Flutter 自定义 RadioListTile

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
/// 自定义 RadioListTile
class RadioListTileSuper<T> extends StatelessWidget {
const RadioListTileSuper({
Key key,
this.value,
this.groupValue,
this.onChanged,
this.toggleable = false,
this.activeColor,
this.title,
this.subtitle,
this.isThreeLine = false,
this.dense,
this.secondary,
this.selected = false,
this.controlAffinity = ListTileControlAffinity.platform,
this.autofocus = false,
this.contentPadding,
this.shape,
this.tileColor,
this.selectedTileColor,
}) : assert(toggleable != null),
assert(isThreeLine != null),
assert(!isThreeLine || subtitle != null),
assert(selected != null),
assert(controlAffinity != null),
assert(autofocus != null),
super(key: key);
final T value;
final T groupValue;
final ValueChanged<T> onChanged;
final bool toggleable;
final Color activeColor;
final Widget title;
final Widget subtitle;
final Widget secondary;
final bool isThreeLine;
final bool dense;
final bool selected;
final ListTileControlAffinity controlAffinity;
final bool autofocus;
final EdgeInsetsGeometry contentPadding;
bool get checked => value == groupValue;
final ShapeBorder shape;
final Color tileColor;
final Color selectedTileColor;
@override
Widget build(BuildContext context) {
final Widget control = Radio<T>(
value: value,
groupValue: groupValue,
onChanged: onChanged,
toggleable: toggleable,
activeColor: activeColor,
materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
autofocus: autofocus,
);
Widget leading, trailing;
switch (controlAffinity) {
case ListTileControlAffinity.leading:
case ListTileControlAffinity.platform:
leading = control;
trailing = secondary;
break;
case ListTileControlAffinity.trailing:
leading = secondary;
trailing = control;
break;
}
return MergeSemantics(
child: ListTileTheme.merge(
selectedColor: activeColor ?? Theme.of(context).accentColor,
child: ListTile(
leading: leading,
title: title,
subtitle: subtitle,
trailing: trailing,
horizontalTitleGap:0,//和源码的区别就是加了一个这个
isThreeLine: isThreeLine,
dense: dense,
enabled: onChanged != null,
shape: shape,
tileColor: tileColor,
selectedTileColor: selectedTileColor,
onTap: onChanged != null ? () {
if (toggleable && checked) {
onChanged(null);
return;
}
if (!checked) {
onChanged(value);
}
} : null,
selected: selected,
autofocus: autofocus,
contentPadding: contentPadding,
),
),
);
}
}

import 'package:flutter/material.dart';
import 'p