comunicmobile/lib/ui/dialogs/multi_choices_dialog.dart

import 'package:comunic/utils/intl_utils.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/material.dart';

/// Build and show a dialog to offer to the user to choose between several
/// options
///
/// @author Pierre HUBERT

class MultiChoiceEntry<T> {
  final T id;
  final String title;
  final String subtitle;

  const MultiChoiceEntry({
    @required this.id,
    @required this.title,
    this.subtitle,
  })  : assert(id != null),
        assert(title != null);
}

/// Show multiple choices dialog
Future<T> showMultiChoicesDialog<T>({
  @required BuildContext context,
  @required List<MultiChoiceEntry<T>> choices,
  @required T defaultChoice,
  @required String title,
}) async {
  return await showDialog<T>(
      context: context,
      builder: (c) => _MultiChoicesEntryDialog(
            title: title,
            defaultChoice: defaultChoice,
            choices: choices,
          ));
}

class _MultiChoicesEntryDialog<T> extends StatefulWidget {
  final String title;
  final T defaultChoice;
  final List<MultiChoiceEntry<T>> choices;

  const _MultiChoicesEntryDialog({
    Key key,
    @required this.title,
    @required this.defaultChoice,
    @required this.choices,
  })  : assert(title != null),
        assert(defaultChoice != null),
        assert(choices != null),
        super(key: key);

  @override
  __MultiChoicesEntryDialogState createState() =>
      __MultiChoicesEntryDialogState();
}

class __MultiChoicesEntryDialogState<T>
    extends State<_MultiChoicesEntryDialog<T>> {
  T _currChoice;

  @override
  void initState() {
    super.initState();
    _currChoice = widget.defaultChoice;
  }

  @override
  Widget build(BuildContext context) {
    return AlertDialog(
      title: Text(widget.title),
      content: SingleChildScrollView(
        child: IntrinsicHeight(
          child: Column(
            children: widget.choices
                .map((f) => ListTile(
                      leading: Radio<T>(
                        groupValue: _currChoice,
                        value: f.id,
                        onChanged: (v) => setState(() => _currChoice = v),
                      ),
                      title: Text(f.title),
                      subtitle: Text(f.subtitle),
                    ))
                .toList(),
          ),
        ),
      ),
      actions: <Widget>[
        MaterialButton(
          onPressed: () => Navigator.of(context).pop(),
          child: Text(tr("Cancel").toUpperCase()),
          textColor: Colors.red,
        ),
        MaterialButton(
          onPressed: () => Navigator.of(context).pop(_currChoice),
          child: Text(tr("Confirm").toUpperCase()),
          textColor: Colors.green,
        ),
      ],
    );
  }
}