mirror of
https://github.com/squidfunk/mkdocs-material.git
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105 lines
3.4 KiB
TypeScript
105 lines
3.4 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 { NEVER, Observable, fromEvent, iif, merge } from "rxjs"
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import { map, mapTo, shareReplay, switchMap } from "rxjs/operators"
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import { getElements } from "browser"
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/* ----------------------------------------------------------------------------
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* Helper types
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* ------------------------------------------------------------------------- */
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/**
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* Patch options
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*/
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interface PatchOptions {
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document$: Observable<Document> /* Document observable */
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}
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/* ----------------------------------------------------------------------------
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* Helper functions
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* ------------------------------------------------------------------------- */
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/**
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* Check whether the given device is an Apple device
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*
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* @return Test result
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*/
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function isAppleDevice(): boolean {
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return /(iPad|iPhone|iPod)/.test(navigator.userAgent)
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}
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/* ----------------------------------------------------------------------------
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* Functions
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* ------------------------------------------------------------------------- */
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/**
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* Patch all elements with `data-md-scrollfix` attributes
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*
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* This is a year-old patch which ensures that overflow scrolling works at the
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* top and bottom of containers on iOS by ensuring a `1px` scroll offset upon
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* the start of a touch event.
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*
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* @see https://bit.ly/2SCtAOO - Original source
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*
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* @param options - Options
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*/
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export function patchScrollfix(
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{ document$ }: PatchOptions
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): void {
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const els$ = document$
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.pipe(
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map(() => getElements("[data-md-scrollfix]")),
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shareReplay({ bufferSize: 1, refCount: true })
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)
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/* Remove marker attribute, so we'll only add the fix once */
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els$.subscribe(els => {
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for (const el of els)
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el.removeAttribute("data-md-scrollfix")
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})
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/* Patch overflow scrolling on touch start */
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iif(isAppleDevice, els$, NEVER)
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.pipe(
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switchMap(els => merge(...els.map(el => (
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fromEvent(el, "touchstart", { passive: true })
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.pipe(
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mapTo(el)
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)
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))))
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)
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.subscribe(el => {
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const top = el.scrollTop
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/* We're at the top of the container */
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if (top === 0) {
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el.scrollTop = 1
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/* We're at the bottom of the container */
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} else if (top + el.offsetHeight === el.scrollHeight) {
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el.scrollTop = top - 1
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}
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})
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}
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