blame: imagemodel.cpp

#include "imagemodel.h"

#include "thumbnailworker.h"

#include <QDir>

#include <QImageReader>

#include <QFileInfo>

ImageModel::ImageModel(QObject *parent)

    : QAbstractListModel(parent)

{

    m_threadPool.setMaxThreadCount(QThread::idealThreadCount());

    // Simple gray placeholder

    m_placeholder = QPixmap(128, 128);

    m_placeholder.fill(Qt::lightGray);

}

ImageModel::~ImageModel()

{

    m_threadPool.waitForDone();

}

void ImageModel::setDirectory(const QString &path)

{

    beginResetModel();

    m_items.clear();

    QDir dir(path);

    QStringList filters;

    const auto formats = QImageReader::supportedImageFormats();

    for (const QByteArray &fmt : formats)

        filters << "*." + fmt;

    dir.setNameFilters(filters);

    dir.setFilter(QDir::Files);

    const auto files = dir.entryInfoList();

    int row = 0;

    for (const QFileInfo &file : files)

    {

        m_items.append({file.absoluteFilePath(), m_placeholder, false});

        // Create worker

        auto *worker = new ThumbnailWorker(file.absoluteFilePath(), row);

        connect(worker, &ThumbnailWorker::finished,

                this, &ImageModel::thumbnailReady,

                Qt::QueuedConnection);

        m_threadPool.start(worker);

        row++;

    }

    endResetModel();

}

QString ImageModel::filePath(const QModelIndex &index) const

{

    if (!index.isValid())

        return {};

    return m_items[index.row()].path;

}

int ImageModel::rowCount(const QModelIndex &) const

{

    return m_items.size();

}

QVariant ImageModel::data(const QModelIndex &index, int role) const

{

    if (!index.isValid())

        return {};

    const Item &item = m_items[index.row()];

    if (role == Qt::DecorationRole)

        return item.thumbnail;

    if (role == Qt::DisplayRole)

        return QFileInfo(item.path).fileName();

    return {};

}

void ImageModel::thumbnailReady(int row, const QPixmap &pixmap)

{

    if (row < 0 || row >= m_items.size())

        return;

    m_items[row].thumbnail = pixmap;

    m_items[row].loaded = true;

    QModelIndex idx = index(row);

    emit dataChanged(idx, idx, {Qt::DecorationRole});

}