qt-everywhere-src-5.15.1/qtmacextras/examples/macextras/macpasteboardmime/main.cpp

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#include <QApplication>
#include <QDebug>
#include <QDragEnterEvent>
#include <QDropEvent>
#include <QWidget>

#include <qmacpasteboardmime.h>

class VCardMime : public QMacPasteboardMime
{
public:
    VCardMime() : QMacPasteboardMime(MIME_ALL)
    { }

    QString convertorName()
    {
        return QString("VCardMime");
    }

    bool canConvert(const QString &mime, QString flav)
    {
        return mimeFor(flav) == mime;
    }

    QString mimeFor(QString flav)
    {
        if (flav == QString("public.vcard"))
            return QString("application/x-mycompany-VCard");
        return QString();
    }

    QString flavorFor(const QString &mime)
    {
        if (mime == QString("application/x-mycompany-VCard"))
            return QString("public.vcard");
        return QString();
    }

    QVariant convertToMime(const QString &mime, QList<QByteArray> data, QString flav)
    {
        Q_UNUSED(mime);
        Q_UNUSED(flav);

        return QVariant(data.join());
    }

    QList<QByteArray> convertFromMime(const QString &mime, QVariant data, QString flav)
    {
        Q_UNUSED(mime);
        Q_UNUSED(data);
        Q_UNUSED(flav);
        // Todo: implement!
        return QList<QByteArray>();
    }

};

class TestWidget : public QWidget
{
public:
    TestWidget() : QWidget(0)
    {
        vcardMime = new VCardMime();
        setAcceptDrops(true);
    }

    ~TestWidget()
    {
        delete vcardMime;
    }

    void dragEnterEvent(QDragEnterEvent *e)
    {
        e->accept();

    }

    virtual void dropEvent(QDropEvent *e)
    {
        e->accept();
        contentsDropEvent(e);
    }

    void contentsDropEvent(QDropEvent* e)
    {
        if ( e->mimeData()->hasFormat( "application/x-mycompany-VCard" ) )
        {
            QString s = QString( e->mimeData()->data( "application/x-mycompany-VCard" ) );

            // s now contains text of vcard
            qDebug() << "got vcard" << s.count();

            e->acceptProposedAction();
        }
    }
private:
    VCardMime *vcardMime;
};

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    qRegisterDraggedTypes(QStringList() << QLatin1String("public.vcard"));

    TestWidget wid1;
    wid1.show();

    return app.exec();
}