[Payment Request] Refactors the remaining selector view controllers

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"
-
-#include "base/mac/foundation_util.h"
-#include "base/strings/sys_string_conversions.h"
-#include "base/strings/utf_string_conversions.h"
-#include "components/payments/core/currency_formatter.h"
-#include "components/payments/core/strings_util.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/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 "ios/web/public/payments/payment_request.h"
-#include "ui/base/l10n/l10n_util.h"
-
-#if !defined(__has_feature) || !__has_feature(objc_arc)
-#error "This file requires ARC support."
-#endif
-
-namespace {
-using ::payments::GetShippingOptionSectionString;
-
-NSString* const kShippingOptionSelectionCollectionViewID =
-    @"kShippingOptionSelectionCollectionViewID";
-
-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 ()<
-    ShippingOptionSelectionViewControllerActions> {
-  // The PaymentRequest object having a copy 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.
-  PaymentsTextItem* _selectedItem;
-}
-
-@end
-
-@implementation ShippingOptionSelectionViewController
-
-@synthesize pending = _pending;
-@synthesize errorMessage = _errorMessage;
-@synthesize delegate = _delegate;
-
-- (instancetype)initWithPaymentRequest:(PaymentRequest*)paymentRequest {
-  DCHECK(paymentRequest);
-  if ((self = [super initWithStyle:CollectionViewControllerStyleAppBar])) {
-    self.title = base::SysUTF16ToNSString(
-        GetShippingOptionSectionString(paymentRequest->shipping_type()));
-
-    // 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;
-}
-
-- (void)onReturn {
-  [_delegate shippingOptionSelectionViewControllerDidReturn:self];
-}
-
-#pragma mark - CollectionViewController methods
-
-- (void)loadModel {
-  [super loadModel];
-  CollectionViewModel* model = self.collectionViewModel;
-  _selectedItem = nil;
-
-  [model addSectionWithIdentifier:SectionIdentifierShippingOption];
-
-  if (self.pending) {
-    StatusItem* statusItem = [[StatusItem alloc] initWithType:ItemTypeSpinner];
-    statusItem.text = l10n_util::GetNSString(IDS_PAYMENTS_CHECKING_OPTION);
-    [model addItem:statusItem
-        toSectionWithIdentifier:SectionIdentifierShippingOption];
-    return;
-  }
-
-  if (_errorMessage) {
-    PaymentsTextItem* messageItem =
-        [[PaymentsTextItem alloc] initWithType:ItemTypeMessage];
-    messageItem.text = _errorMessage;
-    messageItem.image = NativeImage(IDR_IOS_PAYMENTS_WARNING);
-    [model addItem:messageItem
-        toSectionWithIdentifier:SectionIdentifierShippingOption];
-  }
-
-  for (const auto* shippingOption : _paymentRequest->shipping_options()) {
-    PaymentsTextItem* item =
-        [[PaymentsTextItem alloc] initWithType:ItemTypeShippingOption];
-    item.text = base::SysUTF16ToNSString(shippingOption->label);
-    payments::CurrencyFormatter* currencyFormatter =
-        _paymentRequest->GetOrCreateCurrencyFormatter();
-    item.detailText = SysUTF16ToNSString(currencyFormatter->Format(
-        base::UTF16ToASCII(shippingOption->amount.value)));
-
-    if (_paymentRequest->selected_shipping_option() == shippingOption) {
-      item.accessoryType = MDCCollectionViewCellAccessoryCheckmark;
-      _selectedItem = item;
-    }
-
-    [model addItem:item
-        toSectionWithIdentifier:SectionIdentifierShippingOption];
-  }
-}
-
-- (void)viewDidLoad {
-  [super viewDidLoad];
-  self.collectionView.accessibilityIdentifier =
-      kShippingOptionSelectionCollectionViewID;
-
-  // Customize collection view settings.
-  self.styler.cellStyle = MDCCollectionViewCellStyleCard;
-  self.styler.separatorInset =
-      UIEdgeInsetsMake(0, kSeparatorEdgeInset, 0, kSeparatorEdgeInset);
-}
-
-#pragma mark UICollectionViewDelegate
-
-- (void)collectionView:(UICollectionView*)collectionView
-    didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
-  [super collectionView:collectionView didSelectItemAtIndexPath:indexPath];
-
-  CollectionViewModel* model = self.collectionViewModel;
-
-  CollectionViewItem* item = [model itemAtIndexPath:indexPath];
-  if (item.type == ItemTypeShippingOption) {
-    // Update the currently selected cell, if any.
-    if (_selectedItem) {
-      _selectedItem.accessoryType = MDCCollectionViewCellAccessoryNone;
-      [self reconfigureCellsForItems:@[ _selectedItem ]
-             inSectionWithIdentifier:SectionIdentifierShippingOption];
-    }
-
-    // Update the newly selected cell.
-    PaymentsTextItem* newlySelectedItem =
-        base::mac::ObjCCastStrict<PaymentsTextItem>(item);
-    newlySelectedItem.accessoryType = MDCCollectionViewCellAccessoryCheckmark;
-    [self reconfigureCellsForItems:@[ newlySelectedItem ]
-           inSectionWithIdentifier:SectionIdentifierShippingOption];
-
-    // Update the reference to the selected item.
-    _selectedItem = newlySelectedItem;
-
-    // Notify the delegate of the selection.
-    NSInteger index = [model indexInItemTypeForIndexPath:indexPath];
-    DCHECK(index < (NSInteger)_paymentRequest->shipping_options().size());
-    [_delegate
-        shippingOptionSelectionViewController:self
-                      didSelectShippingOption:_paymentRequest
-                                                  ->shipping_options()[index]];
-  }
-}
-
-#pragma mark MDCCollectionViewStylingDelegate
-
-- (CGFloat)collectionView:(UICollectionView*)collectionView
-    cellHeightAtIndexPath:(NSIndexPath*)indexPath {
-  CollectionViewItem* item =
-      [self.collectionViewModel itemAtIndexPath:indexPath];
-  switch (item.type) {
-    case ItemTypeMessage:
-    case ItemTypeSpinner:
-      return [MDCCollectionViewCell
-          cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds)
-                             forItem:item];
-    case ItemTypeShippingOption:
-      return MDCCellDefaultTwoLineHeight;
-    default:
-      NOTREACHED();
-      return MDCCellDefaultOneLineHeight;
-  }
-}
-
-- (BOOL)collectionView:(UICollectionView*)collectionView
-    hidesInkViewAtIndexPath:(NSIndexPath*)indexPath {
-  NSInteger type = [self.collectionViewModel itemTypeForIndexPath:indexPath];
-  if (type == ItemTypeMessage) {
-    return YES;
-  } else {
-    return NO;
-  }
-}
-
-@end