All files / src BeatLoader.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 { sizeMarginKeys, sizeMarginDefaults } from "./helpers";
import { LoaderSizeMarginProps, PrecompiledCss, StyleFunctionWithIndex } from "./interfaces";
 
const beat: Keyframes = keyframes`
  50% {transform: scale(0.75);opacity: 0.2}
  100% {transform: scale(1);opacity: 1}
`;
 
class Loader extends React.PureComponent<LoaderSizeMarginProps> {
  public static defaultProps: LoaderSizeMarginProps = sizeMarginDefaults(15);
  public style: StyleFunctionWithIndex = (i: number): PrecompiledCss => {
    const { color, size, sizeUnit, margin } = this.props;
 
    return css`
      display: inline-block;
      background-color: ${color};
      width: ${`${size}${sizeUnit}`};
      height: ${`${size}${sizeUnit}`};
      margin: ${margin};
      border-radius: 100%;
      animation: ${beat} 0.7s ${i % 2 ? "0s" : "0.35s"} infinite linear;
      animation-fill-mode: both;
    `;
  };
 
  public render(): JSX.Element | null {
    const { loading, css } = this.props;
 
    return loading ? (
      <div css={[css]}>
        <div css={this.style(1)} />
        <div css={this.style(2)} />
        <div css={this.style(3)} />
      </div>
    ) : null;
  }
}
 
const Component: React.ComponentClass<LoaderSizeMarginProps> = onlyUpdateForKeys(sizeMarginKeys)(
  Loader
);
Component.defaultProps = Loader.defaultProps;
export default Component;