react-native-reanimated/lib/module/reanimated2/component/FlatList.js

More powerful alternative to Animated library for React Native.

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, { Component, forwardRef } from 'react';
import { FlatList, StyleSheet } from 'react-native';
import { AnimatedView } from './View';
import createAnimatedComponent from '../../createAnimatedComponent/createAnimatedComponent';
const AnimatedFlatList = createAnimatedComponent(FlatList);
const createCellRenderer = (itemLayoutAnimation, cellStyle) => {
  const cellRenderer = props => {
    return /*#__PURE__*/React.createElement(AnimatedView
    // TODO TYPESCRIPT This is temporary cast is to get rid of .d.ts file.
    , {
      layout: itemLayoutAnimation,
      onLayout: props.onLayout,
      style: cellStyle
    }, props.children);
  };
  return cellRenderer;
};

// TODO TYPESCRIPT This is a temporary type to get rid of .d.ts file.

export const ReanimatedFlatList = /*#__PURE__*/forwardRef((props, ref) => {
  const {
    itemLayoutAnimation,
    ...restProps
  } = props;
  const cellStyle = restProps !== null && restProps !== void 0 && restProps.inverted ? restProps !== null && restProps !== void 0 && restProps.horizontal ? styles.horizontallyInverted : styles.verticallyInverted : undefined;

  // Set default scrollEventThrottle, because user expects
  // to have continuous scroll events and
  // react-native defaults it to 50 for FlatLists.
  // We set it to 1 so we have peace until
  // there are 960 fps screens.
  if (!('scrollEventThrottle' in restProps)) {
    restProps.scrollEventThrottle = 1;
  }
  const cellRenderer = React.useMemo(() => createCellRenderer(itemLayoutAnimation, cellStyle), [cellStyle]);
  return /*#__PURE__*/React.createElement(AnimatedFlatList, _extends({
    ref: ref
  }, restProps, {
    CellRendererComponent: cellRenderer
  }));
});
const styles = StyleSheet.create({
  verticallyInverted: {
    transform: [{
      scaleY: -1
    }]
  },
  horizontallyInverted: {
    transform: [{
      scaleX: -1
    }]
  }
});
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