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() {

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');


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