145 lines
7.1 KiB
HTML
145 lines
7.1 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 shouldRepaint method from the TouchPainter class, for the Dart programming language.">
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<title>shouldRepaint method - TouchPainter class - TouchPainter 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_TouchPainter/ui_home_TouchPainter-library.html">TouchPainter</a></li>
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<li><a href="ui_home_TouchPainter/TouchPainter-class.html">TouchPainter</a></li>
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<li class="self-crumb">shouldRepaint method</li>
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</ol>
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<div class="self-name">shouldRepaint</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>TouchPainter class</h5>
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<ol>
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<li class="section-title"><a href="ui_home_TouchPainter/TouchPainter-class.html#constructors">Constructors</a></li>
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<li><a href="ui_home_TouchPainter/TouchPainter/TouchPainter.html">TouchPainter</a></li>
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<li class="section-title">
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<a href="ui_home_TouchPainter/TouchPainter-class.html#instance-properties">Properties</a>
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</li>
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<li><a href="ui_home_TouchPainter/TouchPainter/context.html">context</a></li>
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<li><a href="ui_home_TouchPainter/TouchPainter/touchCollection.html">touchCollection</a></li>
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<li><a href="ui_home_TouchPainter/TouchPainter/width.html">width</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/hashCode.html">hashCode</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/runtimeType.html">runtimeType</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/semanticsBuilder.html">semanticsBuilder</a></li>
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<li class="section-title"><a href="ui_home_TouchPainter/TouchPainter-class.html#instance-methods">Methods</a></li>
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<li><a href="ui_home_TouchPainter/TouchPainter/paint.html">paint</a></li>
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<li><a href="ui_home_TouchPainter/TouchPainter/shouldRepaint.html">shouldRepaint</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/addListener.html">addListener</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/hitTest.html">hitTest</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/noSuchMethod.html">noSuchMethod</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/removeListener.html">removeListener</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/shouldRebuildSemantics.html">shouldRebuildSemantics</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/toString.html">toString</a></li>
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<li class="section-title inherited"><a href="ui_home_TouchPainter/TouchPainter-class.html#operators">Operators</a></li>
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<li class="inherited"><a href="ui_home_TouchPainter/TouchPainter/operator_equals.html">operator ==</a></li>
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<li class="section-title"><a href="ui_home_TouchPainter/TouchPainter-class.html#static-properties">Static properties</a></li>
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<li><a href="ui_home_TouchPainter/TouchPainter/buttonPressed.html">buttonPressed</a></li>
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<li><a href="ui_home_TouchPainter/TouchPainter/buttonReleased.html">buttonReleased</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>shouldRepaint method</h1>
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<section class="multi-line-signature">
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<div>
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<ol class="annotation-list">
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<li>@override</li>
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</ol>
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</div>
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<span class="returntype">bool</span>
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<span class="name ">shouldRepaint</span>
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(<wbr><span class="parameter" id="shouldRepaint-param-oldDelegate"><span>covariant</span> <span class="type-annotation">CustomPainter</span> <span class="parameter-name">oldDelegate</span></span>)
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</section>
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<section class="desc markdown">
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<p>Called whenever a new instance of the custom painter delegate class is
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provided to the <code>RenderCustomPaint</code> object, or any time that a new
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<code>CustomPaint</code> object is created with a new instance of the custom painter
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delegate class (which amounts to the same thing, because the latter is
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implemented in terms of the former).</p>
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<p>If the new instance represents different information than the old
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instance, then the method should return true, otherwise it should return
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false.</p>
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<p>If the method returns false, then the <a href="ui_home_TouchPainter/TouchPainter/paint.html">paint</a> call might be optimized
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away.</p>
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<p>It's possible that the <a href="ui_home_TouchPainter/TouchPainter/paint.html">paint</a> method will get called even if
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<a href="ui_home_TouchPainter/TouchPainter/shouldRepaint.html">shouldRepaint</a> returns false (e.g. if an ancestor or descendant needed to
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be repainted). It's also possible that the <a href="ui_home_TouchPainter/TouchPainter/paint.html">paint</a> method will get called
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without <a href="ui_home_TouchPainter/TouchPainter/shouldRepaint.html">shouldRepaint</a> being called at all (e.g. if the box changes
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size).</p>
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<p>If a custom delegate has a particularly expensive paint function such that
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repaints should be avoided as much as possible, a <code>RepaintBoundary</code> or
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<code>RenderRepaintBoundary</code> (or other render object with
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<code>RenderObject.isRepaintBoundary</code> set to true) might be helpful.</p>
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<p>The <code>oldDelegate</code> argument will never be null.</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">@override
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bool shouldRepaint(CustomPainter oldDelegate) {
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return true;
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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/script.js"></script>
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</body>
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</html>
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