QInputMethodEvent用法的任何示例吗？

void DeclarativeInputEngine::sendKeyToFocusItem(const QString& text)
{
    qDebug() << \"CDeclarativeInputEngine::sendKeyToFocusItem \" << text;
    QInputMethodEvent ev;
    if (text == QString(\"\\x7F\"))
    {
        //delete one char
        ev.setCommitString(\"\",-1,1);

    } else
    {
        //add some text
        ev.setCommitString(text);
    }
    QCoreApplication::sendEvent(QGuiApplication::focusObject(),&ev);
}