[feat] add HarmonyOS desktop and mobile clients，issue #117

apps/harmony/desktop-port/keyboard_hook.h

@@ -0,0 +1,31 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-10-15
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _KEYBOARD_HOOK_H_
+#define _KEYBOARD_HOOK_H_
+
+#include "device_controller.h"
+#include <multimodalinput/oh_input_manager.h>
+
+namespace crossdesk::harmony::desktop {
+// Process-wide OS hook; the shared SessionDeviceManager owns when it runs.
+// ArkUI updates focus immediately, even while the Slint thread waits for an OS
+// service. A late callback must never capture input for another application.
+void SetKeyboardFocus(int window, bool active);
+void SetKeyboardHookPermission(bool granted);
+bool KeyboardHookPermissionGranted();
+class KeyboardHook {
+ public:
+  ~KeyboardHook();
+  int Start(OnKeyAction callback, void* context);
+  int Stop();
+  bool Active() const;
+ private:
+  static void Receive(const Input_KeyEvent* event);
+};
+}
+
+#endif