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1 | import { ElementRef, OnDestroy, OnInit, ViewChild } from '@angular/core' | |
2 | import { ActivatedRoute, Router } from '@angular/router' | |
3 | import { isInMobileView } from '@app/shared/misc/utils' | |
4 | import { InfiniteScrollerDirective } from '@app/shared/video/infinite-scroller.directive' | |
5 | import { NotificationsService } from 'angular2-notifications' | |
6 | import 'rxjs/add/operator/debounceTime' | |
7 | import { Observable } from 'rxjs/Observable' | |
8 | import { fromEvent } from 'rxjs/observable/fromEvent' | |
9 | import { Subscription } from 'rxjs/Subscription' | |
10 | import { AuthService } from '../../core/auth' | |
11 | import { ComponentPagination } from '../rest/component-pagination.model' | |
12 | import { SortField } from './sort-field.type' | |
13 | import { Video } from './video.model' | |
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: SortField = '-createdAt' | |
27 | defaultSort: SortField = '-createdAt' | |
28 | loadOnInit = true | |
29 | pageHeight: number | |
30 | videoWidth: number | |
31 | videoHeight: number | |
32 | videoPages: Video[][] = [] | |
33 | ||
34 | protected baseVideoWidth = 215 | |
35 | protected baseVideoHeight = 230 | |
36 | ||
37 | protected abstract notificationsService: NotificationsService | |
38 | protected abstract authService: AuthService | |
39 | protected abstract router: Router | |
40 | protected abstract route: ActivatedRoute | |
41 | protected abstract currentRoute: string | |
42 | abstract titlePage: string | |
43 | ||
44 | protected loadedPages: { [ id: number ]: Video[] } = {} | |
45 | protected otherRouteParams = {} | |
46 | ||
47 | private resizeSubscription: Subscription | |
48 | ||
49 | abstract getVideosObservable (page: number): Observable<{ videos: Video[], totalVideos: number}> | |
50 | ||
51 | get user () { | |
52 | return this.authService.getUser() | |
53 | } | |
54 | ||
55 | ngOnInit () { | |
56 | // Subscribe to route changes | |
57 | const routeParams = this.route.snapshot.params | |
58 | this.loadRouteParams(routeParams) | |
59 | ||
60 | this.resizeSubscription = fromEvent(window, 'resize') | |
61 | .debounceTime(500) | |
62 | .subscribe(() => this.calcPageSizes()) | |
63 | ||
64 | this.calcPageSizes() | |
65 | if (this.loadOnInit === true) this.loadMoreVideos(this.pagination.currentPage) | |
66 | } | |
67 | ||
68 | ngOnDestroy () { | |
69 | if (this.resizeSubscription) this.resizeSubscription.unsubscribe() | |
70 | } | |
71 | ||
72 | onNearOfTop () { | |
73 | this.previousPage() | |
74 | } | |
75 | ||
76 | onNearOfBottom () { | |
77 | if (this.hasMoreVideos()) { | |
78 | this.nextPage() | |
79 | } | |
80 | } | |
81 | ||
82 | onPageChanged (page: number) { | |
83 | this.pagination.currentPage = page | |
84 | this.setNewRouteParams() | |
85 | } | |
86 | ||
87 | reloadVideos () { | |
88 | this.loadedPages = {} | |
89 | this.loadMoreVideos(this.pagination.currentPage) | |
90 | } | |
91 | ||
92 | loadMoreVideos (page: number) { | |
93 | if (this.loadedPages[page] !== undefined) return | |
94 | ||
95 | const observable = this.getVideosObservable(page) | |
96 | ||
97 | observable.subscribe( | |
98 | ({ videos, totalVideos }) => { | |
99 | // Paging is too high, return to the first one | |
100 | if (this.pagination.currentPage > 1 && totalVideos <= ((this.pagination.currentPage - 1) * this.pagination.itemsPerPage)) { | |
101 | this.pagination.currentPage = 1 | |
102 | this.setNewRouteParams() | |
103 | return this.reloadVideos() | |
104 | } | |
105 | ||
106 | this.loadedPages[page] = videos | |
107 | this.buildVideoPages() | |
108 | this.pagination.totalItems = totalVideos | |
109 | ||
110 | // Initialize infinite scroller now we loaded the first page | |
111 | if (Object.keys(this.loadedPages).length === 1) { | |
112 | // Wait elements creation | |
113 | setTimeout(() => this.infiniteScroller.initialize(), 500) | |
114 | } | |
115 | }, | |
116 | error => this.notificationsService.error('Error', error.message) | |
117 | ) | |
118 | } | |
119 | ||
120 | protected hasMoreVideos () { | |
121 | // No results | |
122 | if (this.pagination.totalItems === 0) return false | |
123 | ||
124 | // Not loaded yet | |
125 | if (!this.pagination.totalItems) return true | |
126 | ||
127 | const maxPage = this.pagination.totalItems / this.pagination.itemsPerPage | |
128 | return maxPage > this.maxPageLoaded() | |
129 | } | |
130 | ||
131 | protected previousPage () { | |
132 | const min = this.minPageLoaded() | |
133 | ||
134 | if (min > 1) { | |
135 | this.loadMoreVideos(min - 1) | |
136 | } | |
137 | } | |
138 | ||
139 | protected nextPage () { | |
140 | this.loadMoreVideos(this.maxPageLoaded() + 1) | |
141 | } | |
142 | ||
143 | protected buildRouteParams () { | |
144 | // There is always a sort and a current page | |
145 | const params = { | |
146 | sort: this.sort, | |
147 | page: this.pagination.currentPage | |
148 | } | |
149 | ||
150 | return Object.assign(params, this.otherRouteParams) | |
151 | } | |
152 | ||
153 | protected loadRouteParams (routeParams: { [ key: string ]: any }) { | |
154 | this.sort = routeParams['sort'] as SortField || this.defaultSort | |
155 | ||
156 | if (routeParams['page'] !== undefined) { | |
157 | this.pagination.currentPage = parseInt(routeParams['page'], 10) | |
158 | } else { | |
159 | this.pagination.currentPage = 1 | |
160 | } | |
161 | } | |
162 | ||
163 | protected setNewRouteParams () { | |
164 | const routeParams = this.buildRouteParams() | |
165 | this.router.navigate([ this.currentRoute, routeParams ]) | |
166 | } | |
167 | ||
168 | protected buildVideoPages () { | |
169 | this.videoPages = Object.values(this.loadedPages) | |
170 | } | |
171 | ||
172 | private minPageLoaded () { | |
173 | return Math.min(...Object.keys(this.loadedPages).map(e => parseInt(e, 10))) | |
174 | } | |
175 | ||
176 | private maxPageLoaded () { | |
177 | return Math.max(...Object.keys(this.loadedPages).map(e => parseInt(e, 10))) | |
178 | } | |
179 | ||
180 | private calcPageSizes () { | |
181 | if (isInMobileView() || this.baseVideoWidth === -1) { | |
182 | this.pagination.itemsPerPage = 5 | |
183 | ||
184 | // Video takes all the width | |
185 | this.videoWidth = -1 | |
186 | // Same ratios than base width/height | |
187 | this.videoHeight = this.videosElement.nativeElement.offsetWidth * (this.baseVideoHeight / this.baseVideoWidth) | |
188 | this.pageHeight = this.pagination.itemsPerPage * this.videoHeight | |
189 | } else { | |
190 | this.videoWidth = this.baseVideoWidth | |
191 | this.videoHeight = this.baseVideoHeight | |
192 | ||
193 | const videosWidth = this.videosElement.nativeElement.offsetWidth | |
194 | this.pagination.itemsPerPage = Math.floor(videosWidth / this.videoWidth) * AbstractVideoList.LINES_PER_PAGE | |
195 | this.pageHeight = this.videoHeight * AbstractVideoList.LINES_PER_PAGE | |
196 | } | |
197 | ||
198 | // Rebuild pages because maybe we modified the number of items per page | |
199 | const videos = [].concat(...this.videoPages) | |
200 | this.loadedPages = {} | |
201 | ||
202 | let i = 1 | |
203 | // Don't include the last page if it not complete | |
204 | while (videos.length >= this.pagination.itemsPerPage && i < 10000) { // 10000 -> Hard limit in case of infinite loop | |
205 | this.loadedPages[i] = videos.splice(0, this.pagination.itemsPerPage) | |
206 | i++ | |
207 | } | |
208 | ||
209 | // Re fetch the last page | |
210 | if (videos.length !== 0) { | |
211 | this.loadMoreVideos(i) | |
212 | } else { | |
213 | this.buildVideoPages() | |
214 | } | |
215 | ||
216 | console.log('Rebuilt pages with %s elements per page.', this.pagination.itemsPerPage) | |
217 | } | |
218 | } |