react-native-animated-pagination-dot/lib/module/component/Dot.js

test

/**
 *
 * Created by rouge on 11/09/2019.
 * Converted to Typescript on 14/07/2020.
 * Converted to Functional component. on 21/09/2021
 */
import React, { useEffect, useMemo, useState } from 'react';
import { Animated } from 'react-native';
import usePrevious from 'react-use/lib/usePrevious';
import EmptyDot from './EmptyDot';
import { getDotStyle } from '../util/DotUtils';

const Dot = props => {
  const [animVal] = useState(new Animated.Value(0));
  const [animate, setAnimate] = useState(false);
  const [type, setType] = useState(() => getDotStyle({
    idx: props.idx,
    curPage: props.curPage,
    maxPage: props.maxPage
  }));
  const [dotColor, setDotColor] = useState(() => {
    var _props$inactiveColor;

    if (props.curPage === props.idx) {
      //its current active page now
      return props.activeColor;
    }

    return (_props$inactiveColor = props.inactiveColor) !== null && _props$inactiveColor !== void 0 ? _props$inactiveColor : props.activeColor;
  });
  const prevType = usePrevious(type);
  const prevDotColor = usePrevious(dotColor);
  useEffect(() => {
    const nextType = getDotStyle({
      idx: props.idx,
      curPage: props.curPage,
      maxPage: props.maxPage
    });
    const nextAnimate = nextType.size !== ((prevType === null || prevType === void 0 ? void 0 : prevType.size) || 3) || nextType.opacity !== ((prevType === null || prevType === void 0 ? void 0 : prevType.opacity) || 0.2);

    if (props.curPage === props.idx) {
      setDotColor(props.activeColor);
    } else {
      var _props$inactiveColor2;

      setDotColor((_props$inactiveColor2 = props.inactiveColor) !== null && _props$inactiveColor2 !== void 0 ? _props$inactiveColor2 : props.activeColor);
    }

    setType(nextType);
    setAnimate(nextAnimate);
  }, [prevType === null || prevType === void 0 ? void 0 : prevType.opacity, prevType === null || prevType === void 0 ? void 0 : prevType.size, props.activeColor, props.curPage, props.idx, props.inactiveColor, props.maxPage]);
  useEffect(() => {
    if (!animate) return;
    animVal.setValue(0);
    Animated.timing(animVal, {
      toValue: 1,
      duration: 300,
      useNativeDriver: false
    }).start();
  }, [animVal, animate, prevType, type]);
  const animStyle = useMemo(() => {
    const size = animVal.interpolate({
      inputRange: [0, 1],
      outputRange: [((prevType === null || prevType === void 0 ? void 0 : prevType.size) || 3) * props.sizeRatio, type.size * props.sizeRatio]
    });
    const backgroundColor = animVal.interpolate({
      inputRange: [0, 1],
      outputRange: [prevDotColor !== null && prevDotColor !== void 0 ? prevDotColor : props.activeColor, dotColor]
    });
    return {
      width: size,
      height: size,
      backgroundColor,
      borderRadius: animVal.interpolate({
        inputRange: [0, 1],
        outputRange: [((prevType === null || prevType === void 0 ? void 0 : prevType.size) || 3) * props.sizeRatio * 0.5, type.size * props.sizeRatio * 0.5]
      }),
      opacity: animVal.interpolate({
        inputRange: [0, 1],
        outputRange: [(prevType === null || prevType === void 0 ? void 0 : prevType.opacity) || 0.2, type.opacity]
      })
    };
  }, [animVal, dotColor, prevDotColor, prevType === null || prevType === void 0 ? void 0 : prevType.opacity, prevType === null || prevType === void 0 ? void 0 : prevType.size, props.activeColor, props.sizeRatio, type.opacity, type.size]);

  if (props.curPage < 3) {
    if (props.idx >= 5) return /*#__PURE__*/React.createElement(EmptyDot, {
      sizeRatio: props.sizeRatio
    });
  } else if (props.curPage < 4) {
    if (props.idx > 5) return /*#__PURE__*/React.createElement(EmptyDot, {
      sizeRatio: props.sizeRatio
    });
  }

  return /*#__PURE__*/React.createElement(Animated.View, {
    style: [{
      margin: 3 * props.sizeRatio
    }, animStyle]
  });
};

export default Dot;
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