rn-swipe-gestures

rn-swipe-gestures

React Native component for handling swipe gestures in up, down, left and right direction.

Installation

npm i -S rn-swipe-gestures

Usage

'use strict';

import React from 'react';
import { View, Text } from 'react-native';
import GestureRecognizerView, { swipeDirections } from 'rn-swipe-gestures';

class SomeComponent extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      myText: 'I\'m ready to get swiped!',
      gestureName: 'none',
      backgroundColor: '#fff'
    };
  }

  onSwipeUp(gestureState) {
    this.setState({ myText: 'You swiped up!' });
  }

  onSwipeDown(gestureState) {
    this.setState({ myText: 'You swiped down!' });
  }

  onSwipeLeft(gestureState) {
    this.setState({ myText: 'You swiped left!' });
  }

  onSwipeRight(gestureState) {
    this.setState({ myText: 'You swiped right!' });
  }

  onSwipe(gestureName, gestureState) {
    const {SWIPE_UP, SWIPE_DOWN, SWIPE_LEFT, SWIPE_RIGHT} = swipeDirections;
    this.setState({ gestureName: gestureName });
    switch (gestureName) {
      case SWIPE_UP:
        this.setState({ backgroundColor: 'red' });
        break;
      case SWIPE_DOWN:
        this.setState({ backgroundColor: 'green' });
        break;
      case SWIPE_LEFT:
        this.setState({ backgroundColor: 'blue' });
        break;
      case SWIPE_RIGHT:
        this.setState({ backgroundColor: 'yellow' });
        break;
    }
  }

  render() {
    
    const config = {
      velocityThreshold: 0.3,
      directionalOffsetThreshold: 80
    };

    return (
      <GestureRecognizerView
        onSwipe={(direction, state) => this.onSwipe(direction, state)}
        onSwipeUp={(state) => this.onSwipeUp(state)}
        onSwipeDown={(state) => this.onSwipeDown(state)}
        onSwipeLeft={(state) => this.onSwipeLeft(state)}
        onSwipeRight={(state) => this.onSwipeRight(state)}
        config={config}
        style={{
          flex: 1,
          backgroundColor: this.state.backgroundColor
        }}
        >
        <Text>{this.state.myText}</Text>
        <Text>onSwipe callback received gesture: {this.state.gestureName}</Text>
      </GestureRecognizerView>
    );
  }
}

export default SomeComponent;

Config

Can be passed within optional config property.

Params	Type	Default	Description
velocityThreshold	Number	0.3	Velocity that has to be breached in order for swipe to be triggered (vx and vy peroperties of gestureState)
directionalOffsetThreshold	Number	80	Absolute offset that shouldn't be breached for swipe to be triggered (dy for horizontal swipe, dx for vertical swipe)
detectSwipeUp	Boolean	true	enable/disable swipe up gesture detection
detectSwipeDown	Boolean	true	enable/disable swipe down gesture detection
detectSwipeLeft	Boolean	true	enable/disable swipe left gesture detection
detectSwipeRight	Boolean	true	enable/disable swipe right gesture detection

Methods

onSwipe(gestureName, gestureState)

Params	Type	Description
gestureName	String	Name of the gesture (look example above)
gestureState	Object	gestureState received from PanResponder

onSwipeUp(gestureState)

Params	Type	Description
gestureState	Object	gestureState received from PanResponder

onSwipeDown(gestureState)

Params	Type	Description
gestureState	Object	gestureState received from PanResponder

onSwipeLeft(gestureState)

Params	Type	Description
gestureState	Object	gestureState received from PanResponder

onSwipeRight(gestureState)

Params	Type	Description
gestureState	Object	gestureState received from PanResponder