react怎么改变组件大小

<DragBox dragAble={true} minWidth={350} minHeight={184} edgeDistance={[10, 10, 10, 10]} draGCallback={this.dragCallback} >
{}
   <div style={{ top: 100 + 'px', left: 100 + 'px', width: 350, height: 184, backgroundColor: "white" }}>
        <div style={{ backgroundColor: "yellow", width: "100%", height: 30 }}></div>
        <div style={{ backgroundColor: "green", width: "100%", height: 30 }}></div>
        <div style={{ backgroundColor: "blue", width: "100%", height: 30 }}></div>
    </div>
</DragBox>

import React, { Component, Fragment } from 'react';
import styles from "./DragBox.less";

class DragBox extends Component {
    constructor(props) {
        super(props);
        // 父组件盒子
        this.containerRef = React.createRef();
        // 是否开启尺寸修改
        this.reSizeAble = false;
        // 鼠标按下时的坐标，并在修改尺寸时保存上一个鼠标的位置
        this.clientX, this.clientY;
        // 鼠标按下时的位置，使用n、s、w、e表示
        this.direction = "";
        // 拖拽盒子里浏览器上下左右边缘的距离，如果小于这个距离就不会再进行调整宽高
        this.edgeTopDistance = props.edgeDistance[0] || 10;
        this.edgeBottomDistance = props.edgeDistance[1] || 10;
        this.edgeLeftDistance = props.edgeDistance[2] || 10;
        this.edgeRightDistance = props.edgeDistance[3] || 10;
    }
    componentDidMount(){
        // body监听移动事件
        document.body.addEventListener('mousemove', this.move);
        // 鼠标松开事件
        document.body.addEventListener('mouseup', this.up);
    }
    
    clearEventListener() {
        document.body.removeEventListener('mousemove', this.move);
        document.body.removeEventListener('mouseup', this.up);
    }
    componentWillUnmount() {
        this.clearEventListener();
    }
    
    up = () => {
        this.reSizeAble = false;
        this.direction = "";
    }
    
    down = (e, direction) => {
        this.direction = direction;
        this.reSizeAble = true;
        this.clientX = e.clientX;
        this.clientY = e.clientY;
    }
    
    changeLeftAndTop = (event, changeLeft, changeTop, delta) => {
        let ww = document.documentElement.clientWidth;
        let wh = window.innerHeight;
        if (event.clientY < 0 || event.clientX < 0 || event.clientY > wh || event.clientX > ww) {
            return false;
        }
        if (changeLeft) { 
            this.containerRef.current.style.left = Math.max(this.containerRef.current.offsetLeft + delta, this.edgeLeftDistance) + 'px'; 
        }
        if (changeTop) { 
            this.containerRef.current.style.top = Math.max(this.containerRef.current.offsetTop + delta, this.edgeTopDistance) + 'px'; 
        }
    }
    
    move = (e) => {
        // 当开启尺寸修改时，鼠标移动会修改div尺寸
        if (this.reSizeAble) {
            let finalValue;
            // 鼠标按下的位置在上部，修改高度
            if (this.direction === "top") {
                // 1.距离上边缘10 不修改
                // 2.因为按着顶部修改高度会修改top、height，所以需要判断e.clientY是否在offsetTop和this.clientY之间（此时说明处于往上移动且鼠标位置在盒子上边缘之下），不应该移动和调整盒子宽高
                if (e.clientY <= this.edgeTopDistance || (this.containerRef.current.offsetTop < e.clientY && e.clientY  < this.clientY)){ 
                    this.clientY = e.clientY;
                    return; 
                }
                finalValue = Math.max(this.props.minHeight, this.containerRef.current.offsetHeight + (this.clientY - e.clientY));
                // 移动的距离,如果移动的距离不为0需要调整高度和top
                let delta = this.containerRef.current.offsetHeight - finalValue;
                if(delta !== 0){
                    this.changeLeftAndTop(e, false, true, delta); 
                    this.containerRef.current.style.height = finalValue + "px";
                }
                this.clientY = e.clientY;
            } else if (this.direction === "bottom") {// 鼠标按下的位置在底部，修改高度
                // 1.距离下边缘10 不修改
                // 2.判断e.clientY是否处于往下移动且鼠标位置在盒子下边缘之上，不应该调整盒子宽高
                if (window.innerHeight - e.clientY <= this.edgeBottomDistance || (this.containerRef.current.offsetTop + this.containerRef.current.offsetHeight > e.clientY && e.clientY  > this.clientY)) { 
                    this.clientY = e.clientY;
                    return; 
                }
                finalValue = Math.max(this.props.minHeight, this.containerRef.current.offsetHeight + (e.clientY - this.clientY));
                this.containerRef.current.style.height = finalValue + "px";
                this.clientY = e.clientY;
            } else if (this.direction === "right") { // 鼠标按下的位置在右边，修改宽度 
                // 1.距离右边缘10 不修改
                // 2.判断e.clientY是否处于往右移动且鼠标位置在盒子右边缘之左，不应该调整盒子宽高
                if (document.documentElement.clientWidth - e.clientX <= this.edgeRightDistance || (this.containerRef.current.offsetLeft + this.containerRef.current.offsetWidth > e.clientX && e.clientX  > this.clientX)) { 
                    this.clientX = e.clientX;
                    return;
                }
                // 最小为UI设计this.props.minWidth，最大为 改边距离屏幕边缘-10，其他同此
                let value = this.containerRef.current.offsetWidth + (e.clientX - this.clientX);
                finalValue = step(value, this.props.minWidth, document.body.clientWidth - this.edgeRightDistance - this.containerRef.current.offsetLeft);
                this.containerRef.current.style.width = finalValue + "px";
                this.clientX = e.clientX;
            } else if (this.direction === "left") {// 鼠标按下的位置在左边，修改宽度
                // 1.距离左边缘10 不修改
                // 2.因为按着顶部修改高度会修改left、height，所以需要判断e.clientY是否在offsetLeft和this.clientY之间（此时说明处于往左移动且鼠标位置在盒子左边缘之左），不应该移动和调整盒子宽高
                if (e.clientX <= this.edgeLeftDistance || (this.containerRef.current.offsetLeft < e.clientX && e.clientX  < this.clientX)) { 
                    this.clientX = e.clientX;
                    return; 
                }
                let value = this.containerRef.current.offsetWidth + (this.clientX - e.clientX);
                finalValue = step(value, this.props.minWidth, this.containerRef.current.offsetWidth - this.edgeLeftDistance + this.containerRef.current.offsetLeft);
                // 移动的距离,如果移动的距离不为0需要调整宽度和left
                let delta = this.containerRef.current.offsetWidth - finalValue;
                if(delta !== 0){
                    // 需要修改位置，直接修改宽度只会向右增加
                    this.changeLeftAndTop(e, true, false, delta); 
                    this.containerRef.current.style.width = finalValue + "px";
                }
                this.clientX = e.clientX;
            }
            this.props.dragCallback && this.props.dragCallback(this.direction, finalValue);
        }
    }
    render() {
        // 四个红色盒子 用于鼠标移动到上面按下进行拖动
        const children = (
            <Fragment key={"alphaBar"}>
                <div key={1} className={styles.alphaTopBar} onMouseDown={(e) => this.down(e, "top")}></div>
                <div key={2} className={styles.alphaBottomBar} onMouseDown={(e) => this.down(e, "bottom")}></div>
                <div key={3} className={styles.alphaLeftBar} onMouseDown={(e) => this.down(e, "left")}></div>
                <div key={4} className={styles.alphaRightBar} onMouseDown={(e) => this.down(e, "right")}></div>
            </Fragment>
        );
        // 给传进来的children进行加强：添加position:"absolute"，添加四个用于拖动的透明盒子
        const childrenProps = this.props.children.props;
        const cloneReactElement = React.cloneElement(
            this.props.children,
            {
                style: {
                    // 复用原来的样式
                    ...childrenProps.style,
                    // 添加position:"absolute"
                    position: "absolute"
                },
                ref: this.containerRef
            },
            // 复用children,添加四个用于拖动的红色盒子
            [childrenProps.children, children]
        );
        return (
            <Fragment>
                {
                    cloneReactElement
                }
            </Fragment>
        );
    }
}

function step(value, min, max) {
    if (value < min) {
        return min;
    } else if (value > max) {
        return max;
    } else {
        return value;
    }
}
export default DragBox;

  .alphaTopBar{
    position: absolute;
    width: 100%;
    height: 8px;
    top: -5px;
    left: 0;
    background-color: red;
    cursor: row-resize;
  }
  .alphaBottomBar{
    position: absolute;
    width: 100%;
    height: 8px;
    bottom: -5px;
    left: 0;
    background-color: red;
    cursor: row-resize;
  }
  .alphaLeftBar{
    position: absolute;
    width: 8px;
    height: 100%;
    top: 0;
    left: -5px;
    background-color: red;
    cursor: col-resize;
  }
  .alphaRightBar{
    position: absolute;
    width: 8px;
    height: 100%;
    top: 0;
    right: -5px;
    background-color: red;
    cursor: col-resize;
  }