// Copyright (c) 2012 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/display/window_tree_host_manager.h"

#include <memory>

#include "ash/display/display_util.h"
#include "ash/screen_util.h"
#include "ash/shelf/shelf.h"
#include "ash/shelf/shelf_constants.h"
#include "ash/shelf/shelf_widget.h"
#include "ash/shell.h"
#include "ash/test/ash_test_base.h"
#include "ash/test/ash_test_helper.h"
#include "ash/test_shell_delegate.h"
#include "ash/wm/cursor_manager_test_api.h"
#include "ash/wm/window_state.h"
#include "ash/wm/wm_event.h"
#include "base/bind_helpers.h"
#include "base/command_line.h"
#include "base/run_loop.h"
#include "base/test/scoped_feature_list.h"
#include "services/ws/test_window_tree_client.h"
#include "ui/aura/client/focus_change_observer.h"
#include "ui/aura/client/focus_client.h"
#include "ui/aura/env.h"
#include "ui/aura/window_observer.h"
#include "ui/aura/window_tracker.h"
#include "ui/aura/window_tree_host.h"
#include "ui/display/display.h"
#include "ui/display/display_layout.h"
#include "ui/display/display_layout_builder.h"
#include "ui/display/display_observer.h"
#include "ui/display/display_switches.h"
#include "ui/display/manager/display_layout_store.h"
#include "ui/display/manager/display_manager.h"
#include "ui/display/manager/managed_display_info.h"
#include "ui/display/screen.h"
#include "ui/display/test/display_manager_test_api.h"
#include "ui/events/event_handler.h"
#include "ui/events/keycodes/keyboard_codes.h"
#include "ui/events/test/event_generator.h"
#include "ui/views/mouse_watcher.h"
#include "ui/views/mouse_watcher_view_host.h"
#include "ui/views/view.h"
#include "ui/views/widget/widget.h"
#include "ui/wm/public/activation_change_observer.h"
#include "ui/wm/public/activation_client.h"

namespace ash {
namespace {

const char kWallpaperView[] = "WallpaperView";

template <typename T>
class Resetter {
 public:
  explicit Resetter(T* value) : value_(*value) { *value = 0; }
  ~Resetter() = default;
  T value() { return value_; }

 private:
  T value_;
  DISALLOW_COPY_AND_ASSIGN(Resetter);
};

class TestObserver : public WindowTreeHostManager::Observer,
                     public display::DisplayObserver,
                     public aura::client::FocusChangeObserver,
                     public ::wm::ActivationChangeObserver {
 public:
  TestObserver() {
    Shell::Get()->window_tree_host_manager()->AddObserver(this);
    display::Screen::GetScreen()->AddObserver(this);
    aura::client::GetFocusClient(Shell::GetPrimaryRootWindow())
        ->AddObserver(this);
    ::wm::GetActivationClient(Shell::GetPrimaryRootWindow())->AddObserver(this);
  }

  ~TestObserver() override {
    Shell::Get()->window_tree_host_manager()->RemoveObserver(this);
    display::Screen::GetScreen()->RemoveObserver(this);
    aura::client::GetFocusClient(Shell::GetPrimaryRootWindow())
        ->RemoveObserver(this);
    ::wm::GetActivationClient(Shell::GetPrimaryRootWindow())
        ->RemoveObserver(this);
  }

  // Overridden from WindowTreeHostManager::Observer
  void OnDisplayConfigurationChanging() override { ++changing_count_; }
  void OnDisplayConfigurationChanged() override { ++changed_count_; }

  // Overrideen from display::DisplayObserver
  void OnDisplayMetricsChanged(const display::Display& display,
                               uint32_t metrics) override {
    changed_display_id_ = display.id();
    if (metrics & DISPLAY_METRIC_BOUNDS)
      ++bounds_changed_count_;
    if (metrics & DISPLAY_METRIC_ROTATION)
      ++rotation_changed_count_;
    if (metrics & DISPLAY_METRIC_WORK_AREA)
      ++workarea_changed_count_;
    if (metrics & DISPLAY_METRIC_PRIMARY)
      ++primary_changed_count_;
  }

  // Overridden from aura::client::FocusChangeObserver
  void OnWindowFocused(aura::Window* gained_focus,
                       aura::Window* lost_focus) override {
    focus_changed_count_++;
  }

  // Overridden from wm::ActivationChangeObserver
  void OnWindowActivated(
      ::wm::ActivationChangeObserver::ActivationReason reason,
      aura::Window* gained_active,
      aura::Window* lost_active) override {
    activation_changed_count_++;
  }
  void OnAttemptToReactivateWindow(aura::Window* request_active,
                                   aura::Window* actual_active) override {}

  int CountAndReset() {
    EXPECT_EQ(changing_count_, changed_count_);
    changed_count_ = 0;
    return Resetter<int>(&changing_count_).value();
  }

  int64_t GetBoundsChangedCountAndReset() {
    return Resetter<int>(&bounds_changed_count_).value();
  }

  int64_t GetRotationChangedCountAndReset() {
    return Resetter<int>(&rotation_changed_count_).value();
  }

  int64_t GetWorkareaChangedCountAndReset() {
    return Resetter<int>(&workarea_changed_count_).value();
  }

  int64_t GetPrimaryChangedCountAndReset() {
    return Resetter<int>(&primary_changed_count_).value();
  }

  int64_t GetChangedDisplayIdAndReset() {
    return Resetter<int64_t>(&changed_display_id_).value();
  }

  int GetFocusChangedCountAndReset() {
    return Resetter<int>(&focus_changed_count_).value();
  }

  int GetActivationChangedCountAndReset() {
    return Resetter<int>(&activation_changed_count_).value();
  }

 private:
  int changing_count_ = 0;
  int changed_count_ = 0;

  int bounds_changed_count_ = 0;
  int rotation_changed_count_ = 0;
  int workarea_changed_count_ = 0;
  int primary_changed_count_ = 0;
  int64_t changed_display_id_ = 0;

  int focus_changed_count_ = 0;
  int activation_changed_count_ = 0;

  DISALLOW_COPY_AND_ASSIGN(TestObserver);
};

class TestHelper {
 public:
  explicit TestHelper(AshTestBase* delegate);
  ~TestHelper();

  void SetSecondaryDisplayLayoutAndOffset(
      display::DisplayPlacement::Position position,
      int offset);

  void SetSecondaryDisplayLayout(display::DisplayPlacement::Position position);

  void SetDefaultDisplayLayout(display::DisplayPlacement::Position position);

  float GetStoredZoomScale(int64_t id);

 private:
  AshTestBase* delegate_;  // Not owned
  DISALLOW_COPY_AND_ASSIGN(TestHelper);
};

TestHelper::TestHelper(AshTestBase* delegate) : delegate_(delegate) {}
TestHelper::~TestHelper() = default;

void TestHelper::SetSecondaryDisplayLayoutAndOffset(
    display::DisplayPlacement::Position position,
    int offset) {
  std::unique_ptr<display::DisplayLayout> layout(
      display::test::CreateDisplayLayout(delegate_->display_manager(), position,
                                         offset));
  ASSERT_GT(display::Screen::GetScreen()->GetNumDisplays(), 1);
  delegate_->display_manager()->SetLayoutForCurrentDisplays(std::move(layout));
}

void TestHelper::SetSecondaryDisplayLayout(
    display::DisplayPlacement::Position position) {
  SetSecondaryDisplayLayoutAndOffset(position, 0);
}

void TestHelper::SetDefaultDisplayLayout(
    display::DisplayPlacement::Position position) {
  display::DisplayPlacement default_placement(position, 0);
  delegate_->display_manager()->layout_store()->SetDefaultDisplayPlacement(
      default_placement);
}

float TestHelper::GetStoredZoomScale(int64_t id) {
  return delegate_->display_manager()->GetDisplayInfo(id).zoom_factor();
}

class WindowTreeHostManagerShutdownTest : public AshTestBase,
                                          public TestHelper {
 public:
  WindowTreeHostManagerShutdownTest() : TestHelper(this) {}
  ~WindowTreeHostManagerShutdownTest() override = default;

  void TearDown() override {
    AshTestBase::TearDown();

    // Make sure that primary display is accessible after shutdown.
    display::Display primary =
        display::Screen::GetScreen()->GetPrimaryDisplay();
    EXPECT_EQ("0,0 444x333", primary.bounds().ToString());
    EXPECT_EQ(2, display::Screen::GetScreen()->GetNumDisplays());
  }

 private:
  DISALLOW_COPY_AND_ASSIGN(WindowTreeHostManagerShutdownTest);
};

class WindowTreeHostManagerStartupTest : public AshTestBase, public TestHelper {
 public:
  WindowTreeHostManagerStartupTest() : TestHelper(this) {}
  ~WindowTreeHostManagerStartupTest() override = default;

 private:
  DISALLOW_COPY_AND_ASSIGN(WindowTreeHostManagerStartupTest);
};

class TestEventHandler : public ui::EventHandler {
 public:
  TestEventHandler()
      : target_root_(nullptr),
        touch_radius_x_(0.0),
        touch_radius_y_(0.0),
        scroll_x_offset_(0.0),
        scroll_y_offset_(0.0),
        scroll_x_offset_ordinal_(0.0),
        scroll_y_offset_ordinal_(0.0) {}
  ~TestEventHandler() override = default;

  void OnMouseEvent(ui::MouseEvent* event) override {
    if (event->flags() & ui::EF_IS_SYNTHESIZED &&
        event->type() != ui::ET_MOUSE_EXITED &&
        event->type() != ui::ET_MOUSE_ENTERED) {
      return;
    }
    aura::Window* target = static_cast<aura::Window*>(event->target());
    mouse_location_ = event->root_location();
    target_root_ = target->GetRootWindow();
    event->StopPropagation();
  }

  void OnTouchEvent(ui::TouchEvent* event) override {
    aura::Window* target = static_cast<aura::Window*>(event->target());
    // Only record when the target is the wallpaper, which covers the entire
    // root window.
    if (target->GetName() != kWallpaperView)
      return;
    touch_radius_x_ = event->pointer_details().radius_x;
    touch_radius_y_ = event->pointer_details().radius_y;
    event->StopPropagation();
  }

  void OnScrollEvent(ui::ScrollEvent* event) override {
    aura::Window* target = static_cast<aura::Window*>(event->target());
    // Only record when the target is the wallpaper, which covers the entire
    // root window.
    if (target->GetName() != kWallpaperView)
      return;

    if (event->type() == ui::ET_SCROLL) {
      scroll_x_offset_ = event->x_offset();
      scroll_y_offset_ = event->y_offset();
      scroll_x_offset_ordinal_ = event->x_offset_ordinal();
      scroll_y_offset_ordinal_ = event->y_offset_ordinal();
    }
    event->StopPropagation();
  }

  std::string GetLocationAndReset() {
    std::string result = mouse_location_.ToString();
    mouse_location_.SetPoint(0, 0);
    target_root_ = nullptr;
    return result;
  }

  float touch_radius_x() { return touch_radius_x_; }
  float touch_radius_y() { return touch_radius_y_; }
  float scroll_x_offset() { return scroll_x_offset_; }
  float scroll_y_offset() { return scroll_y_offset_; }
  float scroll_x_offset_ordinal() { return scroll_x_offset_ordinal_; }
  float scroll_y_offset_ordinal() { return scroll_y_offset_ordinal_; }

 private:
  gfx::Point mouse_location_;
  aura::Window* target_root_;

  float touch_radius_x_;
  float touch_radius_y_;
  float scroll_x_offset_;
  float scroll_y_offset_;
  float scroll_x_offset_ordinal_;
  float scroll_y_offset_ordinal_;

  DISALLOW_COPY_AND_ASSIGN(TestEventHandler);
};


class TestMouseWatcherListener : public views::MouseWatcherListener {
 public:
  TestMouseWatcherListener() = default;

 private:
  // views::MouseWatcherListener:
  void MouseMovedOutOfHost() override {}

  DISALLOW_COPY_AND_ASSIGN(TestMouseWatcherListener);
};

}  // namespace

class WindowTreeHostManagerTest : public AshTestBase, public TestHelper {
 public:
  WindowTreeHostManagerTest() : TestHelper(this) {}
  ~WindowTreeHostManagerTest() override = default;

 private:
  DISALLOW_COPY_AND_ASSIGN(WindowTreeHostManagerTest);
};

TEST_F(WindowTreeHostManagerShutdownTest, Shutdown) {
  UpdateDisplay("444x333, 200x200");
}

TEST_F(WindowTreeHostManagerStartupTest, Startup) {
  // Ensure that WindowTreeHostManager was initialized and created at least one
  // root window.
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
  EXPECT_FALSE(root_windows.empty());
}

TEST_F(WindowTreeHostManagerTest, SecondaryDisplayLayout) {
  // Creates windows to catch activation change event.
  std::unique_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
  w1->Focus();

  TestObserver observer;
  UpdateDisplay("500x500,400x400");
  EXPECT_EQ(1, observer.CountAndReset());  // resize and add
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(2, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  gfx::Insets insets(5, 5, 5, 5);
  int64_t secondary_display_id = display_manager()->GetSecondaryDisplay().id();
  display_manager()->UpdateWorkAreaOfDisplay(secondary_display_id, insets);

  // Default layout is RIGHT.
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("500,0 400x400", GetSecondaryDisplay().bounds().ToString());
  EXPECT_EQ("505,5 390x390", GetSecondaryDisplay().work_area().ToString());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());

  // Layout the secondary display to the bottom of the primary.
  SetSecondaryDisplayLayout(display::DisplayPlacement::BOTTOM);
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  // TODO (oshima): work area changes twice because ShelfLayoutManager updates
  // to its own insets.
  EXPECT_EQ(2, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("0,500 400x400", GetSecondaryDisplay().bounds().ToString());
  EXPECT_EQ("5,505 390x390", GetSecondaryDisplay().work_area().ToString());

  // Layout the secondary display to the left of the primary.
  SetSecondaryDisplayLayout(display::DisplayPlacement::LEFT);
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("-400,0 400x400", GetSecondaryDisplay().bounds().ToString());
  EXPECT_EQ("-395,5 390x390", GetSecondaryDisplay().work_area().ToString());

  // Layout the secondary display to the top of the primary.
  SetSecondaryDisplayLayout(display::DisplayPlacement::TOP);
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("0,-400 400x400", GetSecondaryDisplay().bounds().ToString());
  EXPECT_EQ("5,-395 390x390", GetSecondaryDisplay().work_area().ToString());

  // Layout to the right with an offset.
  SetSecondaryDisplayLayoutAndOffset(display::DisplayPlacement::RIGHT, 300);
  EXPECT_EQ(1, observer.CountAndReset());  // resize and add
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("500,300 400x400", GetSecondaryDisplay().bounds().ToString());

  // Keep the minimum 100.
  SetSecondaryDisplayLayoutAndOffset(display::DisplayPlacement::RIGHT, 490);
  EXPECT_EQ(1, observer.CountAndReset());  // resize and add
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("500,400 400x400", GetSecondaryDisplay().bounds().ToString());

  SetSecondaryDisplayLayoutAndOffset(display::DisplayPlacement::RIGHT, -400);
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(1, observer.CountAndReset());  // resize and add
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("500,-300 400x400", GetSecondaryDisplay().bounds().ToString());

  //  Layout to the bottom with an offset.
  SetSecondaryDisplayLayoutAndOffset(display::DisplayPlacement::BOTTOM, -200);
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(1, observer.CountAndReset());  // resize and add
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("-200,500 400x400", GetSecondaryDisplay().bounds().ToString());

  // Keep the minimum 100.
  SetSecondaryDisplayLayoutAndOffset(display::DisplayPlacement::BOTTOM, 490);
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(1, observer.CountAndReset());  // resize and add
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("400,500 400x400", GetSecondaryDisplay().bounds().ToString());

  SetSecondaryDisplayLayoutAndOffset(display::DisplayPlacement::BOTTOM, -400);
  EXPECT_EQ(secondary_display_id, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(1, observer.CountAndReset());  // resize and add
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("-300,500 400x400", GetSecondaryDisplay().bounds().ToString());

  // Setting the same layout shouldn't invoke observers.
  SetSecondaryDisplayLayoutAndOffset(display::DisplayPlacement::BOTTOM, -400);
  EXPECT_EQ(0, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ(0, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(0, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(0, observer.CountAndReset());  // resize and add
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ("0,0 500x500", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("-300,500 400x400", GetSecondaryDisplay().bounds().ToString());

  UpdateDisplay("500x500");
  EXPECT_LE(1, observer.GetFocusChangedCountAndReset());
  EXPECT_LE(1, observer.GetActivationChangedCountAndReset());
}

namespace {

display::ManagedDisplayInfo
CreateDisplayInfo(int64_t id, int y, display::Display::Rotation rotation) {
  display::ManagedDisplayInfo info(id, "", false);
  info.SetBounds(gfx::Rect(0, y, 500, 500));
  info.SetRotation(rotation, display::Display::RotationSource::ACTIVE);
  return info;
}

display::ManagedDisplayInfo CreateMirroredDisplayInfo(
    int64_t id,
    float device_scale_factor) {
  display::ManagedDisplayInfo info =
      CreateDisplayInfo(id, 0, display::Display::ROTATE_0);
  info.set_device_scale_factor(device_scale_factor);
  return info;
}

}  // namespace

TEST_F(WindowTreeHostManagerTest, MirrorToDockedWithFullscreen) {
  // Creates windows to catch activation change event.
  std::unique_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
  w1->Focus();

  // Docked mode.

  const display::ManagedDisplayInfo internal_display_info =
      CreateMirroredDisplayInfo(1, 2.0f);
  const display::ManagedDisplayInfo external_display_info =
      CreateMirroredDisplayInfo(2, 1.0f);

  std::vector<display::ManagedDisplayInfo> display_info_list;
  // Mirror.
  display_info_list.push_back(internal_display_info);
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  const int64_t internal_display_id =
      display::test::DisplayManagerTestApi(display_manager())
          .SetFirstDisplayAsInternalDisplay();
  EXPECT_EQ(1, internal_display_id);
  EXPECT_EQ(2U, display_manager()->num_connected_displays());
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());

  wm::WindowState* window_state = wm::GetWindowState(w1.get());
  const wm::WMEvent toggle_fullscreen_event(wm::WM_EVENT_TOGGLE_FULLSCREEN);
  window_state->OnWMEvent(&toggle_fullscreen_event);
  EXPECT_TRUE(window_state->IsFullscreen());
  EXPECT_EQ("0,0 250x250", w1->bounds().ToString());
  // Dock mode.
  TestObserver observer;
  display_info_list.clear();
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_EQ(1U, display_manager()->num_connected_displays());
  // Observers are called due to primary change.
  EXPECT_EQ(2, observer.GetChangedDisplayIdAndReset());
  EXPECT_EQ(1, observer.GetBoundsChangedCountAndReset());
  EXPECT_EQ(1, observer.GetWorkareaChangedCountAndReset());
  EXPECT_EQ(1, observer.GetPrimaryChangedCountAndReset());
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());

  EXPECT_TRUE(window_state->IsFullscreen());
  EXPECT_EQ("0,0 500x500", w1->bounds().ToString());
}

TEST_F(WindowTreeHostManagerTest, BoundsUpdated) {
  // Creates windows to catch activation change event.
  std::unique_ptr<aura::Window> w1(CreateTestWindowInShellWithId(1));
  w1->Focus();

  TestObserver observer;
  SetDefaultDisplayLayout(display::DisplayPlacement::BOTTOM);
  UpdateDisplay("200x200,300x300");  // layout, resize and add.
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());

  gfx::Insets insets(5, 5, 5, 5);
  display_manager()->UpdateWorkAreaOfDisplay(GetSecondaryDisplay().id(),
                                             insets);

  EXPECT_EQ("0,0 200x200", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("0,200 300x300", GetSecondaryDisplay().bounds().ToString());
  EXPECT_EQ("5,205 290x290", GetSecondaryDisplay().work_area().ToString());

  UpdateDisplay("400x400,200x200");
  EXPECT_EQ(1, observer.CountAndReset());  // two resizes
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ("0,0 400x400", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("0,400 200x200", GetSecondaryDisplay().bounds().ToString());

  UpdateDisplay("400x400,300x300");
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ("0,0 400x400", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("0,400 300x300", GetSecondaryDisplay().bounds().ToString());

  UpdateDisplay("400x400");
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_LE(1, observer.GetFocusChangedCountAndReset());
  EXPECT_LE(1, observer.GetActivationChangedCountAndReset());
  EXPECT_EQ("0,0 400x400", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ(1, display::Screen::GetScreen()->GetNumDisplays());

  UpdateDisplay("400x500*2,300x300");
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  ASSERT_EQ(2, display::Screen::GetScreen()->GetNumDisplays());
  EXPECT_EQ("0,0 200x250", GetPrimaryDisplay().bounds().ToString());
  EXPECT_EQ("0,250 300x300", GetSecondaryDisplay().bounds().ToString());

  // No change
  UpdateDisplay("400x500*2,300x300");
  // We still call into Pre/PostDisplayConfigurationChange().
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());

  // Rotation
  observer.GetRotationChangedCountAndReset();  // we only want to reset.
  int64_t primary_id = GetPrimaryDisplay().id();
  display_manager()->SetDisplayRotation(
      primary_id, display::Display::ROTATE_90,
      display::Display::RotationSource::ACTIVE);
  EXPECT_EQ(1, observer.GetRotationChangedCountAndReset());
  EXPECT_EQ(1, observer.CountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
  display_manager()->SetDisplayRotation(
      primary_id, display::Display::ROTATE_90,
      display::Display::RotationSource::ACTIVE);
  EXPECT_EQ(0, observer.GetRotationChangedCountAndReset());
  EXPECT_EQ(0, observer.CountAndReset());
  EXPECT_EQ(0, observer.GetFocusChangedCountAndReset());
  EXPECT_EQ(0, observer.GetActivationChangedCountAndReset());
}

TEST_F(WindowTreeHostManagerTest, FindNearestDisplay) {
  WindowTreeHostManager* window_tree_host_manager =
      Shell::Get()->window_tree_host_manager();

  UpdateDisplay("200x200,300x300");
  display_manager()->SetLayoutForCurrentDisplays(
      display::test::CreateDisplayLayout(display_manager(),
                                         display::DisplayPlacement::RIGHT, 50));

  display::Display primary_display =
      display::Screen::GetScreen()->GetPrimaryDisplay();
  display::Display secondary_display = display_manager()->GetSecondaryDisplay();
  EXPECT_NE(primary_display.id(), secondary_display.id());
  aura::Window* primary_root =
      window_tree_host_manager->GetRootWindowForDisplayId(primary_display.id());
  aura::Window* secondary_root =
      window_tree_host_manager->GetRootWindowForDisplayId(
          secondary_display.id());
  EXPECT_NE(primary_root, secondary_root);

  // Test that points outside of any display return the nearest display.
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(-100, 0))
                .id());
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(0, -100))
                .id());
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(100, 100))
                .id());
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(224, 25))
                .id());
  EXPECT_EQ(secondary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(226, 25))
                .id());
  EXPECT_EQ(secondary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(600, 100))
                .id());
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(174, 225))
                .id());
  EXPECT_EQ(secondary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(176, 225))
                .id());
  EXPECT_EQ(secondary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(300, 400))
                .id());
}

TEST_F(WindowTreeHostManagerTest, SwapPrimaryById) {
  WindowTreeHostManager* window_tree_host_manager =
      Shell::Get()->window_tree_host_manager();

  UpdateDisplay("200x200,300x300");
  const int shelf_inset_first = 200 - ShelfConstants::shelf_size();
  const int shelf_inset_second = 300 - ShelfConstants::shelf_size();
  display::Display primary_display =
      display::Screen::GetScreen()->GetPrimaryDisplay();
  display::Display secondary_display = display_manager()->GetSecondaryDisplay();

  display_manager()->SetLayoutForCurrentDisplays(
      display::test::CreateDisplayLayout(display_manager(),
                                         display::DisplayPlacement::RIGHT, 50));

  EXPECT_NE(primary_display.id(), secondary_display.id());
  aura::Window* primary_root =
      window_tree_host_manager->GetRootWindowForDisplayId(primary_display.id());
  aura::Window* secondary_root =
      window_tree_host_manager->GetRootWindowForDisplayId(
          secondary_display.id());
  aura::Window* shelf_window =
      GetPrimaryShelf()->shelf_widget()->GetNativeView();
  EXPECT_TRUE(primary_root->Contains(shelf_window));
  EXPECT_FALSE(secondary_root->Contains(shelf_window));
  EXPECT_NE(primary_root, secondary_root);
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(-100, -100))
                .id());
  EXPECT_EQ(
      primary_display.id(),
      display::Screen::GetScreen()->GetDisplayNearestWindow(nullptr).id());

  EXPECT_EQ("0,0 200x200", primary_display.bounds().ToString());
  EXPECT_EQ(gfx::Rect(0, 0, 200, shelf_inset_first).ToString(),
            primary_display.work_area().ToString());
  EXPECT_EQ("200,0 300x300", secondary_display.bounds().ToString());
  EXPECT_EQ(gfx::Rect(200, 0, 300, shelf_inset_second).ToString(),
            secondary_display.work_area().ToString());
  EXPECT_EQ("id=2200000001, parent=2200000000, right, 50",
            display_manager()
                ->GetCurrentDisplayLayout()
                .placement_list[0]
                .ToString());

  // Switch primary and secondary by display ID.
  TestObserver observer;
  window_tree_host_manager->SetPrimaryDisplayId(secondary_display.id());
  EXPECT_EQ(secondary_display.id(),
            display::Screen::GetScreen()->GetPrimaryDisplay().id());
  EXPECT_EQ(primary_display.id(),
            display_manager()->GetSecondaryDisplay().id());
  EXPECT_LT(0, observer.CountAndReset());

  EXPECT_EQ(primary_root, window_tree_host_manager->GetRootWindowForDisplayId(
                              secondary_display.id()));
  EXPECT_EQ(secondary_root, window_tree_host_manager->GetRootWindowForDisplayId(
                                primary_display.id()));
  EXPECT_TRUE(primary_root->Contains(shelf_window));
  EXPECT_FALSE(secondary_root->Contains(shelf_window));

  const display::DisplayLayout& inverted_layout =
      display_manager()->GetCurrentDisplayLayout();

  EXPECT_EQ("id=2200000000, parent=2200000001, left, -50",
            inverted_layout.placement_list[0].ToString());
  // Test if the bounds are correctly swapped.
  display::Display swapped_primary =
      display::Screen::GetScreen()->GetPrimaryDisplay();
  display::Display swapped_secondary = display_manager()->GetSecondaryDisplay();
  EXPECT_EQ("0,0 300x300", swapped_primary.bounds().ToString());
  EXPECT_EQ(gfx::Rect(0, 0, 300, shelf_inset_second).ToString(),
            swapped_primary.work_area().ToString());
  EXPECT_EQ("-200,-50 200x200", swapped_secondary.bounds().ToString());
  EXPECT_EQ(gfx::Rect(-200, -50, 200, shelf_inset_first).ToString(),
            swapped_secondary.work_area().ToString());

  // Calling the same ID don't do anything.
  window_tree_host_manager->SetPrimaryDisplayId(secondary_display.id());
  EXPECT_EQ(0, observer.CountAndReset());

  aura::WindowTracker tracker;
  tracker.Add(primary_root);
  tracker.Add(secondary_root);

  // Deleting 2nd display should move the primary to original primary display.
  UpdateDisplay("200x200");
  base::RunLoop().RunUntilIdle();  // RootWindow is deleted in a posted task.
  EXPECT_EQ(1, display::Screen::GetScreen()->GetNumDisplays());
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()->GetPrimaryDisplay().id());
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()
                ->GetDisplayNearestPoint(gfx::Point(-100, -100))
                .id());
  EXPECT_EQ(
      primary_display.id(),
      display::Screen::GetScreen()->GetDisplayNearestWindow(nullptr).id());
  EXPECT_TRUE(tracker.Contains(primary_root));
  EXPECT_FALSE(tracker.Contains(secondary_root));
  EXPECT_TRUE(primary_root->Contains(shelf_window));

  // Adding 2nd display with the same ID.  The 2nd display should become primary
  // since secondary id is still stored as desirable_primary_id.
  std::vector<display::ManagedDisplayInfo> display_info_list;
  display_info_list.push_back(
      display_manager()->GetDisplayInfo(primary_display.id()));
  display_info_list.push_back(
      display_manager()->GetDisplayInfo(secondary_display.id()));

  display_manager()->OnNativeDisplaysChanged(display_info_list);

  EXPECT_EQ(2, display::Screen::GetScreen()->GetNumDisplays());
  EXPECT_EQ(secondary_display.id(),
            display::Screen::GetScreen()->GetPrimaryDisplay().id());
  EXPECT_EQ(primary_display.id(),
            display_manager()->GetSecondaryDisplay().id());
  EXPECT_EQ(primary_root, window_tree_host_manager->GetRootWindowForDisplayId(
                              secondary_display.id()));
  EXPECT_NE(primary_root, window_tree_host_manager->GetRootWindowForDisplayId(
                              primary_display.id()));
  EXPECT_TRUE(primary_root->Contains(shelf_window));

  // Deleting 2nd display and adding 2nd display with a different ID.  The 2nd
  // display shouldn't become primary.
  UpdateDisplay("200x200");
  display::ManagedDisplayInfo third_display_info(secondary_display.id() + 1,
                                                 std::string(), false);
  third_display_info.SetBounds(secondary_display.bounds());
  ASSERT_NE(primary_display.id(), third_display_info.id());

  const display::ManagedDisplayInfo& primary_display_info =
      display_manager()->GetDisplayInfo(primary_display.id());
  std::vector<display::ManagedDisplayInfo> display_info_list2;
  display_info_list2.push_back(primary_display_info);
  display_info_list2.push_back(third_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list2);
  EXPECT_EQ(2, display::Screen::GetScreen()->GetNumDisplays());
  EXPECT_EQ(primary_display.id(),
            display::Screen::GetScreen()->GetPrimaryDisplay().id());
  EXPECT_EQ(third_display_info.id(),
            display_manager()->GetSecondaryDisplay().id());
  EXPECT_EQ(primary_root, window_tree_host_manager->GetRootWindowForDisplayId(
                              primary_display.id()));
  EXPECT_NE(primary_root, window_tree_host_manager->GetRootWindowForDisplayId(
                              third_display_info.id()));
  EXPECT_TRUE(primary_root->Contains(shelf_window));
}

TEST_F(WindowTreeHostManagerTest, SetPrimaryWithThreeDisplays) {
  UpdateDisplay("500x400,400x300,300x200");
  int64_t primary_id = display::Screen::GetScreen()->GetPrimaryDisplay().id();
  display::DisplayIdList non_primary_ids =
      display_manager()->GetCurrentDisplayIdList();
  auto itr =
      std::remove(non_primary_ids.begin(), non_primary_ids.end(), primary_id);
  ASSERT_TRUE(itr != non_primary_ids.end());
  non_primary_ids.erase(itr, non_primary_ids.end());
  ASSERT_EQ(2u, non_primary_ids.size());

  // Build the following layout:
  //
  // +----------------+       +--------------------+
  // | primary_id (P) | <---- | non_primary_ids[0] |
  // +----------------+       +--------------------+
  //      ^
  //      |
  // +--------------------+
  // | non_primary_ids[1] |
  // +--------------------+
  display::DisplayLayoutBuilder builder(primary_id);
  builder.AddDisplayPlacement(non_primary_ids[0], primary_id,
                              display::DisplayPlacement::RIGHT, 0);
  builder.AddDisplayPlacement(non_primary_ids[1], primary_id,
                              display::DisplayPlacement::BOTTOM, 0);
  display_manager()->SetLayoutForCurrentDisplays(builder.Build());

  EXPECT_EQ(primary_id, display::Screen::GetScreen()->GetPrimaryDisplay().id());
  WindowTreeHostManager* window_tree_host_manager =
      Shell::Get()->window_tree_host_manager();

  aura::Window* primary_root =
      window_tree_host_manager->GetRootWindowForDisplayId(primary_id);
  aura::Window* non_primary_root_0 =
      window_tree_host_manager->GetRootWindowForDisplayId(non_primary_ids[0]);
  aura::Window* non_primary_root_1 =
      window_tree_host_manager->GetRootWindowForDisplayId(non_primary_ids[1]);

  // Make non_primary_ids[0] primary.
  window_tree_host_manager->SetPrimaryDisplayId(non_primary_ids[0]);
  EXPECT_EQ(non_primary_ids[0],
            display::Screen::GetScreen()->GetPrimaryDisplay().id());

  // Expect the root windows to be swapped.
  EXPECT_EQ(primary_root, window_tree_host_manager->GetRootWindowForDisplayId(
                              non_primary_ids[0]));
  EXPECT_EQ(non_primary_root_0,
            window_tree_host_manager->GetRootWindowForDisplayId(primary_id));
  EXPECT_EQ(
      non_primary_root_1,
      window_tree_host_manager->GetRootWindowForDisplayId(non_primary_ids[1]));

  // Expect that the layout will be changed to:
  //
  // +----------------+       +-----------------------+
  // | primary_id     | ----> | non_primary_ids[0] (P)|
  // +----------------+       +-----------------------+
  //      ^
  //      |
  // +--------------------+
  // | non_primary_ids[1] |
  // +--------------------+
  {
    const display::DisplayLayout& current_layout =
        display_manager()->GetCurrentDisplayLayout();
    EXPECT_EQ(non_primary_ids[0], current_layout.primary_id);
    ASSERT_EQ(2u, current_layout.placement_list.size());
    EXPECT_EQ(primary_id, current_layout.placement_list[0].display_id);
    EXPECT_EQ(non_primary_ids[0],
              current_layout.placement_list[0].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::LEFT,
              current_layout.placement_list[0].position);
    EXPECT_EQ(non_primary_ids[1], current_layout.placement_list[1].display_id);
    EXPECT_EQ(primary_id, current_layout.placement_list[1].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::BOTTOM,
              current_layout.placement_list[1].position);
  }

  // Make non_primary_ids[1] primary.
  window_tree_host_manager->SetPrimaryDisplayId(non_primary_ids[1]);
  EXPECT_EQ(non_primary_ids[1],
            display::Screen::GetScreen()->GetPrimaryDisplay().id());

  // Expect the root windows to be swapped.
  EXPECT_EQ(primary_root, window_tree_host_manager->GetRootWindowForDisplayId(
                              non_primary_ids[1]));
  EXPECT_EQ(
      non_primary_root_1,
      window_tree_host_manager->GetRootWindowForDisplayId(non_primary_ids[0]));
  EXPECT_EQ(non_primary_root_0,
            window_tree_host_manager->GetRootWindowForDisplayId(primary_id));

  // Expect that the layout will be changed to:
  //
  // +----------------+       +--------------------+
  // | primary_id     | <---- | non_primary_ids[0] |
  // +----------------+       +--------------------+
  //      |
  //      V
  // +------------------------+
  // | non_primary_ids[1] (P) |
  // +------------------------+
  {
    const display::DisplayLayout& current_layout =
        display_manager()->GetCurrentDisplayLayout();
    EXPECT_EQ(non_primary_ids[1], current_layout.primary_id);
    ASSERT_EQ(2u, current_layout.placement_list.size());
    EXPECT_EQ(primary_id, current_layout.placement_list[0].display_id);
    EXPECT_EQ(non_primary_ids[1],
              current_layout.placement_list[0].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::TOP,
              current_layout.placement_list[0].position);
    EXPECT_EQ(non_primary_ids[0], current_layout.placement_list[1].display_id);
    EXPECT_EQ(primary_id, current_layout.placement_list[1].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::RIGHT,
              current_layout.placement_list[1].position);
  }
}

TEST_F(WindowTreeHostManagerTest, SetPrimaryWithFourDisplays) {
  UpdateDisplay("600x500,500x400,400x300,300x200");
  int64_t primary_id = display::Screen::GetScreen()->GetPrimaryDisplay().id();
  display::DisplayIdList non_primary_ids =
      display_manager()->GetCurrentDisplayIdList();
  auto itr =
      std::remove(non_primary_ids.begin(), non_primary_ids.end(), primary_id);
  ASSERT_TRUE(itr != non_primary_ids.end());
  non_primary_ids.erase(itr, non_primary_ids.end());
  ASSERT_EQ(3u, non_primary_ids.size());

  // Build the following layout:
  //
  // +--------------------+   +--------------------+   +--------------------+
  // |                    |   | primary_id (P)     |   |                    |
  // |                    |   +--------------------+   |                    |
  // |                    |             ^              |                    |
  // | non_primary_ids[1] |             |              | non_primary_ids[2] |
  // |                    |   +--------------------+   |                    |
  // |                    |-->| non_primary_ids[0] |<--|                    |
  // +--------------------+   +--------------------+   +--------------------+
  display::DisplayLayoutBuilder builder(primary_id);
  builder.AddDisplayPlacement(non_primary_ids[0], primary_id,
                              display::DisplayPlacement::BOTTOM, 0);
  builder.AddDisplayPlacement(non_primary_ids[1], non_primary_ids[0],
                              display::DisplayPlacement::LEFT, 0);
  builder.AddDisplayPlacement(non_primary_ids[2], non_primary_ids[0],
                              display::DisplayPlacement::RIGHT, 0);
  display_manager()->SetLayoutForCurrentDisplays(builder.Build());

  EXPECT_EQ(primary_id, display::Screen::GetScreen()->GetPrimaryDisplay().id());
  WindowTreeHostManager* window_tree_host_manager =
      Shell::Get()->window_tree_host_manager();

  // Make non_primary_ids[2] primary.
  window_tree_host_manager->SetPrimaryDisplayId(non_primary_ids[2]);
  EXPECT_EQ(non_primary_ids[2],
            display::Screen::GetScreen()->GetPrimaryDisplay().id());

  // Expect that the layout will be changed to:
  //
  // +--------------------+   +--------------------+   +--------------------+
  // |                    |   | primary_id         |   |                    |
  // |                    |   +--------------------+   |                    |
  // |                    |             |              |                    |
  // | non_primary_ids[1] |             V              | non_primary_ids[2] |
  // |                    |   +--------------------+   |        (P)         |
  // |                    |-->| non_primary_ids[0] |-->|                    |
  // +--------------------+   +--------------------+   +--------------------+
  {
    const display::DisplayLayout& current_layout =
        display_manager()->GetCurrentDisplayLayout();
    EXPECT_EQ(non_primary_ids[2], current_layout.primary_id);
    ASSERT_EQ(3u, current_layout.placement_list.size());
    EXPECT_EQ(primary_id, current_layout.placement_list[0].display_id);
    EXPECT_EQ(non_primary_ids[0],
              current_layout.placement_list[0].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::TOP,
              current_layout.placement_list[0].position);
    EXPECT_EQ(non_primary_ids[0], current_layout.placement_list[1].display_id);
    EXPECT_EQ(non_primary_ids[2],
              current_layout.placement_list[1].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::LEFT,
              current_layout.placement_list[1].position);
    EXPECT_EQ(non_primary_ids[1], current_layout.placement_list[2].display_id);
    EXPECT_EQ(non_primary_ids[0],
              current_layout.placement_list[2].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::LEFT,
              current_layout.placement_list[2].position);
  }

  // Make non_primary_ids[1] primary.
  window_tree_host_manager->SetPrimaryDisplayId(non_primary_ids[1]);
  EXPECT_EQ(non_primary_ids[1],
            display::Screen::GetScreen()->GetPrimaryDisplay().id());

  // Expect that the layout will be changed to:
  //
  // +--------------------+   +--------------------+   +--------------------+
  // |                    |   | primary_id         |   |                    |
  // |                    |   +--------------------+   |                    |
  // |                    |             |              |                    |
  // | non_primary_ids[1] |             V              | non_primary_ids[2] |
  // |       (P)          |   +--------------------+   |                    |
  // |                    |<--| non_primary_ids[0] |<--|                    |
  // +--------------------+   +--------------------+   +--------------------+
  {
    const display::DisplayLayout& current_layout =
        display_manager()->GetCurrentDisplayLayout();
    EXPECT_EQ(non_primary_ids[1], current_layout.primary_id);
    ASSERT_EQ(3u, current_layout.placement_list.size());
    EXPECT_EQ(primary_id, current_layout.placement_list[0].display_id);
    EXPECT_EQ(non_primary_ids[0],
              current_layout.placement_list[0].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::TOP,
              current_layout.placement_list[0].position);
    EXPECT_EQ(non_primary_ids[0], current_layout.placement_list[1].display_id);
    EXPECT_EQ(non_primary_ids[1],
              current_layout.placement_list[1].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::RIGHT,
              current_layout.placement_list[1].position);
    EXPECT_EQ(non_primary_ids[2], current_layout.placement_list[2].display_id);
    EXPECT_EQ(non_primary_ids[0],
              current_layout.placement_list[2].parent_display_id);
    EXPECT_EQ(display::DisplayPlacement::RIGHT,
              current_layout.placement_list[2].position);
  }
}

// Tests that SetPrimaryDisplayId updates the Window Service client.
TEST_F(WindowTreeHostManagerTest, SetPrimaryDisplayIdUpdateWSClientDisplayId) {
  // Create two displays.
  UpdateDisplay("200x200,300x300");
  ASSERT_EQ(2200000000, display::Screen::GetScreen()->GetPrimaryDisplay().id());
  int64_t non_primary_display_id =
      display_manager()->GetSecondaryDisplay().id();
  ASSERT_EQ(2200000001, non_primary_display_id);

  std::vector<ws::Change>* ws_client_changes =
      GetTestWindowTreeClient()->tracker()->changes();

  // Create the first window (0,1) on primary display 2200000000.
  ws_client_changes->clear();
  std::unique_ptr<aura::Window> window_in_primary =
      CreateTestWindow(gfx::Rect(0, 0, 10, 20));
  auto iter = FirstChangeOfType(*ws_client_changes,
                                ws::CHANGE_TYPE_ON_TOP_LEVEL_CREATED);
  ASSERT_NE(iter, ws_client_changes->end());
  ASSERT_EQ(1, static_cast<int>(iter->window_id));
  ASSERT_EQ(2200000000, iter->display_id);

  // Create the second window (0,2) on non-primary display 2200000001.
  ws_client_changes->clear();
  std::unique_ptr<aura::Window> window_in_non_primary =
      CreateTestWindow(gfx::Rect(300, 0, 30, 40));
  iter = FirstChangeOfType(*ws_client_changes,
                           ws::CHANGE_TYPE_ON_TOP_LEVEL_CREATED);
  ASSERT_NE(iter, ws_client_changes->end());
  ASSERT_EQ(2, static_cast<int>(iter->window_id));
  ASSERT_EQ(2200000001, iter->display_id);

  // Set primary display id to the non-primary 2200000001. This triggers
  // swapping of WindowTreeHosts and client should receive updates about the
  // display id change.
  ws_client_changes->clear();
  Shell::Get()->window_tree_host_manager()->SetPrimaryDisplayId(
      non_primary_display_id);
  EXPECT_TRUE(
      ContainsChange(*ws_client_changes,
                     "DisplayChanged window_id=0,1 display_id=2200000001"));
  EXPECT_TRUE(
      ContainsChange(*ws_client_changes,
                     "DisplayChanged window_id=0,2 display_id=2200000000"));
}

TEST_F(WindowTreeHostManagerTest, OverscanInsets) {
  WindowTreeHostManager* window_tree_host_manager =
      Shell::Get()->window_tree_host_manager();
  TestEventHandler event_handler;
  Shell::Get()->AddPreTargetHandler(&event_handler);

  UpdateDisplay("120x200,300x400*2");
  display::Display display1 = display::Screen::GetScreen()->GetPrimaryDisplay();
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();

  window_tree_host_manager->SetOverscanInsets(display1.id(),
                                              gfx::Insets(10, 15, 20, 25));
  EXPECT_EQ("0,0 80x170", root_windows[0]->bounds().ToString());
  EXPECT_EQ("150x200", root_windows[1]->bounds().size().ToString());
  EXPECT_EQ("80,0 150x200",
            display_manager()->GetSecondaryDisplay().bounds().ToString());

  ui::test::EventGenerator generator(root_windows[0]);
  generator.MoveMouseToInHost(20, 25);
  EXPECT_EQ("5,15", event_handler.GetLocationAndReset());

  window_tree_host_manager->SetOverscanInsets(display1.id(), gfx::Insets());
  EXPECT_EQ("0,0 120x200", root_windows[0]->bounds().ToString());
  EXPECT_EQ("120,0 150x200",
            display_manager()->GetSecondaryDisplay().bounds().ToString());

  generator.MoveMouseToInHost(30, 20);
  EXPECT_EQ("30,20", event_handler.GetLocationAndReset());

  // Make sure the root window transformer uses correct scale
  // factor when swapping display. Test crbug.com/253690.
  UpdateDisplay("400x300*2,600x400/o");
  root_windows = Shell::GetAllRootWindows();
  gfx::Point point;
  Shell::GetAllRootWindows()[1]->GetHost()->GetRootTransform().TransformPoint(
      &point);
  EXPECT_EQ("15,10", point.ToString());

  SwapPrimaryDisplay();
  point.SetPoint(0, 0);
  Shell::GetAllRootWindows()[1]->GetHost()->GetRootTransform().TransformPoint(
      &point);
  EXPECT_EQ("15,10", point.ToString());

  Shell::Get()->RemovePreTargetHandler(&event_handler);
}

TEST_F(WindowTreeHostManagerTest, Rotate) {
  TestEventHandler event_handler;
  Shell::Get()->AddPreTargetHandler(&event_handler);

  UpdateDisplay("120x200,300x400*2");
  display::Display display1 = display::Screen::GetScreen()->GetPrimaryDisplay();
  int64_t display2_id = display_manager()->GetSecondaryDisplay().id();
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
  ui::test::EventGenerator generator1(root_windows[0]);

  TestObserver observer;
  EXPECT_EQ("120x200", root_windows[0]->bounds().size().ToString());
  EXPECT_EQ("150x200", root_windows[1]->bounds().size().ToString());
  EXPECT_EQ("120,0 150x200",
            display_manager()->GetSecondaryDisplay().bounds().ToString());
  generator1.MoveMouseToInHost(50, 40);
  EXPECT_EQ("50,40", event_handler.GetLocationAndReset());
  EXPECT_EQ(display::Display::ROTATE_0,
            GetActiveDisplayRotation(display1.id()));
  EXPECT_EQ(display::Display::ROTATE_0, GetActiveDisplayRotation(display2_id));
  EXPECT_EQ(0, observer.GetRotationChangedCountAndReset());

  display_manager()->SetDisplayRotation(
      display1.id(), display::Display::ROTATE_90,
      display::Display::RotationSource::ACTIVE);
  EXPECT_EQ("200x120", root_windows[0]->bounds().size().ToString());
  EXPECT_EQ("150x200", root_windows[1]->bounds().size().ToString());
  EXPECT_EQ("200,0 150x200",
            display_manager()->GetSecondaryDisplay().bounds().ToString());
  generator1.MoveMouseToInHost(50, 40);
  EXPECT_EQ("40,70", event_handler.GetLocationAndReset());
  EXPECT_EQ(display::Display::ROTATE_90,
            GetActiveDisplayRotation(display1.id()));
  EXPECT_EQ(display::Display::ROTATE_0, GetActiveDisplayRotation(display2_id));
  EXPECT_EQ(1, observer.GetRotationChangedCountAndReset());

  display_manager()->SetLayoutForCurrentDisplays(
      display::test::CreateDisplayLayout(
          display_manager(), display::DisplayPlacement::BOTTOM, 50));
  EXPECT_EQ("50,120 150x200",
            display_manager()->GetSecondaryDisplay().bounds().ToString());

  display_manager()->SetDisplayRotation(
      display2_id, display::Display::ROTATE_270,
      display::Display::RotationSource::ACTIVE);
  EXPECT_EQ("200x120", root_windows[0]->bounds().size().ToString());
  EXPECT_EQ("200x150", root_windows[1]->bounds().size().ToString());
  EXPECT_EQ("50,120 200x150",
            display_manager()->GetSecondaryDisplay().bounds().ToString());
  EXPECT_EQ(display::Display::ROTATE_90,
            GetActiveDisplayRotation(display1.id()));
  EXPECT_EQ(display::Display::ROTATE_270,
            GetActiveDisplayRotation(display2_id));
  EXPECT_EQ(1, observer.GetRotationChangedCountAndReset());

  ui::test::EventGenerator generator2(root_windows[1]);
  generator2.MoveMouseToInHost(50, 40);
  EXPECT_EQ("180,25", event_handler.GetLocationAndReset());
  display_manager()->SetDisplayRotation(
      display1.id(), display::Display::ROTATE_180,
      display::Display::RotationSource::ACTIVE);

  EXPECT_EQ("120x200", root_windows[0]->bounds().size().ToString());
  EXPECT_EQ("200x150", root_windows[1]->bounds().size().ToString());
  // Dislay must share at least 100, so the x's offset becomes 20.
  EXPECT_EQ("20,200 200x150",
            display_manager()->GetSecondaryDisplay().bounds().ToString());
  EXPECT_EQ(display::Display::ROTATE_180,
            GetActiveDisplayRotation(display1.id()));
  EXPECT_EQ(display::Display::ROTATE_270,
            GetActiveDisplayRotation(display2_id));
  EXPECT_EQ(1, observer.GetRotationChangedCountAndReset());

  generator1.MoveMouseToInHost(50, 40);
  EXPECT_EQ("70,160", event_handler.GetLocationAndReset());

  Shell::Get()->RemovePreTargetHandler(&event_handler);
}

TEST_F(WindowTreeHostManagerTest, ScaleRootWindow) {
  TestEventHandler event_handler;
  Shell::Get()->AddPreTargetHandler(&event_handler);

  UpdateDisplay("600x400*1.6,500x300");

  display::Display display1 = display::Screen::GetScreen()->GetPrimaryDisplay();
  display::test::ScopedSetInternalDisplayId set_internal(display_manager(),
                                                         display1.id());

  display::Display display2 = display_manager()->GetSecondaryDisplay();
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
  EXPECT_EQ("0,0 375x250", display1.bounds().ToString());
  EXPECT_EQ("0,0 375x250", root_windows[0]->bounds().ToString());
  EXPECT_EQ("375,0 500x300", display2.bounds().ToString());
  EXPECT_FLOAT_EQ(1.0f, GetStoredZoomScale(display1.id()));
  EXPECT_FLOAT_EQ(1.0f, GetStoredZoomScale(display2.id()));

  ui::test::EventGenerator generator(root_windows[0]);
  generator.MoveMouseToInHost(599, 200);
  EXPECT_EQ("374,125", event_handler.GetLocationAndReset());

  display_manager()->UpdateZoomFactor(display1.id(), 1.f / 1.2f);
  display1 = display::Screen::GetScreen()->GetPrimaryDisplay();
  display2 = display_manager()->GetSecondaryDisplay();
  EXPECT_EQ("0,0 450x300", display1.bounds().ToString());
  EXPECT_EQ("0,0 450x300", root_windows[0]->bounds().ToString());
  EXPECT_EQ("450,0 500x300", display2.bounds().ToString());
  EXPECT_FLOAT_EQ(1.f / 1.2f, GetStoredZoomScale(display1.id()));
  EXPECT_FLOAT_EQ(1.0f, GetStoredZoomScale(display2.id()));

  Shell::Get()->RemovePreTargetHandler(&event_handler);
}

TEST_F(WindowTreeHostManagerTest, TouchScale) {
  TestEventHandler event_handler;
  Shell::Get()->AddPreTargetHandler(&event_handler);

  UpdateDisplay("200x200*2");
  display::Display display = display::Screen::GetScreen()->GetPrimaryDisplay();
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
  aura::Window* root_window = root_windows[0];
  ui::test::EventGenerator generator(root_window);

  generator.PressMoveAndReleaseTouchTo(50, 50);
  // Default test touches have radius_x/y = 1.0, with device scale
  // factor = 2, the scaled radius_x/y should be 0.5.
  EXPECT_EQ(0.5, event_handler.touch_radius_x());
  EXPECT_EQ(0.5, event_handler.touch_radius_y());

  generator.ScrollSequence(gfx::Point(0, 0),
                           base::TimeDelta::FromMilliseconds(100), 10.0, 1.0, 5,
                           1);

  // ordinal_offset is invariant to the device scale factor.
  EXPECT_EQ(event_handler.scroll_x_offset(),
            event_handler.scroll_x_offset_ordinal());
  EXPECT_EQ(event_handler.scroll_y_offset(),
            event_handler.scroll_y_offset_ordinal());

  Shell::Get()->RemovePreTargetHandler(&event_handler);
}

TEST_F(WindowTreeHostManagerTest, ConvertHostToRootCoords) {
  TestEventHandler event_handler;
  Shell::Get()->AddPreTargetHandler(&event_handler);

  UpdateDisplay("600x400*2/r@0.8");

  display::Display display1 = display::Screen::GetScreen()->GetPrimaryDisplay();
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();
  EXPECT_EQ("0,0 250x375", display1.bounds().ToString());
  EXPECT_EQ("0,0 250x375", root_windows[0]->bounds().ToString());
  EXPECT_EQ(0.8f, GetStoredZoomScale(display1.id()));

  ui::test::EventGenerator generator(root_windows[0]);
  generator.MoveMouseToInHost(0, 0);
  // The mouse location must be inside the root bounds in dp.
  EXPECT_EQ("0,374", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(599, 0);
  EXPECT_EQ("0,0", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(599, 399);
  EXPECT_EQ("249,0", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(0, 399);
  EXPECT_EQ("249,374", event_handler.GetLocationAndReset());

  UpdateDisplay("600x400*2/u@0.8");
  display1 = display::Screen::GetScreen()->GetPrimaryDisplay();
  root_windows = Shell::GetAllRootWindows();
  EXPECT_EQ("0,0 375x250", display1.bounds().ToString());
  EXPECT_EQ("0,0 375x250", root_windows[0]->bounds().ToString());
  EXPECT_EQ(0.8f, GetStoredZoomScale(display1.id()));

  generator.MoveMouseToInHost(0, 0);
  EXPECT_EQ("374,249", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(599, 0);
  EXPECT_EQ("0,249", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(599, 399);
  EXPECT_EQ("0,0", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(0, 399);
  EXPECT_EQ("374,0", event_handler.GetLocationAndReset());

  UpdateDisplay("600x400*2/l@0.8");
  display1 = display::Screen::GetScreen()->GetPrimaryDisplay();
  root_windows = Shell::GetAllRootWindows();
  EXPECT_EQ("0,0 250x375", display1.bounds().ToString());
  EXPECT_EQ("0,0 250x375", root_windows[0]->bounds().ToString());
  EXPECT_EQ(0.8f, GetStoredZoomScale(display1.id()));

  generator.MoveMouseToInHost(0, 0);
  EXPECT_EQ("249,0", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(599, 0);
  EXPECT_EQ("249,374", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(599, 399);
  EXPECT_EQ("0,374", event_handler.GetLocationAndReset());
  generator.MoveMouseToInHost(0, 399);
  EXPECT_EQ("0,0", event_handler.GetLocationAndReset());

  Shell::Get()->RemovePreTargetHandler(&event_handler);
}

// Make sure that the compositor based mirroring can switch
// from/to dock mode.
TEST_F(WindowTreeHostManagerTest, DockToSingle) {
  const int64_t internal_id = 1;

  const display::ManagedDisplayInfo internal_display_info =
      CreateDisplayInfo(internal_id, 0, display::Display::ROTATE_0);
  const display::ManagedDisplayInfo external_display_info =
      CreateDisplayInfo(2, 1, display::Display::ROTATE_90);

  std::vector<display::ManagedDisplayInfo> display_info_list;
  // Extended
  display_info_list.push_back(internal_display_info);
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  const int64_t internal_display_id =
      display::test::DisplayManagerTestApi(display_manager())
          .SetFirstDisplayAsInternalDisplay();
  EXPECT_EQ(internal_id, internal_display_id);
  EXPECT_EQ(2U, display_manager()->GetNumDisplays());

  // Dock mode.
  display_info_list.clear();
  display_info_list.push_back(external_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
  EXPECT_FALSE(Shell::GetPrimaryRootWindow()
                   ->GetHost()
                   ->GetRootTransform()
                   .IsIdentityOrIntegerTranslation());

  // Switch to single mode and make sure the transform is the one
  // for the internal display.
  display_info_list.clear();
  display_info_list.push_back(internal_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_TRUE(Shell::GetPrimaryRootWindow()
                  ->GetHost()
                  ->GetRootTransform()
                  .IsIdentityOrIntegerTranslation());
}

// Tests if switching two displays at the same time while the primary display
// is swapped should not cause a crash. (crbug.com/426292)
TEST_F(WindowTreeHostManagerTest, ReplaceSwappedPrimary) {
  const display::ManagedDisplayInfo first_display_info =
      CreateDisplayInfo(10, 0, display::Display::ROTATE_0);
  const display::ManagedDisplayInfo second_display_info =
      CreateDisplayInfo(11, 1, display::Display::ROTATE_0);

  std::vector<display::ManagedDisplayInfo> display_info_list;
  // Extended
  display_info_list.push_back(first_display_info);
  display_info_list.push_back(second_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);

  SwapPrimaryDisplay();

  EXPECT_EQ(11, display::Screen::GetScreen()->GetPrimaryDisplay().id());

  display_info_list.clear();
  const display::ManagedDisplayInfo new_first_display_info =
      CreateDisplayInfo(20, 0, display::Display::ROTATE_0);
  const display::ManagedDisplayInfo new_second_display_info =
      CreateDisplayInfo(21, 1, display::Display::ROTATE_0);
  display_info_list.push_back(new_first_display_info);
  display_info_list.push_back(new_second_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);

  EXPECT_EQ(20, display::Screen::GetScreen()->GetPrimaryDisplay().id());
}

namespace {

class RootWindowTestObserver : public aura::WindowObserver {
 public:
  RootWindowTestObserver() = default;
  ~RootWindowTestObserver() override = default;

  void OnWindowBoundsChanged(aura::Window* window,
                             const gfx::Rect& old_bounds,
                             const gfx::Rect& new_bounds,
                             ui::PropertyChangeReason reason) override {
    shelf_display_bounds_ = screen_util::GetDisplayBoundsWithShelf(window);
  }

  const gfx::Rect& shelf_display_bounds() const {
    return shelf_display_bounds_;
  }

 private:
  gfx::Rect shelf_display_bounds_;

  DISALLOW_COPY_AND_ASSIGN(RootWindowTestObserver);
};

}  // names

// Make sure that GetDisplayBoundsWithShelf returns the correct bounds
// when the primary display gets replaced in one of the following scenarios:
// 1) Two displays connected: a) b)
// 2) both are disconnected and new one with the same size as b) is connected
// in one configuration event.
// See crbug.com/547280.
TEST_F(WindowTreeHostManagerTest, ReplacePrimary) {
  display::ManagedDisplayInfo first_display_info =
      CreateDisplayInfo(10, 0, display::Display::ROTATE_0);
  first_display_info.SetBounds(gfx::Rect(0, 0, 400, 400));
  const display::ManagedDisplayInfo second_display_info =
      CreateDisplayInfo(11, 500, display::Display::ROTATE_0);

  std::vector<display::ManagedDisplayInfo> display_info_list;
  // Extended
  display_info_list.push_back(first_display_info);
  display_info_list.push_back(second_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  aura::Window* primary_root = Shell::GetAllRootWindows()[0];

  int64_t new_display_id = 20;
  RootWindowTestObserver test_observer;
  primary_root->AddObserver(&test_observer);

  display_info_list.clear();
  const display::ManagedDisplayInfo new_first_display_info =
      CreateDisplayInfo(new_display_id, 0, display::Display::ROTATE_0);

  display_info_list.push_back(new_first_display_info);
  display_manager()->OnNativeDisplaysChanged(display_info_list);
  EXPECT_EQ("0,0 500x500", test_observer.shelf_display_bounds().ToString());
  primary_root->RemoveObserver(&test_observer);
}

TEST_F(WindowTreeHostManagerTest, UpdateMouseLocationAfterDisplayChange) {
  UpdateDisplay("200x200,300x300");
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();

  aura::Env* env = Shell::Get()->aura_env();

  ui::test::EventGenerator generator_on_2nd(root_windows[1]);

  // Set the initial position.
  generator_on_2nd.MoveMouseToInHost(150, 150);
  EXPECT_EQ("350,150", env->last_mouse_location().ToString());

  // A mouse pointer will stay in the 2nd display.
  UpdateDisplay("300x300,200x200");
  EXPECT_EQ("450,50", env->last_mouse_location().ToString());

  // A mouse pointer will be outside of displays and move to the
  // center of 2nd display.
  UpdateDisplay("300x300,100x100");
  EXPECT_EQ("350,50", env->last_mouse_location().ToString());

  // 2nd display was disconnected, and the cursor is
  // now in the 1st display.
  UpdateDisplay("400x400");
  EXPECT_EQ("50,350", env->last_mouse_location().ToString());

  // 1st display's resolution has changed, and the mouse pointer is
  // now outside. Move the mouse pointer to the center of 1st display.
  UpdateDisplay("300x300");
  EXPECT_EQ("150,150", env->last_mouse_location().ToString());

  // Move the mouse pointer to the bottom of 1st display.
  ui::test::EventGenerator generator_on_1st(root_windows[0]);
  generator_on_1st.MoveMouseToInHost(150, 290);
  EXPECT_EQ("150,290", env->last_mouse_location().ToString());

  // The mouse pointer is now on 2nd display.
  UpdateDisplay("300x280,200x200");
  EXPECT_EQ("450,10", env->last_mouse_location().ToString());
}

TEST_F(WindowTreeHostManagerTest,
       DontUpdateInvisibleCursorLocationAfterDisplayChange) {
  UpdateDisplay("500x300");
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();

  aura::Env* env = Shell::Get()->aura_env();

  ui::test::EventGenerator generator(root_windows[0]);

  // Logical cursor location is updated to keep the same physical location.
  generator.MoveMouseToInHost(350, 150);
  EXPECT_EQ("350,150", env->last_mouse_location().ToString());

  UpdateDisplay("300x500/r");
  EXPECT_EQ("250,150", env->last_mouse_location().ToString());

  // Logical cursor location change shouldn't change when the cursor isn't
  // visible.
  UpdateDisplay("500x300");
  generator.MoveMouseToInHost(350, 150);
  EXPECT_EQ("350,150", env->last_mouse_location().ToString());

  Shell::Get()->cursor_manager()->HideCursor();
  UpdateDisplay("300x500/r");
  EXPECT_EQ("350,150", env->last_mouse_location().ToString());
}

TEST_F(WindowTreeHostManagerTest,
       UpdateMouseLocationAfterDisplayChange_2ndOnLeft) {
  // Set the 2nd display on the left.
  display::DisplayLayoutStore* layout_store = display_manager()->layout_store();
  display::DisplayPlacement new_default(display::DisplayPlacement::LEFT, 0);
  layout_store->SetDefaultDisplayPlacement(new_default);

  UpdateDisplay("200x200,300x300");
  aura::Window::Windows root_windows = Shell::GetAllRootWindows();

  EXPECT_EQ("-300,0 300x300",
            display_manager()->GetSecondaryDisplay().bounds().ToString());

  aura::Env* env = Shell::Get()->aura_env();

  // Set the initial position.
  root_windows[0]->MoveCursorTo(gfx::Point(-150, 250));
  EXPECT_EQ("-150,250", env->last_mouse_location().ToString());

  // A mouse pointer will stay in 2nd display.
  UpdateDisplay("300x300,200x300");
  EXPECT_EQ("-50,150", env->last_mouse_location().ToString());

  // A mouse pointer will be outside of displays and move to the
  // center of 2nd display.
  UpdateDisplay("300x300,200x100");
  EXPECT_EQ("-100,50", env->last_mouse_location().ToString());

  // 2nd display was disconnected. Mouse pointer should move to
  // 1st display.
  UpdateDisplay("300x300");
  EXPECT_EQ("150,150", env->last_mouse_location().ToString());
}

// Test that the cursor swaps displays and that its scale factor and rotation
// are updated when the primary display is swapped.
TEST_F(WindowTreeHostManagerTest,
       UpdateMouseLocationAfterDisplayChange_SwapPrimary) {
  UpdateDisplay("200x200,200x200*2/r");

  aura::Env* env = Shell::Get()->aura_env();
  Shell* shell = Shell::Get();
  WindowTreeHostManager* window_tree_host_manager =
      shell->window_tree_host_manager();
  CursorManagerTestApi test_api(shell->cursor_manager());

  window_tree_host_manager->GetPrimaryRootWindow()->MoveCursorTo(
      gfx::Point(20, 50));

  EXPECT_EQ("20,50", env->last_mouse_location().ToString());
  EXPECT_EQ(1.0f, test_api.GetCurrentCursor().device_scale_factor());
  EXPECT_EQ(display::Display::ROTATE_0, test_api.GetCurrentCursorRotation());

  SwapPrimaryDisplay();

  EXPECT_EQ("20,50", env->last_mouse_location().ToString());
  EXPECT_EQ(2.0f, test_api.GetCurrentCursor().device_scale_factor());
  EXPECT_EQ(display::Display::ROTATE_90, test_api.GetCurrentCursorRotation());
}

// Test that the cursor moves to the other display and that its scale factor
// and rotation are updated when the primary display is disconnected.
TEST_F(WindowTreeHostManagerTest,
       UpdateMouseLocationAfterDisplayChange_PrimaryDisconnected) {
  aura::Env* env = Shell::Get()->aura_env();
  Shell* shell = Shell::Get();
  WindowTreeHostManager* window_tree_host_manager =
      shell->window_tree_host_manager();
  CursorManagerTestApi test_api(shell->cursor_manager());

  UpdateDisplay("300x300*2/r,200x200");
  // Swap the primary display to make it possible to remove the primary display
  // via UpdateDisplay().
  SwapPrimaryDisplay();
  int primary_display_id = window_tree_host_manager->GetPrimaryDisplayId();

  window_tree_host_manager->GetPrimaryRootWindow()->MoveCursorTo(
      gfx::Point(20, 50));

  EXPECT_EQ("20,50", env->last_mouse_location().ToString());
  EXPECT_EQ(1.0f, test_api.GetCurrentCursor().device_scale_factor());
  EXPECT_EQ(display::Display::ROTATE_0, test_api.GetCurrentCursorRotation());

  UpdateDisplay("300x300*2/r");
  ASSERT_NE(primary_display_id,
            window_tree_host_manager->GetPrimaryDisplayId());

  // Cursor should be centered on the remaining display.
  EXPECT_EQ("75,75", env->last_mouse_location().ToString());
  EXPECT_EQ(2.0f, test_api.GetCurrentCursor().device_scale_factor());
  EXPECT_EQ(display::Display::ROTATE_90, test_api.GetCurrentCursorRotation());
}

TEST_F(WindowTreeHostManagerTest,
       UpdateNonVisibleMouseLocationAfterDisplayChange_PrimaryDisconnected) {
  aura::Env* env = Shell::Get()->aura_env();
  Shell* shell = Shell::Get();
  WindowTreeHostManager* window_tree_host_manager =
      shell->window_tree_host_manager();
  CursorManagerTestApi test_api(shell->cursor_manager());

  UpdateDisplay("300x300*2/r,200x200");
  // Swap the primary display to make it possible to remove the primary display
  // via UpdateDisplay().
  SwapPrimaryDisplay();
  int primary_display_id = window_tree_host_manager->GetPrimaryDisplayId();
  gfx::Point cursor_location(20, 50);

  window_tree_host_manager->GetPrimaryRootWindow()->MoveCursorTo(
      cursor_location);

  // Hide cursor before disconnecting the display.
  shell->cursor_manager()->HideCursor();

  EXPECT_EQ(cursor_location, env->last_mouse_location());
  EXPECT_EQ(1.0f, test_api.GetCurrentCursor().device_scale_factor());
  EXPECT_EQ(display::Display::ROTATE_0, test_api.GetCurrentCursorRotation());

  UpdateDisplay("300x300*2/r");
  ASSERT_NE(primary_display_id,
            window_tree_host_manager->GetPrimaryDisplayId());

  // Show the mouse cursor before checking properties which should be as if the
  // mouse cursor was never hidden.
  shell->cursor_manager()->ShowCursor();

  // The cursor will not be centered since it was hidden when the display list
  // was updated.
  EXPECT_EQ(gfx::Point(20, 50), env->last_mouse_location());

  // The cursor scale and rotation should be updated.
  EXPECT_EQ(2.0f, test_api.GetCurrentCursor().device_scale_factor());
  EXPECT_EQ(display::Display::ROTATE_90, test_api.GetCurrentCursorRotation());
}

// GetRootWindowForDisplayId() for removed display::Display during
// OnDisplayRemoved() should not cause crash. See http://crbug.com/415222
TEST_F(WindowTreeHostManagerTest,
       GetRootWindowForDisplayIdDuringDisplayDisconnection) {
  UpdateDisplay("300x300,200x200");
  aura::Window* root2 =
      Shell::Get()->window_tree_host_manager()->GetRootWindowForDisplayId(
          display_manager()->GetSecondaryDisplay().id());
  views::Widget* widget = views::Widget::CreateWindowWithContextAndBounds(
      nullptr, root2, gfx::Rect(350, 0, 100, 100));
  views::View* view = new views::View();
  widget->GetContentsView()->AddChildView(view);
  view->SetBounds(0, 0, 100, 100);
  widget->Show();

  TestMouseWatcherListener listener;
  views::MouseWatcher watcher(
      std::make_unique<views::MouseWatcherViewHost>(view, gfx::Insets()),
      &listener);
  watcher.Start(root2);

  ui::test::EventGenerator event_generator(
      widget->GetNativeWindow()->GetRootWindow());
  event_generator.MoveMouseToCenterOf(widget->GetNativeWindow());

  UpdateDisplay("300x300");
  watcher.Stop();

  widget->CloseNow();
}

TEST_F(WindowTreeHostManagerTest, KeyEventFromSecondaryDisplay) {
  UpdateDisplay("300x300,200x200");
  ui::KeyEvent key_event(ui::ET_KEY_PRESSED, ui::VKEY_RETURN, 0);
  ui::Event::DispatcherApi dispatcher_api(&key_event);
  // Set the target to the second display. WindowTreeHostManager will end up
  // targeting the primary display.
  dispatcher_api.set_target(
      Shell::Get()->window_tree_host_manager()->GetRootWindowForDisplayId(
          GetSecondaryDisplay().id()));
  Shell::Get()->window_tree_host_manager()->DispatchKeyEventPostIME(
      &key_event, base::NullCallback());
  // As long as nothing crashes, we're good.
}

}  // namespace ash