BlocPager to discuss

BlocPager.dart

import 'package:bloc/bloc.dart';
import 'package:flutter/material.dart';
import 'package:pager/pager.dart';

typedef BlocPagerCondition<State extends Object> = bool Function(State state);

class BlocPager<State extends Object> extends StatelessWidget {
  final IStateObservable<State> bloc;
  final PagerWidgetBuilder<State> builder;
  final BlocPagerCondition<State>? buildWhen;

  const BlocPager({
    Key? key,
    required this.bloc,
    required this.builder,
    this.buildWhen,
  }) : super(key: key);

  @override
  Widget build(BuildContext context) {
    Stream<State> stream = bloc.stream;
    if (buildWhen != null) stream = stream.where((state) => buildWhen!(state));

    return Pager<State>(
      initialData: bloc.state,
      stream: stream.distinct(),
      builder: builder,
    );
  }
}