@td-design/react-native/lib/module/indicator/UIActivityIndicator.js

react-native UI组件库

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, { PureComponent } from 'react';
import { Animated, StyleSheet } from 'react-native';
import Box from '../box';
import Indicator from './Indicator';
export default class UIActivityIndicator extends PureComponent {
  static displayName = 'UIActivityIndicator';
  static defaultProps = {
    color: 'rgb(0, 0, 0)',
    count: 12,
    size: 36
  };
  renderComponent = _ref => {
    let {
      index,
      count,
      progress
    } = _ref;
    const {
      size,
      color: backgroundColor
    } = this.props;
    const angle = index * 360 / count;
    const layerStyle = {
      transform: [{
        rotate: angle + 'deg'
      }]
    };
    const inputRange = Array.from(new Array(count + 1), (_, index) => index / count);
    const outputRange = Array.from(new Array(count), (_, index) => Math.max(1.0 - index * (1 / (count - 1)), 0));
    for (let j = 0; j < index; j++) {
      outputRange.unshift(outputRange.pop());
    }
    outputRange.unshift(...outputRange.slice(-1));
    const barStyle = {
      width: size / 10,
      height: size / 4,
      borderRadius: size / 20,
      backgroundColor,
      opacity: progress.interpolate({
        inputRange,
        outputRange
      })
    };
    return /*#__PURE__*/React.createElement(Animated.View, {
      style: [styles.layer, layerStyle],
      key: index
    }, /*#__PURE__*/React.createElement(Animated.View, {
      style: barStyle
    }));
  };
  render() {
    const {
      style,
      size: width,
      size: height,
      ...props
    } = this.props;
    return /*#__PURE__*/React.createElement(Box, {
      style: style
    }, /*#__PURE__*/React.createElement(Indicator, _extends({
      style: {
        width,
        height
      },
      renderComponent: this.renderComponent
    }, props)));
  }
}
const styles = StyleSheet.create({
  layer: {
    ...StyleSheet.absoluteFillObject,
    justifyContent: 'flex-start',
    alignItems: 'center'
  }
});
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