Implement refresh on drag down

lib/home_page.dart

@@ -93,6 +93,12 @@ class _MyHomePageState extends State<MyHomePage> with FullScreenListener {
     return sheets;
   }
 
+  Future<void> _refreshSheets() async {
+    setState(() {
+      sheets = acquireSheets();
+    });
+  }
+
   Future<void> _logOut() async {
     // Delete saved jwt
     await _storageHelper.writeSecure(SecureStorageKey.jwt, null);
@@ -189,14 +195,17 @@ class _MyHomePageState extends State<MyHomePage> with FullScreenListener {
       // Icon for drawer appears automatically
       appBar: AppBar(title: const Text("Sheetless")),
       endDrawer: _buildDrawer(),
-      body: FutureBuilder(
+      body: RefreshIndicator(
+        onRefresh: _refreshSheets,
+        child: FutureBuilder(
           future: sheets,
           builder: (BuildContext context, AsyncSnapshot<List<Sheet>> snapshot) {
             if (snapshot.hasData) {
               return SheetsWidget(
                 sheets: snapshot.data!,
                 onSheetOpenRequest: (sheet) {
-                _storageHelper.writeSheetAccessTime(sheet.uuid, DateTime.now());
+                  _storageHelper.writeSheetAccessTime(
+                      sheet.uuid, DateTime.now());
                   Navigator.push(
                     context,
                     MaterialPageRoute(
@@ -225,6 +234,7 @@ class _MyHomePageState extends State<MyHomePage> with FullScreenListener {
             }
           },
         ),
+      ),
     );
   }
 }