tdesktop/Telegram/SourceFiles/base/timer.h

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/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once
#include "base/lambda.h"
#include "base/observer.h"
namespace base {
class Timer final : private QObject {
public:
Timer(base::lambda<void()> callback = base::lambda<void()>());
static Qt::TimerType DefaultType(TimeMs timeout) {
constexpr auto kThreshold = TimeMs(1000);
return (timeout > kThreshold) ? Qt::CoarseTimer : Qt::PreciseTimer;
}
void setCallback(base::lambda<void()> callback) {
_callback = std::move(callback);
}
void callOnce(TimeMs timeout) {
callOnce(timeout, DefaultType(timeout));
}
void callEach(TimeMs timeout) {
callEach(timeout, DefaultType(timeout));
}
void callOnce(TimeMs timeout, Qt::TimerType type) {
start(timeout, type, Repeat::SingleShot);
}
void callEach(TimeMs timeout, Qt::TimerType type) {
start(timeout, type, Repeat::Interval);
}
bool isActive() const {
return (_timerId != 0);
}
void cancel();
TimeMs remainingTime() const;
static void Adjust();
protected:
void timerEvent(QTimerEvent *e) override;
private:
enum class Repeat : unsigned {
Interval = 0,
SingleShot = 1,
};
void start(TimeMs timeout, Qt::TimerType type, Repeat repeat);
void adjust();
void setTimeout(TimeMs timeout);
int timeout() const;
void setRepeat(Repeat repeat) {
_repeat = static_cast<unsigned>(repeat);
}
Repeat repeat() const {
return static_cast<Repeat>(_repeat);
}
base::lambda<void()> _callback;
TimeMs _next = 0;
int _timeout = 0;
int _timerId = 0;
Qt::TimerType _type : 2;
bool _adjusted : 1;
unsigned _repeat : 1;
};
class DelayedCallTimer final : private QObject {
public:
int call(TimeMs timeout, lambda_once<void()> callback) {
return call(timeout, std::move(callback), Timer::DefaultType(timeout));
}
int call(TimeMs timeout, lambda_once<void()> callback, Qt::TimerType type);
void cancel(int callId);
protected:
void timerEvent(QTimerEvent *e) override;
private:
std::map<int, lambda_once<void()>> _callbacks; // Better to use flatmap.
};
} // namespace base