71 lines
1.9 KiB
Dart
71 lines
1.9 KiB
Dart
import 'dart:convert';
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/// [label] is the item that is displayed in the list. [value] is the value that is returned when the item is selected.
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/// If the [value] is not provided, the [label] is used as the value.
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/// subLabel is the subtitle that is displayed in the list.
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/// An example of a [ValueItem] is:
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/// ```dart
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/// const ValueItem(label: 'Option 1', value: '1')
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/// ```
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class ValueItem<T> {
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/// The label of the value item
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final String label;
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final String? subLabel;
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/// The value of the value item
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final T? value;
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/// Default constructor for [ValueItem]
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const ValueItem({required this.label, required this.value, this.subLabel});
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/// toString method for [ValueItem]
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@override
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String toString() {
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return 'ValueItem(label: $label, value: $value, subLabel: $subLabel)';
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}
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/// toMap method for [ValueItem]
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Map<String, dynamic> toMap() {
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return {'label': label, 'value': value, 'subLabel': subLabel};
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}
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/// fromMap method for [ValueItem]
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factory ValueItem.fromMap(Map<String, dynamic> map) {
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return ValueItem<T>(
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label: map['label'] ?? '',
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value: map['value'],
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subLabel: map['subLabel'] ?? '');
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}
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/// toJson method for [ValueItem]
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String toJson() => json.encode(toMap());
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/// fromJson method for [ValueItem]
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factory ValueItem.fromJson(String source) =>
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ValueItem<T>.fromMap(json.decode(source));
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/// Equality operator for [ValueItem]
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@override
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bool operator ==(Object other) {
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if (identical(this, other)) return true;
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return other is ValueItem<T> && other.value == value;
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}
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/// Hashcode for [ValueItem]
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@override
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int get hashCode => label.hashCode ^ value.hashCode ^ subLabel.hashCode;
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/// CopyWith method for [ValueItem]
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ValueItem<T> copyWith({
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String? label,
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T? value,
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}) {
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return ValueItem<T>(
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label: label ?? this.label,
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value: value ?? this.value,
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subLabel: subLabel ?? this.subLabel);
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}
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}
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