57 lines
1.6 KiB
Dart
57 lines
1.6 KiB
Dart
// Flutter imports:
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import 'package:flutter/material.dart';
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class AppDropdownButton<T> extends StatelessWidget {
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const AppDropdownButton({
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Key? key,
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required this.value,
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required this.onChanged,
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required this.items,
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this.selectedItemBuilder,
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this.labelText,
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this.showBlank = false,
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this.blankValue = '',
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this.blankLabel,
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this.enabled = true,
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}) : super(key: key);
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final String? labelText;
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final dynamic value;
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final Function(dynamic)? onChanged;
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final List<DropdownMenuItem<T>> items;
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final bool showBlank;
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final bool enabled;
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final dynamic blankValue;
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final String? blankLabel;
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final DropdownButtonBuilder? selectedItemBuilder;
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@override
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Widget build(BuildContext context) {
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dynamic checkedValue = value;
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final values = items.toList().map((option) => option.value).toList();
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if (!values.contains(value)) {
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checkedValue = blankValue;
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}
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final bool isEmpty = checkedValue == null || checkedValue == '';
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return DropdownButtonFormField<T>(
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decoration: labelText != null
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? InputDecoration(label: Text(labelText!))
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: InputDecoration.collapsed(hintText: ''),
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value: checkedValue == blankValue ? null : checkedValue,
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isExpanded: true,
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isDense: labelText != null,
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onChanged: enabled ? onChanged : null,
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selectedItemBuilder: selectedItemBuilder,
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items: [
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if (showBlank || isEmpty)
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DropdownMenuItem<T>(
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value: blankValue,
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child: blankLabel == null ? SizedBox() : Text(blankLabel!),
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),
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...items
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],
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);
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}
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}
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