content/browser/power_save_blocker_impl.h

   1 // Copyright (c) 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 CONTENT_BROWSER_POWER_SAVE_BLOCKER_IMPL_H_
   6 #define CONTENT_BROWSER_POWER_SAVE_BLOCKER_IMPL_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "content/public/browser/power_save_blocker.h"
  12
  13 namespace content {
  14
  15 class WebContents;
  16
  17 class PowerSaveBlockerImpl : public PowerSaveBlocker {
  18  public:
  19   PowerSaveBlockerImpl(PowerSaveBlockerType type,
  20                        Reason reason,
  21                        const std::string& description);
  22   ~PowerSaveBlockerImpl() override;
  23
  24 #if defined(OS_ANDROID)
  25   // In Android platform, the kPowerSaveBlockPreventDisplaySleep type of
  26   // PowerSaveBlocker should associated with a WebContents, so the blocker
  27   // could be removed by platform if the WebContents is hidden.
  28   void InitDisplaySleepBlocker(WebContents* web_contents);
  29 #endif
  30
  31  private:
  32   class Delegate;
  33
  34   // Implementations of this class may need a second object with different
  35   // lifetime than the RAII container, or additional storage. This member is
  36   // here for that purpose. If not used, just define the class as an empty
  37   // RefCounted (or RefCountedThreadSafe) like so to make it compile:
  38   // class PowerSaveBlocker::Delegate
  39   //     : public base::RefCounted<PowerSaveBlocker::Delegate> {
  40   //  private:
  41   //   friend class base::RefCounted<Delegate>;
  42   //   ~Delegate() {}
  43   // };
  44   scoped_refptr<Delegate> delegate_;
  45
  46   DISALLOW_COPY_AND_ASSIGN(PowerSaveBlockerImpl);
  47 };
  48
  49 }  // namespace content
  50
  51 #endif  // CONTENT_BROWSER_POWER_SAVE_BLOCKER_IMPL_H_