Flutter 当我的手势检测器';ListTile的尾部是什么?
我有一个带有ListTile的ListView和我的IconToggle,它在我的ListTile的尾部有一个手势检测器。但是当我试图点击图标时,我点击了列表?为什么会这样?我想能够点击我的切换,并让它切换到活动图标的图标 列表Flutter 当我的手势检测器';ListTile的尾部是什么?,flutter,Flutter,我有一个带有ListTile的ListView和我的IconToggle,它在我的ListTile的尾部有一个手势检测器。但是当我试图点击图标时,我点击了列表?为什么会这样?我想能够点击我的切换,并让它切换到活动图标的图标 列表 return ListTile ( title: Text( arguments.groups[index], style: Theme.of(context).textTheme.body1, ), onTap: () => onGr
return ListTile
(
title: Text(
arguments.groups[index],
style: Theme.of(context).textTheme.body1,
),
onTap: () => onGroupTap(arguments.groups[index]),
trailing: IconToggle(
isActive: false,
active: Icon
(
Icons.notifications,
color: Theme.of(context).iconTheme.color,
),
deactive: Icon
(
Icons.notifications_off,
color: Theme.of(context).accentColor,
),
),
);
图标切换
import 'package:flutter/material.dart';
import 'package:flutter/foundation.dart';
class IconToggle extends StatefulWidget {
bool isActive = true;
final Icon active;
final Icon deactive;
final Function(bool) onChanged;
IconToggle({this.isActive, @required this.active, @required this.deactive, this.onChanged})
: assert(isActive != null),
assert(active != null),
assert(deactive != null);
@override
_IconToggleState createState() => _IconToggleState();
}
class _IconToggleState extends State<IconToggle> {
_showIcon()
{
return widget.isActive ? widget.active : widget.deactive;
}
_toggle()
{
setState(() {
widget.isActive = !widget.isActive;
if(widget.onChanged != null)
widget.onChanged(widget.isActive);
});
}
@override
Widget build(BuildContext context) {
return GestureDetector
(
child: _showIcon(),
onTap: _toggle(),
);
}
}
导入“包装:颤振/材料.省道”;
进口“包装:颤振/基础.dart”;
类IContogle扩展StatefulWidget{
bool isActive=true;
最终图标激活;
最终图标无效;
最终功能(bool)一旦更改;
IconToggle({this.isActive,@required this.active,@required this.deactive,this.onChanged})
:assert(isActive!=null),
断言(活动!=null),
断言(deactive!=null);
@凌驾
_IContogolgEstate createState()=>\u IContogolgEstate();
}
类_ICONTOGGESTATE扩展状态{
_showIcon()
{
return widget.isActive?widget.active:widget.deactive;
}
_切换()
{
设置状态(){
widget.isActive=!widget.isActive;
if(widget.onChanged!=null)
widget.onChanged(widget.isActive);
});
}
@凌驾
小部件构建(构建上下文){
返回手势检测器
(
子项:_showIcon(),
onTap:_toggle(),
);
}
}
您可以复制粘贴运行下面的完整代码步骤1:将
手势检测器移动到尾随
步骤2:将toggle()
逻辑置于didUpdateWidget
步骤3:使用本地boolisActive
notwidget.isActive
trailing: GestureDetector(
onTap: () {
print("trailing ontap");
setState(() {
});
},
child: IconToggle(
...
@override
void didUpdateWidget(IconToggle oldWidget) {
super.didUpdateWidget(oldWidget);
print("didUpdateWidget ${isActive}");
isActive = !isActive;
if (widget.onChanged != null) widget.onChanged(isActive);
}
工作演示
完整代码
import 'package:flutter/material.dart';
class IconToggle extends StatefulWidget {
bool isActive = true;
final Icon active;
final Icon deactive;
final Function(bool) onChanged;
IconToggle(
{this.isActive,
@required this.active,
@required this.deactive,
this.onChanged})
: assert(isActive != null),
assert(active != null),
assert(deactive != null);
@override
_IconToggleState createState() => _IconToggleState();
}
class _IconToggleState extends State<IconToggle> {
bool isActive = false;
_showIcon() {
print("showIcon");
return isActive ? widget.active : widget.deactive;
}
@override
void initState() {
// TODO: implement initState
super.initState();
isActive = widget.isActive;
}
/*_toggle() {
print("toggle");
setState(() {
widget.isActive = !widget.isActive;
if (widget.onChanged != null) widget.onChanged(widget.isActive);
});
}*/
@override
void didUpdateWidget(IconToggle oldWidget) {
super.didUpdateWidget(oldWidget);
print("didUpdateWidget ${isActive}");
isActive = !isActive;
if (widget.onChanged != null) widget.onChanged(isActive);
}
@override
Widget build(BuildContext context) {
return _showIcon();
}
}
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
),
home: MyHomePage(title: 'Flutter Demo Home Page'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({Key key, this.title}) : super(key: key);
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
class _MyHomePageState extends State<MyHomePage> {
int _counter = 0;
void _incrementCounter() {
setState(() {
_counter++;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
ListTile(
title: Text(
"arguments.groups[index]",
style: Theme.of(context).textTheme.body1,
),
onTap: () => print("onGroupTap(arguments.groups[index])"),
trailing: GestureDetector(
onTap: () {
print("trailing ontap");
setState(() {
});
},
child: IconToggle(
isActive: false,
onChanged: (isActive) {
print("execute onChange $isActive");
},
active: Icon(
Icons.notifications,
color: Theme.of(context).iconTheme.color,
),
deactive: Icon(
Icons.notifications_off,
color: Theme.of(context).accentColor,
),
),
),
),
Text(
'You have pushed the button this many times:',
),
Text(
'$_counter',
style: Theme.of(context).textTheme.headline4,
),
],
),
),
floatingActionButton: FloatingActionButton(
onPressed: _incrementCounter,
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
}
导入“包装:颤振/材料.省道”;
类IContogle扩展StatefulWidget{
bool isActive=true;
最终图标激活;
最终图标无效;
最终功能(bool)一旦更改;
易变(
{this.isActive,
@需要这个。激活,
@需要这个,
此参数(已更改})
:assert(isActive!=null),
断言(活动!=null),
断言(deactive!=null);
@凌驾
_IContogolgEstate createState()=>\u IContogolgEstate();
}
类_ICONTOGGESTATE扩展状态{
bool isActive=false;
_showIcon(){
打印(“showIcon”);
return isActive?widget.active:widget.deactive;
}
@凌驾
void initState(){
//TODO:实现initState
super.initState();
isActive=widget.isActive;
}
/*_切换(){
打印(“切换”);
设置状态(){
widget.isActive=!widget.isActive;
如果(widget.onChanged!=null)widget.onChanged(widget.isActive);
});
}*/
@凌驾
void didUpdateWidget(IContogle oldWidget){
super.didUpdateWidget(oldWidget);
打印(“didUpdateWidget${isActive}”);
isActive=!isActive;
如果(widget.onChanged!=null)widget.onChanged(isActive);
}
@凌驾
小部件构建(构建上下文){
返回_showIcon();
}
}
void main()=>runApp(MyApp());
类MyApp扩展了无状态小部件{
@凌驾
小部件构建(构建上下文){
返回材料PP(
标题:“颤振演示”,
主题:主题数据(
主样本:颜色。蓝色,
),
主页:MyHomePage(标题:“颤振演示主页”),
);
}
}
类MyHomePage扩展StatefulWidget{
MyHomePage({Key,this.title}):超级(Key:Key);
最后的字符串标题;
@凌驾
_MyHomePageState createState()=>\u MyHomePageState();
}
类_MyHomePageState扩展状态{
int _计数器=0;
void _incrementCounter(){
设置状态(){
_计数器++;
});
}
@凌驾
小部件构建(构建上下文){
返回脚手架(
appBar:appBar(
标题:文本(widget.title),
),
正文:中(
子:列(
mainAxisAlignment:mainAxisAlignment.center,
儿童:[
列表砖(
标题:正文(
“arguments.groups[索引]”,
样式:Theme.of(context).textTheme.body1,
),
onTap:()=>print(“onGroupTap(arguments.groups[index])”,
跟踪:手势检测器(
onTap:(){
打印(“跟踪ontap”);
设置状态(){
});
},
孩子:我要跳(
I:错,
一旦更改:(i活动){
打印(“执行onChange$isActive”);
},
活动:图标(
图标、通知、,
颜色:Theme.of(context).iconTheme.color,
),
停用:图标(
Icons.u关闭,
颜色:主题。背景。强调颜色,
),
),
),
),
正文(
“您已经按了这么多次按钮:”,
),
正文(
“$”计数器“,
风格:Theme.of(context).textTheme.headline4,
),
],
),
),
浮动操作按钮:浮动操作按钮(
按下时:\ u递增计数器,
工具提示:“增量”,
子:图标(Icons.add),
),
);
}
}