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// Copyright (c) 2011 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.
#include "chrome/browser/idle.h"
#include <limits.h>
#include <windows.h>
#include "ui/base/win/lock_state.h"
namespace {
DWORD CalculateIdleTimeInternal() {
LASTINPUTINFO last_input_info = {0};
last_input_info.cbSize = sizeof(LASTINPUTINFO);
DWORD current_idle_time = 0;
if (::GetLastInputInfo(&last_input_info)) {
DWORD now = ::GetTickCount();
if (now < last_input_info.dwTime) {
// GetTickCount() wraps around every 49.7 days -- assume it wrapped just
// once.
const DWORD kMaxDWORD = static_cast<DWORD>(-1);
DWORD time_before_wrap = kMaxDWORD - last_input_info.dwTime;
DWORD time_after_wrap = now;
// The sum is always smaller than kMaxDWORD.
current_idle_time = time_before_wrap + time_after_wrap;
} else {
current_idle_time = now - last_input_info.dwTime;
}
// Convert from ms to seconds.
current_idle_time /= 1000;
}
return current_idle_time;
}
bool IsScreensaverRunning() {
DWORD result = 0;
if (::SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, &result, 0))
return result != FALSE;
return false;
}
} // namespace
void CalculateIdleTime(IdleTimeCallback notify) {
notify.Run(static_cast<int>(CalculateIdleTimeInternal()));
}
bool CheckIdleStateIsLocked() {
return ui::IsWorkstationLocked() || IsScreensaverRunning();
}
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