jjb-lc-designable/react/containers/Viewport.js

基于alibaba-designable源码二次封装的表单设计器。

function _extends() { _extends = Object.assign ? Object.assign.bind() : function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
import React, { useLayoutEffect, useRef, useState } from 'react';
import { usePrefix, useViewport } from '../hooks';
import { AuxToolWidget, EmptyWidget } from '../widgets';
import { requestIdle, globalThisPolyfill } from 'jjb-lc-designable/shared';
import cls from 'classnames';
export const Viewport = ({
  placeholder,
  dragTipsDirection,
  ...props
}) => {
  const [loaded, setLoaded] = useState(false);
  const prefix = usePrefix('viewport');
  const viewport = useViewport();
  const ref = useRef();
  const viewportRef = useRef();
  const isFrameRef = useRef(false);
  useLayoutEffect(() => {
    const frameElement = ref.current.querySelector('iframe');
    if (!viewport) return;
    if (viewportRef.current && viewportRef.current !== viewport) {
      viewportRef.current.onUnmount();
    }
    if (frameElement) {
      frameElement.addEventListener('load', () => {
        viewport.onMount(frameElement, frameElement.contentWindow);
        requestIdle(() => {
          isFrameRef.current = true;
          setLoaded(true);
        });
      });
    } else {
      viewport.onMount(ref.current, globalThisPolyfill);
      requestIdle(() => {
        isFrameRef.current = false;
        setLoaded(true);
      });
    }
    viewportRef.current = viewport;
    return () => {
      viewport.onUnmount();
    };
  }, [viewport]);
  return /*#__PURE__*/React.createElement("div", _extends({}, props, {
    ref: ref,
    className: cls(prefix, props.className),
    style: {
      opacity: !loaded ? 0 : 1,
      overflow: isFrameRef.current ? 'hidden' : 'overlay',
      ...props.style
    }
  }), props.children, /*#__PURE__*/React.createElement(AuxToolWidget, null), /*#__PURE__*/React.createElement(EmptyWidget, {
    dragTipsDirection: dragTipsDirection
  }, placeholder));
};