[Payment Request] Error message screen

ios/chrome/browser/payments/payment_method_selection_view_controller.mm

 // Copyright 2016 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/chrome/browser/payments/payment_method_selection_view_controller.h"
 
 #import "base/ios/weak_nsobject.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_nsobject.h"
 #include "base/strings/sys_string_conversions.h"
 #include "components/autofill/core/browser/autofill_data_util.h"
 #include "components/autofill/core/browser/credit_card.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/payments/cells/payment_method_item.h"
 #import "ios/chrome/browser/payments/cells/payments_text_item.h"
+#import "ios/chrome/browser/payments/payment_method_selection_view_controller_actions.h"
 #include "ios/chrome/browser/payments/payment_request.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_detail_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_text_item.h"
 #import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
 #import "ios/chrome/browser/ui/colors/MDCPalette+CrAdditions.h"
 #import "ios/chrome/browser/ui/icons/chrome_icon.h"
 #include "ios/chrome/browser/ui/uikit_ui_util.h"
 #include "ios/chrome/grit/ios_strings.h"
 #include "ios/chrome/grit/ios_theme_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/resource/resource_bundle.h"
 
-NSString* const kPaymentMethodSelectionCollectionViewId =
-    @"kPaymentMethodSelectionCollectionViewId";
+NSString* const kPaymentMethodSelectionCollectionViewID =
+    @"kPaymentMethodSelectionCollectionViewID";
 
 namespace {
 
 const CGFloat kSeparatorEdgeInset = 14;
 
 typedef NS_ENUM(NSInteger, SectionIdentifier) {
   SectionIdentifierPayment = kSectionIdentifierEnumZero,
 };
 
 typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypePaymentMethod = kItemTypeEnumZero,  // This is a repeated item type.
   ItemTypeAddMethod,
 };
 
 }  // namespace
 
-@interface PaymentMethodSelectionViewController () {
+@interface PaymentMethodSelectionViewController ()<
+    PaymentMethodSelectionViewControllerActions> {
   base::WeakNSProtocol<id<PaymentMethodSelectionViewControllerDelegate>>
       _delegate;
 
   // The PaymentRequest object owning an instance of web::PaymentRequest as
   // provided by the page invoking the Payment Request API. This is a weak
   // pointer and should outlive this class.
   PaymentRequest* _paymentRequest;
 
   // The currently selected item. May be nil.
   PaymentMethodItem* _selectedItem;
 }
 
-// Called when the user presses the return button.
-- (void)onReturn;
-
 @end
 
 @implementation PaymentMethodSelectionViewController
 
 - (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest {
   DCHECK(paymentRequest);
   if ((self = [super initWithStyle:CollectionViewControllerStyleAppBar])) {
     [self setTitle:l10n_util::GetNSString(
                        IDS_IOS_PAYMENT_REQUEST_METHOD_SELECTION_TITLE)];
 
+    // Set up leading (return) button.
     UIBarButtonItem* returnButton =
         [ChromeIcon templateBarButtonItemWithImage:[ChromeIcon backIcon]
                                             target:nil
                                             action:@selector(onReturn)];
     returnButton.accessibilityLabel = l10n_util::GetNSString(IDS_ACCNAME_BACK);
     [self navigationItem].leftBarButtonItem = returnButton;
 
     _paymentRequest = paymentRequest;
   }
   return self;
@@ skipping 47 matching lines @@
       l10n_util::GetNSString(IDS_IOS_PAYMENT_REQUEST_ADD_METHOD_BUTTON);
   addPaymentMethod.image = NativeImage(IDR_IOS_PAYMENTS_ADD);
   addPaymentMethod.accessibilityTraits |= UIAccessibilityTraitButton;
   [model addItem:addPaymentMethod
       toSectionWithIdentifier:SectionIdentifierPayment];
 }
 
 - (void)viewDidLoad {
   [super viewDidLoad];
   self.collectionView.accessibilityIdentifier =
-      kPaymentMethodSelectionCollectionViewId;
+      kPaymentMethodSelectionCollectionViewID;
 
   // Customize collection view settings.
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;
   self.styler.separatorInset =
       UIEdgeInsetsMake(0, kSeparatorEdgeInset, 0, kSeparatorEdgeInset);
 }
 
 #pragma mark UICollectionViewDelegate
 
 - (void)collectionView:(UICollectionView*)collectionView
@@ skipping 46 matching lines @@
       return [MDCCollectionViewCell
           cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds)
                              forItem:item];
     default:
       NOTREACHED();
       return MDCCellDefaultOneLineHeight;
   }
 }
 
 @end