582 lines
53 KiB
HTML
582 lines
53 KiB
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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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<title>EventHelper - Cesium Documentation</title>
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<!--[if lt IE 9]>
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<script src="javascript/html5.js"></script>
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<![endif]-->
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<link href="styles/jsdoc-default.css" rel="stylesheet">
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<link href="styles/prism.css" rel="stylesheet">
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</head>
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<body>
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<div id="main">
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<h1 class="page-title">
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<a href="index.html"><img src="Images/CesiumLogo.png" class="cesiumLogo"></a>
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EventHelper
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<div class="titleCenterer"></div>
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</h1>
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<section>
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<header>
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</header>
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<article>
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<div class="container-overview">
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<div class="nameContainer">
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<h4 class="name" id="EventHelper">
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<a href="#EventHelper" class="doc-link"></a>
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new Cesium.EventHelper<span class="signature">()</span>
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<div class="source-link rightLinks">
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<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/EventHelper.js#L24">Core/EventHelper.js 24</a>
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</div>
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</h4>
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</div>
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<div class="description">
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A convenience object that simplifies the common pattern of attaching event listeners
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to several events, then removing all those listeners at once later, for example, in
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a destroy method.
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</div>
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<dl class="details">
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<h5>Example:</h5>
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<pre><code class="language-javascript">const helper = new Cesium.EventHelper();
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helper.add(someObject.event, listener1, this);
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helper.add(otherObject.event, listener2, this);
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// later...
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helper.removeAll();</code></pre>
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<h5>See:</h5>
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<ul class="see-list">
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<li><a href="Event.html">Event</a></li>
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</ul>
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</dl>
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</div>
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<h3 class="subsection-title">Methods</h3>
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<div class="nameContainer">
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<h4 class="name" id="add">
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<a href="#add" class="doc-link"></a>
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add<span class="signature">(event, listener, <span class="optional">scope</span>)</span> → <span class="type-signature returnType"><a href="EventHelper.html#.RemoveCallback">EventHelper.RemoveCallback</a></span>
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<div class="source-link rightLinks">
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<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/EventHelper.js#L39">Core/EventHelper.js 39</a>
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</div>
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</h4>
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</div>
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<div class="description">
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Adds a listener to an event, and records the registration to be cleaned up later.
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</div>
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<table class="params">
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<thead>
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<tr>
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<th>Name</th>
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<th>Type</th>
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<th class="last">Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td class="name"><code>event</code></td>
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<td class="type">
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<span class="param-type"><a href="Event.html">Event</a></span>
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</td>
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<td class="description last">
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The event to attach to.</td>
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</tr>
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<tr>
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<td class="name"><code>listener</code></td>
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<td class="type">
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<span class="param-type">function</span>
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</td>
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<td class="description last">
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The function to be executed when the event is raised.</td>
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</tr>
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<tr>
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<td class="name"><code>scope</code></td>
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<td class="type">
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<span class="param-type">Object</span>
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</td>
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<td class="description last">
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<span class="optional">optional</span>
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An optional object scope to serve as the <code>this</code>
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pointer in which the listener function will execute.</td>
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</tr>
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</tbody>
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</table>
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<h5>Returns:</h5>
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<div class="param-desc">
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A function that will remove this event listener when invoked.
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</div>
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<dl class="details">
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<h5>See:</h5>
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<ul class="see-list">
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<li><a href="Event.html#addEventListener">Event#addEventListener</a></li>
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</ul>
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</dl>
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<div class="nameContainer">
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<h4 class="name" id="removeAll">
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<a href="#removeAll" class="doc-link"></a>
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removeAll<span class="signature">()</span>
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<div class="source-link rightLinks">
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<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/EventHelper.js#L62">Core/EventHelper.js 62</a>
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</div>
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</h4>
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</div>
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<div class="description">
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Unregisters all previously added listeners.
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</div>
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<dl class="details">
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<h5>See:</h5>
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<ul class="see-list">
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<li><a href="Event.html#removeEventListener">Event#removeEventListener</a></li>
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</ul>
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</dl>
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<h3 class="subsection-title">Type Definitions</h3>
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<div class="nameContainer">
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<h4 class="name" id=".RemoveCallback">
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<a href="#.RemoveCallback" class="doc-link"></a>
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Cesium.EventHelper.RemoveCallback<span class="signature">()</span>
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<div class="source-link rightLinks">
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<a href="https://github.com/CesiumGS/cesium/blob/1.91/Source/Core/EventHelper.js#L70">Core/EventHelper.js 70</a>
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</div>
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</h4>
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</div>
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<div class="description">
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A function that removes a listener.
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<dl class="details">
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</dl>
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</article>
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</section>
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