MapProxySource.h

/*
 * SPDX-FileCopyrightText: 2020 Arjen Hiemstra <ahiemstra@heimr.nl>
 *
 * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
#pragma once
 
#include "ChartDataSource.h"
 
#include <QVariant>
 
/**
 * A source that uses the values of another source to produce values from a map.
 *
 * This source reads values from another source, then uses those as an index to
 * a map of different values and returns the appropriate value from that map.
 * This source's itemCount matches that of the other source.
 *
 * @since 5.71
 */
class QUICKCHARTS_EXPORT MapProxySource : public ChartDataSource
{
    Q_OBJECT
    QML_ELEMENT
 
public:
    MapProxySource(QObject *parent = nullptr);
 
    /**
     * A ChartDataSource that is used as map indexes.
     */
    Q_PROPERTY(ChartDataSource *source READ source WRITE setSource NOTIFY sourceChanged)
    ChartDataSource *source() const;
    void setSource(ChartDataSource *newSource);
    Q_SIGNAL void sourceChanged();
 
    /**
     * The map to index for values.
     */
    Q_PROPERTY(QVariantMap map READ map WRITE setMap NOTIFY mapChanged)
    QVariantMap map() const;
    void setMap(const QVariantMap &newMap);
    Q_SIGNAL void mapChanged();
 
    virtual int itemCount() const override;
    virtual QVariant item(int index) const override;
    virtual QVariant minimum() const override;
    virtual QVariant maximum() const override;
 
private:
    ChartDataSource *m_source = nullptr;
    QVariantMap m_map;
};