Flutter - custom toggle buttons selection - flutter

Question

I am building a row of toggle buttons (on/off selectors) which is basically a row of containers and each container is a category and is clickable.
Q: How to make it so in a way when one category is selected all the others get deselected?
This is the categories widget I've build:
Widget header(){
return Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
padding: EdgeInsets.only(top: 4.0, left: 0.0, right: 0.0, bottom: 6.0),
child: Container(
child: Center(
child: Column(
children: <Widget>[
SizedBox(height: 4.0,),
Container(
margin: EdgeInsets.only(left: 10.0, right: 10.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
InkWell(
splashColor: Colors.blue[100],
onTap: (){},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.blueAccent[100],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('All',
style: TextStyle(color: Colors.white, fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
SizedBox(width: 2.0,),
InkWell(
splashColor: Colors.blue[100],
onTap: (){},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('category 1',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
SizedBox(width: 2.0,),
InkWell(
splashColor: Colors.blue[100],
onTap: (){},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('category 2',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
SizedBox(width: 2.0,),
InkWell(
splashColor: Colors.blue[100],
onTap: (){},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('category 3',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
SizedBox(width: 2.0,),
InkWell(
splashColor: Colors.blue[100],
onTap: (){},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('category 4',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
],
),
),
SizedBox(height: 6.0,)
],
),
),
),
),
],
);
}`

Answer 1

The best way would be to use ListView.builder to build your items and save the selected indexes but you can also modify your existing code to save selected items in a list and check to see if the item is in the list and if it is then add selection format and refresh the page. You can implement that as shown below,
class MyApp extends StatefulWidget {
#override
MyAppState createState() => MyAppState();
}
class MyAppState extends State<MyApp> {
List<String> selectedCategory = new List<String>();
String all = 'All';
String category1 = 'category 1';
String category2 = 'category 2';
String category3 = 'category 3';
String category4 = 'category 4';
#override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
appBar: AppBar(
title: Text('Test'),
),
body: Container(
padding: const EdgeInsets.all(20.0),
child: header()
)));
}
Widget header(){
return Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Container(
padding: EdgeInsets.only(top: 4.0, left: 0.0, right: 0.0, bottom: 6.0),
child: Container(
child: Center(
child: Column(
children: <Widget>[
SizedBox(height: 4.0,),
Container(
margin: EdgeInsets.only(left: 10.0, right: 10.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
InkWell(
splashColor: Colors.blue[100],
onTap: (){
selectedCategory.add(all);
selectedCategory.add(category1);
selectedCategory.add(category2);
selectedCategory.add(category3);
selectedCategory.add(category4);
setState(() {});
},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: selectedCategory.contains(all) ? Colors.blueAccent[100] : Colors.grey[500],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('All',
style: TextStyle(color: Colors.white, fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
SizedBox(width: 2.0,),
InkWell(
splashColor: Colors.blue[100],
onTap: (){
selectedCategory = new List<String>();
selectedCategory.add(category1);
setState(() {});
},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: selectedCategory.contains(category1) ? Colors.blue[100] : Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('category 1',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
SizedBox(width: 2.0,),
InkWell(
splashColor: Colors.blue[100],
onTap: (){
selectedCategory = new List<String>();
selectedCategory.add(category2);
setState(() {});
},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: selectedCategory.contains(category2) ? Colors.blue[100] : Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('category 2',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
SizedBox(width: 2.0,),
InkWell(
splashColor: Colors.blue[100],
onTap: (){
selectedCategory = new List<String>();
selectedCategory.add(category3);
setState(() {});
},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: selectedCategory.contains(category3) ? Colors.blue[100] : Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('category 3',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
SizedBox(width: 2.0,),
InkWell(
splashColor: Colors.blue[100],
onTap: (){
selectedCategory = new List<String>();
selectedCategory.add(category4);
setState(() {});
},
child: Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: selectedCategory.contains(category4) ? Colors.blue[100] : Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('category 4',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
),
),
],
),
),
SizedBox(height: 6.0,)
],
),
),
),
),
],
);
}
}
Hope this helps.

Answer 2

Well, this piece of code can be optimized, but so far this worked just fine:
class Header extends StatefulWidget {
#override
_HeaderState createState() => _HeaderState();
}
class _HeaderState extends State<Header> {
List<bool> isSelected;
#override
void initState() {
isSelected = [true, false, false, false, false];
super.initState();
}
#override
Widget build(BuildContext context) {
return Column(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: <Widget>[
ToggleButtons(
borderColor: Colors.transparent,
fillColor: Colors.transparent,
borderWidth: null,
selectedBorderColor: Colors.transparent,
selectedColor: Colors.transparent,
splashColor: Colors.transparent,
children: <Widget>[
!isSelected[0] ?
Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
margin: EdgeInsets.only(right: 3.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 1',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
)
:Container(
margin: EdgeInsets.only(right: 3.0),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.blueAccent[100],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 1',
style: TextStyle(color: Colors.white, fontSize: 10.0, fontWeight: FontWeight.w700),),
),
!isSelected[1] ?
Container(
margin: EdgeInsets.only(right: 3.0),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 2',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
)
:Container(
margin: EdgeInsets.only(right: 3.0),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.blueAccent[100],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 2',
style: TextStyle(color: Colors.white, fontSize: 10.0, fontWeight: FontWeight.w700),),
),
!isSelected[2] ?
Container(
margin: EdgeInsets.only(right: 3.0),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 3',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
)
:Container(
margin: EdgeInsets.only(right: 3.0),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.blueAccent[100],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 3',
style: TextStyle(color: Colors.white, fontSize: 10.0, fontWeight: FontWeight.w700),),
),
!isSelected[3] ?
Container(
margin: EdgeInsets.only(right: 3.0),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 4',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
)
:Container(
margin: EdgeInsets.only(right: 3.0),
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.blueAccent[100],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 4',
style: TextStyle(color: Colors.white, fontSize: 10.0, fontWeight: FontWeight.w700),),
),
!isSelected[4] ?
Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.grey[300],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 5',
style: TextStyle(color: Colors.grey[900], fontSize: 10.0, fontWeight: FontWeight.w500),),
)
:Container(
padding: EdgeInsets.symmetric(vertical: 10.0, horizontal: 12.0),
decoration: BoxDecoration(
color: Colors.blueAccent[100],
borderRadius: BorderRadius.all(Radius.circular(48.0)),
),
child: Text('cat 5',
style: TextStyle(color: Colors.white, fontSize: 10.0, fontWeight: FontWeight.w700),),
),
],
onPressed: (int index) {
setState(() {
for (int i = 0; i < isSelected.length; i++) {
isSelected[i] = i == index;
}
});
},
isSelected: isSelected,
),
],
);
}
}