added solana sample

Author: quetool

example/sign/lib/solana_sample.dart

@@ -0,0 +1,114 @@
+import 'dart:convert';
+import 'dart:developer';
+
+import 'package:flutter/material.dart';
+import 'package:walletconnect_flutter_dapp/utils/dart_defines.dart';
+import 'package:walletconnect_flutter_v2/walletconnect_flutter_v2.dart';
+import 'package:walletconnect_modal_flutter/walletconnect_modal_flutter.dart';
+
+class SolanaSamplePage extends StatefulWidget {
+  const SolanaSamplePage({super.key});
+
+  @override
+  State<SolanaSamplePage> createState() => _MyHomePageState();
+}
+
+class _MyHomePageState extends State<SolanaSamplePage> {
+  bool _initialized = false;
+  IWalletConnectModalService? _modalService;
+
+  @override
+  void initState() {
+    super.initState();
+    initialize();
+  }
+
+  Future<void> initialize() async {
+    _modalService = WalletConnectModalService(
+      projectId: DartDefines.projectId,
+      metadata: const PairingMetadata(
+        name: 'Flutter Dapp Example',
+        description: 'Flutter Dapp Example',
+        url: 'https://www.walletconnect.com/',
+        icons: ['https://walletconnect.com/walletconnect-logo.png'],
+        redirect: Redirect(
+          native: 'flutterdapp://',
+          universal: 'https://www.walletconnect.com',
+        ),
+      ),
+      requiredNamespaces: {
+        'eip155': const RequiredNamespace(
+          chains: ['eip155:1'],
+          methods: [
+            'personal_sign',
+            'eth_sendTransaction',
+          ],
+          events: [
+            'chainChanged',
+            'accountsChanged',
+          ],
+        ),
+      },
+      optionalNamespaces: {
+        'solana': const RequiredNamespace(
+          chains: ['solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp'],
+          methods: [
+            'solana_signMessage',
+            'solana_signTransaction',
+          ],
+          events: [],
+        ),
+      },
+    );
+
+    await _modalService!.init();
+
+    _modalService!.web3App!.onSessionConnect.subscribe(_onSessionConnect);
+    _modalService!.web3App!.onSessionDelete.subscribe(_onSessionDisonnect);
+    _modalService!.web3App!.onSessionEvent.subscribe(_onSessionEvent);
+
+    setState(() => _initialized = true);
+  }
+
+  void _onSessionConnect(SessionConnect? args) {
+    log('_onSessionConnect ${jsonEncode(args?.session.toJson())}');
+  }
+
+  void _onSessionDisonnect(SessionDelete? args) {
+    log('_onSessionDisonnect ${args.toString()}');
+  }
+
+  void _onSessionEvent(SessionEvent? args) {
+    log('_onSessionEvent ${args.toString()}');
+  }
+
+  @override
+  void dispose() {
+    _modalService!.web3App!.onSessionConnect.unsubscribe(_onSessionConnect);
+    _modalService!.web3App!.onSessionDelete.unsubscribe(_onSessionDisonnect);
+    _modalService!.web3App!.onSessionEvent.unsubscribe(_onSessionEvent);
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (!_initialized) {
+      return Center(
+        child: CircularProgressIndicator(
+          color: WalletConnectModalTheme.getData(context).primary100,
+        ),
+      );
+    }
+
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('WalletConnectModal'),
+      ),
+      body: Center(
+        child: WalletConnectModalConnect(
+          service: _modalService!,
+        ),
+      ),
+    );
+  }
+}