Dissmiss the keyboard in Flutter when tapped or scrolled

keyboard_dismiss.dart

/// Removes the current focus and hides the keyboard when
/// the user drags or taps this widget.
///
/// Place this widget somewhere near the top of your widget
/// tree and when the user drags or taps outside of a focused widget,
/// the focus will be removed and the keyboard will be hidden.
class KeyboardDismiss extends StatelessWidget {
  final Widget child;
  final bool dismissOnTap;
  final bool dismissOnDrag;

  const KeyboardDismiss({Key? key, required this.child, this.dismissOnTap = true, this.dismissOnDrag = true})
      : super(key: key);

  void _hideKeyboard(BuildContext context) {
    final currentFocus = FocusScope.of(context);

    if (!currentFocus.hasPrimaryFocus && currentFocus.hasFocus) {
      FocusManager.instance.primaryFocus?.unfocus();
    }
  }

  @override
  Widget build(BuildContext context) {
    return NotificationListener<ScrollUpdateNotification>(
      child: GestureDetector(
          onTap: dismissOnTap
              ? () {
                  _hideKeyboard(context);
                }
              : null,
          child: child),
      onNotification: (ScrollUpdateNotification notification) {
        final focusScope = FocusScope.of(context);
        if (dismissOnDrag && notification.dragDetails != null && focusScope.hasFocus) {
          focusScope.unfocus();
        }
        return false;
      },
    );
  }
}