C# class: TreeView
Namespace: UnityEngine.UIElements
Base class: BaseTreeView
The following table lists all the supported attributes.
| 名称 | 类型 | 描述 |
|---|---|---|
auto-expand |
boolean |
When true, items are automatically expanded when added to the TreeView. |
binding-path |
string |
Path of the target property to be bound. |
content-container |
string |
Returns the content container for the BaseVerticalCollectionView. Because the BaseVerticalCollectionViewcontrol automatically manages its content, this always returns null. |
fixed-item-height |
int |
The height of a single item in the list, in pixels. This property must be set when using the virtualizationMethod is set to FixedHeight, for the collection view to function. |
focusable |
boolean |
True if the element can be focused. |
name |
string |
The name of this VisualElement. Use this property to write USS selectors that target a specific element. The standard practice is to give an element a unique name. |
picking-mode |
string |
Determines if this element can be pick during mouseEvents or IPanel.Pick queries. |
reorderable |
boolean |
Gets or sets a value that indicates whether the user can drag list items to reorder them. The default values is false.Set this value to true to allow the user to drag and drop the items in the list. The collection viewprovides a default controller to allow standard behavior. It also automatically handles reordering the items in the data source. |
selection-type |
string |
Controls the selection type. The default value is SelectionType.Single.When you set the collection view to disable selections, any current selection is cleared. |
show-alternating-row-backgrounds |
string |
This property controls whether the background colors of collection view rows alternate. Takes a value from the AlternatingRowBackground enum. |
show-border |
boolean |
Enable this property to display a border around the collection view. If set to true, a border appears around the ScrollView that the collection view uses internally. |
style |
string |
Reference to the style object of this element. Contains data computed from USS files or inline styles written to this object in C#. |
tabindex |
int |
An integer used to sort focusables in the focus ring. Must be greater than or equal to zero. |
tooltip |
string |
Text to display inside an information box after the user hovers the element for a small amount of time. |
usage-hints |
string |
A combination of hint values that specify high-level intended usage patterns for the VisualElement.This property can only be set when the VisualElement is not yet part of a Panel. Once part of a Panel, this property becomes effectively read-only, and attempts to change it will throw an exception.The specification of proper UsageHints drives the system to make better decisions on how to process or accelerate certain operations based on the anticipated usage pattern.Note that those hints do not affect behavioral or visual results, but only affect the overall performance of the panel and the elements within. It’s advised to always consider specifying the proper UsageHints, but keep in mind that some UsageHints might be internally ignored under certain conditions (e.g. due to hardware limitations on the target platform). |
view-data-key |
string |
Used for view data persistence (ie. tree expanded states, scroll position, zoom level). This is the key used to save/load the view data from the view data store. Not setting this key will disable persistence for this VisualElement. |
virtualization-method |
string |
The virtualization method to use for this collection when a scroll bar is visible. Takes a value from the CollectionVirtualizationMethod enum.The default values is FixedHeight.When using fixed height, you need to specify the fixedItemHeight property.Fixed height is more performant but offers less flexibility on content. When using DynamicHeight, the collection will wait for the actual height to be computed.Dynamic height is more flexible but less performant. |