mirror of
https://github.com/squidfunk/mkdocs-material.git
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53 lines
1.9 KiB
TypeScript
53 lines
1.9 KiB
TypeScript
/*
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* Copyright (c) 2016-2019 Martin Donath <martin.donath@squidfunk.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to
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* deal in the Software without restriction, including without limitation the
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* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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import { Observable, fromEvent, merge } from "rxjs"
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import { mapTo, shareReplay, startWith } from "rxjs/operators"
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/* ----------------------------------------------------------------------------
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* Functions
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* ------------------------------------------------------------------------- */
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/**
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* Watch element focus
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*
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* @param el - Element
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*
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* @return Element focus observable
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*/
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export function watchElementFocus(
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el: HTMLElement
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): Observable<boolean> {
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const focus$ = fromEvent(el, "focus")
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const blur$ = fromEvent(el, "blur")
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/* Map events to boolean state */
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return merge(
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focus$.pipe(mapTo(true)),
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blur$.pipe(mapTo(false))
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)
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.pipe(
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startWith(el === document.activeElement),
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shareReplay(1)
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)
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}
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