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