130 lines
5.8 KiB
HTML
Executable File
130 lines
5.8 KiB
HTML
Executable File
<!DOCTYPE html>
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<meta name="description" content="API docs for the key property from the TouchDemonstrator class, for the Dart programming language.">
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<title>key property - TouchDemonstrator class - main library - Dart API</title>
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<button id="sidenav-left-toggle" type="button"> </button>
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<ol class="breadcrumbs gt-separated dark hidden-xs">
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<li><a href="index.html">touch_demonstrator</a></li>
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<li><a href="main/main-library.html">main</a></li>
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<li><a href="main/TouchDemonstrator-class.html">TouchDemonstrator</a></li>
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<li class="self-crumb">key property</li>
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<div class="self-name">key</div>
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<main>
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<div class="col-xs-6 col-sm-3 col-md-2 sidebar sidebar-offcanvas-left">
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<h5>TouchDemonstrator class</h5>
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<ol>
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<li class="section-title"><a href="main/TouchDemonstrator-class.html#constructors">Constructors</a></li>
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<li><a href="main/TouchDemonstrator/TouchDemonstrator.html">TouchDemonstrator</a></li>
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<li class="section-title">
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<a href="main/TouchDemonstrator-class.html#instance-properties">Properties</a>
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</li>
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<li><a href="main/TouchDemonstrator/bloc.html">bloc</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/hashCode.html">hashCode</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/key.html">key</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/runtimeType.html">runtimeType</a></li>
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<li class="section-title"><a href="main/TouchDemonstrator-class.html#instance-methods">Methods</a></li>
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<li><a href="main/TouchDemonstrator/build.html">build</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/createElement.html">createElement</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/debugDescribeChildren.html">debugDescribeChildren</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/debugFillProperties.html">debugFillProperties</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/noSuchMethod.html">noSuchMethod</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/toDiagnosticsNode.html">toDiagnosticsNode</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/toString.html">toString</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/toStringDeep.html">toStringDeep</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/toStringShallow.html">toStringShallow</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/toStringShort.html">toStringShort</a></li>
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<li class="section-title inherited"><a href="main/TouchDemonstrator-class.html#operators">Operators</a></li>
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<li class="inherited"><a href="main/TouchDemonstrator/operator_equals.html">operator ==</a></li>
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</ol>
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</div><!--/.sidebar-offcanvas-->
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<div class="col-xs-12 col-sm-9 col-md-8 main-content">
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<h1>key property</h1>
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<section class="multi-line-signature">
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<span class="returntype">Key</span>
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<span class="name ">key</span>
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<div class="features">final, inherited</div>
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</section>
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<section class="desc markdown">
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<p>Controls how one widget replaces another widget in the tree.</p>
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<p>If the <code>runtimeType</code> and <code>key</code> properties of the two widgets are
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<code>operator==</code>, respectively, then the new widget replaces the old widget by
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updating the underlying element (i.e., by calling <code>Element.update</code> with the
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new widget). Otherwise, the old element is removed from the tree, the new
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widget is inflated into an element, and the new element is inserted into the
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tree.</p>
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<p>In addition, using a <code>GlobalKey</code> as the widget's <code>key</code> allows the element
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to be moved around the tree (changing parent) without losing state. When a
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new widget is found (its key and type do not match a previous widget in
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the same location), but there was a widget with that same global key
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elsewhere in the tree in the previous frame, then that widget's element is
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moved to the new location.</p>
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<p>Generally, a widget that is the only child of another widget does not need
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an explicit key.</p>
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<p>See also the discussions at <code>Key</code> and <code>GlobalKey</code>.</p>
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</section>
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<section class="summary source-code" id="source">
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<h2><span>Implementation</span> </h2>
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<pre class="language-dart"><code class="language-dart">final Key key
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</code></pre>
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</section>
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</div> <!-- /.main-content -->
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</main>
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<footer>
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<span class="no-break">
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touch_demonstrator 1.0.0+1
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