/*
 *  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 <https://www.gnu.org/licenses/>.
 */
#pragma once

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;

    ColorCaller() : colorCallerId(-1), colorProvider(nullptr), ccRed(0.), ccGreen(0.), ccBlue(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() = default;
    virtual void colorForValue (double valX, double valY, enum ColorCaller::ElemType elemType, int callerId, ColorCaller* caller) {};
};