Method createMimeDataFromSelection

src/Gui/MainWindow.cpp:2341–2427

static QLatin1String _MimeDocObjXFile("application/x-documentobject-x-file");

QMimeData* MainWindow::createMimeDataFromSelection() const
{
    std::vector<App::DocumentObject*> sel;
    std::set<App::DocumentObject*> objSet;
    for (auto& s : Selection().getCompleteSelection()) {
        if (s.pObject && s.pObject->isAttachedToDocument() && objSet.insert(s.pObject).second) {
            sel.push_back(s.pObject);
        }
    }
    if (sel.empty()) {
        return nullptr;
    }

    auto all = App::Document::getDependencyList(sel);
    if (all.size() > sel.size()) {
        DlgObjectSelection dlg(sel, getMainWindow());
        if (dlg.exec() != QDialog::Accepted) {
            return nullptr;
        }
        sel = dlg.getSelections();
        if (sel.empty()) {
            return nullptr;
        }
    }

    std::vector<App::Document*> unsaved;
    bool hasXLink = App::PropertyXLink::hasXLink(sel, &unsaved);
    if (!unsaved.empty()) {
        QMessageBox::critical(
            getMainWindow(),
            tr("Unsaved document"),
            tr("The exported object contains external link. Save the document"
               "at least once before exporting.")
        );
        return nullptr;
    }

    unsigned int memsize = 1000;  // ~ for the meta-information
    for (const auto& it : sel) {
        memsize += it->getMemSize();
    }

    // if less than ~10 MB
    bool use_buffer = (memsize < 0xA00000);
    QByteArray res;
    std::string buffer;
    if (use_buffer) {
        try {
            buffer.reserve(memsize);
        }
        catch (const std::bad_alloc&) {
            use_buffer = false;
        }
    }

    WaitCursor wc;
    QString mime;
    if (use_buffer) {