io utils; single favorite folder exporting and importing

lib/pages/comic_page.dart

@@ -1145,7 +1145,7 @@ class _FavoritePanelState extends State<_FavoritePanel> {
         title: Text("Favorite".tl),
       ),
       body: DefaultTabController(
-        length: comicSource.favoriteData == null ? 1 : 2,
+        length: hasNetwork ? 2 : 1,
         child: Column(
           children: [
             TabBar(tabs: [

lib/pages/comic_source_page.dart

@@ -1,7 +1,4 @@
 import 'dart:convert';
-import 'dart:io';
-
-import 'package:file_picker/file_picker.dart';
 import 'package:flutter/material.dart';
 import 'package:url_launcher/url_launcher_string.dart';
 import 'package:venera/components/components.dart';
@@ -11,6 +8,7 @@ import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/log.dart';
 import 'package:venera/network/app_dio.dart';
 import 'package:venera/utils/ext.dart';
+import 'package:venera/utils/io.dart';
 import 'package:venera/utils/translations.dart';
 
 class ComicSourcePage extends StatefulWidget {
@@ -328,7 +326,7 @@ class _BodyState extends State<_Body> {
               Row(
                 children: [
                   TextButton(
-                          onPressed: selectFile, child: Text("Select file".tl))
+                          onPressed: _selectFile, child: Text("Select file".tl))
                       .paddingLeft(8),
                   const Spacer(),
                   TextButton(
@@ -350,16 +348,12 @@ class _BodyState extends State<_Body> {
     );
   }
 
-  void selectFile() async {
-    final result = await FilePicker.platform.pickFiles(
-      type: FileType.custom,
-      allowedExtensions: ['js'],
-    );
-    final file = result?.files.first;
+  void _selectFile() async {
+    final file = await selectFile(ext: ["js"]);
     if (file == null) return;
     try {
       var fileName = file.name;
-      var bytes = await File(file.path!).readAsBytes();
+      var bytes = await file.readAsBytes();
       var content = utf8.decode(bytes);
       await addSource(content, fileName);
     } catch (e, s) {

lib/pages/favorites/favorite_actions.dart

@@ -27,10 +27,26 @@ Future<void> newFolder() async {
                       });
                     }
                   },
-                )
+                ),
               ],
             ).paddingHorizontal(16),
             actions: [
+              TextButton(
+                child: Text("Import from file".tl),
+                onPressed: () async {
+                  var file = await selectFile(ext: ['json']);
+                  if(file == null) return;
+                  var data = await file.readAsBytes();
+                  try {
+                    LocalFavoritesManager().fromJson(utf8.decode(data));
+                  }
+                  catch(e) {
+                    context.showMessage(message: "Failed to import".tl);
+                    return;
+                  }
+                  context.pop();
+                },
+              ).paddingRight(4),
               FilledButton(
                 onPressed: () {
                   var e = validateFolderName(controller.text);

lib/pages/favorites/favorites_page.dart

@@ -1,3 +1,4 @@
+import 'dart:convert';
 import 'dart:math';
 
 import 'package:flutter/material.dart';
@@ -9,6 +10,7 @@ import 'package:venera/foundation/comic_source/comic_source.dart';
 import 'package:venera/foundation/comic_type.dart';
 import 'package:venera/foundation/favorites.dart';
 import 'package:venera/foundation/res.dart';
+import 'package:venera/utils/io.dart';
 import 'package:venera/utils/translations.dart';
 
 part 'favorite_actions.dart';
@@ -134,7 +136,12 @@ class _FavoritesPageState extends State<FavoritesPage>  {
                     )
                   : null,
             ),
-            title: Text("Unselected".tl),
+            title: GestureDetector(
+              onTap: context.width < _kTwoPanelChangeWidth
+                  ? showFolderSelector
+                  : null,
+              child: Text("Unselected".tl),
+            ),
           ),
         ],
       );

lib/pages/favorites/local_favorites_page.dart

@@ -15,8 +15,10 @@ class _LocalFavoritesPageState extends State<_LocalFavoritesPage> {
   late List<FavoriteItem> comics;
 
   void updateComics() {
+    print(comics.length);
     setState(() {
       comics = LocalFavoritesManager().getAllComics(widget.folder);
+      print(comics.length);
     });
   }
 
@@ -64,7 +66,6 @@ class _LocalFavoritesPageState extends State<_LocalFavoritesPage> {
                           favPage.setFolder(false, null);
                           LocalFavoritesManager().deleteFolder(widget.folder);
                           favPage.folderList?.updateFolders();
-                          context.pop();
                         },
                       );
                     }),
@@ -110,6 +111,18 @@ class _LocalFavoritesPageState extends State<_LocalFavoritesPage> {
                         },
                       );
                     }),
+                MenuEntry(
+                    icon: Icons.upload_file,
+                    text: "Export".tl,
+                    onClick: () {
+                      var json = LocalFavoritesManager().folderToJson(
+                        widget.folder,
+                      );
+                      saveFile(
+                        data: utf8.encode(json),
+                        filename: "${widget.folder}.json",
+                      );
+                    }),
               ],
             ),
           ],

lib/pages/favorites/side_bar.dart

@@ -211,11 +211,13 @@ class _LeftBarState extends State<_LeftBar> implements FolderList {
 
   @override
   void update() {
+    if(!mounted) return;
     setState(() {});
   }
 
   @override
   void updateFolders() {
+    if(!mounted) return;
     setState(() {
       folders = LocalFavoritesManager().folderNames;
       networkFolders = ComicSource.all()

lib/pages/settings/app.dart

@@ -25,8 +25,11 @@ class _AppSettingsState extends State<AppSettings> {
           title: "Set New Storage Path".tl,
           actionTitle: "Set".tl,
           callback: () async {
-            var picker = FilePicker.platform;
-            var result = await picker.getDirectoryPath();
+            if(App.isIOS) {
+              context.showMessage(message: "Not supported on iOS".tl);
+              return;
+            }
+            var result = await selectDirectory();
             if (result == null) return;
             var loadingDialog = showLoadingDialog(
               App.rootContext,

lib/pages/settings/settings_page.dart

@@ -1,6 +1,4 @@
 import 'dart:convert';
-
-import 'package:file_picker/file_picker.dart';
 import 'package:flutter/foundation.dart';
 import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';