/*
 *  This file is part of RawTherapee.
 *
 *  Copyright (c) 2004-2010 Gabor Horvath <hgabor@rawtherapee.com>
 *
 *  RawTherapee 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  RawTherapee 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 RawTherapee.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef _COLORPROVIDER_
#define _COLORPROVIDER_

#include <gtkmm.h>

class ColorProvider;

/*
 * The ColorCaller is the class that will query the ColorProvider
 */
class ColorCaller {
protected:
    // a class can handle several ColorCaller;
    // colorCallerId will let the provider identify the caller
    int colorCallerId;
    ColorProvider *colorProvider;

public:
    enum ElemType {
        CCET_POINT,
        CCET_VERTICAL_BAR,
        CCET_HORIZONTAL_BAR,
        CCET_BACKGROUND
    };
    double ccRed;
    double ccGreen;
    double ccBlue;
    double ccAlpha;

    ColorCaller()
        : colorCallerId(-1), colorProvider(nullptr), ccRed(0.), ccGreen(0.),
          ccBlue(0.), ccAlpha(0.)
    {
    }
    void setColorProvider(ColorProvider *p, int id)
    {
        colorProvider = p;
        colorCallerId = id;
    }
};

/*
 * Use it to let your widget feed a colored bar or graph lines with the wanted
 * colors If you doesn't need to dynamically feed a widget with colors (e.g.
 * curve's graph), you don't need to declare the instanciator class as BEING a
 * ColorProvider, you'll still be able to set gradients for e.g. ColoredBar(s)
 */
class ColorProvider {

public:
    virtual ~ColorProvider() {};
    virtual void colorForValue(double valX, double valY,
                               enum ColorCaller::ElemType elemType,
                               int callerId, ColorCaller *caller) {};
};

#endif
