[Web Payments] Implement item selection in lists.

chrome/browser/ui/views/payments/payment_request_item_list.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_ITEM_LIST_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_ITEM_LIST_H_
 
 #include <memory>
 #include <vector>
 
 #include "base/macros.h"
 #include "ui/views/controls/button/button.h"
 
 namespace views {
 class ImageView;
 class View;
 }
 
 namespace payments {
 
+class PaymentRequestDialogView;
 class PaymentRequestSpec;
 class PaymentRequestState;
 
 // A control representing a list of selectable items in the PaymentRequest
 // dialog. These lists enforce that only one of their elements be selectable at
 // a time and that "incomplete" items (for example, a credit card with no known
 // expiration date) behave differently when selected. Most of the time, this
 // behavior is to show an editor screen.
 class PaymentRequestItemList {
  public:
@@ skipping 64 matching lines @@
     std::unique_ptr<views::View> item_view_;
     PaymentRequestSpec* spec_;
     PaymentRequestState* state_;
     PaymentRequestItemList* list_;
     std::unique_ptr<views::ImageView> checkmark_;
     bool selected_;
 
     DISALLOW_COPY_AND_ASSIGN(Item);
   };
 
-  PaymentRequestItemList();
+  explicit PaymentRequestItemList(PaymentRequestDialogView* dialog);
   virtual ~PaymentRequestItemList();
 
   // Adds an item to this list. |item->list()| should return this object.
   void AddItem(std::unique_ptr<Item> item);
 
   // Creates and returns the UI representation of this list. It iterates over
   // the items it contains, creates their associated views, and adds them to the
   // hierarchy.
   std::unique_ptr<views::View> CreateListView();
 
-  // Deselects the currently selected item and selects |item| instead.
-  void SelectItem(Item* item);
+  // Deselects the currently selected item and selects |item| instead. If
+  // |go_back| is true, also navigates the dialog back to the previous screen.
+  void SelectItem(Item* item, bool go_back);
 
  private:
   // Unselects the currently selected item. This is private so that the list can
   // use it when selecting a new item while avoiding consumers of this class
   // putting the list in a state where no item is selected.
   void UnselectSelectedItem();
 
   std::vector<std::unique_ptr<Item>> items_;
   Item* selected_item_;
+  PaymentRequestDialogView* dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestItemList);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_ITEM_LIST_H_