flutter_form_wizard/lib/src/widgets/input/abstractions.dart

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '/src/utils/formstate.dart' as fs;

/// Abstract class for the input widgets used in a [FlutterForm].
///
/// The controller [FlutterFormInputController] has to be given to the widget.
/// Which controller is used determines how to value will be handled.
///
/// label is a standard parameter to normally sets the label of the input.
///
/// [registerController] should be called to register the given [controller] to the form page.
abstract class FlutterFormInputWidget<T> extends ConsumerWidget {
  const FlutterFormInputWidget({
    Key? key,
    required this.controller,
    this.label,
    String? hintText,
  }) : super(key: key);

  /// The [controller] which determines how the value is handled and how the value is shown on the checkpage.
  final FlutterFormInputController<T> controller;

  /// [label] is a standard parameter to normally sets the label of the input.
  final Widget? label;

  /// [registerController] should be called to register the given [controller] to the form page.
  registerController(BuildContext context) {
    FlutterFormInputController? localController =
        fs.FormState.of(context).formController.getController(controller.id!);

    if (localController == null) {
      fs.FormState.of(context).formController.register(controller);
    }
  }
}

/// Abstract class for the controller for inputs used in a [FlutterForm].
///
/// The [id] determines the key in the [Map] returned by the [FlutterForm].
///
/// [value] is a way to set a initial value and will be the value when change by the user.
///
/// [mandatory] determines if the input is mandatory.
///
/// [checkPageTitle] is a function where you can transform the value from the input into something representable.
/// This value will be given when defining the check page widgets.
/// If this function is not set, the value will be used as is.
/// Example:
/// ``` dart
/// checkPageTitle: (dynamic amount) {
///   return "$amount persons";
/// },
/// ```
///
/// [checkPageDescription] is the same as checkPageTitle but for the description.
/// If null no description will be shown.
///
/// [onChanged] can be set to get the value whenever the user changes it. Should not be used to save the value.
///
/// [onSaved] goes of when the save function is called for the page if [onValidate] return null.
///
/// [onValidate] is used to validate the given input by the user.
abstract class FlutterFormInputController<T> {
  /// The [id] determines the key in the [Map] returned by the [FlutterForm].
  String? id;

  /// [value] is a way to set a initial value and will be the value when change by the user.
  T? value;

  /// [mandatory] determines if the input is mandatory.
  bool mandatory = false;

  /// [checkPageTitle] is a function where you can transform the value from the input into something representable.
  /// This value will be given when defining the check page widgets.
  /// If this function is not set, the value will be used as is.
  /// Example:
  /// ``` dart
  /// checkPageTitle: (dynamic amount) {
  ///   return "$amount persons";
  /// },
  /// ```
  String Function(T? value)? checkPageTitle;

  /// [checkPageDescription] is the same as checkPageTitle but for the description.
  /// If null no description will be shown.
  String Function(T? value)? checkPageDescription;

  /// [onChanged] can be set to get the value whenever the user changes it. Should not be used to save the value.
  void Function(T? value)? onChanged;

  /// [onSaved] goes of when the save function is called for the page if [onValidate] return null.
  void onSaved(T? value);

  /// [onValidate] is used to validate the given input by the user.
  String? onValidate(
      T? value, String Function(String, {List<String>? params}) translator);
}