import React, { useState, useRef, useEffect } from 'react';
import ReactDom from 'react-dom';
interface EditTextProps {
  text: string;
  // 告知父組件文案已被修改
  changeText?: (text: string) => void;
}
const EditText = function (props: EditTextProps) {
  useEffect(() => {
    setShowText(props.text);
  }, [props.text]);
  const [showText, setShowText] = useState('');
  const [isBlank, setIsBlank] = useState(false);
  const [isFocus, setIsFocus] = useState(false);
  const textRef = useRef<HTMLDivElement>(null);
  const onFocus = () => {
    setIsFocus(true)
  }
  const onInput = () => {
    // 避免失去焦點(diǎn)的時(shí)候，標(biāo)題區(qū)域明顯的閃動(dòng)
    setIsBlank(!textRef.current?.innerHTML);
  }
  const onBlur = () => {
    const newTitle = textRef.current?.innerHTML || '無(wú)標(biāo)題';
    const oldTitle = props.text;
    setIsFocus(false);
    setIsBlank(false);
    // 文案更新
    if (newTitle !== oldTitle) {
      props?.changeText(newTitle);
      setShowText(getCharsByLength(newTitle, 50));
    }
    else {
      // 文案不更新
      setShowText(getCharsByLength(newTitle, 50));
      if(textRef.current) {
        textRef.current.innerHTML = getCharsByLength(newTitle, 50)
      }
    }
  }
  // 獲取前l(fā)ength個(gè)字符
  const getCharsByLength = (title: string, length: number) => {
    const titleLength = title.length;
    // 假設(shè)都是非中文字符，一個(gè)中文字符的寬度可以顯示兩個(gè)非中文字符
    let maxLength = length * 2;
    const result = [];
    for (let i = 0; i < titleLength; i++) {
      const char = title[i];
      // 中文字符寬度2，非中文字符寬度1
      maxLength -= /[\u4e00-\u9fa5]/.test(char) ? 2 : 1;
      result.push(char);
      if (maxLength <= 0) {
        break;
      }
    }
    if (result.length < titleLength) {
      result.push('...');
    }
    return result.join('');
  };
  return <div className="title">
    {isFocus && isBlank ? <span className="title-blank">無(wú)標(biāo)題</span> : ''}
    <span
      className="title-text"
      contentEditable
      suppressContentEditableWarning
      ref={textRef}
      onFocus={onFocus}
      onInput={onInput}
      onBlur={onBlur}
    >{showText}</span>
  </div>;
};

const onBlur = () => {
    const newTitle = textRef.current?.innerHTML || '無(wú)標(biāo)題';
    const oldTitle = props.text;
    setIsFocus(false);
    setIsBlank(false);
    // 文案更新
    if (newTitle !== oldTitle) {
      props?.changeText(newTitle);
      setShowText(getCharsByLength(newTitle, 50));
    }
    else {
      // 文案不更新
      setShowText('');
      setTimeout(() => {
        setShowText(getCharsByLength(newTitle, 50));
      }, 0)
    }
  }

const onBlur = () => {
    const newTitle = textRef.current?.innerHTML || '無(wú)標(biāo)題';
    const oldTitle = props.text;
    setIsFocus(false);
    setIsBlank(false);
    // 文案更新
    if (newTitle !== oldTitle) {
      props?.changeText(newTitle);
      setShowText(getCharsByLength(newTitle, 50));
    }
    else {
      // 文案不更新
      setShowText(getCharsByLength(newTitle, 50));
      if(textRef.current) {
        textRef.current.innerHTML = getCharsByLength(newTitle, 50)
      }
    }
  }

import React, { useState, useEffect, useRef, useLayoutEffect } from 'react';
interface EditTextProps {
  text: string;
  canEdit?: boolean;
  changeText?: (text: string) => void;
}
function EditText(props: EditTextProps) {
  // 根據(jù)span獲取寬度
  const witdthRef = useRef<HTMLDivElement>(null);
  const [showText, setShowText] = useState('');
  const [isFocus, setIsFocus] = useState(false);
  const [inputWith, setInputWith] = useState(100);
  const minTitleWidth = 70;
  const maxTitleWidth = 500;
  useEffect(() => {
    setShowText(props.text);
  }, [props.text]);
  useLayoutEffect(() => {
    dealInputWidth();
  }, [showText]);
  const dealInputWidth = () => {
    const offsetWidth = witdthRef?.current?.offsetWidth || minTitleWidth;
    // +5 防止出現(xiàn) 截?cái)?
    const width = offsetWidth < maxTitleWidth ? offsetWidth + 5 : maxTitleWidth;
    setInputWith(width);
  };
  const titleFocus = () => {
    setIsFocus(true);
  };
  const titleInput = (e: React.ChangeEvent<HTMLInputElement>) => {
    const newTitle = e.target.value;
    setShowText(newTitle);
  };
  const titleBlur = () => {
    const newTitle = showText || '無(wú)標(biāo)題';
    const oldTitle = props.text;
    setIsFocus(false);
    if (showText !== oldTitle) {
      setShowText(newTitle);
      setIsFocus(false);
      if (props?.changeText) {
        props.changeText(newTitle);
      }
    } else {
      setIsFocus(false);
      setShowText(newTitle);
    }
  };
  return (
      <div className='wrap'>
        {props.canEdit ? (
          <input
            value={showText}
            style={{ width: inputWith }}
            onFocus={titleFocus}
            onChange={titleInput}
            onBlur={titleBlur}
            className='input'
            placeholder="無(wú)標(biāo)題"
          />
        ) : (
          ''
        )}
        {/* 為了計(jì)算文字的寬度 */}
        <span ref={witdthRef} className={props.canEdit ? 'width' : 'text'}>
          {showText}
        </span>
      </div>
  );
}