Implements the dialog view for logout button tray in public sessions.

ash/system/logout_button/logout_confirmation_dialog_view.cc

Index: ash/system/logout_button/logout_confirmation_dialog_view.cc
diff --git a/ash/system/logout_button/logout_confirmation_dialog_view.cc b/ash/system/logout_button/logout_confirmation_dialog_view.cc
new file mode 100644
index 0000000000000000000000000000000000000000..aed329bf34ead00e4a37687450d50e84c3a565eb
--- /dev/null
+++ b/ash/system/logout_button/logout_confirmation_dialog_view.cc
@@ -0,0 +1,159 @@
+// Copyright (c) 2013 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 "ash/system/logout_button/logout_confirmation_dialog_view.h"
+
+#include <cmath>
+
+#include "ash/shell.h"
+#include "ash/system/logout_button/logout_button_tray.h"
+#include "ash/system/tray/system_tray_delegate.h"
+#include "ash/system/tray/tray_constants.h"
+#include "base/location.h"
+#include "grit/ash_strings.h"
+#include "ui/aura/root_window.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/l10n/time_format.h"
+#include "ui/base/ui_base_types.h"
+#include "ui/gfx/text_constants.h"
+#include "ui/views/border.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/layout/fill_layout.h"
+#include "ui/views/widget/widget.h"
+
+namespace ash {
+namespace internal {
+
+namespace {
+  const int kCountdownUpdateIntervalMs = 1000;  // 1 second.

[bartfab (slow), 2013/12/18 18:26:49]

Nit: Style guide: Constants like this one should not be indented.

[binjin, 2013/12/18 18:42:14]

Done.

+}  // namespace
+
+LogoutConfirmationDialogView::Delegate::Delegate() {
+}
+
+LogoutConfirmationDialogView::Delegate::~Delegate() {
+}
+
+void LogoutConfirmationDialogView::Delegate::LogoutCurrentUser() {
+  DCHECK(Shell::GetInstance() != NULL);

[bartfab (slow), 2013/12/18 18:26:49]

Nit 1: No need for != NULL. DCHECK(Shell::GetInstance()) will do.
Nit 2: DCHECK(Shell::HasInstance()) may be more elegant.
Nit 3: #include "base/logging.h"
Nit 4: There is no real need for this DCHECK. In production code, the shell
always exists.

[binjin, 2013/12/18 18:42:14]

Done.

+  Shell::GetInstance()->system_tray_delegate()->SignOut();
+}
+
+base::TimeTicks LogoutConfirmationDialogView::Delegate::GetCurrentTime() const {
+  return base::TimeTicks::Now();
+}
+
+LogoutConfirmationDialogView::LogoutConfirmationDialogView(
+    LogoutButtonTray* owner, Delegate* delegate) : owner_(owner),
+                                                   delegate_(delegate) {
+  text_label_ = new views::Label;
+  text_label_->set_border(
+      views::Border::CreateEmptyBorder(0, kTrayPopupPaddingHorizontal,
+                                       0, kTrayPopupPaddingHorizontal));
+  text_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  text_label_->SetMultiLine(true);
+
+  SetLayoutManager(new views::FillLayout());
+
+  AddChildView(text_label_);
+}
+
+LogoutConfirmationDialogView::~LogoutConfirmationDialogView() {
+}
+
+bool LogoutConfirmationDialogView::Accept() {
+  LogoutCurrentUser();
+  return true;
+}
+
+ui::ModalType LogoutConfirmationDialogView::GetModalType() const {
+  return ui::MODAL_TYPE_SYSTEM;
+}
+
+string16 LogoutConfirmationDialogView::GetWindowTitle() const {
+  return l10n_util::GetStringUTF16(IDS_ASH_LOGOUT_CONFIRMATION_TITLE);
+}
+
+string16 LogoutConfirmationDialogView::GetDialogButtonLabel(
+    ui::DialogButton button) const {
+  if (button == ui::DIALOG_BUTTON_OK)
+    return l10n_util::GetStringUTF16(IDS_ASH_LOGOUT_CONFIRMATION_BUTTON);
+  return views::DialogDelegateView::GetDialogButtonLabel(button);
+}
+
+void LogoutConfirmationDialogView::OnClosed() {
+  DCHECK(owner_ != NULL);

[bartfab (slow), 2013/12/18 18:26:49]

Nit 1: No need for != NULL. DCHECK(owner_) will do.
Nit 2: #include "base/logging.h"
Nit 3: There is no real need for this DCHECK. If owner_ really is NULL, we will
crash a line later anyway.

[binjin, 2013/12/18 18:42:14]

Done.

+  owner_->ReleaseConfirmationDialog();
+  owner_ = NULL;
+  timer_.Stop();
+  // Nullify the delegate to prevent future activities of the dialog.
+  delegate_ = NULL;
+}
+
+void LogoutConfirmationDialogView::DeleteDelegate() {
+  if (owner_)
+    owner_->ReleaseConfirmationDialog();
+  delete this;
+}
+
+void LogoutConfirmationDialogView::Show(base::TimeDelta duration) {
+  if (!delegate_)
+    return;
+  countdown_start_time_ = delegate_->GetCurrentTime();
+  duration_ = duration;
+
+  UpdateCountdown();
+
+  // For testing purpose, only actually display the dialog if an existing
+  // ash::Shell is available.
+  if (ash::Shell::HasInstance()) {
+    views::DialogDelegate::CreateDialogWidget(
+        this, ash::Shell::GetPrimaryRootWindow(), NULL);
+    GetWidget()->Show();
+  }
+
+  timer_.Start(FROM_HERE,
+               base::TimeDelta::FromMicroseconds(kCountdownUpdateIntervalMs),

[bartfab (slow), 2013/12/18 18:26:49]

FromMilliseconds, not FromMicroseconds.

[binjin, 2013/12/18 18:42:14]

Done.

+               this,
+               &LogoutConfirmationDialogView::UpdateCountdown);
+}
+
+void LogoutConfirmationDialogView::UpdateDialogDuration(
+    base::TimeDelta duration) {
+  duration_ = duration;
+  UpdateCountdown();
+}
+
+void LogoutConfirmationDialogView::LogoutCurrentUser() {
+  if (!delegate_)
+    return;
+  delegate_->LogoutCurrentUser();
+  // For testing purpose, simulate closing of all windows during session logout.
+  if (!ash::Shell::HasInstance())

[bartfab (slow), 2013/12/18 18:26:49]

This should be done in the testing code (in the MockDelegate), not inside the
production class.

[binjin, 2013/12/18 18:42:14]

Done.

+    OnClosed();
+}
+
+void LogoutConfirmationDialogView::UpdateCountdown() {
+  if (!delegate_)
+    return;
+  const base::TimeDelta time_remaining = countdown_start_time_ +
+      duration_ - delegate_->GetCurrentTime();
+  // Round the remaining time to nearest second, and use this value for
+  // the countdown display and actual enforcement.
+  int seconds_remaining = round(time_remaining.InSecondsF());
+  if (seconds_remaining > 0) {
+    text_label_->SetText(l10n_util::GetStringFUTF16(
+        IDS_ASH_LOGOUT_CONFIRMATION_WARNING,
+        ui::TimeFormat::TimeDurationLong(base::TimeDelta::FromSeconds(
+            seconds_remaining))));
+  } else {
+    text_label_->SetText(l10n_util::GetStringUTF16(
+        IDS_ASH_LOGOUT_CONFIRMATION_WARNING_NOW));
+    timer_.Stop();
+    LogoutCurrentUser();
+  }
+}
+
+}  // namespace internal
+}  // namespace ash