Determining which window is focused on resume

I'm trying to find out which one of my windows is focused upon resume of the app.

I have some code like this

Titanium.App.addEventListener('resume', function(e)
    {
     // do something
    });
    Titanium.addEventListener(Titanium.FOCUSED, function(event) { 
      Titanium.currentlyFocusedWindow = event.target; /// from an old post
 
  });

I've also tried

var win1 = Titanium.UI.createWindow({
        url:'fldr/window.js',
        backgroundColor:'#fff',
        barColor:LAYOUT.barColor
    });
    win1.addEventListener('focus', function(e) {
      Ti.API.info("IN THE FOCUS EVENT");
 
    });
    win1.addEventListener('open', function(e) {
      Ti.API.info("IN THE OPEN EVENT");
 
    });
    win1.addEventListener('resume', function(e) {
      Ti.API.info("IN THE RESUME EVENT");
 
    });

It seems like the resume function only works on the application module, not on a window object.

The window focus and open events are not fired upon resume of the app.

So how would i be able to determine which window has focus upon resume of the app?

We set this ourselves in a Property variable when a window gains focus. Then on resume, we can read the variable knowing what the last window opened was before the app was put into the background/asleep.

For one of our apps, we created an appstate system that allows us to reopen sub windows. It is far from perfect, but for this particular situation it works ok.