Add Liquid SDK Event & Log stream handlers to example app (#305)

Update example app
* Use defaultConfig on ConnectRequest
* Update feesSat as non-null
* Use payment & walletInfo streams from BreezLiquidSDK

packages/flutter/example/lib/routes/connect/connect_page.dart

@@ -3,13 +3,14 @@ import 'package:flutter/material.dart';
 import 'package:flutter_breez_liquid/flutter_breez_liquid.dart';
 import 'package:flutter_breez_liquid_example/routes/connect/restore_page.dart';
 import 'package:flutter_breez_liquid_example/routes/home/home_page.dart';
+import 'package:flutter_breez_liquid_example/services/breez_liquid_sdk.dart';
 import 'package:flutter_breez_liquid_example/services/credentials_manager.dart';
 import 'package:flutter_breez_liquid_example/utils/config.dart';
-import 'package:path_provider/path_provider.dart';
 
 class ConnectPage extends StatefulWidget {
+  final BreezLiquidSDK liquidSDK;
   final CredentialsManager credentialsManager;
-  const ConnectPage({super.key, required this.credentialsManager});
+  const ConnectPage({super.key, required this.liquidSDK, required this.credentialsManager});
 
   @override
   State<ConnectPage> createState() => _ConnectPageState();
@@ -84,7 +85,7 @@ class _ConnectPageState extends State<ConnectPage> {
             context,
             MaterialPageRoute(
               builder: (BuildContext context) => HomePage(
-                liquidSDK: liquidSDK,
+                liquidSDK: widget.liquidSDK,
                 credentialsManager: widget.credentialsManager,
               ),
             ),
@@ -103,6 +104,6 @@ class _ConnectPageState extends State<ConnectPage> {
       config: config,
       mnemonic: mnemonic,
     );
-    return await connect(req: req);
+    return await widget.liquidSDK.connect(req: req);
   }
 }

packages/flutter/example/lib/routes/home/home_page.dart

@@ -1,17 +1,17 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
-import 'package:flutter_breez_liquid/flutter_breez_liquid.dart';
 import 'package:flutter_breez_liquid_example/routes/home/widgets/balance.dart';
 import 'package:flutter_breez_liquid_example/routes/home/widgets/bottom_app_bar.dart';
 import 'package:flutter_breez_liquid_example/routes/home/widgets/drawer.dart';
 import 'package:flutter_breez_liquid_example/routes/home/widgets/payment_list/payment_list.dart';
 import 'package:flutter_breez_liquid_example/routes/home/widgets/qr_scan_action_button.dart';
+import 'package:flutter_breez_liquid_example/services/breez_liquid_sdk.dart';
 import 'package:flutter_breez_liquid_example/services/credentials_manager.dart';
 
 class HomePage extends StatefulWidget {
   final CredentialsManager credentialsManager;
-  final BindingLiquidSdk liquidSDK;
+  final BreezLiquidSDK liquidSDK;
 
   const HomePage({super.key, required this.credentialsManager, required this.liquidSDK});
 
@@ -20,26 +20,6 @@ class HomePage extends StatefulWidget {
 }
 
 class _HomePageState extends State<HomePage> {
-  Stream<GetInfoResponse> walletInfoStream() async* {
-    debugPrint("Initialized walletInfoStream");
-    yield await widget.liquidSDK.getInfo();
-    while (true) {
-      await Future.delayed(const Duration(seconds: 10));
-      yield await widget.liquidSDK.getInfo();
-      debugPrint("Refreshed wallet info");
-    }
-  }
-
-  Stream<List<Payment>> paymentsStream() async* {
-    debugPrint("Initialized paymentsStream");
-    yield await widget.liquidSDK.listPayments();
-    while (true) {
-      await Future.delayed(const Duration(seconds: 10));
-      yield await widget.liquidSDK.listPayments();
-      debugPrint("Refreshed payments");
-    }
-  }
-
   @override
   Widget build(BuildContext context) {
     return MaterialApp(
@@ -70,13 +50,13 @@ class _HomePageState extends State<HomePage> {
                 Container(
                   height: constraints.maxHeight * 0.3,
                   color: Colors.white,
-                  child: Balance(walletInfoStream: walletInfoStream().asBroadcastStream()),
+                  child: Balance(walletInfoStream: widget.liquidSDK.walletInfoStream),
                 ),
                 Container(
                   height: constraints.maxHeight * 0.7,
                   color: Colors.white,
                   child: PaymentList(
-                    paymentsStream: paymentsStream().asBroadcastStream(),
+                    paymentsStream: widget.liquidSDK.paymentsStream,
                     onRefresh: () async => await _sync(),
                   ),
                 ),
@@ -84,12 +64,13 @@ class _HomePageState extends State<HomePage> {
             );
           },
         ),
-        drawer: HomePageDrawer(liquidSDK: widget.liquidSDK, credentialsManager: widget.credentialsManager),
-        floatingActionButton: QrActionButton(liquidSDK: widget.liquidSDK),
+        drawer: HomePageDrawer(
+            liquidSDK: widget.liquidSDK.wallet!, credentialsManager: widget.credentialsManager),
+        floatingActionButton: QrActionButton(liquidSDK: widget.liquidSDK.wallet!),
         floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
         bottomNavigationBar: HomePageBottomAppBar(
-          liquidSDK: widget.liquidSDK,
-          paymentsStream: paymentsStream().asBroadcastStream(),
+          liquidSDK: widget.liquidSDK.wallet!,
+          paymentsStream: widget.liquidSDK.paymentsStream,
         ),
       ),
     );
@@ -98,7 +79,7 @@ class _HomePageState extends State<HomePage> {
   Future<void> _sync() async {
     try {
       debugPrint("Syncing wallet.");
-      await widget.liquidSDK.sync();
+      await widget.liquidSDK.wallet!.sync();
       debugPrint("Wallet synced!");
     } on Exception catch (e) {
       final errMsg = "Failed to sync wallet. $e";

packages/flutter/example/lib/routes/home/widgets/bottom_app_bar.dart

@@ -49,7 +49,7 @@ class HomePageBottomAppBar extends StatelessWidget {
                   context: context,
                   builder: (context) => ReceivePaymentDialog(
                     liquidSDK: liquidSDK,
-                    paymentsStream: paymentsStream.asBroadcastStream(),
+                    paymentsStream: paymentsStream,
                   ),
                 );
               },

packages/flutter/example/lib/routes/home/widgets/payment_list/widgets/payment_item.dart

@@ -62,7 +62,7 @@ class PaymentItem extends StatelessWidget {
             "${item.paymentType == PaymentType.send ? "-" : "+"}${item.amountSat} sats",
             style: Theme.of(context).textTheme.bodyLarge,
           ),
-          if (item.feesSat != null) ...[
+          if (item.feesSat != BigInt.zero) ...[
             Text("FEE: ${item.paymentType == PaymentType.receive ? "-" : ""}${item.feesSat} sats"),
           ]
         ],