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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 { NotificationsService } from 'angular2-notifications' | |
7 | import { fromEvent, Observable, Subscription } from 'rxjs' | |
8 | import { AuthService } from '../../core/auth' | |
9 | import { ComponentPagination } from '../rest/component-pagination.model' | |
10 | import { VideoSortField } from './sort-field.type' | |
11 | import { Video } from './video.model' | |
12 | import { I18n } from '@ngx-translate/i18n-polyfill' | |
13 | import { ScreenService } from '@app/shared/misc/screen.service' | |
14 | import { OwnerDisplayType } from '@app/shared/video/video-miniature.component' | |
15 | ||
16 | export abstract class AbstractVideoList implements OnInit, OnDestroy { | |
17 | private static LINES_PER_PAGE = 4 | |
18 | ||
19 | @ViewChild('videosElement') videosElement: ElementRef | |
20 | @ViewChild(InfiniteScrollerDirective) infiniteScroller: InfiniteScrollerDirective | |
21 | ||
22 | pagination: ComponentPagination = { | |
23 | currentPage: 1, | |
24 | itemsPerPage: 10, | |
25 | totalItems: null | |
26 | } | |
27 | sort: VideoSortField = '-publishedAt' | |
28 | categoryOneOf?: number | |
29 | defaultSort: VideoSortField = '-publishedAt' | |
30 | syndicationItems = [] | |
31 | ||
32 | loadOnInit = true | |
33 | marginContent = true | |
34 | pageHeight: number | |
35 | videoWidth: number | |
36 | videoHeight: number | |
37 | videoPages: Video[][] = [] | |
38 | ownerDisplayType: OwnerDisplayType = 'account' | |
39 | firstLoadedPage: number | |
40 | ||
41 | protected baseVideoWidth = 215 | |
42 | protected baseVideoHeight = 205 | |
43 | ||
44 | protected abstract notificationsService: NotificationsService | |
45 | protected abstract authService: AuthService | |
46 | protected abstract router: Router | |
47 | protected abstract route: ActivatedRoute | |
48 | protected abstract screenService: ScreenService | |
49 | protected abstract i18n: I18n | |
50 | protected abstract location: Location | |
51 | protected abstract currentRoute: string | |
52 | abstract titlePage: string | |
53 | ||
54 | protected loadedPages: { [ id: number ]: Video[] } = {} | |
55 | protected loadingPage: { [ id: number ]: boolean } = {} | |
56 | protected otherRouteParams = {} | |
57 | ||
58 | private resizeSubscription: Subscription | |
59 | ||
60 | abstract getVideosObservable (page: number): Observable<{ videos: Video[], totalVideos: number}> | |
61 | abstract generateSyndicationList () | |
62 | ||
63 | get user () { | |
64 | return this.authService.getUser() | |
65 | } | |
66 | ||
67 | ngOnInit () { | |
68 | // Subscribe to route changes | |
69 | const routeParams = this.route.snapshot.queryParams | |
70 | this.loadRouteParams(routeParams) | |
71 | ||
72 | this.resizeSubscription = fromEvent(window, 'resize') | |
73 | .pipe(debounceTime(500)) | |
74 | .subscribe(() => this.calcPageSizes()) | |
75 | ||
76 | this.calcPageSizes() | |
77 | if (this.loadOnInit === true) this.loadMoreVideos(this.pagination.currentPage) | |
78 | } | |
79 | ||
80 | ngOnDestroy () { | |
81 | if (this.resizeSubscription) this.resizeSubscription.unsubscribe() | |
82 | } | |
83 | ||
84 | pageByVideoId (index: number, page: Video[]) { | |
85 | // Video are unique in all pages | |
86 | return page[0].id | |
87 | } | |
88 | ||
89 | videoById (index: number, video: Video) { | |
90 | return video.id | |
91 | } | |
92 | ||
93 | onNearOfTop () { | |
94 | this.previousPage() | |
95 | } | |
96 | ||
97 | onNearOfBottom () { | |
98 | if (this.hasMoreVideos()) { | |
99 | this.nextPage() | |
100 | } | |
101 | } | |
102 | ||
103 | onPageChanged (page: number) { | |
104 | this.pagination.currentPage = page | |
105 | this.setNewRouteParams() | |
106 | } | |
107 | ||
108 | reloadVideos () { | |
109 | this.loadedPages = {} | |
110 | this.loadMoreVideos(this.pagination.currentPage) | |
111 | } | |
112 | ||
113 | loadMoreVideos (page: number, loadOnTop = false) { | |
114 | this.adjustVideoPageHeight() | |
115 | ||
116 | const currentY = window.scrollY | |
117 | ||
118 | if (this.loadedPages[page] !== undefined) return | |
119 | if (this.loadingPage[page] === true) return | |
120 | ||
121 | this.loadingPage[page] = true | |
122 | const observable = this.getVideosObservable(page) | |
123 | ||
124 | observable.subscribe( | |
125 | ({ videos, totalVideos }) => { | |
126 | this.loadingPage[page] = false | |
127 | ||
128 | if (this.firstLoadedPage === undefined || this.firstLoadedPage > page) this.firstLoadedPage = page | |
129 | ||
130 | // Paging is too high, return to the first one | |
131 | if (this.pagination.currentPage > 1 && totalVideos <= ((this.pagination.currentPage - 1) * this.pagination.itemsPerPage)) { | |
132 | this.pagination.currentPage = 1 | |
133 | this.setNewRouteParams() | |
134 | return this.reloadVideos() | |
135 | } | |
136 | ||
137 | this.loadedPages[page] = videos | |
138 | this.buildVideoPages() | |
139 | this.pagination.totalItems = totalVideos | |
140 | ||
141 | // Initialize infinite scroller now we loaded the first page | |
142 | if (Object.keys(this.loadedPages).length === 1) { | |
143 | // Wait elements creation | |
144 | setTimeout(() => { | |
145 | this.infiniteScroller.initialize() | |
146 | ||
147 | // At our first load, we did not load the first page | |
148 | // Load the previous page so the user can move on the top (and browser previous pages) | |
149 | if (this.pagination.currentPage > 1) this.loadMoreVideos(this.pagination.currentPage - 1, true) | |
150 | }, 500) | |
151 | } | |
152 | ||
153 | // Insert elements on the top but keep the scroll in the previous position | |
154 | if (loadOnTop) setTimeout(() => { window.scrollTo(0, currentY + this.pageHeight) }, 0) | |
155 | }, | |
156 | error => { | |
157 | this.loadingPage[page] = false | |
158 | this.notificationsService.error(this.i18n('Error'), error.message) | |
159 | } | |
160 | ) | |
161 | } | |
162 | ||
163 | protected hasMoreVideos () { | |
164 | // No results | |
165 | if (this.pagination.totalItems === 0) return false | |
166 | ||
167 | // Not loaded yet | |
168 | if (!this.pagination.totalItems) return true | |
169 | ||
170 | const maxPage = this.pagination.totalItems / this.pagination.itemsPerPage | |
171 | return maxPage > this.maxPageLoaded() | |
172 | } | |
173 | ||
174 | protected previousPage () { | |
175 | const min = this.minPageLoaded() | |
176 | ||
177 | if (min > 1) { | |
178 | this.loadMoreVideos(min - 1, true) | |
179 | } | |
180 | } | |
181 | ||
182 | protected nextPage () { | |
183 | this.loadMoreVideos(this.maxPageLoaded() + 1) | |
184 | } | |
185 | ||
186 | protected buildRouteParams () { | |
187 | // There is always a sort and a current page | |
188 | const params = { | |
189 | sort: this.sort, | |
190 | page: this.pagination.currentPage | |
191 | } | |
192 | ||
193 | return Object.assign(params, this.otherRouteParams) | |
194 | } | |
195 | ||
196 | protected loadRouteParams (routeParams: { [ key: string ]: any }) { | |
197 | this.sort = routeParams['sort'] as VideoSortField || this.defaultSort | |
198 | this.categoryOneOf = routeParams['categoryOneOf'] | |
199 | if (routeParams['page'] !== undefined) { | |
200 | this.pagination.currentPage = parseInt(routeParams['page'], 10) | |
201 | } else { | |
202 | this.pagination.currentPage = 1 | |
203 | } | |
204 | } | |
205 | ||
206 | protected setNewRouteParams () { | |
207 | const paramsObject = this.buildRouteParams() | |
208 | ||
209 | const queryParams = Object.keys(paramsObject).map(p => p + '=' + paramsObject[p]).join('&') | |
210 | this.location.replaceState(this.currentRoute, queryParams) | |
211 | } | |
212 | ||
213 | protected buildVideoPages () { | |
214 | this.videoPages = Object.values(this.loadedPages) | |
215 | } | |
216 | ||
217 | protected adjustVideoPageHeight () { | |
218 | const numberOfPagesLoaded = Object.keys(this.loadedPages).length | |
219 | if (!numberOfPagesLoaded) return | |
220 | ||
221 | this.pageHeight = this.videosElement.nativeElement.offsetHeight / numberOfPagesLoaded | |
222 | } | |
223 | ||
224 | protected buildVideoHeight () { | |
225 | // Same ratios than base width/height | |
226 | return this.videosElement.nativeElement.offsetWidth * (this.baseVideoHeight / this.baseVideoWidth) | |
227 | } | |
228 | ||
229 | private minPageLoaded () { | |
230 | return Math.min(...Object.keys(this.loadedPages).map(e => parseInt(e, 10))) | |
231 | } | |
232 | ||
233 | private maxPageLoaded () { | |
234 | return Math.max(...Object.keys(this.loadedPages).map(e => parseInt(e, 10))) | |
235 | } | |
236 | ||
237 | private calcPageSizes () { | |
238 | if (this.screenService.isInMobileView() || this.baseVideoWidth === -1) { | |
239 | this.pagination.itemsPerPage = 5 | |
240 | ||
241 | // Video takes all the width | |
242 | this.videoWidth = -1 | |
243 | this.videoHeight = this.buildVideoHeight() | |
244 | this.pageHeight = this.pagination.itemsPerPage * this.videoHeight | |
245 | } else { | |
246 | this.videoWidth = this.baseVideoWidth | |
247 | this.videoHeight = this.baseVideoHeight | |
248 | ||
249 | const videosWidth = this.videosElement.nativeElement.offsetWidth | |
250 | this.pagination.itemsPerPage = Math.floor(videosWidth / this.videoWidth) * AbstractVideoList.LINES_PER_PAGE | |
251 | this.pageHeight = this.videoHeight * AbstractVideoList.LINES_PER_PAGE | |
252 | } | |
253 | ||
254 | // Rebuild pages because maybe we modified the number of items per page | |
255 | const videos = [].concat(...this.videoPages) | |
256 | this.loadedPages = {} | |
257 | ||
258 | let i = 1 | |
259 | // Don't include the last page if it not complete | |
260 | while (videos.length >= this.pagination.itemsPerPage && i < 10000) { // 10000 -> Hard limit in case of infinite loop | |
261 | this.loadedPages[i] = videos.splice(0, this.pagination.itemsPerPage) | |
262 | i++ | |
263 | } | |
264 | ||
265 | // Re fetch the last page | |
266 | if (videos.length !== 0) { | |
267 | this.loadMoreVideos(i) | |
268 | } else { | |
269 | this.buildVideoPages() | |
270 | } | |
271 | ||
272 | console.log('Rebuilt pages with %s elements per page.', this.pagination.itemsPerPage) | |
273 | } | |
274 | } |