mirror of
https://github.com/squidfunk/mkdocs-material.git
synced 2024-06-14 11:52:32 +03:00
79 lines
2.7 KiB
TypeScript
79 lines
2.7 KiB
TypeScript
/*
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* Copyright (c) 2016-2020 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 { findLast } from "ramda"
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import { Observable, fromEvent, merge } from "rxjs"
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import { map, scan } from "rxjs/operators"
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import {
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getElement,
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getElementOrThrow
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} from "observables"
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import { NavigationLayer } from "../_"
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/* ----------------------------------------------------------------------------
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* Functions
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* ------------------------------------------------------------------------- */
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/**
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* Watch navigation layer
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*
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* On iOS we want to add `-webkit-overflow-scrolling: touch` for the menus
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* contained in the drawer, but as the navigational layers are nested, we can
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* only add it to the topmost layer or extremely weird cropping will occur.
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* This implementation keeps track of the previous and current layer.
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*
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* @param els - Navigation elements
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*
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* @return Navigation layer observable
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*/
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export function watchNavigationLayer(
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els: HTMLElement[]
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): Observable<NavigationLayer> {
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const table = new Map<HTMLInputElement, HTMLElement>()
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for (const el of els) {
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const label = getElement<HTMLLabelElement>("label", el)
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if (typeof label !== "undefined") {
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const input = getElementOrThrow<HTMLInputElement>(`#${label.htmlFor}`)
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table.set(input, el)
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}
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}
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/* Determine topmost layer */
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const layer$ = merge(...[...table.keys()].map(input => (
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fromEvent(input, "change")
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)))
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.pipe(
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map(() => getElementOrThrow(".md-nav__list", table.get(
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findLast(({ checked }) => checked, [...table.keys()])!
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)))
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)
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/* Return previous and next layer */
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return layer$
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.pipe(
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map(next => ({ next })),
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scan(({ next: prev }, { next }) => ({ prev, next }))
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)
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}
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