ahooks/es/useTextSelection/index.js

react hooks library

import { __assign, __read } from "tslib";
import { useRef, useState } from 'react';
import { getTargetElement } from '../utils/domTarget';
import useEffectWithTarget from '../utils/useEffectWithTarget';
var initRect = {
  top: NaN,
  left: NaN,
  bottom: NaN,
  right: NaN,
  height: NaN,
  width: NaN
};
var initState = __assign({
  text: ''
}, initRect);
function getRectFromSelection(selection) {
  if (!selection) {
    return initRect;
  }
  if (selection.rangeCount < 1) {
    return initRect;
  }
  var range = selection.getRangeAt(0);
  var _a = range.getBoundingClientRect(),
    height = _a.height,
    width = _a.width,
    top = _a.top,
    left = _a.left,
    right = _a.right,
    bottom = _a.bottom;
  return {
    height: height,
    width: width,
    top: top,
    left: left,
    right: right,
    bottom: bottom
  };
}
function useTextSelection(target) {
  var _a = __read(useState(initState), 2),
    state = _a[0],
    setState = _a[1];
  var stateRef = useRef(state);
  var isInRangeRef = useRef(false);
  stateRef.current = state;
  useEffectWithTarget(function () {
    var el = getTargetElement(target, document);
    if (!el) {
      return;
    }
    var mouseupHandler = function () {
      var selObj = null;
      var text = '';
      var rect = initRect;
      if (!window.getSelection) return;
      selObj = window.getSelection();
      text = selObj ? selObj.toString() : '';
      if (text && isInRangeRef.current) {
        rect = getRectFromSelection(selObj);
        setState(__assign(__assign(__assign({}, state), {
          text: text
        }), rect));
      }
    };
    // 任意点击都需要清空之前的 range
    var mousedownHandler = function (e) {
      if (!window.getSelection) return;
      if (stateRef.current.text) {
        setState(__assign({}, initState));
      }
      isInRangeRef.current = false;
      var selObj = window.getSelection();
      if (!selObj) return;
      selObj.removeAllRanges();
      isInRangeRef.current = el.contains(e.target);
    };
    el.addEventListener('mouseup', mouseupHandler);
    document.addEventListener('mousedown', mousedownHandler);
    return function () {
      el.removeEventListener('mouseup', mouseupHandler);
      document.removeEventListener('mousedown', mousedownHandler);
    };
  }, [], target);
  return state;
}
export default useTextSelection;