/*
                             This file is part of the Opie Project
                             Copyright (C) Robert Griebl <sandman@handhelds.org>
              =.             Copyright (C) The Opie Team <opie-devel@handhelds.org>
            .=l.
     .>+-=
_;:,   .>  :=|.         This program is free software; you can
.> <`_,  > .  <=          redistribute it and/or  modify it under
:`=1 )Y*s>-.--  :           the terms of the GNU Library General Public
.="- .-=="i,   .._         License as published by the Free Software
- .  .-<_>   .<>         Foundation; either version 2 of the License,
  ._= =}    :          or (at your option) any later version.
  .%`+i>    _;_.
  .i_,=:_.   -<s.       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
..}^=.=    =    ;      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., 59 Temple Place - Suite 330,
                             Boston, MA 02111-1307, USA.
*/

#include "ocolorpopupmenu.h"
#include "ocolorbutton.h"

/* OPIE */

/* QT */
#include <qimage.h>

using namespace Opie;

struct OColorButtonPrivate
{
    QPopupMenu *m_menu;
    QColor m_color;
};

/**
 * This concstructs a Color Button with @param color as the start color
 * It'll use a OColorPopupMenu internally
 *
 * @param parent The parent of the Color Button
 * @param color The color from where to start on
 * @param name @see QObject
 */
OColorButton::OColorButton ( QWidget *parent, const QColor &color, const char *name )
        : QPushButton ( parent, name )
{
    d = new OColorButtonPrivate;

    d-> m_menu = new OColorPopupMenu ( color, 0, 0 );
    setPopup ( d-> m_menu );
    //	setPopupDelay ( 0 );
    connect ( d-> m_menu, SIGNAL( colorSelected(const QColor&)), this, SLOT( updateColor(const QColor&)));


    QSize s = sizeHint ( ) + QSize ( 12, 0 );
    setMinimumSize ( s );
    setMaximumSize ( s. width ( ) * 2, s. height ( ));
    d->m_color = color;
}

/**
 * This destructs the object
 */
OColorButton::~OColorButton ( )
{
    delete d->m_menu;
    delete d;
}

/**
 * @return Returns the current color of the button
 */
QColor OColorButton::color ( ) const
{
    return d-> m_color;
}

/**
 * This method sets the color of the button
 * @param c The color to be set.
 */
void OColorButton::setColor ( const QColor &c )
{
    updateColor ( c, true );
}

/**
 * @internal
 */
void OColorButton::updateColor ( const QColor &c )
{
    updateColor( c, true );
}

void OColorButton::updateColor ( const QColor &c, bool sendSignal )
{
    d-> m_color = c;

    QImage img ( width()-14, height()-6, 32 );
    img. fill ( 0 );

    int r, g, b;
    c. rgb ( &r, &g, &b );

    int w = img. width ( );
    int h = img. height ( );

    int dx = w * 20 / 100; // 15%
    int dy = h * 20 / 100;

    for ( int y = 0; y < h; y++ )
    {
        for ( int x = 0; x < w; x++ )
        {
            double alpha = 1.0;

            if ( x < dx )
                alpha *= ( double ( x + 1 ) / dx );
            else if ( x >= w - dx )
                alpha *= ( double ( w - x ) / dx );
            if ( y < dy )
                alpha *= ( double ( y + 1 ) / dy );
            else if ( y >= h - dy )
                alpha *= ( double ( h - y ) / dy );

            int a = int ( alpha * 255.0 );
            if ( a < 0 )
                a = 0;
            if ( a > 255 )
                a = 255;

            img. setPixel ( x, y, qRgba ( r, g, b, a ));
        }
    }
    img. setAlphaBuffer ( true );

    QPixmap pix;
    pix. convertFromImage ( img );
    setPixmap ( pix );

    if ( sendSignal )
        emit colorSelected ( c );
}


/**
 * @internal
 */
void OColorButton::resizeEvent( QResizeEvent *ev ) {
    QPushButton::resizeEvent( ev );
    updateColor( d->m_color, false );
}