1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
|
/*
* Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
import {
Observable,
filter,
fromEvent,
map,
mergeMap,
switchMap,
tap
} from "rxjs"
import { getElements } from "~/browser"
/* ----------------------------------------------------------------------------
* Helper types
* ------------------------------------------------------------------------- */
/**
* Patch options
*/
interface PatchOptions {
document$: Observable<Document> /* Document observable */
}
/* ----------------------------------------------------------------------------
* Helper functions
* ------------------------------------------------------------------------- */
/**
* Check whether the given device is an Apple device
*
* @returns Test result
*/
function isAppleDevice(): boolean {
return /(iPad|iPhone|iPod)/.test(navigator.userAgent)
}
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Patch all elements with `data-md-scrollfix` attributes
*
* This is a year-old patch which ensures that overflow scrolling works at the
* top and bottom of containers on iOS by ensuring a `1px` scroll offset upon
* the start of a touch event.
*
* @see https://bit.ly/2SCtAOO - Original source
*
* @param options - Options
*/
export function patchScrollfix(
{ document$ }: PatchOptions
): void {
document$
.pipe(
switchMap(() => getElements("[data-md-scrollfix]")),
tap(el => el.removeAttribute("data-md-scrollfix")),
filter(isAppleDevice),
mergeMap(el => fromEvent(el, "touchstart")
.pipe(
map(() => el)
)
)
)
.subscribe(el => {
const top = el.scrollTop
/* We're at the top of the container */
if (top === 0) {
el.scrollTop = 1
/* We're at the bottom of the container */
} else if (top + el.offsetHeight === el.scrollHeight) {
el.scrollTop = top - 1
}
})
}
|