Flutter Modal Bottom Sheet

Create awesome and powerful modal bottom sheets

Cupertino Modal	Multiple Modals	Material Modal	Bar Modal	Create your own

First Steps

How to install it? Follow Instructions

Material Modal BottomSheet

showMaterialModalBottomSheet(
  context: context,
  builder: (context, scrollController) => Container(),
})

What to use this over flutter showModalBottomSheet? showMaterialModalBottomSheet supports closing bottoms sheets by dragging down even if there is a scrollview inside. showModalBottomSheet won't work correctly with scrollviews

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 enableDrag parameter specifies if the bottom sheet can go beyond the top boundary while dragging

Material params

The optional backgroundColor, elevation, shape, and clipBehavior parameters can be passed in to customize the appearance and behavior of material bottom sheets.

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, scrollController) => Container(),
})

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.

There are two options:

OPTION 1. Recommended.

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 change my route class? See cases:

1. Using Navigator.of(context).push

Navigator.of(context).push(MaterialPageRoute(builder: (context) => Container()));`

Replace it with

 Navigator.of(context).push(MaterialWithModalsPageRoute(builder: (context) => Container()));

1. Using onGenerateRoute parameter of MaterialApp, CupertinoApp or Navigator

 onGenerateRoute: (settings) {
    ...
     return MaterialPageRoute(settings: settings, builder: (context) => Container());
 },

Replace it to

 onGenerateRoute: (settings) {
    ...
     return MaterialWithModalsPageRoute(settings: settings, builder: (context) => Container());
 },

1. Using pageRouteBuilder parameter of WidgetApp

pageRouteBuilder: <T>(RouteSettings settings, WidgetBuilder builder) => MaterialWithModalsPageRoute<T>(settings: settings, builder: builder)

1. Using routes parameter from MaterialApp or CupertinoApp

Unfortunately this routes are MaterialPageRoute and CupertinoPageRoute respectively and cannot be changes. You can change the way you call the previous route with one of the previous methods or try option 2

OPTION 2.

1. 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()),
    },

2. Push modal with this method

   CupertinoScaffold.showCupertinoModalBottomSheet(context:context, builder: (context) => Container())

These two options won't work correctly together.

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 two option)

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