Lib view mode (#2975)

* [update dir layout]rewrite dir layout

* add file menu handler

* optimized code

* add file load error message for file component

* repair pencil bug

* delete unnecessary file

* reapir file-chooser bug

* add file uploader module

* rename component name

frontend/src/components/dir-view-mode/dir-grid-view.js

@@ -0,0 +1,19 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+const propTypes = {
+
+};
+
+class DirGridView extends React.Component {
+
+  render() {
+    return (
+      <div>表格布局</div>
+    );
+  }
+}
+
+DirGridView.propTypes = propTypes;
+
+export default DirGridView;