备注：
- 使用
TypeScript和React的函数式组件语法。此组件的目的是显示文本，如果文本内容超出了指定的行数，它将显示一个“查看更多”的按钮。- 当用户点击这个按钮时，将展示全部的文本内容。组件使用了自定义的钩子
useBoundingClientRect来确定是否需要显示这个按钮
//index.tsx文件
import type { FC, JSX } from 'react';
import { Fragment, useState } from 'react';
import type { StandardProps } from '@tarojs/components';
import { Image, Text, View } from '@tarojs/components';import iconDropDown from '@/assets/icons/icon-dorpdown-primary.svg';
import useBoundingClientRect from '@/hooks/useBoundingClientRect';import './index.less';interface EllipsisProps {rows?: number;/*** 收起节点*/foldRender?: JSX.Element;/*** 是否显示收取按钮*/showFold?: boolean;/*** 展开节点*/unfoldRender?: JSX.Element;/*** 是否显示展开按钮*/showUnfold?: boolean;onChange?: (val: boolean) => void;
}const Ellipsis: FC<EllipsisProps & StandardProps> = ({rows = 1,children,className,showUnfold,unfoldRender,
}) => {const [show, setShow] = useState(false);const [rectAssist] = useBoundingClientRect('#rectAssist', [children]);const [rectActual] = useBoundingClientRect('#rectActual', [children]);const style = {lineClamp: rows,webkitLineClamp: rows,};const showMoreBtn =!show &&showUnfold &&rectActual?.height &&rectAssist?.height &&Number(rectActual?.height) !== Number(rectAssist?.height);return (<Fragment><Viewstyle={{ position: 'absolute', left: 0, top: -999999, opacity: 0 }}className={className}id="rectAssist">{children}</View><ViewclassName={`lineClamp__1 ${className}`}style={!show ? style : { display: 'block' }}id="rectActual">{children}{!!showMoreBtn && (<View className="unfold-wrap" id="unfoldWrap" onClick={() => setShow(true)}>{unfoldRender || (<View className="unfold-btn"><Text>查看更多</Text><Image src={iconDropDown} /></View>)}</View>)}</View></Fragment>);
};export default Ellipsis;css样式index.less
.lineClamp(@row) {display: -webkit-box;overflow: hidden;line-clamp: @row;-webkit-line-clamp: @row;-webkit-box-orient: vertical;position: relative;
}.lineClamp__1 {.lineClamp(1);&::after {color: red;position: absolute;right: 0;bottom: 5px;}
}.lineClamp__2 {.lineClamp(2);
}.lineClamp__3 {.lineClamp(3);
}.unfold-wrap {position: absolute;right: 0;bottom: 0;display: flex;background: linear-gradient(to left, #fff, #fff, #fff, rgba(255, 255, 255, 0.4));
}.unfold-btn {display: flex;flex-direction: row;align-items: center;min-width: 32px;padding: 4px 10px 4px 30px;line-height: 1;text {color: #b89962;font-size: 12px;font-style: normal;font-weight: 400;line-height: 12px; /* 100% */}image {width: 13px;height: 12px;}
}使用组件
<View><Ellipsis className={styles.name}>{'未知文字文字文字'}</Ellipsis>
</View>
