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
|
/*
* 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,
debounceTime,
distinctUntilChanged,
fromEvent,
map,
merge,
shareReplay,
startWith
} from "rxjs"
import { getActiveElement } from "../_"
/* ----------------------------------------------------------------------------
* Data
* ------------------------------------------------------------------------- */
/**
* Focus observable
*
* Previously, this observer used `focus` and `blur` events to determine whether
* an element is focused, but this doesn't work if there are focusable elements
* within the elements itself. A better solutions are `focusin` and `focusout`
* events, which bubble up the tree and allow for more fine-grained control.
*
* `debounceTime` is necessary, because when a focus change happens inside an
* element, the observable would first emit `false` and then `true` again.
*/
const observer$ = merge(
fromEvent(document.body, "focusin"),
fromEvent(document.body, "focusout")
)
.pipe(
debounceTime(1),
startWith(undefined),
map(() => getActiveElement() || document.body),
shareReplay(1)
)
/* ----------------------------------------------------------------------------
* Functions
* ------------------------------------------------------------------------- */
/**
* Watch element focus
*
* @param el - Element
*
* @returns Element focus observable
*/
export function watchElementFocus(
el: HTMLElement
): Observable<boolean> {
return observer$
.pipe(
map(active => el.contains(active)),
distinctUntilChanged()
)
}
|