Want to listen focus change in flutter? Here is fully correct answer. addListener shall be in initState(), not build(), because that would result in adding a listener every time a widget is built and you most likely don’t want that.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | class _SomeWidgetState extends State<SomeWidget> { final FocusNode _focusNode = FocusNode(); @override void initState() { super.initState(); _focusNode.addListener(() { print("Has focus: ${_focusNode.hasFocus}"); }); } @override Widget build(BuildContext context) { return TextField(focusNode: _focusNode); } @override void dispose() { _focusNode.dispose(); super.dispose(); } } |
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