TEngine 6

UnityProject/Packages/YooAsset/Editor/UIElements/TreeViewer/TreeNode.cs

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+#if UNITY_2019_4_OR_NEWER
+using System.IO;
+using System.Linq;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+using UnityEditor.UIElements;
+using UnityEngine.UIElements;
+
+namespace YooAsset.Editor
+{
+    public class TreeNode
+    {
+        /// <summary>
+        /// 子节点集合
+        /// </summary>
+        public List<TreeNode> Children = new List<TreeNode>(10);
+
+        /// <summary>
+        /// 父节点
+        /// </summary>
+        public TreeNode Parent { get; set; }
+
+        /// <summary>
+        /// 用户数据
+        /// </summary>
+        public object UserData { get; set; }
+
+        /// <summary>
+        /// 是否展开
+        /// </summary>
+        public bool IsExpanded { get; set; } = false;
+
+
+        public TreeNode(object userData)
+        {
+            UserData = userData;
+        }
+
+        /// <summary>
+        /// 添加子节点
+        /// </summary>
+        public void AddChild(TreeNode child)
+        {
+            child.Parent = this;
+            Children.Add(child);
+        }
+
+        /// <summary>
+        /// 清理所有子节点
+        /// </summary>
+        public void ClearChildren()
+        {
+            foreach(var child in Children)
+            {
+                child.Parent = null;
+            }
+            Children.Clear();
+        }
+
+        /// <summary>
+        /// 计算节点的深度
+        /// </summary>
+        public int GetDepth()
+        {
+            int depth = 0;
+            TreeNode current = this;
+            while (current.Parent != null)
+            {
+                depth++;
+                current = current.Parent;
+            }
+            return depth;
+        }
+    }
+}
+#endif

UnityProject/Packages/YooAsset/Editor/UIElements/TreeViewer/TreeNode.cs.meta

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UnityProject/Packages/YooAsset/Editor/UIElements/TreeViewer/TreeViewer.cs

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+#if UNITY_2019_4_OR_NEWER
+using System;
+using System.Linq;
+using System.Collections.Generic;
+using UnityEditor;
+using UnityEngine;
+using UnityEditor.UIElements;
+using UnityEngine.UIElements;
+
+namespace YooAsset.Editor
+{
+    public class TreeViewer : VisualElement
+    {
+        public new class UxmlFactory : UxmlFactory<TreeViewer, UxmlTraits>
+        {
+        }
+
+        private readonly ListView _listView;
+        private readonly List<TreeNode> _flattenList = new List<TreeNode>(1000);
+        private readonly List<TreeNode> _rootList = new List<TreeNode>(100);
+
+        /// <summary>
+        /// 制作列表元素
+        /// </summary>
+        public Action<VisualElement> makeItem { get; set; }
+
+        /// <summary>
+        /// 绑定列表数据
+        /// </summary>
+        public Action<VisualElement, object> bindItem { get; set; }
+
+
+        public TreeViewer()
+        {
+            this.style.flexShrink = 1f;
+            this.style.flexGrow = 1f;
+
+            // 创建ListView
+            _listView = new ListView();
+            _listView.style.flexShrink = 1f;
+            _listView.style.flexGrow = 1f;
+            _listView.itemsSource = _flattenList;
+            _listView.makeItem = MakeItemInternal;
+            _listView.bindItem = BindItemInternal;
+            this.Add(_listView);
+        }
+
+        /// <summary>
+        /// 设置根节点数据
+        /// </summary>
+        public void SetRootItem(TreeNode rootNode)
+        {
+            _rootList.Add(rootNode);
+        }
+
+        /// <summary>
+        /// 设置根节点数据
+        /// </summary>
+        public void SetRootItems(List<TreeNode> rootNodes)
+        {
+            _rootList.AddRange(rootNodes);
+        }
+
+        /// <summary>
+        /// 清理数据
+        /// </summary>
+        public void ClearAll()
+        {
+            _rootList.Clear();
+        }
+
+        /// <summary>
+        /// 重新绘制视图
+        /// </summary>
+        public void RebuildView()
+        {
+            _flattenList.Clear();
+            foreach (var treeRoot in _rootList)
+            {
+                FlattenTree(treeRoot, 0);
+            }
+            _listView.Rebuild();
+        }
+
+        /// <summary>
+        /// 将树形结构扁平化为列表
+        /// </summary>
+        private void FlattenTree(TreeNode node, int depth)
+        {
+            _flattenList.Add(node);
+            if (node.IsExpanded)
+            {
+                foreach (var child in node.Children)
+                {
+                    FlattenTree(child, depth + 1);
+                }
+            }
+        }
+
+        private VisualElement MakeItemInternal()
+        {
+            var container = new VisualElement();
+            container.style.flexDirection = FlexDirection.Row;
+
+            // 折叠按钮
+            var toggle = new ToggleFoldout();
+            toggle.text = string.Empty;
+            toggle.name = "foldout";
+            toggle.style.alignSelf = Align.Center;
+            toggle.style.width = 15;
+            toggle.style.height = 15;
+            toggle.RegisterValueChangedCallback((ChangeEvent<bool> callback) =>
+            {
+                var treeNode = toggle.userData as TreeNode;
+                treeNode.IsExpanded = toggle.value;
+                RebuildView();
+            });
+            container.Add(toggle);
+
+            // 用户自定义元素
+            if (makeItem != null)
+            {
+                makeItem.Invoke(container);
+            }
+
+            return container;
+        }
+        private void BindItemInternal(VisualElement item, int index)
+        {
+            var treeNode = _flattenList[index];
+
+            // 设置折叠状态
+            var toggle = item.Q<ToggleFoldout>("foldout");
+            toggle.SetValueWithoutNotify(treeNode.IsExpanded);
+            toggle.userData = treeNode;
+            toggle.style.marginLeft = treeNode.GetDepth() * 15;
+
+            // 隐藏折叠按钮
+            if (treeNode.Children.Count == 0)
+            {
+                toggle.style.visibility = Visibility.Hidden;
+            }
+
+            // 用户自定义元素
+            if (bindItem != null)
+            {
+                bindItem.Invoke(item, treeNode.UserData);
+            }
+        }
+    }
+}
+#endif

UnityProject/Packages/YooAsset/Editor/UIElements/TreeViewer/TreeViewer.cs.meta

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