qtimerinfo_unix_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QTIMERINFO_UNIX_P_H
#define QTIMERINFO_UNIX_P_H
 
//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
 
#include <QtCore/private/qglobal_p.h>
 
#include "qabstracteventdispatcher.h"
 
#include <sys/time.h> // struct timespec
#include <chrono>
 
QT_BEGIN_NAMESPACE
 
// internal timer info
struct QTimerInfo {
    int id;           // - timer identifier
    Qt::TimerType timerType; // - timer type
    std::chrono::milliseconds interval; // - timer interval
    std::chrono::steady_clock::time_point timeout; // - when to actually fire
    QObject *obj;     // - object to receive event
    QTimerInfo **activateRef; // - ref from activateTimers
};
 
class Q_CORE_EXPORT QTimerInfoList : public QList<QTimerInfo*>
{
    // state variables used by activateTimers()
    QTimerInfo *firstTimerInfo = nullptr;
 
public:
    QTimerInfoList();
 
    std::chrono::steady_clock::time_point currentTime;
 
    bool timerWait(timespec &);
    void timerInsert(QTimerInfo *);
 
    qint64 timerRemainingTime(int timerId);
    std::chrono::milliseconds remainingDuration(int timerId);
 
    void registerTimer(int timerId, qint64 interval, Qt::TimerType timerType, QObject *object);
    void registerTimer(int timerId, std::chrono::milliseconds interval, Qt::TimerType timerType,
                       QObject *object);
    bool unregisterTimer(int timerId);
    bool unregisterTimers(QObject *object);
    QList<QAbstractEventDispatcher::TimerInfo> registeredTimers(QObject *object) const;
 
    int activateTimers();
    bool hasPendingTimers();
 
    QList::const_iterator findTimerById(int timerId) const
    {
        auto matchesId = [timerId](const QTimerInfo *t) { return t->id == timerId; };
        return std::find_if(cbegin(), cend(), matchesId);
    }
 
private:
    std::chrono::steady_clock::time_point updateCurrentTime();
};
 
QT_END_NAMESPACE
 
#endif // QTIMERINFO_UNIX_P_H