blame: src/thumbnaildelegate.cpp

/*

MIT License

Copyright (c) 2026 Poul Sander

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

*/

#include "thumbnaildelegate.h"

#include <QPainter>

#include <QApplication>

#include <QStyle>

#include <QTextOption>

#include <QFontMetrics>

ThumbnailDelegate::ThumbnailDelegate(QObject *parent)

    : QStyledItemDelegate(parent)

{

}

void ThumbnailDelegate::paint(QPainter *painter,

                              const QStyleOptionViewItem &option,

                              const QModelIndex &index) const

{

    painter->save();

    // Folder items use the default delegate rendering unchanged

    if (index.data(Qt::UserRole).toBool()) {

        painter->restore();

        QStyledItemDelegate::paint(painter, option, index);

        return;

    }

    // Draw selection / hover background

    QStyle *style = option.widget ? option.widget->style() : QApplication::style();

    QStyleOptionViewItem bgOption = option;

    bgOption.showDecorationSelected = true;

    style->drawPrimitive(QStyle::PE_PanelItemViewItem, &bgOption, painter, option.widget);

    const QRect cellRect = option.rect;

    // Fixed icon zone: top IconZoneHeight pixels of the cell

    const QRect iconZone(cellRect.left(), cellRect.top(),

                         cellRect.width(), IconZoneHeight);

    // Fixed text zone: everything below the icon zone

    const QRect textZone(cellRect.left(), cellRect.top() + IconZoneHeight,

                         cellRect.width(), cellRect.height() - IconZoneHeight);

    // --- Draw icon centered within the icon zone ---

    const QVariant decorData = index.data(Qt::DecorationRole);

    QPixmap pixmap;

    if (decorData.userType() == QMetaType::QPixmap) {

        pixmap = qvariant_cast<QPixmap>(decorData);

    } else if (decorData.userType() == QMetaType::QIcon) {

        pixmap = qvariant_cast<QIcon>(decorData).pixmap(option.decorationSize);

    }

    if (!pixmap.isNull()) {

        // Center the pixmap in the icon zone

        const int x = iconZone.left() + (iconZone.width()  - pixmap.width())  / 2;

        const int y = iconZone.top()  + (iconZone.height() - pixmap.height()) / 2;

        painter->drawPixmap(x, y, pixmap);

    }

    // --- Draw text top-aligned within the text zone ---

    const QString text = index.data(Qt::DisplayRole).toString();

    if (!text.isEmpty()) {

        QColor textColor = option.palette.color(

            (option.state & QStyle::State_Selected) ? QPalette::HighlightedText

                                                    : QPalette::Text);

        painter->setPen(textColor);

        painter->setFont(option.font);

        QTextOption textOpt;

        textOpt.setAlignment(Qt::AlignTop | Qt::AlignHCenter);

        textOpt.setWrapMode(QTextOption::WordWrap);

        // Elide text that would overflow the text zone

        const QFontMetrics fm(option.font);

        const QString elidedText = fm.elidedText(

            text, option.textElideMode, textZone.width() * 2);

        painter->drawText(QRectF(textZone), elidedText, textOpt);

    }

    painter->restore();

}

QSize ThumbnailDelegate::sizeHint(const QStyleOptionViewItem &option,

                                  const QModelIndex &index) const

{

    Q_UNUSED(option)

    Q_UNUSED(index)

    // Return the grid size set on the view (148×168)

    return option.rect.size().isValid() ? option.rect.size()

                                        : QStyledItemDelegate::sizeHint(option, index);

}