@wordpress/components/build-module/panel/body.js

UI components for WordPress.

import _extends from "@babel/runtime/helpers/esm/extends";
import { createElement } from "@wordpress/element";

/**
 * External dependencies
 */
import classnames from 'classnames';
/**
 * WordPress dependencies
 */

import { useReducedMotion, useMergeRefs } from '@wordpress/compose';
import { forwardRef, useRef } from '@wordpress/element';
import { chevronUp, chevronDown } from '@wordpress/icons';
/**
 * Internal dependencies
 */

import Button from '../button';
import Icon from '../icon';
import { useControlledState, useUpdateEffect } from '../utils';

const noop = () => {};

export function UnforwardedPanelBody(props, ref) {
  const {
    buttonProps = {},
    children,
    className,
    icon,
    initialOpen,
    onToggle = noop,
    opened,
    title,
    scrollAfterOpen = true
  } = props;
  const [isOpened, setIsOpened] = useControlledState(opened, {
    initial: initialOpen === undefined ? true : initialOpen,
    fallback: false
  });
  const nodeRef = useRef(null); // Defaults to 'smooth' scrolling
  // https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollIntoView

  const scrollBehavior = useReducedMotion() ? 'auto' : 'smooth';

  const handleOnToggle = event => {
    event.preventDefault();
    const next = !isOpened;
    setIsOpened(next);
    onToggle(next);
  }; // Ref is used so that the effect does not re-run upon scrollAfterOpen changing value.


  const scrollAfterOpenRef = useRef();
  scrollAfterOpenRef.current = scrollAfterOpen; // Runs after initial render.

  useUpdateEffect(() => {
    var _nodeRef$current;

    if (isOpened && scrollAfterOpenRef.current && (_nodeRef$current = nodeRef.current) !== null && _nodeRef$current !== void 0 && _nodeRef$current.scrollIntoView) {
      /*
       * Scrolls the content into view when visible.
       * This improves the UX when there are multiple stacking <PanelBody />
       * components in a scrollable container.
       */
      nodeRef.current.scrollIntoView({
        inline: 'nearest',
        block: 'nearest',
        behavior: scrollBehavior
      });
    }
  }, [isOpened, scrollBehavior]);
  const classes = classnames('components-panel__body', className, {
    'is-opened': isOpened
  });
  return createElement("div", {
    className: classes,
    ref: useMergeRefs([nodeRef, ref])
  }, createElement(PanelBodyTitle, _extends({
    icon: icon,
    isOpened: Boolean(isOpened),
    onClick: handleOnToggle,
    title: title
  }, buttonProps)), typeof children === 'function' ? children({
    opened: Boolean(isOpened)
  }) : isOpened && children);
}
const PanelBodyTitle = forwardRef((_ref, ref) => {
  let {
    isOpened,
    icon,
    title,
    ...props
  } = _ref;
  if (!title) return null;
  return createElement("h2", {
    className: "components-panel__body-title"
  }, createElement(Button, _extends({
    className: "components-panel__body-toggle",
    "aria-expanded": isOpened,
    ref: ref
  }, props), createElement("span", {
    "aria-hidden": "true"
  }, createElement(Icon, {
    className: "components-panel__arrow",
    icon: isOpened ? chevronUp : chevronDown
  })), title, icon && createElement(Icon, {
    icon: icon,
    className: "components-panel__icon",
    size: 20
  })));
});
export const PanelBody = forwardRef(UnforwardedPanelBody);
export default PanelBody;
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