Cw 870 ethereum enhancements (#1951)

* fix evm balance display issues

* fix adding token

* fix tab controller issue

* Update cw_evm/lib/evm_chain_client.dart [skip ci]

---------

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

cw_evm/lib/evm_chain_client.dart

@@ -268,12 +268,18 @@ abstract class EVMChainClient {
 
   Future<EVMChainERC20Balance> fetchERC20Balances(
       EthereumAddress userAddress, String contractAddress) async {
+    try {
       final erc20 = ERC20(address: EthereumAddress.fromHex(contractAddress), client: _client!);
       final balance = await erc20.balanceOf(userAddress);
 
     int exponent = (await erc20.decimals()).toInt();
 
       return EVMChainERC20Balance(balance, exponent: exponent);
+    } on RangeError catch (_) {
+      throw Exception('Invalid token contract for this network.');
+    } catch (e) {
+      throw Exception('Could not fetch balances: ${e.toString()}');
+    }
   }
 
   Future<Erc20Token?> getErc20Token(String contractAddress, String chainName) async {

cw_evm/lib/evm_chain_wallet.dart

@@ -634,14 +634,21 @@ abstract class EVMChainWalletBase
 
     final newToken = createNewErc20TokenObject(token, iconPath);
 
-    await evmChainErc20TokensBox.put(newToken.contractAddress, newToken);
-
     if (newToken.enabled) {
-      balance[newToken] = await _client.fetchERC20Balances(
+      try {
+        final erc20Balance = await _client.fetchERC20Balances(
           _evmChainPrivateKey.address,
           newToken.contractAddress,
         );
+
+        balance[newToken] = erc20Balance;
+
+        await evmChainErc20TokensBox.put(newToken.contractAddress, newToken);
+      } on Exception catch (_) {
+        rethrow;
+      }
     } else {
+      await evmChainErc20TokensBox.put(newToken.contractAddress, newToken);
       balance.remove(newToken);
     }
   }

cw_evm/lib/evm_erc20_balance.dart

@@ -1,5 +1,6 @@
 import 'dart:convert';
 import 'dart:math';
+import 'package:intl/intl.dart';
 
 import 'package:cw_core/balance.dart';
 
@@ -17,8 +18,10 @@ class EVMChainERC20Balance extends Balance {
   String get formattedAvailableBalance => _balance();
 
   String _balance() {
-    final String formattedBalance = (balance / BigInt.from(10).pow(exponent)).toString();
-    return formattedBalance.substring(0, min(12, formattedBalance.length));
+    NumberFormat formatter = NumberFormat('0.00##########', 'en_US');
+    double numBalance = (balance / BigInt.from(10).pow(exponent)).toDouble();
+    String formattedBalance = formatter.format(numBalance);
+    return formattedBalance;
   }
 
   String toJSON() => json.encode({

lib/src/screens/dashboard/edit_token_page.dart

@@ -212,6 +212,7 @@ class _EditTokenPageBodyState extends State<EditTokenPageBody> {
                               _contractAddressController.text,
                             );
                             final actionCall = () async {
+                              try {
                                 await widget.homeSettingsViewModel.addToken(
                                   token: CryptoCurrency(
                                     name: _tokenNameController.text,
@@ -221,6 +222,24 @@ class _EditTokenPageBodyState extends State<EditTokenPageBody> {
                                   ),
                                   contractAddress: _contractAddressController.text,
                                 );
+
+                                if (mounted) {
+                                  Navigator.pop(context);
+                                }
+
+                              } catch (e) {
+                                showPopUp<void>(
+                                  context: context,
+                                  builder: (dialogContext) {
+                                    return AlertWithOneAction(
+                                      alertTitle: S.current.warning,
+                                      alertContent: e.toString(),
+                                      buttonText: S.of(context).ok,
+                                      buttonAction: () => Navigator.of(dialogContext).pop(),
+                                    );
+                                  },
+                                );
+                              }
                             };
 
                             if (hasPotentialError) {
@@ -235,9 +254,6 @@ class _EditTokenPageBodyState extends State<EditTokenPageBody> {
                                     actionRightButton: () async {
                                       Navigator.of(dialogContext).pop();
                                       await actionCall();
-                                      if (mounted) {
-                                        Navigator.pop(context);
-                                      }
                                     },
                                     actionLeftButton: () => Navigator.of(dialogContext).pop(),
                                   );

lib/src/screens/dashboard/pages/balance/balance_page.dart

@@ -25,6 +25,7 @@ class BalancePage extends StatelessWidget {
       builder: (context) {
         final isEVMCompatible = isEVMCompatibleChain(dashboardViewModel.type);
         return DefaultTabController(
+          key: ValueKey<bool>(isEVMCompatible),
           length: isEVMCompatible ? 2 : 1,
           child: Column(
             children: [

lib/view_model/dashboard/home_settings_view_model.dart

@@ -117,7 +117,10 @@ abstract class HomeSettingsViewModelBase with Store {
       
       _updateTokensList();
       _updateFiatPrices(token);
-    } finally {
+    } catch (e) {
+      throw e;
+  }
+    finally {
       isAddingToken = false;
     }
   }