CWA-212 | created exchange template and exchange template store; added exchange cards to exchange template page; added exchange templates to exchange page; added provider icons to provider picker

lib/src/stores/exchange/exchange_store.dart

@@ -33,6 +33,10 @@ abstract class ExchangeStoreBase with Store {
     provider = initialProvider;
     depositCurrency = initialDepositCurrency;
     receiveCurrency = initialReceiveCurrency;
+    depositAmount = '';
+    receiveAmount = '';
+    depositAddress = '';
+    receiveAddress = '';
     limitsState = LimitsInitialState();
     tradeState = ExchangeTradeStateInitial();
     _cryptoNumberFormat = NumberFormat()..maximumFractionDigits = 12;
@@ -63,6 +67,12 @@ abstract class ExchangeStoreBase with Store {
   @observable
   String receiveAmount;
 
+  @observable
+  String depositAddress;
+
+  @observable
+  String receiveAddress;
+
   @observable
   bool isValid;
 
@@ -71,10 +81,6 @@ abstract class ExchangeStoreBase with Store {
 
   Box<Trade> trades;
 
-  String depositAddress;
-
-  String receiveAddress;
-
   WalletStore walletStore;
 
   Limits limits;

lib/src/stores/exchange_template/exchange_template_store.dart

@@ -0,0 +1,40 @@
+import 'dart:async';
+import 'package:mobx/mobx.dart';
+import 'package:hive/hive.dart';
+import 'package:cake_wallet/src/domain/exchange/exchange_template.dart';
+
+part 'exchange_template_store.g.dart';
+
+class ExchangeTemplateStore = ExchangeTemplateBase with _$ExchangeTemplateStore;
+
+abstract class ExchangeTemplateBase with Store {
+  ExchangeTemplateBase({this.templateSource}) {
+    templates = ObservableList<ExchangeTemplate>();
+    update();
+  }
+
+  @observable
+  ObservableList<ExchangeTemplate> templates;
+
+  Box<ExchangeTemplate> templateSource;
+
+  @action
+  void update() =>
+      templates.replaceRange(0, templates.length, templateSource.values.toList());
+
+  @action
+  Future addTemplate({String amount, String depositCurrency, String receiveCurrency,
+    String provider, String depositAddress, String receiveAddress}) async {
+    final template = ExchangeTemplate(
+        amount: amount,
+        depositCurrency: depositCurrency,
+        receiveCurrency: receiveCurrency,
+        provider: provider,
+        depositAddress: depositAddress,
+        receiveAddress: receiveAddress);
+    await templateSource.add(template);
+  }
+
+  @action
+  Future remove({ExchangeTemplate template}) async => await template.delete();
+}