Renames

frontend/components/PreviewLoading/PreviewLoading.js

@@ -0,0 +1,46 @@
+// @flow
+import React from 'react';
+import ReactCSSTransitionGroup from 'react-addons-css-transition-group';
+import styled, { keyframes } from 'styled-components';
+import { Flex } from 'reflexbox';
+
+import { randomInteger } from 'utils/random';
+
+const randomValues = Array.from(
+  new Array(5),
+  () => `${randomInteger(85, 100)}%`
+);
+
+export default () => {
+  return (
+    <ReactCSSTransitionGroup
+      transitionName="fadeIn"
+      transitionAppear
+      transitionEnter
+      transitionLeave
+      transitionAppearTimeout={0}
+      transitionEnterTimeout={0}
+      transitionLeaveTimeout={0}
+    >
+      <Flex column auto>
+        <Mask style={{ width: randomValues[0] }} header />
+        <Mask style={{ width: randomValues[1] }} />
+        <Mask style={{ width: randomValues[2] }} />
+        <Mask style={{ width: randomValues[3] }} />
+      </Flex>
+    </ReactCSSTransitionGroup>
+  );
+};
+
+const pulsate = keyframes`
+  0%   { opacity: 1; }
+  50% { opacity: 0.5; }
+  100% { opacity: 1; }
+`;
+
+const Mask = styled(Flex)`
+  height: ${props => (props.header ? 28 : 18)}px;
+  margin-bottom: ${props => (props.header ? 32 : 14)}px;
+  background-color: #ddd;
+  animation: ${pulsate} 1.3s infinite;
+`;