@material-ui/core/es/Grow/Grow.js

React components that implement Google's Material Design.

import _extends from "@babel/runtime/helpers/esm/extends";
import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
import React from 'react';
import PropTypes from 'prop-types';
import { Transition } from 'react-transition-group';
import useTheme from '../styles/useTheme';
import { reflow, getTransitionProps } from '../transitions/utils';
import useForkRef from '../utils/useForkRef';

function getScale(value) {
  return `scale(${value}, ${value ** 2})`;
}

const styles = {
  entering: {
    opacity: 1,
    transform: getScale(1)
  },
  entered: {
    opacity: 1,
    transform: 'none'
  }
};
/**
 * The Grow transition is used by the [Tooltip](/components/tooltips/) and
 * [Popover](/components/popover/) components.
 * It uses [react-transition-group](https://github.com/reactjs/react-transition-group) internally.
 */

const Grow = React.forwardRef(function Grow(props, ref) {
  const {
    children,
    in: inProp,
    onEnter,
    onExit,
    style,
    timeout = 'auto'
  } = props,
        other = _objectWithoutPropertiesLoose(props, ["children", "in", "onEnter", "onExit", "style", "timeout"]);

  const timer = React.useRef();
  const autoTimeout = React.useRef();
  const handleRef = useForkRef(children.ref, ref);
  const theme = useTheme();

  const handleEnter = (node, isAppearing) => {
    reflow(node); // So the animation always start from the start.

    const {
      duration: transitionDuration,
      delay
    } = getTransitionProps({
      style,
      timeout
    }, {
      mode: 'enter'
    });
    let duration;

    if (timeout === 'auto') {
      duration = theme.transitions.getAutoHeightDuration(node.clientHeight);
      autoTimeout.current = duration;
    } else {
      duration = transitionDuration;
    }

    node.style.transition = [theme.transitions.create('opacity', {
      duration,
      delay
    }), theme.transitions.create('transform', {
      duration: duration * 0.666,
      delay
    })].join(',');

    if (onEnter) {
      onEnter(node, isAppearing);
    }
  };

  const handleExit = node => {
    const {
      duration: transitionDuration,
      delay
    } = getTransitionProps({
      style,
      timeout
    }, {
      mode: 'exit'
    });
    let duration;

    if (timeout === 'auto') {
      duration = theme.transitions.getAutoHeightDuration(node.clientHeight);
      autoTimeout.current = duration;
    } else {
      duration = transitionDuration;
    }

    node.style.transition = [theme.transitions.create('opacity', {
      duration,
      delay
    }), theme.transitions.create('transform', {
      duration: duration * 0.666,
      delay: delay || duration * 0.333
    })].join(',');
    node.style.opacity = '0';
    node.style.transform = getScale(0.75);

    if (onExit) {
      onExit(node);
    }
  };

  const addEndListener = (_, next) => {
    if (timeout === 'auto') {
      timer.current = setTimeout(next, autoTimeout.current || 0);
    }
  };

  React.useEffect(() => {
    return () => {
      clearTimeout(timer.current);
    };
  }, []);
  return React.createElement(Transition, _extends({
    appear: true,
    in: inProp,
    onEnter: handleEnter,
    onExit: handleExit,
    addEndListener: addEndListener,
    timeout: timeout === 'auto' ? null : timeout
  }, other), (state, childProps) => {
    return React.cloneElement(children, _extends({
      style: _extends({
        opacity: 0,
        transform: getScale(0.75),
        visibility: state === 'exited' && !inProp ? 'hidden' : undefined
      }, styles[state], {}, style, {}, children.props.style),
      ref: handleRef
    }, childProps));
  });
});
process.env.NODE_ENV !== "production" ? Grow.propTypes = {
  /**
   * A single child content element.
   */
  children: PropTypes.element,

  /**
   * If `true`, show the component; triggers the enter or exit animation.
   */
  in: PropTypes.bool,

  /**
   * @ignore
   */
  onEnter: PropTypes.func,

  /**
   * @ignore
   */
  onExit: PropTypes.func,

  /**
   * @ignore
   */
  style: PropTypes.object,

  /**
   * The duration for the transition, in milliseconds.
   * You may specify a single timeout for all transitions, or individually with an object.
   *
   * Set to 'auto' to automatically calculate transition time based on height.
   */
  timeout: PropTypes.oneOfType([PropTypes.number, PropTypes.shape({
    enter: PropTypes.number,
    exit: PropTypes.number
  }), PropTypes.oneOf(['auto'])])
} : void 0;
Grow.muiSupportAuto = true;
export default Grow;