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1 | import { Injectable } from '@angular/core' | |
2 | ||
3 | @Injectable() | |
4 | export class ScreenService { | |
5 | private windowInnerWidth: number | |
6 | private lastFunctionCallTime: number | |
7 | private cacheForMs = 500 | |
8 | ||
9 | constructor () { | |
10 | this.refreshWindowInnerWidth() | |
11 | } | |
12 | ||
13 | isInSmallView () { | |
14 | return this.getWindowInnerWidth() < 800 | |
15 | } | |
16 | ||
17 | isInMobileView () { | |
18 | return this.getWindowInnerWidth() < 500 | |
19 | } | |
20 | ||
21 | isInTouchScreen () { | |
22 | return 'ontouchstart' in window || navigator.msMaxTouchPoints | |
23 | } | |
24 | ||
25 | getNumberOfAvailableMiniatures () { | |
26 | const screenWidth = this.getWindowInnerWidth() | |
27 | ||
28 | let numberOfVideos = 1 | |
29 | ||
30 | if (screenWidth > 1850) numberOfVideos = 6 | |
31 | else if (screenWidth > 1600) numberOfVideos = 5 | |
32 | else if (screenWidth > 1370) numberOfVideos = 4 | |
33 | else if (screenWidth > 1100) numberOfVideos = 3 | |
34 | else if (screenWidth > 850) numberOfVideos = 2 | |
35 | ||
36 | return numberOfVideos | |
37 | } | |
38 | ||
39 | // Cache window inner width, because it's an expensive call | |
40 | getWindowInnerWidth () { | |
41 | if (this.cacheWindowInnerWidthExpired()) this.refreshWindowInnerWidth() | |
42 | ||
43 | return this.windowInnerWidth | |
44 | } | |
45 | ||
46 | private refreshWindowInnerWidth () { | |
47 | this.lastFunctionCallTime = new Date().getTime() | |
48 | ||
49 | this.windowInnerWidth = window.innerWidth | |
50 | } | |
51 | ||
52 | private cacheWindowInnerWidthExpired () { | |
53 | if (!this.lastFunctionCallTime) return true | |
54 | ||
55 | return new Date().getTime() > (this.lastFunctionCallTime + this.cacheForMs) | |
56 | } | |
57 | } |