chrome/browser/ui/app_list/fast_show_pickler.h

   1 // Copyright 2013 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 CHROME_BROWSER_UI_APP_LIST_FAST_SHOW_PICKLER_H_
   6 #define CHROME_BROWSER_UI_APP_LIST_FAST_SHOW_PICKLER_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/pickle.h"
  12 #include "ui/app_list/app_list_model.h"
  13
  14 // Functions for pickling/unpickling AppListModel for fast show. Fast show is
  15 // where the app list is put on the screen using data retrieved from a cache
  16 // before the extension system has loaded.
  17 class FastShowPickler {
  18  public:
  19   // The version that this pickler understands.
  20   static const int kVersion;
  21
  22   // Pickles a subset of the data in |model| that is useful for doing a fast
  23   // show of the app list.
  24   static scoped_ptr<base::Pickle> PickleAppListModelForFastShow(
  25       app_list::AppListModel* model);
  26
  27   // Given a Pickle created by PickleAppListModelForFastShow(), this creates an
  28   // AppListModel that represents it.
  29   static scoped_ptr<app_list::AppListModel> UnpickleAppListModelForFastShow(
  30       base::Pickle* pickle);
  31
  32   // Copies parts that are needed to show the app list quickly on startup from
  33   // |src| to |dest|.
  34   static void CopyOver(
  35       app_list::AppListModel* src, app_list::AppListModel* dest);
  36
  37  private:
  38   // Private static methods allow friend access to AppListItem methods.
  39   static scoped_ptr<app_list::AppListItem> UnpickleAppListItem(
  40       base::PickleIterator* it);
  41   static bool PickleAppListItem(base::Pickle* pickle,
  42                                 app_list::AppListItem* item);
  43   static void CopyOverItem(app_list::AppListItem* src_item,
  44                            app_list::AppListItem* dest_item);
  45 };
  46
  47 #endif  // CHROME_BROWSER_UI_APP_LIST_FAST_SHOW_PICKLER_H_