view/InputHandler: don't call listeners when no key state has changed

1 files changed, 8 insertions, 4 deletions

diff --git a/src/view/InputHandler.ts b/src/view/InputHandler.ts
index e39ffe0..dcfd85d 100644
--- a/src/view/InputHandler.ts
+++ b/src/view/InputHandler.ts
@@ -15,13 +15,17 @@ class InputHandler {
 
         constructor() {
                 window.addEventListener('keydown', (ev) => {
-                        this.keys[ev.keyCode] = true;
-                        this.callListeners();
+                        if (!this.keys[ev.keyCode]) {
+                                this.keys[ev.keyCode] = true;
+                                this.callListeners();
+                        }
                 });
 
                 window.addEventListener('keyup', (ev) => {
-                        delete this.keys[ev.keyCode];
-                        this.callListeners();
+                        if (this.keys[ev.keyCode]) {
+                                delete this.keys[ev.keyCode];
+                                this.callListeners();
+                        }
                 });
         }