Masterarbeit Richard Stern. Flutter App, sich mit einem Bluetooth-Gerät verbindet und Berührungen auf einem Sensor visualisiert.
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key.html 6.2KB

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  7. <meta name="description" content="API docs for the key property from the FingerPrintRow class, for the Dart programming language.">
  8. <title>key property - FingerPrintRow class - FingerPrintRow library - Dart API</title>
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  24. <li class="self-crumb">key property</li>
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  26. <div class="self-name">key</div>
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  33. <h5>FingerPrintRow class</h5>
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  35. <li class="section-title"><a href="ui_home_FingerPrintRow/FingerPrintRow-class.html#constructors">Constructors</a></li>
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  38. <a href="ui_home_FingerPrintRow/FingerPrintRow-class.html#instance-properties">Properties</a>
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  60. <h1>key property</h1>
  61. <section class="multi-line-signature">
  62. <span class="returntype">Key</span>
  63. <span class="name ">key</span>
  64. <div class="features">final, inherited</div>
  65. </section>
  66. <section class="desc markdown">
  67. <p>Controls how one widget replaces another widget in the tree.</p>
  68. <p>If the <code>runtimeType</code> and <code>key</code> properties of the two widgets are
  69. <code>operator==</code>, respectively, then the new widget replaces the old widget by
  70. updating the underlying element (i.e., by calling <code>Element.update</code> with the
  71. new widget). Otherwise, the old element is removed from the tree, the new
  72. widget is inflated into an element, and the new element is inserted into the
  73. tree.</p>
  74. <p>In addition, using a <code>GlobalKey</code> as the widget's <code>key</code> allows the element
  75. to be moved around the tree (changing parent) without losing state. When a
  76. new widget is found (its key and type do not match a previous widget in
  77. the same location), but there was a widget with that same global key
  78. elsewhere in the tree in the previous frame, then that widget's element is
  79. moved to the new location.</p>
  80. <p>Generally, a widget that is the only child of another widget does not need
  81. an explicit key.</p>
  82. <p>See also the discussions at <code>Key</code> and <code>GlobalKey</code>.</p>
  83. </section>
  84. <section class="summary source-code" id="source">
  85. <h2><span>Implementation</span> </h2>
  86. <pre class="language-dart"><code class="language-dart">final Key key
  87. </code></pre>
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