| // Copyright (c) 2006-2008 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 BASE_IDLE_TIMER_H__ |
| #define BASE_IDLE_TIMER_H__ |
| |
| #include <windows.h> |
| |
| #include "base/basictypes.h" |
| #include "base/task.h" |
| #include "base/timer.h" |
| |
| // IdleTimer is a recurring Timer task which runs only when the system is idle. |
| // System Idle time is defined as not having any user keyboard or mouse |
| // activity for some period of time. Because the timer is user dependant, it |
| // is possible for the timer to never fire. |
| |
| // |
| // Usage should be for low-priority tasks, and may look like this: |
| // |
| // class MyIdleTimerTask : public IdleTimerTask { |
| // public: |
| // // This task will run after 5 seconds of idle time |
| // // and not more often than once per minute. |
| // MyIdleTimerTask() : IdleTimerTask(5, 60) {}; |
| // virtual void OnIdle() { do something }; |
| // } |
| // |
| // MyIdleTimerTask *task = new MyIdleTimerTask(); |
| // task->Start(); |
| // |
| // // As with all TimerTasks, the caller must dispose the object. |
| // delete task; // Will Stop the timer and cleanup the task. |
| |
| class TimerManager; |
| |
| // Function prototype for GetLastInputInfo. |
| typedef BOOL (__stdcall *GetLastInputInfoFunction)(PLASTINPUTINFO plii); |
| |
| class IdleTimerTask : public Task { |
| public: |
| // Create an IdleTimerTask. |
| // idle_time: idle time required before this task can run. |
| // repeat: true if the timer should fire multiple times per idle, |
| // false to fire once per idle. |
| IdleTimerTask(TimeDelta idle_time, bool repeat); |
| |
| // On destruction, the IdleTimerTask will Stop itself and delete the Task. |
| virtual ~IdleTimerTask(); |
| |
| // Start the IdleTimerTask. |
| void Start(); |
| |
| // Stop the IdleTimertask. |
| void Stop(); |
| |
| // The method to run when the timer elapses. |
| virtual void OnIdle() = 0; |
| |
| protected: |
| // Override the GetLastInputInfo function. |
| void set_last_input_info_fn(GetLastInputInfoFunction function) { |
| get_last_input_info_fn_ = function; |
| } |
| |
| private: |
| // This task's run method. |
| virtual void Run(); |
| |
| // Start the timer. |
| void StartTimer(); |
| |
| // Gets the number of milliseconds since the last input event. |
| TimeDelta CurrentIdleTime(); |
| |
| // Compute time until idle. Returns 0 if we are now idle. |
| TimeDelta TimeUntilIdle(); |
| |
| TimeDelta idle_interval_; |
| bool repeat_; |
| Time last_time_fired_; // The last time the idle timer fired. |
| // will be 0 until the timer fires the first time. |
| scoped_ptr<OneShotTimer> timer_; |
| |
| GetLastInputInfoFunction get_last_input_info_fn_; |
| }; |
| |
| #endif // BASE_IDLE_TIMER_H__ |
| |