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Author: Fedor Katurov <gotham48@gmail.com>
Date: Sun Nov 27 19:29:56 2022 +0600
added webgl basics
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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-a2a2a6">// interact() is doing some stuff, that changes FlatList scroll size</span></span><span class="line"><span class="ct-8abe9c">type</span><span class="ct-3ee0f8"> </span><span class="ct-a2a2f2">Props</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> { </span><span class="ct-5f1c04">interact</span><span class="ct-d45bc2">:</span><span class="ct-3ee0f8"> () </span><span class="ct-8abe9c">=></span><span class="ct-3ee0f8"> </span><span class="ct-1564d7">void</span><span class="ct-3ee0f8">; }</span></span><span class="line"></span><span class="line"><span class="ct-312ba2">const</span><span class="ct-ad522b"> </span><span class="ct-983266">SomeList</span><span class="ct-86b315">:</span><span class="ct-ad522b"> </span><span class="ct-03c23e">FC</span><span class="ct-ad522b"><</span><span class="ct-03c23e">Props</span><span class="ct-ad522b">> </span><span class="ct-86b315">=</span><span class="ct-ad522b"> ({ </span><span class="ct-572057">interact</span><span class="ct-ad522b"> }) </span><span class="ct-312ba2">=></span><span class="ct-ad522b"> {</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-8abe9c">const</span><span class="ct-3ee0f8"> </span><span class="ct-b0dd0b">scrollPosition</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-5f1c04">useRef</span><span class="ct-3ee0f8">(</span><span class="ct-727017">0</span><span class="ct-3ee0f8">);</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-8abe9c">const</span><span class="ct-3ee0f8"> </span><span class="ct-b0dd0b">scrollHeight</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-5f1c04">useRef</span><span class="ct-3ee0f8">(</span><span class="ct-727017">0</span><span class="ct-3ee0f8">);</span></span><span class="line"><span class="ct-3ee0f8"> </span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a2a2a6">// set it to `true` before interaction and back to `false` right after</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-8abe9c">const</span><span class="ct-3ee0f8"> </span><span class="ct-b0dd0b">shouldKeepScrollPosition</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-5f1c04">useRef</span><span class="ct-3ee0f8">(</span><span class="ct-1f9325">false</span><span class="ct-3ee0f8">);</span></span><span class="line"></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-8abe9c">const</span><span class="ct-3ee0f8"> </span><span class="ct-b0dd0b">onScroll</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-5f1c04">useCallback</span><span class="ct-3ee0f8">(</span></span><span class="line"><span class="ct-ad522b"> (</span><span class="ct-572057">event</span><span class="ct-86b315">:</span><span class="ct-ad522b"> </span><span class="ct-03c23e">NativeSyntheticEvent</span><span class="ct-ad522b"><</span><span class="ct-03c23e">NativeScrollEvent</span><span class="ct-ad522b">>) </span><span class="ct-312ba2">=></span><span class="ct-ad522b"> {</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">scrollPosition</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">event</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">nativeEvent</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">contentOffset</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">y</span><span class="ct-3ee0f8">;</span></span><span class="line"><span class="ct-3ee0f8"> },</span></span><span class="line"><span class="ct-3ee0f8"> [],</span></span><span class="line"><span class="ct-3ee0f8"> );</span></span><span class="line"></span><span class="line"><span class="ct-ad522b"> </span><span class="ct-312ba2">const</span><span class="ct-ad522b"> </span><span class="ct-dd0df0">onContentSizeChange</span><span class="ct-ad522b"> </span><span class="ct-86b315">=</span><span class="ct-ad522b"> </span><span class="ct-983266">useCallback</span><span class="ct-ad522b">((</span><span class="ct-572057">_</span><span class="ct-86b315">:</span><span class="ct-ad522b"> </span><span class="ct-cc4a81">number</span><span class="ct-ad522b">, </span><span class="ct-572057">h</span><span class="ct-86b315">:</span><span class="ct-ad522b"> </span><span class="ct-cc4a81">number</span><span class="ct-ad522b">) </span><span class="ct-312ba2">=></span><span class="ct-ad522b"> {</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">if</span><span class="ct-3ee0f8"> (</span><span class="ct-d45bc2">!</span><span class="ct-a6edd9">shouldKeepScrollPosition</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8">) {</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">scrollHeight</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">h</span><span class="ct-3ee0f8">;</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">return</span><span class="ct-3ee0f8">;</span></span><span class="line"><span class="ct-3ee0f8"> }</span></span><span class="line"></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">ref</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8">?.</span><span class="ct-5f1c04">scrollToOffset</span><span class="ct-3ee0f8">({</span></span><span class="line"><span class="ct-3ee0f8"> offset: </span><span class="ct-a6edd9">scrollPosition</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">+</span><span class="ct-3ee0f8"> (</span><span class="ct-a6edd9">h</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">-</span><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">scrollHeight</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8">),</span></span><span class="line"><span class="ct-3ee0f8"> animated: </span><span class="ct-1f9325">false</span><span class="ct-3ee0f8">,</span></span><span class="line"><span class="ct-3ee0f8"> });</span></span><span class="line"></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">scrollHeight</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">h</span><span class="ct-3ee0f8">;</span></span><span class="line"><span class="ct-3ee0f8"> }, []);</span></span><span class="line"></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a2a2a6">// onInteraction wraps interaction to preserve scroll position</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-8abe9c">const</span><span class="ct-3ee0f8"> </span><span class="ct-b0dd0b">onInteraction</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-5f1c04">useCallback</span><span class="ct-3ee0f8">(</span></span><span class="line"><span class="ct-3ee0f8"> () </span><span class="ct-8abe9c">=></span><span class="ct-3ee0f8"> {</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">shouldKeepScrollPosition</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-1f9325">true</span><span class="ct-3ee0f8">;</span></span><span class="line"></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-b0dd0b">setTimeout</span><span class="ct-3ee0f8">(() </span><span class="ct-8abe9c">=></span><span class="ct-3ee0f8"> {</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-5f1c04">interact</span><span class="ct-3ee0f8">();</span></span><span class="line"><span class="ct-3ee0f8"> }, </span><span class="ct-727017">0</span><span class="ct-3ee0f8">);</span></span><span class="line"></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-b0dd0b">setTimeout</span><span class="ct-3ee0f8">(() </span><span class="ct-8abe9c">=></span><span class="ct-3ee0f8"> {</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">shouldKeepScrollPosition</span><span class="ct-3ee0f8">.</span><span class="ct-a6edd9">current</span><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8"> </span><span class="ct-1f9325">false</span><span class="ct-3ee0f8">;</span></span><span class="line"><span class="ct-3ee0f8"> }, </span><span class="ct-727017">500</span><span class="ct-3ee0f8">);</span></span><span class="line"><span class="ct-3ee0f8"> },</span></span><span class="line"><span class="ct-3ee0f8"> [</span><span class="ct-a6edd9">setSelectedSubThemes</span><span class="ct-3ee0f8">],</span></span><span class="line"><span class="ct-3ee0f8"> );</span></span><span class="line"><span class="ct-3ee0f8"> </span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">return</span><span class="ct-3ee0f8"> (</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-d45bc2"><</span><span class="ct-bdcf21">FlatList</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a2a2a6">// ...required FlatList options</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">ref</span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8">{</span><span class="ct-a6edd9">ref</span><span class="ct-3ee0f8">}</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">onContentSizeChange</span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8">{</span><span class="ct-a6edd9">onContentSizeChange</span><span class="ct-3ee0f8">}</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">onRefresh</span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8">{</span><span class="ct-a6edd9">onRefresh</span><span class="ct-3ee0f8">}</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-a6edd9">onScroll</span><span class="ct-d45bc2">=</span><span class="ct-3ee0f8">{</span><span class="ct-a6edd9">onScroll</span><span class="ct-3ee0f8">}</span></span><span class="line"><span class="ct-3ee0f8"> </span><span class="ct-d45bc2">/></span></span><span class="line"><span class="ct-3ee0f8"> )</span></span><span class="line"><span class="ct-3ee0f8">}</span></span></code></pre><!--]--></div><style>.ct-bdcf21{color:#FFA657}.ct-cc4a81{color:#79C0FF}.ct-dd0df0{color:#79C0FF}.ct-a6edd9{color:#C9D1D9}.ct-1f9325{color:#79C0FF}.ct-727017{color:#79C0FF}.ct-b0dd0b{color:#79C0FF}.ct-572057{color:#FFA657}.ct-03c23e{color:#FFA657}.ct-86b315{color:#FF7B72}.ct-983266{color:#D2A8FF}.ct-ad522b{color:#C9D1D9}.ct-312ba2{color:#FF7B72}.ct-1564d7{color:#79C0FF}.ct-5f1c04{color:#D2A8FF}.ct-d45bc2{color:#FF7B72}.ct-a2a2f2{color:#FFA657}.ct-3ee0f8{color:#C9D1D9}.ct-8abe9c{color:#FF7B72}.ct-a2a2a6{color:#8B949E}.light .ct-a2a2a6{color:#93A1A1}.light .ct-8abe9c{color:#073642}.light .ct-3ee0f8{color:#657B83}.light .ct-a2a2f2{color:#268BD2}.light .ct-d45bc2{color:#859900}.light .ct-5f1c04{color:#268BD2}.light .ct-1564d7{color:#859900}.light .ct-312ba2{color:#073642}.light .ct-ad522b{color:#657B83}.light .ct-983266{color:#268BD2}.light .ct-86b315{color:#859900}.light .ct-03c23e{color:#268BD2}.light .ct-572057{color:#657B83}.light .ct-b0dd0b{color:#268BD2}.light .ct-727017{color:#D33682}.light .ct-1f9325{color:#B58900}.light .ct-a6edd9{color:#268BD2}.light .ct-dd0df0{color:#268BD2}.light .ct-cc4a81{color:#859900}.light .ct-bdcf21{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 - 2022) <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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