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1 | import { debounceTime } from 'rxjs/operators' | |
2 | import { ElementRef, OnDestroy, OnInit, ViewChild } from '@angular/core' | |
3 | import { ActivatedRoute, Router } from '@angular/router' | |
4 | import { Location } from '@angular/common' | |
5 | import { InfiniteScrollerDirective } from '@app/shared/video/infinite-scroller.directive' | |
6 | import { fromEvent, Observable, Subscription } from 'rxjs' | |
7 | import { AuthService } from '../../core/auth' | |
8 | import { ComponentPagination } from '../rest/component-pagination.model' | |
9 | import { VideoSortField } from './sort-field.type' | |
10 | import { Video } from './video.model' | |
11 | import { I18n } from '@ngx-translate/i18n-polyfill' | |
12 | import { ScreenService } from '@app/shared/misc/screen.service' | |
13 | import { OwnerDisplayType } from '@app/shared/video/video-miniature.component' | |
14 | import { Syndication } from '@app/shared/video/syndication.model' | |
15 | import { Notifier } from '@app/core' | |
16 | ||
17 | export abstract class AbstractVideoList implements OnInit, OnDestroy { | |
18 | private static LINES_PER_PAGE = 4 | |
19 | ||
20 | @ViewChild('videosElement') videosElement: ElementRef | |
21 | @ViewChild(InfiniteScrollerDirective) infiniteScroller: InfiniteScrollerDirective | |
22 | ||
23 | pagination: ComponentPagination = { | |
24 | currentPage: 1, | |
25 | itemsPerPage: 10, | |
26 | totalItems: null | |
27 | } | |
28 | sort: VideoSortField = '-publishedAt' | |
29 | categoryOneOf?: number | |
30 | defaultSort: VideoSortField = '-publishedAt' | |
31 | syndicationItems: Syndication[] = [] | |
32 | ||
33 | loadOnInit = true | |
34 | marginContent = true | |
35 | pageHeight: number | |
36 | videoWidth: number | |
37 | videoHeight: number | |
38 | videoPages: Video[][] = [] | |
39 | ownerDisplayType: OwnerDisplayType = 'account' | |
40 | firstLoadedPage: number | |
41 | displayModerationBlock = false | |
42 | titleTooltip: string | |
43 | ||
44 | protected baseVideoWidth = 215 | |
45 | protected baseVideoHeight = 205 | |
46 | ||
47 | protected abstract notifier: Notifier | |
48 | protected abstract authService: AuthService | |
49 | protected abstract router: Router | |
50 | protected abstract route: ActivatedRoute | |
51 | protected abstract screenService: ScreenService | |
52 | protected abstract i18n: I18n | |
53 | protected abstract location: Location | |
54 | protected abstract currentRoute: string | |
55 | abstract titlePage: string | |
56 | ||
57 | protected loadedPages: { [ id: number ]: Video[] } = {} | |
58 | protected loadingPage: { [ id: number ]: boolean } = {} | |
59 | protected otherRouteParams = {} | |
60 | ||
61 | private resizeSubscription: Subscription | |
62 | ||
63 | abstract getVideosObservable (page: number): Observable<{ videos: Video[], totalVideos: number}> | |
64 | abstract generateSyndicationList (): void | |
65 | ||
66 | get user () { | |
67 | return this.authService.getUser() | |
68 | } | |
69 | ||
70 | ngOnInit () { | |
71 | // Subscribe to route changes | |
72 | const routeParams = this.route.snapshot.queryParams | |
73 | this.loadRouteParams(routeParams) | |
74 | ||
75 | this.resizeSubscription = fromEvent(window, 'resize') | |
76 | .pipe(debounceTime(500)) | |
77 | .subscribe(() => this.calcPageSizes()) | |
78 | ||
79 | this.calcPageSizes() | |
80 | if (this.loadOnInit === true) this.loadMoreVideos(this.pagination.currentPage) | |
81 | } | |
82 | ||
83 | ngOnDestroy () { | |
84 | if (this.resizeSubscription) this.resizeSubscription.unsubscribe() | |
85 | } | |
86 | ||
87 | pageByVideoId (index: number, page: Video[]) { | |
88 | // Video are unique in all pages | |
89 | return page.length !== 0 ? page[0].id : 0 | |
90 | } | |
91 | ||
92 | videoById (index: number, video: Video) { | |
93 | return video.id | |
94 | } | |
95 | ||
96 | onNearOfTop () { | |
97 | this.previousPage() | |
98 | } | |
99 | ||
100 | onNearOfBottom () { | |
101 | if (this.hasMoreVideos()) { | |
102 | this.nextPage() | |
103 | } | |
104 | } | |
105 | ||
106 | onPageChanged (page: number) { | |
107 | this.pagination.currentPage = page | |
108 | this.setNewRouteParams() | |
109 | } | |
110 | ||
111 | reloadVideos () { | |
112 | this.loadedPages = {} | |
113 | this.loadMoreVideos(this.pagination.currentPage) | |
114 | } | |
115 | ||
116 | loadMoreVideos (page: number, loadOnTop = false) { | |
117 | this.adjustVideoPageHeight() | |
118 | ||
119 | const currentY = window.scrollY | |
120 | ||
121 | if (this.loadedPages[page] !== undefined) return | |
122 | if (this.loadingPage[page] === true) return | |
123 | ||
124 | this.loadingPage[page] = true | |
125 | const observable = this.getVideosObservable(page) | |
126 | ||
127 | observable.subscribe( | |
128 | ({ videos, totalVideos }) => { | |
129 | this.loadingPage[page] = false | |
130 | ||
131 | if (this.firstLoadedPage === undefined || this.firstLoadedPage > page) this.firstLoadedPage = page | |
132 | ||
133 | // Paging is too high, return to the first one | |
134 | if (this.pagination.currentPage > 1 && totalVideos <= ((this.pagination.currentPage - 1) * this.pagination.itemsPerPage)) { | |
135 | this.pagination.currentPage = 1 | |
136 | this.setNewRouteParams() | |
137 | return this.reloadVideos() | |
138 | } | |
139 | ||
140 | this.loadedPages[page] = videos | |
141 | this.buildVideoPages() | |
142 | this.pagination.totalItems = totalVideos | |
143 | ||
144 | // Initialize infinite scroller now we loaded the first page | |
145 | if (Object.keys(this.loadedPages).length === 1) { | |
146 | // Wait elements creation | |
147 | setTimeout(() => { | |
148 | this.infiniteScroller.initialize() | |
149 | ||
150 | // At our first load, we did not load the first page | |
151 | // Load the previous page so the user can move on the top (and browser previous pages) | |
152 | if (this.pagination.currentPage > 1) this.loadMoreVideos(this.pagination.currentPage - 1, true) | |
153 | }, 500) | |
154 | } | |
155 | ||
156 | // Insert elements on the top but keep the scroll in the previous position | |
157 | if (loadOnTop) setTimeout(() => { window.scrollTo(0, currentY + this.pageHeight) }, 0) | |
158 | }, | |
159 | error => { | |
160 | this.loadingPage[page] = false | |
161 | this.notifier.error(error.message) | |
162 | } | |
163 | ) | |
164 | } | |
165 | ||
166 | toggleModerationDisplay () { | |
167 | throw new Error('toggleModerationDisplay is not implemented') | |
168 | } | |
169 | ||
170 | protected hasMoreVideos () { | |
171 | // No results | |
172 | if (this.pagination.totalItems === 0) return false | |
173 | ||
174 | // Not loaded yet | |
175 | if (!this.pagination.totalItems) return true | |
176 | ||
177 | const maxPage = this.pagination.totalItems / this.pagination.itemsPerPage | |
178 | return maxPage > this.maxPageLoaded() | |
179 | } | |
180 | ||
181 | protected previousPage () { | |
182 | const min = this.minPageLoaded() | |
183 | ||
184 | if (min > 1) { | |
185 | this.loadMoreVideos(min - 1, true) | |
186 | } | |
187 | } | |
188 | ||
189 | protected nextPage () { | |
190 | this.loadMoreVideos(this.maxPageLoaded() + 1) | |
191 | } | |
192 | ||
193 | protected buildRouteParams () { | |
194 | // There is always a sort and a current page | |
195 | const params = { | |
196 | sort: this.sort, | |
197 | page: this.pagination.currentPage | |
198 | } | |
199 | ||
200 | return Object.assign(params, this.otherRouteParams) | |
201 | } | |
202 | ||
203 | protected loadRouteParams (routeParams: { [ key: string ]: any }) { | |
204 | this.sort = routeParams['sort'] as VideoSortField || this.defaultSort | |
205 | this.categoryOneOf = routeParams['categoryOneOf'] | |
206 | if (routeParams['page'] !== undefined) { | |
207 | this.pagination.currentPage = parseInt(routeParams['page'], 10) | |
208 | } else { | |
209 | this.pagination.currentPage = 1 | |
210 | } | |
211 | } | |
212 | ||
213 | protected setNewRouteParams () { | |
214 | const paramsObject = this.buildRouteParams() | |
215 | ||
216 | const queryParams = Object.keys(paramsObject) | |
217 | .map(p => p + '=' + paramsObject[p]) | |
218 | .join('&') | |
219 | this.location.replaceState(this.currentRoute, queryParams) | |
220 | } | |
221 | ||
222 | protected buildVideoPages () { | |
223 | this.videoPages = Object.values(this.loadedPages) | |
224 | } | |
225 | ||
226 | protected adjustVideoPageHeight () { | |
227 | const numberOfPagesLoaded = Object.keys(this.loadedPages).length | |
228 | if (!numberOfPagesLoaded) return | |
229 | ||
230 | this.pageHeight = this.videosElement.nativeElement.offsetHeight / numberOfPagesLoaded | |
231 | } | |
232 | ||
233 | protected buildVideoHeight () { | |
234 | // Same ratios than base width/height | |
235 | return this.videosElement.nativeElement.offsetWidth * (this.baseVideoHeight / this.baseVideoWidth) | |
236 | } | |
237 | ||
238 | private minPageLoaded () { | |
239 | return Math.min(...Object.keys(this.loadedPages).map(e => parseInt(e, 10))) | |
240 | } | |
241 | ||
242 | private maxPageLoaded () { | |
243 | return Math.max(...Object.keys(this.loadedPages).map(e => parseInt(e, 10))) | |
244 | } | |
245 | ||
246 | private calcPageSizes () { | |
247 | if (this.screenService.isInMobileView() || this.baseVideoWidth === -1) { | |
248 | this.pagination.itemsPerPage = 5 | |
249 | ||
250 | // Video takes all the width | |
251 | this.videoWidth = -1 | |
252 | this.videoHeight = this.buildVideoHeight() | |
253 | this.pageHeight = this.pagination.itemsPerPage * this.videoHeight | |
254 | } else { | |
255 | this.videoWidth = this.baseVideoWidth | |
256 | this.videoHeight = this.baseVideoHeight | |
257 | ||
258 | const videosWidth = this.videosElement.nativeElement.offsetWidth | |
259 | this.pagination.itemsPerPage = Math.floor(videosWidth / this.videoWidth) * AbstractVideoList.LINES_PER_PAGE | |
260 | this.pageHeight = this.videoHeight * AbstractVideoList.LINES_PER_PAGE | |
261 | } | |
262 | ||
263 | // Rebuild pages because maybe we modified the number of items per page | |
264 | const videos = [].concat(...this.videoPages) | |
265 | this.loadedPages = {} | |
266 | ||
267 | let i = 1 | |
268 | // Don't include the last page if it not complete | |
269 | while (videos.length >= this.pagination.itemsPerPage && i < 10000) { // 10000 -> Hard limit in case of infinite loop | |
270 | this.loadedPages[i] = videos.splice(0, this.pagination.itemsPerPage) | |
271 | i++ | |
272 | } | |
273 | ||
274 | // Re fetch the last page | |
275 | if (videos.length !== 0) { | |
276 | this.loadMoreVideos(i) | |
277 | } else { | |
278 | this.buildVideoPages() | |
279 | } | |
280 | ||
281 | console.log('Rebuilt pages with %s elements per page.', this.pagination.itemsPerPage) | |
282 | } | |
283 | } |