[Payment Request] Refactors edit view controller

ios/chrome/browser/ui/payments/credit_card_edit_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/ui/payments/credit_card_edit_view_controller.h"
-
-#import "base/mac/foundation_util.h"
-#include "base/memory/ptr_util.h"
-#include "components/strings/grit/components_strings.h"
-#import "ios/chrome/browser/ui/autofill/autofill_ui_type.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/collection_view/cells/collection_view_item+collection_view_controller.h"
-#import "ios/chrome/browser/ui/collection_view/cells/collection_view_switch_item.h"
-#import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
-#import "ios/chrome/browser/ui/payments/payment_request_edit_view_controller+internal.h"
-#import "ios/chrome/browser/ui/payments/payment_request_editor_field.h"
-#import "ios/chrome/browser/ui/uikit_ui_util.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 kCreditCardEditCollectionViewId =
-    @"kCreditCardEditCollectionViewId";
-
-typedef NS_ENUM(NSInteger, SectionIdentifier) {
-  SectionIdentifierSaveCard = kSectionIdentifierEnumStart,
-};
-
-typedef NS_ENUM(NSInteger, ItemType) {
-  ItemTypeSaveCard = kItemTypeEnumStart,
-};
-
-}  // namespace
-
-@interface CreditCardEditViewController () {
-  // Indicates whether the credit card being created should be saved locally.
-  BOOL _saveCreditCard;
-}
-
-// The list of field definitions for the editor.
-@property(nonatomic, strong) NSArray<EditorField*>* fields;
-
-@end
-
-@implementation CreditCardEditViewController
-
-@synthesize delegate = _delegate;
-@synthesize dataSource = _dataSource;
-@synthesize fields = _fields;
-
-#pragma mark - Setters
-
-- (void)setDelegate:(id<CreditCardEditViewControllerDelegate>)delegate {
-  [super setDelegate:delegate];
-  _delegate = delegate;
-}
-
-- (void)setDataSource:(id<CreditCardEditViewControllerDataSource>)dataSource {
-  [super setDataSource:dataSource];
-  _dataSource = dataSource;
-}
-
-#pragma mark - PaymentRequestEditViewControllerActions methods
-
-- (void)onCancel {
-  [super onCancel];
-
-  [_delegate creditCardEditViewControllerDidCancel:self];
-}
-
-- (void)onDone {
-  [super onDone];
-
-  if (![self validateForm])
-    return;
-
-  [_delegate creditCardEditViewController:self
-                   didFinishEditingFields:_fields
-                           saveCreditCard:_saveCreditCard];
-}
-
-#pragma mark - CollectionViewController methods
-
-- (void)loadModel {
-  [super loadModel];
-
-  // If editing a credit card, set the card type icon (e.g. "Visa").
-  if (_dataSource.state == EditViewControllerStateEdit) {
-    for (EditorField* field in _fields) {
-      if (field.autofillUIType == AutofillUITypeCreditCardNumber) {
-        AutofillEditItem* item =
-            base::mac::ObjCCastStrict<AutofillEditItem>(field.item);
-        item.identifyingIcon =
-            [_dataSource cardTypeIconFromCardNumber:item.textFieldValue];
-      }
-    }
-  }
-}
-
-- (void)loadFooterItems {
-  CollectionViewModel* model = self.collectionViewModel;
-
-  // "Save card" section. Visible only when creating a card.
-  if (_dataSource.state == EditViewControllerStateCreate) {
-    [model addSectionWithIdentifier:SectionIdentifierSaveCard];
-    CollectionViewSwitchItem* saveCardItem =
-        [[CollectionViewSwitchItem alloc] initWithType:ItemTypeSaveCard];
-    saveCardItem.text =
-        l10n_util::GetNSString(IDS_PAYMENTS_SAVE_CARD_TO_DEVICE_CHECKBOX);
-    saveCardItem.on = YES;
-    [model addItem:saveCardItem
-        toSectionWithIdentifier:SectionIdentifierSaveCard];
-  }
-
-  [super loadFooterItems];
-}
-
-#pragma mark - UITextFieldDelegate
-
-// This method is called as the text is being typed in, pasted, or deleted. Asks
-// the delegate if the text should be changed. Should always return YES. During
-// typing/pasting text, |newText| contains one or more new characters. When user
-// deletes text, |newText| is empty. |range| is the range of characters to be
-// replaced.
-- (BOOL)textField:(UITextField*)textField
-    shouldChangeCharactersInRange:(NSRange)range
-                replacementString:(NSString*)newText {
-  NSIndexPath* indexPath = [self indexPathForCurrentTextField];
-  AutofillEditItem* item = base::mac::ObjCCastStrict<AutofillEditItem>(
-      [self.collectionViewModel itemAtIndexPath:indexPath]);
-
-  // If the user is typing in the credit card number field, update the card type
-  // icon (e.g. "Visa") to reflect the number being typed.
-  if (item.autofillUIType == AutofillUITypeCreditCardNumber) {
-    // Obtain the text being typed.
-    NSString* updatedText =
-        [textField.text stringByReplacingCharactersInRange:range
-                                                withString:newText];
-    item.identifyingIcon = [_dataSource cardTypeIconFromCardNumber:updatedText];
-
-    // Update the cell.
-    [self reconfigureCellsForItems:@[ item ]];
-  }
-
-  return YES;
-}
-
-#pragma mark - UICollectionViewDataSource
-
-- (UICollectionViewCell*)collectionView:(UICollectionView*)collectionView
-                 cellForItemAtIndexPath:(NSIndexPath*)indexPath {
-  UICollectionViewCell* cell =
-      [super collectionView:collectionView cellForItemAtIndexPath:indexPath];
-  CollectionViewItem* item =
-      [self.collectionViewModel itemAtIndexPath:indexPath];
-
-  switch (item.type) {
-    case ItemTypeSaveCard: {
-      CollectionViewSwitchCell* switchCell =
-          base::mac::ObjCCastStrict<CollectionViewSwitchCell>(cell);
-      [switchCell.switchView addTarget:self
-                                action:@selector(saveCardSwitchToggled:)
-                      forControlEvents:UIControlEventValueChanged];
-      break;
-    }
-    default:
-      break;
-  }
-
-  return cell;
-}
-
-#pragma mark MDCCollectionViewStylingDelegate
-
-- (CGFloat)collectionView:(UICollectionView*)collectionView
-    cellHeightAtIndexPath:(NSIndexPath*)indexPath {
-  CollectionViewItem* item =
-      [self.collectionViewModel itemAtIndexPath:indexPath];
-  switch (item.type) {
-    case ItemTypeSaveCard:
-      return [MDCCollectionViewCell
-          cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds)
-                             forItem:item];
-    default:
-      return
-          [super collectionView:collectionView cellHeightAtIndexPath:indexPath];
-  }
-}
-
-- (BOOL)collectionView:(UICollectionView*)collectionView
-    hidesInkViewAtIndexPath:(NSIndexPath*)indexPath {
-  NSInteger type = [self.collectionViewModel itemTypeForIndexPath:indexPath];
-  switch (type) {
-    case ItemTypeSaveCard:
-      return YES;
-    default:
-      return [super collectionView:collectionView
-           hidesInkViewAtIndexPath:indexPath];
-  }
-}
-
-#pragma mark Switch Actions
-
-- (void)saveCardSwitchToggled:(UISwitch*)sender {
-  _saveCreditCard = sender.isOn;
-}
-
-@end