Allow backlinks preview to be disabled from the settings

This adds a new Experimental Settings page.

assets/langs/en.yaml

@@ -47,6 +47,10 @@ settings:
       title: Example Title
   privacy: Privacy Policy
   terms: Terms and Conditions
+  experimental:
+    title: Experimental Features
+    subtitle: Try out features in Development
+    backlinks: Show Backlinks in Markdown Preview
 
 editors:
   checklist:

lib/screens/settings_experimental.dart

@@ -0,0 +1,45 @@
+import 'package:flutter/material.dart';
+import 'package:easy_localization/easy_localization.dart';
+import 'package:gitjournal/settings.dart';
+
+class ExperimentalSettingsScreen extends StatefulWidget {
+  @override
+  _ExperimentalSettingsScreenState createState() =>
+      _ExperimentalSettingsScreenState();
+}
+
+class _ExperimentalSettingsScreenState
+    extends State<ExperimentalSettingsScreen> {
+  @override
+  Widget build(BuildContext context) {
+    var settings = Settings.instance;
+
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(tr('settings.experimental.title')),
+        leading: IconButton(
+          icon: const Icon(Icons.arrow_back),
+          onPressed: () {
+            Navigator.of(context).pop();
+          },
+        ),
+      ),
+      body: Scrollbar(
+        child: ListView(
+          children: <Widget>[
+            SwitchListTile(
+              title: Text(tr('settings.experimental.backlinks')),
+              value: settings.experimentalBacklinks,
+              onChanged: (bool newVal) {
+                settings.experimentalBacklinks = newVal;
+                settings.save();
+                setState(() {});
+              },
+            ),
+          ],
+          padding: const EdgeInsets.fromLTRB(0.0, 16.0, 0.0, 0.0),
+        ),
+      ),
+    );
+  }
+}

lib/screens/settings_screen.dart

@@ -4,6 +4,7 @@ import 'package:easy_localization/easy_localization.dart';
 import 'package:gitjournal/core/notes_folder_fs.dart';
 import 'package:gitjournal/screens/debug_screen.dart';
 import 'package:gitjournal/screens/settings_editors.dart';
+import 'package:gitjournal/screens/settings_experimental.dart';
 import 'package:gitjournal/screens/settings_images.dart';
 import 'package:gitjournal/settings.dart';
 import 'package:gitjournal/state_container.dart';
@@ -270,6 +271,17 @@ class SettingsListState extends State<SettingsList> {
           Navigator.of(context).push(route);
         },
       ),
+      ListTile(
+        title: Text(tr('settings.experimental.title')),
+        subtitle: Text(tr('settings.experimental.subtitle')),
+        onTap: () {
+          var route = MaterialPageRoute(
+            builder: (context) => ExperimentalSettingsScreen(),
+            settings: const RouteSettings(name: '/settings/experimental'),
+          );
+          Navigator.of(context).push(route);
+        },
+      ),
       ListTile(
         title: Text(tr('settings.privacy')),
         onTap: () {

lib/settings.dart

@@ -49,6 +49,8 @@ class Settings {
   String imageLocationSpec = "."; // . means the same folder
   String debugLogLevel = 'v';
 
+  bool experimentalBacklinks = true;
+
   void load(SharedPreferences pref) {
     gitAuthor = pref.getString("gitAuthor") ?? gitAuthor;
     gitAuthorEmail = pref.getString("gitAuthorEmail") ?? gitAuthorEmail;
@@ -102,6 +104,8 @@ class Settings {
         pref.getString("imageLocationSpec") ?? imageLocationSpec;
 
     debugLogLevel = pref.getString("debugLogLevel") ?? debugLogLevel;
+    experimentalBacklinks =
+        pref.getBool("experimentalBacklinks") ?? experimentalBacklinks;
   }
 
   Future save() async {
@@ -159,6 +163,8 @@ class Settings {
     _setString(pref, "imageLocationSpec", imageLocationSpec,
         defaultSet.imageLocationSpec);
     _setString(pref, "debugLogLevel", debugLogLevel, defaultSet.debugLogLevel);
+    _setBool(pref, "experimentalBacklinks", experimentalBacklinks,
+        defaultSet.experimentalBacklinks);
 
     pref.setInt("settingsVersion", version);
 
@@ -219,6 +225,7 @@ class Settings {
       'homeScreen': homeScreen.toInternalString(),
       'imageLocationSpec': imageLocationSpec,
       'debugLogLevel': debugLogLevel,
+      'experimentalBacklinks': experimentalBacklinks.toString(),
     };
   }
 

lib/widgets/note_viewer.dart

@@ -5,6 +5,7 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_markdown/flutter_markdown.dart';
 import 'package:gitjournal/folder_views/common.dart';
+import 'package:gitjournal/settings.dart';
 import 'package:gitjournal/utils.dart';
 import 'package:gitjournal/utils/logger.dart';
 import 'package:gitjournal/widgets/editor_scroll_view.dart';
@@ -79,7 +80,8 @@ class NoteViewer extends StatelessWidget {
             ),
           ),
           const SizedBox(height: 16.0),
-          NoteBacklinkRenderer(note: note, rootFolder: rootFolder),
+          if (Settings.instance.experimentalBacklinks)
+            NoteBacklinkRenderer(note: note, rootFolder: rootFolder),
           // _buildFooter(context),
         ],
         crossAxisAlignment: CrossAxisAlignment.start,