Asynchronously load wallpapers when user pod is selected.

chrome/browser/chromeos/background/desktop_background_observer.cc

-// Copyright (c) 2012 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.
-
-#include "chrome/browser/chromeos/background/desktop_background_observer.h"
-
-#include "ash/shell.h"
-#include "ash/desktop_background/desktop_background_controller.h"
-#include "ash/desktop_background/desktop_background_resources.h"
-#include "base/logging.h"
-#include "chrome/browser/chromeos/login/user_manager.h"
-#include "chrome/browser/profiles/profile_manager.h"
-#include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/browser_list.h"
-#include "chrome/common/chrome_notification_types.h"
-#include "content/public/browser/notification_service.h"
-
-namespace chromeos {
-
-namespace {
-
-class UserWallpaperDelegate: public ash::UserWallpaperDelegate {
- public:
-  UserWallpaperDelegate() {
-  }
-
-  virtual ~UserWallpaperDelegate() {
-  }
-
-  virtual const int GetUserWallpaperIndex() OVERRIDE {
-    return chromeos::UserManager::Get()->GetUserWallpaperIndex();
-  }
-
-  virtual void OpenSetWallpaperPage() OVERRIDE {
-    Browser* browser = Browser::GetOrCreateTabbedBrowser(
-        ProfileManager::GetDefaultProfileOrOffTheRecord());
-    browser->ShowOptionsTab("setWallpaper");
-  }
-
-  virtual bool CanOpenSetWallpaperPage() OVERRIDE {
-    return !chromeos::UserManager::Get()->IsLoggedInAsGuest();
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(UserWallpaperDelegate);
-};
-
-}  // namespace
-
-ash::UserWallpaperDelegate* CreateUserWallpaperDelegate() {
-  return new chromeos::UserWallpaperDelegate();
-}
-
-DesktopBackgroundObserver::DesktopBackgroundObserver() {
-  registrar_.Add(
-      this,
-      chrome::NOTIFICATION_LOGIN_USER_CHANGED,
-      content::NotificationService::AllSources());
-}
-
-DesktopBackgroundObserver::~DesktopBackgroundObserver() {
-}
-
-void DesktopBackgroundObserver::Observe(int type,
-    const content::NotificationSource& source,
-    const content::NotificationDetails& details) {
-  switch (type) {
-    case chrome::NOTIFICATION_LOGIN_USER_CHANGED: {
-      ash::Shell::GetInstance()->desktop_background_controller()->
-          SetDesktopBackgroundImageMode();
-      break;
-    }
-    default:
-      NOTREACHED();
-  }
-}
-
-}  // namespace chromeos