Cross platform scrollable bottom sheet with virtualization support, running at 60 FPS and fully implemented in JS land
npm install @snooper/rn-scroll-bottom-sheetCross platform scrollable bottom sheet with virtualisation support and fully native animations, that integrates with all core scrollable components from React Native: FlatList, ScrollView and SectionList. Also, it's 100% compatible with Expo.
 |  |
:---------------------:|:------------------:|
FlatList and SectionList components are 1st class citizens, as well as ScrollView#### npm
``sh`
npm i @snooper/rn-scroll-bottom-sheet
#### yarn
`sh`
yarn add @snooper/rn-scroll-bottom-sheet
If you don't use Expo, you also need to install react-native-gesture-handler and react-native-reanimated libraries along with this one.
It's recommended you install a version of gesture handler equal or higher than 1.6.0, and for reanimated, equal or higher than 1.7.0. Otherwise you may run into unexpected errors.
widgets for horizontal mode. Unfortunately, not all _interactable_ React Native components are compatible with this library. This is due to some limitations on react-native-gesture-handler, which this library uses behind the scenes. For that, please follow this compatibility table:| Import | Touchable | Flatlist |
| ------------------------- | -------- | ------- |
| react-native | iOS | 🚫 |
| react-native-gesture-handler | Android | Android, iOS|
$3
As you can see on the table, for any touchable component (TouchableOpacity, TouchableHighlight, ...) you need to have different imports depending on the platform. The below is a snippet you may find useful to abstract that into a component.`js
import React from "react";
import { Platform, TouchableOpacity } from "react-native";
import { TouchableOpacity as RNGHTouchableOpacity } from "react-native-gesture-handler";const BottomSheetTouchable = (props) => {
if (Platform.OS === "android") {
return (
)
}
return;
};
export default BottomSheetTouchable;
`$3
For this mode to work properly, you have to import from react-native-gesture-handler instead of react-native.`js
import { FlatList } from 'react-native-gesture-handler';...
`
Usage
The below is an example using the core
from React Native as the scrollable component.`tsx
import React from 'react';
import { Dimensions, StyleSheet, Text, View } from 'react-native';
import ScrollBottomSheet from '@snooper/rn-scroll-bottom-sheet';const windowHeight = Dimensions.get('window').height;
function Example() {
return (
// If you are using TS, that'll infer the renderItem
item type
componentType="FlatList"
snapPoints={[128, '50%', windowHeight - 200]}
initialSnapIndex={2}
renderHandle={() => (
)}
data={Array.from({ length: 200 }).map((_, i) => String(i))}
keyExtractor={i => i}
renderItem={({ item }) => (
{ Item ${item}}
)}
contentContainerStyle={styles.contentContainerStyle}
/>
);
}const styles = StyleSheet.create({
container: {
flex: 1,
},
contentContainerStyle: {
padding: 16,
backgroundColor: '#F3F4F9',
},
header: {
alignItems: 'center',
backgroundColor: 'white',
paddingVertical: 20,
borderTopLeftRadius: 20,
borderTopRightRadius: 20
},
panelHandle: {
width: 40,
height: 2,
backgroundColor: 'rgba(0,0,0,0.3)',
borderRadius: 4
},
item: {
padding: 20,
justifyContent: 'center',
backgroundColor: 'white',
alignItems: 'center',
marginVertical: 10,
},
});
`Props
There are 2 types of props this component receives: explicit and inherited.$3
This is the list of exclusive props that are meant to be used to customise the bottom sheet behaviour.
| Name | Required | Type | Description |
| ------------------------- | -------- | ------- | ------------|
|
| yes | string | 'FlatList', 'ScrollView', or 'SectionList' |
| snapPoints | yes | Array | Array of numbers and/or percentages that indicate the different resting positions of the bottom sheet (in dp or %), starting from the top. If a percentage is used, that would translate to the relative amount of the total window height. If you want that percentage to be calculated based on the parent available space instead, for example to account for safe areas or navigation bars, use it in combination with topInset prop |
| initialSnapIndex | yes | number | Index that references the initial resting position of the drawer, starting from the top |
| renderHandle | yes | () => React.ReactNode | Render prop for the handle, should return a React Element |
| onSettle | no | (index: number) => void | Callback that is executed right after the bottom sheet settles in one of the snapping points. The new index is provided on the callback |
| animatedPosition | no | Animated.Value | Animated value that tracks the position of the drawer, being: 0 => closed, 1 => fully opened |
| animationConfig | no | { duration: number, easing: Animated.EasingFunction } | Timing configuration for the animation, by default it uses a duration of 250ms and easing fn Easing.inOut(Easing.linear) |
| topInset | no | number | This value is useful to provide an offset (in dp) when applying percentages for snapping points |
| innerRef | no | RefObject | Ref to the inner scrollable component (ScrollView, FlatList or SectionList), so that you can call its imperative methods. For instance, calling scrollTo on a ScrollView. In order to so, you have to use getNode as well, since it's wrapped into an _animated_ component: ref.current.getNode().scrollTo({y: 0, animated: true}) |
| containerStyle | no | StyleProp | Style to be applied to the container (Handle and Content) |
$3
Depending on the value of componentType chosen, the bottom sheet component will inherit its underlying props, being one of
FlatListProps, ScrollViewProps or SectionListProps, so that you can tailor the scrollable content behaviour as per your needs.Methods
####
snapTo(index)Imperative method to snap to a specific index, i.e.
js
bottomSheetRef.current.snapTo(0)
` refers to the ref passed to the ScrollBottomSheet component.Limitations
At the moment, the component does not support updating snap points via state, something you may want to achieve when changing device orientation for instance. A temporary workaround is to leverage React keys to force a re-mount of the component. This is some illustrative code to give you an idea how you could handle an orientation change with keys:`js
import { useDimensions } from '@react-native-community/hooks'const useOrientation = () => {
const { width, height } = useDimensions().window;
if (height > width) {
return 'portrait'
}
return 'landscape'
};
const OrientationAwareBS = () => {
const orientation = useOrientation();
const snapPoints = {
portrait: [...],
landscape: [...]
};
return (
componentType="FlatList";
snapPoints={snapPoints[orientation]};
initialSnapIndex={2};
...
/>;
)
}
`Example
There is an Expo example application that you can play with to get a good grasp on the different customisation options. In case of Android, you can directly open the project here. For iOS, head to the example folder and run the project locally:bash
$ npm install$ npm start
``MIT