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..cc646ad46dd3f1663f3a013351de5c5fbc3a457a
--- /dev/null
+++ b/ash/system/logout_button/logout_confirmation_dialog_view.cc
@@ -0,0 +1,162 @@
+// 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 "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 "grit/ui_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/controls/label.h"
+#include "ui/views/layout/fill_layout.h"
+#include "ui/views/layout/layout_constants.h"
+#include "ui/views/widget/widget.h"
+
+namespace {
+
+const int kCountdownUpdateIntervalMs = 1000; // 1 second.
+
+}  // namespace
+
+namespace ash {
+namespace internal {
+
+LogoutConfirmationSettingsProvider*
+    LogoutConfirmationDialogView::provider_ = NULL;
+
+LogoutConfirmationSettingsProvider::LogoutConfirmationSettingsProvider() {
+}
+
+LogoutConfirmationSettingsProvider::~LogoutConfirmationSettingsProvider() {
+}
+
+void LogoutConfirmationSettingsProvider::LogoutCurrentUser(
+    LogoutConfirmationDialogView* dialog) {
+  if (dialog)
+    dialog->GetWidget()->Close();

[bartfab (slow), 2013/12/03 19:46:04]

Nit: Can the dialog not just call GetWidget()->Close() itself? Then you could
remove the |dialog| argument altogether.

I know that in tests, you call DeleteDelegate() instead. However, that simply
translates into delete dialog and can easily be done explicitly in tests (best
with a scoped_ptr). You would then only have to make sure that either
GetWidget()->Close() is also valid to do in tests or make it conditional, e.g.:

if (GetWidget())
  GetWidget()->close()

This way, the code will not run in tests.

[binjin, 2013/12/05 10:08:05]

I'm not sure I understand, it's the dialog it self I want ensure closed(then I
can verify if the dialog is showing easily).

I think the |dialog| argument is necessary since there is a situation to logout
without an existing LogoutConfirmationDialogView(ButtonPressed() with zero
dialog duration preference). In this situation I can simply pass NULL to
LogoutCurrentUser().

[bartfab (slow), 2013/12/06 13:50:04]

What I meant is this: The LogoutCurrentUser() call can come from two places. In
one place, there is no dialog and there is no need to call Close(). In the other
place (when the call comes from the dialog), the dialog exists and Close() has
to be called. my suggestion was to remove the |dialog| argument here and do the
following instead:

* In the first case, where there is no dialog, do nothing special. Just call
LogoutCurrentUser().
* In the second case, where the dialog wants to close itself and log out, the
dialog would call two things:
GetWidget()->Close();
LogoutCurrentUser();

[binjin, 2013/12/09 18:50:02]

Done.

+  if (Shell::HasInstance())
+    Shell::GetInstance()->system_tray_delegate()->SignOut();
+}
+
+base::TimeTicks LogoutConfirmationSettingsProvider::GetCurrentTime() {
+  return base::TimeTicks::Now();
+}
+
+base::TimeDelta LogoutConfirmationSettingsProvider::GetUpdateInterval() {
+  return base::TimeDelta::FromMilliseconds(kCountdownUpdateIntervalMs);
+}
+
+LogoutConfirmationDialogView::LogoutConfirmationDialogView(
+    base::WeakPtr<LogoutButtonTray> owner) : owner_(owner) {
+  if (!provider_) {
+    provider_ = new LogoutConfirmationSettingsProvider;
+  }
+
+  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() {
+}
+
+void LogoutConfirmationDialogView::DeleteDelegate() {
+  if (owner_) {
+    owner_->DeleteConfirmationDialog();
+  }
+}
+
+bool LogoutConfirmationDialogView::Accept() {
+  provider_->LogoutCurrentUser(this);
+  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::Show(base::TimeDelta duration) {
+  countdown_start_time_ = provider_->GetCurrentTime();
+  duration_ = duration;
+
+  UpdateCountdown();
+
+  // For testint purpose, only run the 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,
+               provider_->GetUpdateInterval(),
+               this,
+               &LogoutConfirmationDialogView::UpdateCountdown);
+}
+
+void LogoutConfirmationDialogView::UpdateDialogDuration(
+    base::TimeDelta duration) {
+  duration_ = duration;
+  UpdateCountdown();
+}
+
+void LogoutConfirmationDialogView::SetProvider(
+    LogoutConfirmationSettingsProvider* provider) {
+  provider_ = provider;
+}
+
+LogoutConfirmationSettingsProvider*
+LogoutConfirmationDialogView::GetProvider() {
+  return provider_;
+}
+
+void LogoutConfirmationDialogView::UpdateCountdown() {
+  const base::TimeDelta time_remaining = countdown_start_time_
+      + duration_ - provider_->GetCurrentTime();
+  // Round the remaining time to nearest second, and use this value for
+  // the count down display.
+  int seconds_remaining = (time_remaining
+      + base::TimeDelta::FromMilliseconds(500)).InSeconds();
+  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();
+    provider_->LogoutCurrentUser(this);
+  }
+}
+
+}  // namespace internal
+}  // namespace ash