C++ QMimeDatabase::allMimeTypes方法代码示例

DirModel::DirModel(QObject *parent)
    : KDirModel(parent),
      m_screenshotSize(180, 120)
{
#if 0 // unused here in trash
    QMimeDatabase db;
    QList<QMimeType> mimeList = db.allMimeTypes();

    m_mimeTypes << "inode/directory";
    foreach (const QMimeType &mime, mimeList) {
        if (mime.name().startsWith(QStringLiteral("image/"))) {
            m_mimeTypes << mime.name();
        }
    }

    //TODO: configurable mime filter
    //dirLister()->setMimeFilter(m_mimeTypes);
#endif

    m_previewTimer = new QTimer(this);
    m_previewTimer->setSingleShot(true);
    connect(m_previewTimer, &QTimer::timeout,
            this, &DirModel::delayedPreview);

    //using the same cache of the engine, they index both by url
    m_imageCache = new KImageCache(QStringLiteral("org.kde.dirmodel-qml"), 10485760);

    connect(this, &QAbstractItemModel::rowsInserted,
            this, &DirModel::countChanged);
    connect(this, &QAbstractItemModel::rowsRemoved,
            this, &DirModel::countChanged);
    connect(this, &QAbstractItemModel::modelReset,
            this, &DirModel::countChanged);
}

void MimetypeModel::populate()
{
    typedef QList<QMimeType>::Iterator Iterator;

    QMimeDatabase mimeDatabase;
    QList<QMimeType> allTypes = mimeDatabase.allMimeTypes();

    // Move top level types to rear end of list, sort this partition,
    // create top level items and truncate the list.
    Iterator end = allTypes.end();
    const Iterator topLevelStart =
        std::stable_partition(allTypes.begin(), end,
                              [](const QMimeType &t) { return !t.parentMimeTypes().isEmpty(); });
    std::stable_sort(topLevelStart, end);
    for (Iterator it = topLevelStart; it != end; ++it) {
        const StandardItemList row = createRow(*it);
        appendRow(row);
        m_nameIndexHash.insert(it->name(), indexFromItem(row.constFirst()));
    }
    allTypes.erase(topLevelStart, end);

    while (!allTypes.isEmpty()) {
        // Find a type inheriting one that is already in the model.
        end = allTypes.end();
        auto nameIndexIt = m_nameIndexHash.constEnd();
        for (Iterator it = allTypes.begin(); it != end; ++it) {
            nameIndexIt = m_nameIndexHash.constFind(it->parentMimeTypes().constFirst());
            if (nameIndexIt != m_nameIndexHash.constEnd())
                break;
        }
        if (nameIndexIt == m_nameIndexHash.constEnd()) {
            qWarning() << "Orphaned mime types:" << allTypes;
            break;
        }

        // Move types inheriting the parent type to rear end of list, sort this partition,
        // append the items to parent and truncate the list.
        const QString &parentName = nameIndexIt.key();
        const Iterator start =
            std::stable_partition(allTypes.begin(), end, [parentName](const QMimeType &t)
                                  { return !t.parentMimeTypes().contains(parentName); });
        std::stable_sort(start, end);
        QStandardItem *parentItem = itemFromIndex(nameIndexIt.value());
        for (Iterator it = start; it != end; ++it) {
            const StandardItemList row = createRow(*it);
            parentItem->appendRow(row);
            m_nameIndexHash.insert(it->name(), indexFromItem(row.constFirst()));
        }
        allTypes.erase(start, end);
    }
}

void MimetypeViewer::loadAllMimeTypes()
{
    mediaTypes.clear();
    mGroupItems.clear();
    mItemList.clear();
    QStringList selectedMimeTypes;

    QMimeDatabase db;
    QList<QMimeType> mimetypes = db.allMimeTypes();

    qSort(mimetypes.begin(), mimetypes.end(), mimeTypeLessThan);
    for (const QMimeType &mt : qAsConst(mimetypes)) {
        const QString mimetype = mt.name();
        const int i = mimetype.indexOf(QLatin1Char('/'));
        const QString mediaType = mimetype.left(i);
        const QString subType = mimetype.mid(i + 1);

        MimeTypeData* data = new MimeTypeData(mt);

        if (!mediaTypes.contains(mediaType)) { // A new type of media
            mediaTypes.append(mediaType);
            QTreeWidgetItem *item = new QTreeWidgetItem(widget.mimetypeTreeWidget, GroupType);
            item->setText(0, mediaType);
            widget.mimetypeTreeWidget->insertTopLevelItem(0, item);
            mGroupItems.insert(mediaType, item);
        }
        QTreeWidgetItem *item = new QTreeWidgetItem(mGroupItems.value(mediaType), EntrieType);
        QVariant v;
        v.setValue(*data);
        item->setData(0, Qt::UserRole, v);
        item->setText(0, subType);
        mItemList.append(item);
    }

    widget.mimetypeTreeWidget->resizeColumnToContents(1);
    widget.mimetypeTreeWidget->show();
}