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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>
static bool IsScreensaverRunning();
static bool IsWorkstationLocked();
void CalculateIdleState(unsigned int idle_threshold, IdleCallback notify) {
if (CheckIdleStateIsLocked()) {
notify.Run(IDLE_STATE_LOCKED);
return;
}
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;
}
if (current_idle_time >= idle_threshold)
notify.Run(IDLE_STATE_IDLE);
else
notify.Run(IDLE_STATE_ACTIVE);
}
bool IsScreensaverRunning() {
DWORD result = 0;
if (::SystemParametersInfo(SPI_GETSCREENSAVERRUNNING, 0, &result, 0))
return result != FALSE;
return false;
}
bool IsWorkstationLocked() {
bool is_locked = true;
HDESK input_desk = ::OpenInputDesktop(0, 0, GENERIC_READ);
if (input_desk) {
wchar_t name[256] = {0};
DWORD needed = 0;
if (::GetUserObjectInformation(input_desk,
UOI_NAME,
name,
sizeof(name),
&needed)) {
is_locked = lstrcmpi(name, L"default") != 0;
}
::CloseDesktop(input_desk);
}
return is_locked;
}
bool CheckIdleStateIsLocked() {
return IsWorkstationLocked() || IsScreensaverRunning();
}
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