[Web Payments] Refactor sheet display to allow updating view content

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

 // Copyright 2016 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_SHEET_CONTROLLER_H_
 #define CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_SHEET_CONTROLLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 13 matching lines @@
 // views shown in the PaymentRequestDialog.
 class PaymentRequestSheetController : public views::ButtonListener {
  public:
   // Objects of this class are owned by |dialog|, so it's a non-owned pointer
   // that should be valid throughout this object's lifetime.
   // |state| and |spec| are also not owned by this and are guaranteed to outlive
   // dialog. Neither |state|, |spec| or |dialog| should be null.
   PaymentRequestSheetController(PaymentRequestSpec* spec,
                                 PaymentRequestState* state,
                                 PaymentRequestDialogView* dialog);
-  ~PaymentRequestSheetController() override {}
+  ~PaymentRequestSheetController() override;
 
-  virtual std::unique_ptr<views::View> CreateView() = 0;
+  std::unique_ptr<views::View> CreateView();
 
   PaymentRequestSpec* spec() { return spec_; }
   PaymentRequestState* state() { return state_; }
 
   // The dialog that contains and owns this object.
   // Caller should not take ownership of the result.
   PaymentRequestDialogView* dialog() { return dialog_; }
 
  protected:
+  // Clears the content part of the view represented by this view controller and
+  // calls FillContentView again to re-populate it with updated views.
+  void UpdateContentView();
+
   // Creates and returns the primary action button for this sheet. It's
   // typically a blue button with the "Pay" or "Done" labels. Subclasses may
   // return an empty std::unique_ptr (nullptr) to indicate that no primary
   // button should be displayed. The caller takes ownership of the button but
   // the view is guaranteed to be outlived by the controller so subclasses may
   // retain a raw pointer to the returned button (for example to control its
   // enabled state).
   virtual std::unique_ptr<views::Button> CreatePrimaryButton();
 
+  // Returns whether this sheet should display a back arrow in the header next
+  // to the title.
+  virtual bool ShouldShowHeaderBackArrow();
+
+  // Returns the title to be displayed in this sheet's header.
+  virtual base::string16 GetSheetTitle() = 0;
+
+  // Implemented by subclasses to populate |content_view| with the views that
+  // should be displayed in their content area (between the header and the
+  // footer). This may be called at view creation time as well as anytime
+  // UpdateContentView is called.
+  virtual void FillContentView(views::View* content_view) = 0;
+
   // Creates and returns the view to be displayed next to the "Pay" and "Cancel"
   // buttons. May return an empty std::unique_ptr (nullptr) to indicate that no
   // extra view is to be displayed.The caller takes ownership of the view but
   // the view is guaranteed to be outlived by the controller so subclasses may
   // retain a raw pointer to the returned view (for example to control its
   // enabled state). The horizontal and vertical insets (to the left and bottom
   // borders) is taken care of by the caller, so can be set to 0.
   // +---------------------------+
   // | EXTRA VIEW | PAY | CANCEL |
   // +---------------------------+
   virtual std::unique_ptr<views::View> CreateExtraFooterView();
 
   // views::ButtonListener:
   void ButtonPressed(views::Button* sender, const ui::Event& event) override;
 
+  // Creates the row of button containing the Pay, cancel, and extra buttons.
+  // |controller| is installed as the listener for button events.
+  std::unique_ptr<views::View> CreateFooterView();
+
+ private:
   // Creates a view to be displayed in the PaymentRequestDialog.
   // |header_view| is the view displayed on top of the dialog, containing title,
   // (optional) back button, and close buttons.
   // |content_view| is displayed between |header_view| and the pay/cancel
   // buttons. Also adds the footer, returned by CreateFooterView(), which is
   // clamped to the bottom of the containing view.  The returned view takes
   // ownership of |header_view|, |content_view|, and the footer.
   // +---------------------------+
   // |        HEADER VIEW        |
   // +---------------------------+
   // |          CONTENT          |
   // |           VIEW            |
   // +---------------------------+
   // | EXTRA VIEW | PAY | CANCEL | <-- footer
   // +---------------------------+
-  std::unique_ptr<views::View> CreatePaymentView(
-      std::unique_ptr<views::View> header_view,
-      std::unique_ptr<views::View> content_view);
+  std::unique_ptr<views::View> CreatePaymentView();
 
-  // Creates the row of button containing the Pay, cancel, and extra buttons.
-  // |controller| is installed as the listener for button events.
-  std::unique_ptr<views::View> CreateFooterView();
-
- private:
   // All these are not owned. Will outlive this.
   PaymentRequestSpec* spec_;
   PaymentRequestState* state_;
   PaymentRequestDialogView* dialog_;
 
+  // This view is owned by its encompassing ScrollView.
+  views::View* content_view_;
+
   DISALLOW_COPY_AND_ASSIGN(PaymentRequestSheetController);
 };
 
 }  // namespace payments
 
 #endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_PAYMENT_REQUEST_SHEET_CONTROLLER_H_