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app/javascript/gabsocial/components/floating_action_button.js

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+import Icon from './icon'
+import Button from './button'
+
+export default class FloatingActionButton extends Component {
+  static propTypes = {
+    onClick: PropTypes.func.isRequired,
+    message: PropTypes.string.isRequired,
+  };
+
+  shouldComponentUpdate(nextProps) {
+    return nextProps.message !== this.props.message;
+  }
+
+  render() {
+    const { onClick, message } = this.props;
+
+    return (
+      <Button onClick={onClick} className='floating-action-button' aria-label={message}>
+        <Icon id='compose' />
+      </Button>
+    )
+  }
+}