Delay wallpaper load by 2 * average wallpaper load time.

chrome/browser/chromeos/login/wallpaper_manager.h

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_
 
 #include <string>
 
 #include "ash/desktop_background/desktop_background_controller.h"
@@ skipping 46 matching lines @@
 extern const char kLargeWallpaperSuffix[];
 
 // Directory names of custom wallpapers.
 extern const char kSmallWallpaperSubDir[];
 extern const char kLargeWallpaperSubDir[];
 extern const char kOriginalWallpaperSubDir[];
 extern const char kThumbnailWallpaperSubDir[];
 
 // This class maintains wallpapers for users who have logged into this Chrome
 // OS device.
-class WallpaperManager: public content::NotificationObserver {
+class WallpaperManager : public content::NotificationObserver {
  public:
   // For testing.
   class TestApi {
    public:
     explicit TestApi(WallpaperManager* wallpaper_manager);
     virtual ~TestApi();
 
     base::FilePath current_wallpaper_path();
 
    private:
     WallpaperManager* wallpaper_manager_;  // not owned
 
     DISALLOW_COPY_AND_ASSIGN(TestApi);
   };
 
+  class Observer : public base::RefCounted<Observer> {
+   public:
+    virtual ~Observer() {};
+    virtual void OnWallpaperAnimationFinished(const std::string& email) = 0;
+  };
+
+  typedef std::list<base::WeakPtr<Observer> > ObserverList;

[dzhioev (left Google), 2013/10/17 12:47:49]

Use ObserverList from base/observer_list.h

+
   static WallpaperManager* Get();
 
   WallpaperManager();
   virtual ~WallpaperManager();
 
   void set_command_line_for_testing(CommandLine* command_line) {
     command_line_for_testing_ = command_line;
   }
 
   // Indicates imminent shutdown, allowing the WallpaperManager to remove any
@@ skipping 87 matching lines @@
   void SetUserWallpaper(const std::string& email);
 
   // Sets wallpaper to |wallpaper|.
   void SetWallpaperFromImageSkia(const gfx::ImageSkia& wallpaper,
                                  ash::WallpaperLayout layout);
 
   // Updates current wallpaper. It may switch the size of wallpaper based on the
   // current display's resolution.
   void UpdateWallpaper();
 
+  // Adds given observer to the list.
+  void AddObserver(base::WeakPtr<Observer> observer);
+
  private:
   friend class TestApi;
   friend class WallpaperManagerBrowserTest;
   typedef std::map<std::string, gfx::ImageSkia> CustomWallpaperMap;
 
   // The number of wallpapers have loaded. For test only.
   int loaded_wallpapers() const { return loaded_wallpapers_; }
 
   // Cache some (or all) logged in users' wallpapers to memory at login
   // screen. It should not compete with first wallpaper loading when boot
@@ skipping 80 matching lines @@
   void SaveWallpaperInternal(const base::FilePath& path, const char* data,
                              int size);
 
   // Starts to load wallpaper at |wallpaper_path|. If |wallpaper_path| is the
   // same as |current_wallpaper_path_|, do nothing. Must be called on UI thread.
   void StartLoad(const std::string& email,
                  const WallpaperInfo& info,
                  bool update_wallpaper,
                  const base::FilePath& wallpaper_path);
 
+  // Notify all registed observers.
+  void NotifyAnimationFinished();
+
   // The number of loaded wallpapers.
   int loaded_wallpapers_;
 
   // Sequence token associated with wallpaper operations.
   base::SequencedWorkerPool::SequenceToken sequence_token_;
 
   // Wallpaper sequenced task runner.
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
 
   // The file path of current loaded/loading custom/online wallpaper.
@@ skipping 16 matching lines @@
 
   bool should_cache_wallpaper_;
 
   scoped_ptr<CrosSettings::ObserverSubscription>
       show_user_name_on_signin_subscription_;
 
   base::WeakPtrFactory<WallpaperManager> weak_factory_;
 
   content::NotificationRegistrar registrar_;
 
+  ObserverList observers_;
+
   DISALLOW_COPY_AND_ASSIGN(WallpaperManager);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_WALLPAPER_MANAGER_H_