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Diffstat (limited to 'src/corelib/kernel/qtestsupport_core.h')
-rw-r--r-- | src/corelib/kernel/qtestsupport_core.h | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/src/corelib/kernel/qtestsupport_core.h b/src/corelib/kernel/qtestsupport_core.h new file mode 100644 index 0000000000..7fc0054580 --- /dev/null +++ b/src/corelib/kernel/qtestsupport_core.h @@ -0,0 +1,92 @@ +/**************************************************************************** +** +** Copyright (C) 2018 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtTest module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QTESTSUPPORT_CORE_H +#define QTESTSUPPORT_CORE_H + +#include <QtCore/qcoreapplication.h> +#include <QtCore/qdeadlinetimer.h> + +QT_BEGIN_NAMESPACE + +namespace QTestPrivate { +Q_CORE_EXPORT void qSleep(int ms); +} + +namespace QTest { + +template <typename Functor> +Q_REQUIRED_RESULT 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 { + QCoreApplication::processEvents(QEventLoop::AllEvents, remaining); + QCoreApplication::sendPostedEvents(nullptr, QEvent::DeferredDelete); + + remaining = deadline.remainingTime(); + if (remaining > 0) + QTestPrivate::qSleep(qMin(10, remaining)); + + if (predicate()) + return true; + + remaining = deadline.remainingTime(); + } while (remaining > 0); + + return predicate(); // Last chance +} + +Q_CORE_EXPORT void qWait(int ms); + +} // namespace QTest + +QT_END_NAMESPACE + +#endif |