feat: 💄 Show snackbar during RPC signTransactions command processing.

lib/l10n/intl_en.arb

@@ -746,5 +746,6 @@
     "logsDialogTitle": "Logs",
     "logsDesc": "If you encounter any problems, you can copy and send the information below to the Archethic support team.\nEnsure that no sensitive or private information that could affect the security of your funds is shared.",
     "logsCopied": "Logs copied",
-    "getSomeHelp": "Get some help"
+    "getSomeHelp": "Get some help",
+    "rpcSignTransactionsProcessing": "Processing transactions signature request"
 }

lib/l10n/intl_fr.arb

@@ -726,5 +726,6 @@
     "logsDialogTitle": "Journal",
     "logsDesc": "Si vous rencontrez des problèmes, vous pouvez copier et envoyer les informations ci-dessous à l'équipe support d'Archethic.\nVeillez à ce qu'aucune information sensible ou privée qui pourrait affecter la sécurité de vos fonds ne soit partagée.",
     "logsCopied": "Informations copiées",
-    "getSomeHelp": "Contactez nous"
+    "getSomeHelp": "Contactez nous",
+    "rpcSignTransactionsProcessing": "Traitement de la demande de signature"
 }

lib/ui/views/rpc_command_receiver/sign_transactions/command_handler.dart

@@ -7,9 +7,11 @@ import 'package:aewallet/ui/themes/archethic_theme.dart';
 import 'package:aewallet/ui/util/window_util_desktop.dart'
     if (dart.library.js) 'package:aewallet/ui/util/window_util_web.dart';
 import 'package:aewallet/ui/views/rpc_command_receiver/sign_transactions/layouts/sign_transactions_confirmation_form.dart';
+import 'package:aewallet/ui/views/rpc_command_receiver/util/processing_indicator.dart';
 import 'package:archethic_lib_dart/archethic_lib_dart.dart' as archethic;
 import 'package:archethic_wallet_client/archethic_wallet_client.dart' as awc;
 import 'package:flutter/material.dart';
+import 'package:flutter_gen/gen_l10n/localizations.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 const slippage = 1.01;
@@ -22,8 +24,13 @@ class SignTransactionsCommandHandler extends CommandHandler {
           canHandle: (command) =>
               command is RPCCommand<awc.SignTransactionRequest>,
           handle: (command) async {
+            final localizations = AppLocalizations.of(context)!;
             command as RPCCommand<awc.SignTransactionRequest>;
 
+            CommandHandlerLoadingSnackbar(
+              message: localizations.rpcSignTransactionsProcessing,
+            ).show(context);
+
             final signedTransactionList = <awc.SignTransactionsResultDetail>[];
             final serviceName = command.data.serviceName;
             final pathSuffix = command.data.pathSuffix;
@@ -84,6 +91,8 @@ class SignTransactionsCommandHandler extends CommandHandler {
               addresses.add(signedTransaction.address?.address);
             }
 
+            CommandHandlerLoadingSnackbar.hide(context);
+
             await WindowUtil().showFirst();
 
             final confirmation = await showDialog<bool>(
@@ -109,6 +118,10 @@ class SignTransactionsCommandHandler extends CommandHandler {
               );
             }
 
+            CommandHandlerLoadingSnackbar(
+              message: localizations.rpcSignTransactionsProcessing,
+            ).show(context);
+
             for (final rpcSignTransactionCommandData
                 in command.data.transactions) {
               final transaction = archethic.Transaction(
@@ -139,6 +152,8 @@ class SignTransactionsCommandHandler extends CommandHandler {
               index++;
             }
 
+            CommandHandlerLoadingSnackbar.hide(context);
+
             return Result.success(
               awc.SignTransactionsResult(signedTxs: signedTransactionList),
             );

lib/ui/views/rpc_command_receiver/util/processing_indicator.dart

@@ -0,0 +1,30 @@
+import 'package:flutter/material.dart';
+
+class CommandHandlerLoadingSnackbar extends SnackBar {
+  CommandHandlerLoadingSnackbar({super.key, required String message})
+      : super(
+          duration: const Duration(days: 1),
+          behavior: SnackBarBehavior.floating,
+          content: Row(
+            children: [
+              const CircularProgressIndicator(
+                strokeWidth: 2,
+              ),
+              const SizedBox(
+                width: 21,
+              ),
+              Text(message),
+            ],
+          ),
+        );
+
+  void show(BuildContext context) {
+    if (!context.mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(this);
+  }
+
+  static void hide(BuildContext context) {
+    if (!context.mounted) return;
+    ScaffoldMessenger.of(context).hideCurrentSnackBar();
+  }
+}