/********************************************************************
 KWin - the KDE window manager
 This file is part of the KDE project.

Copyright (C) 2009 Martin Gräßlin <kde@martin-graesslin.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 of the License, 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.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*********************************************************************/
#include "decorationdelegate.h"
#include "decorationmodel.h"
#include <QPainter>
#include <QSortFilterProxyModel>
#include <QApplication>

namespace KWin
{

const int margin = 5;

DecorationDelegate::DecorationDelegate( QObject* parent )
    : QStyledItemDelegate( parent )
    {
    }

DecorationDelegate::~DecorationDelegate()
    {
    }

void DecorationDelegate::paint( QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index ) const
    {
    // highlight selected item
    QApplication::style()->drawControl( QStyle::CE_ItemViewItem, &option, painter );

    QPixmap pixmap = index.model()->data( index, DecorationModel::PixmapRole ).value<QPixmap>();

    const QSize previewArea = option.rect.size() - QSize( 2*margin, 2*margin );
    if( pixmap.isNull() || pixmap.size() != previewArea )
        {
        emit regeneratePreview( static_cast< const QSortFilterProxyModel* >( index.model() )->mapToSource( index ),
                                previewArea );
        }
    else
        painter->drawPixmap( option.rect.topLeft() + QPoint( margin, margin ), pixmap );
    }

QSize DecorationDelegate::sizeHint( const QStyleOptionViewItem& option, const QModelIndex& index ) const
    {
    Q_UNUSED( option )
    Q_UNUSED( index )
    return QSize( 450, 150 );
    }

} // namespace KWin
