Masterarbeit Richard Stern. Flutter App, sich mit einem Bluetooth-Gerät verbindet und Berührungen auf einem Sensor visualisiert.
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build.html 7.1KB

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  33. <h5>TouchDemonstrator class</h5>
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  59. <div class="col-xs-12 col-sm-9 col-md-8 main-content">
  60. <h1>build method</h1>
  61. <section class="multi-line-signature">
  62. <div>
  63. <ol class="annotation-list">
  64. <li>@override</li>
  65. </ol>
  66. </div>
  67. <span class="returntype">Widget</span>
  68. <span class="name ">build</span>
  69. (<wbr><span class="parameter" id="build-param-context"><span class="type-annotation">BuildContext</span> <span class="parameter-name">context</span></span>)
  70. </section>
  71. <section class="desc markdown">
  72. <p>Describes the part of the user interface represented by this widget.</p>
  73. <p>The framework calls this method when this widget is inserted into the
  74. tree in a given <code>BuildContext</code> and when the dependencies of this widget
  75. change (e.g., an <code>InheritedWidget</code> referenced by this widget changes).</p>
  76. <p>The framework replaces the subtree below this widget with the widget
  77. returned by this method, either by updating the existing subtree or by
  78. removing the subtree and inflating a new subtree, depending on whether the
  79. widget returned by this method can update the root of the existing
  80. subtree, as determined by calling <code>Widget.canUpdate</code>.</p>
  81. <p>Typically implementations return a newly created constellation of widgets
  82. that are configured with information from this widget's constructor and
  83. from the given <code>BuildContext</code>.</p>
  84. <p>The given <code>BuildContext</code> contains information about the location in the
  85. tree at which this widget is being built. For example, the context
  86. provides the set of inherited widgets for this location in the tree. A
  87. given widget might be built with multiple different <code>BuildContext</code>
  88. arguments over time if the widget is moved around the tree or if the
  89. widget is inserted into the tree in multiple places at once.</p>
  90. <p>The implementation of this method must only depend on:</p><ul><li>the fields of the widget, which themselves must not change over time,
  91. and</li><li>any ambient state obtained from the <code>context</code> using
  92. <code>BuildContext.inheritFromWidgetOfExactType</code>.</li></ul>
  93. <p>If a widget's <a href="main/TouchDemonstrator/build.html">build</a> method is to depend on anything else, use a
  94. <code>StatefulWidget</code> instead.</p>
  95. <p>See also:</p><ul><li>The discussion on performance considerations at <code>StatelessWidget</code>.</li></ul>
  96. </section>
  97. <section class="summary source-code" id="source">
  98. <h2><span>Implementation</span> </h2>
  99. <pre class="language-dart"><code class="language-dart">@override
  100. Widget build(BuildContext context) {
  101. return BlocProvider(
  102. bloc: bloc,
  103. child: new MaterialApp(
  104. title: &#39;Flutter 2&#39;,
  105. theme: new ThemeData(
  106. primaryColor: Color.fromRGBO(163, 31, 37, 1.0), &#47;&#47;PolyIC red
  107. accentColor: Color.fromRGBO(163, 31, 37, 0.8), &#47;&#47;PolyIC red, 80% brightness
  108. ),
  109. home: PageTouchPoints(),
  110. ),
  111. );
  112. }</code></pre>
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