1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
import { ElementRef, OnInit, ViewChild } from '@angular/core'
import { ActivatedRoute, Router } from '@angular/router'
import { isInMobileView } from '@app/shared/misc/utils'
import { InfiniteScrollerDirective } from '@app/shared/video/infinite-scroller.directive'
import { NotificationsService } from 'angular2-notifications'
import { Observable } from 'rxjs/Observable'
import { AuthService } from '../../core/auth'
import { ComponentPagination } from '../rest/component-pagination.model'
import { SortField } from './sort-field.type'
import { Video } from './video.model'
export abstract class AbstractVideoList implements OnInit {
private static LINES_PER_PAGE = 3
@ViewChild('videoElement') videosElement: ElementRef
@ViewChild(InfiniteScrollerDirective) infiniteScroller: InfiniteScrollerDirective
pagination: ComponentPagination = {
currentPage: 1,
itemsPerPage: 10,
totalItems: null
}
sort: SortField = '-createdAt'
defaultSort: SortField = '-createdAt'
loadOnInit = true
pageHeight: number
videoWidth = 215
videoHeight = 230
videoPages: Video[][]
protected abstract notificationsService: NotificationsService
protected abstract authService: AuthService
protected abstract router: Router
protected abstract route: ActivatedRoute
protected abstract currentRoute: string
abstract titlePage: string
protected loadedPages: { [ id: number ]: Video[] } = {}
protected otherRouteParams = {}
abstract getVideosObservable (page: number): Observable<{ videos: Video[], totalVideos: number}>
get user () {
return this.authService.getUser()
}
ngOnInit () {
// Subscribe to route changes
const routeParams = this.route.snapshot.params
this.loadRouteParams(routeParams)
if (isInMobileView()) {
this.pagination.itemsPerPage = 5
this.videoWidth = -1
}
if (this.videoWidth !== -1) {
const videosWidth = this.videosElement.nativeElement.offsetWidth
this.pagination.itemsPerPage = Math.floor(videosWidth / this.videoWidth) * AbstractVideoList.LINES_PER_PAGE
}
// Video takes all the width
if (this.videoWidth === -1) {
this.pageHeight = this.pagination.itemsPerPage * this.videoHeight
} else {
this.pageHeight = this.videoHeight * AbstractVideoList.LINES_PER_PAGE
}
if (this.loadOnInit === true) this.loadMoreVideos(this.pagination.currentPage)
}
onNearOfTop () {
this.previousPage()
}
onNearOfBottom () {
if (this.hasMoreVideos()) {
this.nextPage()
}
}
onPageChanged (page: number) {
this.pagination.currentPage = page
this.setNewRouteParams()
}
reloadVideos () {
this.loadedPages = {}
this.loadMoreVideos(this.pagination.currentPage)
}
loadMoreVideos (page: number) {
if (this.loadedPages[page] !== undefined) return
const observable = this.getVideosObservable(page)
observable.subscribe(
({ videos, totalVideos }) => {
// Paging is too high, return to the first one
if (this.pagination.currentPage > 1 && totalVideos <= ((this.pagination.currentPage - 1) * this.pagination.itemsPerPage)) {
this.pagination.currentPage = 1
this.setNewRouteParams()
return this.reloadVideos()
}
this.loadedPages[page] = videos
this.buildVideoPages()
this.pagination.totalItems = totalVideos
// Initialize infinite scroller now we loaded the first page
if (Object.keys(this.loadedPages).length === 1) {
// Wait elements creation
setTimeout(() => this.infiniteScroller.initialize(), 500)
}
},
error => this.notificationsService.error('Error', error.message)
)
}
protected hasMoreVideos () {
// No results
if (this.pagination.totalItems === 0) return false
// Not loaded yet
if (!this.pagination.totalItems) return true
const maxPage = this.pagination.totalItems / this.pagination.itemsPerPage
return maxPage > this.pagination.currentPage
}
protected previousPage () {
const min = this.minPageLoaded()
if (min > 1) {
this.loadMoreVideos(min - 1)
}
}
protected nextPage () {
this.loadMoreVideos(this.maxPageLoaded() + 1)
}
protected buildRouteParams () {
// There is always a sort and a current page
const params = {
sort: this.sort,
page: this.pagination.currentPage
}
return Object.assign(params, this.otherRouteParams)
}
protected loadRouteParams (routeParams: { [ key: string ]: any }) {
this.sort = routeParams['sort'] as SortField || this.defaultSort
if (routeParams['page'] !== undefined) {
this.pagination.currentPage = parseInt(routeParams['page'], 10)
} else {
this.pagination.currentPage = 1
}
}
protected setNewRouteParams () {
const routeParams = this.buildRouteParams()
this.router.navigate([ this.currentRoute, routeParams ])
}
protected buildVideoPages () {
this.videoPages = Object.values(this.loadedPages)
}
private minPageLoaded () {
return Math.min(...Object.keys(this.loadedPages).map(e => parseInt(e, 10)))
}
private maxPageLoaded () {
return Math.max(...Object.keys(this.loadedPages).map(e => parseInt(e, 10)))
}
}
|