mbh-crew-react/Carousel.js at master · mybesthelper/mbh-crew-react · GitHub

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'use strict';

var React = require('react-native');
var {
  StyleSheet,
  View,
  Text,
  ScrollView,
} = React;

var Carousel = React.createClass({

  getDefaultProps() {
    return {
      hideIndicators: false,
      indicatorColor: '#000000',
      indicatorSize: 20,
      indicatorPosition: 20,
      inactiveIndicatorColor: '#999999',
      indicatorAtBottom: true,
      width: 375,
      initialPage: 0,
      indicatorSpace: 15
    };
  },

  getInitialState() {
    return {
      activePage: 0
    };
  },

  componentDidMount() {
    if (this.props.initialPage > 0) {
      var width = this.props.initialPage * this.props.width;
      this.setState({
        activePage: this.props.initialPage
      });
      this.refs.scrollview.scrollWithoutAnimationTo(0, this.props.initialPage * width);
    }
  },

  render() {

    return (
      <View style={{ flex: 1 }}>
        <ScrollView ref="scrollview"
          onScroll={this.onScroll}
          contentContainerStyle={styles.container}
          automaticallyAdjustContentInsets={false}
          horizontal={true}
          pagingEnabled={true}
          showsHorizontalScrollIndicator={false}
          bounces={false}
          onMomentumScrollEnd={this.onAnimationEnd}
        >
          {this.props.children}
        </ScrollView>
        {this.renderPageIndicator()}
      </View>
    );
  },

  onScroll(e) {
    var activePage = Math.round(e.nativeEvent.contentOffset.x / this.props.width);
    this.setState({
      activePage: activePage
    });
    if (this.props.onPageChange) {
      this.props.onPageChange(activePage);
    }
  },

  indicatorPressed(ind){
    this.setState({
      activePage:ind
    });

    this.refs.scrollview.scrollTo(0, ind * this.props.width);
  },

  renderPageIndicator() {
    if (this.props.hideIndicators === true) {
      return null;
    }

    var pageIndicatorStyles = StyleSheet.create({
      pageIndicatorTop: {
        top: this.props.indicatorPosition
      },
      pageIndicatorBottom: {
        bottom: this.props.indicatorPosition
      }
    });

    var indicators = [],
        indicatorStyle = this.props.indicatorAtBottom ? pageIndicatorStyles.pageIndicatorBottom : pageIndicatorStyles.pageIndicatorTop,
        style, position;

    position = {
      width: this.props.children.length * this.props.indicatorSpace,
    };
    position.left = (this.props.width - position.width) / 2;

    for (var i=0; i< this.props.children.length; i++) {
      style = i === this.state.activePage ? { color: this.props.indicatorColor } : { color: this.props.inactiveIndicatorColor };
      indicators.push(<Text style={[style, { fontSize: this.props.indicatorSize }]} key={i} onPress={this.indicatorPressed.bind(this,i)}>&bull;</Text>);
    }

    return (
      <View style={[styles.pageIndicator, position, indicatorStyle]}>
        {indicators}
      </View>
    );
  },

  onAnimationEnd(e) {
    var activePage = Math.round(e.nativeEvent.contentOffset.x / this.props.width);
    this.setState({
      activePage: activePage
    });
    if (this.props.onPageChange) {
      this.props.onPageChange(activePage);
    }
  }
});

var styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
  },
  page: {
    alignItems: 'center',
    justifyContent: 'center',
    borderWidth: 1,
  },
  pageIndicator: {
    position: 'absolute',
    flexDirection: 'row',
    flex: 1,
    justifyContent: 'space-around',
    alignItems: 'center',
    backgroundColor: 'transparent'
  }
});

module.exports = Carousel;