TreeViewItem 树的根。稍后可通过“rootItem”访问此项。
需要实现的抽象方法。默认情况下,此方法应创建 TreeViewItem 的完整树并返回根。
此方法可与 BuildRows 一起负责初始化 TreeView。可使用两种不同的方法创建 TreeView:1) 创建根和完整项树。2) 创建根和行。
方法 1 是默认选择,因为 TreeView 将自动处理行构建和上级信息等。方法 2 适用于大型数据集或经常变化的数据。有关更多信息,请参阅 BuildRows。
每个 TreeViewItem 都需要使用唯一的整数 ID(在 TreeView 中的所有项中是独一无二的)进行构建,并且对于相同的数据元素,该 ID 需要保持一致且不受展开状态影响。该 ID 用于在树中查找项,并了解选择状态、展开状态和导航。
要正确初始化 TreeView,所有 TreeViewItem 均需要初始化“parent”、“children”和“depth”属性。根据树数据模型,它可用于设置父属性和子属性或者深度属性,然后使用 SetupParentsAndChildrenFromDepths 或 SetupDepthsFromParentsAndChildren 通过一次调用为所有行设置未初始化的属性。
另请参阅:BuildRows、SetupParentsAndChildrenFromDepths、SetupDepthsFromParentsAndChildren 和 TreeViewItem。
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