/* This file is part of the KDE libraries
    Copyright (C) 1999 Waldo Bastian (bastian@kde.org)

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; version 
    2 of the License.

    This library 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
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/
//-----------------------------------------------------------------------------
// KDE color palette.

#ifndef KDELIBS_KPALETTE_H
#define KDELIBS_KPALETTE_H

#include <qcolor.h>
#include <qptrlist.h>
#include <qstring.h>
#include <qstringlist.h>
#include "kdelibs_export.h"

class KPalettePrivate;

/**
 * Class for handling Palettes.
 *
 * This class makes it easy to handle palettes.
 * A palette is a set of colors. This class can read
 * and write palettes from and to a file.
 *
 * This class uses the "GIMP" palette file format.
 *
 * This class is totally unrelated to QPalette.
 *
 * @author Waldo Bastian (bastian@kde.org)
 **/
class KDECORE_EXPORT KPalette
{
public:
   /**
    * Query which KDE palettes are installed.
    *
    * @return A list with a palette names.
    */
   static QStringList getPaletteList();

   /**
    * KPalette constructor. Creates a KPalette from a file
    * the filename is derived from the name.
    * @param name The name of palette as returned by getPaletteList()
    **/
   KPalette(const QString &name=QString::null);

   /**
    * KPalette copy constructor.
    **/
   KPalette(const KPalette &);

   /**
    * KPalette destructor.
    **/
   virtual ~KPalette();
   
   /**
    * KPalette assignment operator
    **/
   KPalette& operator=( const KPalette &);

   /**
    * Save the palette
    *
    * @return 'true' if successful
    **/
   bool save();

   /**
    * Get the description of the palette.
    * @return the description of the palette.
    **/
   QString description() const
   	{ return mDesc; }

   /**   	
    * Set the description of the palette.
    * @param desc the new description
    **/
   void setDescription(const QString &desc)
   	{ mDesc = desc; }
   
   /**
    * Get the name of the palette. 
    * @return the name of the palette
    **/
   QString name() const
   	{ return mName; }

   /**
    * Set the name of the palette.
    * @param name the name of the palette
    **/
   void setName(const QString &name)
   	{ mName = name; }

   /**
    * Used to specify whether a palette may be edited.
    * @see editable()
    * @see setEditable()
    */
   enum Editable { Yes, ///< Palette may be edited 
		   No,  ///< Palette may not be edited
		   Ask  ///< Ask user before editing
   };
  
   /**
    * Returns whether the palette may be edited.
    * @return the state of the palette
    **/
   Editable editable() const
   	{ return mEditable; }

   /**
    * Change whether the palette may be edited.
    * @param editable the state of the palette
    **/
   void setEditable(Editable editable)
   	{ mEditable = editable; }
   
   /**
    * Return the number of colors in the palette.
    * @return the number of colors
    **/
   int nrColors() const
   	{ return (int) mKolorList.count(); }

   /**
    * Find color by index.
    * @param index the index of the desired color
    * @return The @p index -th color of the palette, null if not found.
    **/
   QColor color(int index);
   
   /**
    * Find index by @p color.
    * @param color the color to find
    * @return The index of the color in the palette or -1 if the
    * color is not found.
    **/
   int findColor(const QColor &color) const;

   /**
    * Find color name by @p index.
    * @param index the index of the color
    * @return The name of the @p index -th color.
    * Note that not all palettes have named the colors. Null is
    * returned if the color does not exist or has no name.
    **/
   QString colorName(int index);
   
   /**
    * Find color name by @p color.
    * @return The name of color according to this palette.
    * Note that not all palettes have named the colors.
    * Note also that each palette can give the same color
    * a different name.
    **/
   QString colorName(const QColor &color)
   	{ return colorName( findColor(color)); }
   
   /**
    * Add a color.
    * @param newColor The color to add.
    * @param newColorName The name of the color, null to remove 
    *                     the name.
    * @return The index of the added color.
    **/
   int addColor(const QColor &newColor, 
                const QString &newColorName = QString::null);

   /**
    * Change a color.
    * @param index Index of the color to change
    * @param newColor The new color.
    * @param newColorName The new color name, null to remove 
    *                     the name.
    * @return The index of the new color or -1 if the color couldn't
    * be changed.
    **/
   int changeColor(int index, 
                   const QColor &newColor, 
                   const QString &newColorName = QString::null);
 
   /**
    * Change a color.
    * @param oldColor The original color
    * @param newColor The new color.
    * @param newColorName The new color name, null to remove 
    *                     the name.
    * @return The index of the new color or -1 if the color couldn't
    * be changed.
    **/
   int changeColor(const QColor &oldColor, 
                   const QColor &newColor, 
                   const QString &newColorName = QString::null)
   	{ return changeColor( findColor(oldColor), newColor, newColorName); }

private:   
   typedef struct { QColor color; QString name; } kolor;
   QPtrList<kolor> mKolorList;
   
   QString mName;
   QString mDesc;
   Editable mEditable;

   KPalettePrivate *d;
};


#endif		// KDELIBS_KPALETTE_H

