Separate projection mode from rest of touch HUD

ash/touch/touch_observer_hud.cc

Index: ash/touch/touch_observer_hud.cc
diff --git a/ash/touch/touch_observer_hud.cc b/ash/touch/touch_observer_hud.cc
index 135da1a08934fcb53acf6abc3a344aba4ecb17ef..ceb87fd83924ba7261d926fdc5a3fdd3c9b364d9 100644
--- a/ash/touch/touch_observer_hud.cc
+++ b/ash/touch/touch_observer_hud.cc
@@ -4,496 +4,40 @@
 
 #include "ash/touch/touch_observer_hud.h"
 
-#include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
+#include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/property_util.h"
-#include "base/json/json_string_value_serializer.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/stringprintf.h"
-#include "base/strings/utf_string_conversions.h"
-#include "third_party/skia/include/core/SkPath.h"
-#include "third_party/skia/include/core/SkXfermode.h"
-#include "third_party/skia/include/effects/SkGradientShader.h"
 #include "ui/aura/root_window.h"
-#include "ui/aura/window.h"
-#include "ui/base/animation/animation_delegate.h"
-#include "ui/base/animation/linear_animation.h"
-#include "ui/base/events/event.h"
-#include "ui/gfx/canvas.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/screen.h"
 #include "ui/gfx/size.h"
-#include "ui/gfx/transform.h"
-#include "ui/views/background.h"
-#include "ui/views/controls/label.h"
-#include "ui/views/layout/box_layout.h"
 #include "ui/views/widget/widget.h"
 
-#if defined(USE_X11)
-#include <X11/extensions/XInput2.h>
-#include <X11/Xlib.h>
-
-#include "ui/base/x/device_data_manager.h"
-#endif
-
 namespace ash {
 namespace internal {
 
-const int kPointRadius = 20;
-const SkColor kColors[] = {
-  SK_ColorYELLOW,
-  SK_ColorGREEN,
-  SK_ColorRED,
-  SK_ColorBLUE,
-  SK_ColorGRAY,
-  SK_ColorMAGENTA,
-  SK_ColorCYAN,
-  SK_ColorWHITE,
-  SK_ColorBLACK,
-  SkColorSetRGB(0xFF, 0x8C, 0x00),
-  SkColorSetRGB(0x8B, 0x45, 0x13),
-  SkColorSetRGB(0xFF, 0xDE, 0xAD),
-};
-const int kAlpha = 0x60;
-const SkColor kProjectionFillColor = SkColorSetRGB(0xF5, 0xF5, 0xDC);
-const SkColor kProjectionStrokeColor = SK_ColorGRAY;
-const int kProjectionAlpha = 0xB0;
-const int kMaxPaths = arraysize(kColors);
-const int kReducedScale = 10;
-const int kFadeoutDurationInMs = 250;
-const int kFadeoutFrameRate = 60;
-
-const char* GetTouchEventLabel(ui::EventType type) {
-  switch (type) {
-    case ui::ET_UNKNOWN:
-      return " ";
-    case ui::ET_TOUCH_PRESSED:
-      return "P";
-    case ui::ET_TOUCH_MOVED:
-      return "M";
-    case ui::ET_TOUCH_RELEASED:
-      return "R";
-    case ui::ET_TOUCH_CANCELLED:
-      return "C";
-    default:
-      break;
-  }
-  return "?";
-}
-
-int GetTrackingId(const ui::TouchEvent& event) {
-  if (!event.HasNativeEvent())
-    return 0;
-#if defined(USE_XI2_MT)
-  ui::DeviceDataManager* manager = ui::DeviceDataManager::GetInstance();
-  double tracking_id;
-  if (manager->GetEventData(*event.native_event(),
-                            ui::DeviceDataManager::DT_TOUCH_TRACKING_ID,
-                            &tracking_id)) {
-    return static_cast<int>(tracking_id);
-  }
-#endif
-  return 0;
-}
-
-int GetSourceDeviceId(const ui::TouchEvent& event) {
-  if (!event.HasNativeEvent())
-    return 0;
-#if defined(USE_X11)
-  XEvent* xev = event.native_event();
-  return static_cast<XIDeviceEvent*>(xev->xcookie.data)->sourceid;
-#endif
-  return 0;
-}
-
-// A TouchPointLog represents a single touch-event of a touch point.
-struct TouchPointLog {
- public:
-  explicit TouchPointLog(const ui::TouchEvent& touch)
-      : id(touch.touch_id()),
-        type(touch.type()),
-        location(touch.root_location()),
-        timestamp(touch.time_stamp().InMillisecondsF()),
-        radius_x(touch.radius_x()),
-        radius_y(touch.radius_y()),
-        pressure(touch.force()),
-        tracking_id(GetTrackingId(touch)),
-        source_device(GetSourceDeviceId(touch)) {
-  }
-
-  // Populates a dictionary value with all the information about the touch
-  // point.
-  scoped_ptr<DictionaryValue> GetAsDictionary() const {
-    scoped_ptr<DictionaryValue> value(new DictionaryValue());
-
-    value->SetInteger("id", id);
-    value->SetString("type", std::string(GetTouchEventLabel(type)));
-    value->SetString("location", location.ToString());
-    value->SetDouble("timestamp", timestamp);
-    value->SetDouble("radius_x", radius_x);
-    value->SetDouble("radius_y", radius_y);
-    value->SetDouble("pressure", pressure);
-    value->SetInteger("tracking_id", tracking_id);
-    value->SetInteger("source_device", source_device);
-
-    return value.Pass();
-  }
-
-  int id;
-  ui::EventType type;
-  gfx::Point location;
-  double timestamp;
-  float radius_x;
-  float radius_y;
-  float pressure;
-  int tracking_id;
-  int source_device;
-};
-
-// A TouchTrace keeps track of all the touch events of a single touch point
-// (starting from a touch-press and ending at touch-release).
-class TouchTrace {
- public:
-  typedef std::vector<TouchPointLog>::iterator iterator;
-  typedef std::vector<TouchPointLog>::const_iterator const_iterator;
-  typedef std::vector<TouchPointLog>::reverse_iterator reverse_iterator;
-  typedef std::vector<TouchPointLog>::const_reverse_iterator
-      const_reverse_iterator;
-
-  TouchTrace() {
-  }
-
-  void AddTouchPoint(const ui::TouchEvent& touch) {
-    log_.push_back(TouchPointLog(touch));
-  }
-
-  const std::vector<TouchPointLog>& log() const { return log_; }
-
-  bool active() const {
-    return !log_.empty() && log_.back().type != ui::ET_TOUCH_RELEASED &&
-        log_.back().type != ui::ET_TOUCH_CANCELLED;
-  }
-
-  // Returns a list containing data from all events for the touch point.
-  scoped_ptr<ListValue> GetAsList() const {
-    scoped_ptr<ListValue> list(new ListValue());
-    for (const_iterator i = log_.begin(); i != log_.end(); ++i)
-      list->Append((*i).GetAsDictionary().release());
-    return list.Pass();
-  }
-
-  void Reset() {
-    log_.clear();
-  }
-
- private:
-  std::vector<TouchPointLog> log_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchTrace);
-};
-
-// A TouchLog keeps track of all touch events of all touch points.
-class TouchLog {
- public:
-  TouchLog() : next_trace_index_(0) {
-  }
-
-  void AddTouchPoint(const ui::TouchEvent& touch) {
-    if (touch.type() == ui::ET_TOUCH_PRESSED)
-      StartTrace(touch);
-    AddToTrace(touch);
-  }
-
-  void Reset() {
-    next_trace_index_ = 0;
-    for (int i = 0; i < kMaxPaths; ++i)
-      traces_[i].Reset();
-  }
-
-  scoped_ptr<ListValue> GetAsList() const {
-    scoped_ptr<ListValue> list(new ListValue());
-    for (int i = 0; i < kMaxPaths; ++i) {
-      if (!traces_[i].log().empty())
-        list->Append(traces_[i].GetAsList().release());
-    }
-    return list.Pass();
-  }
-
-  int GetTraceIndex(int touch_id) const {
-    return touch_id_to_trace_index_.at(touch_id);
-  }
-
-  const TouchTrace* traces() const {
-    return traces_;
-  }
-
- private:
-  void StartTrace(const ui::TouchEvent& touch) {
-    // Find the first inactive spot; otherwise, overwrite the one
-    // |next_trace_index_| is pointing to.
-    int old_trace_index = next_trace_index_;
-    do {
-      if (!traces_[next_trace_index_].active())
-        break;
-      next_trace_index_ = (next_trace_index_ + 1) % kMaxPaths;
-    } while (next_trace_index_ != old_trace_index);
-    int touch_id = touch.touch_id();
-    traces_[next_trace_index_].Reset();
-    touch_id_to_trace_index_[touch_id] = next_trace_index_;
-    next_trace_index_ = (next_trace_index_ + 1) % kMaxPaths;
-  }
-
-  void AddToTrace(const ui::TouchEvent& touch) {
-    int touch_id = touch.touch_id();
-    int trace_index = touch_id_to_trace_index_[touch_id];
-    traces_[trace_index].AddTouchPoint(touch);
-  }
-
-  TouchTrace traces_[kMaxPaths];
-  int next_trace_index_;
-
-  std::map<int, int> touch_id_to_trace_index_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchLog);
-};
-
-// TouchHudCanvas draws touch traces in |FULLSCREEN| and |REDUCED_SCALE| modes.
-class TouchHudCanvas : public views::View {
- public:
-  explicit TouchHudCanvas(const TouchLog& touch_log)
-      : touch_log_(touch_log),
-        scale_(1) {
-    SetPaintToLayer(true);
-    SetFillsBoundsOpaquely(false);
-
-    paint_.setStyle(SkPaint::kFill_Style);
-  }
-
-  virtual ~TouchHudCanvas() {}
-
-  void SetScale(int scale) {
-    if (scale_ == scale)
-      return;
-    scale_ = scale;
-    gfx::Transform transform;
-    transform.Scale(1. / scale_, 1. / scale_);
-    layer()->SetTransform(transform);
-  }
-
-  int scale() const { return scale_; }
-
-  void TouchPointAdded(int touch_id) {
-    int trace_index = touch_log_.GetTraceIndex(touch_id);
-    const TouchTrace& trace = touch_log_.traces()[trace_index];
-    const TouchPointLog& point = trace.log().back();
-    if (point.type == ui::ET_TOUCH_PRESSED)
-      StartedTrace(trace_index);
-    if (point.type != ui::ET_TOUCH_CANCELLED)
-      AddedPointToTrace(trace_index);
-  }
-
-  void Clear() {
-    for (int i = 0; i < kMaxPaths; ++i)
-      paths_[i].reset();
-
-    SchedulePaint();
-  }
-
- private:
-  void StartedTrace(int trace_index) {
-    paths_[trace_index].reset();
-    colors_[trace_index] = SkColorSetA(kColors[trace_index], kAlpha);
-  }
-
-  void AddedPointToTrace(int trace_index) {
-    const TouchTrace& trace = touch_log_.traces()[trace_index];
-    const TouchPointLog& point = trace.log().back();
-    const gfx::Point& location = point.location;
-    SkScalar x = SkIntToScalar(location.x());
-    SkScalar y = SkIntToScalar(location.y());
-    SkPoint last;
-    if (!paths_[trace_index].getLastPt(&last) || x != last.x() ||
-        y != last.y()) {
-      paths_[trace_index].addCircle(x, y, SkIntToScalar(kPointRadius));
-      SchedulePaint();
-    }
-  }
-
-  // Overridden from views::View.
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
-    for (int i = 0; i < kMaxPaths; ++i) {
-      if (paths_[i].countPoints() == 0)
-        continue;
-      paint_.setColor(colors_[i]);
-      canvas->DrawPath(paths_[i], paint_);
-    }
-  }
-
-  SkPaint paint_;
-
-  const TouchLog& touch_log_;
-  SkPath paths_[kMaxPaths];
-  SkColor colors_[kMaxPaths];
-
-  int scale_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchHudCanvas);
-};
-
-// TouchPointView draws a single touch point in |PROJECTION| mode. This object
-// manages its own lifetime and deletes itself upon fade-out completion or
-// whenever |Remove()| is explicitly called.
-class TouchPointView : public views::View,
-                       public ui::AnimationDelegate,
-                       public views::WidgetObserver {
- public:
-  explicit TouchPointView(views::Widget* parent_widget)
-      : circle_center_(kPointRadius + 1, kPointRadius + 1),
-        gradient_center_(SkPoint::Make(kPointRadius + 1,
-                                       kPointRadius + 1)) {
-    SetPaintToLayer(true);
-    SetFillsBoundsOpaquely(false);
-
-    SetSize(gfx::Size(2 * kPointRadius + 2, 2 * kPointRadius + 2));
-
-    stroke_paint_.setStyle(SkPaint::kStroke_Style);
-    stroke_paint_.setColor(kProjectionStrokeColor);
-
-    gradient_colors_[0] = kProjectionFillColor;
-    gradient_colors_[1] = kProjectionStrokeColor;
-
-    gradient_pos_[0] = SkFloatToScalar(0.9f);
-    gradient_pos_[1] = SkFloatToScalar(1.0f);
-
-    parent_widget->GetContentsView()->AddChildView(this);
-
-    parent_widget->AddObserver(this);
-  }
-
-  void UpdateTouch(const ui::TouchEvent& touch) {
-    if (touch.type() == ui::ET_TOUCH_RELEASED ||
-        touch.type() == ui::ET_TOUCH_CANCELLED) {
-      fadeout_.reset(new ui::LinearAnimation(kFadeoutDurationInMs,
-                                             kFadeoutFrameRate,
-                                             this));
-      fadeout_->Start();
-    } else {
-      SetX(touch.root_location().x() - kPointRadius - 1);
-      SetY(touch.root_location().y() - kPointRadius - 1);
-    }
-  }
-
-  void Remove() {
-    delete this;
-  }
-
- private:
-  virtual ~TouchPointView() {
-    GetWidget()->RemoveObserver(this);
-    parent()->RemoveChildView(this);
-  }
-
-  // Overridden from views::View.
-  virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
-    int alpha = kProjectionAlpha;
-    if (fadeout_)
-      alpha = static_cast<int>(fadeout_->CurrentValueBetween(alpha, 0));
-    fill_paint_.setAlpha(alpha);
-    stroke_paint_.setAlpha(alpha);
-    SkShader* shader = SkGradientShader::CreateRadial(
-        gradient_center_,
-        SkIntToScalar(kPointRadius),
-        gradient_colors_,
-        gradient_pos_,
-        arraysize(gradient_colors_),
-        SkShader::kMirror_TileMode,
-        NULL);
-    fill_paint_.setShader(shader);
-    shader->unref();
-    canvas->DrawCircle(circle_center_, SkIntToScalar(kPointRadius),
-                       fill_paint_);
-    canvas->DrawCircle(circle_center_, SkIntToScalar(kPointRadius),
-                       stroke_paint_);
-  }
-
-  // Overridden from ui::AnimationDelegate.
-  virtual void AnimationEnded(const ui::Animation* animation) OVERRIDE {
-    DCHECK_EQ(fadeout_.get(), animation);
-    delete this;
-  }
-
-  virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE {
-    DCHECK_EQ(fadeout_.get(), animation);
-    SchedulePaint();
-  }
-
-  virtual void AnimationCanceled(const ui::Animation* animation) OVERRIDE {
-    AnimationEnded(animation);
-  }
-
-  // Overridden from views::WidgetObserver.
-  virtual void OnWidgetDestroying(views::Widget* widget) OVERRIDE {
-    fadeout_->Stop();
-  }
-
-  const gfx::Point circle_center_;
-  const SkPoint gradient_center_;
-
-  SkPaint fill_paint_;
-  SkPaint stroke_paint_;
-  SkColor gradient_colors_[2];
-  SkScalar gradient_pos_[2];
-
-  scoped_ptr<ui::Animation> fadeout_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchPointView);
-};
-
 TouchObserverHUD::TouchObserverHUD(aura::RootWindow* initial_root)
     : display_id_(initial_root->GetProperty(kDisplayIdKey)),
       root_window_(initial_root),
-      mode_(FULLSCREEN),
-      touch_log_(new TouchLog()) {
+      widget_(NULL) {
   const gfx::Display& display =
       Shell::GetInstance()->display_manager()->GetDisplayForId(display_id_);
 
   views::View* content = new views::View;
 
-  canvas_ = new TouchHudCanvas(*touch_log_);
-  content->AddChildView(canvas_);
-
   const gfx::Size& display_size = display.size();
-  canvas_->SetSize(display_size);
   content->SetSize(display_size);
 
-  label_container_ = new views::View;
-  label_container_->SetLayoutManager(new views::BoxLayout(
-      views::BoxLayout::kVertical, 0, 0, 0));
-
-  for (int i = 0; i < kMaxTouchPoints; ++i) {
-    touch_labels_[i] = new views::Label;
-    touch_labels_[i]->SetBackgroundColor(SkColorSetARGB(0, 255, 255, 255));
-    touch_labels_[i]->SetShadowColors(SK_ColorWHITE,
-                                      SK_ColorWHITE);
-    touch_labels_[i]->SetShadowOffset(1, 1);
-    label_container_->AddChildView(touch_labels_[i]);
-  }
-  label_container_->SetX(0);
-  label_container_->SetY(display_size.height() / kReducedScale);
-  label_container_->SetSize(label_container_->GetPreferredSize());
-  label_container_->SetVisible(false);
-  content->AddChildView(label_container_);
-
   widget_ = new views::Widget();
   views::Widget::InitParams
       params(views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
   params.can_activate = false;
   params.accept_events = false;
-  params.bounds = gfx::Rect(display_size);
+  params.bounds = display.bounds();
   params.parent = Shell::GetContainer(
       root_window_,
       internal::kShellWindowId_OverlayContainer);
@@ -525,142 +69,19 @@ TouchObserverHUD::~TouchObserverHUD() {
   widget_->RemoveObserver(this);
 }
 
-// static
-scoped_ptr<DictionaryValue> TouchObserverHUD::GetAllAsDictionary() {
-  scoped_ptr<DictionaryValue> value(new DictionaryValue());
-  Shell::RootWindowList roots = Shell::GetInstance()->GetAllRootWindows();
-  for (Shell::RootWindowList::iterator iter = roots.begin();
-      iter != roots.end(); ++iter) {
-    internal::RootWindowController* controller = GetRootWindowController(*iter);
-    if (controller->touch_observer_hud()) {
-      int64 display_id = (*iter)->GetProperty(kDisplayIdKey);
-      scoped_ptr<ListValue> list =
-          controller->touch_observer_hud()->GetLogAsList();
-      if (!list->empty())
-        value->Set(base::Int64ToString(display_id), list.release());
-    }
-  }
-  return value.Pass();
-}
-
-void TouchObserverHUD::ChangeToNextMode() {
-  switch (mode_) {
-    case FULLSCREEN:
-      SetMode(REDUCED_SCALE);
-      break;
-    case REDUCED_SCALE:
-      SetMode(PROJECTION);
-      break;
-    case PROJECTION:
-      SetMode(INVISIBLE);
-      break;
-    case INVISIBLE:
-      SetMode(FULLSCREEN);
-      break;
-  }
-}
-
 void TouchObserverHUD::Clear() {
-  if (widget_->IsVisible())
-    canvas_->Clear();
-  for (int i = 0; i < kMaxTouchPoints; ++i)
-    touch_labels_[i]->SetText(string16());
-  label_container_->SetSize(label_container_->GetPreferredSize());
 }
 
-scoped_ptr<ListValue> TouchObserverHUD::GetLogAsList() const {
-  return touch_log_->GetAsList();
-}
+void TouchObserverHUD::Remove() {
+  root_window_->RemovePreTargetHandler(this);
 
-void TouchObserverHUD::SetMode(Mode mode) {
-  if (mode_ == mode)
-    return;
-  // When going out of projection mode, hide all active touch points.
-  if (mode_ == PROJECTION) {
-    for (std::map<int, TouchPointView*>::iterator iter = points_.begin();
-        iter != points_.end(); ++iter)
-      iter->second->Remove();
-    points_.clear();
-  }
-  mode_ = mode;
-  switch (mode) {
-    case FULLSCREEN:
-      label_container_->SetVisible(false);
-      canvas_->SetVisible(true);
-      canvas_->SetScale(1);
-      canvas_->SchedulePaint();
-      widget_->Show();
-      break;
-    case REDUCED_SCALE:
-      label_container_->SetVisible(true);
-      canvas_->SetVisible(true);
-      canvas_->SetScale(kReducedScale);
-      canvas_->SchedulePaint();
-      widget_->Show();
-      break;
-    case PROJECTION:
-      label_container_->SetVisible(false);
-      canvas_->SetVisible(false);
-      widget_->Show();
-      break;
-    case INVISIBLE:
-      widget_->Hide();
-      break;
-  }
-}
+  RootWindowController* controller = GetRootWindowController(root_window_);
+  UnsetHudForRootWindowController(controller);
 
-void TouchObserverHUD::UpdateTouchPointLabel(int index) {
-  int trace_index = touch_log_->GetTraceIndex(index);
-  const TouchTrace& trace = touch_log_->traces()[trace_index];
-  TouchTrace::const_reverse_iterator point = trace.log().rbegin();
-  ui::EventType touch_status = point->type;
-  float touch_radius = std::max(point->radius_x, point->radius_y);
-  while (point != trace.log().rend() && point->type == ui::ET_TOUCH_CANCELLED)
-    point++;
-  DCHECK(point != trace.log().rend());
-  gfx::Point touch_position = point->location;
-
-  std::string string = base::StringPrintf("%2d: %s %s (%.4f)",
-                                          index,
-                                          GetTouchEventLabel(touch_status),
-                                          touch_position.ToString().c_str(),
-                                          touch_radius);
-  touch_labels_[index]->SetText(UTF8ToUTF16(string));
+  widget_->CloseNow();
 }
 
-void TouchObserverHUD::OnTouchEvent(ui::TouchEvent* event) {
-  if (event->touch_id() >= kMaxTouchPoints)
-    return;
-
-  touch_log_->AddTouchPoint(*event);
-  canvas_->TouchPointAdded(event->touch_id());
-
-  if (mode_ == PROJECTION) {
-    if (event->type() == ui::ET_TOUCH_PRESSED) {
-      TouchPointView* point = new TouchPointView(widget_);
-      point->UpdateTouch(*event);
-      std::pair<std::map<int, TouchPointView*>::iterator, bool> result =
-          points_.insert(std::make_pair(event->touch_id(), point));
-      // If a |TouchPointView| is already mapped to the touch id, remove it and
-      // replace it with the new one.
-      if (!result.second) {
-        result.first->second->Remove();
-        result.first->second = point;
-      }
-    } else {
-      std::map<int, TouchPointView*>::iterator iter =
-          points_.find(event->touch_id());
-      if (iter != points_.end()) {
-        iter->second->UpdateTouch(*event);
-        if (event->type() == ui::ET_TOUCH_RELEASED ||
-            event->type() == ui::ET_TOUCH_CANCELLED)
-          points_.erase(iter);
-      }
-    }
-  }
-
-  UpdateTouchPointLabel(event->touch_id());
-  label_container_->SetSize(label_container_->GetPreferredSize());
+void TouchObserverHUD::OnTouchEvent(ui::TouchEvent* /*event*/) {
 }
 
 void TouchObserverHUD::OnWidgetDestroying(views::Widget* widget) {
@@ -671,10 +92,7 @@ void TouchObserverHUD::OnWidgetDestroying(views::Widget* widget) {
 void TouchObserverHUD::OnDisplayBoundsChanged(const gfx::Display& display) {
   if (display.id() != display_id_)
     return;
-  const gfx::Size& size = display.size();
-  widget_->SetSize(size);
-  canvas_->SetSize(size);
-  label_container_->SetY(size.height() / kReducedScale);
+  widget_->SetSize(display.size());
 }
 
 void TouchObserverHUD::OnDisplayAdded(const gfx::Display& new_display) {}
@@ -700,7 +118,7 @@ void TouchObserverHUD::OnDisplayConfigurationChanging() {
   root_window_->RemovePreTargetHandler(this);
 
   RootWindowController* controller = GetRootWindowController(root_window_);
-  controller->set_touch_observer_hud(NULL);
+  UnsetHudForRootWindowController(controller);
 
   views::Widget::ReparentNativeView(
       widget_->GetNativeView(),
@@ -723,7 +141,7 @@ void TouchObserverHUD::OnDisplayConfigurationChanged() {
                           internal::kShellWindowId_OverlayContainer));
 
   RootWindowController* controller = GetRootWindowController(root_window_);
-  controller->set_touch_observer_hud(this);
+  SetHudForRootWindowController(controller);
 
   root_window_->AddPreTargetHandler(this);
 }