Multiprofile security: Show a warning messagebox when desktop casting/sharing is turned on upon user

ash/system/chromeos/multi_user/try_switching_user.cc

+// Copyright 2014 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/chromeos/multi_user/try_switching_user.h"
+
+#include "ash/shell.h"
+#include "ash/system/chromeos/screen_security/screen_tray_item.h"
+#include "ash/system/tray/system_tray.h"
+#include "grit/ash_strings.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/views/controls/label.h"
+#include "ui/views/layout/grid_layout.h"
+#include "ui/views/widget/widget.h"
+#include "ui/views/window/dialog_delegate.h"
+
+namespace ash {
+
+namespace {
+
+// Default width/height of the dialog.
+const int kDefaultWidth = 500;
+const int kDefaultHeight = 150;
+
+const int kPaddingToMessage = 30;
+const int kInset = 40;
+const int kTopInset = 10;
+
+////////////////////////////////////////////////////////////////////////////////
+// Dialog for multi-profiles desktop casting warning.
+class DesktopCastingWarningView : public views::DialogDelegateView {
+ public:
+  DesktopCastingWarningView(base::Callback<void()> on_accept);
+  virtual ~DesktopCastingWarningView();
+
+  static void ShowDialog(const base::Callback<void()> on_accept);
+
+  // views::DialogDelegate overrides.
+  virtual bool Accept() OVERRIDE;
+  virtual base::string16 GetDialogButtonLabel(
+        ui::DialogButton button) const OVERRIDE;
+  virtual bool IsDialogButtonEnabled(ui::DialogButton button) const OVERRIDE;
+  virtual int GetDefaultDialogButton() const OVERRIDE;
+
+  // views::WidgetDelegate overrides.
+  virtual ui::ModalType GetModalType() const OVERRIDE;
+
+  // views::View overrides.
+  virtual gfx::Size GetPreferredSize() const OVERRIDE;
+
+ private:
+  void InitDialog();
+
+  const base::Callback<void()> on_switch_;
+
+  DISALLOW_COPY_AND_ASSIGN(DesktopCastingWarningView);
+};
+
+// The current instance of the running dialog - or NULL. This is used for
+// unittest related functions.
+static DesktopCastingWarningView* instance_for_test;
+
+////////////////////////////////////////////////////////////////////////////////
+// DesktopCastingWarningView implementation.
+
+DesktopCastingWarningView::DesktopCastingWarningView(
+    const base::Callback<void()> on_switch)
+    : on_switch_(on_switch) {
+  DCHECK(!instance_for_test);
+  instance_for_test = this;
+}
+
+DesktopCastingWarningView::~DesktopCastingWarningView() {
+  DCHECK(instance_for_test);
+  instance_for_test = NULL;
+}
+
+// static
+void DesktopCastingWarningView::ShowDialog(
+    const base::Callback<void()> on_accept) {
+  DesktopCastingWarningView* dialog_view =
+      new DesktopCastingWarningView(on_accept);
+  views::DialogDelegate::CreateDialogWidget(
+      dialog_view, ash::Shell::GetTargetRootWindow(), NULL);
+  dialog_view->InitDialog();
+  views::Widget* widget = dialog_view->GetWidget();
+  DCHECK(widget);
+  widget->Show();
+}
+
+bool DesktopCastingWarningView::Accept() {
+  // Stop screen sharing and capturing.
+  SystemTray* system_tray = ash::Shell::GetInstance()->GetPrimarySystemTray();
+  if (system_tray->GetScreenShareItem()->is_started())
+    system_tray->GetScreenShareItem()->Stop();
+  if (system_tray->GetScreenCaptureItem()->is_started())
+    system_tray->GetScreenCaptureItem()->Stop();
+
+  on_switch_.Run();
+  return true;
+}
+
+base::string16 DesktopCastingWarningView::GetDialogButtonLabel(
+      ui::DialogButton button) const {
+  return l10n_util::GetStringUTF16(
+      button == ui::DIALOG_BUTTON_OK ?
+          IDS_DESKTOP_CASTING_ACTIVE_BUTTON_SWITCH_USER :
+          IDS_DESKTOP_CASTING_ACTIVE_BUTTON_ABORT_USER_SWITCH);
+}
+
+bool DesktopCastingWarningView::IsDialogButtonEnabled(
+    ui::DialogButton button) const {
+  return button == ui::DIALOG_BUTTON_OK || button == ui::DIALOG_BUTTON_CANCEL;
+}
+
+int DesktopCastingWarningView::GetDefaultDialogButton() const {
+  // The default should turn off the casting.
+  return ui::DIALOG_BUTTON_CANCEL;
+}
+
+ui::ModalType DesktopCastingWarningView::GetModalType() const {
+  return ui::MODAL_TYPE_SYSTEM;
+}
+
+gfx::Size DesktopCastingWarningView::GetPreferredSize() const {
+  return gfx::Size(kDefaultWidth, kDefaultHeight);
+}
+
+void DesktopCastingWarningView::InitDialog() {
+  const gfx::Insets kDialogInsets(kTopInset, kInset, kInset, kInset);
+
+  // Create the views and layout manager and set them up.
+  views::GridLayout* grid_layout = views::GridLayout::CreatePanel(this);
+  grid_layout->SetInsets(kDialogInsets);
+
+  views::ColumnSet* column_set = grid_layout->AddColumnSet(0);
+  column_set->AddColumn(views::GridLayout::FILL, views::GridLayout::FILL, 1,
+                        views::GridLayout::USE_PREF, 0, 0);
+
+  // Title
+  views::Label* title_label_ = new views::Label(
+      l10n_util::GetStringUTF16(IDS_DESKTOP_CASTING_ACTIVE_TITLE));
+  title_label_->SetFontList(ui::ResourceBundle::GetSharedInstance().GetFontList(
+      ui::ResourceBundle::MediumBoldFont));
+  title_label_->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  grid_layout->StartRow(0, 0);
+  grid_layout->AddView(title_label_);
+  grid_layout->AddPaddingRow(0, kPaddingToMessage);
+
+  // Explanation string
+  views::Label* label = new views::Label(
+      l10n_util::GetStringUTF16(IDS_DESKTOP_CASTING_ACTIVE_MESSAGE));
+  label->SetFontList(ui::ResourceBundle::GetSharedInstance().GetFontList(
+      ui::ResourceBundle::MediumFont));
+  label->SetMultiLine(true);
+  label->SetHorizontalAlignment(gfx::ALIGN_LEFT);
+  label->SetAllowCharacterBreak(true);
+  grid_layout->StartRow(0, 0);
+  grid_layout->AddView(label);
+
+  SetLayoutManager(grid_layout);
+  Layout();
+}
+
+}  // namespace
+
+////////////////////////////////////////////////////////////////////////////////
+// Factory function.
+
+void TrySwitchingActiveUser(
+   const base::Callback<void()> on_switch) {
+  // If neither screen sharing nor capturing is going on we can immediately
+  // switch users.
+  SystemTray* system_tray = ash::Shell::GetInstance()->GetPrimarySystemTray();
+  if (!system_tray->GetScreenShareItem()->is_started() &&
+      !system_tray->GetScreenCaptureItem()->is_started()) {
+    on_switch.Run();
+    return;
+  }
+  DesktopCastingWarningView::ShowDialog(on_switch);
+}
+
+bool TestAndTerminateDesktopCastingWarningForTest(bool accept) {
+  if (!instance_for_test)
+    return false;
+  if (accept)
+    instance_for_test->Accept();
+  delete instance_for_test->GetWidget()->GetNativeWindow();
+  DCHECK(!instance_for_test);
+  return true;
+}
+
+}  // namespace chromeos