Screensaver implementation for ChromeOS.

chrome/browser/chromeos/screensaver/screensaver_controller.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_SCREENSAVER_SCREENSAVER_CONTROLLER_H_
+#define CHROME_BROWSER_CHROMEOS_SCREENSAVER_SCREENSAVER_CONTROLLER_H_
+
+#include <string>
+
+#include "ash/wm/user_activity_observer.h"
+#include "base/basictypes.h"
+#include "base/gtest_prod_util.h"
+#include "base/memory/weak_ptr.h"
+#include "base/time.h"
+#include "chromeos/dbus/power_manager_client.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+namespace extensions {
+class Extension;
+}
+
+namespace chromeos {
+
+// This class controls the management of the screensaver extension. It is
+// responsible for,

[stevenjb, 2013/01/31 23:42:18]

nit: s/,/:

[rkc, 2013/02/01 00:35:45]

Done.

+// . Enabling and disabling of the screensaver, long with ensuring that we have

[stevenjb, 2013/01/31 23:42:18]

s/long/along

[rkc, 2013/02/01 00:35:45]

Done.

+//   only one screensaver at a time.
+// . Managing the showing and hiding of the current screensaver based on user
+//   activity.
+// . Any power management that may be required while a screensaver is active.
+class ScreensaverController : public ash::UserActivityObserver,
+                              public PowerManagerClient::Observer,
+                              public content::NotificationObserver {
+ public:
+  ScreensaverController();
+  virtual ~ScreensaverController();
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(ScreensaverControllerTest, Basic);
+  FRIEND_TEST_ALL_PREFIXES(ScreensaverControllerTest, OutOfOrder);
+
+  // Overridden from content::NotificationObserver:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  // Overridden from PowerManagerClient::Observer:
+  virtual void IdleNotify(int64 threshold) OVERRIDE;
+
+  // UserActivityObserver::Observer overrides:
+  virtual void OnUserActivity() OVERRIDE;
+
+  void SetupScreensaver(const std::string& screensaver_extension_id);
+  void TeardownScreensaver();
+
+  void RequestNextIdleNotification();
+
+  std::string screensaver_extension_id_;
+
+  content::NotificationRegistrar registrar_;
+
+  base::TimeDelta threshold_;
+
+  base::WeakPtrFactory<ScreensaverController> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScreensaverController);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_SCREENSAVER_SCREENSAVER_CONTROLLER_H_