1 // Copyright (c) 2011 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 #include "chrome/browser/idle.h" 6 7 #include <limits.h> 8 #include <windows.h> 9 10 #include "ui/base/win/lock_state.h" 11 12 namespace { 13 14 DWORD CalculateIdleTimeInternal() { 15 LASTINPUTINFO last_input_info = {0}; 16 last_input_info.cbSize = sizeof(LASTINPUTINFO); 17 DWORD current_idle_time = 0; 18 if (::GetLastInputInfo(&last_input_info)) { 19 DWORD now = ::GetTickCount(); 20 if (now < last_input_info.dwTime) { 21 // GetTickCount() wraps around every 49.7 days -- assume it wrapped just 22 // once. 23 const DWORD kMaxDWORD = static_cast<DWORD>(-1); 24 DWORD time_before_wrap = kMaxDWORD - last_input_info.dwTime; 25 DWORD time_after_wrap = now; 26 // The sum is always smaller than kMaxDWORD. 27 current_idle_time = time_before_wrap + time_after_wrap; 28 } else { 29 current_idle_time = now - last_input_info.dwTime; 30 } 31 32 // Convert from ms to seconds. 33 current_idle_time /= 1000; 34 } 35 36 return current_idle_time; 37 } 38 39 bool IsScreensaverRunning() { 40 DWORD result = 0; 41 if (::SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, &result, 0)) 42 return result != FALSE; 43 return false; 44 } 45 46 } // namespace 47 48 void CalculateIdleTime(IdleTimeCallback notify) { 49 notify.Run(static_cast<int>(CalculateIdleTimeInternal())); 50 } 51 52 bool CheckIdleStateIsLocked() { 53 return ui::IsWorkstationLocked() || IsScreensaverRunning(); 54 } 55
