add iot command for theme switch (#364)

main/iot/things/screen.cc

@@ -0,0 +1,38 @@
+#include "iot/thing.h"
+#include "board.h"
+#include "display/lcd_display.h"
+#include "settings.h"
+
+#include <esp_log.h>
+#include <string>
+
+#define TAG "Screen"
+
+namespace iot {
+
+// 这里仅定义 Screen 的属性和方法，不包含具体的实现
+class Screen : public Thing {
+public:
+    Screen() : Thing("Screen", "这是一个屏幕，可设置主题") {
+        // 定义设备的属性
+        properties_.AddStringProperty("theme", "主题", [this]() -> std::string {
+            auto theme = Board::GetInstance().GetDisplay()->GetTheme();
+            return theme;
+        });
+
+        // 定义设备可以被远程执行的指令
+        methods_.AddMethod("SetTheme", "设置屏幕主题", ParameterList({
+            Parameter("theme_name", "主题模式, light 或 dark", kValueTypeString, true)
+        }), [this](const ParameterList& parameters) {
+            std::string theme_name = static_cast<std::string>(parameters["theme_name"].string());
+            auto display = Board::GetInstance().GetDisplay();
+            if (display) {
+                display->SetTheme(theme_name);
+            }
+        });
+    }
+};
+
+} // namespace iot
+
+DECLARE_THING(Screen);