="dart-ui/VoidCallback.html">VoidCallback</a></span><span class="signature">(<wbr>)
            <span class="returntype parameter">&#8594; void</span>
          </span>
                  </dt>
        <dd>
          Signature of callbacks that have no arguments and return no data.
                  
</dd>
      </dl>
    </section>


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    <h5>dart:ui library</h5>
    <ol>
  