scalarobserver.h

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// SPDX-FileCopyrightText: Copyright (C) 2017 swift Project Community / Contributors
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-swift-pilot-client-1
 
 
#ifndef SWIFT_MISC_SHAREDSTATE_SCALAROBSERVER_H
#define SWIFT_MISC_SHAREDSTATE_SCALAROBSERVER_H
 
#include <QMutex>
#include <QObject>
 
#include "misc/sharedstate/activeobserver.h"
#include "misc/swiftmiscexport.h"
#include "misc/variant.h"
 
namespace swift::misc::shared_state
{
    class IDataLink;
 
    class SWIFT_MISC_EXPORT CGenericScalarObserver : public QObject
    {
        Q_OBJECT
 
    public:
        void initialize(IDataLink *);
 
    protected:
        CGenericScalarObserver(QObject *parent) : QObject(parent) {}
 
        CVariant value() const;
 
    private:
        void reconstruct();
        void handleEvent(const CVariant &param);
        virtual void onGenericValueChanged(const CVariant &value) = 0;
 
        QSharedPointer<CActiveObserver> m_observer =
            CActiveObserver::create(this, &CGenericScalarObserver::handleEvent);
        mutable QMutex m_valueMutex;
        CVariant m_value;
    };
 
    template <typename T>
    class CScalarObserver : public CGenericScalarObserver
    {
    protected:
        CScalarObserver(QObject *parent) : CGenericScalarObserver(parent) {}
 
    public:
        T value() const { return CGenericScalarObserver::value().template to<T>(); }
 
    private:
        virtual void onValueChanged(const T &value) = 0;
 
        virtual void onGenericValueChanged(const CVariant &value) override final { onValueChanged(value.to<T>()); }
    };
} // namespace swift::misc::shared_state
 
#endif // SWIFT_MISC_SHAREDSTATE_SCALAROBSERVER_H