HierarchyViewModel.DoesNotHaveFlags

Parameters

Returns

bool true if none of the nodes have all of the flags set, false otherwise.

Description

Gets whether or not all of the specified flags are not set on any hierarchy node.

Parameters

Returns

bool true if all of the flags are not set, false otherwise.

Description

Gets whether or not all of the specified flags are not set on the hierarchy node.

The following example displays how many children each collapsed item has in the Hierarchy window. It uses DoesNotHaveFlags to check whether a node is collapsed and has children before adding the label to the left of the item name. 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.

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;
            }
        }
    }
}