[Init] Initial commit - NetMesh terminal manager

application/state/terminalLayoutSuppressStore.ts

@@ -0,0 +1,50 @@
+import { useSyncExternalStore } from 'react';
+
+type Listener = () => void;
+
+let suppressDepth = 0;
+const listeners = new Set<Listener>();
+let notifyRafId: number | null = null;
+
+const scheduleFrame =
+  typeof requestAnimationFrame === 'function'
+    ? requestAnimationFrame
+    : (cb: () => void) => setTimeout(cb, 0) as unknown as number;
+
+function scheduleEmit() {
+  if (notifyRafId !== null) return;
+  notifyRafId = scheduleFrame(() => {
+    notifyRafId = null;
+    listeners.forEach((listener) => listener());
+  });
+}
+
+export const terminalLayoutSuppressStore = {
+  getActive: () => suppressDepth > 0,
+
+  subscribe: (listener: Listener) => {
+    listeners.add(listener);
+    return () => listeners.delete(listener);
+  },
+
+  begin: () => {
+    suppressDepth += 1;
+    scheduleEmit();
+  },
+
+  end: () => {
+    const wasActive = suppressDepth > 0;
+    suppressDepth = Math.max(0, suppressDepth - 1);
+    if (wasActive) {
+      scheduleEmit();
+    }
+  },
+};
+
+export function useTerminalLayoutSuppressActive(): boolean {
+  return useSyncExternalStore(
+    terminalLayoutSuppressStore.subscribe,
+    terminalLayoutSuppressStore.getActive,
+    terminalLayoutSuppressStore.getActive,
+  );
+}