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/***************************************************************************** |
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* |
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* Copyright (C) 2009 - 2022 Bjarne von Horn <vh@igh.de> |
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* |
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* This file is part of the QtPdCom library. |
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* |
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* The QtPdCom library is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU Lesser General Public License as published by |
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* the Free Software Foundation, either version 3 of the License, or (at your |
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* option) any later version. |
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* |
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* The QtPdCom library is distributed in the hope that it will be useful, but |
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
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* License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with the QtPdCom Library. If not, see <http://www.gnu.org/licenses/>. |
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* |
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****************************************************************************/ |
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#ifndef QTPDCOM_FUTUREWATCHERS_H |
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#define QTPDCOM_FUTUREWATCHERS_H |
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#include <QFutureWatcher> |
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#include <pdcom5/Variable.h> |
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#include "VariableList.h" |
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#include "Export.h" |
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#include "FutureWatchersDetails.h" |
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namespace QtPdCom { |
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/** |
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* Convenience class for processing the result of Process::findQt() |
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* |
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* Let's say you have a Widget which needs to process a PdCom::Variable |
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* instance. |
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* |
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* |
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* @code |
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* |
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* class MyWidget : public QObject |
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* { |
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* Q_OBJECT |
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* |
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* public: |
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* MyWidget(QObject *parent) : QObject(parent) {} |
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* |
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* void setVariable(QtPdCom::Process& proc, QString path) |
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* { |
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* const auto watcher = new QtPdCom::VariableWatcher(this); |
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* // this will be fired when the result has arrived |
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* connect(watcher, &QtPdCom::VariableWatcher::finished, |
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* this, &MyWidget::onVariableFound); |
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* // delete watcher if Process is resetted in the meantime |
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* connect(watcher, &QtPdCom::VarableWatcher::cancelled, |
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* watcher, &QObject::deleteLater); |
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* // start watching |
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* watcher->setFuture(proc.find(path)); |
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* } |
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* |
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* private slots: |
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* void onVariableFound() |
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* { |
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* const auto watcher = |
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* qobject_cast<QtPdCom::FindVariableWatcher*>(QObject::sender()); if |
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* (!watcher) return; |
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* // fetch result from watcher |
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* const PdCom::Variable result = watcher->result(); |
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* watcher->deleteLater(); |
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* // handle result |
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* } |
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* }; |
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* |
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* |
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* @endcode |
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* |
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* |
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*/ |
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class QTPDCOM_PUBLIC VariableWatcher: public QFutureWatcher<PdCom::Variable> |
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{ |
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Q_OBJECT |
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public: |
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using QFutureWatcher<PdCom::Variable>::QFutureWatcher; |
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}; |
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class QTPDCOM_PUBLIC ListWatcher: public QFutureWatcher<VariableList> |
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{ |
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Q_OBJECT |
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public: |
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using QFutureWatcher<VariableList>::QFutureWatcher; |
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}; |
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template< class Result,class Object, class Callback> |
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inline QFutureWatcher<Result>& createWatcher(Object *obj, Callback &&callback) |
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{ |
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const auto watcher = new QFutureWatcher<Result>(obj); |
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QObject::connect( |
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watcher, |
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&QFutureWatcherBase::finished, |
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obj, |
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[callback, watcher, obj]() { |
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details::invoke<Result, Object>::call(callback, *obj, watcher); |
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watcher->deleteLater(); |
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}); |
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QObject::connect( |
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watcher, |
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&QFutureWatcherBase::canceled, |
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watcher, |
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&QObject::deleteLater); |
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return *watcher; |
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} |
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} // namespace QtPdCom |
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#endif // QTPDCOM_FUTUREWATCHERS_H |
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