[Payments] Implements the credit card editor for Desktop UI

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

Index: chrome/browser/ui/views/payments/editor_view_controller.h
diff --git a/chrome/browser/ui/views/payments/editor_view_controller.h b/chrome/browser/ui/views/payments/editor_view_controller.h
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+++ b/chrome/browser/ui/views/payments/editor_view_controller.h
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+// 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_EDITOR_VIEW_CONTROLLER_H_
+#define CHROME_BROWSER_UI_VIEWS_PAYMENTS_EDITOR_VIEW_CONTROLLER_H_
+
+#include <memory>
+#include <unordered_map>
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/string16.h"
+#include "chrome/browser/ui/views/payments/payment_request_sheet_controller.h"
+#include "components/autofill/core/browser/field_types.h"
+#include "ui/views/controls/button/vector_icon_button_delegate.h"
+#include "ui/views/controls/textfield/textfield_controller.h"
+
+namespace views {
+class Textfield;
+class View;
+}  // namespace views
+
+namespace payments {
+
+class PaymentRequest;
+class PaymentRequestDialogView;
+
+// Field definition for an editor field, used to build the UI.
+struct EditorField {
+  enum LengthHint : int { HINT_LONG, HINT_SHORT };
+

[please use gerrit instead, 2017/02/02 20:19:02]

enum class?

[Mathieu, 2017/02/03 02:18:57]

Done.

+  EditorField(autofill::ServerFieldType type,
+              base::string16 label,

[please use gerrit instead, 2017/02/02 20:19:02]

const-ref to avoid an extra copy.

[Mathieu, 2017/02/03 02:18:57]

Done.

+              LengthHint length_hint)
+      : type(type), label(label), length_hint(length_hint) {}
+
+  autofill::ServerFieldType type;

[please use gerrit instead, 2017/02/02 20:19:02]

Here and below: "const" to make this type immutable. (Makes reasoning about it
easier.)

[Mathieu, 2017/02/03 02:18:57]

Done.

+
+  base::string16 label;
+

[please use gerrit instead, 2017/02/02 20:19:02]

nit: No need for newlines on lines 40 and 42.

[Mathieu, 2017/02/03 02:18:57]

Done.

+  LengthHint length_hint;
+};
+
+// The PaymentRequestSheetController subtype for the editor screens of the
+// Payment Request flow.
+class EditorViewController : public PaymentRequestSheetController,
+                             public views::VectorIconButtonDelegate,
+                             public views::TextfieldController {
+ public:
+  // Does not take ownership of the arguments, which should outlive this object.
+  EditorViewController(PaymentRequest* request,
+                       PaymentRequestDialogView* dialog);
+  ~EditorViewController() override;
+
+  // PaymentRequestSheetController:
+  std::unique_ptr<views::View> CreateView() override;
+
+  // Returns the field definitions used to build the UI.
+  virtual std::vector<std::unique_ptr<EditorField>> GetFieldDefinitions() = 0;
+  // Validates the data entered and attempts to save; returns true on success.
+  virtual bool ValidateModelAndSave() = 0;
+
+ private:
+  // views::VectorIconButtonDelegate:
+  void ButtonPressed(views::Button* sender, const ui::Event& event) override;
+
+  // views::TextfieldController
+  void ContentsChanged(views::Textfield* sender,
+                       const base::string16& new_contents) override;
+
+  // Creates a view for an input field to be added in the editor sheet. |field|
+  // is the field definition, which contains the label and the hint about
+  // the length of the input field.
+  std::unique_ptr<views::View> CreateInputField(EditorField* field,
+                                                views::Textfield** text_field);

[please use gerrit instead, 2017/02/02 20:19:02]

Is |text_field| an output?

[Mathieu, 2017/02/03 02:18:57]

Yes. This is a way for the caller to provide the Textfield* they would like to
see populated (it's kept in a map, later)

+
+  // Used to remember the association between the input field UI element and the
+  // original field definition.
+  std::unordered_map<views::Textfield*, std::unique_ptr<EditorField>>
+      text_fields_;
+
+  DISALLOW_COPY_AND_ASSIGN(EditorViewController);
+};
+
+}  // namespace payments
+
+#endif  // CHROME_BROWSER_UI_VIEWS_PAYMENTS_EDITOR_VIEW_CONTROLLER_H_