Adding Shadows at the bottom of a container in flutter? - flutter

Question

I have a simple screen with a container about 100 in height and with blue color. I want to add a shadow or elevation at the bottom of the container.
This is my code below
import 'package:flutter/material.dart';
import 'package:finsec/utils/strings.dart';
import 'package:finsec/utils/dimens.dart';
import 'package:finsec/utils/colors.dart';
void main() {
runApp(new IncomeFragment());
}
class IncomeFragment extends StatelessWidget {
#override
Widget build(BuildContext context) {
return new Stack(
children: <Widget>[
new Container(
height: margin_100dp,
color: colorPrimary,
),
new Container( //container to overlay on top of blue container
alignment: Alignment.topCenter,
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
mainAxisSize: MainAxisSize.min,
children: <Widget>[
Text(
zero_amount,
style: TextStyle(color: white, fontSize: 40.0, fontWeight: FontWeight.bold)
),
],
),
)
],
);
}
}
can someone help me to add a shadow or elevation at the bottom of my blue container?
see image below. shawdow should be in place in the red circle
thanks in advance

Answer 1

You can reuse the first container that you have in your Stack, the container has a property called decoration and it accept a widget of kind BoxDecoration, as you can see in this link: BoxDecoration
Inside this widget you can use the boxShadow property to give to your container a custom shadow, try the next code:
new Container(
height: margin_100dp,
decoration: BoxDecoration(
boxShadow: <BoxShadow>[
BoxShadow(
color: Colors.black54,
blurRadius: 15.0,
offset: Offset(0.0, 0.75)
)
],
color: colorPrimary
),
),

Answer 2

Or you can wrap your Container widget with a Material widget which contains an elevation property to give the shadowy effects.
Container(
child: Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Material(
elevation: 15.0,
child: Container(
height: 100,
width: 100,
color: Colors.blue,
child: Center(child: Text("Material",style: TextStyle(color: Colors.white),)),
),
),
SizedBox(width: 100,),
Container(
height: 100,
width: 100,
decoration: BoxDecoration(
boxShadow: <BoxShadow>[
BoxShadow(
color: Colors.black54,
blurRadius: 15.0,
offset: Offset(0.0, 0.75)
)
],
color: Colors.blue
),
child: Center(child: Text('Box Shadow',style: TextStyle(color: Colors.white))),
),
],
),
),
Image:
Difference between two widgets is shown above. Hope this helps!!!

Answer 3

Yes, BoxShadow can solve the problem but instead of manually adding the list of BoxShadow, there is a handy map in flutter call kElevationToShadow which map elevation keys to pre-defined list of BoxShadow. It is also defined based on the material design elevation.
Container(
height: 60.0,
decoration: BoxDecoration(
boxShadow: kElevationToShadow[4],
color: Theme.of(context).bottomAppBarColor,
),
child: ...
);

Answer 4

Container(
margin: EdgeInsets.only(bottom: 7),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(10),
boxShadow: kElevationToShadow[2], // Use This kElevationToShadow ***********
),
child: Center(child: Text('With BoxShadow')),
),
Material( // Using Material Widget ***********************
elevation: 5,
borderRadius: BorderRadius.circular(10),
child: Container(
margin: EdgeInsets.only(bottom: 7),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.circular(10),
),
child: Center(child: Text('With BoxShadow')),
),
),

Answer 5

use the Container Shadow as below:
decoration: BoxDecoration(
boxShadow: [
BoxShadow(
color: Colors.black,
offset: Offset(20.0, 10.0),
blurRadius: 20.0,
spreadRadius: 40.0,
),
],
),
Controll the blurRadius and the SpreadRadius depending on your needs

Answer 6

if you want a container to have shadow only top
boxShadow: [
BoxShadow(
color: Color.fromARGB(255, 218, 218, 218),
blurRadius: 10.0, // soften the shadow
spreadRadius: 0.0, //extend the shadow
offset: Offset(
0.0, // Move to right 10 horizontally
-15.0, // Move to bottom 10 Vertically
),
)
],

Answer 7

You can add several BoxShadow to show the shadow you need,
with OffSet propertie you can move the shadow.
boxShadow: [
BoxShadow(
color: Colors.blue,
offset: Offset(0, 8), // hide shadow top
blurRadius: 5),
BoxShadow(
color: Colors.white, // replace with color of container
offset: Offset(-8, 0), // hide shadow right
),
BoxShadow(
color: Colors.white, // replace with color of container
offset: Offset(8, 0), // hide shadow left
),
],