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// Copyright (C) 2018 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 QTESTSUPPORT_CORE_H
#define QTESTSUPPORT_CORE_H
#include <QtCore/qcoreapplication.h>
#include <QtCore/qdeadlinetimer.h>
#include <QtCore/qthread.h>
QT_BEGIN_NAMESPACE
namespace QTest {
Q_CORE_EXPORT void qSleep(int ms);
template <typename Functor>
[[nodiscard]] static bool qWaitFor(Functor predicate, int timeout = 5000)
{
// We should not spin the event loop in case the predicate is already true,
// otherwise we might send new events that invalidate the predicate.
if (predicate())
return true;
// qWait() is expected to spin the event loop, even when called with a small
// timeout like 1ms, so we we can't use a simple while-loop here based on
// the deadline timer not having timed out. Use do-while instead.
int remaining = timeout;
QDeadlineTimer deadline(remaining, Qt::PreciseTimer);
do {
// We explicitly do not pass the remaining time to processEvents, as
// that would keep spinning processEvents for the whole duration if
// new events were posted as part of processing events, and we need
// to return back to this function to check the predicate between
// each pass of processEvents. Our own timer will take care of the
// timeout.
QCoreApplication::processEvents(QEventLoop::AllEvents);
QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete);
if (predicate())
return true;
remaining = int(deadline.remainingTime());
if (remaining > 0)
qSleep(qMin(10, remaining));
remaining = int(deadline.remainingTime());
} while (remaining > 0);
return predicate(); // Last chance
}
Q_CORE_EXPORT void qWait(int ms);
} // namespace QTest
QT_END_NAMESPACE
#endif
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