Implement signing feature (#1003)

* Implement signing feature

* Update app/lib/jrouter.dart

Co-authored-by: AhmedHanafy725 <41957921+AhmedHanafy725@users.noreply.github.com>

* Update app/lib/apps/sign/sign.dart

Co-authored-by: AhmedHanafy725 <41957921+AhmedHanafy725@users.noreply.github.com>

* Update app/lib/screens/signing/signing.dart

Co-authored-by: AhmedHanafy725 <41957921+AhmedHanafy725@users.noreply.github.com>

* Update app/lib/screens/signing/signing.dart

Co-authored-by: AhmedHanafy725 <41957921+AhmedHanafy725@users.noreply.github.com>

* Update app/lib/screens/signing/signing.dart

Co-authored-by: AhmedHanafy725 <41957921+AhmedHanafy725@users.noreply.github.com>

* Update app/lib/screens/signing/sign_with_text.dart

Co-authored-by: AhmedHanafy725 <41957921+AhmedHanafy725@users.noreply.github.com>

* Update app/lib/screens/signing/sign_with_text.dart

Co-authored-by: AhmedHanafy725 <41957921+AhmedHanafy725@users.noreply.github.com>

* add (hex encoded) faded && update qrcode logic

* update sign_with_url to try to fetch content first

* add optional field for destination url

* add signing in registered screen

* apply pr comments

* create base class for signing screens

* update signing icon && remove unused import

* move sendSignedData to signing_service file

* handle not loading wallets

* move all wallets logic to signing mixin

* Update styling of snackbars

* increase size of spinning && remove background color from error

* update CircularProgressIndicator to be consistent with app

---------

Co-authored-by: AhmedHanafy725 <41957921+AhmedHanafy725@users.noreply.github.com>

Author: AlaaElattar

app/lib/apps/sign/sign.dart

@@ -0,0 +1,42 @@
+import 'package:flutter/material.dart';
+import 'package:threebotlogin/app.dart';
+import 'package:threebotlogin/apps/farmers/farmers_user_data.dart';
+import 'package:threebotlogin/events/events.dart';
+import 'package:threebotlogin/events/go_home_event.dart';
+import 'package:threebotlogin/screens/signing/signing.dart';
+
+class Sign implements App {
+  static final Sign _singleton = Sign._internal();
+  static const Widget _signWidget = Signing();
+
+  factory Sign() {
+    return _singleton;
+  }
+
+  Sign._internal();
+
+  @override
+  Future<Widget> widget() async {
+    return _signWidget;
+  }
+
+  @override
+  void clearData() {
+    clearAllData();
+  }
+
+  @override
+  bool emailVerificationRequired() {
+    return false;
+  }
+
+  @override
+  bool pinRequired() {
+    return true;
+  }
+
+  @override
+  void back() {
+    Events().emit(GoHomeEvent());
+  }
+}

app/lib/jrouter.dart

@@ -9,6 +9,7 @@ import 'package:threebotlogin/screens/registered_screen.dart';
 
 import 'apps/farmers/farmers.dart';
 import 'apps/news/news.dart';
+import 'apps/sign/sign.dart';
 
 class AppInfo {
   Route route;
@@ -86,6 +87,14 @@ class JRouter {
             view: await Council().widget(),
           ),
           app: Dao()),
+      AppInfo(
+          route: Route(
+            path: '/sign',
+            name: 'Sign',
+            icon: Icons.draw_sharp,
+            view: await Sign().widget(),
+          ),
+          app: Sign()),
     ];
   }
 

app/lib/screens/registered_screen.dart

@@ -98,15 +98,23 @@ class _RegisteredScreenState extends State<RegisteredScreen>
                         icon: Icons.how_to_vote_outlined,
                         pageNumber: 4),
                     HomeCardWidget(
-                        name: 'News', icon: Icons.article, pageNumber: 1),
+                        name: 'Sign', icon: Icons.draw_sharp, pageNumber: 8),
                   ],
                 ),
                 const Row(
                   crossAxisAlignment: CrossAxisAlignment.center,
                   mainAxisAlignment: MainAxisAlignment.center,
                   children: [
+                    HomeCardWidget(
+                        name: 'News', icon: Icons.article, pageNumber: 1),
                     HomeCardWidget(
                         name: 'Identity', icon: Icons.person, pageNumber: 5),
+                  ],
+                ),
+                const Row(
+                  crossAxisAlignment: CrossAxisAlignment.center,
+                  mainAxisAlignment: MainAxisAlignment.center,
+                  children: [
                     HomeCardWidget(
                         name: 'Settings', icon: Icons.settings, pageNumber: 6),
                   ],