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