@kirz/react-native-toolkit/lib/module/components/SnapCarousel.js

Toolkit to speed up React Native development

function _extends() { _extends = Object.assign ? Object.assign.bind() : function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
import React, { useCallback, useRef, useState } from 'react';
import { FlatList, Platform } from 'react-native';
import { View } from './View';
import { scaleX } from '../utils/scale';
export function SnapCarousel(_ref) {
  let {
    items,
    renderItem: originalRenderItem,
    spacing = scaleX(14),
    ...props
  } = _ref;
  const [snapToOffsets, setSnapToOffsets] = useState([]);
  const snapToOffsetsRef = useRef([]);
  const handleItemLayout = useCallback((e, index) => {
    const itemWidth = e.nativeEvent.layout.width;
    snapToOffsetsRef.current[index] = itemWidth;
    if (snapToOffsetsRef.current.filter(x => !!x).length === items.length) {
      setSnapToOffsets(snapToOffsetsRef.current.reduce((acc, x, index) => {
        if (index === 0) {
          return [x + spacing];
        }
        return [...acc, acc[index - 1] + x + spacing];
      }, []));
    }
  }, [spacing, items.length]);
  const renderItem = useCallback(_ref2 => {
    let {
      index,
      item,
      separators
    } = _ref2;
    return /*#__PURE__*/React.createElement(View, _extends({
      style: {
        marginRight: index !== items.length - 1 ? spacing : 0
      }
    }, snapToOffsets.length !== items.length ? {
      onLayout: e => handleItemLayout(e, index)
    } : {}), originalRenderItem({
      index,
      item,
      separators
    }));
  }, [handleItemLayout, originalRenderItem, items.length, snapToOffsets.length]);
  return /*#__PURE__*/React.createElement(FlatList, _extends({}, props, {
    renderItem: renderItem,
    horizontal: true,
    data: items,
    showsHorizontalScrollIndicator: false,
    snapToOffsets: snapToOffsets,
    snapToAlignment: props.snapToAlignment ?? 'start',
    decelerationRate: props.decelerationRate ?? (Platform.OS === 'ios' ? 0.992 : 0.985),
    keyboardShouldPersistTaps: "always",
    keyExtractor: props.keyExtractor ?? ((item, idx) => ((item === null || item === void 0 ? void 0 : item.id) ?? idx).toString())
  }));
}
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