paperless-mobile/lib/features/labels/view/widgets/label_tab_view.dart

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:paperless_api/paperless_api.dart';
import 'package:paperless_mobile/core/bloc/connectivity_cubit.dart';
import 'package:paperless_mobile/core/repository/label_repository.dart';
import 'package:paperless_mobile/features/labels/bloc/label_cubit.dart';
import 'package:paperless_mobile/core/widgets/offline_widget.dart';
import 'package:paperless_mobile/features/labels/bloc/label_state.dart';
import 'package:paperless_mobile/features/labels/view/widgets/label_item.dart';
import 'package:paperless_mobile/extensions/flutter_extensions.dart';

class LabelTabView<T extends Label> extends StatelessWidget {
  final DocumentFilter Function(Label) filterBuilder;
  final void Function(T) onEdit;
  final void Function() onAddNew;

  /// Displayed as the subtitle of the [ListTile]
  final Widget Function(T)? contentBuilder;

  /// Displayed as the leading widget of the [ListTile]
  final Widget Function(T)? leadingBuilder;

  /// Shown on empty State
  final String emptyStateDescription;
  final String emptyStateActionButtonLabel;

  const LabelTabView({
    super.key,
    required this.filterBuilder,
    this.contentBuilder,
    this.leadingBuilder,
    required this.onEdit,
    required this.emptyStateDescription,
    required this.onAddNew,
    required this.emptyStateActionButtonLabel,
  });

  @override
  Widget build(BuildContext context) {
    return BlocBuilder<ConnectivityCubit, ConnectivityState>(
      builder: (context, state) {
        if (state == ConnectivityState.notConnected) {
          return const OfflineWidget();
        }
        return BlocBuilder<LabelCubit<T>, LabelState<T>>(
          builder: (context, state) {
            final labels = state.labels.values.toList()..sort();
            if (labels.isEmpty) {
              return Center(
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.center,
                  children: [
                    Text(
                      emptyStateDescription,
                      textAlign: TextAlign.center,
                    ),
                    TextButton(
                      onPressed: onAddNew,
                      child: Text(emptyStateActionButtonLabel),
                    )
                  ].padded(),
                ),
              );
            }
            return ListView(
              children: labels
                  .map((l) => LabelItem<T>(
                        name: l.name,
                        content:
                            contentBuilder?.call(l) ?? Text(l.match ?? '-'),
                        onOpenEditPage: onEdit,
                        filterBuilder: filterBuilder,
                        leading: leadingBuilder?.call(l),
                        label: l,
                      ))
                  .toList(),
            );
          },
        );
      },
    );
  }
}