How can I use Undo for an EditorWindow?

So I have made a few custom inspectors before and used the Undo system but how do you use it for an EditorWindow when there are no objects to pass to Undo.RecordObject(), I just want to be able to undo changes to local variables.
Here is what I have

Code (CSharp):

1. namespace RapidIconUIC
2. {
3.     public class RapidIconWindow : EditorWindow
4.     {
5.         static RapidIconWindow window;
6.  
7.         public AssetList assetList;
8.         public DraggableSeparator leftSeparator, rightSeparator;
9.         public AssetGrid assetGrid;
10.         public IconEditor iconEditor;
11.  
12.         [MenuItem("Tools/RapidIcon")]
13.         static void Init()
14.         {
15.             window = (RapidIconWindow)GetWindow(typeof(RapidIconWindow), false, "RapidIcon");
16.             window.minSize = new Vector2(870, 600);
17.             window.Show();
18.         }
19.  
20.         private void OnEnable()
21.         {
22.             //A load of init stuff, including this:
23.             iconEditor = new IconEditor(assetGrid, window);
24.             iconEditor.LoadData();
25.         }
26.  
27.         private void OnDisable()
28.         {
29.             //Saves some variables to EditorPrefs
30.             iconEditor.SaveData();
31.         }
32.  
33.         void OnGUI()
34.         {
35.             if (!window)
36.                 Init();
37.  
38.             //A load of stuff including:
39.             iconEditor.Draw(window.position.width - rightSeparator.value, window);
40.         }
41.     }
42. }

Then in the IconEditor class (doesn't derive from anything), I have a bunch of variables that are changed with GUI controls e.g.

Code (CSharp):

1. void DrawTransformControls()
2.         {
3.             EditorGUI.BeginChangeCheck();
4.             Vector3 camPos = EditorGUILayout.Vector3Field("Camera Position", currentIcon.cameraPosition);
5.             //And some others
6.             if (EditorGUI.EndChangeCheck())
7.             {
8.                 Undo.RecordObject(this, "IconEditor Undo"); //Can't do this as IconEditor is not an Object
9.                 currentIcon.cameraPosition = camPos; //bad example as I'm changing another object here, but sometimes I do just change a local variable to the IconEditor class
10.                 //currentIcon also cannot be converted to an Object either anyway
11.                 UpdateIcon(currentIcon);
12.             }
13.         }

So how can I add undo functionality in this script, and others like it

Thanks

 

You can mark IconEditor as Serializable, and then pass the RapidIconWindow to the IconEditor to record that.

When doing Undo/Serialization in an Editor Window, it's the editor window itself you're serializing, as it's a ScriptableObject that Unity does some magic to. Exactly the rules for what serializes and why is undocumented and a bit esoteric, but for the most part it works as usual.

 

Thanks, I will give that a go

 

That worked, thanks a lot

 

Hello, Sir, it's been a year but I hope you can explain a little bit more about "passing the RapidIconWindow to the IconEditor"
I have a trouble in trying to implement this Undo system. My code looks like this inside the Editor:

Code (CSharp):

1. [System.Serializable]
2. [CustomEditor(typeof(ChatAsset))]
3. public class Editor_ChatAsset : Editor
4. {
5.     public override void OnInspectorGUI()
6.     {
7.         if (GUILayout.Button("Open Window"))
8.         {
9.             Window_ChatAsset.Open((ChatAsset)target);
10.         }
11.         EditorGUILayout.Space();
12.         base.OnInspectorGUI();
13.     }
14. }

If you're wondering what Window_ChatAsset.Open() does:

Code (CSharp):

1.     public static void Open(ChatAsset chatAsset)
2.     {
3.         Window_ChatAsset window = GetWindow<Window_ChatAsset>("Chat Asset Editor");
4.         window.serializedObject = new SerializedObject(chatAsset);
5.     }

I don't really understand how Undo works, and I have read many articles and threads about. Nothing works, or to put it more precise, I don't know how to make it work. Please help..

 

Is the problem not resolved yet? Try this.

Code (CSharp):

1. [Serializable]
2.     public class TestWindow : EditorWindow
3.     {
4.         [SerializeField] private float test = 0;
5.         private static TestWindow testWindow;
6.         private static SerializedObject serializedTestWindow;
7.  
8.  
9.  
10.         [MenuItem("Test/OpenTestWindow")]
11.         private static void OpenTestWindow()
12.         {
13.             testWindow = GetWindow<TestWindow>(false);
14.             serializedTestWindow = new SerializedObject(testWindow);
15.         }
16.         private void OnGUI()
17.         {
18.             Undo.RecordObject(serializedTestWindow.targetObject, "test");
19.             test = EditorGUILayout.FloatField(nameof(test), test);
20.         }
21.     }

Open window and change test property. And try undo.