ComposerUploadForm → UploadForm + UploadFormContainer

app/javascript/flavours/glitch/features/compose/components/upload_progress.js

@@ -0,0 +1,42 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import Motion from 'flavours/glitch/util/optional_motion';
+import spring from 'react-motion/lib/spring';
+import { FormattedMessage } from 'react-intl';
+import Icon from 'flavours/glitch/components/icon';
+
+export default class UploadProgress extends React.PureComponent {
+
+  static propTypes = {
+    active: PropTypes.bool,
+    progress: PropTypes.number,
+  };
+
+  render () {
+    const { active, progress } = this.props;
+
+    if (!active) {
+      return null;
+    }
+
+    return (
+      <div className='composer--upload_form--progress'>
+        <Icon icon='upload' />
+
+        <div className='message'>
+          <FormattedMessage id='upload_progress.label' defaultMessage='Uploading...' />
+
+          <div className='backdrop'>
+            <Motion defaultStyle={{ width: 0 }} style={{ width: spring(progress) }}>
+              {({ width }) =>
+                (<div className='tracker' style={{ width: `${width}%` }}
+                />)
+              }
+            </Motion>
+          </div>
+        </div>
+      </div>
+    );
+  }
+
+}