qabstracteventdispatcher.h

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// Copyright (C) 2020 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 QABSTRACTEVENTDISPATCHER_H
#define QABSTRACTEVENTDISPATCHER_H
 
#include <QtCore/qobject.h>
#include <QtCore/qeventloop.h>
 
QT_BEGIN_NAMESPACE
 
class QAbstractNativeEventFilter;
class QAbstractEventDispatcherPrivate;
class QSocketNotifier;
 
class Q_CORE_EXPORT QAbstractEventDispatcher : public QObject
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QAbstractEventDispatcher)
 
public:
    using Duration = std::chrono::nanoseconds;
    struct TimerInfo
    {
        int timerId;
        int interval;
        Qt::TimerType timerType;
 
        inline TimerInfo(int id, int i, Qt::TimerType t)
            : timerId(id), interval(i), timerType(t) { }
    };
    struct TimerInfoV2
    {
        Duration interval;
        Qt::TimerId timerId;
        Qt::TimerType timerType;
    };
 
    explicit QAbstractEventDispatcher(QObject *parent = nullptr);
    ~QAbstractEventDispatcher();
 
    static QAbstractEventDispatcher *instance(QThread *thread = nullptr);
 
    virtual bool processEvents(QEventLoop::ProcessEventsFlags flags) = 0;
 
    virtual void registerSocketNotifier(QSocketNotifier *notifier) = 0;
    virtual void unregisterSocketNotifier(QSocketNotifier *notifier) = 0;
 
    Qt::TimerId registerTimer(Duration interval, Qt::TimerType timerType, QObject *object);
 
#if QT_VERSION < QT_VERSION_CHECK(7, 0, 0)
    int registerTimer(qint64 interval, Qt::TimerType timerType, QObject *object);
 
    // old, integer-based API
    virtual void registerTimer(int timerId, qint64 interval, Qt::TimerType timerType, QObject *object) = 0;
    virtual bool unregisterTimer(int timerId) = 0;
    virtual QList<TimerInfo> registeredTimers(QObject *object) const = 0;
    virtual int remainingTime(int timerId) = 0;
 
    void registerTimer(Qt::TimerId timerId, Duration interval, Qt::TimerType timerType, QObject *object);
    bool unregisterTimer(Qt::TimerId timerId);
    QList<TimerInfoV2> timersForObject(QObject *object) const;
    Duration remainingTime(Qt::TimerId timerId) const;
#else
    virtual void registerTimer(Qt::TimerId timerId, Duration interval, Qt::TimerType timerType, QObject *object) = 0;
    virtual bool unregisterTimer(Qt::TimerId timerId) = 0;
    virtual QList<TimerInfoV2> timersForObject(QObject *object) const = 0;
    virtual Duration remainingTime(Qt::TimerId timerId) const = 0;
#endif
    virtual bool unregisterTimers(QObject *object) = 0;
 
    virtual void wakeUp() = 0;
    virtual void interrupt() = 0;
 
    virtual void startingUp();
    virtual void closingDown();
 
    void installNativeEventFilter(QAbstractNativeEventFilter *filterObj);
    void removeNativeEventFilter(QAbstractNativeEventFilter *filterObj);
    bool filterNativeEvent(const QByteArray &eventType, void *message, qintptr *result);
 
Q_SIGNALS:
    void aboutToBlock();
    void awake();
 
protected:
    QAbstractEventDispatcher(QAbstractEventDispatcherPrivate &,
                             QObject *parent);
};
 
Q_DECLARE_TYPEINFO(QAbstractEventDispatcher::TimerInfo, Q_PRIMITIVE_TYPE);
Q_DECLARE_TYPEINFO(QAbstractEventDispatcher::TimerInfoV2, Q_PRIMITIVE_TYPE);
 
#if QT_VERSION < QT_VERSION_CHECK(7, 0, 0)
class Q_CORE_EXPORT QAbstractEventDispatcherV2 : public QAbstractEventDispatcher
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(QAbstractEventDispatcher) // not V2
 
public:
    explicit QAbstractEventDispatcherV2(QObject *parent = nullptr);
    ~QAbstractEventDispatcherV2();
 
    // new virtuals
    virtual void registerTimer(Qt::TimerId timerId, Duration interval, Qt::TimerType timerType,
                               QObject *object) = 0;
    virtual bool unregisterTimer(Qt::TimerId timerId) = 0;
    virtual QList<TimerInfoV2> timersForObject(QObject *object) const = 0;
    virtual Duration remainingTime(Qt::TimerId timerId) const = 0;
 
protected:
    QAbstractEventDispatcherV2(QAbstractEventDispatcherPrivate &, QObject *parent);
 
private:
    // final overrides from V1
    virtual void registerTimer(int timerId, qint64 interval, Qt::TimerType timerType,
                               QObject *object) override final;
    virtual bool unregisterTimer(int timerId) override final;
    virtual QList<TimerInfo> registeredTimers(QObject *object) const override final;
 
    virtual int remainingTime(int timerId) override final;
};
#else
using QAbstractEventDispatcherV2 = QAbstractEventDispatcher;
#endif // Qt 7
 
QT_END_NAMESPACE
 
#endif // QABSTRACTEVENTDISPATCHER_H