qbasictimer.cpp

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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
 
#include "qbasictimer.h"
#include "qabstracteventdispatcher.h"
#include "qabstracteventdispatcher_p.h"
 
QT_BEGIN_NAMESPACE
 
void QBasicTimer::start(std::chrono::milliseconds duration, QObject *object)
{
    start(duration, Qt::CoarseTimer, object);
}
 
void QBasicTimer::start(std::chrono::milliseconds duration, Qt::TimerType timerType, QObject *obj)
{
    QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
    if (Q_UNLIKELY(duration.count() < 0)) {
        qWarning("QBasicTimer::start: Timers cannot have negative timeouts");
        return;
    }
    if (Q_UNLIKELY(!eventDispatcher)) {
        qWarning("QBasicTimer::start: QBasicTimer can only be used with threads started with QThread");
        return;
    }
    if (Q_UNLIKELY(obj && obj->thread() != eventDispatcher->thread())) {
        qWarning("QBasicTimer::start: Timers cannot be started from another thread");
        return;
    }
    stop();
    if (obj)
        id = int(eventDispatcher->registerTimer(duration, timerType, obj));
}
 
void QBasicTimer::stop()
{
    if (id) {
        QAbstractEventDispatcher *eventDispatcher = QAbstractEventDispatcher::instance();
        if (eventDispatcher && !eventDispatcher->unregisterTimer(Qt::TimerId(id))) {
            qWarning("QBasicTimer::stop: Failed. Possibly trying to stop from a different thread");
            return;
        }
        QAbstractEventDispatcherPrivate::releaseTimerId(id);
    }
    id = 0;
}
 
QT_END_NAMESPACE