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index.js
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import React, { Component } from 'react'
import { Animated, PanResponder, View } from 'react-native'
import PropTypes from 'prop-types'
const truty = () => true
const noop = () => {}
class BouncyView extends Component {
static propTypes = {
onPress: PropTypes.func,
scale: PropTypes.number,
moveSlop: PropTypes.number,
delay: PropTypes.number
}
static defaultProps = {
onPress: noop,
scale: 1.1, // Max scale of animation
moveSlop: 15, // Slop area for press
delay: 40 // Animation delay in miliseconds
}
state = {
scale: new Animated.Value(1)
}
componentWillMount () {
this.panResponder = PanResponder.create({
onStartShouldSetPanResponder: truty,
onStartShouldSetPanResponderCapture: truty,
onMoveShouldSetPanResponder: truty,
onMoveShouldSetPanResponderCapture: truty,
onPanResponderTerminationRequest: truty,
onPanResponderTerminate: noop,
onPanResponderGrant: () => {
Animated.timing(
this.state.scale,
{
toValue: this.props.scale,
friction: 1,
duration: 200
}
).start()
},
onPanResponderRelease: (evt, gestureState) => {
const { moveSlop, delay, onPress } = this.props
const isOutOfRange = gestureState.dy > moveSlop || gestureState.dy < (-moveSlop) || gestureState.dx > moveSlop || gestureState.dx < (-moveSlop)
if (!isOutOfRange) {
setTimeout(() => {
Animated.spring(
this.state.scale,
{
toValue: 1,
friction: 1,
duration: 200
}
).start()
onPress(evt)
}, delay)
}
}
})
}
render () {
const { scale } = this.state
const { children, style, ...rest } = this.props
return (
<Animated.View
style={[{
transform: [
{
scale
}
]
}, style
]} {...rest}>
<View {...this.panResponder.panHandlers}>
{children}
</View>
</Animated.View>
)
}
}
export default BouncyView