mirror of https://github.com/Chocobozzz/PeerTube
93 lines
3.1 KiB
TypeScript
93 lines
3.1 KiB
TypeScript
import * as debug from 'debug'
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import { pairwise } from 'rxjs'
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import { ViewportScroller } from '@angular/common'
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import { Injectable } from '@angular/core'
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import { RouterSetting } from '../'
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import { PeerTubeRouterService } from './peertube-router.service'
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import { logger } from '@root-helpers/logger'
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const debugLogger = debug('peertube:main:ScrollService')
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@Injectable()
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export class ScrollService {
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private resetScroll = true
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constructor (
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private viewportScroller: ViewportScroller,
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private peertubeRouter: PeerTubeRouterService
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) { }
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enableScrollRestoration () {
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// We'll manage scroll restoration ourselves
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this.viewportScroller.setHistoryScrollRestoration('manual')
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this.consumeScroll()
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this.produceScroll()
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}
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private produceScroll () {
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// When we add the a-state parameter, we don't want to alter the scroll
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this.peertubeRouter.getNavigationEndEvents().pipe(pairwise())
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.subscribe(([ e1, e2 ]) => {
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try {
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this.resetScroll = false
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const previousUrl = new URL(window.location.origin + e1.urlAfterRedirects)
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const nextUrl = new URL(window.location.origin + e2.urlAfterRedirects)
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if (previousUrl.pathname !== nextUrl.pathname) {
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this.resetScroll = true
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return
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}
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if (this.peertubeRouter.hasRouteSetting(RouterSetting.DISABLE_SCROLL_RESTORE)) {
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this.resetScroll = false
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return
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}
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// Remove route settings from the comparison
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const nextSearchParams = nextUrl.searchParams
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nextSearchParams.delete(PeerTubeRouterService.ROUTE_SETTING_NAME)
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const previousSearchParams = previousUrl.searchParams
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nextSearchParams.sort()
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previousSearchParams.sort()
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if (nextSearchParams.toString() !== previousSearchParams.toString()) {
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this.resetScroll = true
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}
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} catch (err) {
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logger.error('Cannot parse URL to check next scroll.', err)
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this.resetScroll = true
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}
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})
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}
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private consumeScroll () {
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// Handle anchors/restore position
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this.peertubeRouter.getScrollEvents().subscribe(e => {
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debugLogger('Will schedule scroll after router event %o.', { e, resetScroll: this.resetScroll })
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// scrollToAnchor first to preserve anchor position when using history navigation
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if (e.anchor) {
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setTimeout(() => this.viewportScroller.scrollToAnchor(e.anchor))
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return
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}
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if (e.position) {
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setTimeout(() => this.viewportScroller.scrollToPosition(e.position))
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return
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}
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if (this.resetScroll) {
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return this.viewportScroller.scrollToPosition([ 0, 0 ])
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}
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})
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}
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}
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