]>
Commit | Line | Data |
---|---|---|
d142c7b9 | 1 | import { fromEvent, Observable, Subscription } from 'rxjs' |
14aa8556 | 2 | import { distinctUntilChanged, filter, map, share, startWith, throttleTime } from 'rxjs/operators' |
617f4f5c | 3 | import { AfterViewChecked, Directive, ElementRef, EventEmitter, Input, OnDestroy, OnInit, Output } from '@angular/core' |
dd24f1bb | 4 | import { PeerTubeRouterService, RouterSetting } from '@app/core' |
0cd4344f C |
5 | |
6 | @Directive({ | |
7 | selector: '[myInfiniteScroller]' | |
8 | }) | |
617f4f5c | 9 | export class InfiniteScrollerDirective implements OnInit, OnDestroy, AfterViewChecked { |
0cd4344f | 10 | @Input() percentLimit = 70 |
bce47964 | 11 | @Input() onItself = false |
ad453580 | 12 | @Input() dataObservable: Observable<any[]> |
0cd4344f | 13 | |
dd24f1bb C |
14 | // Add angular state in query params to reuse the routed component |
15 | @Input() setAngularState: boolean | |
0af2a8c5 | 16 | @Input() parentDisabled = false |
dd24f1bb | 17 | |
0cd4344f | 18 | @Output() nearOfBottom = new EventEmitter<void>() |
0cd4344f C |
19 | |
20 | private decimalLimit = 0 | |
21 | private lastCurrentBottom = -1 | |
9af61e84 | 22 | private scrollDownSub: Subscription |
bce47964 | 23 | private container: HTMLElement |
0cd4344f | 24 | |
ad453580 C |
25 | private checkScroll = false |
26 | ||
dd24f1bb C |
27 | constructor ( |
28 | private peertubeRouter: PeerTubeRouterService, | |
29 | private el: ElementRef | |
30 | ) { | |
0cd4344f C |
31 | this.decimalLimit = this.percentLimit / 100 |
32 | } | |
33 | ||
617f4f5c | 34 | ngAfterViewChecked () { |
ad453580 C |
35 | if (this.checkScroll) { |
36 | this.checkScroll = false | |
37 | ||
617f4f5c C |
38 | // Wait HTML update |
39 | setTimeout(() => { | |
40 | if (this.hasScroll() === false) this.nearOfBottom.emit() | |
41 | }) | |
ad453580 C |
42 | } |
43 | } | |
44 | ||
0cd4344f | 45 | ngOnInit () { |
dd24f1bb | 46 | this.initialize() |
0cd4344f C |
47 | } |
48 | ||
9af61e84 C |
49 | ngOnDestroy () { |
50 | if (this.scrollDownSub) this.scrollDownSub.unsubscribe() | |
9af61e84 C |
51 | } |
52 | ||
0cd4344f | 53 | initialize () { |
ad453580 C |
54 | this.container = this.onItself |
55 | ? this.el.nativeElement | |
56 | : document.documentElement | |
bce47964 | 57 | |
6a6d92b1 | 58 | // Emit the last value |
2c6bbd97 | 59 | const throttleOptions = { leading: true, trailing: true } |
6a6d92b1 | 60 | |
ad453580 C |
61 | const scrollableElement = this.onItself ? this.container : window |
62 | const scrollObservable = fromEvent(scrollableElement, 'scroll') | |
db400f44 | 63 | .pipe( |
14aa8556 | 64 | startWith(true), |
db400f44 | 65 | throttleTime(200, undefined, throttleOptions), |
bce47964 | 66 | map(() => this.getScrollInfo()), |
db400f44 C |
67 | distinctUntilChanged((o1, o2) => o1.current === o2.current), |
68 | share() | |
69 | ) | |
0cd4344f C |
70 | |
71 | // Scroll Down | |
9af61e84 | 72 | this.scrollDownSub = scrollObservable |
db400f44 | 73 | .pipe( |
ad453580 C |
74 | filter(({ current }) => this.isScrollingDown(current)), |
75 | filter(({ current, maximumScroll }) => (current / maximumScroll) > this.decimalLimit) | |
db400f44 | 76 | ) |
dd24f1bb | 77 | .subscribe(() => { |
0af2a8c5 | 78 | if (this.setAngularState && !this.parentDisabled) this.setScrollRouteParams() |
dd24f1bb C |
79 | |
80 | this.nearOfBottom.emit() | |
81 | }) | |
ad453580 C |
82 | |
83 | if (this.dataObservable) { | |
84 | this.dataObservable | |
85 | .pipe(filter(d => d.length !== 0)) | |
86 | .subscribe(() => this.checkScroll = true) | |
87 | } | |
6a6d92b1 | 88 | } |
bce47964 C |
89 | |
90 | private getScrollInfo () { | |
ad453580 C |
91 | return { current: this.container.scrollTop, maximumScroll: this.getMaximumScroll() } |
92 | } | |
93 | ||
94 | private getMaximumScroll () { | |
d142c7b9 C |
95 | const elementHeight = this.onItself ? this.container.clientHeight : window.innerHeight |
96 | ||
97 | return this.container.scrollHeight - elementHeight | |
ad453580 C |
98 | } |
99 | ||
100 | private hasScroll () { | |
101 | return this.getMaximumScroll() > 0 | |
102 | } | |
103 | ||
104 | private isScrollingDown (current: number) { | |
105 | const result = this.lastCurrentBottom < current | |
bce47964 | 106 | |
ad453580 C |
107 | this.lastCurrentBottom = current |
108 | return result | |
bce47964 | 109 | } |
dd24f1bb C |
110 | |
111 | private setScrollRouteParams () { | |
112 | this.peertubeRouter.addRouteSetting(RouterSetting.REUSE_COMPONENT) | |
113 | } | |
0cd4344f | 114 | } |