react中封装组件对三方库或者已有ui组件进行自动调整大小嵌入显示区域

原因：有些三方库的组件或者已有的组件ui部分无法调整大小，比如组件是全屏覆盖显示但是在新开发的迭代要求缩小到部分区域显示

解决方法：使用css的属性transform scale,通过绝对定位处理放大或者缩小的处理区域

ini 复制代码

import React, {
  FC, useEffect, useRef, useState,
} from 'react';
import { useSize } from 'ahooks';
import { isEmpty, min } from 'lodash';
import { css } from '@emotion/css';

interface Props {
  debug?: boolean
  lockMaxWidth?: boolean
  lockMaxHeight?: boolean
}

export const AutoScale: FC<React.PropsWithChildren & Props> = ({ children, debug, lockMaxHeight = true, lockMaxWidth = true }) => {
  const outsideWrapperRef = useRef<HTMLDivElement>(null);
  const insideWrapperRef = useRef<HTMLDivElement>(null);
  const outsideSize = useSize(outsideWrapperRef.current?.parentElement);
  const insideSize = useSize(insideWrapperRef);
  const [scale, setScale] = useState(1);
  const [height, setHeight] = useState(0);
  const [width, setWidth] = useState(0);

  useEffect(() => {
    if (isEmpty(insideSize) || isEmpty(outsideSize)) {
      return;
    }
    if (debug) {
      console.log(outsideSize);
    }

    const scaleWidth = outsideSize.width / insideSize.width;
    const scaleHeight = outsideSize.height / insideSize.height;
    let resultScale;

    switch (true) {
      case lockMaxWidth && !lockMaxHeight:
        resultScale = scaleWidth;
        break;
      case !lockMaxWidth && lockMaxHeight:
        resultScale = scaleHeight;
        break;
      case lockMaxWidth && lockMaxHeight:
        resultScale = min([scaleWidth, scaleHeight]);
        break;
      default:
        resultScale = scaleWidth;
        break;
    }

    setScale(resultScale);
    setHeight(insideSize.height * resultScale);
    setWidth(insideSize.width * resultScale);
  }, [insideSize, outsideSize]);

  return (
    <div
      ref={outsideWrapperRef}
      className={css`
          position: relative;
          width: ${`${width}px` || '100%'};
          height: ${`${height}px` || '100%'};
          overflow: ${width ? 'initial' : 'hidden'};
      `}
    >
      <div
        ref={insideWrapperRef}
        className={css`
          position: absolute;
          top: 0;
          left: 0;
          transform-origin: left top;
          transform: scale(${scale});
      `}
      >
        {children}
      </div>
    </div>
  );
};