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<!DOCTYPE html><html><head><title>Dimensions</title><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><meta name="viewport" content="width=device-width"><meta property="fb:app_id" content="1677033832619985"><meta property="fb:admins" content="121800083"><meta property="og:site_name" content="React Native"><meta property="og:title" content="Dimensions"><meta property="og:url" content="https://facebook.github.io/react-native/index.html"><meta property="og:image" content="https://facebook.github.io/react-native/img/opengraph.png"><meta property="og:description" content="A framework for building native apps using React"><meta name="twitter:site" content="@reactnative"><meta name="twitter:card" content="summary_large_image"><meta property="og:type" content="website"><base href="/react-native/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" 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href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:10px;" class="" href="docs/layout-props.html">Layout Props</a></li><li><a style="margin-left:10px;" class="" href="docs/shadow-props.html">Shadow Props</a></li><li><a style="margin-left:10px;" class="" href="docs/viewproptypes.html">ViewPropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/viewstyleproptypes.html">ViewStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/textstyleproptypes.html">TextStylePropTypes</a></li><li><a style="margin-left:10px;" class="" href="docs/imagestyleproptypes.html">ImageStylePropTypes</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><h1><a class="anchor" name="dimensions"></a>Dimensions <a class="hash-link" href="docs/dimensions.html#dimensions">#</a></h1><div><div></div><span><h3><a class="anchor" name="methods"></a>Methods <a class="hash-link" href="docs/dimensions.html#methods">#</a></h3><div class="props"><div class="prop"><h4 class="methodTitle"><a class="anchor" name="set"></a><span class="methodType">static </span>set<span class="methodType">(dims)</span> <a class="hash-link" href="docs/dimensions.html#set">#</a></h4><div><p>This should only be called from native code by sending the
didUpdateDimensions event.</p><p>@param {object} dims Simple string-keyed object of dimensions to set</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="get"></a><span class="methodType">static </span>get<span class="methodType">(dim)</span> <a class="hash-link" href="docs/dimensions.html#get">#</a></h4><div><p>Initial dimensions are set before <code>runApplication</code> is called so they should
be available before any other require&#x27;s are run, but may be updated later.</p><p>Note: Although dimensions are available immediately, they may change (e.g
due to device rotation) so any rendering logic or styles that depend on
these constants should try to call this function on every render, rather
than caching the value (for example, using inline styles rather than
setting a value in a <code>StyleSheet</code>).</p><p>Example: <code>var {height, width} = Dimensions.get(&#x27;window&#x27;);</code></p><p>@param {string} dim Name of dimension as defined when calling <code>set</code>.
@returns {Object?} Value for the dimension.</p></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="addeventlistener"></a><span class="methodType">static </span>addEventListener<span class="methodType">(type, handler)</span> <a class="hash-link" href="docs/dimensions.html#addeventlistener">#</a></h4><div><p>Add an event handler. Supported events:</p><ul><li><code>change</code>: Fires when a property within the <code>Dimensions</code> object changes. The argument
to the event handler is an object with <code>window</code> and <code>screen</code> properties whose values
are the same as the return values of <code>Dimensions.get(&#x27;window&#x27;)</code> and
<code>Dimensions.get(&#x27;screen&#x27;)</code>, respectively.</li></ul></div></div><div class="prop"><h4 class="methodTitle"><a class="anchor" name="removeeventlistener"></a><span class="methodType">static </span>removeEventListener<span class="methodType">(type, handler)</span> <a class="hash-link" href="docs/dimensions.html#removeeventlistener">#</a></h4><div><p>Remove an event handler.</p></div></div></div></span></div><p class="edit-page-block"><a target="_blank" href="https://github.com/facebook/react-native/blob/master/Libraries/Utilities/Dimensions.js">Improve this page</a> by sending a pull request!</p><div class="docs-prevnext"><a class="docs-prev" href="docs/datepickerandroid.html#content">← Prev</a><a class="docs-next" href="docs/easing.html#content">Next →</a></div></div></section><footer class="nav-footer"><section class="sitemap"><a href="/react-native" class="nav-home"><img src="img/header_logo.png" alt="React Native" width="66" height="58"></a><div><h5><a href="docs/">Docs</a></h5><a href="docs/getting-started.html">Getting Started</a><a href="docs/tutorial.html">Learn the Basics</a><a href="docs/components-and-apis.html">Components and APIs</a><a href="docs/more-resources.html">More Resources</a></div><div><h5><a href="/react-native/support.html">Community</a></h5><a href="/react-native/showcase.html">Who&#x27;s using React Native?</a><a href="http://www.meetup.com/topics/react-native/" target="_blank">Meetups</a><a href="https://www.facebook.com/groups/react.native.community" target="_blank">Facebook Group</a><a href="https://twitter.com/reactnative" target="_blank">Twitter</a></div><div><h5><a href="/react-native/support.html">Help</a></h5><a href="http://stackoverflow.com/questions/tagged/react-native" target="_blank">Stack Overflow</a><a href="https://discord.gg/0ZcbPKXt5bZjGY5n">Reactiflux Chat</a><a href="/react-native/versions.html" target="_blank">Latest Releases</a><a href="https://react-native.canny.io/feature-requests" target="_blank">Feature Requests</a></div><div><h5>More</h5><a href="/react-native/blog">Blog</a><a href="http://facebook.github.io/react/" target="_blank">React</a><a href="https://github.com/facebook/react-native" target="_blank">GitHub</a><div class="githubButton"><a class="github-button" href="https://github.com/facebook/react-native" data-icon="octicon-star" data-count-href="/facebook/react-native/stargazers" data-count-api="/repos/facebook/react-native#stargazers_count" data-count-aria-label="# stargazers on GitHub" aria-label="Star facebook/react-native on GitHub">Star</a></div></div></section><section class="newsletter"><div id="mc_embed_signup"><form action="//reactnative.us10.list-manage.com/subscribe/post?u=db0dd948e2b729ee62625b1a8&amp;id=47cd41008f" method="post" id="mc-embedded-subscribe-form" name="mc-embedded-subscribe-form" class="validate" target="_blank" novalidate><div id="mc_embed_signup_scroll"><label for="mce-EMAIL"><h5>Get the React Native Newsletter</h5></label><input type="email" value="" name="EMAIL" class="email" id="mce-EMAIL" placeholder="email address" required><div style="position:absolute;left:-5000px;" aria-hidden="true"><input type="text" name="b_db0dd948e2b729ee62625b1a8_47cd41008f" tabindex="-1" value=""></div><div class="clear"><input type="submit" value="Sign up" name="subscribe" id="mc-embedded-subscribe" class="button"></div></div></form></div></section><a href="https://code.facebook.com/projects/" target="_blank" class="fbOpenSource"><img src="img/oss_logo.png" alt="Facebook Open Source" width="170" height="45"></a><section class="copyright">Copyright © 2017 Facebook Inc.</section></footer></div><div id="fb-root"></div><script type="text/javascript" src="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.js"></script><script>
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