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

apps/harmony/desktop-port/window_mode.h

@@ -0,0 +1,38 @@
+/*
+ * @Author: DI JUNKUN
+ * @Date: 2026-10-15
+ * Copyright (c) 2026 by DI JUNKUN, All Rights Reserved.
+ */
+
+#ifndef _WINDOW_MODE_H_
+#define _WINDOW_MODE_H_
+
+#include <nlohmann/json.hpp>
+
+namespace crossdesk::harmony::desktop {
+// Slint setters synchronously notify the platform one property at a time.
+// A native state snapshot must be acknowledged atomically without echoing
+// those intermediate combinations back to the native compositor.
+class WindowMode {
+  nlohmann::json known_ = nlohmann::json::object();
+  bool acknowledging_ = false;
+ public:
+  nlohmann::json Request(const nlohmann::json& desired) {
+    auto changes = nlohmann::json::object();
+    if (acknowledging_) return changes;
+    for (const auto& [name, value] : desired.items())
+      if (!known_.contains(name) || known_.at(name) != value) changes[name] = value;
+    known_ = desired;
+    return changes;
+  }
+  template <typename Apply>
+  void Acknowledge(const nlohmann::json& actual, Apply apply) {
+    known_.update(actual);
+    struct Reset { bool& flag; ~Reset() { flag = false; } } reset{acknowledging_};
+    acknowledging_ = true;
+    apply();
+  }
+};
+}
+
+#endif