Sliding up panel

React Native draggable sliding up panel purly implemented in Javascript. Inspired by AndroidSlidingUpPanel. Works nicely on any platforms.

Demo: Expo | web

Dependencies

• React >= 16.
• rn-sliding-up-panel is built with React Native 0.47 but it may work with older versions since this is pure Javascript.

Installation

npm install --save rn-sliding-up-panel

or if you are using yarn

yarn add rn-sliding-up-panel

Example

import React from 'react';
import {View, Button, Text} from 'react-native';

import SlidingUpPanel from 'rn-sliding-up-panel';

const styles = {
  container: {
    flex: 1,
    backgroundColor: 'white',
    alignItems: 'center',
    justifyContent: 'center'
  }
}

class MyComponent extends React.Component {
  render() {
    return (
      <View style={styles.container}>
        <Button title='Show panel' onPress={() => this._panel.show()} />
        <SlidingUpPanel ref={c => this._panel = c}>
          <View style={styles.container}>
            <Text>Here is the content inside panel</Text>
            <Button title='Hide' onPress={() => this._panel.hide()} />
          </View>
        </SlidingUpPanel>
      </View>
    )
  }
}

More:

• ScrollView insides the panel
• Bottom sheet
• Determine current position of panel

Props

Property	Type	Description
animatedValue	Animated.Value	An Animated.Value number between the top and bottom of draggable range. This number represents the position of the panel. If you update this prop, the panel will correspondingly update to the frame at that progress value. Default to Animated.Value(0) (Hidden at bottom of screen).
draggableRange	{top: number, bottom: number}	Boundary limits for draggable area. top default to visible height of device, bottom default to 0.
snappingPoints	number[]	Must be an incremental array of number and all values must be within the top & bottom of draggableRange.
minimumVelocityThreshold	number	Velocity threshold in pixel/s to trigger the fling animation after you release finger. Default is 0.1.
minimumDistanceThreshold	number	Distance threshold in pixel (virtual, not physical) to trigger the fling animation after you release finger. Default is 0.24.
height	number	Height of panel. Typically this should equal to the top value of draggablerange.
friction	number	Determines how quickly the fling animation settles down and stops. The higher the value, the faster the velocity decreases. Default is 0.998.
backdropOpacity	number	Opacity of the backdrop when the panel is active. Default is 0.75.
containerStyle	Style	Custom style for the container.
backdropStyle	Style	Custom style for the backdrop.
showBackdrop	boolean	Controls the visibility of backdrop. Default true.
allowMomentum	boolean	If false, panel will not continue to move when you release your finger.
allowDragging	boolean	Default true. Setting this to false to disable dragging.
onBackButtonPress	() => boolean	By default when you press back button (Android) the panel will be closed (Move to bottom position of draggableRange). Implement this function if you want to custom the behavior. Returning true means the event has been handled.
onDragStart	(position: number, gestureState: GestureState) => void	Called when the panel is about to start dragging.
onDragEnd	(position: number: gestureState: GestureState) => void	Called when you release your finger.
onMomentumDragStart	(position: number) => void	Called when the momentum drag starts. Works exactly the same way of ScrollView#onMomentumScrollBegin.
onMomentumDragEnd	(position: number) => void	Called when the momentum drag ends. Works exactly the same way of ScrollView#onMomentumScrollEnd.
children	React.Element | Function	Accepts passing a function as component. Invoked with dragHandlers (that can be passed into another View like this <View {...dragHandlers}>) when the panel is mounted. Useful when you want only a part of your content becomes the drag handler.

A gestureState (is forwarded from PanResponder's callbacks) object has the following:

• stateID - ID of the gestureState - persisted as long as there at least one touch on screen
• moveX - the latest screen coordinates of the recently-moved touch
• moveY - the latest screen coordinates of the recently-moved touch
• x0 - the screen coordinates of the responder grant
• y0 - the screen coordinates of the responder grant
• dx - accumulated distance of the gesture since the touch started
• dy - accumulated distance of the gesture since the touch started
• vx - current velocity of the gesture
• vy - current velocity of the gesture
• numberActiveTouches - Number of touches currently on screen

Notes:

• Except children, all other properties are optional.
• Call show() or hide() won't trigger onMomentum* events.
• If snappingPoints is set, the panel will always either snaps to top, bottom or a closest possible value of it.

Methods

show(value?: number | Object):

Programmatically move panel to a given value. Accepts a number or an object that may have the following options:

• toValue: The value that the panel will move to.
• velocity: Initial velocity of the animation.

Note: Calling show() without any parameter will showmove the panel to top position (of draggableRange).

hide():

Move the panel to the bottom position of draggable range. Note: This method is triggered if you touch the backdrop (If it's visible).

scrollIntoView(node: number):

Typically you don't need to use this method, But if an element is stuck under the keyboard or out of view, you can use this ensure it is visible within the viewable area.

Note:

• The element must be in the subtree of the panel component.
• Node can be obtained by using findNodeHandle.