File indexing completed on 2024-04-28 15:29:32 

0001 /*
0002  * This file is part of KQuickCharts
0003  * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl>
0004  *
0005  * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
0006  */
0007 
0008 #ifndef DATASOURCE_H
0009 #define DATASOURCE_H
0010 
0011 #include <QObject>
0012 
0013 /**
0014  * Abstract base class for data sources.
0015  */
0016 class ChartDataSource : public QObject
0017 {
0018     Q_OBJECT
0019 
0020 public:
0021     explicit ChartDataSource(QObject *parent = nullptr);
0022     virtual ~ChartDataSource() = default;
0023 
0024     virtual int itemCount() const = 0;
0025     virtual QVariant item(int index) const = 0;
0026     virtual QVariant minimum() const = 0;
0027     virtual QVariant maximum() const = 0;
0028 
0029     virtual QVariant first() const;
0030 
0031     Q_SIGNAL void dataChanged();
0032 
0033 protected:
0034     static bool variantCompare(const QVariant &lhs, const QVariant &rhs);
0035 };
0036 
0037 #endif // DATASOURCE_H