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

React components that implement Google's Material Design.

import _extends from "@babel/runtime/helpers/extends";
import _objectWithoutProperties from "@babel/runtime/helpers/objectWithoutProperties";
import _objectSpread from "@babel/runtime/helpers/objectSpread";
// @inheritedComponent Paper
import React from 'react';
import PropTypes from 'prop-types';
import classNames from 'classnames';
import warning from 'warning';
import Collapse from '../Collapse';
import Paper from '../Paper';
import withStyles from '../styles/withStyles';
import { isMuiElement } from '../utils/reactHelpers'; // Workaround https://github.com/jsdom/jsdom/issues/2026

const edgeFix = typeof window !== 'undefined' && /jsdom/.test(window.navigator.userAgent) ? {} : {
  // Fix a rendering issue on Edge
  '@supports (-ms-ime-align: auto)': {
    borderBottomLeftRadius: 0,
    borderBottomRightRadius: 0
  }
};
export const styles = theme => {
  const 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': {
        borderTopLeftRadius: 2,
        borderTopRightRadius: 2,
        '&:before': {
          display: 'none'
        }
      },
      '&:last-child': _objectSpread({
        borderBottomLeftRadius: 2,
        borderBottomRightRadius: 2
      }, edgeFix),
      '&$expanded + &': {
        '&:before': {
          display: 'none'
        }
      }
    },

    /* Styles applied to the root element if `expanded={true}`. */
    expanded: {
      margin: '16px 0',
      '&:first-child': {
        marginTop: 0
      },
      '&:last-child': {
        marginBottom: 0
      },
      '&:before': {
        opacity: 0
      }
    },

    /* Styles applied to the root element if `disabled={true}`. */
    disabled: {
      backgroundColor: theme.palette.action.disabledBackground
    }
  };
};

class ExpansionPanel extends React.Component {
  constructor(props) {
    super();

    this.handleChange = event => {
      const expanded = this.isControlled ? this.props.expanded : this.state.expanded;

      if (!this.isControlled) {
        this.setState({
          expanded: !expanded
        });
      }

      if (this.props.onChange) {
        this.props.onChange(event, !expanded);
      }
    };

    this.isControlled = props.expanded != null;
    this.state = {};

    if (!this.isControlled) {
      // not controlled, use internal state
      this.state.expanded = props.defaultExpanded !== undefined ? props.defaultExpanded : false;
    }
  }

  render() {
    const _this$props = this.props,
          {
      children: childrenProp,
      classes,
      className: classNameProp,
      CollapseProps: CollapsePropsProp,
      defaultExpanded,
      disabled,
      expanded: expandedProp,
      onChange
    } = _this$props,
          other = _objectWithoutProperties(_this$props, ["children", "classes", "className", "CollapseProps", "defaultExpanded", "disabled", "expanded", "onChange"]);

    const expanded = this.isControlled ? expandedProp : this.state.expanded;
    const className = classNames(classes.root, {
      [classes.expanded]: expanded,
      [classes.disabled]: disabled
    }, classNameProp);
    let summary = null;
    const children = React.Children.map(childrenProp, child => {
      if (!React.isValidElement(child)) {
        return null;
      }

      process.env.NODE_ENV !== "production" ? warning(child.type !== React.Fragment, ["Material-UI: the ExpansionPanel component doesn't accept a Fragment as a child.", 'Consider providing an array instead.'].join('\n')) : void 0;

      if (isMuiElement(child, ['ExpansionPanelSummary'])) {
        summary = React.cloneElement(child, {
          disabled,
          expanded,
          onChange: this.handleChange
        });
        return null;
      }

      return child;
    });
    const CollapseProps = !expanded ? {
      'aria-hidden': 'true'
    } : null;
    return React.createElement(Paper, _extends({
      className: className,
      elevation: 1,
      square: true
    }, other), summary, React.createElement(Collapse, _extends({
      in: expanded,
      timeout: "auto"
    }, CollapseProps, CollapsePropsProp), children));
  }

}

ExpansionPanel.propTypes = process.env.NODE_ENV !== "production" ? {
  /**
   * The content of the expansion panel.
   */
  children: PropTypes.node.isRequired,

  /**
   * Override or extend the styles applied to the component.
   * See [CSS API](#css-api) below for more details.
   */
  classes: PropTypes.object.isRequired,

  /**
   * @ignore
   */
  className: PropTypes.string,

  /**
   * Properties applied to the [`Collapse`](/api/collapse/) element.
   */
  CollapseProps: PropTypes.object,

  /**
   * 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
} : {};
ExpansionPanel.defaultProps = {
  defaultExpanded: false,
  disabled: false
};
export default withStyles(styles, {
  name: 'MuiExpansionPanel'
})(ExpansionPanel);