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fc11a44e | 1 | import { Injectable } from '@angular/core' |
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2 | |
3 | @Injectable() | |
4 | export class ScreenService { | |
5 | private windowInnerWidth: number | |
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6 | private lastFunctionCallTime: number |
7 | private cacheForMs = 500 | |
bbe0f064 | 8 | |
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9 | constructor () { |
10 | this.refreshWindowInnerWidth() | |
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11 | } |
12 | ||
13 | isInSmallView () { | |
8ff3f883 | 14 | return this.getWindowInnerWidth() < 800 |
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15 | } |
16 | ||
17 | isInMobileView () { | |
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18 | return this.getWindowInnerWidth() < 500 |
19 | } | |
20 | ||
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21 | isInTouchScreen () { |
22 | return 'ontouchstart' in window || navigator.msMaxTouchPoints | |
23 | } | |
24 | ||
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25 | // Cache window inner width, because it's an expensive call |
26 | private getWindowInnerWidth () { | |
27 | if (this.cacheWindowInnerWidthExpired()) this.refreshWindowInnerWidth() | |
28 | ||
29 | return this.windowInnerWidth | |
30 | } | |
31 | ||
32 | private refreshWindowInnerWidth () { | |
33 | this.lastFunctionCallTime = new Date().getTime() | |
34 | ||
35 | this.windowInnerWidth = window.innerWidth | |
36 | } | |
37 | ||
38 | private cacheWindowInnerWidthExpired () { | |
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39 | if (!this.lastFunctionCallTime) return true |
40 | ||
fc11a44e | 41 | return new Date().getTime() > (this.lastFunctionCallTime + this.cacheForMs) |
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42 | } |
43 | } |