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// 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.
#include "base/idle_timer.h"
#include "base/message_loop.h"
#include "base/time.h"
namespace base {
IdleTimer::IdleTimer(TimeDelta idle_time, bool repeat)
: idle_interval_(idle_time),
repeat_(repeat),
get_last_input_info_fn_(GetLastInputInfo) {
DCHECK_EQ(MessageLoop::TYPE_UI, MessageLoop::current()->type()) <<
"Requires a thread that processes Windows UI events";
}
IdleTimer::~IdleTimer() {
Stop();
}
void IdleTimer::Start() {
StartTimer();
}
void IdleTimer::Stop() {
timer_.Stop();
}
void IdleTimer::Run() {
// Verify we can fire the idle timer.
if (TimeUntilIdle().InMilliseconds() <= 0) {
OnIdle();
last_time_fired_ = Time::Now();
}
Stop();
StartTimer(); // Restart the timer for next run.
}
void IdleTimer::StartTimer() {
DCHECK(!timer_.IsRunning());
TimeDelta delay = TimeUntilIdle();
if (delay.InMilliseconds() < 0)
delay = TimeDelta();
timer_.Start(delay, this, &IdleTimer::Run);
}
TimeDelta IdleTimer::CurrentIdleTime() {
// TODO(mbelshe): This is windows-specific code.
LASTINPUTINFO info;
info.cbSize = sizeof(info);
if (get_last_input_info_fn_(&info)) {
// Note: GetLastInputInfo returns a 32bit value which rolls over ~49days.
int32 last_input_time = info.dwTime;
int32 current_time = GetTickCount();
int32 interval = current_time - last_input_time;
// Interval will go negative if we've been idle for 2GB of ticks.
if (interval < 0)
interval = -interval;
return TimeDelta::FromMilliseconds(interval);
}
NOTREACHED();
return TimeDelta::FromMilliseconds(0);
}
TimeDelta IdleTimer::TimeUntilIdle() {
TimeDelta time_since_last_fire = Time::Now() - last_time_fired_;
TimeDelta current_idle_time = CurrentIdleTime();
if (current_idle_time > time_since_last_fire) {
if (repeat_)
return idle_interval_ - time_since_last_fire;
return idle_interval_;
}
return idle_interval_ - current_idle_time;
}
} // namespace base
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