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import { useCallback, useMemo, useRef } from 'react';
import useEventCallback from './useEventCallback';
import useMounted from './useMounted';
/**
* useFocusManager provides a way to track and manage focus as it moves around
* a container element. An `onChange` is fired when focus enters or leaves the
* element, but not when it moves around inside the element, similar to
* `pointerenter` and `pointerleave` DOM events.
*
* ```tsx
* const [focused, setFocusState] = useState(false)
*
* const { onBlur, onFocus } = useFocusManager({
* onChange: nextFocused => setFocusState(nextFocused)
* })
*
* return (
* <div tabIndex="-1" onFocus={onFocus} onBlur={onBlur}>
* {String(focused)}
* <input />
* <input />
*
* <button>A button</button>
* </div>
* ```
*
* @returns a memoized FocusController containing event handlers
*/
export default function useFocusManager(opts) {
const isMounted = useMounted();
const lastFocused = useRef();
const handle = useRef();
const willHandle = useEventCallback(opts.willHandle);
const didHandle = useEventCallback(opts.didHandle);
const onChange = useEventCallback(opts.onChange);
const isDisabled = useEventCallback(opts.isDisabled);
const handleChange = useCallback((focused, event) => {
if (focused !== lastFocused.current) {
didHandle == null ? void 0 : didHandle(focused, event);
// only fire a change when unmounted if its a blur
if (isMounted() || !focused) {
lastFocused.current = focused;
onChange == null ? void 0 : onChange(focused, event);
}
}
}, [isMounted, didHandle, onChange, lastFocused]);
const handleFocusChange = useCallback((focused, event) => {
if (isDisabled()) return;
if (event && event.persist) event.persist();
if ((willHandle == null ? void 0 : willHandle(focused, event)) === false) {
return;
}
clearTimeout(handle.current);
if (focused) {
handleChange(focused, event);
} else {
handle.current = window.setTimeout(() => handleChange(focused, event));
}
}, [willHandle, handleChange]);
return useMemo(() => ({
onBlur: event => {
handleFocusChange(false, event);
},
onFocus: event => {
handleFocusChange(true, event);
}
}), [handleFocusChange]);
}