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  58. <div class="col-xs-12 col-sm-9 col-md-8 main-content">
  59. <h1>key property</h1>
  60. <section class="multi-line-signature">
  61. <span class="returntype">Key</span>
  62. <span class="name ">key</span>
  63. <div class="features">final, inherited</div>
  64. </section>
  65. <section class="desc markdown">
  66. <p>Controls how one widget replaces another widget in the tree.</p>
  67. <p>If the <code>runtimeType</code> and <code>key</code> properties of the two widgets are
  68. <code>operator==</code>, respectively, then the new widget replaces the old widget by
  69. updating the underlying element (i.e., by calling <code>Element.update</code> with the
  70. new widget). Otherwise, the old element is removed from the tree, the new
  71. widget is inflated into an element, and the new element is inserted into the
  72. tree.</p>
  73. <p>In addition, using a <code>GlobalKey</code> as the widget's <code>key</code> allows the element
  74. to be moved around the tree (changing parent) without losing state. When a
  75. new widget is found (its key and type do not match a previous widget in
  76. the same location), but there was a widget with that same global key
  77. elsewhere in the tree in the previous frame, then that widget's element is
  78. moved to the new location.</p>
  79. <p>Generally, a widget that is the only child of another widget does not need
  80. an explicit key.</p>
  81. <p>See also the discussions at <code>Key</code> and <code>GlobalKey</code>.</p>
  82. </section>
  83. <section class="summary source-code" id="source">
  84. <h2><span>Implementation</span> </h2>
  85. <pre class="language-dart"><code class="language-dart">final Key key
  86. </code></pre>
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