/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.io
**
** This file is part of the Qt Charts module.
**
** Licensees holding valid commercial license for Qt may use this file in
** accordance with the Qt License Agreement provided with the Software
** or, alternatively, in accordance with the terms contained in a written
** agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.io
**
****************************************************************************/

//  W A R N I N G
//  -------------
//
// This file is not part of the Qt Enterprise Chart API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef CHARTTHEMEMANAGER_H
#define CHARTTHEMEMANAGER_H

#include <QtCharts/QChartGlobal>
#include <QtCharts/QChart>
#include <QtGui/QColor>
#include <QtGui/QGradientStops>

QT_CHARTS_BEGIN_NAMESPACE
class ChartTheme;

class ChartThemeManager: public QObject
{
    Q_OBJECT
public:
    enum BackgroundShadesMode {
        BackgroundShadesNone = 0,
        BackgroundShadesVertical,
        BackgroundShadesHorizontal,
        BackgroundShadesBoth
    };

public:
    explicit ChartThemeManager(QChart* chart);
    void setTheme(QChart::ChartTheme theme);
    ChartTheme* theme() const { return m_theme.data(); }
    void decorateChart(QChart *chart, ChartTheme* theme) const;
    void decorateLegend(QLegend *legend, ChartTheme* theme) const;
    void updateSeries(QAbstractSeries *series);

public:
    static QList<QGradient> generateSeriesGradients(const QList<QColor>& colors);
    static QColor colorAt(const QColor &start, const QColor &end, qreal pos);
    static QColor colorAt(const QGradient &gradient, qreal pos);

private:
    int createIndexKey(QList<int> keys) const;
    int seriesCount(QAbstractSeries::SeriesType type) const;

public Q_SLOTS:
    void handleSeriesAdded(QAbstractSeries *series);
    void handleSeriesRemoved(QAbstractSeries *series);
    void handleAxisAdded(QAbstractAxis *axis);
    void handleAxisRemoved(QAbstractAxis *axis);

protected:
    QScopedPointer<ChartTheme> m_theme;
    QMap<QAbstractSeries *,int> m_seriesMap;
    QList<QAbstractAxis *> m_axisList;
    QChart* m_chart;
};

QT_CHARTS_END_NAMESPACE

#endif // CHARTTHEME_H