widgets.py 文件源码

def possiblyDeferWidget(widget, request):
    # web in my head get it out get it out
    try:
        disp = widget.display(request)
        # if this widget wants to defer anything -- well, I guess we've got to
        # defer it.
        for elem in disp:
            if isinstance(elem, defer.Deferred):
                req = _RequestDeferral()
                RenderSession(disp, req)
                return req.deferred
        return string.join(disp, '')
    except:
        io = StringIO()
        traceback.print_exc(file=io)
        return html.PRE(io.getvalue())