/*
 *  Copyright (c) 2005 Bart Coppens <kde@bartcoppens.be>
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */

#ifndef _KIS_HISTOGRAM_VIEW_
#define _KIS_HISTOGRAM_VIEW_

#include <QLabel>
#include <QPixmap>
#include <QVector>
#include <QStringList>
#include <QMouseEvent>

#include "kis_types.h"
#include "KoHistogramProducer.h"
#include "kis_histogram.h"

#include <krita_export.h>


class KoChannelInfo;

/**
 * This class displays a histogram. It has a list of channels it can
 * select. The easy way is to display channelStrings() to the user,
 * and then use a setActiveChannel with the integer the same as the
 * one the selected string in that stringlist has. If the selected one
 * is a producer, the histogram will automatically display all its
 * channels, and color them if that is possible.
 *
 * You can also set the channels manually, just don't forget that the
 * displayed channels all need to belong to the same producer! If you
 * set them manually, don't forget to set the (non)usage of color as
 * well.
 *
 * You can either set this to use a specific layer, or use a specific
 * histogram. With the latter, some functionality will disappear, like
 * listProducers(). Setting a histogram will discard info on the
 * layer, and setting a layer will discard info on the histogram.
 *
 * XXX: make beautiful, for instance by using alpha and a bit of a
 * gradient!
 **/
class KRITAUI_EXPORT KisHistogramView : public QLabel
{
    Q_OBJECT

public:

    KisHistogramView(QWidget *parent = 0, const char *name = 0, Qt::WFlags f = 0);

    virtual ~KisHistogramView();

    void setPaintDevice(KisPaintDeviceSP dev, const QRect &bounds);

    void setHistogram(KisHistogramSP histogram);

    void setView(double from, double size);

    KoHistogramProducerSP currentProducer();

    QStringList channelStrings();

    /** Lists all producers currently available */
    QList<QString> producers();

    /** Sets the currently displayed channels to channels of the producer with producerID as ID*/
    void setCurrentChannels(const KoID& producerID, QList<KoChannelInfo *> channels);

    /** Be careful, producer will be modified */
    void setCurrentChannels(KoHistogramProducerSP producer, QList<KoChannelInfo *> channels);

    bool hasColor();

    void setColor(bool set);

public slots:

    void setActiveChannel(int channel);

    void setHistogramType(enumHistogramType type);

    void updateHistogram();

signals:

    void rightClicked(const QPoint& pos);

protected:

    virtual void mousePressEvent(QMouseEvent * e);

private:

    void setChannels();

    void addProducerChannels(KoHistogramProducerSP producer);

    typedef struct {
        bool isProducer;
        KoHistogramProducerSP producer;
        KoChannelInfo * channel;
    } ComboboxInfo;

    QVector<ComboboxInfo> m_comboInfo;
    QPixmap m_pix;
    KisHistogramSP m_histogram;
    const KoColorSpace* m_cs;
    KoHistogramProducerSP m_currentProducer;
    QList<KoChannelInfo *> m_channels;
    // Maps the channels in m_channels to a real channel offset in the producer->channels()
    QVector<qint32> m_channelToOffset;
    QStringList m_channelStrings;
    bool m_color;
    double m_from;
    double m_width;
};

#endif // _KIS_HISTOGRAM_VIEW_
