Method setFileDropCallback

choc/gui/choc_DesktopWindow.h:459–473

    }

    void setFileDropCallback (FileDropCallback handler)
    {
        CHOC_AUTORELEASE_BEGIN

        if (handler)
        {
            fileDropCallback = std::move (handler);
            auto types = objc::callClass<id> ("NSArray", "arrayWithObject:", objc::getNSString ("NSFilenamesPboardType"));
            objc::call<void> (window, "registerForDraggedTypes:", types);
        }
        else
        {
            fileDropCallback = {};
            objc::call<void> (window, "unregisterDraggedTypes");
        }

        CHOC_AUTORELEASE_END
    }