rastapasta / react-native-swipe-gestures

4-directional swipe gestures for react-native

react-native-swipe-gestures

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

Installation

npm i -S react-native-swipe-gestures

Usage

'use strict';

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

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

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 properties 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)
gestureIsClickThreshold	Number	5	Absolute distance that should be breached for the gesture to not be considered a click (dx or dy properties of gestureState)

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