[Payment Request] Refactors the edit view controller

ios/showcase/payments/sc_payments_editor_coordinator.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/showcase/payments/sc_payments_editor_coordinator.h"
 
 #import "base/mac/foundation_util.h"
 #include "base/strings/utf_string_conversions.h"
 #import "ios/chrome/browser/ui/autofill/autofill_ui_type.h"
 #import "ios/chrome/browser/ui/autofill/autofill_ui_type_util.h"
 #import "ios/chrome/browser/ui/autofill/cells/autofill_edit_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/payments/cells/payments_text_item.h"
 #import "ios/chrome/browser/ui/payments/payment_request_edit_view_controller.h"
 #import "ios/chrome/browser/ui/payments/payment_request_editor_field.h"
+#import "ios/showcase/common/protocol_alerter.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 @interface SCPaymentsEditorCoordinator ()<
-    PaymentRequestEditViewControllerDataSource> {
-  PaymentRequestEditViewController* _paymentRequestEditViewController;
-}
+    PaymentRequestEditViewControllerDataSource,
+    PaymentRequestEditViewControllerValidator>
+
+@property(nonatomic, strong)
+    PaymentRequestEditViewController* paymentRequestEditViewController;
+
+@property(nonatomic, strong) ProtocolAlerter* alerter;
+
 @end
 
 @implementation SCPaymentsEditorCoordinator
 
+@synthesize state = _state;
 @synthesize baseViewController = _baseViewController;
+@synthesize paymentRequestEditViewController =
+    _paymentRequestEditViewController;
+@synthesize alerter = _alerter;
 
 - (void)start {
-  _paymentRequestEditViewController = [[PaymentRequestEditViewController alloc]
-      initWithStyle:CollectionViewControllerStyleAppBar];
-  [_paymentRequestEditViewController setTitle:@"Add info"];
-  [_paymentRequestEditViewController setDataSource:self];
-  [_paymentRequestEditViewController loadModel];
-  [self.baseViewController pushViewController:_paymentRequestEditViewController
-                                     animated:YES];
+  self.alerter = [[ProtocolAlerter alloc] initWithProtocols:@[
+    @protocol(PaymentRequestEditViewControllerDelegate)
+  ]];
+  self.alerter.baseViewController = self.baseViewController;
+
+  self.paymentRequestEditViewController =
+      [[PaymentRequestEditViewController alloc]
+          initWithStyle:CollectionViewControllerStyleAppBar];
+  [self.paymentRequestEditViewController setTitle:@"Add info"];
+  [self.paymentRequestEditViewController setDataSource:self];
+  [self.paymentRequestEditViewController
+      setDelegate:reinterpret_cast<
+                      id<PaymentRequestEditViewControllerDelegate>>(
+                      self.alerter)];
+  [self.paymentRequestEditViewController setValidatorDelegate:self];
+  [self.paymentRequestEditViewController loadModel];
+  [self.baseViewController
+      pushViewController:self.paymentRequestEditViewController
+                animated:YES];
 }
 
-
 #pragma mark - PaymentRequestEditViewControllerDataSource
 
 - (NSArray<EditorField*>*)editorFields {
-  return @[
-    [[EditorField alloc] initWithAutofillUIType:AutofillUITypeUnknown
-                                          label:@"Name"
-                                          value:@"John Doe"
-                                       required:YES],
-    [[EditorField alloc] initWithAutofillUIType:AutofillUITypeUnknown
-                                          label:@"Address"
-                                          value:@""
-                                       required:YES],
-    [[EditorField alloc] initWithAutofillUIType:AutofillUITypeUnknown
-                                          label:@"Postal Code"
-                                          value:@""
-                                       required:NO]
-  ];
+  EditorField* name =
+      [[EditorField alloc] initWithAutofillUIType:AutofillUITypeUnknown
+                                        fieldType:EditorFieldTypeTextField
+                                            label:@"Name"
+                                            value:@"John Doe"
+                                         required:YES];
+  EditorField* country =
+      [[EditorField alloc] initWithAutofillUIType:AutofillUITypeUnknown
+                                        fieldType:EditorFieldTypeSelector
+                                            label:@"Country"
+                                            value:@"CAN"
+                                         required:YES];
+  [country setDisplayValue:@"Canada"];
+  EditorField* address =
+      [[EditorField alloc] initWithAutofillUIType:AutofillUITypeUnknown
+                                        fieldType:EditorFieldTypeTextField
+                                            label:@"Address"
+                                            value:@""
+                                         required:YES];
+  EditorField* postalCode =
+      [[EditorField alloc] initWithAutofillUIType:AutofillUITypeUnknown
+                                        fieldType:EditorFieldTypeTextField
+                                            label:@"Postal Code"
+                                            value:@""
+                                         required:NO];
+
+  return @[ name, country, address, postalCode ];
+}
+
+- (CollectionViewItem*)headerItem {
+  return nil;
+}
+
+- (BOOL)shouldHideBackgroundForHeaderItem {
+  return NO;
+}
+
+#pragma mark - PaymentRequestEditViewControllerValidator
+
+- (NSString*)paymentRequestEditViewController:
+                 (PaymentRequestEditViewController*)controller
+                                validateField:(EditorField*)field {
+  if (field.value.length)
+    return nil;
+  else if (field.isRequired)
+    return @"Field is required";
+  else
+    return nil;
 }
 
 @end