PromucFlow_constructor/app/client/src/pages/Editor/WidgetCard.tsx

import React, { useState, useLayoutEffect, MutableRefObject } from "react";
import { useDrag, DragSourceMonitor, DragPreviewImage } from "react-dnd";
import blankImage from "../../assets/images/blank.png";
import { WidgetCardProps } from "../../widgets/BaseWidget";
import styled from "styled-components";
import { generateReactKey } from "../../utils/generators";

type CardProps = {
  details: WidgetCardProps;
};

export const Wrapper = styled.div`
  padding: 10px 5px 10px 5px;
  border-radius: ${props => props.theme.radii[1]}px;
  background: ${props => props.theme.colors.paneCard};
  border: 1px solid ${props => props.theme.colors.paneCard};
  color: ${props => props.theme.colors.textOnDarkBG};
  & > div {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
  }
  &:hover {
    background: #fff;
    cursor: grab;
    color: ${props => props.theme.colors.textDefault};
  }
  & i {
    font-family: ${props => props.theme.fonts[2]};
    font-size: ${props => props.theme.fontSizes[7]}px;
  }
`;

export const IconLabel = styled.h5`
  text-align: center;
  margin: 0;
  text-transform: uppercase;
  font-weight: ${props => props.theme.fontWeights[1]};
  flex-shrink: 1;
  font-size: ${props => props.theme.fontSizes[1]}px;
  line-height: ${props => props.theme.lineHeights[1]}px;
`;

/* eslint-disable @typescript-eslint/no-unused-vars */
const WidgetCard = (props: CardProps) => {
  const [initialOffset, setInitialOffset] = useState({ x: 0, y: 0 });

  const [{ isDragging }, drag, preview] = useDrag({
    item: {
      type: props.details.widgetType,
      widget: props.details,
      key: generateReactKey(),
      initialOffset,
    },
    collect: (monitor: DragSourceMonitor) => ({
      isDragging: monitor.isDragging(),
    }),
  });
  const card: MutableRefObject<HTMLDivElement | null> = React.useRef(null);
  useLayoutEffect(() => {
    const el = card.current;
    if (el) {
      const rect = el.getBoundingClientRect();
      setInitialOffset({
        x: Math.ceil(rect.left),
        y: Math.ceil(rect.top),
      });
    }
  }, [setInitialOffset]);
  return (
    <React.Fragment>
      <DragPreviewImage connect={preview} src={blankImage} />
      <Wrapper ref={drag}>
        <div ref={card}>
          <i className={props.details.icon} />
          <IconLabel>{props.details.label}</IconLabel>
        </div>
      </Wrapper>
    </React.Fragment>
  );
};

export default WidgetCard;