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Description:

modal bottom sheet

Flutter Modal Bottom Sheet #

Create awesome and powerful modal bottom sheets.

Cupertino Modal
Multiple Modals
Material Modal
Bar Modal
Create your own

Try it #
Explore the Web Demo or clone the repository.
Why not showModalBottomSheet?
Inspired by showModalBottomSheet, it completes with some must-need features:

Support for inside scrollview + dragging down to close (showModalBottomSheet won't work correctly with scrollviews.
Support for WillPopScope to prevent closing the dialog.
Support for scroll to top when tapping status bar (iOS only)
Support for top SafeArea (not supported by showModalBottomSheet)
Cupertino modal bottom sheet
Create custom modal bottom sheet

First Steps #
How to install it? Follow Instructions
Material Modal BottomSheet #
showMaterialModalBottomSheet(
context: context,
builder: (context) => Container(),
)
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Generic params for all modal bottom sheets

Param
Description

bool expand = false
The expand parameter specifies id the modal bottom sheet will be full screen size or will fit the content child

bool useRootNavigator = false
The useRootNavigator parameter ensures that the root navigator is used to display the bottom sheet when set to true. This is useful in the case that a modal bottom sheet needs to be displayed above all other content but the caller is inside another Navigator.

bool isDismissible = true
The isDismissible parameter specifies whether the bottom sheet will be dismissed when user taps on the scrim.

Color barrierColor
The barrierColor parameter controls the color of the scrim for this route

bool enableDrag = true
The enableDrag parameter specifies whether the bottom sheet can be dragged up and down and dismissed by swiping downwards.

AnimationController secondAnimation
The secondAnimation parameter allows you to provide an animation controller that will be used to animate push/pop of the modal route. Using this param is advised against and will be probably removed in future versions

bool bounce = false
The bounce parameter specifies if the bottom sheet can go beyond the top boundary while dragging

Duration duration = const Duration(milliseconds: 400)
The duration of modal opening

double closeProgressThreshold = 0.6
The closeProgressThreshold specifies when the bottom sheet will be dismissed when user drags it.

Material params
The optional backgroundColor, elevation, shape, and clipBehavior parameters can be passed in to customize the appearance and behavior of material bottom sheets.
Using it with a scroll view inside
Assign the ModalScrollController.of(context) to your primary modal to sync the scroll with the modal's drag
showMaterialModalBottomSheet(
context: context,
builder: (context) => SingleChildScrollView(
controller: ModalScrollController.of(context),
child: Container(),
),
);
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Cupertino Modal BottomSheet #
iOS 13 came with an amazing new modal navigation and now it is available to use with Flutter.
showCupertinoModalBottomSheet(
context: context,
builder: (context) => Container(),
)
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See generic paramameter in the Material section above
Cupertino specific params
The optional backgroundColor parameters can be passed in to customize the backgroundColor cupertino bottom sheets.
Useful if you want a blurred transparent background as the example Cupertino Photo Share
CAUTION!: To animate the previous route some changes are needed. #

Why?
MaterialPageRoute and CupertinoPageRoute do not allow animated translation to/from routes that are not the same type.

Replace your current route class with MaterialWithModalsPageRoute.
Notice this route type behaves the same as MaterialPageRoute and supports custom PageTransitionsBuilder and PageTransitionsTheme.

How can I replace my current route?
1.
Using Navigator.of(context).push

Navigator.of(context).push(MaterialPageRoute(builder: (context) => Container()));`
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Replace it with
Navigator.of(context).push(MaterialWithModalsPageRoute(builder: (context) => Container()));
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2.
Using onGenerateRoute parameter of MaterialApp, CupertinoApp or Navigator

onGenerateRoute: (settings) {
...
return MaterialPageRoute(settings: settings, builder: (context) => Container());
},
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Replace it to
onGenerateRoute: (settings) {
...
return MaterialWithModalsPageRoute(settings: settings, builder: (context) => Container());
},
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3.
Using pageRouteBuilder parameter of WidgetApp

pageRouteBuilder: <T>(RouteSettings settings, WidgetBuilder builder) => MaterialWithModalsPageRoute<T>(settings: settings, builder: builder)
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4.
Using routes parameter from MaterialApp or CupertinoApp

Unfortunately this parameter uses MaterialPageRoute and CupertinoPageRoute respectively and cannot be changed.
You can modify the way you call the previous route with one of the previous methods or try option 2

Is there an alternative in case I can't change my current route? Yes!

Learn how to animate previous route with CupertinoScaffold:

Wrap previous route inside a CupertinoScaffold.
Example with routes parameter from MaterialApp or CupertinoApp

routes: <String, WidgetBuilder>{
'/previous_route_where_you_push_modal': (BuildContext context) => CupertinoScaffold(body: Container()),
},
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Push modal with this method

CupertinoScaffold.showCupertinoModalBottomSheet(context:context, builder: (context) => Container())
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Don't use this solution at the same time as MaterialWithModalsPageRoute

It supports native features as bouncing, blurred background, dark mode, stacking modals and inside navigation.
Push new views inside the modal bottom sheet #
a. If you want to push a new modal bottom sheet just call showCupertinoModalBottomSheet again (works with both options)
b. For inside navigaton add a new Navigator or CupertinoTabScaffold inside
c. Also it supports flutter features as WillPopScope to prevent the modal bottom to be closed.
Build other BottomSheets #
Try showBarModalBottomSheet for a bottomSheet with the appearance used by Facebook or Slack
Check in the example project showAvatarModalBottomSheet for how to create your own ModalBottomSheet
Questions #
Ask a question and ping me @jamesblasco
Found an issue or have a proposal? #
Create an issue
Roadmap #

Support closing by dragging fast on a modal with a scroll view.

Improve animation curves when user is not dragging.

Allow to set the initial size of the bottom sheet

Support hero animations Pull Request #2