QML 命名空间
QML 命名空间是一种特殊的类型，它只公开枚举，不能实例化。命名空间只能在 C++ 中声明，在标有Q_NAMESPACE 的 C++ 命名空间内使用QML_ELEMENT 或QML_NAMED_ELEMENT 宏。
QML 命名空间可用于从其他类型中提取枚举。
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