scrollToItem = () => {
    const MARGIN = 4;
    let i = this.state.contentOffset.y / (c.PLACE_HEIGHT + MARGIN);

    if (this.state.scrollDirection === 'down') {
       i = Math.ceil(i) // 1.1 2
    } else {
       i = Math.floor(i); // 1.1 1
    }

    i !== -1 && i < this.props.places.length && this.props.scrollToPlace(i, true)
};

<FlatList
    data={places}
    enderItem={this.renderPlace}
    keyExtractor={({place_id}) => place_id}
    onScroll={this.onScroll}
    scrollEventThrottle={30}
    onViewableItemsChanged={this.onViewableItemsChanged}
    viewabilityConfig={{itemVisiblePercentThreshold: 0}}
    getItemLayout={this.getItemLayout}
    scrollEnabled={scrollEnabled || !this.state.isFingerPress}
    style={{height: scrollBarHeight}}
    onScrollEndDrag={ () => {}}
    {...this._panResponder.panHandlers}
  />