n> abstract method 
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<span class="returntype">(<span class="field">{<span class="type-annotation"><a href="https://api.flutter.dev/flutter/widgets/Widget-class.html">Widget</a></span> <span class="field-name">child</span>, </span><span class="field"><span class="type-annotation">(<span class="field">{<span class="type-annotation"><a href="https://api.flutter.dev/flutter/widgets/Icon-class.html">Icon</a></span> <span class="field-name">activeIcon