@react-native-mapbox-gl/maps/javascript/utils/animated/AnimatedExtractCoordinateFromArray.js

A Mapbox GL react native module for creating custom maps

import {Animated} from 'react-native';

// see
// https://github.com/facebook/react-native/blob/master/Libraries/Animated/src/nodes/AnimatedWithChildren.js
const AnimatedWithChildren = Object.getPrototypeOf(Animated.ValueXY);
if (__DEV__) {
  if (AnimatedWithChildren.name !== 'AnimatedWithChildren') {
    console.error(
      'AnimatedCoordinatesArray could not obtain AnimatedWithChildren base class',
    );
  }
}

export default class AnimatedExtractCoordinateFromArray extends AnimatedWithChildren {
  _array = null;

  _index = 0;

  constructor(array, index) {
    super();
    this._array = array;
    this._index = index;
  }

  __getValue() {
    const actArray = this._array.__getValue();
    let index = this._index;

    if (index < 0) {
      index += actArray.length;
    }
    return actArray[index];
  }

  __attach() {
    this._array.__addChild(this);
  }

  __detach() {
    this._array.__removeChild(this);
    super.__detach();
  }
}