@uiw/react-md-editor/esm/components/DragBar/index.js

A markdown editor with preview, implemented with React.js and TypeScript.

import React, { useEffect, useMemo, useRef } from 'react';
import "./index.css";
import { jsx as _jsx } from "react/jsx-runtime";
var DragBar = props => {
  var {
    prefixCls,
    onChange
  } = props || {};
  var $dom = useRef(null);
  var dragRef = useRef();
  var heightRef = useRef(props.height);
  useEffect(() => {
    if (heightRef.current !== props.height) {
      heightRef.current = props.height;
    }
  }, [props.height]);
  function handleMouseMove(event) {
    if (dragRef.current) {
      var _changedTouches$;
      var clientY = event.clientY || ((_changedTouches$ = event.changedTouches[0]) == null ? void 0 : _changedTouches$.clientY);
      var newHeight = dragRef.current.height + clientY - dragRef.current.dragY;
      if (newHeight >= props.minHeight && newHeight <= props.maxHeight) {
        onChange && onChange(dragRef.current.height + (clientY - dragRef.current.dragY));
      }
    }
  }
  function handleMouseUp() {
    var _$dom$current, _$dom$current2;
    dragRef.current = undefined;
    document.removeEventListener('mousemove', handleMouseMove);
    document.removeEventListener('mouseup', handleMouseUp);
    (_$dom$current = $dom.current) == null || _$dom$current.removeEventListener('touchmove', handleMouseMove);
    (_$dom$current2 = $dom.current) == null || _$dom$current2.removeEventListener('touchend', handleMouseUp);
  }
  function handleMouseDown(event) {
    var _changedTouches$2, _$dom$current3, _$dom$current4;
    event.preventDefault();
    var clientY = event.clientY || ((_changedTouches$2 = event.changedTouches[0]) == null ? void 0 : _changedTouches$2.clientY);
    dragRef.current = {
      height: heightRef.current,
      dragY: clientY
    };
    document.addEventListener('mousemove', handleMouseMove);
    document.addEventListener('mouseup', handleMouseUp);
    (_$dom$current3 = $dom.current) == null || _$dom$current3.addEventListener('touchmove', handleMouseMove, {
      passive: false
    });
    (_$dom$current4 = $dom.current) == null || _$dom$current4.addEventListener('touchend', handleMouseUp, {
      passive: false
    });
  }
  useEffect(() => {
    if (document) {
      var _$dom$current5, _$dom$current6;
      (_$dom$current5 = $dom.current) == null || _$dom$current5.addEventListener('touchstart', handleMouseDown, {
        passive: false
      });
      (_$dom$current6 = $dom.current) == null || _$dom$current6.addEventListener('mousedown', handleMouseDown);
    }
    return () => {
      if (document) {
        var _$dom$current7;
        (_$dom$current7 = $dom.current) == null || _$dom$current7.removeEventListener('touchstart', handleMouseDown);
        document.removeEventListener('mousemove', handleMouseMove);
      }
    };
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);
  var svg = useMemo(() => /*#__PURE__*/_jsx("svg", {
    viewBox: "0 0 512 512",
    height: "100%",
    children: /*#__PURE__*/_jsx("path", {
      fill: "currentColor",
      d: "M304 256c0 26.5-21.5 48-48 48s-48-21.5-48-48 21.5-48 48-48 48 21.5 48 48zm120-48c-26.5 0-48 21.5-48 48s21.5 48 48 48 48-21.5 48-48-21.5-48-48-48zm-336 0c-26.5 0-48 21.5-48 48s21.5 48 48 48 48-21.5 48-48-21.5-48-48-48z"
    })
  }), []);
  return /*#__PURE__*/_jsx("div", {
    className: prefixCls + "-bar",
    ref: $dom,
    children: svg
  });
};
export default DragBar;