Scene窗口拓展

前提：需要在窗口监听事件

[ InitializeOnLoadMethod ]

作用及描述：允许在 Unity 加载时初始化编辑器类方法，无需用户操作。（初始化时调用）
=>的作用：https://blog.csdn.net/qq_40544338/article/details/103599590

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
public class TestScene : MonoBehaviour
{
    //使用SceneView类
    [InitializeOnLoadMethod]
    static void IntiallizeOnLoad()
    {
        UnityEditor.SceneView.duringSceneGui += (sceneView) =>
        {
            if (Event.current != null && Event.current.button == 1 && Event.current.type == EventType.MouseUp) 
            {
                Debug.Log("鼠标抬起");
                Rect position = new Rect(Event.current.mousePosition.x,Event.current.mousePosition.y-100, 100, 100);
                GUIContent[] contents = new GUIContent[] { new GUIContent("Test1"), new GUIContent("Test2") };
                EditorUtility.DisplayCustomMenu(position, contents,-1,(data,opt,select) => {
                    Debug.LogFormat("data:{0},opt:{1},select:{2},value:{3}", data, opt, select, opt[select]);
                },null);
                Event.current.Use();
            }
        };
    }
}

Scene视图Gizoms

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
public class TestSceneGizmos : MonoBehaviour
{
    //在Editor一般不编译，所以需要将文件转移到其他地方
    //实现场景中绘制内容
    public Color color;
#if UNITY_EDITOR //只能在Editor编译
    private void OnDrawGizmosSelected()//仅选中绘制
    {
        Gizmos.color = color;
        Gizmos.DrawLine(transform.position, transform.position + Vector3.up);
        Gizmos.DrawSphere(transform.position, 1);
    }
    private void OnDrawGizmos()//不选中也绘制
    {
       Gizmos.DrawIcon(transform.position, "Assets/Texture/logo.png");
    }
#endif
}

Scene视图添加UI

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEditor;
[CustomEditor(typeof(TestSceneGizmos))]
public class TestSceneGUI : Editor
{
    private void OnSceneGUI()
    {
        Handles.BeginGUI();
        if (GUILayout.Button("Click Here",GUILayout.Width(100) ))
        {
            Debug.Log(target.name);
        }
        GUILayout.Label(target.name);
        Handles.EndGUI();
    }  
}

Scene常驻UI

    [InitializeOnLoadMethod]
    static void InitializeOnLoad()
    {
        SceneView.duringSceneGui += (sceneView) =>
        {
            Handles.BeginGUI();
            if(GUILayout.Button("test2",GUILayout.Width(200))){
                Debug.Log("test2");
            }
            GUILayout.Label("固定UI");
            Handles.EndGUI();
        };
    }