keyboard_visibility_builder.dart

import 'package:flutter/material.dart';
import 'package:flutter_keyboard_visibility/flutter_keyboard_visibility.dart';

typedef KeyboardVisibilityWidgetBuilder = Widget Function(
  BuildContext context,
  bool keyboardVisibile,
);

class KeyboardVisibilityBuilder extends StatelessWidget {
  final KeyboardVisibilityWidgetBuilder builder;

  const KeyboardVisibilityBuilder({
    Key key,
    @required this.builder,
  })  : assert(builder != null),
        super(key: key);

  @override
  Widget build(BuildContext context) => builder(
        context,
        KeyboardVisibilityProvider.isKeyboardVisible(context),
      );
}