text: import _extends from "@babel/runtime/helpers/esm/extends";
  import _toArray from "@babel/runtime/helpers/esm/toArray";
  import _slicedToArray from "@babel/runtime/helpers/esm/slicedToArray";
  import _objectWithoutProperties from "@babel/runtime/helpers/esm/objectWithoutProperties";
  import * as React from 'react';
  import { isFragment } from 'react-is';
  import PropTypes from 'prop-types';
  import clsx from 'clsx';
  import { chainPropTypes } from '@material-ui/utils';
  import Collapse from '../Collapse';
  import Paper from '../Paper';
  import withStyles from '../styles/withStyles';
  import ExpansionPanelContext from './ExpansionPanelContext';
  import useControlled from '../utils/useControlled';
  export var styles = function styles(theme) {
    var transition = {
      duration: theme.transitions.duration.shortest
    };
    return {
      /* Styles applied to the root element. */
      root: {
        position: 'relative',
        transition: theme.transitions.create(['margin'], transition),
        '&:before': {
          position: 'absolute',
          left: 0,
          top: -1,
          right: 0,
          height: 1,
          content: '""',
          opacity: 1,
          backgroundColor: theme.palette.divider,
          transition: theme.transitions.create(['opacity', 'background-color'], transition)
        },
        '&:first-child': {
          '&:before': {
            display: 'none'
          }
        },
        '&$expanded': {
          margin: '16px 0',
          '&:first-child': {
            marginTop: 0
          },
          '&:last-child': {
            marginBottom: 0
          },
          '&:before': {
            opacity: 0
          }
        },
        '&$expanded + &': {
          '&:before': {
            display: 'none'
          }
        },
        '&$disabled': {
          backgroundColor: theme.palette.action.disabledBackground
        }
      },
  
      /* Styles applied to the root element if `square={false}`. */
      rounded: {
        borderRadius: 0,
        '&:first-child': {
          borderTopLeftRadius: theme.shape.borderRadius,
          borderTopRightRadius: theme.shape.borderRadius
        },
        '&:last-child': {
          borderBottomLeftRadius: theme.shape.borderRadius,
          borderBottomRightRadius: theme.shape.borderRadius,
          // Fix a rendering issue on Edge
          '@supports (-ms-ime-align: auto)': {
            borderBottomLeftRadius: 0,
            borderBottomRightRadius: 0
          }
        }
      },
  
      /* Styles applied to the root element if `expanded={true}`. */
      expanded: {},
  
      /* Styles applied to the root element if `disabled={true}`. */
      disabled: {}
    };
  };
  var ExpansionPanel = React.forwardRef(function ExpansionPanel(props, ref) {
    var childrenProp = props.children,
        classes = props.classes,
        className = props.className,
        _props$defaultExpande = props.defaultExpanded,
        defaultExpanded = _props$defaultExpande === void 0 ? false : _props$defaultExpande,
        _props$disabled = props.disabled,
        disabled = _props$disabled === void 0 ? false : _props$disabled,
        expandedProp = props.expanded,
        onChange = props.onChange,
        _props$square = props.square,
        square = _props$square === void 0 ? false : _props$square,
        _props$TransitionComp = props.TransitionComponent,
        TransitionComponent = _props$TransitionComp === void 0 ? Collapse : _props$TransitionComp,
        TransitionProps = props.TransitionProps,
        other = _objectWithoutProperties(props, ["children", "classes", "className", "defaultExpanded", "disabled", "expanded", "onChange", "square", "TransitionComponent", "TransitionProps"]);
  
    var _useControlled = useControlled({
      controlled: expandedProp,
      default: defaultExpanded,
      name: 'ExpansionPanel'
    }),
        _useControlled2 = _slicedToArray(_useControlled, 2),
        expanded = _useControlled2[0],
        setExpandedState = _useControlled2[1];
  
    var handleChange = React.useCallback(function (event) {
      setExpandedState(!expanded);
  
      if (onChange) {
        onChange(event, !expanded);
      }
    }, [expanded, onChange, setExpandedState]);
  
    var _React$Children$toArr = React.Children.toArray(childrenProp),
        _React$Children$toArr2 = _toArray(_React$Children$toArr),
        summary = _React$Children$toArr2[0],
        children = _React$Children$toArr2.slice(1);
  
    var contextValue = React.useMemo(function () {
      return {
        expanded: expanded,
        disabled: disabled,
        toggle: handleChange
      };
    }, [expanded, disabled, handleChange]);
    return /*#__PURE__*/React.createElement(Paper, _extends({
      className: clsx(classes.root, className, expanded && classes.expanded, disabled && classes.disabled, !square && classes.rounded),
      ref: ref,
      square: square
    }, other), /*#__PURE__*/React.createElement(ExpansionPanelContext.Provider, {
      value: contextValue
    }, summary), /*#__PURE__*/React.createElement(TransitionComponent, _extends({
      in: expanded,
      timeout: "auto"
    }, TransitionProps), /*#__PURE__*/React.createElement("div", {
      "aria-labelledby": summary.props.id,
      id: summary.props['aria-controls'],
      role: "region"
    }, children)));
  });
  process.env.NODE_ENV !== "production" ? ExpansionPanel.propTypes = {
    /**
     * The content of the expansion panel.
     */
    children: chainPropTypes(PropTypes.node.isRequired, function (props) {
      var summary = React.Children.toArray(props.children)[0];
  
      if (isFragment(summary)) {
        return new Error("Material-UI: the ExpansionPanel doesn't accept a Fragment as a child. " + 'Consider providing an array instead.');
      }
  
      if (!React.isValidElement(summary)) {
        return new Error('Material-UI: expected the first child of ExpansionPanel to be a valid element.');
      }
  
      return null;
    }),
  
    /**
     * Override or extend the styles applied to the component.
     * See [CSS API](#css) below for more details.
     */
    classes: PropTypes.object.isRequired,
  
    /**
     * @ignore
     */
    className: PropTypes.string,
  
    /**
     * If `true`, expands the panel by default.
     */
    defaultExpanded: PropTypes.bool,
  
    /**
     * If `true`, the panel will be displayed in a disabled state.
     */
    disabled: PropTypes.bool,
  
    /**
     * If `true`, expands the panel, otherwise collapse it.
     * Setting this prop enables control over the panel.
     */
    expanded: PropTypes.bool,
  
    /**
     * Callback fired when the expand/collapse state is changed.
     *
     * @param {object} event The event source of the callback.
     * @param {boolean} expanded The `expanded` state of the panel.
     */
    onChange: PropTypes.func,
  
    /**
     * @ignore
     */
    square: PropTypes.bool,
  
    /**
     * The component used for the collapse effect.
     * [Follow this guide](/components/transitions/#transitioncomponent-prop) to learn more about the requirements for this component.
     */
    TransitionComponent: PropTypes.elementType,
  
    /**
     * Props applied to the [`Transition`](http://reactcommunity.org/react-transition-group/transition#Transition-props) element.
     */
    TransitionProps: PropTypes.object
  } : void 0;
  export default withStyles(styles, {
    name: 'MuiExpansionPanel'
  })(ExpansionPanel);