react-native-bottom-sheet-behavior

react-native wrapper for android BottomSheetBehavior, supports FloatingActionButton.

Demo

See the Google Maps gif implementation

v1.0.0

This major release v1.0.0 supports anchor state, which means that you can have a middle state between collapsed and expanded.

This version now uses a custom BottomSheetBehavior implementation from miguelhincapie/CustomBottomSheetBehavior which is basically a fork from the original design-support, but with anchor state support and colors management, even though is custom implementation, old version should work as before, and you can also disable the anchor state with anchorEnabled prop which is disabled by default.

Components

The following components are included in this package:

• CoordinatorLayout
• BottomSheetBehavior
• FloatingActionButton
• MergedAppBarLayout
• ScrollingAppBarLayout
• BackdropBottomSheet
• BottomSheetHeader

NOTE We expose some android core components such as CoordinatorLayout, AppBarLayout, FloatingActionButton, but they are NOT meant to be general purposed, and it may not work out of the context of this library, so use at your own risk.

iOS Alternative

If you are wondering some iOS alternative, i highly recommend react-native-interactable by wix, you can see their google maps approach here, which is very easy to get started.

Install

$ npm install react-native-bottom-sheet-behavior

Install with RNPM

$ react-native link react-native-bottom-sheet-behavior

Install Manually

Edit the current files as follows.

android/settings.gradle

include ':app'

+   include ':react-native-bottom-sheet-behavior'
+   project(':react-native-bottom-sheet-behavior').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-bottom-sheet-behavior/android')

android/app/build.gradle

    dependencies {
        implementation fileTree(dir: "libs", include: ["*.jar"])
        implementation "com.android.support:appcompat-v7:${rootProject.ext.supportLibVersion}"
+       implementation "com.android.support:design:${rootProject.ext.supportLibVersion}"
        implementation "com.facebook.react:react-native:+"  // From node_modules
+       implementation project(':react-native-bottom-sheet-behavior')
    }

MainApplication.java

+   import com.bottomsheetbehavior.BottomSheetBehaviorPackage;

    public class MainApplication extends Application implements ReactApplication {

      @Override
      protected List<ReactPackage> getPackages() {
        return Arrays.<ReactPackage>asList(
            new MainReactPackage(),
+           new BottomSheetBehaviorPackage()
        );
      }
    }

Usage

You will need to wrap your view into a CoordinatorLayout to make it work.

    render() {
      return (
          <CoordinatorLayout style={{flex: 1}}>
            <View style={{ flex: 1, backgroundColor: 'transparent' }}></View>
            <BottomSheetBehavior
              ref='bottomSheet'
              peekHeight={70}
              hideable={false}
              state={BottomSheetBehavior.STATE_COLLAPSED}>
              <View style={{backgroundColor: '#4389f2'}}>
                <View style={{padding: 26}}>
                  <Text>BottomSheetBehavior!</Text>
                </View>
                <View style={{height: 200, backgroundColor: '#fff'}} />
              </View>
            </BottomSheetBehavior>
            <FloatingActionButton autoAnchor ref="fab" />
          </CoordinatorLayout>
      )
    }

NOTE Make sure that your view has a backgroundColor style to prevent some "bugs" when rendering the container.

Components Order

You should follow this component order.

render() {
  return (
    <CoordinatorLayout>
      <ScrollingAppBarLayout>
        <ToolbarAndroid />
      </ScrollingAppBarLayout>
      <View>Main Content</View>
      <BackdropBottomSheet />
      <BottomSheetBehavior />
      <MergedAppBarLayout
        <ToolbarAndroid />
      </MergedAppBarLayout>
      <FloatingActionButton />
    </CoordinatorLayout>
  )
}

Events

In order to get the current bottom sheet state or offset, you can listen to onStateChange or onSlide respectively.

  <BottomSheetBehavior
    onSlide={(e) => console.log(e.nativeEvent.offset)}
    onStateChange={(e) => console.log(e.nativeEvent.state)}
  />

AppBarLayouts

We provide some custom AppBars that has custom behaviors, they automatically connects with BottomSheetBehavior in order to connects with ToolbarAndroid and toggle visibility, both AppBars can also manager StatusBar backgrounds.

Currently, AppBars only supports ToolbarAndroid as a child, you may have some troubles trying to render a custom View.

ScrollingAppBarLayout

This behavior hides and sets the StatusBar background to transparent when you starting dragging the BottomSheet, and reappears when the BottomSheet backs to the collapsed state, setting back the StatusBar background color with statusBarColor prop.

MergedAppBarLayout

The MergedAppBarLayout behavior appears when the BottomSheet reaches the anchor state (or expanded state if you're not using anchorEnabled). When the BottomSheet is getting over the MergedAppBar, it will partially sets the height of ToolbarAndroid revealing the mergedColor prop, and when the BottomSheet is fully expanded, it sets the ToolbarAndroid with the toolbarColor prop.

<MergedAppBarLayout
  translucent={true}
  barStyle='light-content'
  barStyleTransparent='dark-content'
  mergedColor='#1abc9c'
  toolbarColor='#34495e'
  statusBarColor='#2c3e50'>
  <ToolbarAndroid
    navIconName="md-arrow-back"
    overflowIconName='md-more'
    title='React Native Bar!'
    titleColor='#fff'
  />
</MergedAppBarLayout>

Translucent App Bars

Both AppBars supports translucent status bar, you can enable with translucent prop, which will basically adds top margins and NOT change the translucent itself, you should handle the translucent directely on the react-native StatusBar component.

FloatingActionButton

If you are using FloatingActionButton, the autoAnchor prop will automatically connect to BottomSheetBehavior, in order to follow when it's dragging.

<FloatingActionButton autoAnchor />

You still can do it manually though, by doing this.

  componentDidMount() {
    this.refs.fab.setAnchorId(this.refs.bottomSheet)
  }

FloatingActionButton's has a custom behavior that hides when closely reaches MergedAppBarLayout.

Support for react-native-vector-icons

You can also use react-native-vector-icons on FloatingActionButton, which will automatically load the icon for you.

  import Icon from 'react-native-vector-icons/Ionicons'

  ...

  render() {
    return (
      <FloatingActionButton icon={"directions"} iconProvider={Icon} />
    )
  }

You can check GoogleMapsView.js example.

BackdropBottomSheet

This component is rendered behind the BottomSheetBehavior, and behave like a parallax when BottomSheet is dragging. you should pass a fixed height prop that may match with anchorPoint prop from BottomSheet, in order to achieve a full screen view when reaches the anchor state.

BottomSheetHeader

This component abstracts color management between BottomSheet states on the native side, it will find all and components recursively and handles everything out the box.

NestedScrollView

If you are not using the anchor point, and want to add some nested scroll, you will need to install the react-native-nested-scroll-view to allows you to scroll inside bottom sheet continuously.

Note the react-native-nested-scroll-view is only useful when you are NOT using the anchorPoint.

NestedScrollView.js example

API

BottomSheetBehavior properties

Prop	Description	Default Value
state	The state of the bottom sheet	4 (STATE_COLLAPSED)
peekHeight	Peek Height value in DP	50
hideable	Allow hide the bottom sheet	false
anchorEnabled	Enabled anchor point	false
anchorPoint	Anchor point where the bottom sheet should stay between collapsed and expanded	300
elevation	Elevation shadow	0
onStateChange	Callback when bottom sheet state changed
onSlide	Callback continuously called while the user is dragging the bottom sheet

BottomSheetBehavior States

State	Description
1	STATE_DRAGGING
2	STATE_SETTLING
3	STATE_EXPANDED
4	STATE_COLLAPSED
5	STATE_HIDDEN
6	STATE_ANCHOR_POINT

BottomSheetBehavior actions

Method	Description
setBottomSheetState	Sets the bottom sheet state

FloatingActionButton properties

Prop	Description	Default Value
src	Drawable file under the drawable android folder
autoAnchor	Attachs the button on bottom sheet automatically	false
icon	react-native-vector-icons name
iconProvider	Icon package provided by react-native-vector-icons
iconColor	Icon color
iconColorExpanded	Icon expanded color when used by BottomSheetHeader
backgroundColor	Background color
backgroundColorExpanded	Background expanded color used by BottomSheetHeader
hidden	Hides FloatingActionButton	false
rippleEffect	Enable rippleEffect	true
rippleColor	Ripple color
elevation	Elevation shadow	18
onPress	Callback called when touch is released

FloatingActionButton actions

Method	Description
show	This method will animate the button show if the view has already been laid out
hide	This method will animate the button hide if the view has already been laid out
setAnchorId	Attachs the button on bottom sheet by passing it as a argument (no needed if autoAnchor is set true)

ScrollingAppBarLayout properties

Prop	Description
height	Height of ScrollingAppBarLayout
statusBarColor	Active status bar color
translucent	Adds top margins on the AppBar to not draw behind the status bar
barStyle	Status Bar style, (default, light-content, dark-content), used when the ScrollingAppBarLayout is present
barStyleTransparent	Status Bar style, (default, light-content, dark-content), used when the ScrollingAppBarLayout is not present and the StatusBar is transparent

MergedAppBarLayout properties

Prop	Description
height	Height of ScrollingAppBarLayout
mergedColor	Merged color when the bottom sheet is overlaying with ToolbarAndroid
toolbarColor	The final ToolbarAndroid color when the bottom sheet is fully expanded
statusBarColor	Active status bar color when bottom sheet is expanded
translucent	Adds top margins on the AppBar to not draw behind the status bar
barStyle	Status Bar style, (default, light-content, dark-content), used when the BottomSheet is fully expanded
barStyleTransparent	Status Bar style, (default, light-content, dark-content), used when the AppBar is transparent

BottomSheetHeader properties

Prop	Description
textColorExpanded	The state of the bottom sheet
backgroundColor	Background color when collased
backgroundColorExpanded	Background color when anchored or expanded
onPress	Callback called when header touch is released

License

MIT