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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,140 @@ | ||
| import { | ||
| useEffect, | ||
| useRef, | ||
| } from 'react'; | ||
| import { | ||
| isMobile, | ||
| } from '../../util/util'; | ||
| import { findDOMNode } from 'react-dom'; | ||
| import { notify } from '../../events/events'; | ||
| import { ScrollViewData } from '../navigation/scroll-bar'; | ||
|
|
||
| const useScrollbar = (controller: string) => { | ||
| const observer = useRef<IntersectionObserver | null>(null); | ||
|
|
||
| const lastScrollViewHeight = useRef(0); | ||
| const lastContentHeight = useRef(0); | ||
| const lastOffset = useRef(0); | ||
|
|
||
| useEffect(() => { | ||
| if (isMobile()) { | ||
| return; | ||
| } | ||
|
|
||
| return () => { | ||
| if (observer.current) { | ||
| observer.current.disconnect(); | ||
| observer.current = null; | ||
| } | ||
| } | ||
| }, []); | ||
|
|
||
| return useRef({ | ||
| onLayout: (params) => { | ||
| if (isMobile()) { | ||
| return; | ||
| } | ||
|
|
||
| lastScrollViewHeight.current = params.nativeEvent.layout.height; | ||
|
|
||
| notify<ScrollViewData>( | ||
| 'main-scroll-view', | ||
| { | ||
| controller, | ||
| scrollViewHeight: lastScrollViewHeight.current, | ||
| contentHeight: lastContentHeight.current, | ||
| offset: lastOffset.current, | ||
| } | ||
| ); | ||
| }, | ||
| onContentSizeChange: (contentWidth, contentHeight) => { | ||
| if (isMobile()) { | ||
| return; | ||
| } | ||
|
|
||
| lastContentHeight.current = contentHeight; | ||
|
|
||
| notify<ScrollViewData>( | ||
| 'main-scroll-view', | ||
| { | ||
| controller, | ||
| scrollViewHeight: lastScrollViewHeight.current, | ||
| contentHeight: lastContentHeight.current, | ||
| offset: lastOffset.current, | ||
| } | ||
| ); | ||
| }, | ||
| onScroll: ({nativeEvent}) => { | ||
| if (isMobile()) { | ||
| return; | ||
| } | ||
|
|
||
| lastOffset.current = nativeEvent.contentOffset.y; | ||
|
|
||
| notify<ScrollViewData>( | ||
| 'main-scroll-view', | ||
| { | ||
| controller, | ||
| offset: lastOffset.current, | ||
| } | ||
| ) | ||
| }, | ||
| showsVerticalScrollIndicator: isMobile(), | ||
| observeListRef: (node): void => { | ||
| if (isMobile()) { | ||
| return; | ||
| } | ||
| if (!node) { | ||
| return; | ||
| } | ||
|
|
||
| if (observer.current) { | ||
| observer.current.disconnect(); | ||
| } | ||
|
|
||
| const onThumbDrag = (offset: number) => { | ||
| if (typeof node.scrollToOffset === 'function') { | ||
| node.scrollToOffset({ offset, animated: false }); | ||
| } else if (typeof node.scrollTo === 'function') { | ||
| node.scrollTo({ y: offset, animated: false }); | ||
| } else { | ||
| throw new Error('No scroll method found on ref'); | ||
| } | ||
| }; | ||
|
|
||
| observer.current = new IntersectionObserver( | ||
| ([entry]) => { | ||
| if (!entry.isIntersecting) { | ||
| notify<ScrollViewData>( | ||
| 'main-scroll-view', | ||
| { | ||
| controller, | ||
| onThumbDrag: null, | ||
| } | ||
| ); | ||
|
|
||
| return; | ||
| } | ||
|
|
||
| notify<ScrollViewData>( | ||
| 'main-scroll-view', | ||
| { | ||
| controller, | ||
| scrollViewHeight: lastScrollViewHeight.current, | ||
| contentHeight: lastContentHeight.current, | ||
| offset: lastOffset.current, | ||
| onThumbDrag: onThumbDrag, | ||
| } | ||
| ); | ||
| }, | ||
| { root: null } | ||
| ); | ||
|
|
||
| observer.current.observe(findDOMNode(node)); | ||
| } | ||
| }).current; | ||
| }; | ||
|
|
||
| export { | ||
| useScrollbar, | ||
| }; |
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