15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 52a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifndef CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_ 62a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <string> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 112a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "base/memory/scoped_ptr.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "content/common/content_export.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace content { 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// A RAII-style class to block the system from entering low-power (sleep) mode. 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// This class is thread-safe; it may be constructed and deleted on any thread. 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class CONTENT_EXPORT PowerSaveBlocker { 195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) enum PowerSaveBlockerType { 215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Prevent the application from being suspended. On some platforms, apps may 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // be suspended when they are not visible to the user. This type of block 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // requests that the app continue to run in that case, and on all platforms 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // prevents the system from sleeping. 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Example use cases: downloading a file, playing audio. 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kPowerSaveBlockPreventAppSuspension, 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Prevent the display from going to sleep. This also has the side effect of 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // preventing the system from sleeping, but does not necessarily prevent the 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // app from being suspended on some platforms if the user hides it. 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Example use case: playing video. 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) kPowerSaveBlockPreventDisplaySleep, 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }; 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 352a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual ~PowerSaveBlocker() = 0; 362a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Pass in the type of power save blocking desired. If multiple types of 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // blocking are desired, instantiate one PowerSaveBlocker for each type. 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |reason| may be provided to the underlying system APIs on some platforms. 402a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) static scoped_ptr<PowerSaveBlocker> Create(PowerSaveBlockerType type, 412a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) const std::string& reason); 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace content 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 462a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif // CONTENT_PUBLIC_BROWSER_POWER_SAVE_BLOCKER_H_ 47