How do you adjust the height and borderRadius of a BottomSheet in Flutter?
Material DesignFlutterBottom SheetMaterial Design Problem Overview
I'm probably missing something obvious here, but my BottomSheet only takes up the bottom half the screen, even though the widgets in it take up more space. So now there is scrolling behavior inside the BottomSheet. I'd like to be able to increase the BottomSheet so that the user doesn't have to scroll as much.
I also want to add a borderRadius to the top of my BottomSheet, so that it looks more "modal"-y or "tab"-like.
Code:
void _showBottomSheet(BuildContext context) {
showModalBottomSheet<Null>(
context: context,
builder: (BuildContext context) {
return _bottomSheetScreen; // defined earlier on
},
);
}
I've tried:
showModalBottomSheet<Null>(
context: context,
builder: (BuildContext context) {
return Container(
decoration: BoxDecoration(
borderRadius: _borderRadius,
),
height: 1000.0,
child: _bottomSheetScreen,
);
},
);
but it seems like that only affects the contents inside the BottomSheet, and does not customize the BottomSheet itself.
Material Design Solutions
Solution 1 - Material Design
Default height for bottomSheet
is half the screenSize
If you want your bottomSheet
to EXPAND according to your content DYNAMICALLY
use below code
showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
return Wrap(
children: <Widget>[...]
)
}
)
This will automatically expand the bottomSheet
according to content inside.
For adding a radius on top of bottomSheet
return below code to `bottomSheet'
Container(
child: Container(
decoration: new BoxDecoration(
color: forDialog ? Color(0xFF737373) : Colors.white,
borderRadius: new BorderRadius.only(
topLeft: const Radius.circular(25.0),
topRight: const Radius.circular(25.0))),
child: yourWidget(),
),
)
Complete code meeting both requirements
showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
return Wrap(
children: <Widget>[
Container(
child: Container(
decoration: new BoxDecoration(
color: forDialog ? Color(0xFF737373) : Colors.white,
borderRadius: new BorderRadius.only(
topLeft: const Radius.circular(25.0),
topRight: const Radius.circular(25.0))),
child: yourWidget(),
),
)
]
)
}
)
Solution 2 - Material Design
It's possible this way
showModalBottomSheet(
context: context,
isScrollControlled: true,
backgroundColor: Colors.transparent,
builder: (context) => Container(
height: MediaQuery.of(context).size.height * 0.75,
decoration: new BoxDecoration(
color: Colors.white,
borderRadius: new BorderRadius.only(
topLeft: const Radius.circular(25.0),
topRight: const Radius.circular(25.0),
),
),
child: Center(
child: Text("Modal content goes here"),
),
),
);
- Set
isScrollControlled: true
andbackgroundColor: Colors.transparent
for the modal - Provide a
Container
with requiredheight:
as root widget to modal builder - Provide
BoxDecoration
with requiredborderRadius
for theContainer
Solution 3 - Material Design
You can use a Column Inside a SingleChildScrollView to dynamically change the height of bottom sheet and also it gets scrollable once it exceeds the available max height, make sure the isScrollControlled
is set to true,
And for the border radius the shape
property will help you add the borderRadius to the bottomsheet.
here's a dartpad example for the same
Future<void> _showBottomSheet() async {
return showModalBottomSheet(
isScrollControlled: true,
shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(13)),
backgroundColor: Colors.white,
context: context,
builder: (context) => SingleChildScrollView(
child: Column(
crossAxisAlignment: CrossAxisAlignment.center,
children: List.generate(kBoxes, (index) => _squareBox(index)))),
);
}
Solution 4 - Material Design
No need to wrap anything. Only set:
isScrollControlled: true
inshowModalBottomSheet
shrinkWrap: true,
inListView
Here is the minimal general code:
import 'package:flutter/material.dart';
Future<Widget> show123(BuildContext context) {
return showModalBottomSheet<dynamic>(
useRootNavigator: true,
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
return ListView(
shrinkWrap: true,
children: [
ListItem(),
ListItem(),
ListItem(),
],
);
});
}
You can get inspired by my case which depends on the number of AlbumRow
dynamically. If the height reaches the maximum, you can get to the bottom by scrolling.
import 'package:flutter/material.dart';
Future<Widget> showBottomSheet(BuildContext context) {
return showModalBottomSheet<dynamic>(
useRootNavigator: true,
barrierColor: Colors.black.withOpacity(0.5),
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
return ConstrainedBox(
constraints: BoxConstraints(maxHeight: MediaQuery.of(context).size.height * 0.9),
child: Container(
decoration: new BoxDecoration(
color: Colors.blue, borderRadius: new BorderRadius.only(topLeft: const Radius.circular(25.0), topRight: const Radius.circular(25.0))),
child: ListView(
shrinkWrap: true,
children: [
Padding(
padding: const EdgeInsets.fromLTRB(30, 30, 30, 45),
child: Text(
'Choose Album',
textAlign: TextAlign.center,
),
),
AlbumRow(title: 'For Weekends arta iretnairstnaisetn aistn aisetn'),
AlbumRow(title: 'Creative'),
AlbumRow(title: 'Christmas'),
AlbumRow(title: 'For Weekends arta iretnairstnaisetn aistn aisetn'),
],
),
),
);
});
}
Solution 5 - Material Design
Use showBottomSheet instead of showModalBottomSheet
Create global key and a listener
final _scaffoldKey = new GlobalKey<ScaffoldState>();
VoidCallback _showPersBottomSheetCallBack;
Write your method to show the sheet
void _showBottomSheet() {
setState(() {
_showPersBottomSheetCallBack = null;
});
_scaffoldKey.currentState
.showBottomSheet((context) {
return new Container(
height: MediaQuery.of(context).size.height-100.0,
color: Colors.greenAccent,
child: new Center(
child: new Text("Hi BottomSheet"),
),
);
})
.closed
.whenComplete(() {
if (mounted) {
setState(() {
_showPersBottomSheetCallBack = _showBottomSheet;
});
}
});
}
initialize the listener
void initState() {
super.initState();
_showPersBottomSheetCallBack = _showBottomSheet;
}
Call the method wherever you required
new RaisedButton(
onPressed: _showPersBottomSheetCallBack,
child: new Text("Persistent"),
),
Hope it helps !
Solution 6 - Material Design
Use the Code Below
Note : If You are using column then use mainAxisSize: MainAxisSize.min
// make isScrollControlled : true
// if using column then make - mainAxisSize: MainAxisSize.min
showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
return YourWidget();
}
)
Solution 7 - Material Design
Lately I found an workaround for this. By setting the canvasColor
property to Colors.transparent
in your app's theme, we can make the BottomSheet's overlay disappear.
return new MaterialApp(
title: 'MyApp',
theme: new ThemeData(
primarySwatch: Colors.blue,
canvasColor: Colors.transparent,
),
//...
);
Once you set this up, you may use ClipRRect or Decoration with rounded corners.
Solution 8 - Material Design
here is the simplest code working in 2021
showModalBottomSheet(
context: context,
isScrollControlled: true, // <-- make bottom sheet resize to content height
shape: RoundedRectangleBorder( // <-- for border radius
borderRadius: BorderRadius.only(
topLeft: Radius.circular(15.0),
topRight: Radius.circular(15.0),
),
),
builder: (BuildContext context) {
return Container() // <-- any widget you want
});
Solution 9 - Material Design
For changing the height of bottomsheet it's better to use the bottomsheet's constraints
and isScrollControlled
properties.
Like this:
showModalBottomSheet(
constraints: BoxConstraints.loose(Size(
MediaQuery.of(context).size.width,
MediaQuery.of(context).size.height * 0.75)), // <= this is set to 3/4 of screen size.
isScrollControlled: true, // <= set to true. setting this without constrains may cause full screen bottomsheet.
context: context,
builder: (context) => yourWidget()
);
For border radius use the shape
property:
showModalBottomSheet(
shape: const RoundedRectangleBorder(
borderRadius: BorderRadius.vertical(top: Radius.circular(45))), // <= set preferable radius.
context: context,
builder: (context) => yourWidget()
);
Solution 10 - Material Design
In the above code by @Shyju Madathil you need to add key in scaffold to make it work
return new Scaffold(
key: _scaffoldKey,
....
Solution 11 - Material Design
You can adjust the height by setting the height of your main container either by a constant ex : 800 or by using MediaQuery ex :
if i want to show only 2 /3 of the screen
MediaQuery.of(context).size.height -
(MediaQuery.of(context).size.height / 3)
for the radius first you have to set the
showModalBottomSheet(
backgroundColor: Colors.transparent,
and then you container color to White or any color you wanted , example :
return Container(
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.only(
topLeft: const Radius.circular(16),
topRight: const Radius.circular(16))),
child:
Solution 12 - Material Design
You can adjust the height by setting isScrollControlled: true
and wrapping the BottomSheet
inside FractionallySizedBox
. It would look something like this:
showModalBottomSheet<void>(
context: context,
//This
isScrollControlled: true,
builder: (BuildContext context) {
return StatefulBuilder(
builder: (BuildContext context, StateSetter state) {
return FractionallySizedBox(
//Here specify the high of the BottomSheet
heightFactor: 0.9,
child:BottomSheet(
.
.
.
.
.
.
));
});
});
Solution 13 - Material Design
Simple way to do this:
showModalBottomSheet(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.only(
topRight: Radius.circular(15),
topLeft: Radius.circular(15),
),
),
context: context,
builder: (context) {
return Wrap(
children: [
Container(
height: 40,
child: Center(
child: Text(
"Edit Profile",
style: TextStyle(
fontWeight: FontWeight.bold,
),
),`
),
),
],
);
});
Solution 14 - Material Design
This is my solution.It can adjust height and has a max height.If the content over max height.It can be scrolled
showModalBottomSheet<void>(
context: context,
isScrollControlled: true,
backgroundColor: Colors.white,
// elevation: 10,
shape: const RoundedRectangleBorder(
borderRadius: BorderRadius.only(
topLeft: Radius.circular(12),
topRight: Radius.circular(12),
)),
builder: (context) {
return ConstrainedBox(
constraints: const BoxConstraints(maxHeight: 300),
child: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Column(
children: List.generate(20, (index) => Text("data$index")),
)),
);
},
);