CAKE-143 | added status parameter to exchange_view_model.dart; called alert when user tries exchange deposit xmr currency but wallet is not synchronized

lib/src/screens/exchange/exchange_page.dart

@@ -1,4 +1,5 @@
 import 'dart:ui';
+import 'package:cake_wallet/entities/sync_status.dart';
 import 'package:dotted_border/dotted_border.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
@@ -398,15 +399,26 @@ class ExchangePage extends BasePage {
                       text: S.of(context).exchange,
                       onPressed: () {
                         if (_formKey.currentState.validate()) {
+                          if ((exchangeViewModel.depositCurrency == CryptoCurrency.xmr)
+                          &&(!(exchangeViewModel.status is SyncedSyncStatus))) {
+                            showPopUp<void>(
+                              context: context,
+                              builder: (BuildContext context) {
+                                return AlertWithOneAction(
+                                  alertTitle: S.of(context).exchange,
+                                  alertContent: 'Please wait until your wallet is synchronized',
+                                  buttonText: S.of(context).ok,
+                                  buttonAction: () => Navigator.of(context).pop());
+                              });
+                          } else {
                             exchangeViewModel.createTrade();
                           }
+                        }
                       },
-                            color:
+                      color: Theme.of(context).accentTextTheme.body2.color,
-                                Theme.of(context).accentTextTheme.body2.color,
                       textColor: Colors.white,
                       isLoading: exchangeViewModel.tradeState
-                                is TradeIsCreating,
+                                 is TradeIsCreating)),
-                          )),
                 ]),
               )),
         ));

lib/view_model/exchange/exchange_view_model.dart

@@ -1,5 +1,6 @@
 import 'package:cake_wallet/core/wallet_base.dart';
 import 'package:cake_wallet/entities/crypto_currency.dart';
+import 'package:cake_wallet/entities/sync_status.dart';
 import 'package:cake_wallet/entities/wallet_type.dart';
 import 'package:cake_wallet/exchange/exchange_provider.dart';
 import 'package:cake_wallet/exchange/limits.dart';
@@ -100,6 +101,9 @@ abstract class ExchangeViewModelBase with Store {
 
   NumberFormat _cryptoNumberFormat;
 
+  @computed
+  SyncStatus get status => wallet.syncStatus;
+
   @computed
   ObservableList<ExchangeTemplate> get templates =>
       _exchangeTemplateStore.templates;