24 lines
759 B
Dart
24 lines
759 B
Dart
import 'package:flutter/foundation.dart';
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class FormFieldController<T> extends ValueNotifier<T?> {
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FormFieldController(this.initialValue) : super(initialValue);
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final T? initialValue;
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void reset() => value = initialValue;
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void update() => notifyListeners();
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}
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// If the initial value is a list (which it is for multiselect),
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// we need to use this controller to avoid a pass by reference issue
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// that can result in the initial value being modified.
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class FormListFieldController<T> extends FormFieldController<List<T>> {
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final List<T>? _initialListValue;
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FormListFieldController(super.initialValue)
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: _initialListValue = List<T>.from(initialValue ?? []);
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@override
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void reset() => value = List<T>.from(_initialListValue ?? []);
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}
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