curveswidget.h

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/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2004-12-01
 * Description : a widget to draw histogram curves
 *
 * Copyright (C) 2004-2022 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * 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, 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.
 *
 * ============================================================ */
 
#ifndef DIGIKAM_CURVES_WIDGET_H
#define DIGIKAM_CURVES_WIDGET_H
 
// Qt includes
 
#include <QWidget>
#include <QEvent>
#include <QMouseEvent>
#include <QPaintEvent>
 
// Local includes
 
#include "dcolor.h"
#include "digikam_export.h"
#include "digikam_globals.h"
 
class KConfigGroup;
 
namespace Digikam
{
 
class ImageCurves;
class DImg;
 
class DIGIKAM_EXPORT CurvesWidget : public QWidget
{
    Q_OBJECT
 
public:
 
    explicit CurvesWidget(int w, int h, QWidget* const parent, bool readOnly=false);
    ~CurvesWidget() override;
 
    void setup(int w, int h, bool readOnly);
 
    void saveCurve(KConfigGroup& group, const QString& prefix);
 
    void restoreCurve(KConfigGroup& group, const QString& prefix);
 
    void updateData(const DImg& img);
 
    void stopHistogramComputation();
 
    void setDataLoading();
    void setLoadingFailed();
 
    void reset();
 
    void resetUI();
    void curveTypeChanged();
    void setCurveGuide(const DColor& color);
 
    ImageCurves* curves() const;
    bool isSixteenBits()  const;
 
Q_SIGNALS:
 
    void signalMouseMoved(int x, int y);
    void signalCurvesChanged();
    void signalHistogramComputationDone();
    void signalHistogramComputationFailed();
 
public Q_SLOTS:
 
    void setChannelType(ChannelType channel);
    void setScaleType(HistogramScale scale);
 
protected Q_SLOTS:
 
    void slotProgressTimerDone();
    void slotCalculationStarted();
    void slotCalculationFinished(bool success);
 
protected:
 
    void paintEvent(QPaintEvent*)           override;
    void mousePressEvent(QMouseEvent*)      override;
    void mouseReleaseEvent(QMouseEvent*)    override;
    void mouseMoveEvent(QMouseEvent*)       override;
    void leaveEvent(QEvent*)                override;
 
private:
 
    class Private;
    Private* const d;
};
 
} // namespace Digikam
 
#endif // DIGIKAM_CURVES_WIDGET_H