client/src/app/core/hotkeys/hotkeys.component.ts


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import { Hotkey, HotkeysService } from 'angular2-hotkeys'
import { Subscription } from 'rxjs'
import { Component, Input, OnDestroy, OnInit } from '@angular/core'

@Component({
  selector : 'my-hotkeys-cheatsheet',
  templateUrl : './hotkeys.component.html',
  styleUrls: [ './hotkeys.component.scss' ]
})
export class CheatSheetComponent implements OnInit, OnDestroy {
  @Input() title = $localize`Keyboard Shortcuts:`
  helpVisible = false
  subscription: Subscription

  hotkeys: Hotkey[]

  constructor (
    private hotkeysService: HotkeysService
    ) {}

  public ngOnInit (): void {
    this.subscription = this.hotkeysService.cheatSheetToggle.subscribe((isOpen) => {
      if (isOpen !== false) {
        this.hotkeys = this.hotkeysService.hotkeys.filter(hotkey => hotkey.description)
      }

      if (isOpen === false) {
        this.helpVisible = false
      } else {
        this.toggleHelpVisible()
      }
    })
  }

  public ngOnDestroy (): void {
    if (this.subscription) {
      this.subscription.unsubscribe()
    }
  }

  public toggleCheatSheet (): void {
    this.hotkeysService.cheatSheetToggle.next(!this.helpVisible)
  }

  public toggleHelpVisible (): void {
    this.helpVisible = !this.helpVisible
  }
}