如何使 Vector3 字段的行为类似于 CustomEditor 中 Transform 中的字段

Question

在下面的 gif 中，您可以看到 Vector3 字段在 Transform 和我的 MonoBehaviour 的检查器中的行为方式的区别。

这个Transform连一个CustomEditor我也是用EditorGUILayout.Vector3Field()写的。

[CustomEditor(typeof(Transform), true)]
[CanEditMultipleObjects]
public class AdvancedTransformEditor : Editor
{
    //Unity's built-in editor
    private Editor _defaultEditor;
    private Transform _transform;

    private void OnEnable()
    {
        //When this inspector is created, also create the built-in inspector
        _defaultEditor = CreateEditor(targets, Type.GetType("UnityEditor.TransformInspector, UnityEditor"));
        _transform = target as Transform;
    }

    private void OnDisable()
    {
        //When OnDisable is called, the default editor we created should be destroyed to avoid memory leakage.
        //Also, make sure to call any required methods like OnDisable
        var disableMethod = _defaultEditor.GetType().GetMethod("OnDisable", BindingFlags.Instance | BindingFlags.NonPublic | BindingFlags.Public);
        if (disableMethod != null) disableMethod.Invoke(_defaultEditor, null);
        DestroyImmediate(_defaultEditor);
    }

    public override void OnInspectorGUI()
    {
        EditorGUILayout.LabelField("Local Space", EditorStyles.boldLabel);
        _defaultEditor.OnInspectorGUI();

        serializedObject.Update();

        //Show World Space Transform
        EditorGUILayout.Space();
        EditorGUILayout.LabelField("World Space", EditorStyles.boldLabel);

        _transform.position = EditorGUILayout.Vector3Field("Position", _transform.position);

        EditorGUI.BeginDisabledGroup(true);
        EditorGUILayout.Vector3Field("Rotation", _transform.eulerAngles);
        EditorGUILayout.Vector3Field("Scale", _transform.lossyScale);
        EditorGUI.EndDisabledGroup();

        serializedObject.ApplyModifiedProperties();
    }
}

它只有在有 _defaultEditor.OnInspectorGUI(); 时才有效，所以 Unity 的原始编辑器中的 Transform 组件必须做一些不同的事情。

当我尝试在任何其他 CustomEditor 中对 MonoBehaviour

执行相同操作时

// without a CustomEditor
public class Example : MonoBehaviour
{
    public Vector3 example;
}

和

// Width the custom editor
public class ExampleMinWidth : MonoBehaviour
{
    public Vector3 example;
}

[CustomEditor(typeof(ExampleMinWidth))]
public class ExampleMinWidthEditor : Editor
{
    private SerializedProperty example;

    private void OnEnable()
    {
        example = serializedObject.FindProperty("exmaple");
    }

    public override void OnInspectorGUI()
    {
        serializedObject.Update();
        example.vector3Value = EditorGUILayout.Vector3Field("Example", example.vector3Value);

        // I tried both also simply using a PropertyField
        //EditorGUILayout.PropertyField(example);
        serializedObject.ApplyModifiedProperties();
    }
}

或跳过 AdvancedTransformEditor 中的 _defaultEditor.OnInspectorGUI(); 行 Vector3 字段会折叠到特定的 Inspector 宽度。

如何让我的字段获得与 Transform 组件相同的行为 - 不折叠但保持在同一行？

更新

我用 GUILayout.MinWidth() 试过了，但这并没有改变任何东西。

按照提示我也试过了

example.vector3Value = EditorGUILayout.Vector3Field("Example", example.vector3Value, GUILayout.ExpandHeight(false));

（也适用于 PropertyField()）但这并没有改变任何东西。

而且只是为了尝试我也用 ExpandWidth(false) ...结果不是很令人满意:D
我什至尝试了 GUILayout.MaxHeight(EditorGUIUtility.singleLineHeight) 但这使得字段仍然折叠但是 "bload"/overdraw 到下面的字段中。

Answer 1

Unity3d 有其 source code available on GitHub, where you can see the Transform 组件实现。

TransformInspector.cs:

/ Unity C# reference source
// Copyright (c) Unity Technologies. For terms of use, see
// https://unity3d.com/legal/licenses/Unity_Reference_Only_License

using UnityEngine;

namespace UnityEditor
{
    [CustomEditor(typeof(Transform))]
    [CanEditMultipleObjects]
    internal class TransformInspector : Editor
    {
        SerializedProperty m_Position;
        SerializedProperty m_Scale;
        TransformRotationGUI m_RotationGUI;

        class Contents
        {
            public GUIContent positionContent = EditorGUIUtility.TrTextContent("Position", "The local position of this GameObject relative to the parent.");
            public GUIContent scaleContent = EditorGUIUtility.TrTextContent("Scale", "The local scaling of this GameObject relative to the parent.");
            public string floatingPointWarning = LocalizationDatabase.GetLocalizedString("Due to floating-point precision limitations, it is recommended to bring the world coordinates of the GameObject within a smaller range.");
        }
        static Contents s_Contents;

        public void OnEnable()
        {
            m_Position = serializedObject.FindProperty("m_LocalPosition");
            m_Scale = serializedObject.FindProperty("m_LocalScale");

            if (m_RotationGUI == null)
                m_RotationGUI = new TransformRotationGUI();
            m_RotationGUI.OnEnable(serializedObject.FindProperty("m_LocalRotation"), EditorGUIUtility.TrTextContent("Rotation", "The local rotation of this GameObject relative to the parent."));
        }

        public override void OnInspectorGUI()
        {
            if (s_Contents == null)
                s_Contents = new Contents();

            if (!EditorGUIUtility.wideMode)
            {
                EditorGUIUtility.wideMode = true;
                EditorGUIUtility.labelWidth = EditorGUIUtility.currentViewWidth - 212;
            }

            serializedObject.Update();

            Inspector3D();
            // Warning if global position is too large for floating point errors.
            // SanitizeBounds function doesn't even support values beyond 100000
            Transform t = target as Transform;
            Vector3 pos = t.position;
            if (Mathf.Abs(pos.x) > 100000 || Mathf.Abs(pos.y) > 100000 || Mathf.Abs(pos.z) > 100000)
                EditorGUILayout.HelpBox(s_Contents.floatingPointWarning, MessageType.Warning);

            serializedObject.ApplyModifiedProperties();
        }

        private void Inspector3D()
        {
            EditorGUILayout.PropertyField(m_Position, s_Contents.positionContent);
            m_RotationGUI.RotationField();
            EditorGUILayout.PropertyField(m_Scale, s_Contents.scaleContent);
        }
    }
}

Answer 2

我在 TransformInspector

中找到了相关行

if (!EditorGUIUtility.wideMode)
{
    EditorGUIUtility.wideMode = true;
    EditorGUIUtility.labelWidth = EditorGUIUtility.currentViewWidth - 212;
}

EditorGUIUtility.wideMode 做两件事：Returns 编辑器当前是否是 widemode 和 set 此组件/下一行的编辑器是否应该像在 widemode 下一样工作。所以他们只是强制他们的字段在宽模式下仅 "be"。
之后需要使用 "fixed" EditorGUIUtility.labelWidth 即减少 3 Vectror3 字段在宽模式下的宽度（Unity 使用 212）

如何使 Vector3 字段的行为类似于 CustomEditor 中 Transform 中的字段

How to make Vector3 fields behave like the ones from Transform in a CustomEditor

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custom-controls

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unity-editor