Unity Editor - Draw a button on Project Window and Find asset by GUID

ProjectFindByGuid.cs

using System;
using System.IO;
using System.Linq;
using System.Reflection;
using GameFramework.Base;
using NUnit.Framework;
using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

public class ProjectFindByGuid
{
    private static Type tProjectBrowser = Type.GetType("UnityEditor.ProjectBrowser,UnityEditor.dll");
    private static FieldInfo m_SearchFieldText = tProjectBrowser.GetField("m_SearchFieldText", BindingFlags.Instance | BindingFlags.NonPublic);

    private static IMGUIContainer _container = new IMGUIContainer(OnGUI);
    private static EditorWindow projectWindow;

    [InitializeOnLoadMethod]
    public static void OnLoad()
    {
        AssemblyReloadEvents.afterAssemblyReload += Reload;
        Reload();
    }

    private static void Reload()
    {
        EditorApplication.update -= Update;
        EditorApplication.update += Update;
    }

    private static void Update()
    {
        if (EditorApplication.isCompiling)
        {
            EditorApplication.update -= Update;
            return;
        }


        if (EditorWindow.focusedWindow != null && EditorWindow.focusedWindow.GetType() == tProjectBrowser)
        {
            projectWindow = EditorWindow.focusedWindow;
            if (!projectWindow.rootVisualElement.parent.hierarchy.Children().Contains(_container))
            {
                projectWindow.rootVisualElement.parent.hierarchy.Insert(1, _container);
                _container.StretchToParentSize();
            }
        }

        if (projectWindow != null & !string.IsNullOrEmpty(errorMsg))
        {
            projectWindow.Repaint();
        }
    }

    private static GUIContent btnTitle;
    private static GUIStyle btnStyle;
    private static GUIStyle errorStyle;
    private static string errorMsg;
    private static double errorMsgStartTime;

    static void OnGUI()
    {
        if (projectWindow == null)
        {
            return;
        }

        btnTitle = btnTitle ?? new GUIContent("搜索GUID",
            EditorGUIUtility.IconContent("d_search_icon").image);        

        btnStyle = btnStyle ?? new GUIStyle(GUI.skin.button);
        var calcSize = GUI.skin.button.CalcSize(btnTitle);

        Rect rect = new Rect(new Vector2(0, 22 - calcSize.y), calcSize);
        float xMin = 45;
        float xRight = 415;
        if (Screen.width < xMin + xRight)
        {
            rect.x = xMin;
        }
        else
        {
            rect.x = Screen.width - xRight;
        }

        var value = (string)m_SearchFieldText.GetValue(projectWindow);
        if (!string.IsNullOrEmpty(value))
        {
            if (GUI.Button(rect, btnTitle))
            {
                var assetPath = AssetDatabase.GUIDToAssetPath(value);
                if (!string.IsNullOrEmpty(assetPath))
                {
                    GUI.FocusControl(null);
                    var asset = AssetDatabase.LoadMainAssetAtPath(assetPath);
                    EditorGUIUtility.PingObject(asset);
                    Selection.activeObject = asset;
                }
                else
                {
                    errorMsg = $"未找到GUID=[{value}] 的资源，请在搜索框输入正确的GUID";
                    errorMsgStartTime = EditorApplication.timeSinceStartup;
                    Debug.LogError(errorMsg);
                }
            }
        }

        if (!string.IsNullOrEmpty(errorMsg))
        {
            var lerp = Mathf.Clamp01(1 - (float)(EditorApplication.timeSinceStartup - errorMsgStartTime - 1));

            if (lerp <= 0)
            {
                errorMsg = null;
                return;
            }

            errorStyle = errorStyle ?? "OL Ping";
            Color color = Color.white;
            color.a = lerp;
            GUI.color = color;
            GUI.backgroundColor = color;
            rect.y += 40;
            rect.size = errorStyle.CalcSize(new GUIContent(errorMsg));

            GUI.Label(rect, errorMsg, errorStyle);
        }

        GUI.backgroundColor = Color.white;
        GUI.color = Color.white;
    }
}

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