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real-time-fund/app/components/FitText.jsx
2026-03-01 16:49:46 +08:00

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'use client';
import { useLayoutEffect, useRef } from 'react';
/**
* 根据容器宽度动态缩小字体,使内容不溢出。
* 使用 ResizeObserver 监听容器宽度,内容超出时按比例缩小 fontSize不低于 minFontSize。
*
* @param {Object} props
* @param {React.ReactNode} props.children - 要显示的文本(会单行、不换行)
* @param {number} [props.maxFontSize=14] - 最大字号px
* @param {number} [props.minFontSize=10] - 最小字号px再窄也不低于此值
* @param {string} [props.className] - 外层容器 className
* @param {Object} [props.style] - 外层容器 style宽度由父级决定建议父级有明确宽度
* @param {string} [props.as='span'] - 外层容器标签 'span' | 'div'
*/
export default function FitText({
children,
maxFontSize = 14,
minFontSize = 10,
className,
style = {},
as: Tag = 'span',
}) {
const containerRef = useRef(null);
const contentRef = useRef(null);
const adjust = () => {
const container = containerRef.current;
const content = contentRef.current;
if (!container || !content) return;
const containerWidth = container.clientWidth;
if (containerWidth <= 0) return;
// 先恢复到最大字号再测量,确保在「未缩放」状态下取到真实内容宽度
content.style.fontSize = `${maxFontSize}px`;
const run = () => {
const contentWidth = content.scrollWidth;
if (contentWidth <= 0) return;
let size = maxFontSize;
if (contentWidth > containerWidth) {
size = (containerWidth / contentWidth) * maxFontSize;
size = Math.max(minFontSize, Math.min(maxFontSize, size));
}
content.style.fontSize = `${size}px`;
};
requestAnimationFrame(run);
};
useLayoutEffect(() => {
const container = containerRef.current;
if (!container) return;
adjust();
const ro = new ResizeObserver(adjust);
ro.observe(container);
return () => ro.disconnect();
}, [children, maxFontSize, minFontSize]);
return (
<Tag
ref={containerRef}
className={className}
style={{
display: 'block',
width: '100%',
overflow: 'hidden',
...style,
}}
>
<span
ref={contentRef}
style={{
display: 'inline-block',
whiteSpace: 'nowrap',
fontWeight: 'inherit',
fontSize: `${maxFontSize}px`,
}}
>
{children}
</span>
</Tag>
);
}