| 1 | /* |
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| 2 | * This file is part of KQuickCharts |
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| 3 | * SPDX-FileCopyrightText: 2019 Arjen Hiemstra <ahiemstra@heimr.nl> |
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| 4 | * |
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| 5 | * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL |
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| 6 | */ |
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| 7 | |
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| 8 | #ifndef DATASOURCE_H |
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| 9 | #define DATASOURCE_H |
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| 10 | |
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| 11 | #include <QObject> |
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| 12 | #include <qqmlregistration.h> |
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| 13 | |
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| 14 | #include "quickcharts_export.h" |
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| 15 | |
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| 16 | /*! |
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| 17 | * \qmltype ChartDataSource |
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| 18 | * \inqmlmodule org.kde.quickcharts |
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| 19 | * |
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| 20 | * \brief Abstract base class for data sources. |
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| 21 | * |
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| 22 | * This is a common base class for all data sources. It cannot be created from |
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| 23 | * QML. |
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| 24 | */ |
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| 25 | class QUICKCHARTS_EXPORT ChartDataSource : public QObject |
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| 26 | { |
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| 27 | Q_OBJECT |
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| 28 | QML_NAMED_ELEMENT(DataSource) |
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| 29 | QML_UNCREATABLE("Abstract Base Class" ) |
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| 30 | |
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| 31 | public: |
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| 32 | explicit ChartDataSource(QObject *parent = nullptr); |
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| 33 | virtual ~ChartDataSource() = default; |
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| 34 | |
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| 35 | virtual int itemCount() const = 0; |
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| 36 | virtual QVariant item(int index) const = 0; |
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| 37 | virtual QVariant minimum() const = 0; |
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| 38 | virtual QVariant maximum() const = 0; |
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| 39 | |
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| 40 | virtual QVariant first() const; |
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| 41 | |
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| 42 | Q_SIGNAL void dataChanged(); |
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| 43 | |
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| 44 | protected: |
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| 45 | static bool variantCompare(const QVariant &lhs, const QVariant &rhs); |
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| 46 | }; |
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| 47 | |
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| 48 | #endif // DATASOURCE_H |
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| 49 | |
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