Created
June 30, 2020 00:04
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A simple react native draggable card (down | up)
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import { StatusBar } from "expo-status-bar"; | |
import React, { useEffect } from "react"; | |
import { StyleSheet, Text, View, Animated, Easing } from "react-native"; | |
import { PanGestureHandler, State } from "react-native-gesture-handler"; | |
export default function App() { | |
let offset = 0; | |
let y = new Animated.Value(0); | |
const _onPanGestureEvent = Animated.event([{ nativeEvent: { translationY: y } }], { useNativeDriver: false }); | |
function onPanGesture({ nativeEvent }) { | |
let opened = false; | |
if (nativeEvent.oldState === State.ACTIVE) { | |
offset += nativeEvent.translationY; | |
if (nativeEvent.translationY >= 100) { | |
opened = true; | |
} else { | |
y.setValue(offset); | |
y.setOffset(0); | |
offset = 0; | |
} | |
Animated.timing(y, { | |
toValue: opened ? 380 : 0, | |
useNativeDriver: true, | |
duration: 200, | |
}).start(() => { | |
offset = opened ? 380 : 0; | |
y.setOffset(offset); | |
y.setValue(0); | |
}); | |
} | |
} | |
return ( | |
<View style={styles.container}> | |
<PanGestureHandler onHandlerStateChange={onPanGesture} onGestureEvent={_onPanGestureEvent}> | |
<Animated.View | |
style={[ | |
styles.card, | |
{ | |
transform: [ | |
{ | |
translateY: y.interpolate({ | |
inputRange: [0, 380], | |
outputRange: [0, 380], | |
extrapolate: "clamp", | |
}), | |
}, | |
], | |
}, | |
]} | |
/> | |
</PanGestureHandler> | |
</View> | |
); | |
} | |
const styles = StyleSheet.create({ | |
container: { | |
flex: 1, | |
backgroundColor: "#d8d8d8", | |
alignItems: "center", | |
padding: 30, | |
justifyContent: "center", | |
}, | |
card: { | |
height: 300, | |
borderRadius: 20, | |
width: "100%", | |
backgroundColor: "#fff", | |
}, | |
}); |
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