in deprecated-react-native-listview/index.js [584:593]
_onLayout: function(event: Object) {
const {width, height} = event.nativeEvent.layout;
const visibleLength = !this.props.horizontal ? height : width;
if (visibleLength !== this.scrollProperties.visibleLength) {
this.scrollProperties.visibleLength = visibleLength;
this._updateVisibleRows();
this._renderMoreRowsIfNeeded();
}
this.props.onLayout && this.props.onLayout(event);
},