[Payments] Improve the closing of the PR dialog.

chrome/browser/ui/views/payments/payment_request_dialog.cc

-// 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.
-
-#include "chrome/browser/ui/views/payments/payment_request_dialog.h"
-
-#include <utility>
-
-#include "base/logging.h"
-#include "base/memory/ptr_util.h"
-#include "chrome/browser/ui/views/payments/order_summary_view_controller.h"
-#include "chrome/browser/ui/views/payments/payment_method_view_controller.h"
-#include "chrome/browser/ui/views/payments/payment_sheet_view_controller.h"
-#include "chrome/grit/generated_resources.h"
-#include "components/constrained_window/constrained_window_views.h"
-#include "components/payments/payment_request.h"
-#include "content/public/browser/browser_thread.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/views/layout/fill_layout.h"
-
-namespace chrome {
-
-void ShowPaymentRequestDialog(payments::PaymentRequest* request) {
-  payments::PaymentRequestDialog::ShowWebModalPaymentDialog(
-      new payments::PaymentRequestDialog(request, /* no observer */ nullptr),
-      request);
-}
-
-}  // namespace chrome
-
-namespace payments {
-namespace {
-
-// This function creates an instance of a PaymentRequestSheetController
-// subclass of concrete type |Controller|, passing it non-owned pointers to
-// |dialog| and the |request| that initiated that dialog. |map| should be owned
-// by |dialog|.
-template <typename Controller>
-std::unique_ptr<views::View> CreateViewAndInstallController(
-    payments::ControllerMap* map,
-    payments::PaymentRequest* request,
-    payments::PaymentRequestDialog* dialog) {
-  std::unique_ptr<Controller> controller =
-      base::MakeUnique<Controller>(request, dialog);
-  std::unique_ptr<views::View> view = controller->CreateView();
-  (*map)[view.get()] = std::move(controller);
-  return view;
-}
-
-}  // namespace
-
-PaymentRequestDialog::PaymentRequestDialog(
-    PaymentRequest* request,
-    PaymentRequestDialog::ObserverForTest* observer)
-    : request_(request), observer_(observer) {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  SetLayoutManager(new views::FillLayout());
-
-  view_stack_.set_owned_by_client();
-  AddChildView(&view_stack_);
-
-  ShowInitialPaymentSheet();
-}
-
-PaymentRequestDialog::~PaymentRequestDialog() {}
-
-ui::ModalType PaymentRequestDialog::GetModalType() const {
-  return ui::MODAL_TYPE_CHILD;
-}
-
-bool PaymentRequestDialog::Cancel() {
-  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
-  request_->Cancel();
-  return true;
-}
-
-bool PaymentRequestDialog::ShouldShowCloseButton() const {
-  // Don't show the normal close button on the dialog. This is because the
-  // typical dialog header doesn't allow displaying anything other that the
-  // title and the close button. This is insufficient for the PaymentRequest
-  // dialog, which must sometimes show the back arrow next to the title.
-  // Moreover, the title (and back arrow) should animate with the view they're
-  // attached to.
-  return false;
-}
-
-int PaymentRequestDialog::GetDialogButtons() const {
-  // The buttons should animate along with the different dialog sheets since
-  // each sheet presents a different set of buttons. Because of this, hide the
-  // usual dialog buttons.
-  return ui::DIALOG_BUTTON_NONE;
-}
-
-void PaymentRequestDialog::GoBack() {
-  view_stack_.Pop();
-}
-
-void PaymentRequestDialog::ShowOrderSummary() {
-  view_stack_.Push(CreateViewAndInstallController<OrderSummaryViewController>(
-                       &controller_map_, request_, this),
-                   true);
-}
-
-void PaymentRequestDialog::ShowPaymentMethodSheet() {
-    view_stack_.Push(
-        CreateViewAndInstallController<PaymentMethodViewController>(
-            &controller_map_, request_, this),
-        true);
-}
-
-void PaymentRequestDialog::CloseDialog() {
-  GetWidget()->Close();
-}
-
-// static
-void PaymentRequestDialog::ShowWebModalPaymentDialog(
-    PaymentRequestDialog* dialog,
-    PaymentRequest* request) {
-  constrained_window::ShowWebModalDialogViews(dialog, request->web_contents());
-}
-
-void PaymentRequestDialog::ShowInitialPaymentSheet() {
-  view_stack_.Push(CreateViewAndInstallController<PaymentSheetViewController>(
-                       &controller_map_, request_, this),
-                   false);
-  if (observer_)
-    observer_->OnDialogOpened();
-}
-
-gfx::Size PaymentRequestDialog::GetPreferredSize() const {
-  return gfx::Size(450, 450);
-}
-
-void PaymentRequestDialog::ViewHierarchyChanged(
-    const ViewHierarchyChangedDetails& details) {
-  // When a view that is associated with a controller is removed from this
-  // view's descendants, dispose of the controller.
-  if (!details.is_add &&
-      controller_map_.find(details.child) != controller_map_.end()) {
-    DCHECK(!details.move_view);
-    controller_map_.erase(details.child);
-  }
-}
-
-}  // namespace payments