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after some user interactions.<!--]--></p><div class="_wrapper_1pe7v_1"><button class="_language_1pe7v_9"><span class="_icon_1pe7v_5"><svg xmlns="http://www.w3.org/2000/svg" height="12" viewbox="0 0 24 24" width="12" fill="currentColor"><path d="M0 0h24v24H0z" fill="none"></path><path d="M16 1H4c-1.1 0-2 .9-2 2v14h2V3h12V1zm3 4H8c-1.1 0-2 .9-2 2v14c0 1.1.9 2 2 2h11c1.1 0 2-.9 2-2V7c0-1.1-.9-2-2-2zm0 16H8V7h11v14z"></path></svg></span><span>typescript</span></button><!--[--><pre><code><span class="line"><span class="ct-c6e348">// interact() is doing some stuff, that changes FlatList scroll size</span></span><span class="line"><span class="ct-72a211">type</span><span class="ct-11be9f"> </span><span class="ct-060174">Props</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> { </span><span class="ct-f88463">interact</span><span class="ct-4ad8ce">:</span><span class="ct-11be9f"> () </span><span class="ct-72a211">=></span><span class="ct-11be9f"> </span><span class="ct-61bd19">void</span><span class="ct-11be9f">; }</span></span><span class="line"></span><span class="line"><span class="ct-56e655">const</span><span class="ct-fb91f3"> </span><span class="ct-556769">SomeList</span><span class="ct-f6235c">:</span><span class="ct-fb91f3"> </span><span class="ct-a3c8f0">FC</span><span class="ct-fb91f3"><</span><span class="ct-a3c8f0">Props</span><span class="ct-fb91f3">> </span><span class="ct-f6235c">=</span><span class="ct-fb91f3"> ({ </span><span class="ct-67df46">interact</span><span class="ct-fb91f3"> }) </span><span class="ct-56e655">=></span><span class="ct-fb91f3"> {</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-72a211">const</span><span class="ct-11be9f"> </span><span class="ct-1f2e35">scrollPosition</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-f88463">useRef</span><span class="ct-11be9f">(</span><span class="ct-bf9443">0</span><span class="ct-11be9f">);</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-72a211">const</span><span class="ct-11be9f"> </span><span class="ct-1f2e35">scrollHeight</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-f88463">useRef</span><span class="ct-11be9f">(</span><span class="ct-bf9443">0</span><span class="ct-11be9f">);</span></span><span class="line"><span class="ct-11be9f"> </span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-c6e348">// set it to `true` before interaction and back to `false` right after</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-72a211">const</span><span class="ct-11be9f"> </span><span class="ct-1f2e35">shouldKeepScrollPosition</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-f88463">useRef</span><span class="ct-11be9f">(</span><span class="ct-05ddd1">false</span><span class="ct-11be9f">);</span></span><span class="line"></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-72a211">const</span><span class="ct-11be9f"> </span><span class="ct-1f2e35">onScroll</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-f88463">useCallback</span><span class="ct-11be9f">(</span></span><span class="line"><span class="ct-fb91f3"> (</span><span class="ct-67df46">event</span><span class="ct-f6235c">:</span><span class="ct-fb91f3"> </span><span class="ct-a3c8f0">NativeSyntheticEvent</span><span class="ct-fb91f3"><</span><span class="ct-a3c8f0">NativeScrollEvent</span><span class="ct-fb91f3">>) </span><span class="ct-56e655">=></span><span class="ct-fb91f3"> {</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">scrollPosition</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-fd1ff6">event</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">nativeEvent</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">contentOffset</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">y</span><span class="ct-11be9f">;</span></span><span class="line"><span class="ct-11be9f"> },</span></span><span class="line"><span class="ct-11be9f"> [],</span></span><span class="line"><span class="ct-11be9f"> );</span></span><span class="line"></span><span class="line"><span class="ct-fb91f3"> </span><span class="ct-56e655">const</span><span class="ct-fb91f3"> </span><span class="ct-2bc54d">onContentSizeChange</span><span class="ct-fb91f3"> </span><span class="ct-f6235c">=</span><span class="ct-fb91f3"> </span><span class="ct-556769">useCallback</span><span class="ct-fb91f3">((</span><span class="ct-67df46">_</span><span class="ct-f6235c">:</span><span class="ct-fb91f3"> </span><span class="ct-65dd85">number</span><span class="ct-fb91f3">, </span><span class="ct-67df46">h</span><span class="ct-f6235c">:</span><span class="ct-fb91f3"> </span><span class="ct-65dd85">number</span><span class="ct-fb91f3">) </span><span class="ct-56e655">=></span><span class="ct-fb91f3"> {</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-4ad8ce">if</span><span class="ct-11be9f"> (</span><span class="ct-4ad8ce">!</span><span class="ct-fd1ff6">shouldKeepScrollPosition</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f">) {</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">scrollHeight</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-fd1ff6">h</span><span class="ct-11be9f">;</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-4ad8ce">return</span><span class="ct-11be9f">;</span></span><span class="line"><span class="ct-11be9f"> }</span></span><span class="line"></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">ref</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f">?.</span><span class="ct-f88463">scrollToOffset</span><span class="ct-11be9f">({</span></span><span class="line"><span class="ct-11be9f"> offset: </span><span class="ct-fd1ff6">scrollPosition</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">+</span><span class="ct-11be9f"> (</span><span class="ct-fd1ff6">h</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">-</span><span class="ct-11be9f"> </span><span class="ct-fd1ff6">scrollHeight</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f">),</span></span><span class="line"><span class="ct-11be9f"> animated: </span><span class="ct-05ddd1">false</span><span class="ct-11be9f">,</span></span><span class="line"><span class="ct-11be9f"> });</span></span><span class="line"></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">scrollHeight</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-fd1ff6">h</span><span class="ct-11be9f">;</span></span><span class="line"><span class="ct-11be9f"> }, []);</span></span><span class="line"></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-c6e348">// onInteraction wraps interaction to preserve scroll position</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-72a211">const</span><span class="ct-11be9f"> </span><span class="ct-1f2e35">onInteraction</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-f88463">useCallback</span><span class="ct-11be9f">(</span></span><span class="line"><span class="ct-11be9f"> () </span><span class="ct-72a211">=></span><span class="ct-11be9f"> {</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">shouldKeepScrollPosition</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-05ddd1">true</span><span class="ct-11be9f">;</span></span><span class="line"></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-1f2e35">setTimeout</span><span class="ct-11be9f">(() </span><span class="ct-72a211">=></span><span class="ct-11be9f"> {</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-f88463">interact</span><span class="ct-11be9f">();</span></span><span class="line"><span class="ct-11be9f"> }, </span><span class="ct-bf9443">0</span><span class="ct-11be9f">);</span></span><span class="line"></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-1f2e35">setTimeout</span><span class="ct-11be9f">(() </span><span class="ct-72a211">=></span><span class="ct-11be9f"> {</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">shouldKeepScrollPosition</span><span class="ct-11be9f">.</span><span class="ct-fd1ff6">current</span><span class="ct-11be9f"> </span><span class="ct-4ad8ce">=</span><span class="ct-11be9f"> </span><span class="ct-05ddd1">false</span><span class="ct-11be9f">;</span></span><span class="line"><span class="ct-11be9f"> }, </span><span class="ct-bf9443">500</span><span class="ct-11be9f">);</span></span><span class="line"><span class="ct-11be9f"> },</span></span><span class="line"><span class="ct-11be9f"> [</span><span class="ct-fd1ff6">setSelectedSubThemes</span><span class="ct-11be9f">],</span></span><span class="line"><span class="ct-11be9f"> );</span></span><span class="line"><span class="ct-11be9f"> </span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-4ad8ce">return</span><span class="ct-11be9f"> (</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-4ad8ce"><</span><span class="ct-d860a9">FlatList</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-c6e348">// ...required FlatList options</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">ref</span><span class="ct-4ad8ce">=</span><span class="ct-11be9f">{</span><span class="ct-fd1ff6">ref</span><span class="ct-11be9f">}</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">onContentSizeChange</span><span class="ct-4ad8ce">=</span><span class="ct-11be9f">{</span><span class="ct-fd1ff6">onContentSizeChange</span><span class="ct-11be9f">}</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">onRefresh</span><span class="ct-4ad8ce">=</span><span class="ct-11be9f">{</span><span class="ct-fd1ff6">onRefresh</span><span class="ct-11be9f">}</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-fd1ff6">onScroll</span><span class="ct-4ad8ce">=</span><span class="ct-11be9f">{</span><span class="ct-fd1ff6">onScroll</span><span class="ct-11be9f">}</span></span><span class="line"><span class="ct-11be9f"> </span><span class="ct-4ad8ce">/></span></span><span class="line"><span class="ct-11be9f"> )</span></span><span class="line"><span class="ct-11be9f">}</span></span></code></pre><!--]--></div><style>.ct-d860a9{color:#FFA657}.ct-65dd85{color:#79C0FF}.ct-2bc54d{color:#79C0FF}.ct-fd1ff6{color:#C9D1D9}.ct-05ddd1{color:#79C0FF}.ct-bf9443{color:#79C0FF}.ct-1f2e35{color:#79C0FF}.ct-67df46{color:#FFA657}.ct-a3c8f0{color:#FFA657}.ct-f6235c{color:#FF7B72}.ct-556769{color:#D2A8FF}.ct-fb91f3{color:#C9D1D9}.ct-56e655{color:#FF7B72}.ct-61bd19{color:#79C0FF}.ct-f88463{color:#D2A8FF}.ct-4ad8ce{color:#FF7B72}.ct-060174{color:#FFA657}.ct-11be9f{color:#C9D1D9}.ct-72a211{color:#FF7B72}.ct-c6e348{color:#8B949E}.light .ct-c6e348{color:#93A1A1}.light .ct-72a211{color:#073642}.light .ct-11be9f{color:#657B83}.light .ct-060174{color:#268BD2}.light .ct-4ad8ce{color:#859900}.light .ct-f88463{color:#268BD2}.light .ct-61bd19{color:#859900}.light .ct-56e655{color:#073642}.light .ct-fb91f3{color:#657B83}.light .ct-556769{color:#268BD2}.light .ct-f6235c{color:#859900}.light .ct-a3c8f0{color:#268BD2}.light .ct-67df46{color:#657B83}.light .ct-1f2e35{color:#268BD2}.light .ct-bf9443{color:#D33682}.light .ct-05ddd1{color:#B58900}.light .ct-fd1ff6{color:#268BD2}.light .ct-2bc54d{color:#268BD2}.light .ct-65dd85{color:#859900}.light .ct-d860a9{color:#657B83}</style></div></article><!--]--></main><!--]--><!--]--></div><footer class="_footer_ogxvf_1 _footer_vom09_18 _footer_vom09_18"><div>btw, have a nice day</div><div class="_filler_ogxvf_9"></div><div> (2018 - 2023) <a href="https://github.com/muerwre/" rel="noopener noreferrer" target="_blank">muerwre</a></div></footer></div></div></div></div></div><script type="module">import p from "/frontend/react-native/preserve-flatlist-scroll-position-in-react-native/_payload.js";window.__NUXT__={...p,...((function(a,b,c,d,e,f){return 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