TreeView 的状态(展开状态、选择、滚动等)
TreeViewState 包含用户可能已更改的状态信息,例如选择状态、展开状态和滚动状态。TreeViewState 是 TreeView 中唯一应序列化/反序列化的状态。此对象在创建 TreeView 时传入,而它的保存方式由 TreeView 的客户端决定。对于 Editor 窗口,它通常是窗口中的序列化字段。当用户与 TreeView 交互时,TreeView 会更改此对象中的状态。
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