How to Adjust the height and borderRadius of a BottomSheet In Flutter?

A bottomsheet is nothing but a material design bottom sheet. So in this article, We will go through how to Adjust the height and borderRadius of a BottomSheet in Flutter.

How to Adjust the height and borderRadius of a BottomSheet in Flutter?

The default height for BottomSheet is half the screen size. If you want your BottomSheet to EXPAND according to your content DYNAMICALLY.

showModalBottomSheet<dynamic>(
isScrollControlled: true,
context: context,
builder: (BuildContext bc) {
  return Wrap(
      children: <Widget>[...]
  )
 }
)

This will automatically expand the BottomSheet according to the content inside. For adding a radius on top of BottomSheet return the 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(),
                 ),
              )
      ]
   )
 }
)

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 and backgroundColor: Colors.transparent for the modal
• Provide a Container with required height: as root widget to the modal builder
• Provide BoxDecoration with required borderRadius for the Container

So the result will look like below:

Use showBottomSheet instead of showModalBottomSheet

So create a global key and a listener like the below:

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

 RaisedButton(
                  onPressed: _showPersBottomSheetCallBack,
                  child: new Text("Persistent"),
                ),

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,
  ),
  //...
);

So once you set this up, you may use ClipRRect Widget or Decoration with rounded corners.

You can use a Column Inside a SingleChildScrollView to dynamically change the height of the 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.

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)))),
   );
 }

Conclusion:

Thanks for being with us on a Flutter Journey !!!

So in this article, we have learned to Adjust the height and borderRadius of a BottomSheet in Flutter.

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