https://docs.rs/iced_native/0.2.2/src/iced_native/widget/column.rs.html#17-26

A Column will try to fill the horizontal space of its container.

However Column::new uses Shrink by default.

Column {
            spacing: 0,
            padding: 0,
            width: Length::Shrink,
...

建议使用ConcurrentHashMap
eg:private final Map<Class, ObjectParamMetadata> classToMetadata = new ConcurrentHashMap, ObjectParamMetadata>();

此处s是否可