/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2006  Christophe Dumez <chris@qbittorrent.org>
 *
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */

#include "transferlistdelegate.h"

#include <QApplication>
#include <QModelIndex>
#include <QPainter>
#include <QStyleOptionViewItem>

#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
#include <QProxyStyle>
#endif

#include "base/utils/string.h"
#include "transferlistmodel.h"

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

void TransferListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    if (index.column() != TransferListModel::TR_PROGRESS) {
        QItemDelegate::paint(painter, option, index);
        return;
    }

    painter->save();

    QStyleOptionViewItem opt = QItemDelegate::setOptions(index, option);
    QItemDelegate::drawBackground(painter, opt, index);

    QStyleOptionProgressBar newopt;
    newopt.rect = opt.rect;
    newopt.text = index.data().toString();
    newopt.progress = static_cast<int>(index.data(TransferListModel::UnderlyingDataRole).toReal());
    newopt.maximum = 100;
    newopt.minimum = 0;
    newopt.state |= QStyle::State_Enabled;
    newopt.textVisible = true;

#if defined(Q_OS_WIN) || defined(Q_OS_MACOS)
    // XXX: To avoid having the progress text on the right of the bar
    QProxyStyle st("fusion");
    st.drawControl(QStyle::CE_ProgressBar, &newopt, painter);
#else
    QApplication::style()->drawControl(QStyle::CE_ProgressBar, &newopt, painter);
#endif
    painter->restore();
}

QWidget *TransferListDelegate::createEditor(QWidget *, const QStyleOptionViewItem &, const QModelIndex &) const
{
    // No editor here
    return nullptr;
}

QSize TransferListDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
{
    // Reimplementing sizeHint() because the 'name' column contains text+icon.
    // When that WHOLE column goes out of view(eg user scrolls horizontally)
    // the rows shrink if the text's height is smaller than the icon's height.
    // This happens because icon from the 'name' column is no longer drawn.

    static int nameColHeight = -1;
    if (nameColHeight == -1) {
        const QModelIndex nameColumn = index.sibling(index.row(), TransferListModel::TR_NAME);
        nameColHeight = QItemDelegate::sizeHint(option, nameColumn).height();
    }

    QSize size = QItemDelegate::sizeHint(option, index);
    size.setHeight(std::max(nameColHeight, size.height()));
    return size;
}