[Payment Request] Selector view controller in showcase

ios/showcase/payments/sc_payments_selector_coordinator.mm

Index: ios/showcase/payments/sc_payments_selector_coordinator.mm
diff --git a/ios/showcase/payments/sc_payments_selector_coordinator.mm b/ios/showcase/payments/sc_payments_selector_coordinator.mm
new file mode 100644
index 0000000000000000000000000000000000000000..f543a7b5719a6ed765ab61181f3133a1cc192e66
--- /dev/null
+++ b/ios/showcase/payments/sc_payments_selector_coordinator.mm
@@ -0,0 +1,109 @@
+// 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/showcase/payments/sc_payments_selector_coordinator.h"
+
+#include "base/logging.h"
+#import "ios/chrome/browser/payments//cells/payments_text_item.h"
+#import "ios/chrome/browser/payments/cells/payments_has_accessory_type.h"
+#import "ios/chrome/browser/payments/payment_request_selector_view_controller.h"
+#import "ios/chrome/browser/payments/payment_request_selector_view_controller_data_source.h"
+#import "ios/chrome/browser/ui/collection_view/collection_view_model.h"
+#import "ios/showcase/common/protocol_alerter.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface SCPaymentsSelectorCoordinator ()<
+    PaymentRequestSelectorViewControllerDataSource>
+
+// Index for the currently selected item or NSUIntegerMax if there is none.
+@property(nonatomic, readwrite) NSUInteger selectedItemIndex;
+
+// The view controller to present.
+@property(nonatomic, strong)
+    PaymentRequestSelectorViewController* selectorViewController;
+
+// The selectable items created and managed by the
+// PaymentRequestSelectorViewControllerDataSource.
+@property(nonatomic, strong)
+    NSArray<CollectionViewItem<PaymentsHasAccessoryType>*>* items;
+
+// The alerter that conforms to PaymentRequestSelectorViewControllerDelegate
+// and displays a UIAlert every time delegate methods are called.
+@property(nonatomic, strong) ProtocolAlerter* alerter;
+
+@end
+
+@implementation SCPaymentsSelectorCoordinator
+
+@synthesize state = _state;
+@synthesize selectedItemIndex = _selectedItemIndex;
+@synthesize baseViewController = _baseViewController;
+@synthesize selectorViewController = _selectorViewController;
+@synthesize items = _items;
+@synthesize alerter = _alerter;
+
+- (void)start {
+  self.items = [self createItems];
+  self.selectedItemIndex = NSUIntegerMax;
+
+  self.alerter = [[ProtocolAlerter alloc] initWithProtocols:@[
+    @protocol(PaymentRequestSelectorViewControllerDelegate)
+  ]];
+  self.alerter.baseViewController = self.baseViewController;
+
+  self.selectorViewController = [[PaymentRequestSelectorViewController alloc]
+      initWithStyle:CollectionViewControllerStyleAppBar];
+  [self.selectorViewController setTitle:@"Select an item"];
+  [self.selectorViewController setDataSource:self];
+  [self.selectorViewController loadModel];
+  [self.selectorViewController
+      setDelegate:reinterpret_cast<
+                      id<PaymentRequestSelectorViewControllerDelegate>>(
+                      self.alerter)];
+  [self.baseViewController pushViewController:self.selectorViewController
+                                     animated:YES];
+}
+
+#pragma mark - PaymentRequestSelectorViewControllerDataSource
+
+- (CollectionViewItem*)headerItem {
+  return [self createItemWithText:@"Header item"];
+}
+
+- (NSArray<CollectionViewItem<PaymentsHasAccessoryType>*>*)selectableItems {
+  return self.items;
+}
+
+- (CollectionViewItem<PaymentsHasAccessoryType>*)selectableItemAtIndex:
+    (NSUInteger)index {
+  DCHECK(index < self.items.count);
+  return [self.items objectAtIndex:index];
+}
+
+- (CollectionViewItem*)addButtonItem {
+  return [self createItemWithText:@"Add an item"];
+}
+
+#pragma mark - Helper methods
+
+- (NSArray<CollectionViewItem<PaymentsHasAccessoryType>*>*)createItems {
+  return @[
+    [self createItemWithText:@"First selectable item"],
+    [self createItemWithText:@"Second selectable item"],
+    [self createItemWithText:@"Third selectable item"],
+    [self createItemWithText:@"Fourth selectable item"]
+  ];
+}
+
+- (CollectionViewItem<PaymentsHasAccessoryType>*)createItemWithText:
+    (NSString*)text {
+  PaymentsTextItem* item = [[PaymentsTextItem alloc] init];
+  item.text = text;
+  return item;
+}
+
+@end