Get selected scenes (in hierarchy)

How can you get the selected scenes in the hierarchy in the editor? (For a editor window that shows some information on the selected part in the hierarchy.)

The object for a scene returned from Selection.objects is null. There is an ID returned from Selection.instanceIDs, but calling EditorUtility.InstanceIDToObject with this ID returns null again. Unlike other ID's this ID seems a negative number and it doesn't seem to relate to the ID of the scene asset as far as I can tell. For example:

• Scene asset (UnityEngine.SceneAsset): 19108
• Same scene in hierarchy (null): -1074

 

Looks like instanceID maps directly to scene.handle, so to get the selected scene you could use:

Code (CSharp):

1.  
2. public static Scene GetSelectedScene()
3. {
4.     for (int index = 0; index < SceneManager.sceneCount; index++)
5.     {
6.         var scene = SceneManager.GetSceneAt(index);
7.         if (scene.handle == Selection.activeInstanceID)
8.         {
9.             return scene;
10.         }
11.     }
12.     return default;
13. }
14.