Set Unity Layout on Play Mode State Change

gistfile1.txt

  private const string LastLayout = "Library/LastEditModeLayout.wlt";

  private delegate void SaveWindowLayoutDelegate(string path);
  private static SaveWindowLayoutDelegate _saveWindowLayout;

  [InitializeOnLoadMethod]
  private static void Init()
  {
      var windowLayoutType = typeof(Editor).Assembly.GetType("UnityEditor.WindowLayout");
      var save = windowLayoutType.GetMethod("SaveWindowLayout", BindingFlags.Public | BindingFlags.Static);
      _saveWindowLayout = (SaveWindowLayoutDelegate)Delegate.CreateDelegate(typeof(SaveWindowLayoutDelegate), save);

      EditorApplication.playModeStateChanged += evt =>
      {
          if (!IsActive(StudioMode.Simple))
              return;

          switch (evt)
          {
              case PlayModeStateChange.ExitingEditMode:
                  _saveWindowLayout.Invoke(LastLayout);
                  break;

              case PlayModeStateChange.EnteredPlayMode:
                  EditorApplication.delayCall += () => UnityEditor.EditorUtility.LoadWindowLayout(PlayModeLayout);
                  break;

              case PlayModeStateChange.EnteredEditMode:
                  UnityEditor.EditorUtility.LoadWindowLayout(LastLayout);
                  break;
          }
      };
  }