pan class="name ">onTextScaleFactorChanged</span>
          
</section>
        
                <section class="desc markdown">
          <p>A callback that is invoked whenever <a href="dart-ui/Window/textScaleFactor.html">textScaleFactor</a> changes value.</p>
<p>The framework invokes this callback in the same zone in which the
callback was set.</p>
<p>See also:</p>
<ul>
<li><code>WidgetsBindingObserver</code>, for a mechanism at the widgets layer to
observe when this callback is invoked.</li>
</ul>
     