[Payment Request] Error message screen

ios/chrome/browser/payments/shipping_option_selection_view_controller.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/chrome/browser/payments/shipping_option_selection_view_controller.h"
 
 #import "base/ios/weak_nsobject.h"
 #include "base/mac/foundation_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/payments/currency_formatter.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/payments/cells/payments_text_item.h"
 #include "ios/chrome/browser/payments/payment_request.h"
+#import "ios/chrome/browser/payments/shipping_option_selection_view_controller_actions.h"
 #import "ios/chrome/browser/ui/autofill/cells/status_item.h"
 #import "ios/chrome/browser/ui/collection_view/cells/MDCCollectionViewCell+Chrome.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"
 #import "ios/third_party/material_components_ios/src/components/Palettes/src/MaterialPalettes.h"
 #import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
 #include "ui/base/l10n/l10n_util.h"
 
-NSString* const kShippingOptionSelectionCollectionViewId =
-    @"kShippingOptionSelectionCollectionViewId";
+NSString* const kShippingOptionSelectionCollectionViewID =
+    @"kShippingOptionSelectionCollectionViewID";
 
 namespace {
 
 const CGFloat kSeparatorEdgeInset = 14;
 
 typedef NS_ENUM(NSInteger, SectionIdentifier) {
   SectionIdentifierShippingOption = kSectionIdentifierEnumZero,
 };
 
 typedef NS_ENUM(NSInteger, ItemType) {
   ItemTypeSpinner = kItemTypeEnumZero,
   ItemTypeMessage,
   ItemTypeShippingOption,  // This is a repeated item type.
 };
 
 }  // namespace
 
-@interface ShippingOptionSelectionViewController () {
+@interface ShippingOptionSelectionViewController ()<
+    ShippingOptionSelectionViewControllerActions> {
   base::WeakNSProtocol<id<ShippingOptionSelectionViewControllerDelegate>>
       _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.
   CollectionViewTextItem* _selectedItem;
 }
 
-// Called when the user presses the return button.
-- (void)onReturn;
-
 @end
 
 @implementation ShippingOptionSelectionViewController
 
 @synthesize isLoading = _isLoading;
 @synthesize errorMessage = _errorMessage;
 
 - (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest {
   DCHECK(paymentRequest);
   if ((self = [super initWithStyle:CollectionViewControllerStyleAppBar])) {
     self.title = l10n_util::GetNSString(
         IDS_IOS_PAYMENT_REQUEST_SHIPPING_OPTION_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 61 matching lines @@
     }
 
     [model addItem:item
         toSectionWithIdentifier:SectionIdentifierShippingOption];
   }
 }
 
 - (void)viewDidLoad {
   [super viewDidLoad];
   self.collectionView.accessibilityIdentifier =
-      kShippingOptionSelectionCollectionViewId;
+      kShippingOptionSelectionCollectionViewID;
 
   // Customize collection view settings.
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;
   self.styler.separatorInset =
       UIEdgeInsetsMake(0, kSeparatorEdgeInset, 0, kSeparatorEdgeInset);
 }
 
 #pragma mark UICollectionViewDataSource
 
 - (UICollectionViewCell*)collectionView:(UICollectionView*)collectionView
@@ skipping 77 matching lines @@
     hidesInkViewAtIndexPath:(NSIndexPath*)indexPath {
   NSInteger type = [self.collectionViewModel itemTypeForIndexPath:indexPath];
   if (type == ItemTypeMessage) {
     return YES;
   } else {
     return NO;
   }
 }
 
 @end