[Aura] Support always-on-top top level window.

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 "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 "views/widget/widget.h"
+
+namespace aura_shell {
+namespace test {
+
+namespace {
+
+views::Widget* CreateTestWindow(const views::Widget::InitParams& params) {
+  views::Widget* widget = new views::Widget;
+  widget->Init(params);
+  return widget;
+}
+
+aura::Window* GetDefaultContainer() {
+  return Shell::GetInstance()->GetContainer(
+        aura_shell::internal::kShellWindowId_DefaultContainer);
+}
+
+aura::Window* GetAlwaysOnTopContainer() {
+  return Shell::GetInstance()->GetContainer(
+        aura_shell::internal::kShellWindowId_AlwaysOnTopContainer);
+}
+
+void TestCreateWindow(views::Widget::InitParams::Type type,
+                      bool always_on_top,
+                      aura::Window* expected_container) {
+  views::Widget::InitParams widget_params(type);
+  widget_params.keep_on_top = always_on_top;
+
+  views::Widget* widget = CreateTestWindow(widget_params);
+  widget->Show();
+
+  EXPECT_EQ(expected_container, widget->GetNativeWindow()->parent()) <<
+      "TestCreateWindow: type=" << type << ", always_on_top=" << always_on_top;
+
+  widget->Close();
+}
+
+}  // namespace
+
+class ShellTest : public aura::test::AuraTestBase {
+ public:
+  ShellTest() {}
+  virtual ~ShellTest() {}
+
+  virtual void SetUp() OVERRIDE {
+    aura::test::AuraTestBase::SetUp();
+
+    // Triggers Shell creation and hook with Desktop.
+    aura_shell::Shell::GetInstance();
+  }
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(ShellTest);
+};
+
+TEST_F(ShellTest, CreateWindow) {
+  // Normal window should be created in default container.
+  TestCreateWindow(views::Widget::InitParams::TYPE_WINDOW,
+                   false,  // always_on_top
+                   GetDefaultContainer());
+  TestCreateWindow(views::Widget::InitParams::TYPE_POPUP,
+                   false,  // always_on_top
+                   GetDefaultContainer());
+
+  // Always-on-top window and popup are created in always-on-top container.
+  TestCreateWindow(views::Widget::InitParams::TYPE_WINDOW,
+                   true,  // always_on_top
+                   GetAlwaysOnTopContainer());
+  TestCreateWindow(views::Widget::InitParams::TYPE_POPUP,
+                   true,  // always_on_top
+                   GetAlwaysOnTopContainer());
+}
+
+TEST_F(ShellTest, ChangeAlwaysOnTop) {
+  views::Widget::InitParams widget_params(
+      views::Widget::InitParams::TYPE_WINDOW);
+
+  // Creates a normal window
+  views::Widget* widget = CreateTestWindow(widget_params);
+  widget->Show();
+
+  // It should be in default container.
+  EXPECT_EQ(GetDefaultContainer(), widget->GetNativeWindow()->parent());
+
+  // Flip always-on-top flag.
+  widget->SetAlwaysOnTop(true);
+  // And it should in always on top container now.
+  EXPECT_EQ(GetAlwaysOnTopContainer(), widget->GetNativeWindow()->parent());
+
+  // Flip always-on-top flag.
+  widget->SetAlwaysOnTop(false);
+  // It should go back to default container.
+  EXPECT_EQ(GetDefaultContainer(), widget->GetNativeWindow()->parent());
+
+  // Set the same always-on-top flag again.
+  widget->SetAlwaysOnTop(false);
+  // Should have no effect and we are still in the default container.
+  EXPECT_EQ(GetDefaultContainer(), widget->GetNativeWindow()->parent());
+
+  widget->Close();
+}
+
+}  // namespace test
+}  // namespace aura_shell