All files / src PropagateLoader.tsx

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/** @jsx jsx */
import * as React from "react";
import { keyframes, css, jsx } from "@emotion/core";
import { Keyframes } from "@emotion/serialize";
import onlyUpdateForKeys from "recompose/onlyUpdateForKeys";
 
import { sizeDefaults, sizeKeys } from "./helpers";
import {
  StyleFunction,
  PrecompiledCss,
  LoaderSizeProps,
  StyleFunctionWithIndex
} from "./interfaces";
 
// 1.5 4.5 7.5
let distance: number[] = [1, 3, 5];
 
const propagate: Keyframes[] = [
  keyframes`
      25% {transform: translateX(-${distance[0]}rem) scale(0.75)}
      50% {transform: translateX(-${distance[1]}rem) scale(0.6)}
      75% {transform: translateX(-${distance[2]}rem) scale(0.5)}
      95% {transform: translateX(0rem) scale(1)}
    `,
  keyframes`
      25% {transform: translateX(-${distance[0]}rem) scale(0.75)}
      50% {transform: translateX(-${distance[1]}rem) scale(0.6)}
      75% {transform: translateX(-${distance[1]}rem) scale(0.6)}
      95% {transform: translateX(0rem) scale(1)}
    `,
  keyframes`
      25% {transform: translateX(-${distance[0]}rem) scale(0.75)}
      75% {transform: translateX(-${distance[0]}rem) scale(0.75)}
      95% {transform: translateX(0rem) scale(1)}
    `,
  keyframes`
      25% {transform: translateX(${distance[0]}rem) scale(0.75)}
      75% {transform: translateX(${distance[0]}rem) scale(0.75)}
      95% {transform: translateX(0rem) scale(1)}
    `,
  keyframes`
      25% {transform: translateX(${distance[0]}rem) scale(0.75)}
      50% {transform: translateX(${distance[1]}rem) scale(0.6)}
      75% {transform: translateX(${distance[1]}rem) scale(0.6)}
      95% {transform: translateX(0rem) scale(1)}
    `,
  keyframes`
      25% {transform: translateX(${distance[0]}rem) scale(0.75)}
      50% {transform: translateX(${distance[1]}rem) scale(0.6)}
      75% {transform: translateX(${distance[2]}rem) scale(0.5)}
      95% {transform: translateX(0rem) scale(1)}
    `
];
 
class Loader extends React.PureComponent<LoaderSizeProps> {
  public static defaultProps: LoaderSizeProps = sizeDefaults(15);
 
  public style: StyleFunctionWithIndex = (i: number): PrecompiledCss => {
    const { size, sizeUnit, color } = this.props;
 
    return css`
      position: absolute;
      font-size: ${`${size! / 3}${sizeUnit}`};
      width: ${`${size}${sizeUnit}`};
      height: ${`${size}${sizeUnit}`};
      background: ${color};
      border-radius: 50%;
      animation: ${propagate[i]} 1.5s infinite;
      animation-fill-mode: forwards;
    `;
  };
 
  public wrapper: StyleFunction = (): PrecompiledCss => {
    return css`
      position: relative;
    `;
  };
 
  public render(): JSX.Element | null {
    const { loading, css } = this.props;
 
    return loading ? (
      <div css={[this.wrapper(), css]}>
        <div css={this.style(0)} />
        <div css={this.style(1)} />
        <div css={this.style(2)} />
        <div css={this.style(3)} />
        <div css={this.style(4)} />
        <div css={this.style(5)} />
      </div>
    ) : null;
  }
}
 
const Component: React.ComponentClass<LoaderSizeProps> = onlyUpdateForKeys(sizeKeys)(Loader);
Component.defaultProps = Loader.defaultProps;
export default Component;