mirror of
https://github.com/squidfunk/mkdocs-material.git
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67 lines
2.1 KiB
TypeScript
67 lines
2.1 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 { OperatorFunction, animationFrameScheduler, pipe } from "rxjs"
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import {
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distinctUntilChanged,
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finalize,
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map,
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observeOn,
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tap
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} from "rxjs/operators"
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import { resetHidden, setHidden } from "actions"
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import { ViewportOffset } from "../agent"
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/* ----------------------------------------------------------------------------
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* Functions
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* ------------------------------------------------------------------------- */
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/**
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* Paint hideable from source observable
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*
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* @param el - Hideable element
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* @param offset - Additional offset
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*
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* @return Operator function
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*/
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export function paintHidden(
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el: HTMLElement, offset: number = 0
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): OperatorFunction<ViewportOffset, boolean> {
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return pipe(
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map(({ y }) => y >= offset),
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distinctUntilChanged(),
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/* Defer repaint to next animation frame */
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observeOn(animationFrameScheduler),
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tap(value => {
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setHidden(el, value)
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}),
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/* Reset on complete or error */
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finalize(() => {
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resetHidden(el)
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})
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)
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}
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