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/****************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebEngine module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef WAITFORSIGNAL_H
#define WAITFORSIGNAL_H
#include <QObject>
#include <QTestEventLoop>
#include <utility>
// Implementation details of waitForSignal.
namespace {
// Wraps a functor to set a flag and exit from event loop if called.
template <class SignalHandler>
struct waitForSignal_SignalHandlerWrapper {
waitForSignal_SignalHandlerWrapper(SignalHandler &&sh)
: signalHandler(std::forward<SignalHandler>(sh)) {}
template <class... Args>
void operator()(Args && ... args) {
signalHandler(std::forward<Args>(args)...);
hasBeenCalled = true;
loop.exitLoop();
}
SignalHandler &&signalHandler;
QTestEventLoop loop;
bool hasBeenCalled = false;
};
// No-op functor.
struct waitForSignal_DefaultSignalHandler {
template <class... Args>
void operator()(Args && ...) {}
};
} // namespace
// Wait for a signal to be emitted.
//
// The given functor is called with the signal arguments allowing the arguments
// to be modified before returning from the signal handler (unlike QSignalSpy).
template <class Sender, class Signal, class SignalHandler>
bool waitForSignal(Sender &&sender, Signal &&signal, SignalHandler &&signalHandler, int timeout = 15000)
{
waitForSignal_SignalHandlerWrapper<SignalHandler> signalHandlerWrapper(
std::forward<SignalHandler>(signalHandler));
auto connection = QObject::connect(
std::forward<Sender>(sender),
std::forward<Signal>(signal),
std::ref(signalHandlerWrapper));
signalHandlerWrapper.loop.enterLoopMSecs(timeout);
QObject::disconnect(connection);
return signalHandlerWrapper.hasBeenCalled;
}
template <class Sender, class Signal>
bool waitForSignal(Sender &&sender, Signal &&signal, int timeout = 15000)
{
return waitForSignal(std::forward<Sender>(sender),
std::forward<Signal>(signal),
waitForSignal_DefaultSignalHandler(),
timeout);
}
#endif // !WAITFORSIGNAL_H
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