m3_lightmeter/lib/screens/film_edit/screen_film_edit.dart

import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:lightmeter/generated/l10n.dart';
import 'package:lightmeter/res/dimens.dart';
import 'package:lightmeter/screens/film_edit/bloc_film_edit.dart';
import 'package:lightmeter/screens/film_edit/components/exponential_formula_input/widget_input_exponential_formula_film_edit.dart';
import 'package:lightmeter/screens/film_edit/components/iso_picker/widget_picker_iso_film_edit.dart';
import 'package:lightmeter/screens/film_edit/components/name_field/widget_field_name_film_edit.dart';
import 'package:lightmeter/screens/film_edit/event_film_edit.dart';
import 'package:lightmeter/screens/film_edit/state_film_edit.dart';
import 'package:lightmeter/screens/shared/sliver_screen/screen_sliver.dart';

class FilmEditScreen extends StatefulWidget {
  final bool isEdit;

  const FilmEditScreen({
    required this.isEdit,
    super.key,
  });

  @override
  State<FilmEditScreen> createState() => _FilmEditScreenState();
}

class _FilmEditScreenState extends State<FilmEditScreen> {
  @override
  Widget build(BuildContext context) {
    return SliverScreen(
      title: Text(widget.isEdit ? S.of(context).editFilmTitle : S.of(context).addFilmTitle),
      appBarActions: [
        BlocBuilder<FilmEditBloc, FilmEditState>(
          buildWhen: (previous, current) => previous.canSave != current.canSave,
          builder: (context, state) => IconButton(
            onPressed: state.canSave
                ? () {
                    context.read<FilmEditBloc>().add(const FilmEditSaveEvent());
                    Navigator.of(context).pop();
                  }
                : null,
            icon: const Icon(Icons.save),
          ),
        ),
        if (widget.isEdit)
          IconButton(
            onPressed: () {
              context.read<FilmEditBloc>().add(const FilmEditDeleteEvent());
              Navigator.of(context).pop();
            },
            icon: const Icon(Icons.delete),
          ),
      ],
      slivers: [
        SliverToBoxAdapter(
          child: Padding(
            padding: const EdgeInsets.fromLTRB(
              Dimens.paddingM,
              0,
              Dimens.paddingM,
              Dimens.paddingM,
            ),
            child: Card(
              child: Padding(
                padding: const EdgeInsets.symmetric(vertical: Dimens.paddingM),
                child: Column(
                  children: [
                    BlocBuilder<FilmEditBloc, FilmEditState>(
                      buildWhen: (previous, current) => previous.name != current.name,
                      builder: (context, state) => FilmEditNameField(
                        name: state.name,
                        onChanged: (value) {
                          context.read<FilmEditBloc>().add(FilmEditNameChangedEvent(value));
                        },
                      ),
                    ),
                    BlocBuilder<FilmEditBloc, FilmEditState>(
                      buildWhen: (previous, current) => previous.isoValue != current.isoValue,
                      builder: (context, state) => FilmEditIsoPicker(
                        selected: state.isoValue,
                        onChanged: (value) {
                          context.read<FilmEditBloc>().add(FilmEditIsoChangedEvent(value));
                        },
                      ),
                    ),
                    BlocBuilder<FilmEditBloc, FilmEditState>(
                      buildWhen: (previous, current) => previous.exponent != current.exponent,
                      builder: (context, state) => FilmEditExponentialFormulaInput(
                        value: state.exponent,
                        onChanged: (value) {
                          context.read<FilmEditBloc>().add(FilmEditExpChangedEvent(value));
                        },
                      ),
                    ),
                  ],
                ),
              ),
            ),
          ),
        ),
        SliverToBoxAdapter(child: SizedBox(height: MediaQuery.paddingOf(context).bottom)),
      ],
    );
  }
}