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Floating Animating Header with Scrolling Content (React Native)
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import React, { Component } from 'react' | |
import { Animated, ScrollView, StyleSheet, View } from 'react-native' | |
const HEADER_MAX_HEIGHT = 350 | |
const HEADER_MIN_HEIGHT = 175 | |
const SEARCH_AREA_HEIGHT = 100 | |
const SEARCH_AREA_MAX_TOP = HEADER_MAX_HEIGHT - (SEARCH_AREA_HEIGHT / 2) | |
const SEARCH_AREA_MIN_TOP = 120 | |
export default class App extends Component { | |
constructor () { | |
super() | |
this.state = { animatedHeaderValue: new Animated.Value(0) } | |
} | |
render () { | |
const animatedHeaderHeight = this.state.animatedHeaderValue.interpolate({ | |
inputRange: [0, (HEADER_MAX_HEIGHT - HEADER_MIN_HEIGHT)], | |
outputRange: [HEADER_MAX_HEIGHT, HEADER_MIN_HEIGHT], | |
extrapolate: 'clamp' | |
}) | |
const animatedHeaderZindex = this.state.animatedHeaderValue.interpolate({ | |
inputRange: [0, (HEADER_MAX_HEIGHT - HEADER_MIN_HEIGHT)], | |
outputRange: [0, 1], | |
extrapolate: 'clamp' | |
}) | |
const animatedSearchPosition = this.state.animatedHeaderValue.interpolate({ | |
inputRange: [0, (HEADER_MAX_HEIGHT - HEADER_MIN_HEIGHT)], | |
outputRange: [SEARCH_AREA_MAX_TOP, SEARCH_AREA_MIN_TOP], | |
extrapolate: 'clamp' | |
}) | |
const onScroll = () => { | |
return Animated.event([{ nativeEvent: {contentOffset: { y: this.state.animatedHeaderValue }} }]) | |
} | |
return ( | |
<View style={styles.container}> | |
<Animated.View style={[styles.header, {height: animatedHeaderHeight, zIndex: animatedHeaderZindex}]}></Animated.View> | |
<Animated.View style={[styles.searchArea, {top: animatedSearchPosition}]}/> | |
<ScrollView style={styles.scrollView} onScroll={onScroll()} scrollEventThrottle={16} showsVerticalScrollIndicator={false}> | |
<View style={[styles.lists]}> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
<View style={styles.listItem}/> | |
</View> | |
</ScrollView> | |
</View> | |
) | |
} | |
} | |
const styles = StyleSheet.create({ | |
container: { | |
flex: 1 | |
}, | |
header: { | |
width: '100%', | |
backgroundColor: 'orange', | |
position: 'absolute', | |
top: 0, | |
left: 0, | |
right: 0 | |
}, | |
scrollView: { | |
flex: 1, | |
paddingHorizontal: 15 | |
}, | |
searchArea: { | |
position: 'absolute', | |
height: SEARCH_AREA_HEIGHT, | |
marginHorizontal: 15, | |
left: 0, | |
right: 0, | |
zIndex: 1, | |
backgroundColor: 'blue' | |
}, | |
lists: { | |
marginTop: 430 | |
}, | |
listItem: { | |
height: 60, | |
marginBottom: 5, | |
backgroundColor: 'green' | |
} | |
}) |
Author
omeileo
commented
Aug 26, 2018
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