Showing content from https://docs.unity3d.com/Manual/sprite/../../ScriptReference/UIElements.BaseTreeViewController.html below:
Unity - Scripting API: BaseTreeViewController
CanChangeExpandedState Determines whether the item with the specified ID can be expanded or collapsed. CollapseAll Collapses all items in the tree and refreshes the view. CollapseItem Collapses the item with the specified ID, hiding its children. Allows to collapse the whole hierarchy under that item. CollapseItemByIndex Collapses the item with the specified index, hiding its children. Allows to collapse the whole hierarchy under that item. Exists Checks if an ID exists within this tree. ExpandAll Expands all items in the tree and refreshes the view. ExpandItem Expands the item with the specified ID, making its children visible. Allows to expand the whole hierarchy under that item. ExpandItemByIndex Expands the item with the specified index, making his children visible. Allows to expand the whole hierarchy under that item. GetAllItemIds Returns all item IDs that can be found in the tree, optionally specifying root IDs from where to start. GetChildIndexForId Gets the child index under the parent of the item with the specified ID. GetChildrenIds Get all children of a specific ID in the tree. GetChildrenIdsByIndex Gets the children IDs of the item with the specified index. GetIdForIndex Returns the ID for a specified index in the visible items source. GetIndentationDepth Returns the depth of the element at that ID. GetIndentationDepthByIndex Return the depth of the element at that index. GetIndexForId Returns the index in the source of the item, by ID. GetParentId Returns the parent ID of an item, by ID. GetRootItemIds Returns the root items of the tree, by IDs. GetTreeItemsCount Get the number of items in the whole tree. HasChildren Return whether the item with the specified ID has one or more child. HasChildrenByIndex Return whether the item with the specified index has one or more child. IsExpanded Return whether the item with the specified ID is expanded in the tree. IsExpandedByIndex Return whether the item with the specified index is expanded in the tree. Move Moves an item by ID, to a new parent and child index. TryRemoveItem Removes an item by id.
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