1  export class Keyboard {
 2    private readonly keys: { [key: string]: boolean }
 3    private readonly lasts: Array<string>
 4  
 5    public constructor() {
 6      this.keys = {}
 7      this.lasts = []
 8  
 9      this.listen()
10    }
11  
12    public listen(): void {
13      document.addEventListener('keyup', this)
14      document.addEventListener('keydown', this)
15    }
16  
17    public unlisten(): void {
18      document.removeEventListener('keyup', this)
19      document.removeEventListener('keydown', this)
20    }
21  
22    public handleEvent(e: KeyboardEvent): void {
23      switch (e.type) {
24        case 'keyup':
25          this.onkeyup(e)
26          break
27        case 'keydown':
28          this.onkeydown(e)
29          break
30      }
31    }
32  
33    /**
34     * Tant que la touche est levée (non enfoncée)
35     */
36    public up(k: string): boolean {
37      return !this.keys[k]
38    }
39  
40    /**
41     * Tant que la touche est enfoncée
42     */
43    public down(k: string): boolean {
44      return this.keys[k]
45    }
46  
47    /**
48     * Lorsque la touche a été enfoncée
49     */
50    public press(k: string): boolean {
51      const v = this.keys[k]
52      this.keys[k] = false
53  
54      return v
55    }
56  
57    /**
58     * Lorsque la touche a été relâchée
59     */
60    public release(k: string): boolean {
61      const last = this.lasts[this.lasts.indexOf(k)]
62  
63      if (typeof last !== 'undefined') {
64        this.lasts.splice(this.lasts.indexOf(k), 1)
65      }
66  
67      return last === k
68    }
69  
70    private onkeyup(e: KeyboardEvent): void {
71      this.lasts.push(e.code)
72      this.keys[e.code] = false
73    }
74  
75    private onkeydown(e: KeyboardEvent): void {
76      this.keys[e.code] = true
77    }
78  }