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1<!doctype html><html lang=en dir=ltr class="docs-wrapper plugin-docs plugin-id-default docs-version-0.79 docs-doc-page docs-doc-id-the-new-architecture/layout-measurements" data-has-hydrated=false><meta charset=UTF-8><meta name=generator content="Docusaurus v3.8.0"><title data-rh=true>Measuring the Layout · React Native</title><meta data-rh=true name=viewport content="width=device-width, initial-scale=1.0"><meta data-rh=true property=og:url content=https://reactnative.dev/docs/the-new-architecture/layout-measurements><meta data-rh=true property=og:locale content=en><meta data-rh=true name=docusaurus_locale content=en><meta data-rh=true name=docsearch:language content=en><meta data-rh=true property=og:image content=https://reactnative.dev/img/logo-share.png><meta data-rh=true name=twitter:card content=summary_large_image><meta data-rh=true name=twitter:image content=https://reactnative.dev/img/logo-share.png><meta data-rh=true name=twitter:site content=@reactnative><meta data-rh=true 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stroke-linecap=round stroke-linejoin=round /></svg><span class=DocSearch-Button-Placeholder>Search</span></span><span class=DocSearch-Button-Keys></span></button></div></div></div><div role=presentation class=navbar-sidebar__backdrop></div></nav><div id=__docusaurus_skipToContent_fallback class="theme-layout-main main-wrapper mainWrapper_MB5r"><div class=docsWrapper__sE8><button aria-label="Scroll back to top" class="clean-btn theme-back-to-top-button backToTopButton_iEvu" type=button></button><div class=docRoot_DfVB><main class="docMainContainer_a9sJ docMainContainerEnhanced_grEJ"><div class="container padding-top--md padding-bottom--lg"><div class=row><div class="col docItemCol_Qr34"><div class=docItemContainer_tjFy><article><div class="tocCollapsible_wXna theme-doc-toc-mobile tocMobile_Ojys"><button type=button class="clean-btn tocCollapsibleButton_iI2p">On this page</button></div><div class="theme-doc-markdown markdown"><header><h1>Measuring the Layout</h1></header> 5<p>Sometimes, you need to measure the current layout to apply some changes to the overall layout or to make decisions and call some specific logic.</p> 6<p>React Native provides some native methods to know what are the measurements of the views.</p> 7<p>The best way to invoke those methods is in a <code>useLayoutEffect</code> hook: this will give you the most recent values for those measurements and it will let you apply changes in the same frame when the measurements are computed.</p> 8<p>Typical code will look like this:</p> 9<div class="language-tsx codeBlockContainer_mQmQ theme-code-block" style=--prism-color:#FFFFFF;--prism-background-color:#282C34><div class=codeBlockTitle_kY6l>tsx</div><div class=codeBlockContent_t_Hd><pre tabindex=0 class="prism-code language-tsx codeBlock_RMoD thin-scrollbar" style=color:#FFFFFF;background-color:#282C34><code class=codeBlockLines_AclH><span class=token-line style=color:#FFFFFF><span class="token keyword" style=color:#c5a5c5>function</span><span class="token plain"> </span><span class="token function" style=color:#79b6f2>AComponent</span><span class="token punctuation" style=color:#657b83>(</span><span class="token plain">children</span><span class="token punctuation" style=color:#657b83>)</span><span class="token plain"> </span><span class="token punctuation" style=color:#657b83>{</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token keyword" style=color:#c5a5c5>const</span><span class="token plain"> targetRef </span><span class="token operator" style=color:#fc929e>=</span><span class="token plain"> </span><span class="token maybe-class-name">React</span><span class="token punctuation" style=color:#657b83>.</span><span class="token method function property-access" style=color:#79b6f2>useRef</span><span class="token punctuation" style=color:#657b83>(</span><span class="token keyword" style=color:#c5a5c5>null</span><span class="token punctuation" style=color:#657b83>)</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token function" style=color:#79b6f2>useLayoutEffect</span><span class="token punctuation" style=color:#657b83>(</span><span class="token punctuation" style=color:#657b83>(</span><span class="token punctuation" style=color:#657b83>)</span><span class="token plain"> </span><span class="token arrow operator" style=color:#fc929e>=></span><span class="token plain"> </span><span class="token punctuation" style=color:#657b83>{</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> targetRef</span><span class="token punctuation" style=color:#657b83>.</span><span class="token property-access">current</span><span class="token operator" style=color:#fc929e>?.</span><span class="token method function property-access" style=color:#79b6f2>measure</span><span class="token punctuation" style=color:#657b83>(</span><span class="token punctuation" style=color:#657b83>(</span><span class="token plain">x</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> y</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> width</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> height</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> pageX</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> pageY</span><span class="token punctuation" style=color:#657b83>)</span><span class="token plain"> </span><span class="token arrow operator" style=color:#fc929e>=></span><span class="token plain"> </span><span class="token punctuation" style=color:#657b83>{</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token comment" style=color:#93a1a1>//do something with the measurements</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token punctuation" style=color:#657b83>}</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token punctuation" style=color:#657b83>}</span><span class="token punctuation" style=color:#657b83>,</span><span class="token plain"> </span><span class="token punctuation" style=color:#657b83>[</span><span class="token plain"> </span><span class="token comment" style=color:#93a1a1>/* add dependencies here */</span><span class="token punctuation" style=color:#657b83>]</span><span class="token punctuation" style=color:#657b83>)</span><span class="token punctuation" style=color:#657b83>;</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain" style=display:inline-block></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token keyword" style=color:#c5a5c5>return</span><span class="token plain"> </span><span class="token punctuation" style=color:#657b83>(</span><span class="token plain"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain"> </span><span class="token tag punctuation" style=color:#657b83>&lt;</span><span class="token tag class-name" style=color:#fac863>View</span><span class="token tag" style=color:#fc929e> </span><span class="token tag attr-name" style=color:#c5a5c5>ref</span><span class="token tag script language-javascript script-punctuation punctuation" style=color:#657b83>=</span><span class="token tag script language-javascript punctuation" style=color:#657b83>{</span><span class="token tag script language-javascript" style=color:#fc929e>targetRef</span><span class="token tag script language-javascript punctuation" style=color:#657b83>}</span><span class="token tag punctuation" style=color:#657b83>></span><span class="token plain-text"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain-text"> </span><span class="token punctuation" style=color:#657b83>{</span><span class="token plain">children</span><span class="token punctuation" style=color:#657b83>}</span><span class="token plain-text"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain-text"> </span><span class="token tag punctuation" style=color:#657b83>&lt;</span><span class="token tag class-name" style=color:#fac863>View</span><span class="token tag" style=color:#fc929e> </span><span class="token tag punctuation" style=color:#657b83>/></span><span class="token plain-text"></span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain-text"> );</span><br></span><span class=token-line style=color:#FFFFFF><span class="token plain-text">}</span><br></span></code></pre></div></div> 10<div class="theme-admonition theme-admonition-note admonition_WCGJ alert alert--secondary"><div class=admonitionHeading_GCBg><span class=admonitionIcon_L39b><svg viewBox="0 0 14 16"><path fill-rule=evenodd d="M6.3 5.69a.942.942 0 0 1-.28-.7c0-.28.09-.52.28-.7.19-.18.42-.28.7-.28.28 0 .52.09.7.28.18.19.28.42.28.7 0 .28-.09.52-.28.7a1 1 0 0 1-.7.3c-.28 0-.52-.11-.7-.3zM8 7.99c-.02-.25-.11-.48-.31-.69-.2-.19-.42-.3-.69-.31H6c-.27.02-.48.13-.69.31-.2.2-.3.44-.31.69h1v3c.02.27.11.5.31.69.2.2.42.31.69.31h1c.27 0 .48-.11.69-.31.2-.19.3-.42.31-.69H8V7.98v.01zM7 2.3c-3.14 0-5.7 2.54-5.7 5.68 0 3.14 2.56 5.7 5.7 5.7s5.7-2.55 5.7-5.7c0-3.15-2.56-5.69-5.7-5.69v.01zM7 .98c3.86 0 7 3.14 7 7s-3.14 7-7 7-7-3.12-7-7 3.14-7 7-7z"/></svg></span>note</div><div class=admonitionContent_pbrs><p>The methods described here are available on most of the default components provided by React Native. However, they are <em>not</em> available on composite components that aren't directly backed by a native view. This will generally include most components that you define in your own app.</div></div> 11<h2 class="anchor anchorWithStickyNavbar_JmGV" id=measurecallback>measure(callback)<a href=#measurecallback class=hash-link aria-label="Direct link to measure(callback)" title="Direct link to measure(callback)">​</a></h2> 12<p>Determines the location on screen (<code>x</code> and <code>y</code>), <code>width</code>, and <code>height</code> in the viewport of the given view. Returns the values via an async callback. If successful, the callback will be called with the following arguments:</p> 13<ul> 14<li><code>x</code>: the <code>x</code> coordinate of the origin (top-left corner) of the measured view in the viewport.</li> 15<li><code>y</code>: the <code>y</code> coordinate of the origin (top-left corner) of the measured view in the viewport.</li> 16<li><code>width</code>: the <code>width</code> of the view.</li> 17<li><code>height</code>: the <code>height</code> of the view.</li> 18<li><code>pageX</code>: the <code>x</code> coordinate of the view in the viewport (typically the whole screen).</li> 19<li><code>pageY</code>: the <code>y</code> coordinate of the view in the viewport (typically the whole screen).</li> 20</ul> 21<p>Also the <code>width</code> and <code>height</code> returned by <code>measure()</code> are the <code>width</code> and <code>height</code> of the component in the viewport.</p> 22<h2 class="anchor anchorWithStickyNavbar_JmGV" id=measureinwindowcallback>measureInWindow(callback)<a href=#measureinwindowcallback class=hash-link aria-label="Direct link to measureInWindow(callback)" title="Direct link to measureInWindow(callback)">​</a></h2> 23<p>Determines the location (<code>x</code> and <code>y</code>) of the given view in the window and returns the values via an async callback. If the React root view is embedded in another native view, this will give you the absolute coordinates. If successful, the callback will be called with the following arguments:</p> 24<ul> 25<li><code>x</code>: the <code>x</code> coordinate of the view in the current window.</li> 26<li><code>y</code>: the <code>y</code> coordinate of the view in the current window.</li> 27<li><code>width</code>: the <code>width</code> of the view.</li> 28<li><code>height</code>: the <code>height</code> of the view.</li> 29</ul></div><footer class="theme-doc-footer docusaurus-mt-lg"><div class="theme-doc-footer-edit-meta-row row"><div class=editButtons_t0bR><a href=https://github.com/facebook/react-native-website/edit/main/docs/the-new-architecture/layout-measurements.md target=_blank rel="noopener noreferrer" class=theme-edit-this-page><svg fill=currentColor height=20 width=20 viewBox="0 0 40 40" class=iconEdit_bHB7 aria-hidden=true><g><path d="m34.5 11.7l-3 3.1-6.3-6.3 3.1-3q0.5-0.5 1.2-0.5t1.1 0.5l3.9 3.9q0.5 0.4 0.5 1.1t-0.5 1.2z m-29.5 17.1l18.4-18.5 6.3 6.3-18.4 18.4h-6.3v-6.2z"/></g></svg>Edit page 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