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    <h5>SideBarContentState class</h5>
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    <h1>dispose method</h1>

    <section class="multi-line-signature">
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        <ol class="annotation-list">
          <li>@protected</li>
          <li>@mustCallSuper</li>
        </ol>
      </div>
      <span class="returntype">void</span>
      <span class="name ">dispose</span>
(<wbr>)
      <div class="features">@mustCallSuper, @protected, inherited</div>
    </section>
    <section class="desc markdown">
      <p>Called when this object is removed from the tree permanently.</p>
<p>The framework calls this method when this <code>State</code> object will never
build again. After the framework calls <a href="pages_SideBarContent/SideBarContentState/dispose.html">dispose</a>, the <code>State</code> object is
considered unmounted and the <a href="pages_SideBarContent/SideBarContentState/mounted.html">mounted</a> property is false. It is an error
to call <a href="pages_SideBarContent/SideBarContentState/setState.html">setState</a> at this point. This stage of the lifecycle is terminal:
there is no way to remount a <code>State</code> object that has been disposed.</p>
<p>Subclasses should override this method to release any resources retained
by this object (e.g., stop any active animations).</p>
<p>If a <code>State</code>'s <a href="pages_SideBarContent/SideBarContentState/build.html">build</a> method depends on an object that can itself change
state, for example a <code>ChangeNotifier</code> or <code>Stream</code>, or some other object to
which one can subscribe to receive notifications, then the <code>State</code> should
subscribe to that object during <a href="pages_SideBarContent/SideBarContentState/initState.html">initState</a>, unsubscribe from the old
object and subscribe to the new object when it changes in
<a href="pages_SideBarContent/SideBarContentState/didUpdateWidget.html">didUpdateWidget</a>, and then unsubscribe from the object in <a href="pages_SideBarContent/SideBarContentState/dispose.html">dispose</a>.</p>
<p>If you override this, make sure to end your method with a call to
super.dispose().</p>
<p>See also <a href="pages_SideBarContent/SideBarContentState/deactivate.html">deactivate</a>, which is called prior to <a href="pages_SideBarContent/SideBarContentState/dispose.html">dispose</a>.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span> </h2>
      <pre class="language-dart"><code class="language-dart">@protected
@mustCallSuper
void dispose() {
  assert(_debugLifecycleState == _StateLifecycle.ready);
  assert(() { _debugLifecycleState = _StateLifecycle.defunct; return true; }());
}</code></pre>
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