@react-aria/interactions
Version:
Spectrum UI components in React
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text/typescript
/*
* Copyright 2020 Adobe. All rights reserved.
* This file is licensed to you under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License. You may obtain a copy
* of the License at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under
* the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
* OF ANY KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
// Portions of the code in this file are based on code from react.
// Original licensing for the following can be found in the
// NOTICE file in the root directory of this source tree.
// See https://github.com/facebook/react/tree/cc7c1aece46a6b69b41958d731e0fd27c94bfc6c/packages/react-interactions
import {createSyntheticEvent, setEventTarget, useSyntheticBlurEvent} from './utils';
import {DOMAttributes} from '@react-types/shared';
import {FocusEvent, useCallback, useRef} from 'react';
import {getActiveElement, getEventTarget, getOwnerDocument, nodeContains, useGlobalListeners} from '@react-aria/utils';
export interface FocusWithinProps {
/** Whether the focus within events should be disabled. */
isDisabled?: boolean,
/** Handler that is called when the target element or a descendant receives focus. */
onFocusWithin?: (e: FocusEvent) => void,
/** Handler that is called when the target element and all descendants lose focus. */
onBlurWithin?: (e: FocusEvent) => void,
/** Handler that is called when the the focus within state changes. */
onFocusWithinChange?: (isFocusWithin: boolean) => void
}
export interface FocusWithinResult {
/** Props to spread onto the target element. */
focusWithinProps: DOMAttributes
}
/**
* Handles focus events for the target and its descendants.
*/
export function useFocusWithin(props: FocusWithinProps): FocusWithinResult {
let {
isDisabled,
onBlurWithin,
onFocusWithin,
onFocusWithinChange
} = props;
let state = useRef({
isFocusWithin: false
});
let {addGlobalListener, removeAllGlobalListeners} = useGlobalListeners();
let onBlur = useCallback((e: FocusEvent) => {
// Ignore events bubbling through portals.
if (!e.currentTarget.contains(e.target)) {
return;
}
// We don't want to trigger onBlurWithin and then immediately onFocusWithin again
// when moving focus inside the element. Only trigger if the currentTarget doesn't
// include the relatedTarget (where focus is moving).
if (state.current.isFocusWithin && !(e.currentTarget as Element).contains(e.relatedTarget as Element)) {
state.current.isFocusWithin = false;
removeAllGlobalListeners();
if (onBlurWithin) {
onBlurWithin(e);
}
if (onFocusWithinChange) {
onFocusWithinChange(false);
}
}
}, [onBlurWithin, onFocusWithinChange, state, removeAllGlobalListeners]);
let onSyntheticFocus = useSyntheticBlurEvent(onBlur);
let onFocus = useCallback((e: FocusEvent) => {
// Ignore events bubbling through portals.
if (!e.currentTarget.contains(e.target)) {
return;
}
// Double check that document.activeElement actually matches e.target in case a previously chained
// focus handler already moved focus somewhere else.
const ownerDocument = getOwnerDocument(e.target);
const activeElement = getActiveElement(ownerDocument);
if (!state.current.isFocusWithin && activeElement === getEventTarget(e.nativeEvent)) {
if (onFocusWithin) {
onFocusWithin(e);
}
if (onFocusWithinChange) {
onFocusWithinChange(true);
}
state.current.isFocusWithin = true;
onSyntheticFocus(e);
// Browsers don't fire blur events when elements are removed from the DOM.
// However, if a focus event occurs outside the element we're tracking, we
// can manually fire onBlur.
let currentTarget = e.currentTarget;
addGlobalListener(ownerDocument, 'focus', e => {
if (state.current.isFocusWithin && !nodeContains(currentTarget, e.target as Element)) {
let nativeEvent = new ownerDocument.defaultView!.FocusEvent('blur', {relatedTarget: e.target});
setEventTarget(nativeEvent, currentTarget);
let event = createSyntheticEvent<FocusEvent>(nativeEvent);
onBlur(event);
}
}, {capture: true});
}
}, [onFocusWithin, onFocusWithinChange, onSyntheticFocus, addGlobalListener, onBlur]);
if (isDisabled) {
return {
focusWithinProps: {
// These cannot be null, that would conflict in mergeProps
onFocus: undefined,
onBlur: undefined
}
};
}
return {
focusWithinProps: {
onFocus,
onBlur
}
};
}