/* -*- C++ -*-

   This file implements the SMIVItemDelegate class.

   $ Author: Mirko Boehm $
   $ Copyright: (C) 2005, Mirko Boehm $
   $ Contact: mirko@kde.org
         http://www.kde.org
         http://www.hackerbuero.org $
   $ License: LGPL with the following explicit clarification:
         This code may be linked against any version of the Qt toolkit
         from Trolltech, Norway. $

   $Id: SMIVItemDelegate.cpp 30 2005-08-16 16:16:04Z mirko $
*/

#include <QtCore/QModelIndex>
#include <QPainter>

#include "ItemDelegate.h"
#include "Image.h"
#include "Model.h"

const int ItemDelegate::FrameWidth = 2;
const int ItemDelegate::TextMargin = 6;
const int ItemDelegate::Margin = 3;

ItemDelegate::ItemDelegate( QObject *parent )
    : QItemDelegate ( parent )
{
}

void ItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    const bool itemIsSelected = option.showDecorationSelected && (option.state & QStyle::State_Selected);
    const Image* image = index.data(Model::Role_ImageRole).value<const Image*>();
    // calculate some constants:
    const int y0 = option.rect.top();
    const int x0 = option.rect.left();
    const int width = option.rect.width();
    // const int height = option.rect.height();

    painter->save();

    // draw the background color, depending on focus:
    if (itemIsSelected) {
        QPalette::ColorGroup cg = option.state & QStyle::State_Enabled ? QPalette::Normal : QPalette::Disabled;
        painter->fillRect(option.rect, option.palette.brush(cg, QPalette::Highlight));
    }

    // draw the image frame:
    painter->setPen(Qt::blue);
    painter->setBrush( Qt::white );
    painter->drawRect(x0 + FrameWidth + Margin, y0 + FrameWidth + Margin,
                      Image::ThumbWidth + 1,  Image::ThumbHeight + 1);

    // draw the image:
    if (image->progress().first >= Image::Step_LoadImage) {
        const QImage& thumb = image->thumbNail();
        QPoint orig = QPoint(x0 + FrameWidth + Margin + 1, y0 + FrameWidth + Margin + 1);
        painter->drawImage(orig,  thumb, QRect ( 0, qMax(0, (thumb.height() - Image::ThumbHeight)/2),
                                                 Image::ThumbWidth,  Image::ThumbHeight));
    }

    // render the text next to the image:
    painter->setPen(Qt::black);
    QFontMetrics font1Metrics(option.font);
    int textx0 = x0 + FrameWidth + Margin + Image::ThumbWidth + TextMargin;
    QRect text1Rect = QRect(textx0, y0 + TextMargin, width - TextMargin - textx0, font1Metrics.lineSpacing());
    painter->drawText(text1Rect, image->description());
    if (itemIsSelected) {
        painter->setPen(Qt::white);
    } else {
        painter->setPen(Qt::darkGray);
    }
    QFont font2 = option.font;
    font2.setPointSize((int) (0.9 * option.font.pointSize()));
    painter->setFont(font2);
    QFontMetrics font2Metrics(font2);
    QRect text2Rect = text1Rect.adjusted(0, font1Metrics.lineSpacing(), 0, font2Metrics.lineSpacing());
    painter->drawText(text2Rect, image->details());
    QRect text3Rect = text2Rect.adjusted(0, font2Metrics.lineSpacing(), 0, font2Metrics.lineSpacing());
    painter->drawText(text3Rect, image->details2());

    painter->restore();
}

QSize ItemDelegate::sizeHint(const QStyleOptionViewItem&, const QModelIndex&) const
{
    static const int Width = Image::ThumbWidth + 2 * FrameWidth + 2 * Margin + 2;
    static const int Height = Image::ThumbHeight + 2 * FrameWidth + 2 * Margin + 2;
    return QSize(Width, Height);
}

