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import React from 'react';
import {
View,
FlatList,
Dimensions,
StyleSheet,
} from 'react-native';
import PropTypes from 'prop-types';
export class Walkthrough extends React.Component {
static propTypes = {
children: PropTypes.arrayOf(PropTypes.element).isRequired,
onChanged: PropTypes.func,
};
static defaultProps = {
onChanged: (() => null),
};
constructor(props) {
super(props);
this.itemWidth = Dimensions.get('window').width;
}
extractItemKey = (item) => `${this.props.children.indexOf(item)}`;
onScrollEnd = (e) => {
const { contentOffset } = e.nativeEvent;
const viewSize = e.nativeEvent.layoutMeasurement;
const pageNum = Math.floor(contentOffset.x / viewSize.width);
this.props.onChanged(pageNum);
};
renderItem = ({ item }) => (
<View style={[styles.item, { width: this.itemWidth }]}>
{item}
</View>
);
render = () => (
<FlatList
style={styles.list}
data={this.props.children}
onMomentumScrollEnd={this.onScrollEnd}
keyExtractor={this.extractItemKey}
pagingEnabled
horizontal
renderSeparator={() => null}
showsHorizontalScrollIndicator={false}
showsVerticalScrollIndicator={false}
directionalLockEnabled
renderItem={this.renderItem}
/>
);
}
const styles = StyleSheet.create({
list: {
flex: 1,
},
item: {
flex: 1,
},
});
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