forked from shoutem/animation
/
FadeOut.js
64 lines (62 loc) · 1.54 KB
/
FadeOut.js
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import React, { Component } from 'react';
import { Animated, View } from 'react-native';
import { DriverShape } from './DriverShape';
/*
* FadeOut Component adds fade out effect to its children components.
* Connect it to driver and pass the input range to animate it.
* e.g.:
* ...
* const driver = new ScrollDriver();
*
* return (
* <ScrollView
* {...driver.scrollViewProps}
* >
* <FadeOut
* driver={driver}
* inputRange={[100,150]}
* >
* <Image />
* </FadeOut>
* </ScrollView>
* );
*
* ...
* Above code will create scroll dependent fade out animation over Image component
* from scroll 100, to scroll 150 where image is opaque at scroll 100,
* and fully transparent at scroll 150
*/
export class FadeOut extends Component {
static propTypes = {
/**
* An instance of animation driver, usually ScrollDriver
*/
driver: DriverShape.isRequired,
/**
* Components to which an effect will be applied
*/
children: React.PropTypes.node,
/**
* pair of [start, end] values from animation driver, how
* children would fade out
*/
inputRange: React.PropTypes.array,
style: React.PropTypes.object,
}
render() {
const { driver, children, inputRange = [0, 1], style } = this.props;
return (
<Animated.View
style={[style, {
opacity: driver.value.interpolate({
inputRange,
outputRange: [1, 0],
extrapolate: 'clamp',
}),
}]}
>
{children}
</Animated.View>
);
}
}