From 0a95900c555880b32936a97af02f78533d6a6e35 Mon Sep 17 00:00:00 2001
From: lagaffe <>
Date: Sun, 19 Apr 2026 13:26:59 +0200
Subject: [PATCH] add class for keyboard events

---
 src/common/index.js          |  1 +
 src/common/keyBoardEvents.js | 46 ++++++++++++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)
 create mode 100644 src/common/keyBoardEvents.js

diff --git a/src/common/index.js b/src/common/index.js
index aaea758..a0a301e 100644
--- a/src/common/index.js
+++ b/src/common/index.js
@@ -1,3 +1,4 @@
 export { backgroundLayout } from "./layouts";
 export { makeDragable, makeUnDragable } from "./dragAndDrop";
 export { getIntersection } from "./helpers";
+export { KeyBoardListener } from "./keyBoardEvents";
diff --git a/src/common/keyBoardEvents.js b/src/common/keyBoardEvents.js
new file mode 100644
index 0000000..c8020df
--- /dev/null
+++ b/src/common/keyBoardEvents.js
@@ -0,0 +1,46 @@
+export class KeyBoardListener {
+    static _listenersKeyUp = {};
+    static _listenersKeyDown = {};
+    static ready = false;
+    static _listenCount = 0;
+    static init() {
+        document.addEventListener("keydown", (event) => {
+            for (const listener of Object.values(
+                KeyBoardListener._listenersKeyDown,
+            )) {
+                listener(event);
+            }
+        });
+        document.addEventListener("keyup", (event) => {
+            for (const listener of Object.values(
+                KeyBoardListener._listenersKeyUp,
+            )) {
+                listener(event);
+            }
+        });
+
+        KeyBoardListener.ready = true;
+    }
+
+    /* return id used to remove the listener */
+    static onKeyDown(callback) {
+        const id = KeyBoardListener._listenCount++;
+        KeyBoardListener._listenersKeyDown[id] = callback;
+        return id;
+    }
+
+    static offKeyDown(id) {
+        delete KeyBoardListener._listenersKeyDown[id];
+    }
+
+    /* return id used to remove the listener */
+    static onKeyUp(callback) {
+        const id = KeyBoardListener._listenCount++;
+        KeyBoardListener._listenersKeyUp[id] = callback;
+        return id;
+    }
+
+    static offKeyUp(id) {
+        delete KeyBoardListener._listenersKeyUp[id];
+    }
+}