TreeView

用于显示可以展开和折叠的层级数据。

IMGUI.Controls.TreeView - Unity 脚本 APIhttps://docs.unity.cn/cn/2020.3/ScriptReference/IMGUI.Controls.TreeView.html

代码示例

SimpleTreeView.cs

using System.Collections.Generic;
using UnityEditor.IMGUI.Controls;

class SimpleTreeView : TreeView
{
    public SimpleTreeView(TreeViewState treeViewState)
        : base(treeViewState)
    {
        // 每次调用 Reload 时都调用 BuildRoot，从而确保使用数据
        Reload();
    }

    protected override TreeViewItem BuildRoot()
    {
        // 此部分说明 ID 应该是唯一的。根项的深度
        // 必须为 -1，其余项的深度在此基础上递增。
        var root = new TreeViewItem { id = 0, depth = -1, displayName = "Root" };
        var allItems = new List<TreeViewItem>
            {
                new TreeViewItem {id = 1, depth = 0, displayName = "Animals"},
                new TreeViewItem {id = 2, depth = 1, displayName = "Mammals"},
                new TreeViewItem {id = 3, depth = 2, displayName = "Tiger"},
                new TreeViewItem {id = 4, depth = 2, displayName = "Elephant"},
                new TreeViewItem {id = 5, depth = 2, displayName = "Okapi"},
                new TreeViewItem {id = 6, depth = 2, displayName = "Armadillo"},
                new TreeViewItem {id = 7, depth = 1, displayName = "Reptiles"},
                new TreeViewItem {id = 8, depth = 2, displayName = "Crocodile"},
                new TreeViewItem {id = 9, depth = 2, displayName = "Lizard"},
            };

        // 用于初始化所有项的 TreeViewItem.children 和 .parent 的实用方法。
        SetupParentsAndChildrenFromDepths(root, allItems);

        return root;
    }
}

SimpleTreeViewWindow.cs

using UnityEngine;
using UnityEditor.IMGUI.Controls;
using UnityEditor;

class SimpleTreeViewWindow : EditorWindow
{
    // SerializeField 用于确保将视图状态写入窗口
    // 布局文件。这意味着只要窗口未关闭，即使重新启动 Unity，也会保持
    // 状态。如果省略该属性，仍然会序列化/反序列化状态。
    [SerializeField] TreeViewState m_TreeViewState;
    //TreeView 不可序列化，因此应该通过树数据对其进行重建。
    SimpleTreeView m_TreeView;
    SearchField m_SearchField;

    void OnEnable()
    {
        //检查是否已存在序列化视图状态（在程序集重新加载后
        // 仍然存在的状态）
        if (m_TreeViewState == null)
            m_TreeViewState = new TreeViewState();

        m_TreeView = new SimpleTreeView(m_TreeViewState);
        m_SearchField = new SearchField();
        m_SearchField.downOrUpArrowKeyPressed += m_TreeView.SetFocusAndEnsureSelectedItem;
    }

    void OnGUI()
    {
        DoToolbar();
        DoTreeView();
    }

    //搜索框
    void DoToolbar()
    {
        GUILayout.BeginHorizontal(EditorStyles.toolbar);
        GUILayout.Space(100);
        GUILayout.FlexibleSpace();
        m_TreeView.searchString = m_SearchField.OnToolbarGUI(m_TreeView.searchString);
        GUILayout.EndHorizontal();
    }

    //绘制TreeView
    void DoTreeView()
    {
        Rect rect = GUILayoutUtility.GetRect(0, 100000, 0, 100000);
        m_TreeView.OnGUI(rect);
    }

    [MenuItem("TreeView Examples/Simple Tree Window")]
    static void ShowWindow()
    {
        var window = GetWindow<SimpleTreeViewWindow>();
        window.titleContent = new GUIContent("My Window");
        window.Show();
    }
}