C++ QMimeType::isValid方法代码示例

const QString& vfile::vfile_getMime()
{
    if (vfile_mimeType.isEmpty()) {
        if(vfile_isdir)
            vfile_mimeType = "inode/directory";
        else if(vfile_isBrokenLink())
            vfile_mimeType = "unknown";
        else {
            QMimeDatabase db;
            QMimeType mt = db.mimeTypeForUrl(vfile_getUrl());
            vfile_mimeType = mt.isValid() ? mt.name() : "unknown";
            if (mt.isValid())
                vfile_icon = mt.iconName();
            if (vfile_mimeType == "inode/directory") {
                vfile_perm[0] = 'd';
                vfile_isdir = true;
            }
        }

        if (vfile_isdir && vfile_userDefinedFolderIcons) {
            QUrl url = vfile_getUrl();
            if (url.isLocalFile()) {
                QString file = url.toLocalFile() + "/.directory";
                KDesktopFile cfg(file);
                QString icon = cfg.readIcon();
                if(icon.startsWith(QLatin1String("./"))) // relative path
                    icon = url.toLocalFile() + '/' + icon;
                if (!icon.isEmpty())
                    vfile_icon = icon;
            }
        }
    }
    return vfile_mimeType;
}

QMimeType QMimeDatabasePrivate::mimeTypeForFileNameAndData(const QString &fileName, QIODevice *device, int *accuracyPtr)
{
    // First, glob patterns are evaluated. If there is a match with max weight,
    // this one is selected and we are done. Otherwise, the file contents are
    // evaluated and the match with the highest value (either a magic priority or
    // a glob pattern weight) is selected. Matching starts from max level (most
    // specific) in both cases, even when there is already a suffix matching candidate.
    *accuracyPtr = 0;

    // Pass 1) Try to match on the file name
    QStringList candidatesByName = mimeTypeForFileName(fileName);
    if (candidatesByName.count() == 1) {
        *accuracyPtr = 100;
        const QMimeType mime = mimeTypeForName(candidatesByName.at(0));
        if (mime.isValid())
            return mime;
        candidatesByName.clear();
    }

    // Extension is unknown, or matches multiple mimetypes.
    // Pass 2) Match on content, if we can read the data
    if (device->isOpen()) {

        // Read 16K in one go (QIODEVICE_BUFFERSIZE in qiodevice_p.h).
        // This is much faster than seeking back and forth into QIODevice.
        const QByteArray data = device->peek(16384);

        int magicAccuracy = 0;
        QMimeType candidateByData(findByData(data, &magicAccuracy));

        // Disambiguate conflicting extensions (if magic matching found something)
        if (candidateByData.isValid() && magicAccuracy > 0) {
            // "for glob_match in glob_matches:"
            // "if glob_match is subclass or equal to sniffed_type, use glob_match"
            const QString sniffedMime = candidateByData.name();
            foreach (const QString &m, candidatesByName) {
                if (inherits(m, sniffedMime)) {
                    // We have magic + pattern pointing to this, so it's a pretty good match
                    *accuracyPtr = 100;
                    return mimeTypeForName(m);
                }
            }
            *accuracyPtr = magicAccuracy;
            return candidateByData;
        }
    }

    if (candidatesByName.count() > 1) {
        *accuracyPtr = 20;
        candidatesByName.sort(); // to make it deterministic
        const QMimeType mime = mimeTypeForName(candidatesByName.at(0));
        if (mime.isValid())
            return mime;
    }

    return mimeTypeForName(defaultMimeType());
}

void tst_QMimeDatabase::mimeTypeForName()
{
    QMimeDatabase db;
    QMimeType s0 = db.mimeTypeForName(QString::fromLatin1("application/x-zerosize"));
    QVERIFY(s0.isValid());
    QCOMPARE(s0.name(), QString::fromLatin1("application/x-zerosize"));
    QCOMPARE(s0.comment(), QString::fromLatin1("empty document"));

    QMimeType s0Again = db.mimeTypeForName(QString::fromLatin1("application/x-zerosize"));
    QCOMPARE(s0Again.name(), s0.name());

    QMimeType s1 = db.mimeTypeForName(QString::fromLatin1("text/plain"));
    QVERIFY(s1.isValid());
    QCOMPARE(s1.name(), QString::fromLatin1("text/plain"));
    //qDebug("Comment is %s", qPrintable(s1.comment()));

    QMimeType krita = db.mimeTypeForName(QString::fromLatin1("application/x-krita"));
    QVERIFY(krita.isValid());

    // Test <comment> parsing with application/rdf+xml which has the english comment after the other ones
    QMimeType rdf = db.mimeTypeForName(QString::fromLatin1("application/rdf+xml"));
    QVERIFY(rdf.isValid());
    QCOMPARE(rdf.comment(), QString::fromLatin1("RDF file"));

    QMimeType bzip2 = db.mimeTypeForName(QString::fromLatin1("application/x-bzip2"));
    QVERIFY(bzip2.isValid());
    QCOMPARE(bzip2.comment(), QString::fromLatin1("Bzip archive"));

    QMimeType defaultMime = db.mimeTypeForName(QString::fromLatin1("application/octet-stream"));
    QVERIFY(defaultMime.isValid());
    QVERIFY(defaultMime.isDefault());

    QMimeType doesNotExist = db.mimeTypeForName(QString::fromLatin1("foobar/x-doesnot-exist"));
    QVERIFY(!doesNotExist.isValid());

    // TODO move to findByFile
#ifdef Q_OS_LINUX
    QString exePath = QStandardPaths::findExecutable(QLatin1String("ls"));
    if (exePath.isEmpty())
        qWarning() << "ls not found";
    else {
        const QString executableType = QString::fromLatin1("application/x-executable");
        //QTest::newRow("executable") << exePath << executableType;
        QCOMPARE(db.mimeTypeForFile(exePath).name(), executableType);
    }
#endif

}

EditWithMenu::EditWithMenu(const QUrl& url, QWidget* parent)
    : QObject(parent)
    , m_menu(0)
    , m_url(url)
{
    QMimeDatabase db;
    QMimeType type = db.mimeTypeForFile(url.path(), QMimeDatabase::MatchExtension);
    if ( !type.isValid() )
    {
        qCDebug(log_cervisia) << "Couldn't find mime type!";
        return;
    }

    m_offers = KMimeTypeTrader::self()->query(type.name());

    if( !m_offers.isEmpty() )
    {
        m_menu = new QMenu(i18n("Edit With"));

        KService::List::ConstIterator it = m_offers.constBegin();
        for( int i = 0 ; it != m_offers.constEnd(); ++it, ++i )
        {
            QAction* pAction = m_menu->addAction(QIcon::fromTheme((*it)->icon()), (*it)->name());
            pAction->setData(i);
        }

        connect(m_menu, SIGNAL(triggered(QAction*)),
                this, SLOT(actionTriggered(QAction*)));
    }

QVariant MessageComposer::data(const QModelIndex &index, int role) const
{
    if (!index.isValid() || index.column() != 0 || index.row() < 0 || index.row() >= m_attachments.size())
        return QVariant();

    switch (role) {
    case Qt::DisplayRole:
        return m_attachments[index.row()]->caption();
    case Qt::ToolTipRole:
        return m_attachments[index.row()]->tooltip();
    case Qt::DecorationRole:
    {
        // This is more or less copy-pasted from Gui/AttachmentView.cpp. Unfortunately, sharing the implementation
        // is not trivial due to the way how the static libraries are currently built.
        QMimeType mimeType = QMimeDatabase().mimeTypeForName(QString::fromUtf8(m_attachments[index.row()]->mimeType()));
        if (mimeType.isValid() && !mimeType.isDefault()) {
            return QIcon::fromTheme(mimeType.iconName(), UiUtils::loadIcon(QStringLiteral("mail-attachment")));
        } else {
            return UiUtils::loadIcon(QStringLiteral("mail-attachment"));
        }
    }
    case Imap::Mailbox::RoleAttachmentContentDispositionMode:
        return static_cast<int>(m_attachments[index.row()]->contentDispositionMode());
    }
    return QVariant();
}

bool MimeTypeChecker::isWantedCollection(const Collection &collection, const QString &wantedMimeType)
{
    if (wantedMimeType.isEmpty() || !collection.isValid()) {
        return false;
    }

    const QStringList contentMimeTypes = collection.contentMimeTypes();
    if (contentMimeTypes.isEmpty()) {
        return false;
    }

    foreach (const QString &mimeType, contentMimeTypes) {
        if (mimeType.isEmpty()) {
            continue;
        }

        if (mimeType == wantedMimeType) {
            return true;
        }

        QMimeDatabase db;
        const QMimeType mt = db.mimeTypeForName(mimeType);
        if (!mt.isValid()) {
            continue;
        }

        if (mt.inherits(wantedMimeType)) {
            return true;
        }
    }

    return false;
}

void tst_QMimeDatabase::inheritsPerformance()
{
    // Check performance of inherits().
    // This benchmark (which started in 2009 in kmimetypetest.cpp) uses 40 mimetypes.
    QStringList mimeTypes;
    mimeTypes << QLatin1String("image/jpeg") << QLatin1String("image/png") << QLatin1String("image/tiff") << QLatin1String("text/plain") << QLatin1String("text/html");
    mimeTypes += mimeTypes;
    mimeTypes += mimeTypes;
    mimeTypes += mimeTypes;
    QCOMPARE(mimeTypes.count(), 40);
    QMimeDatabase db;
    QMimeType mime = db.mimeTypeForName(QString::fromLatin1("text/x-chdr"));
    QVERIFY(mime.isValid());
    QBENCHMARK {
        QString match;
        foreach (const QString &mt, mimeTypes) {
            if (mime.inherits(mt)) {
                match = mt;
                // of course there would normally be a "break" here, but we're testing worse-case
                // performance here
            }
        }
        QCOMPARE(match, QString::fromLatin1("text/plain"));
    }
    // Numbers from 2011, in release mode:
    // KDE 4.7 numbers: 0.21 msec / 494,000 ticks / 568,345 instr. loads per iteration
    // QMimeBinaryProvider (with Qt 5): 0.16 msec / NA / 416,049 instr. reads per iteration
    // QMimeXmlProvider (with Qt 5): 0.062 msec / NA / 172,889 instr. reads per iteration
    //   (but the startup time is way higher)
    // And memory usage is flat at 200K with QMimeBinaryProvider, while it peaks at 6 MB when
    // parsing XML, and then keeps being around 4.5 MB for all the in-memory hashes.
}

Vector<String> MIMETypeRegistry::getExtensionsForMIMEType(const String& mimeTypeName)
{
    Vector<String> extensions;
    QMimeType mimeType = QMimeDatabase().mimeTypeForName(mimeTypeName);
    if (mimeType.isValid() && !mimeType.isDefault()) {
        Q_FOREACH(const QString& suffix, mimeType.suffixes()) {
            extensions.append(suffix);
        }
    }

static QMimeType mimeType(const QString &name, const QString& fallback)
{
    QMimeDatabase mime;
    QMimeType type;
    if ( !name.isEmpty() )
        type = mime.mimeTypeForName(name);
    if ( !type.isValid() && fallback != name )
        type = mime.mimeTypeForName(fallback);
    return type;
}

static QByteArray chooseFormatAndUrl(const QUrl &u, const QMimeData *mimeData,
                                     const QStringList &formats,
                                     const QString &text,
                                     const QString &suggestedFileName,
                                     QWidget *widget,
                                     bool clipboard,
                                     QUrl *newUrl)
{
    QMimeDatabase db;
    QStringList formatLabels;
    for (int i = 0; i < formats.size(); ++i) {
        const QString &fmt = formats[i];
        QMimeType mime = db.mimeTypeForName(fmt);
        if (mime.isValid()) {
            formatLabels.append(i18n("%1 (%2)", mime.comment(), fmt));
        } else {
            formatLabels.append(fmt);
        }
    }

    QString dialogText(text);
    if (dialogText.isEmpty()) {
        dialogText = i18n("Filename for clipboard content:");
    }
    //using QString() instead of QString::null didn't compile (with gcc 3.2.3), because the ctor was mistaken as a function declaration, Alex //krazy:exclude=nullstrassign
    KIO::PasteDialog dlg(QString::null, dialogText, suggestedFileName, formatLabels, widget, clipboard);   //krazy:exclude=nullstrassign

    if (dlg.exec() != QDialog::Accepted) {
        return QByteArray();
    }

    if (clipboard && dlg.clipboardChanged()) {
        KMessageBox::sorry(widget,
                           i18n("The clipboard has changed since you used 'paste': "
                                "the chosen data format is no longer applicable. "
                                "Please copy again what you wanted to paste."));
        return QByteArray();
    }

    const QString result = dlg.lineEditText();
    const QString chosenFormat = formats[ dlg.comboItem() ];

    //qDebug() << " result=" << result << " chosenFormat=" << chosenFormat;
    *newUrl = u;
    newUrl->setPath(newUrl->path() + '/' + result);
    // In Qt3, the result of clipboard()->mimeData() only existed until the next
    // event loop run (see dlg.exec() above), so we re-fetched it.
    // TODO: This should not be necessary with Qt5; remove this conditional
    // and test that it still works.
    if (clipboard) {
        mimeData = QApplication::clipboard()->mimeData();
    }
    const QByteArray ba = mimeData->data(chosenFormat);
    return ba;
}

KoDocumentInfoDlg::KoDocumentInfoDlg(QWidget* parent, KoDocumentInfo* docInfo)
    : KPageDialog(parent)
    , d(new KoDocumentInfoDlgPrivate)
{
    d->info = docInfo;

    setWindowTitle(i18n("Document Information"));
//    setInitialSize(QSize(500, 500));
    setFaceType(KPageDialog::List);
    setStandardButtons(QDialogButtonBox::Ok | QDialogButtonBox::Cancel);
    button(QDialogButtonBox::Ok)->setDefault(true);

    d->aboutUi = new Ui::KoDocumentInfoAboutWidget();
    QWidget *infodlg = new QWidget();
    d->aboutUi->setupUi(infodlg);
    d->aboutUi->cbLanguage->addItems(KoGlobal::listOfLanguages());
    d->aboutUi->cbLanguage->setCurrentIndex(-1);

    KPageWidgetItem *page = new KPageWidgetItem(infodlg, i18n("General"));
    page->setHeader(i18n("General"));

    // Ugly hack, the mimetype should be a parameter, instead
    KoDocumentBase* doc = dynamic_cast< KoDocumentBase* >(d->info->parent());
    if (doc) {
        QMimeDatabase db;
        QMimeType mime = db.mimeTypeForName(doc->mimeType());
        if (mime.isValid()) {
            page->setIcon(KisIconUtils::loadIcon(mime.iconName()));
        }
    } else {
        // hide all entries not used in pages for KoDocumentInfoPropsPage
        d->aboutUi->filePathInfoLabel->setVisible(false);
        d->aboutUi->filePathLabel->setVisible(false);
        d->aboutUi->filePathSeparatorLine->setVisible(false);
        d->aboutUi->lblTypeDesc->setVisible(false);
        d->aboutUi->lblType->setVisible(false);
    }
    addPage(page);
    d->pages.append(page);

    initAboutTab();

    d->authorUi = new Ui::KoDocumentInfoAuthorWidget();
    QWidget *authordlg = new QWidget();
    d->authorUi->setupUi(authordlg);
    page = new KPageWidgetItem(authordlg, i18n("Author"));
    page->setHeader(i18n("Last saved by"));
    page->setIcon(koIcon("user-identity"));
    addPage(page);
    d->pages.append(page);

    initAuthorTab();
}

KIso::KIso(const QString& filename, const QString & _mimetype)
        : KArchive(0L)
{
    KISOFUNC;
    KISODEBUG("Starting KIso: " << filename << " - type: " << _mimetype);

    m_startsec = -1;
    m_filename = filename;
    d = new KIsoPrivate;
    QString mimetype(_mimetype);
    bool forced = true;
    if (mimetype.isEmpty()) {
        QMimeDatabase db;
        QMimeType mt = db.mimeTypeForFile(filename, QMimeDatabase::MatchContent);
        if (mt.isValid())
            mimetype = mt.name();

        //qDebug() << "KIso::KIso mimetype=" << mimetype << endl;

        // Don't move to prepareDevice - the other constructor theoretically allows ANY filter
        if (mimetype == "application/x-tgz" || mimetype == "application/x-targz" ||  // the latter is deprecated but might still be around
                mimetype == "application/x-webarchive")
            // that's a gzipped tar file, so ask for gzip filter
            mimetype = "application/x-gzip";
        else if (mimetype == "application/x-tbz")   // that's a bzipped2 tar file, so ask for bz2 filter
            mimetype = "application/x-bzip2";
        else {
            // Something else. Check if it's not really gzip though (e.g. for KOffice docs)
            QFile file(filename);
            if (file.open(QIODevice::ReadOnly)) {
                char firstByte;
                char secondByte;
                char thirdByte;
                file.getChar(&firstByte);
                file.getChar(&secondByte);
                file.getChar(&thirdByte);
                if (firstByte == 0037 && secondByte == (char)0213)
                    mimetype = "application/x-gzip";
                else if (firstByte == 'B' && secondByte == 'Z' && thirdByte == 'h')
                    mimetype = "application/x-bzip2";
                else if (firstByte == 'P' && secondByte == 'K' && thirdByte == 3) {
                    char fourthByte;
                    file.getChar(&fourthByte);
                    if (fourthByte == 4)
                        mimetype = "application/x-zip";
                }
            }
        }
        forced = false;
    }

    prepareDevice(filename, mimetype, forced);
}

QString vfile::vfile_getIcon()
{
    if (vfile_icon.isEmpty()) {
        QString mime = vfile_getMime();
        if (vfile_isBrokenLink())
            vfile_icon = "file-broken";
        else if (vfile_icon.isEmpty()) {
            QMimeDatabase db;
            QMimeType mt = db.mimeTypeForName(mime);
            vfile_icon = mt.isValid() ? mt.iconName() : "file-broken";
        }
    }
    return vfile_icon;
}

String MIMETypeRegistry::getMIMETypeForPath(const String& path)
{
    QMimeType type = QMimeDatabase().mimeTypeForFile(path, QMimeDatabase::MatchExtension);
    if (type.isValid() && !type.isDefault())
        return type.name();

    const ExtensionMap *e = extensionMap;
    while (e->extension) {
        if (path.endsWith(e->dotExtension))
            return e->mimeType;
        ++e;
    }

    return defaultMIMEType();
}

KisFilterChooser::KisFilterChooser(QWidget *parent, const QStringList &mimeTypes, const QString &/*nativeFormat*/, const QUrl &url)
        : KoDialog(parent),
        m_mimeTypes(mimeTypes)
{
    setObjectName("kofilterchooser");
    setInitialSize(QSize(300, 350));
    setButtons(KoDialog::Ok|KoDialog::Cancel);
    setDefaultButton(KoDialog::Ok);
    setCaption(i18n("Choose Filter"));
    setModal(true);

    QWidget *page = new QWidget(this);
    setMainWidget(page);

    QVBoxLayout *layout = new QVBoxLayout(page);
    if (url.isValid()) {
        KSqueezedTextLabel *l = new KSqueezedTextLabel(url.path(), page);
        layout->addWidget(l);
    }
    m_filterList = new QListWidget(page);
    layout->addWidget(m_filterList);
    page->setLayout(layout);

    Q_ASSERT(!m_mimeTypes.isEmpty());
    for (QStringList::ConstIterator it = m_mimeTypes.constBegin();
            it != m_mimeTypes.constEnd();
            ++it) {

        QMimeDatabase db;
        QMimeType mime = db.mimeTypeForName(*it);
        const QString name = mime.isValid() ? mime.comment() : *it;
        if (! name.isEmpty()) {
            QListWidgetItem *item = new QListWidgetItem(name, m_filterList);
            item->setData(32, *it);
        }
    }

    m_filterList->sortItems();

    if (m_filterList->currentRow() == -1)
        m_filterList->setCurrentRow(0);

    m_filterList->setFocus();

    connect(m_filterList, SIGNAL(itemDoubleClicked(QListWidgetItem*)), this, SLOT(accept()));
    resize(QSize(520, 400));//.expandedTo(minimumSizeHint()));
}