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Lost focus handling in Dart

How to deal with lost focus in a dart? For example, if some code is running on a page and users (for example) minimize the window or switch to another tab, the current page will lose focus. Is there some method that works in this case that I can override in my code?

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import 'dart:html' as dom;
import 'dart:async';

void main() {
  dom.document.onVisibilityChange.listen(visibilityChangeHandler);
  dom.window.onFocus.listen(focusHandler);
  dom.window.onBlur.listen(blurHandler);
}

void visibilityChangeHandler(dom.Event e) {
  print('visibility changed: $e');
}

void focusHandler(dom.Event e) {
  print('focus: $e');
}

void blurHandler(dom.Event e) {
  print('blur: $e');
}


see also Is there a way to determine if a browser window is open?

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