[Payment Request] Error message screen

ios/chrome/browser/payments/payment_request_error_view_controller.mm

+// Copyright 2017 The Chromium Authors. All rights reserved.

[please use gerrit instead, 2017/02/21 16:37:08]

This can be used to get Objective C readability. Is it time?

[Moe, 2017/02/21 22:56:15]

I'd wait a bit longer until I'd stop making obvious memory management mistakes.
I have quite a few CLs with components written from scratch to use for that
purpose :)

+// 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_error_view_controller.h"
+
+#import "base/ios/weak_nsobject.h"
+#include "base/mac/foundation_util.h"
+#include "base/mac/scoped_nsobject.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_error_view_controller_actions.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"
+#include "ios/chrome/grit/ios_strings.h"
+#import "ios/third_party/material_components_ios/src/components/Buttons/src/MaterialButtons.h"
+#include "ui/base/l10n/l10n_util.h"
+
+NSString* const kPaymentRequestErrorCollectionViewID =
+    @"kPaymentRequestErrorCollectionViewID";
+
+namespace {
+
+const CGFloat kSeparatorEdgeInset = 14;
+
+typedef NS_ENUM(NSInteger, SectionIdentifier) {
+  SectionIdentifierMessage = kSectionIdentifierEnumZero,
+};
+
+typedef NS_ENUM(NSInteger, ItemType) {
+  ItemTypeMessage = kItemTypeEnumZero,
+};
+
+}  // namespace
+
+@interface PaymentRequestErrorViewController ()<
+    PaymentRequestErrorViewControllerActions> {
+  base::WeakNSProtocol<id<PaymentRequestErrorViewControllerDelegate>> _delegate;
+  base::scoped_nsobject<UIBarButtonItem> _okButton;
+}
+
+@end
+
+@implementation PaymentRequestErrorViewController
+
+@synthesize errorMessage = _errorMessage;
+
+- (instancetype)init {
+  if ((self = [super initWithStyle:CollectionViewControllerStyleAppBar])) {
+    [self setTitle:l10n_util::GetNSString(IDS_IOS_PAYMENT_REQUEST_TITLE)];
+
+    // Set up trailing (ok) button.
+    _okButton.reset([[UIBarButtonItem alloc]
+        initWithTitle:l10n_util::GetNSString(
+                          IDS_IOS_PAYMENT_REQUEST_ERROR_PAGE_OK_BUTTON)
+                style:UIBarButtonItemStylePlain
+               target:nil
+               action:@selector(onOk)]);
+    [_okButton setTitleTextAttributes:@{
+      NSForegroundColorAttributeName : [UIColor lightGrayColor]
+    }
+                             forState:UIControlStateDisabled];
+    [_okButton setAccessibilityLabel:l10n_util::GetNSString(IDS_ACCNAME_OK)];
+    [self navigationItem].rightBarButtonItem = _okButton;
+  }
+  return self;
+}
+
+- (id<PaymentRequestErrorViewControllerDelegate>)delegate {
+  return _delegate.get();
+}
+
+- (void)setDelegate:(id<PaymentRequestErrorViewControllerDelegate>)delegate {
+  _delegate.reset(delegate);
+}
+
+- (void)onOk {
+  [_delegate paymentRequestErrorViewControllerDidDismiss:self];
+}
+
+#pragma mark - CollectionViewController methods
+
+- (void)loadModel {
+  [super loadModel];
+  CollectionViewModel* model = self.collectionViewModel;
+
+  // Message section.
+  [model addSectionWithIdentifier:SectionIdentifierMessage];
+
+  PaymentsTextItem* messageItem =
+      [[[PaymentsTextItem alloc] initWithType:ItemTypeMessage] autorelease];
+  messageItem.text = _errorMessage;
+  [model addItem:messageItem toSectionWithIdentifier:SectionIdentifierMessage];
+}
+
+- (void)viewDidLoad {
+  [super viewDidLoad];
+  self.collectionView.accessibilityIdentifier =
+      kPaymentRequestErrorCollectionViewID;
+
+  // Customize collection view settings.
+  self.styler.cellStyle = MDCCollectionViewCellStyleCard;
+  self.styler.separatorInset =
+      UIEdgeInsetsMake(0, kSeparatorEdgeInset, 0, kSeparatorEdgeInset);
+}
+
+#pragma mark UICollectionViewDataSource
+
+- (UICollectionViewCell*)collectionView:(UICollectionView*)collectionView
+                 cellForItemAtIndexPath:(nonnull NSIndexPath*)indexPath {
+  UICollectionViewCell* cell =
+      [super collectionView:collectionView cellForItemAtIndexPath:indexPath];
+
+  NSInteger itemType =
+      [self.collectionViewModel itemTypeForIndexPath:indexPath];
+  switch (itemType) {
+    case ItemTypeMessage: {
+      PaymentsTextCell* messageCell =
+          base::mac::ObjCCastStrict<PaymentsTextCell>(cell);
+      messageCell.textLabel.textColor = [[MDCPalette greyPalette] tint600];
+    }
+    default:
+      break;
+  }
+  return cell;
+}
+
+#pragma mark MDCCollectionViewStylingDelegate
+
+- (CGFloat)collectionView:(UICollectionView*)collectionView
+    cellHeightAtIndexPath:(NSIndexPath*)indexPath {
+  CollectionViewItem* item =
+      [self.collectionViewModel itemAtIndexPath:indexPath];
+  switch (item.type) {
+    case ItemTypeMessage:
+      return [MDCCollectionViewCell
+          cr_preferredHeightForWidth:CGRectGetWidth(collectionView.bounds)
+                             forItem:item];
+    default:
+      NOTREACHED();
+      return MDCCellDefaultOneLineHeight;
+  }
+}
+
+@end