muerwre/muerwre.github.io
1
0
Fork 0
mirror of https://github.com/muerwre/muerwre.github.io.git synced 2025-04-25 02:46:39 +07:00
Code Issues Projects Releases Packages Wiki Activity Actions
muerwre.github.io/api/_content/query/pv8ckH0an3.json
muerwre 25f1a3121c commit dd104eed49 
Author: Fedor Katurov <gotham48@gmail.com>
Date:   Thu Nov 3 10:38:11 2022 +0600

    added whole content
2022-11-03 04:46:54 +00:00

1 line
No EOL
40 KiB
JSON
Raw Blame History

{"_path":"/frontend/react-native/preserve-flatlist-scroll-position-in-react-native","_dir":"react-native","_draft":false,"_partial":false,"_locale":"en","_empty":false,"title":"Preserve FlatList Scroll Position In React Native","description":"Sometimes you need to keep scroll position of FlatList in React Native after some user interactions.","excerpt":{"type":"root","children":[{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Sometimes you need to keep scroll position of "},{"type":"element","tag":"code-inline","props":{},"children":[{"type":"text","value":"FlatList"}]},{"type":"text","value":" in React Native after some user interactions."}]},{"type":"element","tag":"code","props":{"code":"// interact() is doing some stuff, that changes FlatList scroll size\ntype Props = { interact: () => void; }\n\nconst SomeList: FC<Props> = ({ interact }) => {\n const scrollPosition = useRef(0);\n const scrollHeight = useRef(0);\n \n // set it to `true` before interaction and back to `false` right after\n const shouldKeepScrollPosition = useRef(false);\n\n const onScroll = useCallback(\n (event: NativeSyntheticEvent<NativeScrollEvent>) => {\n scrollPosition.current = event.nativeEvent.contentOffset.y;\n },\n [],\n );\n\n const onContentSizeChange = useCallback((_: number, h: number) => {\n if (!shouldKeepScrollPosition.current) {\n scrollHeight.current = h;\n return;\n }\n\n ref.current?.scrollToOffset({\n offset: scrollPosition.current + (h - scrollHeight.current),\n animated: false,\n });\n\n scrollHeight.current = h;\n }, []);\n\n // onInteraction wraps interaction to preserve scroll position\n const onInteraction = useCallback(\n () => {\n shouldKeepScrollPosition.current = true;\n\n setTimeout(() => {\n interact();\n }, 0);\n\n setTimeout(() => {\n shouldKeepScrollPosition.current = false;\n }, 500);\n },\n [setSelectedSubThemes],\n );\n \n return (\n <FlatList\n // ...required FlatList options\n ref={ref}\n onContentSizeChange={onContentSizeChange}\n onRefresh={onRefresh}\n onScroll={onScroll}\n />\n )\n}\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"text","value":"// interact() is doing some stuff, that changes FlatList scroll size\ntype Props = { interact: () => void; }\n\nconst SomeList: FC<Props> = ({ interact }) => {\n const scrollPosition = useRef(0);\n const scrollHeight = useRef(0);\n \n // set it to `true` before interaction and back to `false` right after\n const shouldKeepScrollPosition = useRef(false);\n\n const onScroll = useCallback(\n (event: NativeSyntheticEvent<NativeScrollEvent>) => {\n scrollPosition.current = event.nativeEvent.contentOffset.y;\n },\n [],\n );\n\n const onContentSizeChange = useCallback((_: number, h: number) => {\n if (!shouldKeepScrollPosition.current) {\n scrollHeight.current = h;\n return;\n }\n\n ref.current?.scrollToOffset({\n offset: scrollPosition.current + (h - scrollHeight.current),\n animated: false,\n });\n\n scrollHeight.current = h;\n }, []);\n\n // onInteraction wraps interaction to preserve scroll position\n const onInteraction = useCallback(\n () => {\n shouldKeepScrollPosition.current = true;\n\n setTimeout(() => {\n interact();\n }, 0);\n\n setTimeout(() => {\n shouldKeepScrollPosition.current = false;\n }, 500);\n },\n [setSelectedSubThemes],\n );\n \n return (\n <FlatList\n // ...required FlatList options\n ref={ref}\n onContentSizeChange={onContentSizeChange}\n onRefresh={onRefresh}\n onScroll={onScroll}\n />\n )\n}\n"}]}]}]}]},"body":{"type":"root","children":[{"type":"element","tag":"p","props":{},"children":[{"type":"text","value":"Sometimes you need to keep scroll position of "},{"type":"element","tag":"code-inline","props":{},"children":[{"type":"text","value":"FlatList"}]},{"type":"text","value":" in React Native after some user interactions."}]},{"type":"element","tag":"code","props":{"code":"// interact() is doing some stuff, that changes FlatList scroll size\ntype Props = { interact: () => void; }\n\nconst SomeList: FC<Props> = ({ interact }) => {\n const scrollPosition = useRef(0);\n const scrollHeight = useRef(0);\n \n // set it to `true` before interaction and back to `false` right after\n const shouldKeepScrollPosition = useRef(false);\n\n const onScroll = useCallback(\n (event: NativeSyntheticEvent<NativeScrollEvent>) => {\n scrollPosition.current = event.nativeEvent.contentOffset.y;\n },\n [],\n );\n\n const onContentSizeChange = useCallback((_: number, h: number) => {\n if (!shouldKeepScrollPosition.current) {\n scrollHeight.current = h;\n return;\n }\n\n ref.current?.scrollToOffset({\n offset: scrollPosition.current + (h - scrollHeight.current),\n animated: false,\n });\n\n scrollHeight.current = h;\n }, []);\n\n // onInteraction wraps interaction to preserve scroll position\n const onInteraction = useCallback(\n () => {\n shouldKeepScrollPosition.current = true;\n\n setTimeout(() => {\n interact();\n }, 0);\n\n setTimeout(() => {\n shouldKeepScrollPosition.current = false;\n }, 500);\n },\n [setSelectedSubThemes],\n );\n \n return (\n <FlatList\n // ...required FlatList options\n ref={ref}\n onContentSizeChange={onContentSizeChange}\n onRefresh={onRefresh}\n onScroll={onScroll}\n />\n )\n}\n","language":"typescript"},"children":[{"type":"element","tag":"pre","props":{},"children":[{"type":"element","tag":"code","props":{"__ignoreMap":""},"children":[{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-23639f"},"children":[{"type":"text","value":"// interact() is doing some stuff, that changes FlatList scroll size"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"type"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-143e9a"},"children":[{"type":"text","value":"Props"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" { "}]},{"type":"element","tag":"span","props":{"class":"ct-089a5a"},"children":[{"type":"text","value":"interact"}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" () "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"=>"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-1c1580"},"children":[{"type":"text","value":"void"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"; }"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-37c6e0"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-7e17fd"},"children":[{"type":"text","value":"SomeList"}]},{"type":"element","tag":"span","props":{"class":"ct-b249b4"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-72292b"},"children":[{"type":"text","value":"FC"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":"<"}]},{"type":"element","tag":"span","props":{"class":"ct-72292b"},"children":[{"type":"text","value":"Props"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":"> "}]},{"type":"element","tag":"span","props":{"class":"ct-b249b4"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" ({ "}]},{"type":"element","tag":"span","props":{"class":"ct-194cdd"},"children":[{"type":"text","value":"interact"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" }) "}]},{"type":"element","tag":"span","props":{"class":"ct-37c6e0"},"children":[{"type":"text","value":"=>"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2ed460"},"children":[{"type":"text","value":"scrollPosition"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-089a5a"},"children":[{"type":"text","value":"useRef"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"("}]},{"type":"element","tag":"span","props":{"class":"ct-3a6b54"},"children":[{"type":"text","value":"0"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":");"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2ed460"},"children":[{"type":"text","value":"scrollHeight"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-089a5a"},"children":[{"type":"text","value":"useRef"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"("}]},{"type":"element","tag":"span","props":{"class":"ct-3a6b54"},"children":[{"type":"text","value":"0"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":");"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-23639f"},"children":[{"type":"text","value":"// set it to `true` before interaction and back to `false` right after"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2ed460"},"children":[{"type":"text","value":"shouldKeepScrollPosition"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-089a5a"},"children":[{"type":"text","value":"useRef"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"("}]},{"type":"element","tag":"span","props":{"class":"ct-8fcdb5"},"children":[{"type":"text","value":"false"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":");"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2ed460"},"children":[{"type":"text","value":"onScroll"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-089a5a"},"children":[{"type":"text","value":"useCallback"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"("}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" ("}]},{"type":"element","tag":"span","props":{"class":"ct-194cdd"},"children":[{"type":"text","value":"event"}]},{"type":"element","tag":"span","props":{"class":"ct-b249b4"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-72292b"},"children":[{"type":"text","value":"NativeSyntheticEvent"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":"<"}]},{"type":"element","tag":"span","props":{"class":"ct-72292b"},"children":[{"type":"text","value":"NativeScrollEvent"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":">) "}]},{"type":"element","tag":"span","props":{"class":"ct-37c6e0"},"children":[{"type":"text","value":"=>"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"scrollPosition"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"event"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"nativeEvent"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"contentOffset"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"y"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":";"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" },"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" [],"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" );"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-37c6e0"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-c6e208"},"children":[{"type":"text","value":"onContentSizeChange"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-b249b4"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-7e17fd"},"children":[{"type":"text","value":"useCallback"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":"(("}]},{"type":"element","tag":"span","props":{"class":"ct-194cdd"},"children":[{"type":"text","value":"_"}]},{"type":"element","tag":"span","props":{"class":"ct-b249b4"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-169751"},"children":[{"type":"text","value":"number"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":", "}]},{"type":"element","tag":"span","props":{"class":"ct-194cdd"},"children":[{"type":"text","value":"h"}]},{"type":"element","tag":"span","props":{"class":"ct-b249b4"},"children":[{"type":"text","value":":"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-169751"},"children":[{"type":"text","value":"number"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":") "}]},{"type":"element","tag":"span","props":{"class":"ct-37c6e0"},"children":[{"type":"text","value":"=>"}]},{"type":"element","tag":"span","props":{"class":"ct-e44bc7"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"if"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" ("}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"!"}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"shouldKeepScrollPosition"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":") {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"scrollHeight"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"h"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":";"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"return"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":";"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" }"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"ref"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"?."}]},{"type":"element","tag":"span","props":{"class":"ct-089a5a"},"children":[{"type":"text","value":"scrollToOffset"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"({"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" offset: "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"scrollPosition"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"+"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" ("}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"h"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"-"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"scrollHeight"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"),"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" animated: "}]},{"type":"element","tag":"span","props":{"class":"ct-8fcdb5"},"children":[{"type":"text","value":"false"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":","}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" });"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"scrollHeight"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"h"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":";"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" }, []);"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-23639f"},"children":[{"type":"text","value":"// onInteraction wraps interaction to preserve scroll position"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"const"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2ed460"},"children":[{"type":"text","value":"onInteraction"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-089a5a"},"children":[{"type":"text","value":"useCallback"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"("}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" () "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"=>"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"shouldKeepScrollPosition"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-8fcdb5"},"children":[{"type":"text","value":"true"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":";"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2ed460"},"children":[{"type":"text","value":"setTimeout"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"(() "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"=>"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-089a5a"},"children":[{"type":"text","value":"interact"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"();"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" }, "}]},{"type":"element","tag":"span","props":{"class":"ct-3a6b54"},"children":[{"type":"text","value":"0"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":");"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-2ed460"},"children":[{"type":"text","value":"setTimeout"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"(() "}]},{"type":"element","tag":"span","props":{"class":"ct-74ea31"},"children":[{"type":"text","value":"=>"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" {"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"shouldKeepScrollPosition"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"."}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"current"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-8fcdb5"},"children":[{"type":"text","value":"false"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":";"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" }, "}]},{"type":"element","tag":"span","props":{"class":"ct-3a6b54"},"children":[{"type":"text","value":"500"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":");"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" },"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" ["}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"setSelectedSubThemes"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"],"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" );"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"return"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" ("}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"<"}]},{"type":"element","tag":"span","props":{"class":"ct-d12798"},"children":[{"type":"text","value":"FlatList"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-23639f"},"children":[{"type":"text","value":"// ...required FlatList options"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"ref"}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"{"}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"ref"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"}"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"onContentSizeChange"}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"{"}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"onContentSizeChange"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"}"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"onRefresh"}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"{"}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"onRefresh"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"}"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"onScroll"}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"="}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"{"}]},{"type":"element","tag":"span","props":{"class":"ct-34bf83"},"children":[{"type":"text","value":"onScroll"}]},{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"}"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" "}]},{"type":"element","tag":"span","props":{"class":"ct-04d162"},"children":[{"type":"text","value":"/>"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":" )"}]}]},{"type":"element","tag":"span","props":{"class":"line"},"children":[{"type":"element","tag":"span","props":{"class":"ct-4643a0"},"children":[{"type":"text","value":"}"}]}]}]}]}]},{"type":"element","tag":"style","children":[{"type":"text","value":".ct-d12798{color:#FFA657}.ct-169751{color:#79C0FF}.ct-c6e208{color:#79C0FF}.ct-34bf83{color:#C9D1D9}.ct-8fcdb5{color:#79C0FF}.ct-3a6b54{color:#79C0FF}.ct-2ed460{color:#79C0FF}.ct-194cdd{color:#FFA657}.ct-72292b{color:#FFA657}.ct-b249b4{color:#FF7B72}.ct-7e17fd{color:#D2A8FF}.ct-e44bc7{color:#C9D1D9}.ct-37c6e0{color:#FF7B72}.ct-1c1580{color:#79C0FF}.ct-089a5a{color:#D2A8FF}.ct-04d162{color:#FF7B72}.ct-143e9a{color:#FFA657}.ct-4643a0{color:#C9D1D9}.ct-74ea31{color:#FF7B72}.ct-23639f{color:#8B949E}.light .ct-23639f{color:#93A1A1}.light .ct-74ea31{color:#073642}.light .ct-4643a0{color:#657B83}.light .ct-143e9a{color:#268BD2}.light .ct-04d162{color:#859900}.light .ct-089a5a{color:#268BD2}.light .ct-1c1580{color:#859900}.light .ct-37c6e0{color:#073642}.light .ct-e44bc7{color:#657B83}.light .ct-7e17fd{color:#268BD2}.light .ct-b249b4{color:#859900}.light .ct-72292b{color:#268BD2}.light .ct-194cdd{color:#657B83}.light .ct-2ed460{color:#268BD2}.light .ct-3a6b54{color:#D33682}.light .ct-8fcdb5{color:#B58900}.light .ct-34bf83{color:#268BD2}.light .ct-c6e208{color:#268BD2}.light .ct-169751{color:#859900}.light .ct-d12798{color:#657B83}"}]}],"toc":{"title":"","searchDepth":2,"depth":2,"links":[]}},"_type":"markdown","_id":"content:Frontend:React Native:Preserve FlatList scroll position in React Native.md","_source":"content","_file":"Frontend/React Native/Preserve FlatList scroll position in React Native.md","_extension":"md"}
Reference in a new issue View git blame Copy permalink