[Init] Initial commit - NetMesh terminal manager

components/terminal/runtime/win32InputMode.ts

@@ -0,0 +1,50 @@
+import type { Terminal as XTerm } from "@xterm/xterm";
+
+import type { KittyKeyboardEvent } from "./kittyKeyboardProtocol";
+
+export const dispatchWin32InputModeEvent = (
+  term: Pick<XTerm, "textarea">,
+  event: KittyKeyboardEvent,
+): boolean => {
+  const textarea = term.textarea;
+  const KeyboardEventConstructor = textarea?.ownerDocument.defaultView?.KeyboardEvent;
+  if (!textarea || !KeyboardEventConstructor) return false;
+
+  const syntheticEvent = new KeyboardEventConstructor(event.type ?? "keydown", {
+    key: event.key,
+    code: event.code,
+    location: event.location,
+    repeat: event.repeat,
+    isComposing: event.isComposing,
+    shiftKey: event.shiftKey,
+    altKey: event.altKey,
+    ctrlKey: event.ctrlKey,
+    metaKey: event.metaKey,
+    bubbles: true,
+    cancelable: true,
+  });
+  if (event.keyCode !== undefined && syntheticEvent.keyCode !== event.keyCode) {
+    Object.defineProperty(syntheticEvent, "keyCode", { value: event.keyCode });
+  }
+  if (event.getModifierState) {
+    Object.defineProperty(syntheticEvent, "getModifierState", {
+      value: (key: string) => event.getModifierState?.(key) === true,
+    });
+  }
+
+  // xterm's internal CoreBrowserTerminal focuses its textarea for key-up
+  // events. A broadcast is transport, not user focus navigation, so suppress
+  // that synchronous DOM focus side effect while the target encodes the event.
+  const ownFocus = Object.getOwnPropertyDescriptor(textarea, "focus");
+  Object.defineProperty(textarea, "focus", {
+    value: () => undefined,
+    configurable: true,
+  });
+  try {
+    textarea.dispatchEvent(syntheticEvent);
+  } finally {
+    if (ownFocus) Object.defineProperty(textarea, "focus", ownFocus);
+    else delete (textarea as HTMLTextAreaElement & { focus?: () => void }).focus;
+  }
+  return true;
+};