diff options
Diffstat (limited to 'client/src/app/shared/video/abstract-video-list.ts')
-rw-r--r-- | client/src/app/shared/video/abstract-video-list.ts | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/client/src/app/shared/video/abstract-video-list.ts b/client/src/app/shared/video/abstract-video-list.ts new file mode 100644 index 000000000..ba1635a18 --- /dev/null +++ b/client/src/app/shared/video/abstract-video-list.ts | |||
@@ -0,0 +1,133 @@ | |||
1 | import { OnInit } from '@angular/core' | ||
2 | import { ActivatedRoute, Router } from '@angular/router' | ||
3 | import { NotificationsService } from 'angular2-notifications' | ||
4 | import { Observable } from 'rxjs/Observable' | ||
5 | import { SortField } from './sort-field.type' | ||
6 | import { VideoPagination } from './video-pagination.model' | ||
7 | import { Video } from './video.model' | ||
8 | |||
9 | export abstract class AbstractVideoList implements OnInit { | ||
10 | pagination: VideoPagination = { | ||
11 | currentPage: 1, | ||
12 | itemsPerPage: 25, | ||
13 | totalItems: null | ||
14 | } | ||
15 | sort: SortField = '-createdAt' | ||
16 | defaultSort: SortField = '-createdAt' | ||
17 | videos: Video[] = [] | ||
18 | loadOnInit = true | ||
19 | |||
20 | protected notificationsService: NotificationsService | ||
21 | protected router: Router | ||
22 | protected route: ActivatedRoute | ||
23 | |||
24 | protected abstract currentRoute: string | ||
25 | |||
26 | abstract titlePage: string | ||
27 | private loadedPages: { [ id: number ]: boolean } = {} | ||
28 | |||
29 | abstract getVideosObservable (): Observable<{ videos: Video[], totalVideos: number}> | ||
30 | |||
31 | ngOnInit () { | ||
32 | // Subscribe to route changes | ||
33 | const routeParams = this.route.snapshot.params | ||
34 | this.loadRouteParams(routeParams) | ||
35 | |||
36 | if (this.loadOnInit === true) this.loadMoreVideos('after') | ||
37 | } | ||
38 | |||
39 | onNearOfTop () { | ||
40 | if (this.pagination.currentPage > 1) { | ||
41 | this.previousPage() | ||
42 | } | ||
43 | } | ||
44 | |||
45 | onNearOfBottom () { | ||
46 | if (this.hasMoreVideos()) { | ||
47 | this.nextPage() | ||
48 | } | ||
49 | } | ||
50 | |||
51 | reloadVideos () { | ||
52 | this.videos = [] | ||
53 | this.loadedPages = {} | ||
54 | this.loadMoreVideos('before') | ||
55 | } | ||
56 | |||
57 | loadMoreVideos (where: 'before' | 'after') { | ||
58 | if (this.loadedPages[this.pagination.currentPage] === true) return | ||
59 | |||
60 | const observable = this.getVideosObservable() | ||
61 | |||
62 | observable.subscribe( | ||
63 | ({ videos, totalVideos }) => { | ||
64 | // Paging is too high, return to the first one | ||
65 | if (this.pagination.currentPage > 1 && totalVideos <= ((this.pagination.currentPage - 1) * this.pagination.itemsPerPage)) { | ||
66 | this.pagination.currentPage = 1 | ||
67 | this.setNewRouteParams() | ||
68 | return this.reloadVideos() | ||
69 | } | ||
70 | |||
71 | this.loadedPages[this.pagination.currentPage] = true | ||
72 | this.pagination.totalItems = totalVideos | ||
73 | |||
74 | if (where === 'before') { | ||
75 | this.videos = videos.concat(this.videos) | ||
76 | } else { | ||
77 | this.videos = this.videos.concat(videos) | ||
78 | } | ||
79 | }, | ||
80 | error => this.notificationsService.error('Error', error.text) | ||
81 | ) | ||
82 | } | ||
83 | |||
84 | protected hasMoreVideos () { | ||
85 | // No results | ||
86 | if (this.pagination.totalItems === 0) return false | ||
87 | |||
88 | // Not loaded yet | ||
89 | if (!this.pagination.totalItems) return true | ||
90 | |||
91 | const maxPage = this.pagination.totalItems / this.pagination.itemsPerPage | ||
92 | return maxPage > this.pagination.currentPage | ||
93 | } | ||
94 | |||
95 | protected previousPage () { | ||
96 | this.pagination.currentPage-- | ||
97 | |||
98 | this.setNewRouteParams() | ||
99 | this.loadMoreVideos('before') | ||
100 | } | ||
101 | |||
102 | protected nextPage () { | ||
103 | this.pagination.currentPage++ | ||
104 | |||
105 | this.setNewRouteParams() | ||
106 | this.loadMoreVideos('after') | ||
107 | } | ||
108 | |||
109 | protected buildRouteParams () { | ||
110 | // There is always a sort and a current page | ||
111 | const params = { | ||
112 | sort: this.sort, | ||
113 | page: this.pagination.currentPage | ||
114 | } | ||
115 | |||
116 | return params | ||
117 | } | ||
118 | |||
119 | protected loadRouteParams (routeParams: { [ key: string ]: any }) { | ||
120 | this.sort = routeParams['sort'] as SortField || this.defaultSort | ||
121 | |||
122 | if (routeParams['page'] !== undefined) { | ||
123 | this.pagination.currentPage = parseInt(routeParams['page'], 10) | ||
124 | } else { | ||
125 | this.pagination.currentPage = 1 | ||
126 | } | ||
127 | } | ||
128 | |||
129 | protected setNewRouteParams () { | ||
130 | const routeParams = this.buildRouteParams() | ||
131 | this.router.navigate([ this.currentRoute, routeParams ]) | ||
132 | } | ||
133 | } | ||