Created
January 6, 2018 12:56
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import React, { Component } from 'react'; | |
import { | |
StyleSheet, | |
Image, // we want to use an image | |
PanResponder, // we want to bring in the PanResponder system | |
Animated // we wil be using animated value | |
} from 'react-native'; | |
export default class Briliant extends Component { | |
constructor(props) { | |
super(props); | |
this.state = { | |
pan: new Animated.ValueXY(), | |
scale: new Animated.Value(1) | |
}; | |
} | |
componentWillMount() { | |
this._panResponder = PanResponder.create({ | |
onMoveShouldSetResponderCapture: () => true, | |
onMoveShouldSetPanResponderCapture: () => true, | |
onPanResponderGrant: (e, gestureState) => { | |
// Set the initial value to the current state | |
this.state.pan.setOffset({x: this.state.pan.x._value, y: this.state.pan.y._value}); | |
this.state.pan.setValue({x: 0, y: 0}); | |
Animated.spring( | |
this.state.scale, | |
{ toValue: 1.1, friction: 3 } | |
).start(); | |
}, | |
// When we drag/pan the object, set the delate to the states pan position | |
onPanResponderMove: Animated.event([ | |
null, {dx: this.state.pan.x, dy: this.state.pan.y}, | |
]), | |
onPanResponderRelease: (e, {vx, vy}) => { | |
// Flatten the offset to avoid erratic behavior | |
this.state.pan.flattenOffset(); | |
Animated.spring( | |
this.state.scale, | |
{ toValue: 1, friction: 3 } | |
).start(); | |
} | |
}); | |
} | |
render() { | |
// Destructure the value of pan from the state | |
let { pan, scale } = this.state; | |
// Calculate the x and y transform from the pan value | |
let [translateX, translateY] = [pan.x, pan.y]; | |
let rotate = '0deg'; | |
// Calculate the transform property and set it as a value for our style which we add below to the Animated.View component | |
let imageStyle = {transform: [{translateX}, {translateY}, {rotate}, {scale}]}; | |
return ( | |
<Animated.View style={imageStyle} {...this._panResponder.panHandlers}> | |
<Image style={styles.gems} source={require('./../media/gems/briliant.png')} /> | |
</Animated.View> | |
); | |
} | |
} | |
const styles = StyleSheet.create({ | |
gems: { | |
width: 38, | |
height: 38 | |
} | |
}); |
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