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Unity Engine

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Unity Engine

LeftCustomContainer

Gets the left-aligned VisualElement container to the right of the HierarchyViewItem.Name.
Read time 1 minuteLast updated 11 days ago

Definition

  • Type: Property
  • Namespace: Unity.Hierarchy
  • Assembly: UnityEngine.HierarchyModule
public VisualElement LeftCustomContainer { get; }

Remarks

The following example displays how many children each collapsed item has in the Hierarchy window. It uses 
LeftCustomContainer
to host a 
Label
that shows the number of child nodes in parentheses next to any collapsed item. To use this example, save the script in a folder called 
Assets/Editor/CountWhenCollapsed
. Scripts in an 
Editor
folder can use the Hierarchy module API without additional setup. If you save the script outside of an 
Editor
folder, you must enable the Hierarchy built-in module in the Package Manager window, which also adds the module to your Player builds.

Examples

using Unity.Hierarchy;using Unity.Hierarchy.Editor;using UnityEditor;using UnityEngine.UIElements;namespace Unity.HierarchySamples.Editor{    class CountWhenCollapsed    {        const string k_ChildrenCountUssClassName = "hierarchy-children-count";        [InitializeOnLoadMethod]        static void Initialize()        {            HierarchyWindow.BindViewItem += OnBindViewItem;        }        static void OnBindViewItem(HierarchyWindow window, HierarchyView view, HierarchyViewItem item)        {            HierarchyNode node = item.Node;            int childrenCount = view.ViewModel.GetChildrenCount(node);            Label label = item.LeftCustomContainer.Q<Label>(className: k_ChildrenCountUssClassName);            if (childrenCount > 0 && view.ViewModel.DoesNotHaveFlags(node, HierarchyNodeFlags.Expanded))            {                if (label == null)                {                    label = new Label();                    label.AddToClassList(k_ChildrenCountUssClassName);                    item.LeftCustomContainer.Add(label);                }                label.text = $"({childrenCount})";                label.style.display = DisplayStyle.Flex;            }            else            {                if (label != null)                    label.style.display = DisplayStyle.None;            }        }    }}