ChartDataSource.h

/*
 * This file is part of KQuickCharts
 * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
 *
 * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
 */
 
#ifndef DATASOURCE_H
#define DATASOURCE_H
 
#include <QObject>
#include <qqmlregistration.h>
 
#include "quickcharts_export.h"
 
/**
 * Abstract base class for data sources.
 */
class QUICKCHARTS_EXPORT ChartDataSource : public QObject
{
    Q_OBJECT
    QML_NAMED_ELEMENT(DataSource)
    QML_UNCREATABLE("Abstract Base Class")
 
public:
    explicit ChartDataSource(QObject *parent = nullptr);
    virtual ~ChartDataSource() = default;
 
    virtual int itemCount() const = 0;
    virtual QVariant item(int index) const = 0;
    virtual QVariant minimum() const = 0;
    virtual QVariant maximum() const = 0;
 
    virtual QVariant first() const;
 
    Q_SIGNAL void dataChanged();
 
protected:
    static bool variantCompare(const QVariant &lhs, const QVariant &rhs);
};
 
#endif // DATASOURCE_H