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feat: Only render visible frames, avoid extra history entries (#106)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,35 +1,69 @@ | ||
| import React, { Component, AllHTMLAttributes } from 'react'; | ||
| import React, { | ||
| useState, | ||
| useEffect, | ||
| useRef, | ||
| AllHTMLAttributes, | ||
| MutableRefObject | ||
| } from 'react'; | ||
| import { useIntersection } from 'react-use'; | ||
|
|
||
| interface State { | ||
| loaded: boolean; | ||
| interface IframeProps extends AllHTMLAttributes<HTMLIFrameElement> { | ||
| src: string; | ||
| intersectionRootRef: MutableRefObject<Element | null>; | ||
| } | ||
| interface Props extends AllHTMLAttributes<HTMLIFrameElement> {} | ||
|
|
||
| export default class Iframe extends Component<Props, State> { | ||
| constructor(props: Props) { | ||
| super(props); | ||
|
|
||
| this.state = { | ||
| loaded: false | ||
| }; | ||
| } | ||
|
|
||
| handleLoad = () => { | ||
| this.setState({ loaded: true }); | ||
| }; | ||
|
|
||
| render() { | ||
| const { style, ...props } = this.props; | ||
| const { loaded } = this.state; | ||
|
|
||
| const combinedStyles = { | ||
| ...style, | ||
| transition: 'opacity .3s ease', | ||
| opacity: loaded ? 1 : 0 | ||
| }; | ||
|
|
||
| return ( | ||
| <iframe onLoad={this.handleLoad} {...props} style={combinedStyles} /> | ||
| ); | ||
| } | ||
|
|
||
| export default function Iframe({ | ||
| intersectionRootRef, | ||
| style, | ||
| src, | ||
| ...restProps | ||
| }: IframeProps) { | ||
| const [loaded, setLoaded] = useState(false); | ||
| const [renderedSrc, setRenderedSrc] = useState<string | null>(null); | ||
| const iframeRef = useRef<HTMLIFrameElement | null>(null); | ||
| const intersection = useIntersection(iframeRef, { | ||
| root: intersectionRootRef.current, | ||
| rootMargin: '800px', | ||
| threshold: 0 | ||
| }); | ||
|
|
||
| const intersectionRatio = intersection?.intersectionRatio ?? null; | ||
|
|
||
| useEffect(() => { | ||
| if (intersectionRatio === null) { | ||
| return; | ||
| } | ||
|
|
||
| if (intersectionRatio > 0 && src !== renderedSrc) { | ||
| setRenderedSrc(src); | ||
| } | ||
| }, [intersectionRatio, src, renderedSrc]); | ||
|
|
||
| useEffect(() => { | ||
| if (renderedSrc !== null) { | ||
| const location = iframeRef.current?.contentWindow?.location; | ||
|
|
||
| if (location) { | ||
| location.replace(renderedSrc); | ||
| } | ||
| } | ||
| }, [renderedSrc]); | ||
|
|
||
| return ( | ||
| <iframe | ||
| ref={iframeRef} | ||
| onLoad={() => setLoaded(true)} | ||
| onMouseEnter={() => { | ||
| if (src !== renderedSrc) { | ||
| setRenderedSrc(src); | ||
| } | ||
| }} | ||
| style={{ | ||
| ...style, | ||
| transition: 'opacity .3s ease', | ||
| opacity: loaded ? 1 : 0 | ||
| }} | ||
| {...restProps} | ||
| /> | ||
| ); | ||
| } |
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