[Feature] Folder are now visible on top files, created a small tree and added the lessons below

Author: md-weber

lib/domain/files_service.dart

@@ -5,11 +5,33 @@ import 'package:googleapis/drive/v2.dart';
 class FileService {
   final GDriveRepo _sheetRepo = GDriveRepo();
 
-  Future<List<FileInformation>> getPossibleLectures() async {
-    List<File> files = await _sheetRepo.getFiles();
+  Future<List<LectureFolder>> getPossibleLectures() async {
+    List<File> filesAndFolders = await _sheetRepo.getFilesAndFolders();
 
-    return files
-        .map((file) => FileInformation(file.title ?? "", file.id ?? ""))
+    final spreadsheets = filesAndFolders
+        .where((element) => element.mimeType?.contains("spreadsheet") ?? false)
         .toList();
+
+    final folders = filesAndFolders
+        .where((element) => element.mimeType?.contains("folder") ?? false)
+        .where((element) => element.title != "Flashcard App")
+        .toList();
+
+    List<LectureFolder> t =
+        folders.map((folder) => LectureFolder(folder.title ?? "", [])).toList();
+
+    for (var spreadsheet in spreadsheets) {
+      final folder = folders.firstWhere(
+        (element) => element.id == spreadsheet.parents?[0].id,
+      );
+      final lectureFolder =
+          t.firstWhere((element) => element.name == folder.title);
+
+      lectureFolder.spreadsheets.add(
+        LectureInformation(spreadsheet.title ?? "", spreadsheet.id ?? ""),
+      );
+    }
+
+    return t;
   }
 }

lib/domain/model/file_information.dart

@@ -1,6 +1,13 @@
-class FileInformation {
+class LectureInformation {
   final String name;
   final String id;
 
-  FileInformation(this.name, this.id);
+  LectureInformation(this.name, this.id);
+}
+
+class LectureFolder {
+  final String name;
+  final List<LectureInformation> spreadsheets;
+
+  LectureFolder(this.name, this.spreadsheets);
 }

lib/repository/gdrive_repo.dart

@@ -10,14 +10,12 @@ class GDriveRepo {
     init = initSheetRepo();
   }
 
-  Future<List<File>> getFiles() async {
+  Future<List<File>> getFilesAndFolders() async {
     await init;
     final result = await driveApi.files.list();
     var files = result.items;
     if (files == null) throw UnsupportedError("No files found");
-    return files
-        .where((element) => element.mimeType?.contains("spreadsheet") ?? false)
-        .toList();
+    return files;
   }
 
   Future<void> initSheetRepo() async {

lib/ui/screen/lesson_selector_screen.dart

@@ -12,7 +12,7 @@ class LessonSelectorScreen extends StatefulWidget {
 
 class _LessonSelectorScreenState extends State<LessonSelectorScreen> {
   FileService fileService = FileService();
-  late Future<List<FileInformation>> getPossibleLectures;
+  late Future<List<LectureFolder>> getPossibleLectures;
 
   @override
   void initState() {
@@ -26,26 +26,34 @@ class _LessonSelectorScreenState extends State<LessonSelectorScreen> {
       appBar: AppBar(
         title: const Text("Select your lesson"),
       ),
-      body: FutureBuilder<List<FileInformation>>(
+      body: FutureBuilder<List<LectureFolder>>(
           future: getPossibleLectures,
           builder: (context, snapshot) {
             if (snapshot.hasData) {
-              final possibleLecture = snapshot.data;
-              if (possibleLecture == null) return Container();
-              return ListView.separated(
-                itemBuilder: (context, index) {
-                  return ListTile(
-                    title: Text(possibleLecture[index].name),
-                    trailing: const Icon(Icons.keyboard_arrow_right),
-                    onTap: () {
-                      HomePage.navigateTo(context, possibleLecture[index].id);
-                    },
-                  );
-                },
-                separatorBuilder: (context, index) {
-                  return const Divider();
-                },
-                itemCount: possibleLecture.length,
+              final possibleLectureFolders = snapshot.data;
+              if (possibleLectureFolders == null) return Container();
+              return CustomScrollView(
+                slivers: [
+                  for (var lectureFolder in possibleLectureFolders) ...[
+                    SliverAppBar(
+                      title: Text(lectureFolder.name),
+                    ),
+                    SliverList(
+                      delegate: SliverChildBuilderDelegate((context, index) {
+                        return ListTile(
+                          title: Text(lectureFolder.spreadsheets[index].name),
+                          trailing: const Icon(Icons.keyboard_arrow_right),
+                          onTap: () {
+                            HomePage.navigateTo(
+                              context,
+                              lectureFolder.spreadsheets[index].id,
+                            );
+                          },
+                        );
+                      }, childCount: lectureFolder.spreadsheets.length),
+                    )
+                  ]
+                ],
               );
             }
             if (snapshot.hasError) return const Text("Something wrong happend");