129 lines
5.8 KiB
HTML
129 lines
5.8 KiB
HTML
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1">
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<meta name="description" content="API docs for the key property from the Logo class, for the Dart programming language.">
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<title>key property - Logo class - uiComponents library - Dart API</title>
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<!-- required because all the links are pseudo-absolute -->
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<base href="../..">
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<link href="https://fonts.googleapis.com/css?family=Source+Code+Pro:500,400i,400,300|Source+Sans+Pro:400,300,700" rel="stylesheet">
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<link rel="stylesheet" href="static-assets/github.css">
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<link rel="stylesheet" href="static-assets/styles.css">
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<link rel="icon" href="static-assets/favicon.png">
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</head>
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<body>
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<div id="overlay-under-drawer"></div>
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<header id="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="ui_home_uiComponents/ui_home_uiComponents-library.html">uiComponents</a></li>
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<li><a href="ui_home_uiComponents/Logo-class.html">Logo</a></li>
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<li class="self-crumb">key property</li>
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</ol>
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<div class="self-name">key</div>
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<form class="search navbar-right" role="search">
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<input type="text" id="search-box" autocomplete="off" disabled class="form-control typeahead" placeholder="Loading search...">
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</form>
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</header>
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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>Logo class</h5>
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<ol>
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<li class="section-title"><a href="ui_home_uiComponents/Logo-class.html#constructors">Constructors</a></li>
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<li><a href="ui_home_uiComponents/Logo/Logo.html">Logo</a></li>
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<li class="section-title inherited">
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<a href="ui_home_uiComponents/Logo-class.html#instance-properties">Properties</a>
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</li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/hashCode.html">hashCode</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/key.html">key</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/runtimeType.html">runtimeType</a></li>
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<li class="section-title"><a href="ui_home_uiComponents/Logo-class.html#instance-methods">Methods</a></li>
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<li><a href="ui_home_uiComponents/Logo/build.html">build</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/createElement.html">createElement</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/debugDescribeChildren.html">debugDescribeChildren</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/debugFillProperties.html">debugFillProperties</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/noSuchMethod.html">noSuchMethod</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/toDiagnosticsNode.html">toDiagnosticsNode</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/toString.html">toString</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/toStringDeep.html">toStringDeep</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/toStringShallow.html">toStringShallow</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/toStringShort.html">toStringShort</a></li>
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<li class="section-title inherited"><a href="ui_home_uiComponents/Logo-class.html#operators">Operators</a></li>
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<li class="inherited"><a href="ui_home_uiComponents/Logo/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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<div class="col-xs-6 col-sm-6 col-md-2 sidebar sidebar-offcanvas-right">
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</div><!--/.sidebar-offcanvas-->
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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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</span>
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</footer>
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
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<script src="static-assets/typeahead.bundle.min.js"></script>
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<script src="static-assets/highlight.pack.js"></script>
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<script src="static-assets/URI.js"></script>
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<script src="static-assets/script.js"></script>
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</body>
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</html>
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