/* ============================================================
 *
 * This file is a part of digiKam project
 * http://www.digikam.org
 *
 * Date        : 2006-11-11
 * Description : a popup menu with a decorative graphic banner
 *               at the left border.
 * 
 * Copyright (C) 1996-2000 the kicker authors.
 * Copyright (C) 2005 Mark Kretschmann <markey@web.de>
 * Copyright (C) 2006-2008 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.
 * 
 * ============================================================ */

// TQt includes.

#include <tqpainter.h>
#include <tqpixmap.h>
#include <tqstyle.h>

// KDE includes.

#include <kapplication.h>
#include <kiconeffect.h>
#include <kapplication.h>
#include <kstandarddirs.h>
#include <kaboutdata.h>

// Local includes.

#include "dpopupmenu.h"

namespace Digikam
{

static TQImage s_dpopupmenu_sidePixmap;
static TQColor s_dpopupmenu_sidePixmapColor;

DPopupMenu::DPopupMenu(TQWidget* parent, const char* name)
          : KPopupMenu(parent, name)
{
    // Must be initialized so that we know the size on first invocation
    if ( s_dpopupmenu_sidePixmap.isNull() )
        generateSidePixmap();
}

DPopupMenu::~DPopupMenu()
{
}

void DPopupMenu::generateSidePixmap()
{
    const TQColor newColor = calcPixmapColor();

    if ( newColor != s_dpopupmenu_sidePixmapColor ) 
    {
        s_dpopupmenu_sidePixmapColor = newColor;

        if (KApplication::kApplication()->aboutData()->appName() == TQString("digikam"))
            s_dpopupmenu_sidePixmap.load( locate( "data","digikam/data/menusidepixmap.png" ) );
        else
            s_dpopupmenu_sidePixmap.load( locate( "data","showfoto/menusidepixmap.png" ) );

        KIconEffect::colorize(s_dpopupmenu_sidePixmap, newColor, 1.0);
    }
}

int DPopupMenu::sidePixmapWidth() const
{
    return s_dpopupmenu_sidePixmap.width();
}

TQRect DPopupMenu::sideImageRect() const
{
    return TQStyle::visualRect(TQRect(frameWidth(), frameWidth(),
                                    s_dpopupmenu_sidePixmap.width(),
                                    height() - 2*frameWidth()),
                              this);
}

TQColor DPopupMenu::calcPixmapColor()
{
    TQColor color;
    TQColor activeTitle   = TQApplication::palette().active().background();
    TQColor inactiveTitle = TQApplication::palette().inactive().background();

    // figure out which color is most suitable for recoloring to
    int h1, s1, v1, h2, s2, v2, h3, s3, v3;
    activeTitle.hsv(&h1, &s1, &v1);
    inactiveTitle.hsv(&h2, &s2, &v2);
    TQApplication::tqpalette().active().background().hsv(&h3, &s3, &v3);

    if ( (kAbs(h1-h3)+kAbs(s1-s3)+kAbs(v1-v3) < kAbs(h2-h3)+kAbs(s2-s3)+kAbs(v2-v3)) &&
            ((kAbs(h1-h3)+kAbs(s1-s3)+kAbs(v1-v3) < 32) || (s1 < 32)) && (s2 > s1))
        color = inactiveTitle;
    else
        color = activeTitle;

    // limit max/min brightness
    int r, g, b;
    color.rgb(&r, &g, &b);
    int gray = tqGray(r, g, b);
    if (gray > 180) 
    {
        r = (r - (gray - 180) < 0 ? 0 : r - (gray - 180));
        g = (g - (gray - 180) < 0 ? 0 : g - (gray - 180));
        b = (b - (gray - 180) < 0 ? 0 : b - (gray - 180));
    }
    else if (gray < 76) 
    {
        r = (r + (76 - gray) > 255 ? 255 : r + (76 - gray));
        g = (g + (76 - gray) > 255 ? 255 : g + (76 - gray));
        b = (b + (76 - gray) > 255 ? 255 : b + (76 - gray));
    }
    color.setRgb(r, g, b);

    return color;
}

void DPopupMenu::setMinimumSize(const TQSize & s)
{
    KPopupMenu::setMinimumSize(s.width() + s_dpopupmenu_sidePixmap.width(), s.height());
}

void DPopupMenu::setMaximumSize(const TQSize & s)
{
    KPopupMenu::setMaximumSize(s.width() + s_dpopupmenu_sidePixmap.width(), s.height());
}

void DPopupMenu::setMinimumSize(int w, int h)
{
    KPopupMenu::setMinimumSize(w + s_dpopupmenu_sidePixmap.width(), h);
}

void DPopupMenu::setMaximumSize(int w, int h)
{
  KPopupMenu::setMaximumSize(w + s_dpopupmenu_sidePixmap.width(), h);
}

void DPopupMenu::resizeEvent(TQResizeEvent * e)
{
    KPopupMenu::resizeEvent(e);

    setFrameRect(TQStyle::visualRect(TQRect(s_dpopupmenu_sidePixmap.width(), 0,
                                          width() - s_dpopupmenu_sidePixmap.width(), height()), 
                 this ) );
}

//Workaround TQt3.3.x sizing bug, by ensuring we're always wide enough.
void DPopupMenu::resize(int width, int height)
{
    width = kMax(width, maximumSize().width());
    KPopupMenu::resize(width, height);
}

void DPopupMenu::paintEvent(TQPaintEvent* e)
{
    generateSidePixmap();

    TQPainter p( this );

    TQRect r = sideImageRect();
    r.setTop(r.bottom()-s_dpopupmenu_sidePixmap.height()+1);
    if ( r.intersects( e->rect() ) )
    {
        TQRect drawRect = r.intersect(e->rect()).intersect(sideImageRect());
        TQRect pixRect  = drawRect;
        pixRect.moveBy(-r.left(), -r.top());
        p.drawImage(drawRect.topLeft(), s_dpopupmenu_sidePixmap, pixRect);
    }

    p.setClipRegion(e->region());

    //NOTE: The order is important here. drawContents() must be called before drawPrimitive(),
    //      otherwise we get rendering glitches.

    drawContents(&p);

    style().tqdrawPrimitive(TQStyle::PE_PanelPopup, &p,
                          TQRect(0, 0, width(), height()),
                          colorGroup(), TQStyle::Style_Default,
                          TQStyleOption( frameWidth(), 0));
}

}  // namespace Digikam
