Created
January 31, 2019 12:11
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React Native Reanimated Spring
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| import React from 'react'; | |
| import { GestureHandler } from 'expo'; | |
| import { View } from 'react-native'; | |
| import Animated from 'react-native-reanimated'; | |
| const { PanGestureHandler, State } = GestureHandler; | |
| const { | |
| event, | |
| set, | |
| eq, | |
| cond, | |
| clockRunning, | |
| Clock, | |
| Value, | |
| stopClock, | |
| startClock, | |
| spring, | |
| debug, | |
| } = Animated; | |
| const runSpring = (value, vel, dragState, axis) => { | |
| const clock = new Clock(); | |
| const state = { | |
| finished: new Value(0), | |
| velocity: new Value(0), | |
| position: new Value(0), | |
| time: new Value(0), | |
| }; | |
| const config = { | |
| toValue: new Value(0), | |
| damping: 7, | |
| mass: 1, | |
| stiffness: 121.6, | |
| overshootClamping: false, | |
| restSpeedThreshold: 0.001, | |
| restDisplacementThreshold: 0.001, | |
| }; | |
| return cond(eq(dragState, State.END), [ | |
| cond(clockRunning(clock), 0, [ | |
| set(state.finished, 0), | |
| set(state.time, 0), | |
| set(state.position, value), | |
| set(state.velocity, vel), | |
| set(config.toValue, 0), | |
| debug(`Start clock ${axis}`, startClock(clock)), | |
| ]), | |
| cond( | |
| state.finished, | |
| debug(`Stop clock ${axis}`, stopClock(clock)), | |
| ), | |
| spring(clock, state, config), | |
| state.position, | |
| ], value); | |
| }; | |
| export default class Card extends React.Component { | |
| translationX = new Animated.Value(0); | |
| translationY = new Animated.Value(0); | |
| velocityX = new Animated.Value(0); | |
| velocityY = new Animated.Value(0); | |
| dragState = new Value(0); | |
| handleGestureEvent = event([ | |
| { | |
| nativeEvent: { | |
| velocityX: this.velocityX, | |
| velocityY: this.velocityY, | |
| translationX: this.translationX, | |
| translationY: this.translationY, | |
| state: this.dragState, | |
| }, | |
| }, | |
| ]); | |
| position = { | |
| x: runSpring(this.translationX, this.velocityX, this.dragState, 'X'), | |
| y: runSpring(this.translationY, this.velocityY, this.dragState, 'Y'), | |
| }; | |
| render() { | |
| return ( | |
| <View style={{ | |
| flex: 1, | |
| backgroundColor: '#eee', | |
| alignItems: 'center', | |
| justifyContent: 'center', | |
| }} | |
| > | |
| <PanGestureHandler | |
| onGestureEvent={this.handleGestureEvent} | |
| onHandlerStateChange={this.handleGestureEvent} | |
| > | |
| <Animated.View | |
| style={{ | |
| height: '80%', | |
| width: '80%', | |
| backgroundColor: '#fff', | |
| transform: [{ translateX: this.position.x, translateY: this.position.y }], | |
| }} | |
| /> | |
| </PanGestureHandler> | |
| </View> | |
| ); | |
| } | |
| } |
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