
  40
  41 }  // namespace internal
  42 }  // namespace drive
  43
  44 #endif  // COMPONENTS_DRIVE_CHANGE_LIST_LOADER_OBSERVER_H_