TreeView.useScrollView

描述

在绘制 TreeView 内容时，它是否会包含在 ScrollView 中？

启用后，将剔除 TreeView 的内容，因此不会绘制 ScrollView 之外的任何内容。如果 TreeView 包含在外部 ScrollView（例如 Inspector 窗口）中，则禁用此项会允许 TreeView 使用外部 ScrollView 执行其剔除。

using UnityEngine;

public class ExampleBehaviourScript : MonoBehaviour
{
    // This is our example list.
    public string[] exampleList;
}

要使用以下脚本，请将其添加到 Editor 目录。

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

// Simple TreeView that draws a single list property.
class NewBehaviourScriptEditorTreeView : TreeView
{
    SerializedProperty m_Property;

    public NewBehaviourScriptEditorTreeView(SerializedProperty property) :
        base(new TreeViewState())
    {
        m_Property = property;
        showBorder = true;
        showAlternatingRowBackgrounds = true;
        useScrollView = false; // We are using the Inspector ScrollView

        MultiColumnHeaderState.Column[] columns = new MultiColumnHeaderState.Column[2];
        for (int i = 0; i < columns.Length; ++i)
        {
            columns[i] = new MultiColumnHeaderState.Column();
            columns[i].minWidth = 50;
            columns[i].width = 100;
            columns[i].headerTextAlignment = TextAlignment.Center;
            columns[i].canSort = false;
        }
        columns[0].headerContent = new GUIContent("Index");
        columns[1].headerContent = new GUIContent("Value");
        var multiColState = new MultiColumnHeaderState(columns);
        multiColumnHeader = new MultiColumnHeader(multiColState);
        multiColumnHeader.ResizeToFit();
        Reload();
    }

    protected override TreeViewItem BuildRoot()
    {
        int arraySize = m_Property.arraySize;

        var root = new TreeViewItem { id = -1, depth = -1, displayName = "Root" };
        var allItems = new List<TreeViewItem>(arraySize);
        for (int i = 0; i < arraySize; ++i)
        {
            var item = new TreeViewItem(i, 0, i.ToString());
            allItems.Add(item);
        }

        SetupParentsAndChildrenFromDepths(root, allItems);
        return root;
    }

    protected override void RowGUI(RowGUIArgs args)
    {
        var prop = m_Property.GetArrayElementAtIndex(args.item.id);
        for (int i = 0; i < args.GetNumVisibleColumns(); ++i)
        {
            int col = args.GetColumn(i);
            var rect = args.GetCellRect(i);

            if (col == 0)
            {
                GUI.Label(rect, args.row.ToString());
            }
            else
            {
                EditorGUI.PropertyField(rect, prop, GUIContent.none);
            }
        }
    }
}

// Shows how we can use a TreeView to draw a large list of items.
[CustomEditor(typeof(ExampleBehaviourScript))]
[CanEditMultipleObjects]
public class NewBehaviourScriptEditor : Editor
{
    NewBehaviourScriptEditorTreeView m_TreeView;
    SerializedProperty m_Size;

    void OnEnable()
    {
        var listProperty = serializedObject.FindProperty("exampleList");
        m_Size = serializedObject.FindProperty("exampleList.Array.size");
        m_TreeView = new NewBehaviourScriptEditorTreeView(listProperty);
        Undo.undoRedoPerformed += m_TreeView.Reload;
    }

    void OnDisable()
    {
        if (m_TreeView != null)
            Undo.undoRedoPerformed -= m_TreeView.Reload;
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();
        EditorGUI.BeginChangeCheck();
        int newSize = EditorGUILayout.IntField("Size", m_Size.intValue);
        if (EditorGUI.EndChangeCheck())
        {
            m_Size.intValue = newSize;
            m_TreeView.Reload();
        }

        var rect = EditorGUILayout.GetControlRect(false, m_TreeView.totalHeight);
        m_TreeView.OnGUI(rect);
        serializedObject.ApplyModifiedProperties();
    }
}