有没有一种方法可以将属性添加到GTK小部件/对象以存储有关它的附加信息

#include <gtk/gtk.h>

// 自定义小部件/对象的结构体
typedef struct {
  GObject parent_instance;
  gchar* custom_property;
} CustomWidget;

// 自定义小部件/对象的类型
typedef struct {
  GObjectClass parent_class;
} CustomWidgetClass;

// 定义自定义小部件/对象的宏
G_DEFINE_TYPE(CustomWidget, custom_widget, GTK_TYPE_WIDGET)

// 自定义小部件/对象的属性ID
enum {
  PROP_0,
  PROP_CUSTOM_PROPERTY
};

// 自定义小部件/对象的getter方法
static void custom_widget_get_property(GObject* object, guint prop_id, GValue* value, GParamSpec* pspec) {
  CustomWidget* self = CUSTOM_WIDGET(object);

  switch (prop_id) {
    case PROP_CUSTOM_PROPERTY:
      g_value_set_string(value, self->custom_property);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
      break;
  }
}

// 自定义小部件/对象的setter方法
static void custom_widget_set_property(GObject* object, guint prop_id, const GValue* value, GParamSpec* pspec) {
  CustomWidget* self = CUSTOM_WIDGET(object);

  switch (prop_id) {
    case PROP_CUSTOM_PROPERTY:
      g_free(self->custom_property);
      self->custom_property = g_value_dup_string(value);
      break;
    default:
      G_OBJECT_WARN_INVALID_PROPERTY_ID(object, prop_id, pspec);
      break;
  }
}

// 初始化自定义小部件/对象的方法
static void custom_widget_init(CustomWidget* self) {
  self->custom_property = NULL;
}

// 类型初始化函数
static void custom_widget_class_init(CustomWidgetClass* class) {
  GObjectClass* object_class = G_OBJECT_CLASS(class);

  object_class->get_property = custom_widget_get_property;
  object_class->set_property = custom_widget_set_property;

  // 注册自定义属性
  g_object_class_install_property(object_class, PROP_CUSTOM_PROPERTY,
    g_param_spec_string("custom-property", "Custom Property", "Custom property of the widget",
      NULL, G_PARAM_READWRITE));
}

// 创建自定义小部件/对象的实例
GtkWidget* create_custom_widget() {
  return GTK_WIDGET(g_object_new(custom_widget_get_type(), NULL));
}

int main(int argc, char* argv[]) {
  gtk_init(&argc, &argv);

  GtkWidget* window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  GtkWidget* custom_widget = create_custom_widget();

  gtk_container_add(GTK_CONTAINER(window), custom_widget);
  gtk_widget_show_all(window);

  gtk_main();

  return 0;
}