Unity编辑器扩展，自动选中当前场景功能。

研究了个打开build settings面板时自动选中当前场景的功能。
需求背景：起因是，目前负责的项目，是一个工程对应多个场景，每个场景隶属于一个项目，这样每次打包都需要手选要打包的场景，太麻烦了。
此方法不是最优方案，只是目前能找到的方法。

using System.Collections.Generic;
using System.IO;
using UnityEditor;
using UnityEditor.SceneManagement;
using UnityEngine;

public class BuildSettingsCallbacks : MonoBehaviour
{
    [InitializeOnLoadMethod]
    private static void Init()
    {
        // 添加Hierarchy面板进行操作时的回调
        EditorApplication.hierarchyWindowItemOnGUI += HierarchyWindowItemOnGUI;
    }

    private static void HierarchyWindowItemOnGUI(int instanceID, Rect selectionRect)
    {
        // 在HierarchyWindow面板出发了鼠标点击
        if (Event.current.type == EventType.MouseDown)
        {
            // 执行的回调操作
            AddCurrentSceneToBuild();
        }
    }

    private static void AddCurrentSceneToBuild()
    {

        // 获取当前场景的路径
        string scenePath = EditorSceneManager.GetActiveScene().path;
        // 添加场景到构建设置
        EditorBuildSettingsScene[] scenes = EditorBuildSettings.scenes;
        bool sceneAlreadyAdded = false;//判断当前场景是否已经在build settings列表中
        int tempIndex = 0;
        for (int i = 0; i < scenes.Length; i++)
        {
            if (scenes[i].path == scenePath)
            {
                sceneAlreadyAdded = true;
                tempIndex = i;
                break;
            }
        }

        if (!sceneAlreadyAdded)
        {
            System.Array.Resize(ref scenes, scenes.Length + 1);
            scenes[scenes.Length - 1] = new EditorBuildSettingsScene(scenePath, true);
            EditorBuildSettings.scenes = scenes;
        }
        else
        {
            EditorBuildSettingsScene[] tempScenes = EditorBuildSettings.scenes;
            for (int i = 0; i < tempScenes.Length; i++)
            {
                tempScenes[i].enabled = tempIndex == i;
            }
            EditorBuildSettings.scenes = tempScenes;
        }
        // 保存设置
        //EditorSettings.Save();

        //会调用多次
        //Debug.Log("current scene name= " + scenePath);


    }
}