feat: add InputController

src/app/engine/InputController.ts

@@ -0,0 +1,36 @@
+export class InputController {
+  private pressedKeys: { [key: string]: boolean } = {};
+
+  private clickedKeys: Array<string> = [];
+
+  pushKeyPressed(key: string) {
+    this.pressedKeys[key] = true;
+  }
+
+  pushKeyReleased(key: string) {
+    delete this.pressedKeys[key];
+    if (this.clickedKeys.includes(key)) {
+      return;
+    }
+    this.clickedKeys.push(key);
+  }
+
+  registerKeyListeners() {
+    document.addEventListener('keydown', (e) => {
+      this.pushKeyPressed(e.key);
+    });
+    document.addEventListener('keyup', (e) => {
+      this.pushKeyReleased(e.key);
+    });
+  }
+
+  getPressedKeys() {
+    return this.pressedKeys;
+  }
+
+  getClickedKeys() {
+    const copy = [...this.clickedKeys];
+    this.clickedKeys = [];
+    return copy;
+  }
+}