85 lines
2.8 KiB
JavaScript
85 lines
2.8 KiB
JavaScript
import * as React from 'react';
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import { mergeCallbacks, slot, useAnimationFrame, useMergedRefs, useIsomorphicLayoutEffect, getIntrinsicElementProps } from '@fluentui/react-utilities';
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import { useDrawerContext_unstable } from '../../contexts/drawerContext';
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/**
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* @internal
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*
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* Get the current scroll state of the DrawerBody.
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*
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* @param element - HTMLElement to check scroll state of
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*/ const getScrollState = ({ scrollTop, scrollHeight, clientHeight })=>{
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if (scrollHeight <= clientHeight) {
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return 'none';
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}
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if (scrollTop === 0) {
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return 'top';
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}
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if (scrollTop + clientHeight === scrollHeight) {
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return 'bottom';
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}
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return 'middle';
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};
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/**
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* Create the state required to render DrawerBody.
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*
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* The returned state can be modified with hooks such as useDrawerBodyStyles_unstable,
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* before being passed to renderDrawerBody_unstable.
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*
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* @param props - props from this instance of DrawerBody
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* @param ref - reference to root HTMLElement of DrawerBody
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*/ export const useDrawerBody_unstable = (props, ref)=>{
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const { setScrollState } = useDrawerContext_unstable();
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const scrollRef = React.useRef(null);
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const [setAnimationFrame, cancelAnimationFrame] = useAnimationFrame();
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const updateScrollState = React.useCallback(()=>{
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if (!scrollRef.current) {
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return;
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}
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setScrollState(getScrollState(scrollRef.current));
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}, [
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setScrollState
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]);
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const onScroll = React.useCallback(()=>{
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cancelAnimationFrame();
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setAnimationFrame(()=>updateScrollState());
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}, [
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cancelAnimationFrame,
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setAnimationFrame,
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updateScrollState
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]);
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useIsomorphicLayoutEffect(()=>{
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cancelAnimationFrame();
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setAnimationFrame(()=>updateScrollState());
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/* update scroll state when children changes */ return ()=>cancelAnimationFrame();
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}, [
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props.children,
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cancelAnimationFrame,
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updateScrollState,
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setAnimationFrame
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]);
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useIsomorphicLayoutEffect(()=>{
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cancelAnimationFrame();
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setAnimationFrame(()=>updateScrollState());
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return ()=>cancelAnimationFrame();
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}, [
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cancelAnimationFrame,
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updateScrollState,
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setAnimationFrame
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]);
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return {
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components: {
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root: 'div'
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},
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root: slot.always(getIntrinsicElementProps('div', {
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// FIXME:
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// `ref` is wrongly assigned to be `HTMLElement` instead of `HTMLDivElement`
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// but since it would be a breaking change to fix it, we are casting ref to it's proper type
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ref: useMergedRefs(ref, scrollRef),
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...props,
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onScroll: mergeCallbacks(props.onScroll, onScroll)
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}), {
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elementType: 'div'
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})
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};
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};
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