100 lines
2.8 KiB
Dart
100 lines
2.8 KiB
Dart
import 'package:flutter/material.dart';
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class TextDropdownButton<T> extends StatefulWidget {
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final List<T> values;
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final String Function(T value) valueText;
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final IconData Function(T value)? valueIcon;
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final T? value;
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final Widget? underline;
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final bool isExpanded;
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final double? itemHeight;
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final Color? dropdownColor;
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final EdgeInsetsGeometry? padding;
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final ValueChanged<T?>? onChanged;
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const TextDropdownButton({
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super.key,
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required this.values,
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required this.valueText,
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this.valueIcon,
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this.value,
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this.underline,
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this.isExpanded = false,
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this.itemHeight = kMinInteractiveDimension,
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this.dropdownColor,
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this.padding,
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required this.onChanged,
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});
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@override
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State<TextDropdownButton<T>> createState() => _TextDropdownButtonState<T>();
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}
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class _TextDropdownButtonState<T> extends State<TextDropdownButton<T>> {
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@override
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Widget build(BuildContext context) {
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return DropdownButton(
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items: widget.values
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.map(
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(v) => DropdownMenuItem<T>(
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value: v,
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child: _buildItem(widget.valueText(v), widget.valueIcon?.call(v), selected: false),
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),
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)
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.toList(),
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selectedItemBuilder: (context) => widget.values
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.map(
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(v) => DropdownMenuItem<T>(
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value: v,
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child: _buildItem(widget.valueText(v), widget.valueIcon?.call(v), selected: true),
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),
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)
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.toList(),
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value: widget.value,
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style: Theme.of(context).textTheme.titleMedium!.copyWith(fontWeight: FontWeight.normal),
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underline: widget.underline,
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isExpanded: widget.isExpanded,
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itemHeight: widget.itemHeight,
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dropdownColor: widget.dropdownColor,
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padding: widget.padding,
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onChanged: widget.onChanged,
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);
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}
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static Widget _buildItem<T>(String text, IconData? icon, {required bool selected}) {
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final softWrap = selected ? false : null;
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final overflow = selected ? TextOverflow.fade : null;
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Widget child = icon != null
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? Text.rich(
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TextSpan(
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children: [
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WidgetSpan(
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alignment: PlaceholderAlignment.middle,
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child: Padding(
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padding: const EdgeInsetsDirectional.only(end: 8, bottom: 2),
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child: Icon(icon),
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),
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),
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TextSpan(text: text),
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],
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),
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softWrap: softWrap,
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overflow: overflow,
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)
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: Text(
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text,
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softWrap: softWrap,
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overflow: overflow,
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);
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if (selected) {
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child = Align(
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alignment: AlignmentDirectional.centerStart,
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child: child,
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);
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}
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return child;
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}
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}
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