@mui/base/FocusTrap/FocusTrap.js

/* eslint-disable consistent-return, jsx-a11y/no-noninteractive-tabindex */
import * as React from 'react';
import PropTypes from 'prop-types';
import { exactProp, elementAcceptingRef, unstable_useForkRef as useForkRef, unstable_ownerDocument as ownerDocument } from '@mui/utils';
import { jsx as _jsx } from "react/jsx-runtime";
import { jsxs as _jsxs } from "react/jsx-runtime";
// Inspired by https://github.com/focus-trap/tabbable
const candidatesSelector = ['input', 'select', 'textarea', 'a[href]', 'button', '[tabindex]', 'audio[controls]', 'video[controls]', '[contenteditable]:not([contenteditable="false"])'].join(',');
function getTabIndex(node) {
  const tabindexAttr = parseInt(node.getAttribute('tabindex') || '', 10);
  if (!Number.isNaN(tabindexAttr)) {
    return tabindexAttr;
  }

  // Browsers do not return `tabIndex` correctly for contentEditable nodes;
  // https://bugs.chromium.org/p/chromium/issues/detail?id=661108&q=contenteditable%20tabindex&can=2
  // so if they don't have a tabindex attribute specifically set, assume it's 0.
  // in Chrome, <details/>, <audio controls/> and <video controls/> elements get a default
  //  `tabIndex` of -1 when the 'tabindex' attribute isn't specified in the DOM,
  //  yet they are still part of the regular tab order; in FF, they get a default
  //  `tabIndex` of 0; since Chrome still puts those elements in the regular tab
  //  order, consider their tab index to be 0.
  if (node.contentEditable === 'true' || (node.nodeName === 'AUDIO' || node.nodeName === 'VIDEO' || node.nodeName === 'DETAILS') && node.getAttribute('tabindex') === null) {
    return 0;
  }
  return node.tabIndex;
}
function isNonTabbableRadio(node) {
  if (node.tagName !== 'INPUT' || node.type !== 'radio') {
    return false;
  }
  if (!node.name) {
    return false;
  }
  const getRadio = selector => node.ownerDocument.querySelector(`input[type="radio"]${selector}`);
  let roving = getRadio(`[name="${node.name}"]:checked`);
  if (!roving) {
    roving = getRadio(`[name="${node.name}"]`);
  }
  return roving !== node;
}
function isNodeMatchingSelectorFocusable(node) {
  if (node.disabled || node.tagName === 'INPUT' && node.type === 'hidden' || isNonTabbableRadio(node)) {
    return false;
  }
  return true;
}
function defaultGetTabbable(root) {
  const regularTabNodes = [];
  const orderedTabNodes = [];
  Array.from(root.querySelectorAll(candidatesSelector)).forEach((node, i) => {
    const nodeTabIndex = getTabIndex(node);
    if (nodeTabIndex === -1 || !isNodeMatchingSelectorFocusable(node)) {
      return;
    }
    if (nodeTabIndex === 0) {
      regularTabNodes.push(node);
    } else {
      orderedTabNodes.push({
        documentOrder: i,
        tabIndex: nodeTabIndex,
        node: node
      });
    }
  });
  return orderedTabNodes.sort((a, b) => a.tabIndex === b.tabIndex ? a.documentOrder - b.documentOrder : a.tabIndex - b.tabIndex).map(a => a.node).concat(regularTabNodes);
}
function defaultIsEnabled() {
  return true;
}

/**
 * Utility component that locks focus inside the component.
 *
 * Demos:
 *
 * - [Focus Trap](https://mui.com/base/react-focus-trap/)
 *
 * API:
 *
 * - [FocusTrap API](https://mui.com/base/react-focus-trap/components-api/#focus-trap)
 */
function FocusTrap(props) {
  const {
    children,
    disableAutoFocus = false,
    disableEnforceFocus = false,
    disableRestoreFocus = false,
    getTabbable = defaultGetTabbable,
    isEnabled = defaultIsEnabled,
    open
  } = props;
  const ignoreNextEnforceFocus = React.useRef(false);
  const sentinelStart = React.useRef(null);
  const sentinelEnd = React.useRef(null);
  const nodeToRestore = React.useRef(null);
  const reactFocusEventTarget = React.useRef(null);
  // This variable is useful when disableAutoFocus is true.
  // It waits for the active element to move into the component to activate.
  const activated = React.useRef(false);
  const rootRef = React.useRef(null);
  // @ts-expect-error TODO upstream fix
  const handleRef = useForkRef(children.ref, rootRef);
  const lastKeydown = React.useRef(null);
  React.useEffect(() => {
    // We might render an empty child.
    if (!open || !rootRef.current) {
      return;
    }
    activated.current = !disableAutoFocus;
  }, [disableAutoFocus, open]);
  React.useEffect(() => {
    // We might render an empty child.
    if (!open || !rootRef.current) {
      return;
    }
    const doc = ownerDocument(rootRef.current);
    if (!rootRef.current.contains(doc.activeElement)) {
      if (!rootRef.current.hasAttribute('tabIndex')) {
        if (process.env.NODE_ENV !== 'production') {
          console.error(['MUI: The modal content node does not accept focus.', 'For the benefit of assistive technologies, ' + 'the tabIndex of the node is being set to "-1".'].join('\n'));
        }
        rootRef.current.setAttribute('tabIndex', '-1');
      }
      if (activated.current) {
        rootRef.current.focus();
      }
    }
    return () => {
      // restoreLastFocus()
      if (!disableRestoreFocus) {
        // In IE11 it is possible for document.activeElement to be null resulting
        // in nodeToRestore.current being null.
        // Not all elements in IE11 have a focus method.
        // Once IE11 support is dropped the focus() call can be unconditional.
        if (nodeToRestore.current && nodeToRestore.current.focus) {
          ignoreNextEnforceFocus.current = true;
          nodeToRestore.current.focus();
        }
        nodeToRestore.current = null;
      }
    };
    // Missing `disableRestoreFocus` which is fine.
    // We don't support changing that prop on an open FocusTrap
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, [open]);
  React.useEffect(() => {
    // We might render an empty child.
    if (!open || !rootRef.current) {
      return;
    }
    const doc = ownerDocument(rootRef.current);
    const contain = nativeEvent => {
      const {
        current: rootElement
      } = rootRef;

      // Cleanup functions are executed lazily in React 17.
      // Contain can be called between the component being unmounted and its cleanup function being run.
      if (rootElement === null) {
        return;
      }
      if (!doc.hasFocus() || disableEnforceFocus || !isEnabled() || ignoreNextEnforceFocus.current) {
        ignoreNextEnforceFocus.current = false;
        return;
      }
      if (!rootElement.contains(doc.activeElement)) {
        // if the focus event is not coming from inside the children's react tree, reset the refs
        if (nativeEvent && reactFocusEventTarget.current !== nativeEvent.target || doc.activeElement !== reactFocusEventTarget.current) {
          reactFocusEventTarget.current = null;
        } else if (reactFocusEventTarget.current !== null) {
          return;
        }
        if (!activated.current) {
          return;
        }
        let tabbable = [];
        if (doc.activeElement === sentinelStart.current || doc.activeElement === sentinelEnd.current) {
          tabbable = getTabbable(rootRef.current);
        }
        if (tabbable.length > 0) {
          var _lastKeydown$current, _lastKeydown$current2;
          const isShiftTab = Boolean(((_lastKeydown$current = lastKeydown.current) == null ? void 0 : _lastKeydown$current.shiftKey) && ((_lastKeydown$current2 = lastKeydown.current) == null ? void 0 : _lastKeydown$current2.key) === 'Tab');
          const focusNext = tabbable[0];
          const focusPrevious = tabbable[tabbable.length - 1];
          if (typeof focusNext !== 'string' && typeof focusPrevious !== 'string') {
            if (isShiftTab) {
              focusPrevious.focus();
            } else {
              focusNext.focus();
            }
          }
        } else {
          rootElement.focus();
        }
      }
    };
    const loopFocus = nativeEvent => {
      lastKeydown.current = nativeEvent;
      if (disableEnforceFocus || !isEnabled() || nativeEvent.key !== 'Tab') {
        return;
      }

      // Make sure the next tab starts from the right place.
      // doc.activeElement refers to the origin.
      if (doc.activeElement === rootRef.current && nativeEvent.shiftKey) {
        // We need to ignore the next contain as
        // it will try to move the focus back to the rootRef element.
        ignoreNextEnforceFocus.current = true;
        if (sentinelEnd.current) {
          sentinelEnd.current.focus();
        }
      }
    };
    doc.addEventListener('focusin', contain);
    doc.addEventListener('keydown', loopFocus, true);

    // With Edge, Safari and Firefox, no focus related events are fired when the focused area stops being a focused area.
    // e.g. https://bugzilla.mozilla.org/show_bug.cgi?id=559561.
    // Instead, we can look if the active element was restored on the BODY element.
    //
    // The whatwg spec defines how the browser should behave but does not explicitly mention any events:
    // https://html.spec.whatwg.org/multipage/interaction.html#focus-fixup-rule.
    const interval = setInterval(() => {
      if (doc.activeElement && doc.activeElement.tagName === 'BODY') {
        contain(null);
      }
    }, 50);
    return () => {
      clearInterval(interval);
      doc.removeEventListener('focusin', contain);
      doc.removeEventListener('keydown', loopFocus, true);
    };
  }, [disableAutoFocus, disableEnforceFocus, disableRestoreFocus, isEnabled, open, getTabbable]);
  const onFocus = event => {
    if (nodeToRestore.current === null) {
      nodeToRestore.current = event.relatedTarget;
    }
    activated.current = true;
    reactFocusEventTarget.current = event.target;
    const childrenPropsHandler = children.props.onFocus;
    if (childrenPropsHandler) {
      childrenPropsHandler(event);
    }
  };
  const handleFocusSentinel = event => {
    if (nodeToRestore.current === null) {
      nodeToRestore.current = event.relatedTarget;
    }
    activated.current = true;
  };
  return /*#__PURE__*/_jsxs(React.Fragment, {
    children: [/*#__PURE__*/_jsx("div", {
      tabIndex: open ? 0 : -1,
      onFocus: handleFocusSentinel,
      ref: sentinelStart,
      "data-testid": "sentinelStart"
    }), /*#__PURE__*/React.cloneElement(children, {
      ref: handleRef,
      onFocus
    }), /*#__PURE__*/_jsx("div", {
      tabIndex: open ? 0 : -1,
      onFocus: handleFocusSentinel,
      ref: sentinelEnd,
      "data-testid": "sentinelEnd"
    })]
  });
}
process.env.NODE_ENV !== "production" ? FocusTrap.propTypes /* remove-proptypes */ = {
  // ----------------------------- Warning --------------------------------
  // | These PropTypes are generated from the TypeScript type definitions |
  // |     To update them edit TypeScript types and run "yarn proptypes"  |
  // ----------------------------------------------------------------------
  /**
   * A single child content element.
   */
  children: elementAcceptingRef,
  /**
   * If `true`, the focus trap will not automatically shift focus to itself when it opens, and
   * replace it to the last focused element when it closes.
   * This also works correctly with any focus trap children that have the `disableAutoFocus` prop.
   *
   * Generally this should never be set to `true` as it makes the focus trap less
   * accessible to assistive technologies, like screen readers.
   * @default false
   */
  disableAutoFocus: PropTypes.bool,
  /**
   * If `true`, the focus trap will not prevent focus from leaving the focus trap while open.
   *
   * Generally this should never be set to `true` as it makes the focus trap less
   * accessible to assistive technologies, like screen readers.
   * @default false
   */
  disableEnforceFocus: PropTypes.bool,
  /**
   * If `true`, the focus trap will not restore focus to previously focused element once
   * focus trap is hidden or unmounted.
   * @default false
   */
  disableRestoreFocus: PropTypes.bool,
  /**
   * Returns an array of ordered tabbable nodes (i.e. in tab order) within the root.
   * For instance, you can provide the "tabbable" npm dependency.
   * @param {HTMLElement} root
   */
  getTabbable: PropTypes.func,
  /**
   * This prop extends the `open` prop.
   * It allows to toggle the open state without having to wait for a rerender when changing the `open` prop.
   * This prop should be memoized.
   * It can be used to support multiple focus trap mounted at the same time.
   * @default function defaultIsEnabled(): boolean {
   *   return true;
   * }
   */
  isEnabled: PropTypes.func,
  /**
   * If `true`, focus is locked.
   */
  open: PropTypes.bool.isRequired
} : void 0;
if (process.env.NODE_ENV !== 'production') {
  // eslint-disable-next-line
  FocusTrap['propTypes' + ''] = exactProp(FocusTrap.propTypes);
}
export default FocusTrap;