knowing when Animation Window is in record mode in script?

How can I know when the editor's animation window is in record mode in a script?

I need this for the script I created here that allows to sync the preview of an animation + particle system:
https://forum.unity.com/threads/tool-animating-particle-systems-easily.546768/

 

There doesn't appear to be any canonical way to do this, but it can be done with reflection if you don't mind the performance hit:

Code (CSharp):

1.  
2. bool isAnimWindowRecording ()
3. {
4.    System.Reflection.Assembly editorAssembly = typeof (Editor).Assembly;
5.  
6.    System.Type windowType = editorAssembly.GetType
7.        ("UnityEditorInternal.AnimationWindowState");
8.  
9.    // Get a reference to the unbound property we want to access.
10.    System.Reflection.PropertyInfo isRecordingProp = windowType.GetProperty
11.        ("recording", System.Reflection.BindingFlags.Instance |
12.        System.Reflection.BindingFlags.Public);
13.  
14.    // Get all instances of objects of type "AnimationWindowState"
15.    // (There should be exactly one of these, unless the window is closed)
16.    Object [] windowInstances = Resources.FindObjectsOfTypeAll (windowType);
17.  
18.    for (int i = 0; i < windowInstances.Length; i++)
19.    {
20.        bool isRecording = (bool) isRecordingProp.GetValue
21.            (windowInstances [i], null);
22.  
23.        //Debug.Log ("isRec: " + isRecording);
24.  
25.        return isRecording;
26.    }
27.  
28.    // No instances found, so we'll presume the window is closed.
29.    return false;
30. }
31.  

Disclamer: this code leverages unity's internal api which is not intended to be accessed this way, and could change without warning at any point.