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Animated Expo Skeleton
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import { StyleSheet, View, Dimensions } from "react-native"; | |
import { useEffect, memo } from "react"; | |
import { LinearGradient } from "expo-linear-gradient"; | |
import Animated, { | |
useSharedValue, | |
withTiming, | |
Easing, | |
interpolate, | |
useAnimatedStyle, | |
withRepeat, | |
} from "react-native-reanimated"; | |
interface SkeletonProps { | |
/** Styles */ | |
style: StyleProp<ViewStyle>; | |
} | |
// Colors | |
const DARK_COLOR = "#dddddd"; | |
const SHINE_COLOR = "#e8e8e8"; | |
// Window width | |
const { width } = Dimensions.get("window"); | |
// Create animated `Linear Gradient` | |
const AnimatedLG = Animated.createAnimatedComponent(LinearGradient); | |
const Skeleton = ({ style }: SkeletonProps) => { | |
// Position of the shining line | |
const sv = useSharedValue(0); | |
// Start animation | |
useEffect(() => { | |
sv.value = withRepeat( | |
withTiming(1, { | |
duration: 1500, | |
easing: Easing.inOut(Easing.quad), | |
}), | |
Infinity, | |
true | |
); | |
}, [sv]); | |
// Animate the movement horizontally | |
const animatedStyles = useAnimatedStyle(() => { | |
const translateX = interpolate(sv.value, [0, 1], [-width, width]); | |
return { | |
transform: [{ translateX }], | |
}; | |
}); | |
return ( | |
<View style={[styles.container, style]}> | |
<AnimatedLG | |
colors={[DARK_COLOR, SHINE_COLOR, SHINE_COLOR, DARK_COLOR]} | |
start={{ x: 0, y: 0 }} | |
end={{ x: 1, y: 0 }} | |
style={[styles.absoluteFill, animatedStyles]} | |
/> | |
</View> | |
); | |
}; | |
export default memo(Skeleton); | |
const styles = StyleSheet.create({ | |
container: { | |
backgroundColor: DARK_COLOR, | |
borderColor: SHINE_COLOR, | |
overflow: "hidden", | |
}, | |
absoluteFill: { | |
position: "absolute", | |
left: 0, | |
right: 0, | |
top: 0, | |
bottom: 0, | |
}, | |
}); |
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