[Chromecast] Add support for z-order and window focus.

chromecast/graphics/cast_focus_client_aura_test.cc

Index: chromecast/graphics/cast_focus_client_aura_test.cc
diff --git a/chromecast/graphics/cast_focus_client_aura_test.cc b/chromecast/graphics/cast_focus_client_aura_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6f04df9681b9b2c7dd4b5299a6f6eb4ca6e45663
--- /dev/null
+++ b/chromecast/graphics/cast_focus_client_aura_test.cc
@@ -0,0 +1,162 @@
+// Copyright 2017 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 "chromecast/graphics/cast_focus_client_aura.h"
+
+#include <memory>
+
+#include "ui/aura/test/aura_test_base.h"
+#include "ui/aura/test/test_window_delegate.h"
+#include "ui/aura/window.h"
+
+namespace chromecast {
+namespace test {
+
+using CastFocusClientAuraTest = aura::test::AuraTestBase;
+
+class TestWindow {
+ public:
+  TestWindow()
+      : delegate_(new aura::test::TestWindowDelegate()),
+        window_(new aura::Window(delegate_)) {
+    window_->Init(ui::LAYER_NOT_DRAWN);
+    window_->Show();
+  }
+
+  virtual ~TestWindow() {}
+
+  aura::test::TestWindowDelegate* delegate() const { return delegate_; }
+  aura::Window* window() const { return window_.get(); }
+
+ private:
+  aura::test::TestWindowDelegate* const delegate_;
+  std::unique_ptr<aura::Window> const window_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestWindow);
+};
+
+TEST_F(CastFocusClientAuraTest, FocusableWindows) {
+  std::unique_ptr<aura::WindowTreeHost> window_tree_host(
+      aura::WindowTreeHost::Create(gfx::Rect(0, 0, 1280, 720)));
+  window_tree_host->InitHost();
+  window_tree_host->Show();
+
+  CastFocusClientAura focus_client;
+
+  std::unique_ptr<TestWindow> test_window(new TestWindow);
+  window_tree_host->window()->AddChild(test_window->window());
+
+  // Confirm that we can't add an un-focusable window.
+  test_window->delegate()->set_can_focus(false);
+  focus_client.FocusWindow(test_window->window());
+  EXPECT_FALSE(focus_client.GetFocusedWindow());
+
+  // Confirm that we can add a focusable window.
+  test_window->delegate()->set_can_focus(true);
+  focus_client.FocusWindow(test_window->window());
+  EXPECT_EQ(test_window->window(), focus_client.GetFocusedWindow());
+
+  // Confirm that the focused window loses focus when losing visibility.
+  test_window->window()->Hide();
+  EXPECT_FALSE(focus_client.GetFocusedWindow());
+
+  // Confirm that we find a focusable window when it becomes visible.
+  test_window->window()->Show();
+  EXPECT_EQ(test_window->window(), focus_client.GetFocusedWindow());
+
+  // Confirm that the focused window loses focus when it is destroyed.
+  test_window.reset();
+  EXPECT_FALSE(focus_client.GetFocusedWindow());
+}
+
+TEST_F(CastFocusClientAuraTest, ChildFocus) {
+  std::unique_ptr<aura::WindowTreeHost> window_tree_host(
+      aura::WindowTreeHost::Create(gfx::Rect(0, 0, 1280, 720)));
+  window_tree_host->InitHost();
+  window_tree_host->Show();
+
+  CastFocusClientAura focus_client;
+
+  std::unique_ptr<TestWindow> parent(new TestWindow);
+  parent->delegate()->set_can_focus(true);
+  window_tree_host->window()->AddChild(parent->window());
+
+  std::unique_ptr<TestWindow> child(new TestWindow);
+  child->delegate()->set_can_focus(true);
+  parent->window()->AddChild(child->window());
+
+  // Confirm that the child window has the focus, not its top-level parent
+  // window.
+  focus_client.FocusWindow(child->window());
+  EXPECT_EQ(child->window(), focus_client.GetFocusedWindow());
+
+  // Confirm that removing the child window doesn't focus the parent window
+  // (since we've never requested focus for the parent window).
+  parent->window()->RemoveChild(child->window());
+  EXPECT_FALSE(focus_client.GetFocusedWindow());
+
+  // Confirm that we still have no focused window after re-adding the child
+  // window, because we haven't requested focus.
+  parent->window()->AddChild(child->window());
+  EXPECT_FALSE(focus_client.GetFocusedWindow());
+
+  // Request focus and confirm that the child is focused.
+  focus_client.FocusWindow(child->window());
+  EXPECT_EQ(child->window(), focus_client.GetFocusedWindow());
+}
+
+TEST_F(CastFocusClientAuraTest, ZOrder) {
+  std::unique_ptr<aura::WindowTreeHost> window_tree_host(
+      aura::WindowTreeHost::Create(gfx::Rect(0, 0, 1280, 720)));
+  window_tree_host->InitHost();
+  window_tree_host->Show();
+
+  CastFocusClientAura focus_client;
+
+  // Add the window with the lowest z-order.
+  std::unique_ptr<TestWindow> low(new TestWindow);
+  low->delegate()->set_can_focus(true);
+  low->window()->set_id(1);
+  window_tree_host->window()->AddChild(low->window());
+  focus_client.FocusWindow(low->window());
+  EXPECT_EQ(low->window(), focus_client.GetFocusedWindow());
+
+  // Add the window with the middle z-order, and confirm that it gets focus.
+  std::unique_ptr<TestWindow> middle(new TestWindow);
+  middle->delegate()->set_can_focus(true);
+  middle->window()->set_id(2);
+  window_tree_host->window()->AddChild(middle->window());
+  focus_client.FocusWindow(middle->window());
+  EXPECT_EQ(middle->window(), focus_client.GetFocusedWindow());
+
+  // Add the window with the highest z-order, and confirm that it gets focus.
+  std::unique_ptr<TestWindow> high(new TestWindow);
+  high->delegate()->set_can_focus(true);
+  high->window()->set_id(3);
+  window_tree_host->window()->AddChild(high->window());
+  focus_client.FocusWindow(high->window());
+  EXPECT_EQ(high->window(), focus_client.GetFocusedWindow());
+
+  // Confirm that requesting focus on the lower z-order windows leaves focus on
+  // the highest z-order window.
+  focus_client.FocusWindow(low->window());
+  EXPECT_EQ(high->window(), focus_client.GetFocusedWindow());
+  focus_client.FocusWindow(middle->window());
+  EXPECT_EQ(high->window(), focus_client.GetFocusedWindow());
+
+  // Confirm that focus moves to next highest window.
+  high.reset();
+  EXPECT_EQ(middle->window(), focus_client.GetFocusedWindow());
+
+  // Confirm that focus moves to next highest window.
+  middle.reset();
+  EXPECT_EQ(low->window(), focus_client.GetFocusedWindow());
+
+  // Confirm that there is no focused window.
+  low.reset();
+  EXPECT_FALSE(focus_client.GetFocusedWindow());
+}
+
+}  // namespace test
+}  // namespace chromecast