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
|
/*
* 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 {
EMPTY,
Observable,
fromEvent,
fromEventPattern,
map,
merge,
startWith,
switchMap
} from "rxjs"
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Watch media query
*
* Note that although `MediaQueryList.addListener` is deprecated we have to
* use it, because it's the only way to ensure proper downward compatibility.
*
* @see https://bit.ly/3dUBH2m - GitHub issue
*
* @param query - Media query
*
* @returns Media observable
*/
export function watchMedia(query: string): Observable<boolean> {
const media = matchMedia(query)
return fromEventPattern<boolean>(next => (
media.addListener(() => next(media.matches))
))
.pipe(
startWith(media.matches)
)
}
/**
* Watch print mode
*
* @returns Print observable
*/
export function watchPrint(): Observable<boolean> {
const media = matchMedia("print")
return merge(
fromEvent(window, "beforeprint").pipe(map(() => true)),
fromEvent(window, "afterprint").pipe(map(() => false))
)
.pipe(
startWith(media.matches)
)
}
/* ------------------------------------------------------------------------- */
/**
* Toggle an observable with a media observable
*
* @template T - Data type
*
* @param query$ - Media observable
* @param factory - Observable factory
*
* @returns Toggled observable
*/
export function at<T>(
query$: Observable<boolean>, factory: () => Observable<T>
): Observable<T> {
return query$
.pipe(
switchMap(active => active ? factory() : EMPTY)
)
}
|