[Payment Request] Updates AutofillEditItem to reuse in Payment Request

ios/chrome/browser/ui/settings/autofill_credit_card_edit_collection_view_controller.mm

Index: ios/chrome/browser/ui/settings/autofill_credit_card_edit_collection_view_controller.mm
diff --git a/ios/chrome/browser/ui/settings/autofill_credit_card_edit_collection_view_controller.mm b/ios/chrome/browser/ui/settings/autofill_credit_card_edit_collection_view_controller.mm
index a7ed56ce5f59ea516f122e0646eec9e31390efb0..3c4ad8ab1cada4e4e68dce592c42ffa72541bbae 100644
--- a/ios/chrome/browser/ui/settings/autofill_credit_card_edit_collection_view_controller.mm
+++ b/ios/chrome/browser/ui/settings/autofill_credit_card_edit_collection_view_controller.mm
@@ -11,6 +11,7 @@
 #include "base/mac/scoped_block.h"
 #import "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/autofill/core/browser/field_types.h"
 #include "components/autofill/core/browser/payments/payments_service_url.h"
@@ -22,6 +23,7 @@
 #import "ios/chrome/browser/ui/commands/UIKit+ChromeExecuteCommand.h"
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/commands/open_url_command.h"
+#import "ios/chrome/browser/ui/settings/autofill_edit_collection_view_controller+protected.h"
 #import "ios/chrome/browser/ui/settings/cells/autofill_edit_item.h"
 #import "ios/chrome/browser/ui/settings/cells/copied_to_chrome_item.h"
 #import "ios/chrome/browser/ui/uikit_ui_util.h"
@@ -35,6 +37,8 @@ namespace {
 NSString* const kAutofillCreditCardEditCollectionViewId =
     @"kAutofillCreditCardEditCollectionViewId";
 
+const CGFloat kCardTypeIconDimension = 30.0;
+
 typedef NS_ENUM(NSInteger, SectionIdentifier) {
   SectionIdentifierFields = kSectionIdentifierEnumZero,
   SectionIdentifierCopiedToChrome,
@@ -156,6 +160,7 @@ typedef NS_ENUM(NSInteger, ItemType) {
           : base::SysUTF16ToNSString(_creditCard.LastFourDigits());
   cardNumberitem.textFieldEnabled = isEditing;
   cardNumberitem.autofillType = autofill::CREDIT_CARD_NUMBER;
+  [self setCardTypeIconForItem:cardNumberitem];
   [model addItem:cardNumberitem
       toSectionWithIdentifier:SectionIdentifierFields];
 
@@ -193,6 +198,26 @@ typedef NS_ENUM(NSInteger, ItemType) {
   }
 }
 
+#pragma mark - UITextFieldDelegate
+
+- (void)textFieldDidEndEditing:(UITextField*)textField {

[Mathieu, 2017/03/06 20:14:06]

On other platforms I'm pretty sure we show the icon as soon as it's available
(i.e. this would be called at every keystroke). This way, if you enter "4" we
can already tell it's a VISA which is nice. 

Unless I'm wrong this will only be called when the user is done with the field. 

Could
https://developer.apple.com/reference/uikit/uitextfielddelegate/1619599-textf...
work instead?

+  NSIndexPath* cellPath = [self indexPathForCurrentTextField];
+  DCHECK(cellPath);
+  NSIndexPath* itemPath = [NSIndexPath indexPathForItem:[cellPath row]
+                                              inSection:[cellPath section]];
+  AutofillEditItem* item = base::mac::ObjCCastStrict<AutofillEditItem>(
+      [self.collectionViewModel itemAtIndexPath:itemPath]);
+
+  if (item.autofillType == autofill::CREDIT_CARD_NUMBER)
+    [self setCardTypeIconForItem:item];
+
+  // Update the cell.
+  [self reconfigureCellsForItems:@[ item ]
+         inSectionWithIdentifier:SectionIdentifierFields];
+
+  [super textFieldDidEndEditing:textField];
+}
+
 #pragma mark - MDCCollectionViewEditingDelegate
 
 - (BOOL)collectionViewAllowsEditing:(UICollectionView*)collectionView {
@@ -270,4 +295,22 @@ typedef NS_ENUM(NSInteger, ItemType) {
   [self reloadData];
 }
 
+#pragma mark - Helper Methods
+
+- (void)setCardTypeIconForItem:(AutofillEditItem*)item {
+  const char* cardType = autofill::CreditCard::GetCreditCardType(
+      base::SysNSStringToUTF16(item.textFieldValue));
+  if (cardType != autofill::kGenericCard) {
+    int resourceID =
+        autofill::data_util::GetPaymentRequestData(cardType).icon_resource_id;
+    // Resize and set the card type icon.
+    CGFloat dimension = kCardTypeIconDimension;
+    item.cardTypeIcon =
+        ResizeImage(NativeImage(resourceID), CGSizeMake(dimension, dimension),
+                    ProjectionMode::kAspectFillNoClipping);
+  } else {
+    item.cardTypeIcon = nil;
+  }
+}
+
 @end