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index.js
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index.js
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import React, { Component } from "react";
import {
View,
ScrollView,
Animated,
StyleSheet,
ViewProperties,
TouchableOpacity
} from "react-native";
export default class TabbedControl extends Component {
state = {
scrollX: new Animated.Value(0),
containerWidth: 0
};
onIndexChange(){
// TODO: Update state
}
render() {
const { tabs = [], color = "#4549D1", onIndexChange = onIndexChange(0) } = this.props;
const numberOfSegments = tabs.length;
const { containerWidth } = this.state;
const activeMargin = this.state.scrollX.interpolate({
inputRange: [0, (numberOfSegments - 1) * containerWidth],
outputRange: [
0,
(numberOfSegments - 1) * containerWidth / numberOfSegments
]
});
return (
<View
style={styles.card}
onLayout={event => {
const { width } = event.nativeEvent.layout;
this.setState({ containerWidth: width });
}}
>
<View style={styles.container}>
<View style={styles.headerContainer}>
{tabs.map((segment, index) =>
{
return this.renderSegment(numberOfSegments, segment.title, index);
}
)}
</View>
<Animated.View
style={[
styles.animatedSeparator,
{
width: containerWidth / numberOfSegments,
marginLeft: activeMargin,
backgroundColor: color
}
]}
/>
<View style={styles.separatorStyle} />
<ScrollView
scrollEventThrottle={16}
onScroll={this.handleOnScroll}
horizontal={true}
pagingEnabled={true}
showsHorizontalScrollIndicator={false}
ref={ref => (this.scrollView = ref)}
>
{tabs.map((segment, index) => {
return (
<View style={{ width: containerWidth }} key={index}>
{segment.view && segment.view(segment.viewProps)}
</View>
);
})}
</ScrollView>
</View>
</View>
);
}
renderSegment = (numberOfSegments, title, index) => {
const input = Array.from(
{ length: numberOfSegments },
(value, key) => key
).map(key => key * this.state.containerWidth);
const output = Array.from(
{ length: numberOfSegments },
(value, key) => key
).map(key => (key === index ? "black" : "#828282"));
if (output.length < 2) {
return <View key={index} />;
}
const color = this.state.scrollX.interpolate({
inputRange: input,
outputRange: output,
extrapolate: "clamp"
});
return (
<TouchableOpacity
style={styles.headerItem}
onPress={() => {
// TODO: Update state
this.props.onIndexChange(index);
this.scrollView.scrollTo({
x: index * this.state.containerWidth,
y: 0,
animated: true
});
}}
key={index}
>
<Animated.Text style={[styles.title, { color }]}>{title}</Animated.Text>
</TouchableOpacity>
);
};
// TODO: Update selectedIndex
handleOnScroll = x => {
const mover = Animated.event([
{ nativeEvent: { contentOffset: { x: this.state.scrollX } } }
]);
mover(x);
};
}
const styles = StyleSheet.create({
card: {
width: "100%",
backgroundColor: "white",
borderRadius: 6,
shadowColor: "black",
shadowOffset: { height: 4, width: 0 },
shadowOpacity: 0.1,
elevation: 3
},
separatorStyle: {
height: 1,
backgroundColor: "#E0E0E0"
},
container: {
overflow: "hidden"
},
headerContainer: {
flexDirection: "row",
justifyContent: "space-between"
},
headerItem: {
flex: 1,
alignItems: "center",
paddingVertical: 16
},
title: {
fontWeight: "600",
fontSize: 16,
textAlign: "center"
},
animatedSeparator: {
height: 2
}
});