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/******************************************************************************
* Copyright (C) 2019 Kitsune Ral <kitsune-ral@users.sf.net>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#pragma once
#include "util.h"
#include <QtCore/QPointer>
namespace Quotient {
namespace _impl {
template <typename SenderT, typename SignalT, typename ContextT, typename... ArgTs>
inline QMetaObject::Connection
connectUntil(SenderT* sender, SignalT signal, ContextT* context,
std::function<bool(ArgTs...)> slot, Qt::ConnectionType connType)
{
// See https://bugreports.qt.io/browse/QTBUG-60339
#if QT_VERSION < QT_VERSION_CHECK(5, 10, 0)
auto pc = std::make_shared<QMetaObject::Connection>();
#else
auto pc = std::make_unique<QMetaObject::Connection>();
#endif
auto& c = *pc; // Resolve a reference before pc is moved to lambda
c = QObject::connect(
sender, signal, context,
[pc = std::move(pc), slot](ArgTs... args) {
Q_ASSERT(*pc); // If it's been triggered, it should exist
if (slot(std::forward<ArgTs>(args)...))
QObject::disconnect(*pc);
},
connType);
return c;
}
} // namespace _impl
template <typename SenderT, typename SignalT, typename ContextT, typename FunctorT>
inline auto connectUntil(SenderT* sender, SignalT signal, ContextT* context,
const FunctorT& slot,
Qt::ConnectionType connType = Qt::AutoConnection)
{
return _impl::connectUntil(
sender, signal, context,
typename function_traits<FunctorT>::function_type(slot), connType);
}
/** Create a single-shot connection that triggers on the signal and
* then self-disconnects
*
* Only supports DirectConnection type.
*/
template <typename SenderT, typename SignalT, typename ReceiverT, typename SlotT>
inline auto connectSingleShot(SenderT* sender, SignalT signal,
ReceiverT* receiver, SlotT slot)
{
QMetaObject::Connection connection;
connection = QObject::connect(sender, signal, receiver, slot,
Qt::DirectConnection);
Q_ASSERT(connection);
QObject::connect(
sender, signal, receiver,
[connection] { QObject::disconnect(connection); }, Qt::DirectConnection);
return connection;
}
/** A guard pointer that disconnects an interested object upon destruction
* It's almost QPointer<> except that you have to initialise it with one
* more additional parameter - a pointer to a QObject that will be
* disconnected from signals of the underlying pointer upon the guard's
* destruction.
*/
template <typename T>
class ConnectionsGuard : public QPointer<T> {
public:
ConnectionsGuard(T* publisher, QObject* subscriber)
: QPointer<T>(publisher), subscriber(subscriber)
{}
~ConnectionsGuard()
{
if (*this)
(*this)->disconnect(subscriber);
}
ConnectionsGuard(ConnectionsGuard&&) = default;
ConnectionsGuard& operator=(ConnectionsGuard&&) = default;
Q_DISABLE_COPY(ConnectionsGuard)
using QPointer<T>::operator=;
private:
QObject* subscriber;
};
} // namespace Quotient
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