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Service listener usage sample
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class MyHomePage extends StatefulWidget { | |
const MyHomePage({super.key, required this.title}); | |
final String title; | |
@override | |
State<MyHomePage> createState() => _MyHomePageState(); | |
} | |
class _MyHomePageState extends State<MyHomePage> { | |
W3MService? _w3mService; | |
// enable Coinbase https://docs.walletconnect.com/web3modal/flutter/installation#enable-coinbase-wallet | |
bool _isConnected = false; | |
@override | |
void initState() { | |
super.initState(); | |
WidgetsBinding.instance.addPostFrameCallback((timeStamp) async { | |
debugPrint('[$runtimeType] builded after $timeStamp'); | |
_w3mService = W3MService( | |
projectId: 'cad4956f31a5e40a00b62865b030c6f8', | |
metadata: const PairingMetadata( | |
name: 'Web3Modal Flutter Example', | |
description: 'Web3Modal Flutter Example', | |
url: 'https://web3modal.com/', | |
icons: [ | |
'https://docs.walletconnect.com/assets/images/web3modalLogo-2cee77e07851ba0a710b56d03d4d09dd.png' | |
], | |
redirect: Redirect( | |
native: 'flutterdapp://', | |
universal: 'https://web3modal.com', | |
), | |
), | |
); | |
_w3mService?.addListener(_isConnectedListener); | |
_w3mService?.addListener(_isDisconnectedListener); | |
_w3mService?.onSessionConnectEvent.subscribe(_onSessionConnect); | |
_w3mService?.onCoinbaseConnect.subscribe(_onCoinbaseConnect); | |
await _w3mService?.init(); | |
}); | |
} | |
@override | |
void dispose() { | |
_w3mService?.removeListener(_isConnectedListener); | |
_w3mService?.removeListener(_isDisconnectedListener); | |
_w3mService?.onSessionConnectEvent.unsubscribe(_onSessionConnect); | |
_w3mService?.onCoinbaseConnect.unsubscribe(_onCoinbaseConnect); | |
super.dispose(); | |
} | |
void _isConnectedListener() { | |
if (!_isConnected && _w3mService?.isConnected == true) { | |
_isConnected = _w3mService!.isConnected; | |
// code here will be executed just once upon connection | |
} | |
setState(() {}); | |
} | |
void _isDisconnectedListener() { | |
if (_isConnected && _w3mService?.isConnected == false) { | |
_isConnected = _w3mService!.isConnected; | |
// code here will be executed just once upon disconnection | |
} | |
setState(() {}); | |
} | |
void _onSessionConnect(SessionConnect? args) { | |
final address = args?.session.namespaces['eip155']?.accounts.first; | |
debugPrint('[$runtimeType] _onSessionConnect $address'); | |
} | |
void _onCoinbaseConnect(CoinbaseConnectEvent? event) { | |
final address = event?.data?.address; | |
debugPrint('[$runtimeType] _onCoinbaseConnect $address}'); | |
} | |
@override | |
Widget build(BuildContext context) { | |
final isConnected = _w3mService?.isConnected ?? false; | |
return Scaffold( | |
appBar: AppBar( | |
backgroundColor: Theme.of(context).colorScheme.inversePrimary, | |
title: Text(widget.title), | |
), | |
body: Center( | |
child: Column( | |
mainAxisAlignment: MainAxisAlignment.center, | |
children: <Widget>[ | |
Text( | |
'Connected: ${_w3mService?.session?.connectedWalletName}', | |
style: Theme.of(context).textTheme.headlineMedium, | |
), | |
const SizedBox(height: 10.0), | |
Visibility( | |
visible: isConnected, | |
child: ElevatedButton( | |
onPressed: () async { | |
final cid = _w3mService?.selectedChain?.chainId ?? 1; | |
_w3mService?.launchConnectedWallet(); | |
final response = await _w3mService?.request( | |
topic: _w3mService?.session?.topic ?? '', | |
chainId: 'eip155:$cid', | |
request: SessionRequestParams( | |
method: 'personal_sign', | |
params: [ | |
'Hello world!', | |
_w3mService?.session?.address, | |
], | |
), | |
); | |
debugPrint(response); | |
}, | |
child: const Text('personal_sign'), | |
), | |
), | |
], | |
), | |
), | |
floatingActionButton: FloatingActionButton( | |
onPressed: () { | |
_w3mService?.openModal(context); | |
}, | |
child: const Icon( | |
Icons.change_circle_rounded, | |
size: 30.0, | |
), | |
), | |
); | |
} | |
} |
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