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FloatingFocusManager.tsx
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FloatingFocusManager.tsx
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import {
activeElement,
contains,
getDocument,
getTarget,
isTypeableCombobox,
isVirtualClick,
isVirtualPointerEvent,
stopEvent,
} from '@floating-ui/react/utils';
import {getNodeName, isHTMLElement} from '@floating-ui/utils/dom';
import * as React from 'react';
import type {FocusableElement} from 'tabbable';
import {tabbable, isTabbable} from 'tabbable';
import useModernLayoutEffect from 'use-isomorphic-layout-effect';
import {useLatestRef} from '../hooks/utils/useLatestRef';
import type {FloatingContext, OpenChangeReason, ReferenceType} from '../types';
import {createAttribute} from '../utils/createAttribute';
import {enqueueFocus} from '../utils/enqueueFocus';
import {getAncestors} from '../utils/getAncestors';
import {getChildren} from '../utils/getChildren';
import {markOthers, supportsInert} from '../utils/markOthers';
import {
getNextTabbable,
getPreviousTabbable,
getTabbableOptions,
isOutsideEvent,
} from '../utils/tabbable';
import {usePortalContext} from './FloatingPortal';
import {useFloatingTree} from './FloatingTree';
import {FocusGuard, HIDDEN_STYLES} from './FocusGuard';
const LIST_LIMIT = 20;
let previouslyFocusedElements: Element[] = [];
function addPreviouslyFocusedElement(element: Element | null) {
previouslyFocusedElements = previouslyFocusedElements.filter(
(el) => el.isConnected,
);
let tabbableEl = element;
if (!tabbableEl || getNodeName(tabbableEl) === 'body') return;
if (!isTabbable(tabbableEl, getTabbableOptions())) {
const tabbableChild = tabbable(tabbableEl, getTabbableOptions())[0];
if (!tabbableChild) return;
tabbableEl = tabbableChild;
}
previouslyFocusedElements.push(tabbableEl);
if (previouslyFocusedElements.length > LIST_LIMIT) {
previouslyFocusedElements = previouslyFocusedElements.slice(-LIST_LIMIT);
}
}
function getPreviouslyFocusedElement() {
return previouslyFocusedElements
.slice()
.reverse()
.find((el) => el.isConnected);
}
const VisuallyHiddenDismiss = React.forwardRef(function VisuallyHiddenDismiss(
props: React.ButtonHTMLAttributes<HTMLButtonElement>,
ref: React.ForwardedRef<HTMLButtonElement>,
) {
return (
<button
{...props}
type="button"
ref={ref}
tabIndex={-1}
style={HIDDEN_STYLES}
/>
);
});
export interface FloatingFocusManagerProps<
RT extends ReferenceType = ReferenceType,
> {
children: React.JSX.Element;
/**
* The floating context returned from `useFloating`.
*/
context: FloatingContext<RT>;
/**
* Whether or not the focus manager should be disabled. Useful to delay focus
* management until after a transition completes or some other conditional
* state.
* @default false
*/
disabled?: boolean;
/**
* The order in which focus cycles.
* @default ['content']
*/
order?: Array<'reference' | 'floating' | 'content'>;
/**
* Which element to initially focus. Can be either a number (tabbable index as
* specified by the `order`) or a ref.
* @default 0
*/
initialFocus?: number | React.MutableRefObject<HTMLElement | null>;
/**
* Determines if the focus guards are rendered. If not, focus can escape into
* the address bar/console/browser UI, like in native dialogs.
* @default true
*/
guards?: boolean;
/**
* Determines if focus should be returned to the reference element once the
* floating element closes/unmounts (or if that is not available, the
* previously focused element). This prop is ignored if the floating element
* lost focus.
* @default true
*/
returnFocus?: boolean;
/**
* Determines if focus is “modal”, meaning focus is fully trapped inside the
* floating element and outside content cannot be accessed. This includes
* screen reader virtual cursors.
* @default true
*/
modal?: boolean;
/**
* If your focus management is modal and there is no explicit close button
* available, you can use this prop to render a visually-hidden dismiss
* button at the start and end of the floating element. This allows
* touch-based screen readers to escape the floating element due to lack of
* an `esc` key.
* @default undefined
*/
visuallyHiddenDismiss?: boolean | string;
/**
* Determines whether `focusout` event listeners that control whether the
* floating element should be closed if the focus moves outside of it are
* attached to the reference and floating elements. This affects non-modal
* focus management.
* @default true
*/
closeOnFocusOut?: boolean;
}
/**
* Provides focus management for the floating element.
* @see https://floating-ui.com/docs/FloatingFocusManager
*/
export function FloatingFocusManager<RT extends ReferenceType = ReferenceType>(
props: FloatingFocusManagerProps<RT>,
): React.JSX.Element {
const {
context,
children,
disabled = false,
order = ['content'],
guards: _guards = true,
initialFocus = 0,
returnFocus = true,
modal = true,
visuallyHiddenDismiss = false,
closeOnFocusOut = true,
} = props;
const {
open,
refs,
nodeId,
onOpenChange,
events,
dataRef,
elements: {domReference, floating},
} = context;
const ignoreInitialFocus =
typeof initialFocus === 'number' && initialFocus < 0;
// If the reference is a combobox and is typeable (e.g. input/textarea),
// there are different focus semantics. The guards should not be rendered, but
// aria-hidden should be applied to all nodes still. Further, the visually
// hidden dismiss button should only appear at the end of the list, not the
// start.
const isUntrappedTypeableCombobox =
isTypeableCombobox(domReference) && ignoreInitialFocus;
// Force the guards to be rendered if the `inert` attribute is not supported.
const guards = supportsInert() ? _guards : true;
const orderRef = useLatestRef(order);
const initialFocusRef = useLatestRef(initialFocus);
const returnFocusRef = useLatestRef(returnFocus);
const tree = useFloatingTree();
const portalContext = usePortalContext();
const startDismissButtonRef = React.useRef<HTMLButtonElement>(null);
const endDismissButtonRef = React.useRef<HTMLButtonElement>(null);
const preventReturnFocusRef = React.useRef(false);
const isPointerDownRef = React.useRef(false);
const isInsidePortal = portalContext != null;
const getTabbableContent = React.useCallback(
(container: HTMLElement | null = floating) => {
return container ? tabbable(container, getTabbableOptions()) : [];
},
[floating],
);
const getTabbableElements = React.useCallback(
(container?: HTMLElement) => {
const content = getTabbableContent(container);
return orderRef.current
.map((type) => {
if (domReference && type === 'reference') {
return domReference;
}
if (floating && type === 'floating') {
return floating;
}
return content;
})
.filter(Boolean)
.flat() as Array<FocusableElement>;
},
[domReference, floating, orderRef, getTabbableContent],
);
React.useEffect(() => {
if (disabled || !modal) return;
function onKeyDown(event: KeyboardEvent) {
if (event.key === 'Tab') {
// The focus guards have nothing to focus, so we need to stop the event.
if (
contains(floating, activeElement(getDocument(floating))) &&
getTabbableContent().length === 0 &&
!isUntrappedTypeableCombobox
) {
stopEvent(event);
}
const els = getTabbableElements();
const target = getTarget(event);
if (orderRef.current[0] === 'reference' && target === domReference) {
stopEvent(event);
if (event.shiftKey) {
enqueueFocus(els[els.length - 1]);
} else {
enqueueFocus(els[1]);
}
}
if (
orderRef.current[1] === 'floating' &&
target === floating &&
event.shiftKey
) {
stopEvent(event);
enqueueFocus(els[0]);
}
}
}
const doc = getDocument(floating);
doc.addEventListener('keydown', onKeyDown);
return () => {
doc.removeEventListener('keydown', onKeyDown);
};
}, [
disabled,
domReference,
floating,
modal,
orderRef,
isUntrappedTypeableCombobox,
getTabbableContent,
getTabbableElements,
]);
React.useEffect(() => {
if (disabled || !closeOnFocusOut) return;
// In Safari, buttons lose focus when pressing them.
function handlePointerDown() {
isPointerDownRef.current = true;
setTimeout(() => {
isPointerDownRef.current = false;
});
}
function handleFocusOutside(event: FocusEvent) {
const relatedTarget = event.relatedTarget as Element | null;
queueMicrotask(() => {
const movedToUnrelatedNode = !(
contains(domReference, relatedTarget) ||
contains(floating, relatedTarget) ||
contains(relatedTarget, floating) ||
contains(portalContext?.portalNode, relatedTarget) ||
relatedTarget?.hasAttribute(createAttribute('focus-guard')) ||
(tree &&
(getChildren(tree.nodesRef.current, nodeId).find(
(node) =>
contains(node.context?.elements.floating, relatedTarget) ||
contains(node.context?.elements.domReference, relatedTarget),
) ||
getAncestors(tree.nodesRef.current, nodeId).find(
(node) =>
node.context?.elements.floating === relatedTarget ||
node.context?.elements.domReference === relatedTarget,
)))
);
// Focus did not move inside the floating tree, and there are no tabbable
// portal guards to handle closing.
if (
relatedTarget &&
movedToUnrelatedNode &&
!isPointerDownRef.current &&
// Fix React 18 Strict Mode returnFocus due to double rendering.
relatedTarget !== getPreviouslyFocusedElement()
) {
preventReturnFocusRef.current = true;
onOpenChange(false, event);
}
});
}
if (floating && isHTMLElement(domReference)) {
domReference.addEventListener('focusout', handleFocusOutside);
domReference.addEventListener('pointerdown', handlePointerDown);
!modal && floating.addEventListener('focusout', handleFocusOutside);
return () => {
domReference.removeEventListener('focusout', handleFocusOutside);
domReference.removeEventListener('pointerdown', handlePointerDown);
!modal && floating.removeEventListener('focusout', handleFocusOutside);
};
}
}, [
disabled,
domReference,
floating,
modal,
nodeId,
tree,
portalContext,
onOpenChange,
closeOnFocusOut,
]);
React.useEffect(() => {
if (disabled) return;
// Don't hide portals nested within the parent portal.
const portalNodes = Array.from(
portalContext?.portalNode?.querySelectorAll(
`[${createAttribute('portal')}]`,
) || [],
);
if (floating) {
const insideElements = [
floating,
...portalNodes,
startDismissButtonRef.current,
endDismissButtonRef.current,
orderRef.current.includes('reference') || isUntrappedTypeableCombobox
? domReference
: null,
].filter((x): x is Element => x != null);
const cleanup =
modal || isUntrappedTypeableCombobox
? markOthers(insideElements, guards, !guards)
: markOthers(insideElements);
return () => {
cleanup();
};
}
}, [
disabled,
domReference,
floating,
modal,
orderRef,
portalContext,
isUntrappedTypeableCombobox,
guards,
]);
useModernLayoutEffect(() => {
if (disabled || !floating) return;
const doc = getDocument(floating);
const previouslyFocusedElement = activeElement(doc);
// Wait for any layout effect state setters to execute to set `tabIndex`.
queueMicrotask(() => {
const focusableElements = getTabbableElements(floating);
const initialFocusValue = initialFocusRef.current;
const elToFocus =
(typeof initialFocusValue === 'number'
? focusableElements[initialFocusValue]
: initialFocusValue.current) || floating;
const focusAlreadyInsideFloatingEl = contains(
floating,
previouslyFocusedElement,
);
if (!ignoreInitialFocus && !focusAlreadyInsideFloatingEl && open) {
enqueueFocus(elToFocus, {preventScroll: elToFocus === floating});
}
});
}, [
disabled,
open,
floating,
ignoreInitialFocus,
getTabbableElements,
initialFocusRef,
]);
useModernLayoutEffect(() => {
if (disabled || !floating) return;
let preventReturnFocusScroll = false;
const doc = getDocument(floating);
const previouslyFocusedElement = activeElement(doc);
const contextData = dataRef.current;
addPreviouslyFocusedElement(previouslyFocusedElement);
// Dismissing via outside press should always ignore `returnFocus` to
// prevent unwanted scrolling.
function onOpenChange({
reason,
event,
nested,
}: {
reason: OpenChangeReason;
event: Event;
nested: boolean;
}) {
if (reason === 'escape-key' && refs.domReference.current) {
addPreviouslyFocusedElement(refs.domReference.current);
}
if (reason === 'hover' && event.type === 'mouseleave') {
preventReturnFocusRef.current = true;
}
if (reason !== 'outside-press') return;
if (nested) {
preventReturnFocusRef.current = false;
preventReturnFocusScroll = true;
} else {
preventReturnFocusRef.current = !(
isVirtualClick(event as MouseEvent) ||
isVirtualPointerEvent(event as PointerEvent)
);
}
}
events.on('openchange', onOpenChange);
return () => {
events.off('openchange', onOpenChange);
const activeEl = activeElement(doc);
const isFocusInsideFloatingTree =
contains(floating, activeEl) ||
(tree &&
getChildren(tree.nodesRef.current, nodeId).some((node) =>
contains(node.context?.elements.floating, activeEl),
));
const shouldFocusReference =
isFocusInsideFloatingTree ||
(contextData.openEvent &&
['click', 'mousedown'].includes(contextData.openEvent.type));
if (shouldFocusReference && refs.domReference.current) {
addPreviouslyFocusedElement(refs.domReference.current);
}
const returnElement = getPreviouslyFocusedElement();
if (
returnFocusRef.current &&
!preventReturnFocusRef.current &&
isHTMLElement(returnElement) &&
// If the focus moved somewhere else after mount, avoid returning focus
// since it likely entered a different element which should be
// respected: https://github.com/floating-ui/floating-ui/issues/2607
(returnElement !== activeEl && activeEl !== doc.body
? isFocusInsideFloatingTree
: true)
) {
enqueueFocus(returnElement, {
// When dismissing nested floating elements, by the time the rAF has
// executed, the menus will all have been unmounted. When they try
// to get focused, the calls get ignored — leaving the root
// reference focused as desired.
cancelPrevious: false,
preventScroll: preventReturnFocusScroll,
});
}
};
}, [disabled, floating, returnFocusRef, dataRef, refs, events, tree, nodeId]);
// Synchronize the `context` & `modal` value to the FloatingPortal context.
// It will decide whether or not it needs to render its own guards.
useModernLayoutEffect(() => {
if (disabled || !portalContext) return;
portalContext.setFocusManagerState({
modal,
closeOnFocusOut,
open,
onOpenChange,
refs,
});
return () => {
portalContext.setFocusManagerState(null);
};
}, [
disabled,
portalContext,
modal,
open,
onOpenChange,
refs,
closeOnFocusOut,
]);
useModernLayoutEffect(() => {
if (
disabled ||
!floating ||
typeof MutationObserver !== 'function' ||
ignoreInitialFocus
) {
return;
}
const handleMutation = () => {
const tabIndex = floating.getAttribute('tabindex');
if (
orderRef.current.includes('floating') ||
(activeElement(getDocument(floating)) !== refs.domReference.current &&
getTabbableContent().length === 0)
) {
if (tabIndex !== '0') {
floating.setAttribute('tabindex', '0');
}
} else if (tabIndex !== '-1') {
floating.setAttribute('tabindex', '-1');
}
};
handleMutation();
const observer = new MutationObserver(handleMutation);
observer.observe(floating, {
childList: true,
subtree: true,
attributes: true,
});
return () => {
observer.disconnect();
};
}, [
disabled,
floating,
refs,
orderRef,
getTabbableContent,
ignoreInitialFocus,
]);
function renderDismissButton(location: 'start' | 'end') {
if (disabled || !visuallyHiddenDismiss || !modal) {
return null;
}
return (
<VisuallyHiddenDismiss
ref={location === 'start' ? startDismissButtonRef : endDismissButtonRef}
onClick={(event) => onOpenChange(false, event.nativeEvent)}
>
{typeof visuallyHiddenDismiss === 'string'
? visuallyHiddenDismiss
: 'Dismiss'}
</VisuallyHiddenDismiss>
);
}
const shouldRenderGuards = !disabled && guards && (isInsidePortal || modal);
return (
<>
{shouldRenderGuards && (
<FocusGuard
data-type="inside"
ref={portalContext?.beforeInsideRef}
onFocus={(event) => {
if (modal) {
const els = getTabbableElements();
enqueueFocus(
order[0] === 'reference' ? els[0] : els[els.length - 1],
);
} else if (
portalContext?.preserveTabOrder &&
portalContext.portalNode
) {
preventReturnFocusRef.current = false;
if (isOutsideEvent(event, portalContext.portalNode)) {
const nextTabbable = getNextTabbable() || domReference;
nextTabbable?.focus();
} else {
portalContext.beforeOutsideRef.current?.focus();
}
}
}}
/>
)}
{/*
Ensure the first swipe is the list item. The end of the listbox popup
will have a dismiss button.
*/}
{!isUntrappedTypeableCombobox && renderDismissButton('start')}
{children}
{renderDismissButton('end')}
{shouldRenderGuards && (
<FocusGuard
data-type="inside"
ref={portalContext?.afterInsideRef}
onFocus={(event) => {
if (modal) {
enqueueFocus(getTabbableElements()[0]);
} else if (
portalContext?.preserveTabOrder &&
portalContext.portalNode
) {
if (closeOnFocusOut) {
preventReturnFocusRef.current = true;
}
if (isOutsideEvent(event, portalContext.portalNode)) {
const prevTabbable = getPreviousTabbable() || domReference;
prevTabbable?.focus();
} else {
portalContext.afterOutsideRef.current?.focus();
}
}
}}
/>
)}
</>
);
}