ObserverList.h

/***************************************************************************
 *   Copyright (C) 2025 by Stefan Kebekus                                  *
 *   stefan.kebekus@gmail.com                                              *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 3 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program 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 General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
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 ***************************************************************************/
 
#pragma once
 
#include "weather/Observer.h"
 
namespace Weather {

 
class ObserverList : public QObject {
    Q_OBJECT
    QML_ELEMENT
 
public:
    //
    // Constructors and destructors
    //

    explicit ObserverList(QObject* parent=nullptr);

    ~ObserverList() override;
 
 
    //
    // Properties
    //

    Q_PROPERTY(QList<Weather::Observer*> observers READ observers BINDABLE bindableObservers)
 
 
    //
    // Getter Methods
    //
 
    
    [[nodiscard]] QList<Weather::Observer*> observers() {return m_observers.value();}

    [[nodiscard]] QBindable<QList<Weather::Observer*>> bindableObservers() const {return &m_observers;}
 
 
private:
    Q_DISABLE_COPY_MOVE(ObserverList)
 
    // Observers by ICAO-Id. This map is used to store Observer instances.
    QMap<QString,Weather::Observer*> m_observersByID;
 
    // Currently active observers. This list is updated by a binding that
    // watches GlobalObject::weatherDataProvider, creates observer instances if
    // needed and stores them in m_observersByID.
    QProperty<QList<Weather::Observer*>> m_unsortedObservers;
 
    // Incremented whenever the aviation data changes. Read by the binding of
    // m_unsortedObservers, so that stations resolved through
    // GeoMapProvider::findByID() appear once the maps have been loaded.
    QProperty<int> m_mapRevision {0};
 
    // Currently active observers, sorted by distance. This list is updated by a
    // binding that watches m_unsortedObservers and the current position.
    QProperty<QList<Weather::Observer*>> m_observers;
};
 
} // namespace Weather