commit d9e0f239ba5e9dd50f9a66e85891e7b1012a8332 · kitten.sh/use-interactions

+1 -86

src/useScrollRestoration.ts

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       import { useLayoutEffect } from './utils/react';

     

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       import { observeScrollHeight } from './utils/observeScrollHeight';

     

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       import { Ref } from './types';

     

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       const mutationObservers: Map<HTMLElement, MutationObserver> = new Map();

     

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       const resizeListeners: Map<HTMLElement, Array<() => void>> = new Map();

     

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       const resizeObserver = new ResizeObserver(entries => {

     

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         const parents = new Set<Element>();

     

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         for (let i = 0; i < entries.length; i++) {

     

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           const parent = entries[i].target.parentElement;

     

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           if (parent && !parents.has(parent)) {

     

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             parents.add(parent);

     

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             const listeners = resizeListeners.get(parent) || [];

     

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             for (let i = 0; i < listeners.length; i++) listeners[i]();

     

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           }

     

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         }

     

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       });

     

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       function observeScrollHeight(

     

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         element: HTMLElement,

     

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         onScrollHeightChange: (scrollHeight: number) => void

     

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       ): () => void {

     

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         const listeners = resizeListeners.get(element) || [];

     

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         const isFirstListener = !listeners.length;

     

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         resizeListeners.set(element, listeners);

     

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         let previousScrollHeight: null | number = null;

     

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         let hasUnmounted = false;

     

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         const onResize = () => {

     

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           const scrollHeight = element.scrollHeight || 0;

     

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           if (!hasUnmounted && scrollHeight !== previousScrollHeight) {

     

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             onScrollHeightChange(element.scrollHeight);

     

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             previousScrollHeight = scrollHeight;

     

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           }

     

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         };

     

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         listeners.push(onResize);

     

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         if (isFirstListener) {

     

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           const mutationObserver = new MutationObserver(entries => {

     

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             for (let i = 0; i < entries.length; i++) {

     

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               const entry = entries[i];

     

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               for (let j = 0; j < entry.addedNodes.length; j++) {

     

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                 const node = entry.addedNodes[j];

     

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                 if (node.nodeType === Node.ELEMENT_NODE) {

     

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                   resizeObserver.observe(node as Element);

     

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                 }

     

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               }

     

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               for (let j = 0; j < entry.removedNodes.length; j++) {

     

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                 const node = entry.removedNodes[j];

     

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                 if (node.nodeType === Node.ELEMENT_NODE) {

     

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                   resizeObserver.unobserve(node as Element);

     

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                 }

     

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               }

     

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             }

     

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           });

     

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           const childNodes = element.childNodes;

     

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           for (let i = 0; i < childNodes.length; i++)

     

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             if (childNodes[i].nodeType === Node.ELEMENT_NODE)

     

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               resizeObserver.observe(childNodes[i] as Element);

     

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           mutationObserver.observe(element, { childList: true });

     

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           mutationObservers.set(element, mutationObserver);

     

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         }

     

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         requestAnimationFrame(onResize);

     

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         return () => {

     

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           const listeners = resizeListeners.get(element) || [];

     

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           listeners.splice(listeners.indexOf(onResize), 1);

     

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           hasUnmounted = true;

     

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           if (!listeners.length) {

     

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             const mutationObserver = mutationObservers.get(element);

     

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             if (mutationObserver) mutationObserver.disconnect();

     

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             const childNodes = element.childNodes;

     

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             for (let i = 0; i < childNodes.length; i++)

     

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               if (childNodes[i].nodeType === Node.ELEMENT_NODE)

     

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                 resizeObserver.unobserve(childNodes[i] as Element);

     

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             resizeListeners.delete(element);

     

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             mutationObservers.delete(element);

     

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           }

     

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         };

     

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       }

     

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       const getIdForState = (() => {

     

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         const defaultState = {};

+85

src/utils/observeScrollHeight.ts

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       const mutationObservers: Map<HTMLElement, MutationObserver> = new Map();

     

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       const resizeListeners: Map<HTMLElement, Array<() => void>> = new Map();

     

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       const resizeObserver = new ResizeObserver(entries => {

     

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         const parents = new Set<Element>();

     

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         for (let i = 0; i < entries.length; i++) {

     

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           const parent = entries[i].target.parentElement;

     

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           if (parent && !parents.has(parent)) {

     

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             parents.add(parent);

     

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             const listeners = resizeListeners.get(parent) || [];

     

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             for (let i = 0; i < listeners.length; i++) listeners[i]();

     

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           }

     

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         }

     

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       });

     

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       export function observeScrollHeight(

     

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         element: HTMLElement,

     

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         onScrollHeightChange: (scrollHeight: number) => void

     

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       ): () => void {

     

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         const listeners = resizeListeners.get(element) || [];

     

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         const isFirstListener = !listeners.length;

     

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         resizeListeners.set(element, listeners);

     

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         let previousScrollHeight: null | number = null;

     

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         let hasUnmounted = false;

     

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         const onResize = () => {

     

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           const scrollHeight = element.scrollHeight || 0;

     

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           if (!hasUnmounted && scrollHeight !== previousScrollHeight) {

     

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             onScrollHeightChange(element.scrollHeight);

     

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             previousScrollHeight = scrollHeight;

     

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           }

     

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         };

     

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         listeners.push(onResize);

     

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         if (isFirstListener) {

     

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           const mutationObserver = new MutationObserver(entries => {

     

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             for (let i = 0; i < entries.length; i++) {

     

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               const entry = entries[i];

     

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               for (let j = 0; j < entry.addedNodes.length; j++) {

     

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                 const node = entry.addedNodes[j];

     

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                 if (node.nodeType === Node.ELEMENT_NODE) {

     

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                   resizeObserver.observe(node as Element);

     

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                 }

     

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               }

     

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               for (let j = 0; j < entry.removedNodes.length; j++) {

     

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                 const node = entry.removedNodes[j];

     

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                 if (node.nodeType === Node.ELEMENT_NODE) {

     

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                   resizeObserver.unobserve(node as Element);

     

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                 }

     

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               }

     

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             }

     

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           });

     

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           const childNodes = element.childNodes;

     

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           for (let i = 0; i < childNodes.length; i++)

     

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             if (childNodes[i].nodeType === Node.ELEMENT_NODE)

     

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               resizeObserver.observe(childNodes[i] as Element);

     

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           mutationObserver.observe(element, { childList: true });

     

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           mutationObservers.set(element, mutationObserver);

     

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         }

     

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         requestAnimationFrame(onResize);

     

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         return () => {

     

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           const listeners = resizeListeners.get(element) || [];

     

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           listeners.splice(listeners.indexOf(onResize), 1);

     

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           hasUnmounted = true;

     

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           if (!listeners.length) {

     

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             const mutationObserver = mutationObservers.get(element);

     

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             if (mutationObserver) mutationObserver.disconnect();

     

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             const childNodes = element.childNodes;

     

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             for (let i = 0; i < childNodes.length; i++)

     

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               if (childNodes[i].nodeType === Node.ELEMENT_NODE)

     

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                 resizeObserver.unobserve(childNodes[i] as Element);

     

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             resizeListeners.delete(element);

     

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             mutationObservers.delete(element);

     

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           }

     

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         };

     

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       }