Implement cycle window forward/backward by keyboard shortcuts.

ui/aura_shell/shell_unittest.cc

 // Copyright (c) 2011 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 "base/utf_string_conversions.h"
 #include "ui/aura/test/aura_test_base.h"
 #include "ui/aura/window.h"
 #include "ui/aura_shell/shell.h"
 #include "ui/aura_shell/shell_window_ids.h"
 #include "ui/aura_shell/test/aura_shell_test_base.h"
@@ skipping 185 matching lines @@
   aura::Window* modal_container = Shell::GetInstance()->GetContainer(
       aura_shell::internal::kShellWindowId_ModalContainer);
   EXPECT_EQ(modal_container, modal_widget->GetNativeWindow()->parent());
 
   modal_widget->Close();
   lock_modal_widget->Close();
   lock_widget->Close();
   widget->Close();
 }
 
+TEST_F(ShellTest, IsScreenLocked) {
+  views::Widget::InitParams widget_params(
+      views::Widget::InitParams::TYPE_WINDOW);
+
+  // A normal window does not lock the screen.
+  views::Widget* widget = CreateTestWindow(widget_params);
+  widget->Show();
+  EXPECT_FALSE(Shell::GetInstance()->IsScreenLocked());
+  widget->Hide();
+  EXPECT_FALSE(Shell::GetInstance()->IsScreenLocked());
+
+  // A modal window with a normal window as parent does not locks the screen.
+  views::Widget* modal_widget = views::Widget::CreateWindowWithParent(
+      new ModalWindow(), widget->GetNativeView());
+  modal_widget->Show();
+  EXPECT_FALSE(Shell::GetInstance()->IsScreenLocked());
+  modal_widget->Close();
+  EXPECT_FALSE(Shell::GetInstance()->IsScreenLocked());
+  widget->Close();
+
+  // A lock screen window locks the screen.
+  views::Widget* lock_widget = CreateTestWindow(widget_params);
+  aura_shell::Shell::GetInstance()->GetContainer(
+      aura_shell::internal::kShellWindowId_LockScreenContainer)->
+      AddChild(lock_widget->GetNativeView());
+  lock_widget->Show();
+  EXPECT_TRUE(Shell::GetInstance()->IsScreenLocked());
+  lock_widget->Hide();
+  EXPECT_FALSE(Shell::GetInstance()->IsScreenLocked());
+
+  // A modal window with a lock window as parent does not lock the screen. The
+  // screen is locked only when a lock windown is visible.
+  views::Widget* lock_modal_widget = views::Widget::CreateWindowWithParent(
+      new ModalWindow(), lock_widget->GetNativeView());
+  lock_modal_widget->Show();
+  EXPECT_FALSE(Shell::GetInstance()->IsScreenLocked());
+  lock_widget->Show();
+  EXPECT_TRUE(Shell::GetInstance()->IsScreenLocked());
+  lock_modal_widget->Close();
+  EXPECT_TRUE(Shell::GetInstance()->IsScreenLocked());
+  lock_widget->Close();
+  EXPECT_FALSE(Shell::GetInstance()->IsScreenLocked());
+}
+
 }  // namespace test
 }  // namespace aura_shell