react/components/shared/backdrop.tsx

import React, { MouseEvent } from 'react'
import useTheme from '../use-theme'
import CssTransition from './css-transition'
import useCurrentState from '../utils/use-current-state'

interface Props {
  onClick?: (event: MouseEvent<HTMLElement>) => void
  visible?: boolean
  width?: string
  onContentClick?: (event: MouseEvent<HTMLElement>) => void
}

const defaultProps = {
  onClick: () => {},
  visible: false,
  onContentClick: () => {},
}

type NativeAttrs = Omit<React.HTMLAttributes<any>, keyof Props>
export type BackdropProps = Props & NativeAttrs

const Backdrop: React.FC<React.PropsWithChildren<BackdropProps>> = React.memo(
  ({
    children,
    onClick,
    visible,
    width,
    onContentClick,
    ...props
  }: React.PropsWithChildren<BackdropProps> & typeof defaultProps) => {
    const theme = useTheme()
    const [, setIsContentMouseDown, IsContentMouseDownRef] = useCurrentState(false)
    const clickHandler = (event: MouseEvent<HTMLElement>) => {
      if (IsContentMouseDownRef.current) return
      onClick && onClick(event)
    }
    const mouseUpHandler = () => {
      if (!IsContentMouseDownRef.current) return
      const timer = setTimeout(() => {
        setIsContentMouseDown(false)
        clearTimeout(timer)
      }, 0)
    }

    return (
      <CssTransition name="backdrop-wrapper" visible={visible} clearTime={300}>
        <div
          className="backdrop"
          onClick={clickHandler}
          onMouseUp={mouseUpHandler}
          {...props}>
          <div className="layer" />
          <div
            onClick={onContentClick}
            className="content"
            onMouseDown={() => setIsContentMouseDown(true)}>
            {children}
          </div>
          <style jsx>{`
            .backdrop {
              position: fixed;
              top: 0;
              left: 0;
              right: 0;
              bottom: 0;
              overflow: auto;
              z-index: 1000;
              -webkit-overflow-scrolling: touch;
              box-sizing: border-box;
              text-align: center;
            }

            .content {
              position: relative;
              z-index: 1001;
              outline: none;
              max-width: 90%;
              width: ${width};
              margin: 20px auto;
              vertical-align: middle;
              display: inline-block;
            }

            .backdrop:before {
              display: inline-block;
              width: 0;
              height: 100%;
              vertical-align: middle;
              content: '';
            }

            .layer {
              position: fixed;
              top: 0;
              left: 0;
              right: 0;
              bottom: 0;
              width: 100%;
              height: 100%;
              opacity: ${theme.expressiveness.portalOpacity};
              background-color: black;
              transition: opacity 0.35s cubic-bezier(0.4, 0, 0.2, 1);
              pointer-events: none;
              z-index: 1000;
            }

            .backdrop-wrapper-enter .layer {
              opacity: 0;
            }

            .backdrop-wrapper-enter-active .layer {
              opacity: ${theme.expressiveness.portalOpacity};
            }

            .backdrop-wrapper-leave .layer {
              opacity: ${theme.expressiveness.portalOpacity};
            }

            .backdrop-wrapper-leave-active .layer {
              opacity: 0;
            }
          `}</style>
        </div>
      </CssTransition>
    )
  },
)

Backdrop.defaultProps = defaultProps
Backdrop.displayName = 'GeistBackdrop'
export default Backdrop