Selected shipping option in payment summary view + shipping option selection view

ios/chrome/browser/payments/shipping_option_selection_coordinator.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_coordinator.h"
+
+#import "base/ios/weak_nsobject.h"
+#include "base/mac/scoped_nsobject.h"
+#import "ios/chrome/browser/payments/shipping_option_selection_view_controller.h"
+
+@interface ShippingOptionSelectionCoordinator ()<
+    ShippingOptionSelectionViewControllerDelegate> {
+  base::WeakNSProtocol<id<ShippingOptionSelectionCoordinatorDelegate>>
+      _delegate;
+  base::scoped_nsobject<ShippingOptionSelectionViewController> _viewController;
+}
+
+// Called when the user selects a shipping option. The cell is checked, the
+// UI is locked so that the user can't interact with it, then the delegate is
+// notified. The delay is here to let the user get a visual feedback of the
+// selection before this view disappears.
+- (void)delayedNotifyDelegateOfSelection;
+
+@end
+
+@implementation ShippingOptionSelectionCoordinator
+
+@synthesize shippingOptions = _shippingOptions;
+@synthesize selectedShippingOption = _selectedShippingOption;
+
+- (id<ShippingOptionSelectionCoordinatorDelegate>)delegate {
+  return _delegate.get();
+}
+
+- (void)setDelegate:(id<ShippingOptionSelectionCoordinatorDelegate>)delegate {
+  _delegate.reset(delegate);
+}
+
+- (void)start {
+  _viewController.reset([[ShippingOptionSelectionViewController alloc] init]);
+  [_viewController setShippingOptions:_shippingOptions];
+  [_viewController setSelectedShippingOption:_selectedShippingOption];
+  [_viewController setDelegate:self];
+  [_viewController loadModel];
+
+  DCHECK(self.baseViewController.navigationController);
+  [self.baseViewController.navigationController
+      pushViewController:_viewController
+                animated:YES];
+}
+
+- (void)stop {
+  [self.baseViewController.navigationController popViewControllerAnimated:YES];
+  _viewController.reset();
+}
+
+#pragma mark - ShippingOptionSelectionViewControllerDelegate
+
+- (void)shippingOptionSelectionViewController:
+            (ShippingOptionSelectionViewController*)controller
+                       selectedShippingOption:
+                           (web::PaymentShippingOption*)shippingOption {
+  _selectedShippingOption = shippingOption;
+  [self delayedNotifyDelegateOfSelection];
+}
+
+- (void)shippingOptionSelectionViewControllerDidReturn:
+    (ShippingOptionSelectionViewController*)controller {
+  [_delegate shippingOptionSelectionCoordinatorDidReturn:self];
+}
+
+- (void)delayedNotifyDelegateOfSelection {
+  _viewController.get().view.userInteractionEnabled = NO;
+  base::WeakNSObject<ShippingOptionSelectionCoordinator> weakSelf(self);
+  dispatch_after(
+      dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.2 * NSEC_PER_SEC)),
+      dispatch_get_main_queue(), ^{
+        base::scoped_nsobject<ShippingOptionSelectionCoordinator> strongSelf(
+            [weakSelf retain]);
+        // Early return if the coordinator has been deallocated.
+        if (!strongSelf)
+          return;
+
+        _viewController.get().view.userInteractionEnabled = YES;
+        [_delegate shippingOptionSelectionCoordinator:self
+                               selectedShippingOption:_selectedShippingOption];
+      });
+}
+
+@end