How to overlap widgets by respecting their sizes at Flutter? - flutter

Question

I just want to overlap 2 Container by respecting first Container's width.
This is what I want to achieve.
Containers not occupying space When I use Stack Widget. So I think stack widget not working for me.
And It is not overlapping when I use Row. So Row is not working either.
In CSS I just give negative margin to the right element and it is done. But I couldn't figure out the way to achieve that in flutter.
I put these Containers in to the Stack. Because I have to overflow a Card widget with that Containers

Answer 1

Try below code hope its help to you
You can use Stack Widget for that
Container(
height: 60,
margin: EdgeInsets.symmetric(
horizontal: 4),
child: Stack(
children: [
Positioned.fill(
child: Container(
decoration: BoxDecoration(
color: Colors.yellow,
borderRadius: BorderRadius.only(
topRight: Radius.circular(6),
bottomRight: Radius.circular(6),
),
),
margin: EdgeInsets.symmetric(vertical: 4),
padding: EdgeInsets.symmetric(horizontal: 20),
alignment: Alignment.centerRight,
child: Text('Ends after 1 Hour'),
),
),
Positioned(
top: 0,
bottom: 0,
child: Container(
decoration: BoxDecoration(
color: Colors.redAccent,
borderRadius: BorderRadius.only(
topRight: Radius.circular(6),
bottomRight: Radius.circular(6),
),
),
alignment: Alignment.center,
padding: EdgeInsets.only(right: 8, left: 20),
child: Text('40% Discount'),
),
),
],
),
),
Your result screen ->

Answer 2

Here is my trial.
Using Stack and set 'clipBehavior: Clip.none' parameter.
Added 'addPostFrameCallback' method to get a left container's width.
import 'package:flutter/material.dart';
void main() {
runApp(MyApp());
}
class MyApp extends StatelessWidget {
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
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> {
double firstContainerWidth = 0;
GlobalKey firstContainerKey = GlobalKey();
#override
void initState() {
super.initState();
WidgetsBinding.instance.addPostFrameCallback((_) {
firstContainerWidth = firstContainerKey.currentContext.size.width;
setState(() {});
});
}
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: _buildBody(),
floatingActionButton: FloatingActionButton(
onPressed: () {},
tooltip: 'Increment',
child: Icon(Icons.add),
),
);
}
Widget _buildBody() {
return Stack(
clipBehavior: Clip.none,
alignment: AlignmentDirectional.bottomStart,
children: <Widget>[
Positioned(
left: firstContainerWidth - 10,
child: Container(
padding: EdgeInsets.symmetric(horizontal: 15, vertical: 5),
decoration: BoxDecoration(
color: Colors.orange[400],
borderRadius: BorderRadius.all(Radius.circular(8.0)),
),
child: Text(
'Ends after 1 hour',
style: TextStyle(
fontSize: 15,
color: Colors.white,
),
),
),
),
Container(
key: firstContainerKey,
padding: EdgeInsets.symmetric(horizontal: 10, vertical: 5),
decoration: BoxDecoration(
color: Colors.red,
borderRadius: BorderRadius.all(Radius.circular(8.0)),
),
child: Text(
'%40 Discount',
style: TextStyle(
fontSize: 20,
color: Colors.white,
),
),
),
]);
}
}

Answer 3

It can be done in multiple ways. You can use CustomPainter, Stack or even Row to do this. Here is my approach using a Row only.
Result
Code : DartPad
class DiscountBadgeWidget extends StatelessWidget {
#override
Widget build(BuildContext context) {
return Row(mainAxisSize: MainAxisSize.min,
crossAxisAlignment: CrossAxisAlignment.end,
children: [
_buildRedSection(),
_buildMiddleSection(),
_buildYellowSection(),
],
);
}
Widget _buildMiddleSection() => Container(
color: Colors.yellow,
child: Align(
alignment: Alignment.bottomCenter,
heightFactor: .5,
child: Container(
height: 80,
width: 10,
decoration: const BoxDecoration(
color: Colors.red,
borderRadius: BorderRadius.horizontal(right: Radius.circular(10)),
),
),
),
);
Widget _buildRedSection() => Container(
height: 80,
decoration: const BoxDecoration(
color: Colors.red,
borderRadius: BorderRadius.horizontal(left: Radius.circular(10)),
),
padding: const EdgeInsets.only(left: 16, right:6),
alignment: Alignment.centerRight,
child: Text('40% Discount'),
);
Widget _buildYellowSection() => Container(
height: 60,
decoration: const BoxDecoration(
color: Colors.yellow,
borderRadius: BorderRadius.horizontal(right: Radius.circular(10)),
),
padding: const EdgeInsets.only(right: 16, left:6),
alignment: Alignment.centerRight,
child: Text('Ends after 1 Hour'),
);
}