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-rw-r--r--src/view/input/inputhandler.ts39
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);
+ }
+}