Refactoring: cleaning up main.ts file

src/WindowBehavior.ts

@@ -0,0 +1,38 @@
+import { type Editor } from "./main";
+
+export const installWindowBehaviors = (
+  app: Editor,
+  window: Window,
+  preventMultipleTabs: boolean = false
+) => {
+  window.addEventListener("beforeunload", () => {
+    // @ts-ignore
+    event.preventDefault();
+    // Iterate over all local files and set the candidate to the committed
+    app.currentFile().candidate = app.view.state.doc.toString();
+    app.currentFile().committed = app.view.state.doc.toString();
+    app.settings.saveApplicationToLocalStorage(app.universes, app.settings);
+    app.clock.stop();
+    return null;
+  });
+
+  if (preventMultipleTabs) {
+    localStorage.openpages = Date.now();
+    window.addEventListener(
+      "storage",
+      function (e) {
+        if (e.key == "openpages") {
+          // Listen if anybody else is opening the same page!
+          localStorage.page_available = Date.now();
+        }
+        if (e.key == "page_available") {
+          document.getElementById("all")!.classList.add("invisible");
+          alert(
+            "Topos is already opened in another tab. Close this tab now to prevent data loss."
+          );
+        }
+      },
+      false
+    );
+  }
+};