CW-526-Add-Trocador-providers-option-in-privacy-settings (#1177)

* Trocador settings page UI

* add trocador providers states

* add settings icon

* minor fix

* Revert "minor fix"

This reverts commit e59d9dfdaf9bd1c13a17ae5012db80a8f973a4d4.

* fixes

* PR fixes

* remove trocador menu icon

lib/src/screens/settings/privacy_page.dart

@@ -90,6 +90,10 @@ class PrivacyPage extends BasePage {
               title: S.current.domain_looks_up,
               handler: (context) => Navigator.of(context).pushNamed(Routes.domainLookupsPage),
             ),
+            SettingsCellWithArrow(
+              title: 'Trocador providers',
+              handler: (context) => Navigator.of(context).pushNamed(Routes.trocadorProvidersPage),
+            ),
           ],
         );
       }),

lib/src/screens/settings/trocador_providers_page.dart

@@ -0,0 +1,37 @@
+import 'package:cake_wallet/exchange/provider/trocador_exchange_provider.dart';
+import 'package:cake_wallet/src/screens/base_page.dart';
+import 'package:cake_wallet/src/screens/settings/widgets/settings_switcher_cell.dart';
+import 'package:cake_wallet/view_model/settings/trocador_providers_view_model.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_mobx/flutter_mobx.dart';
+
+class TrocadorProvidersPage extends BasePage {
+  TrocadorProvidersPage(this.trocadorProvidersViewModel);
+
+  @override
+  String get title => 'Trocador Providers';
+
+  final TrocadorProvidersViewModel trocadorProvidersViewModel;
+
+  @override
+  Widget body(BuildContext context) {
+    final availableProviders = TrocadorExchangeProvider.availableProviders;
+    final providerStates = trocadorProvidersViewModel.providerStates;
+    return Container(
+      padding: EdgeInsets.only(top: 10),
+      child: ListView.builder(
+        itemCount: availableProviders.length,
+        itemBuilder: (_, index) {
+          String provider = availableProviders[index];
+          return Observer(
+              builder: (_) => SettingsSwitcherCell(
+                  title: provider,
+                  value: providerStates[provider] ?? false,
+                  onValueChange: (BuildContext _, bool value) {
+                    trocadorProvidersViewModel.toggleProviderState(provider);
+                  }));
+        },
+      ),
+    );
+  }
+}