diff options
Diffstat (limited to 'src/view/input/inputhandler.ts')
-rw-r--r-- | src/view/input/inputhandler.ts | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/src/view/input/inputhandler.ts b/src/view/input/inputhandler.ts new file mode 100644 index 0000000..96f15dd --- /dev/null +++ b/src/view/input/inputhandler.ts @@ -0,0 +1,39 @@ +import { Listenable } from '../../util'; + +export class InputHandler extends Listenable<[]> { + private readonly keys: Set<number> = new Set(); + + constructor(relevantKeys: Set<number>) { + super(); + + window.addEventListener('keydown', (ev) => { + if (!relevantKeys.has(ev.keyCode)) + return; + + ev.preventDefault(); + + if (this.keys.has(ev.keyCode)) + return; + + this.keys.add(ev.keyCode); + this.runListeners(); + }); + + window.addEventListener('keyup', (ev) => { + if (!relevantKeys.has(ev.keyCode)) + return; + + ev.preventDefault(); + + if (!this.keys.has(ev.keyCode)) + return; + + this.keys.delete(ev.keyCode); + this.runListeners(); + }); + } + + public has(key: number): boolean { + return this.keys.has(key); + } +} |