com.alicizax.unity.editor.extension/Editor/ToolBarExtension/LocalizationDropdownField.cs

using System;
using System.Linq;
using AlicizaX.Localization.Runtime;
using AlicizaX;
using AlicizaX.Localization.Editor;
using Paps.UnityToolbarExtenderUIToolkit;
using UnityEditor;
using UnityEngine;
using UnityEngine.UIElements;

[MainToolbarElement("LocalizationDropdownField", alignment: ToolbarAlign.Right, order: 0)]
public class LocalizationDropdownField : IMGUIContainer
{
    private static GUIContent appConfigBtContent;

    private static string[] _languageTypeNames;

    public void InitializeElement()
    {
        _languageTypeNames = LocalizationConfiguration.Instance.LanguageTypeNames.ToArray();

        appConfigBtContent =
            EditorGUIUtility.TrTextContentWithIcon("", "",
                "Settings");
        onGUIHandler = MyGUIMethod;
    }

    private void MyGUIMethod()
    {
        GUILayout.BeginHorizontal();
        string title = GetPrefsStr();
        appConfigBtContent.text = title;
        if (EditorGUILayout.DropdownButton(appConfigBtContent, FocusType.Passive, EditorStyles.toolbarPopup, GUILayout.MaxWidth(120)))
        {
            DrawEditorToolDropdownMenus();
        }

        GUILayout.Space(5);
        GUILayout.EndHorizontal();
    }

    static void DrawEditorToolDropdownMenus()
    {
        string langaugeName = GetPrefsStr();
        GenericMenu popMenu = new GenericMenu();
        for (int i = 0; i < _languageTypeNames.Length; i++)
        {
            var toolAttr = _languageTypeNames[i];
            var selected = langaugeName == toolAttr;
            popMenu.AddItem(new GUIContent(toolAttr), selected, menuIdx => { ClickToolsSubmenu(toolAttr); }, toolAttr);
        }

        popMenu.ShowAsContext();
    }

    static void ClickToolsSubmenu(string langaugeName)
    {
        EditorPrefs.SetString(LocalizationComponent.PrefsKey, langaugeName);
        Debug.Log(langaugeName);
    }

    static string GetPrefsStr()
    {
        return EditorPrefs.GetString(LocalizationComponent.PrefsKey, "None");
    }
}