Cw 473 exchange refactoring (#1126)

* CW-473 Remove deprecated Exchanges

* CW-473 Clean up Exchange Code

* CW-473 Add Decimals to Crypto Enums

* CW-473 Fix minor merge error

* CW-473 Fix minor merge error

* CW-473 Fix FAQ Locals

* CW-473 Apply requested changes

* CW-473 Show Error if Exchange Provider is not supported anymore

* CW-473 Implement Requested Changes

lib/view_model/exchange/exchange_trade_view_model.dart

@@ -1,22 +1,21 @@
 import 'dart:async';
-import 'package:cake_wallet/exchange/exolix/exolix_exchange_provider.dart';
-import 'package:cake_wallet/exchange/sideshift/sideshift_exchange_provider.dart';
-import 'package:cake_wallet/exchange/simpleswap/simpleswap_exchange_provider.dart';
-import 'package:cake_wallet/exchange/trocador/trocador_exchange_provider.dart';
-import 'package:cw_core/wallet_base.dart';
-import 'package:cw_core/crypto_currency.dart';
-import 'package:cake_wallet/exchange/changenow/changenow_exchange_provider.dart';
-import 'package:cake_wallet/exchange/exchange_provider.dart';
+
 import 'package:cake_wallet/exchange/exchange_provider_description.dart';
-import 'package:cake_wallet/exchange/morphtoken/morphtoken_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/changenow_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/exolix_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/sideshift_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/simpleswap_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/trocador_exchange_provider.dart';
 import 'package:cake_wallet/exchange/trade.dart';
-import 'package:cake_wallet/exchange/xmrto/xmrto_exchange_provider.dart';
+import 'package:cake_wallet/generated/i18n.dart';
+import 'package:cake_wallet/src/screens/exchange_trade/exchange_trade_item.dart';
 import 'package:cake_wallet/store/dashboard/trades_store.dart';
 import 'package:cake_wallet/view_model/send/send_view_model.dart';
+import 'package:cw_core/crypto_currency.dart';
+import 'package:cw_core/wallet_base.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
-import 'package:cake_wallet/src/screens/exchange_trade/exchange_trade_item.dart';
-import 'package:cake_wallet/generated/i18n.dart';
 
 part 'exchange_trade_view_model.g.dart';
 
@@ -35,16 +34,10 @@ abstract class ExchangeTradeViewModelBase with Store {
                 tradesStore.trade!.from.tag == CryptoCurrency.eth.title),
         items = ObservableList<ExchangeTradeItem>() {
     switch (trade.provider) {
-      case ExchangeProviderDescription.xmrto:
-        _provider = XMRTOExchangeProvider();
-        break;
       case ExchangeProviderDescription.changeNow:
         _provider =
             ChangeNowExchangeProvider(settingsStore: sendViewModel.balanceViewModel.settingsStore);
         break;
-      case ExchangeProviderDescription.morphToken:
-        _provider = MorphTokenExchangeProvider(trades: trades);
-        break;
       case ExchangeProviderDescription.sideShift:
         _provider = SideShiftExchangeProvider();
         break;
@@ -60,8 +53,11 @@ abstract class ExchangeTradeViewModelBase with Store {
     }
 
     _updateItems();
-    _updateTrade();
-    timer = Timer.periodic(Duration(seconds: 20), (_) async => _updateTrade());
+
+    if (_provider != null) {
+      _updateTrade();
+      timer = Timer.periodic(Duration(seconds: 20), (_) async => _updateTrade());
+    }
   }
 
   final WalletBase wallet;
@@ -100,10 +96,8 @@ abstract class ExchangeTradeViewModelBase with Store {
   Timer? timer;
 
   @action
-  Future confirmSending() async {
-    if (!isSendable) {
-      return;
-    }
+  Future<void> confirmSending() async {
+    if (!isSendable) return;
 
     sendViewModel.clearOutputs();
     final output = sendViewModel.outputs.first;
@@ -118,13 +112,10 @@ abstract class ExchangeTradeViewModelBase with Store {
     try {
       final updatedTrade = await _provider!.findTradeById(id: trade.id);
 
-      if (updatedTrade.createdAt == null && trade.createdAt != null) {
+      if (updatedTrade.createdAt == null && trade.createdAt != null)
         updatedTrade.createdAt = trade.createdAt;
-      }
 
-      if (updatedTrade.amount.isEmpty) {
-        updatedTrade.amount = trade.amount;
-      }
+      if (updatedTrade.amount.isEmpty) updatedTrade.amount = trade.amount;
 
       trade = updatedTrade;
 

lib/view_model/exchange/exchange_view_model.dart

@@ -3,48 +3,39 @@ import 'dart:collection';
 import 'dart:convert';
 
 import 'package:cake_wallet/bitcoin_cash/bitcoin_cash.dart';
+import 'package:cake_wallet/bitcoin/bitcoin.dart';
 import 'package:cake_wallet/core/wallet_change_listener_view_model.dart';
 import 'package:cake_wallet/entities/exchange_api_mode.dart';
 import 'package:cake_wallet/entities/preferences_key.dart';
 import 'package:cake_wallet/entities/wallet_contact.dart';
 import 'package:cake_wallet/ethereum/ethereum.dart';
-import 'package:cake_wallet/exchange/exolix/exolix_exchange_provider.dart';
-import 'package:cake_wallet/exchange/exolix/exolix_request.dart';
-import 'package:cake_wallet/exchange/sideshift/sideshift_exchange_provider.dart';
-import 'package:cake_wallet/exchange/sideshift/sideshift_request.dart';
-import 'package:cake_wallet/exchange/simpleswap/simpleswap_exchange_provider.dart';
-import 'package:cake_wallet/exchange/simpleswap/simpleswap_request.dart';
-import 'package:cake_wallet/exchange/trocador/trocador_exchange_provider.dart';
-import 'package:cake_wallet/exchange/trocador/trocador_request.dart';
-import 'package:cake_wallet/utils/feature_flag.dart';
-import 'package:cake_wallet/view_model/contact_list/contact_list_view_model.dart';
-import 'package:cw_core/transaction_priority.dart';
-import 'package:cake_wallet/store/app_store.dart';
-import 'package:cw_core/crypto_currency.dart';
-import 'package:cw_core/sync_status.dart';
-import 'package:cw_core/wallet_type.dart';
-import 'package:cake_wallet/bitcoin/bitcoin.dart';
-import 'package:cake_wallet/monero/monero.dart';
-import 'package:cake_wallet/exchange/exchange_provider.dart';
+import 'package:cake_wallet/exchange/exchange_template.dart';
+import 'package:cake_wallet/exchange/exchange_trade_state.dart';
 import 'package:cake_wallet/exchange/limits.dart';
-import 'package:cake_wallet/exchange/trade.dart';
 import 'package:cake_wallet/exchange/limits_state.dart';
+import 'package:cake_wallet/exchange/provider/changenow_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/exolix_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/sideshift_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/simpleswap_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/trocador_exchange_provider.dart';
+import 'package:cake_wallet/exchange/trade.dart';
+import 'package:cake_wallet/exchange/trade_request.dart';
+import 'package:cake_wallet/generated/i18n.dart';
+import 'package:cake_wallet/monero/monero.dart';
+import 'package:cake_wallet/store/app_store.dart';
 import 'package:cake_wallet/store/dashboard/trades_store.dart';
 import 'package:cake_wallet/store/settings_store.dart';
+import 'package:cake_wallet/store/templates/exchange_template_store.dart';
+import 'package:cake_wallet/utils/feature_flag.dart';
+import 'package:cake_wallet/view_model/contact_list/contact_list_view_model.dart';
+import 'package:cw_core/crypto_currency.dart';
+import 'package:cw_core/sync_status.dart';
+import 'package:cw_core/transaction_priority.dart';
+import 'package:cw_core/wallet_type.dart';
+import 'package:hive/hive.dart';
 import 'package:intl/intl.dart';
 import 'package:mobx/mobx.dart';
-import 'package:cake_wallet/generated/i18n.dart';
-import 'package:hive/hive.dart';
-import 'package:cake_wallet/exchange/exchange_trade_state.dart';
-import 'package:cake_wallet/exchange/changenow/changenow_exchange_provider.dart';
-import 'package:cake_wallet/exchange/changenow/changenow_request.dart';
-import 'package:cake_wallet/exchange/trade_request.dart';
-import 'package:cake_wallet/exchange/xmrto/xmrto_exchange_provider.dart';
-import 'package:cake_wallet/exchange/xmrto/xmrto_trade_request.dart';
-import 'package:cake_wallet/exchange/morphtoken/morphtoken_exchange_provider.dart';
-import 'package:cake_wallet/exchange/morphtoken/morphtoken_request.dart';
-import 'package:cake_wallet/store/templates/exchange_template_store.dart';
-import 'package:cake_wallet/exchange/exchange_template.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 part 'exchange_view_model.g.dart';
@@ -144,6 +135,7 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
       _calculateBestRate();
     });
   }
+
   bool _useTorOnly;
   final Box<Trade> trades;
   final ExchangeTemplateStore _exchangeTemplateStore;
@@ -384,13 +376,9 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
     double minLimit = limits.min ?? 0;
     double? maxLimit = limits.max;
 
-    if (_enteredAmount < minLimit) {
-      return false;
-    }
+    if (_enteredAmount < minLimit) return false;
 
-    if (maxLimit != null && _enteredAmount > maxLimit) {
-      return false;
-    }
+    if (maxLimit != null && _enteredAmount > maxLimit) return false;
 
     return true;
   }
@@ -422,16 +410,12 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
         }
       }
     }
-    if (_sortedAvailableProviders.isNotEmpty) {
-      _bestRate = _sortedAvailableProviders.keys.first;
-    }
+    if (_sortedAvailableProviders.isNotEmpty) _bestRate = _sortedAvailableProviders.keys.first;
   }
 
   @action
   Future<void> loadLimits() async {
-    if (selectedProviders.isEmpty) {
-      return;
-    }
+    if (selectedProviders.isEmpty) return;
 
     limitsState = LimitsIsLoading();
 
@@ -444,20 +428,16 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
     try {
       for (var provider in selectedProviders) {
         /// if this provider is not valid for the current pair, skip it
-        if (!providersForCurrentPair().contains(provider)) {
-          continue;
-        }
+        if (!providersForCurrentPair().contains(provider)) continue;
 
         try {
           final tempLimits =
               await provider.fetchLimits(from: from, to: to, isFixedRateMode: isFixedRateMode);
 
-          if (lowestMin != null && (tempLimits.min ?? -1) < lowestMin) {
-            lowestMin = tempLimits.min;
-          }
-          if (highestMax != null && (tempLimits.max ?? double.maxFinite) > highestMax) {
+          if (lowestMin != null && (tempLimits.min ?? -1) < lowestMin) lowestMin = tempLimits.min;
+
+          if (highestMax != null && (tempLimits.max ?? double.maxFinite) > highestMax)
             highestMax = tempLimits.max;
-          }
         } catch (e) {
           continue;
         }
@@ -482,111 +462,34 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
 
   @action
   Future<void> createTrade() async {
-    TradeRequest? request;
-    String amount = '';
-
     try {
       for (var provider in _sortedAvailableProviders.values) {
-        if (!(await provider.checkIsAvailable())) {
-          continue;
-        }
+        if (!(await provider.checkIsAvailable())) continue;
 
-        if (provider is SideShiftExchangeProvider) {
-          request = SideShiftRequest(
-            depositMethod: depositCurrency,
-            settleMethod: receiveCurrency,
-            depositAmount: isFixedRateMode
-                ? receiveAmount.replaceAll(',', '.')
-                : depositAmount.replaceAll(',', '.'),
-            settleAddress: receiveAddress,
+        final request = TradeRequest(
+            fromCurrency: depositCurrency,
+            toCurrency: receiveCurrency,
+            fromAmount: depositAmount.replaceAll(',', '.'),
+            toAmount: receiveAmount.replaceAll(',', '.'),
             refundAddress: depositAddress,
-          );
-          amount = isFixedRateMode ? receiveAmount : depositAmount;
-        }
-
-        if (provider is SimpleSwapExchangeProvider) {
-          request = SimpleSwapRequest(
-            from: depositCurrency,
-            to: receiveCurrency,
-            amount: depositAmount.replaceAll(',', '.'),
-            address: receiveAddress,
-            refundAddress: depositAddress,
-          );
-          amount = isFixedRateMode ? receiveAmount : depositAmount;
-        }
-
-        if (provider is XMRTOExchangeProvider) {
-          request = XMRTOTradeRequest(
-              from: depositCurrency,
-              to: receiveCurrency,
-              amount: depositAmount.replaceAll(',', '.'),
-              receiveAmount: receiveAmount.replaceAll(',', '.'),
-              address: receiveAddress,
-              refundAddress: depositAddress,
-              isBTCRequest: isReceiveAmountEntered);
-          amount = isFixedRateMode ? receiveAmount : depositAmount;
-        }
-
-        if (provider is ChangeNowExchangeProvider) {
-          request = ChangeNowRequest(
-              from: depositCurrency,
-              to: receiveCurrency,
-              fromAmount: depositAmount.replaceAll(',', '.'),
-              toAmount: receiveAmount.replaceAll(',', '.'),
-              refundAddress: depositAddress,
-              address: receiveAddress,
-              isReverse: isFixedRateMode);
-          amount = isFixedRateMode ? receiveAmount : depositAmount;
-        }
-
-        if (provider is MorphTokenExchangeProvider) {
-          request = MorphTokenRequest(
-              from: depositCurrency,
-              to: receiveCurrency,
-              amount: depositAmount.replaceAll(',', '.'),
-              refundAddress: depositAddress,
-              address: receiveAddress);
-          amount = isFixedRateMode ? receiveAmount : depositAmount;
-        }
-
-        if (provider is TrocadorExchangeProvider) {
-          request = TrocadorRequest(
-              from: depositCurrency,
-              to: receiveCurrency,
-              fromAmount: depositAmount.replaceAll(',', '.'),
-              toAmount: receiveAmount.replaceAll(',', '.'),
-              refundAddress: depositAddress,
-              address: receiveAddress,
-              isReverse: isFixedRateMode);
-          amount = isFixedRateMode ? receiveAmount : depositAmount;
-        }
-
-        if (provider is ExolixExchangeProvider) {
-          request = ExolixRequest(
-              from: depositCurrency,
-              to: receiveCurrency,
-              fromAmount: depositAmount.replaceAll(',', '.'),
-              toAmount: receiveAmount.replaceAll(',', '.'),
-              refundAddress: depositAddress,
-              address: receiveAddress);
-          amount = isFixedRateMode ? receiveAmount : depositAmount;
-        }
+            toAddress: receiveAddress,
+            isFixedRate: isFixedRateMode);
 
+        var amount = isFixedRateMode ? receiveAmount : depositAmount;
         amount = amount.replaceAll(',', '.');
 
         if (limitsState is LimitsLoadedSuccessfully) {
-          if (double.tryParse(amount) == null) {
+          if (double.tryParse(amount) == null) continue;
+
+          if (limits.max != null && double.parse(amount) < limits.min!)
             continue;
-          }
-          if (limits.max != null && double.parse(amount) < limits.min!) {
+          else if (limits.max != null && double.parse(amount) > limits.max!)
             continue;
-          } else if (limits.max != null && double.parse(amount) > limits.max!) {
-            continue;
-          } else {
+          else {
             try {
               tradeState = TradeIsCreating();
               final trade =
-                  await provider.createTrade(request: request!, isFixedRateMode: isFixedRateMode);
+                  await provider.createTrade(request: request, isFixedRateMode: isFixedRateMode);
               trade.walletId = wallet.id;
               tradesStore.setTrade(trade);
               await trades.add(trade);
@@ -636,9 +539,7 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
       final priority = _settingsStore.priority[wallet.type]!;
       final fee = wallet.calculateEstimatedFee(priority, null);
 
-      if (availableBalance < fee || availableBalance == 0) {
-        return;
-      }
+      if (availableBalance < fee || availableBalance == 0) return;
 
       final amount = availableBalance - fee;
       changeDepositAmount(amount: bitcoin!.formatterBitcoinAmountToString(amount: amount));
@@ -669,19 +570,15 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
   void removeTemplate({required ExchangeTemplate template}) =>
       _exchangeTemplateStore.remove(template: template);
 
-  List<ExchangeProvider> providersForCurrentPair() {
-    return _providersForPair(from: depositCurrency, to: receiveCurrency);
-  }
+  List<ExchangeProvider> providersForCurrentPair() =>
+      _providersForPair(from: depositCurrency, to: receiveCurrency);
 
   List<ExchangeProvider> _providersForPair(
-      {required CryptoCurrency from, required CryptoCurrency to}) {
-    final providers = providerList
-        .where((provider) =>
-            provider.pairList.where((pair) => pair.from == from && pair.to == to).isNotEmpty)
-        .toList();
-
-    return providers;
-  }
+          {required CryptoCurrency from, required CryptoCurrency to}) =>
+      providerList
+          .where((provider) =>
+              provider.pairList.where((pair) => pair.from == from && pair.to == to).isNotEmpty)
+          .toList();
 
   void _onPairChange() {
     depositAmount = '';
@@ -744,9 +641,7 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
   @action
   void addExchangeProvider(ExchangeProvider provider) {
     selectedProviders.add(provider);
-    if (providersForCurrentPair().contains(provider)) {
-      _tradeAvailableProviders.add(provider);
-    }
+    if (providersForCurrentPair().contains(provider)) _tradeAvailableProviders.add(provider);
   }
 
   @action
@@ -817,14 +712,13 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
   }
 
   void _setProviders() {
-    if (_settingsStore.exchangeStatus == ExchangeApiMode.torOnly) {
+    if (_settingsStore.exchangeStatus == ExchangeApiMode.torOnly)
       providerList = _allProviders.where((provider) => provider.supportsOnionAddress).toList();
-    } else {
+    else
       providerList = _allProviders;
-    }
   }
 
-  int get depositMaxDigits => depositCurrency == CryptoCurrency.btc ? 8 : 12;
+  int get depositMaxDigits => depositCurrency.decimals;
 
-  int get receiveMaxDigits => receiveCurrency == CryptoCurrency.btc ? 8 : 12;
+  int get receiveMaxDigits => receiveCurrency.decimals;
 }

lib/view_model/trade_details_view_model.dart

@@ -1,28 +1,28 @@
 import 'dart:async';
-import 'package:cake_wallet/exchange/changenow/changenow_exchange_provider.dart';
-import 'package:cake_wallet/exchange/exchange_provider.dart';
+
 import 'package:cake_wallet/exchange/exchange_provider_description.dart';
-import 'package:cake_wallet/exchange/exolix/exolix_exchange_provider.dart';
-import 'package:cake_wallet/exchange/morphtoken/morphtoken_exchange_provider.dart';
-import 'package:cake_wallet/exchange/sideshift/sideshift_exchange_provider.dart';
-import 'package:cake_wallet/exchange/simpleswap/simpleswap_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/changenow_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/exolix_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/sideshift_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/simpleswap_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/trocador_exchange_provider.dart';
 import 'package:cake_wallet/exchange/trade.dart';
-import 'package:cake_wallet/exchange/trocador/trocador_exchange_provider.dart';
-import 'package:cake_wallet/exchange/xmrto/xmrto_exchange_provider.dart';
+import 'package:cake_wallet/generated/i18n.dart';
+import 'package:cake_wallet/src/screens/trade_details/track_trade_list_item.dart';
+import 'package:cake_wallet/src/screens/trade_details/trade_details_list_card.dart';
+import 'package:cake_wallet/src/screens/trade_details/trade_details_status_item.dart';
+import 'package:cake_wallet/src/screens/trade_details/trade_provider_unsupported_item.dart';
+import 'package:cake_wallet/src/screens/transaction_details/standart_list_item.dart';
 import 'package:cake_wallet/store/settings_store.dart';
 import 'package:cake_wallet/utils/date_formatter.dart';
 import 'package:cake_wallet/utils/show_bar.dart';
+import 'package:collection/collection.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/services.dart';
 import 'package:hive/hive.dart';
 import 'package:mobx/mobx.dart';
-import 'package:cake_wallet/generated/i18n.dart';
-import 'package:cake_wallet/src/screens/transaction_details/standart_list_item.dart';
-import 'package:cake_wallet/src/screens/trade_details/track_trade_list_item.dart';
-import 'package:cake_wallet/src/screens/trade_details/trade_details_list_card.dart';
-import 'package:cake_wallet/src/screens/trade_details/trade_details_status_item.dart';
 import 'package:url_launcher/url_launcher.dart';
-import 'package:collection/collection.dart';
 
 part 'trade_details_view_model.g.dart';
 
@@ -37,15 +37,9 @@ abstract class TradeDetailsViewModelBase with Store {
         trade = trades.values.firstWhereOrNull((element) => element.id == tradeForDetails.id) ??
             tradeForDetails {
     switch (trade.provider) {
-      case ExchangeProviderDescription.xmrto:
-        _provider = XMRTOExchangeProvider();
-        break;
       case ExchangeProviderDescription.changeNow:
         _provider = ChangeNowExchangeProvider(settingsStore: settingsStore);
         break;
-      case ExchangeProviderDescription.morphToken:
-        _provider = MorphTokenExchangeProvider(trades: trades);
-        break;
       case ExchangeProviderDescription.sideShift:
         _provider = SideShiftExchangeProvider();
         break;
@@ -62,9 +56,10 @@ abstract class TradeDetailsViewModelBase with Store {
 
     _updateItems();
 
-    _updateTrade();
-
-    timer = Timer.periodic(Duration(seconds: 20), (_) async => _updateTrade());
+    if (_provider != null) {
+      _updateTrade();
+      timer = Timer.periodic(Duration(seconds: 20), (_) async => _updateTrade());
+    }
   }
 
   final Box<Trade> trades;
@@ -86,9 +81,9 @@ abstract class TradeDetailsViewModelBase with Store {
     try {
       final updatedTrade = await _provider!.findTradeById(id: trade.id);
 
-      if (updatedTrade.createdAt == null && trade.createdAt != null) {
+      if (updatedTrade.createdAt == null && trade.createdAt != null)
         updatedTrade.createdAt = trade.createdAt;
-      }
+
       Trade? foundElement = trades.values.firstWhereOrNull((element) => element.id == trade.id);
       if (foundElement != null) {
         final editedTrade = trades.get(foundElement.key);
@@ -109,6 +104,10 @@ abstract class TradeDetailsViewModelBase with Store {
 
     items.clear();
 
+    if (_provider == null)
+      items.add(TradeProviderUnsupportedItem(
+          error: S.current.exchange_provider_unsupported(trade.provider.title)));
+
     items.add(
         DetailsListStatusItem(title: S.current.trade_details_state, value: trade.state.toString()));
 
@@ -165,7 +164,7 @@ abstract class TradeDetailsViewModelBase with Store {
     if (trade.provider == ExchangeProviderDescription.exolix) {
       final buildURL = 'https://exolix.com/transaction/${trade.id.toString()}';
       items.add(
-        TrackTradeListItem(title: 'Track', value: buildURL, onTap: () => _launchUrl(buildURL)));
+          TrackTradeListItem(title: 'Track', value: buildURL, onTap: () => _launchUrl(buildURL)));
     }
   }