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    <h5>NoAnimationMaterialPageRoute class</h5>
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  <div class="col-xs-12 col-sm-9 col-md-8 main-content">
    <h1>addScopedWillPopCallback method</h1>

    <section class="multi-line-signature">
      <span class="returntype">void</span>
      <span class="name ">addScopedWillPopCallback</span>
(<wbr><span class="parameter" id="addScopedWillPopCallback-param-callback"><span class="type-annotation">WillPopCallback</span> <span class="parameter-name">callback</span></span>)
      <div class="features">inherited</div>
    </section>
    <section class="desc markdown">
      <p>Enables this route to veto attempts by the user to dismiss it.</p>
<p>This callback is typically added using a <code>WillPopScope</code> widget. That
widget finds the enclosing <code>ModalRoute</code> and uses this function to register
this callback:</p>
<pre class="language-dart"><code class="language-dart">Widget build(BuildContext context) {
  return WillPopScope(
    onWillPop: askTheUserIfTheyAreSure,
    child: ...,
  );
}
</code></pre>
<p>This callback runs asynchronously and it's possible that it will be called
after its route has been disposed. The callback should check <code>State.mounted</code>
before doing anything.</p>
<p>A typical application of this callback would be to warn the user about
unsaved <code>Form</code> data if the user attempts to back out of the form. In that
case, use the <code>Form.onWillPop</code> property to register the callback.</p>
<p>To register a callback manually, look up the enclosing <code>ModalRoute</code> in a
<code>State.didChangeDependencies</code> callback:</p>
<pre class="language-dart"><code class="language-dart">ModalRoute&lt;dynamic&gt; _route;

@override
void didChangeDependencies() {
 super.didChangeDependencies();
 _route?.removeScopedWillPopCallback(askTheUserIfTheyAreSure);
 _route = ModalRoute.of(context);
 _route?.addScopedWillPopCallback(askTheUserIfTheyAreSure);
}
</code></pre>
<p>If you register a callback manually, be sure to remove the callback with
<a href="ui_noAnimationMaterialPageRoute/NoAnimationMaterialPageRoute/removeScopedWillPopCallback.html">removeScopedWillPopCallback</a> by the time the widget has been disposed. A
stateful widget can do this in its dispose method (continuing the previous
example):</p>
<pre class="language-dart"><code class="language-dart">@override
void dispose() {
  _route?.removeScopedWillPopCallback(askTheUserIfTheyAreSure);
  _route = null;
  super.dispose();
}
</code></pre>
<p>See also:</p><ul><li><code>WillPopScope</code>, which manages the registration and unregistration
process automatically.</li><li><code>Form</code>, which provides an <code>onWillPop</code> callback that uses this mechanism.</li><li><a href="ui_noAnimationMaterialPageRoute/NoAnimationMaterialPageRoute/willPop.html">willPop</a>, which runs the callbacks added with this method.</li><li><a href="ui_noAnimationMaterialPageRoute/NoAnimationMaterialPageRoute/removeScopedWillPopCallback.html">removeScopedWillPopCallback</a>, which removes a callback from the list
that <a href="ui_noAnimationMaterialPageRoute/NoAnimationMaterialPageRoute/willPop.html">willPop</a> checks.</li></ul>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span> </h2>
      <pre class="language-dart"><code class="language-dart">void addScopedWillPopCallback(WillPopCallback callback) {
  assert(_scopeKey.currentState != null, &#39;Tried to add a willPop callback to a route that is not currently in the tree.&#39;);
  _willPopCallbacks.add(callback);
}</code></pre>
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