react自动放缩组件

# react自动放缩组件

背景：公司有一个大屏展示的项目（1920*1080），该项目被多个产品以iframe的形式内嵌，有时候会出现布局混乱。所以需要做一个外部的壳子，根据外部穿进来的宽度，等比放缩该大屏项目，所以做了该功能。

# 代码

{% raw %}

// index.tsx

import React, { useEffect } from 'react';
import './index.scss';
import { useImmer } from 'use-immer';
import { Props, ScaleBoxState } from './interface';

const ScaleBox = function (props: Props) {
  const { width = 1920, height = 1080, children, monitorScaleChange, outsideWidth = 0, outsideHeight=0 } = props;
  const [state, updateState] = useImmer<ScaleBoxState>({
    scale: 1,
    wrapWidth: null,
    wrapHeight: null,
  });

  useEffect(() => {
    init();
    return () => {
      window.onresize = null
    }
  }, []);

  useEffect(() => {
    setScale();
  }, [window.innerWidth + window.innerHeight]);

  const getScale = () => {
    const currentWrapWidth =  window.innerWidth - outsideWidth;
    const currentWrapHeight = window.innerHeight - outsideHeight;
    let ww = currentWrapWidth / width;
    let wh = currentWrapHeight / height;
    updateState((draft) => {
      draft.wrapWidth = currentWrapWidth;
      draft.wrapHeight = currentWrapHeight;
    })
    return Math.min(ww, wh);
  }

  const setScale = () => {
    const scale = getScale();
    monitorScaleChange(scale);
    updateState((draft) => {
      draft.scale = scale;
    });
  }


  const debounce: Function = (fn: Function, delay: number = 500): Function => {
    let timer: any
    return function () {
      let args = arguments;
      if (timer) {
        clearTimeout(timer);
      }
      timer = setTimeout(function () {
        timer = null;
        fn(args);
      }, delay);
    }
  }

  const init = () => {
    if (state.wrapWidth === null && state.wrapHeight === null) {
      window.onresize = debounce(setScale);
    }
  }

  return (
    <div className="scale-box-wrap">
      <div className="scale-box" style={{width: `${width}px`, height: `${height}px`, transform: `scale(${state.scale}) translate(-50%, -50%)`}} >
        {
          children
        }
      </div>
    </div>
  );
};

export default ScaleBox;

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{% endraw %}

// interface.ts

export interface Props {
  width?: number;
  height?: number;
  wrapWidth?: number;
  wrapHeight?: number;
  children?: any;
  monitorScaleChange?: Function;
  outsideWidth?: number;
  outsideHeight?: number;
}

export interface ScaleBoxState {
  scale: number;
  wrapWidth: number;
  wrapHeight: number;
  // tabDom: HTMLElement[];
  // barWidth: number;
  // barLeft: number;
  // isClose: boolean;
}

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// index.less

.scale-box-wrap {
  background-color: #000000;
  width: 100%;
  height: 100%;
}
.scale-box {
  display: flex;
  flex-direction: column;
  transform-origin: 0 0;
  position: absolute;
  left: 50%;
  top: 50%;
  transition: 0.3s;
}

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编辑

上次更新: 2025/04/18, 01:42:12

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