[Payment Request] Refactors selector view controllers

ios/chrome/browser/payments/payment_request_selector_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/payment_request_selector_view_controller.h"
 
 #include "base/mac/foundation_util.h"
 #include "components/strings/grit/components_strings.h"
 #import "ios/chrome/browser/payments/cells/payments_text_item.h"
 #import "ios/chrome/browser/payments/payment_request_selector_view_controller_actions.h"
 #import "ios/chrome/browser/payments/payment_request_selector_view_controller_data_source.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+collection_view_controller.h"
 #import "ios/chrome/browser/ui/collection_view/cells/collection_view_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/Typography/src/MaterialTypography.h"
 #include "ui/base/l10n/l10n_util.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 namespace {
 
 NSString* const kPaymentRequestSelectorCollectionViewAccessibilityID =
     @"kPaymentRequestSelectorCollectionViewAccessibilityID";
@@ skipping 91 matching lines @@
   [super viewDidLoad];
   self.collectionView.accessibilityIdentifier =
       kPaymentRequestSelectorCollectionViewAccessibilityID;
 
   // Customize collection view settings.
   self.styler.cellStyle = MDCCollectionViewCellStyleCard;
   self.styler.separatorInset =
       UIEdgeInsetsMake(0, kSeparatorEdgeInset, 0, kSeparatorEdgeInset);
 }
 
+#pragma mark UICollectionViewDataSource

[Moe, 2017/04/18 13:58:18]

Hopefully we won't need this once the styler API has baked in.

[gambard, 2017/04/18 14:34:46]

Acknowledged.

+
+- (UICollectionViewCell*)collectionView:(UICollectionView*)collectionView
+                 cellForItemAtIndexPath:(nonnull NSIndexPath*)indexPath {
+  CollectionViewModel* model = self.collectionViewModel;
+
+  UICollectionViewCell* cell =
+      [super collectionView:collectionView cellForItemAtIndexPath:indexPath];
+
+  NSInteger itemType = [model itemTypeForIndexPath:indexPath];
+  switch (itemType) {
+    case ItemTypeHeader: {
+      if ([cell isKindOfClass:[PaymentsTextCell class]]) {
+        PaymentsTextCell* textCell =
+            base::mac::ObjCCastStrict<PaymentsTextCell>(cell);
+        textCell.textLabel.textColor =
+            self.dataSource.state == PaymentRequestSelectorStateError
+                ? [[MDCPalette cr_redPalette] tint600]
+                : [[MDCPalette greyPalette] tint600];
+      }
+      break;
+    }
+    default:
+      break;
+  }
+
+  return cell;
+}
+
 #pragma mark UICollectionViewDelegate
 
 - (void)collectionView:(UICollectionView*)collectionView
     didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
   [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
 
   CollectionViewModel* model = self.collectionViewModel;
 
   CollectionViewItem<PaymentsHasAccessoryType>* item =
       [model itemAtIndexPath:indexPath];
@@ skipping 52 matching lines @@
     hidesInkViewAtIndexPath:(NSIndexPath*)indexPath {
   NSInteger type = [self.collectionViewModel itemTypeForIndexPath:indexPath];
   if (type == ItemTypeHeader) {
     return YES;
   } else {
     return NO;
   }
 }
 
 @end