ui/aura/window.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ui/aura/window.h"
   6
   7 #include <algorithm>
   8
   9 #include "base/bind.h"
  10 #include "base/bind_helpers.h"
  11 #include "base/callback.h"
  12 #include "base/logging.h"
  13 #include "base/profiler/scoped_tracker.h"
  14 #include "base/strings/string_number_conversions.h"
  15 #include "base/strings/string_util.h"
  16 #include "base/strings/stringprintf.h"
  17 #include "ui/aura/client/capture_client.h"
  18 #include "ui/aura/client/cursor_client.h"
  19 #include "ui/aura/client/event_client.h"
  20 #include "ui/aura/client/focus_client.h"
  21 #include "ui/aura/client/screen_position_client.h"
  22 #include "ui/aura/client/visibility_client.h"
  23 #include "ui/aura/client/window_stacking_client.h"
  24 #include "ui/aura/env.h"
  25 #include "ui/aura/layout_manager.h"
  26 #include "ui/aura/window_delegate.h"
  27 #include "ui/aura/window_event_dispatcher.h"
  28 #include "ui/aura/window_observer.h"
  29 #include "ui/aura/window_tracker.h"
  30 #include "ui/aura/window_tree_host.h"
  31 #include "ui/compositor/compositor.h"
  32 #include "ui/compositor/layer.h"
  33 #include "ui/events/event_target_iterator.h"
  34 #include "ui/gfx/canvas.h"
  35 #include "ui/gfx/path.h"
  36 #include "ui/gfx/scoped_canvas.h"
  37 #include "ui/gfx/screen.h"
  38
  39 namespace aura {
  40
  41 namespace {
  42
  43 // Used when searching for a Window to stack relative to.
  44 template <class T>
  45 T IteratorForDirectionBegin(aura::Window* window);
  46
  47 template <>
  48 Window::Windows::const_iterator IteratorForDirectionBegin(
  49     aura::Window* window) {
  50   return window->children().begin();
  51 }
  52
  53 template <>
  54 Window::Windows::const_reverse_iterator IteratorForDirectionBegin(
  55     aura::Window* window) {
  56   return window->children().rbegin();
  57 }
  58
  59 template <class T>
  60 T IteratorForDirectionEnd(aura::Window* window);
  61
  62 template <>
  63 Window::Windows::const_iterator IteratorForDirectionEnd(aura::Window* window) {
  64   return window->children().end();
  65 }
  66
  67 template <>
  68 Window::Windows::const_reverse_iterator IteratorForDirectionEnd(
  69     aura::Window* window) {
  70   return window->children().rend();
  71 }
  72
  73 // Depth first search for the first Window with a layer to stack relative
  74 // to. Starts at target. Does not descend into |ignore|.
  75 template <class T>
  76 ui::Layer* FindStackingTargetLayerDown(aura::Window* target,
  77                                        aura::Window* ignore) {
  78   if (target == ignore)
  79     return NULL;
  80
  81   if (target->layer())
  82     return target->layer();
  83
  84   for (T i = IteratorForDirectionBegin<T>(target);
  85        i != IteratorForDirectionEnd<T>(target); ++i) {
  86     ui::Layer* layer = FindStackingTargetLayerDown<T>(*i, ignore);
  87     if (layer)
  88       return layer;
  89   }
  90   return NULL;
  91 }
  92
  93 // Depth first search through the siblings of |target||. This does not search
  94 // all the siblings, only those before/after |target| (depening upon the
  95 // template type) and ignoring |ignore|. Returns the Layer of the first Window
  96 // encountered with a Layer.
  97 template <class T>
  98 ui::Layer* FindStackingLayerInSiblings(aura::Window* target,
  99                                        aura::Window* ignore) {
 100   aura::Window* parent = target->parent();
 101   for (T i = std::find(IteratorForDirectionBegin<T>(parent),
 102                   IteratorForDirectionEnd<T>(parent), target);
 103        i != IteratorForDirectionEnd<T>(parent); ++i) {
 104     ui::Layer* layer = FindStackingTargetLayerDown<T>(*i, ignore);
 105     if (layer)
 106       return layer;
 107   }
 108   return NULL;
 109 }
 110
 111 // Returns the first Window that has a Layer. This does a depth first search
 112 // through the descendants of |target| first, then ascends up doing a depth
 113 // first search through siblings of all ancestors until a Layer is found or an
 114 // ancestor with a layer is found. This is intended to locate a layer to stack
 115 // other layers relative to.
 116 template <class T>
 117 ui::Layer* FindStackingTargetLayer(aura::Window* target, aura::Window* ignore) {
 118   ui::Layer* result = FindStackingTargetLayerDown<T>(target, ignore);
 119   if (result)
 120     return result;
 121   while (target->parent()) {
 122     ui::Layer* result = FindStackingLayerInSiblings<T>(target, ignore);
 123     if (result)
 124       return result;
 125     target = target->parent();
 126     if (target->layer())
 127       return NULL;
 128   }
 129   return NULL;
 130 }
 131
 132 // Does a depth first search for all descendants of |child| that have layers.
 133 // This stops at any descendants that have layers (and adds them to |layers|).
 134 void GetLayersToStack(aura::Window* child, std::vector<ui::Layer*>* layers) {
 135   if (child->layer()) {
 136     layers->push_back(child->layer());
 137     return;
 138   }
 139   for (size_t i = 0; i < child->children().size(); ++i)
 140     GetLayersToStack(child->children()[i], layers);
 141 }
 142
 143 }  // namespace
 144
 145 class ScopedCursorHider {
 146  public:
 147   explicit ScopedCursorHider(Window* window)
 148       : window_(window),
 149         hid_cursor_(false) {
 150     if (!window_->IsRootWindow())
 151       return;
 152     const bool cursor_is_in_bounds = window_->GetBoundsInScreen().Contains(
 153         Env::GetInstance()->last_mouse_location());
 154     client::CursorClient* cursor_client = client::GetCursorClient(window_);
 155     if (cursor_is_in_bounds && cursor_client &&
 156         cursor_client->IsCursorVisible()) {
 157       cursor_client->HideCursor();
 158       hid_cursor_ = true;
 159     }
 160   }
 161   ~ScopedCursorHider() {
 162     if (!window_->IsRootWindow())
 163       return;
 164
 165     // Update the device scale factor of the cursor client only when the last
 166     // mouse location is on this root window.
 167     if (hid_cursor_) {
 168       client::CursorClient* cursor_client = client::GetCursorClient(window_);
 169       if (cursor_client) {
 170         const gfx::Display& display =
 171             gfx::Screen::GetScreenFor(window_)->GetDisplayNearestWindow(
 172                 window_);
 173         cursor_client->SetDisplay(display);
 174         cursor_client->ShowCursor();
 175       }
 176     }
 177   }
 178
 179  private:
 180   Window* window_;
 181   bool hid_cursor_;
 182
 183   DISALLOW_COPY_AND_ASSIGN(ScopedCursorHider);
 184 };
 185
 186 Window::Window(WindowDelegate* delegate)
 187     : host_(NULL),
 188       type_(ui::wm::WINDOW_TYPE_UNKNOWN),
 189       owned_by_parent_(true),
 190       delegate_(delegate),
 191       parent_(NULL),
 192       visible_(false),
 193       id_(-1),
 194       transparent_(false),
 195       user_data_(NULL),
 196       ignore_events_(false),
 197       // Don't notify newly added observers during notification. This causes
 198       // problems for code that adds an observer as part of an observer
 199       // notification (such as the workspace code).
 200       observers_(base::ObserverList<WindowObserver>::NOTIFY_EXISTING_ONLY) {
 201   set_target_handler(delegate_);
 202 }
 203
 204 Window::~Window() {
 205   if (layer()->owner() == this)
 206     layer()->CompleteAllAnimations();
 207   layer()->SuppressPaint();
 208
 209   // Let the delegate know we're in the processing of destroying.
 210   if (delegate_)
 211     delegate_->OnWindowDestroying(this);
 212   FOR_EACH_OBSERVER(WindowObserver, observers_, OnWindowDestroying(this));
 213
 214   // While we are being destroyed, our target handler may also be in the
 215   // process of destruction or already destroyed, so do not forward any
 216   // input events at the ui::EP_TARGET phase.
 217   set_target_handler(nullptr);
 218
 219   // TODO(beng): See comment in window_event_dispatcher.h. This shouldn't be
 220   //             necessary but unfortunately is right now due to ordering
 221   //             peculiarities. WED must be notified _after_ other observers
 222   //             are notified of pending teardown but before the hierarchy
 223   //             is actually torn down.
 224   WindowTreeHost* host = GetHost();
 225   if (host)
 226     host->dispatcher()->OnPostNotifiedWindowDestroying(this);
 227
 228   // The window should have already had its state cleaned up in
 229   // WindowEventDispatcher::OnWindowHidden(), but there have been some crashes
 230   // involving windows being destroyed without being hidden first. See
 231   // crbug.com/342040. This should help us debug the issue. TODO(tdresser):
 232   // remove this once we determine why we have windows that are destroyed
 233   // without being hidden.
 234   bool window_incorrectly_cleaned_up = CleanupGestureState();
 235   CHECK(!window_incorrectly_cleaned_up);
 236
 237   // Then destroy the children.
 238   RemoveOrDestroyChildren();
 239
 240   // The window needs to be removed from the parent before calling the
 241   // WindowDestroyed callbacks of delegate and the observers.
 242   if (parent_)
 243     parent_->RemoveChild(this);
 244
 245   if (delegate_)
 246     delegate_->OnWindowDestroyed(this);
 247   base::ObserverListBase<WindowObserver>::Iterator iter(&observers_);
 248   for (WindowObserver* observer = iter.GetNext(); observer;
 249        observer = iter.GetNext()) {
 250     RemoveObserver(observer);
 251     observer->OnWindowDestroyed(this);
 252   }
 253
 254   // Clear properties.
 255   for (std::map<const void*, Value>::const_iterator iter = prop_map_.begin();
 256        iter != prop_map_.end();
 257        ++iter) {
 258     if (iter->second.deallocator)
 259       (*iter->second.deallocator)(iter->second.value);
 260   }
 261   prop_map_.clear();
 262
 263   // The layer will either be destroyed by |layer_owner_|'s dtor, or by whoever
 264   // acquired it.
 265   layer()->set_delegate(NULL);
 266   DestroyLayer();
 267 }
 268
 269 void Window::Init(ui::LayerType layer_type) {
 270   SetLayer(new ui::Layer(layer_type));
 271   layer()->SetVisible(false);
 272   layer()->set_delegate(this);
 273   UpdateLayerName();
 274   layer()->SetFillsBoundsOpaquely(!transparent_);
 275   Env::GetInstance()->NotifyWindowInitialized(this);
 276 }
 277
 278 void Window::SetType(ui::wm::WindowType type) {
 279   // Cannot change type after the window is initialized.
 280   DCHECK(!layer());
 281   type_ = type;
 282 }
 283
 284 void Window::SetName(const std::string& name) {
 285   name_ = name;
 286   if (layer())
 287     UpdateLayerName();
 288 }
 289
 290 void Window::SetTitle(const base::string16& title) {
 291   title_ = title;
 292   FOR_EACH_OBSERVER(WindowObserver,
 293                     observers_,
 294                     OnWindowTitleChanged(this));
 295 }
 296
 297 void Window::SetTransparent(bool transparent) {
 298   transparent_ = transparent;
 299   if (layer())
 300     layer()->SetFillsBoundsOpaquely(!transparent_);
 301 }
 302
 303 void Window::SetFillsBoundsCompletely(bool fills_bounds) {
 304   layer()->SetFillsBoundsCompletely(fills_bounds);
 305 }
 306
 307 Window* Window::GetRootWindow() {
 308   return const_cast<Window*>(
 309       static_cast<const Window*>(this)->GetRootWindow());
 310 }
 311
 312 const Window* Window::GetRootWindow() const {
 313   return IsRootWindow() ? this : parent_ ? parent_->GetRootWindow() : NULL;
 314 }
 315
 316 WindowTreeHost* Window::GetHost() {
 317   return const_cast<WindowTreeHost*>(const_cast<const Window*>(this)->
 318       GetHost());
 319 }
 320
 321 const WindowTreeHost* Window::GetHost() const {
 322   const Window* root_window = GetRootWindow();
 323   return root_window ? root_window->host_ : NULL;
 324 }
 325
 326 void Window::Show() {
 327   DCHECK_EQ(visible_, layer()->GetTargetVisibility());
 328   // It is not allowed that a window is visible but the layers alpha is fully
 329   // transparent since the window would still be considered to be active but
 330   // could not be seen.
 331   DCHECK_IMPLIES(visible_, layer()->GetTargetOpacity() > 0.0f);
 332   SetVisible(true);
 333 }
 334
 335 void Window::Hide() {
 336   // RootWindow::OnVisibilityChanged will call ReleaseCapture.
 337   SetVisible(false);
 338 }
 339
 340 bool Window::IsVisible() const {
 341   // Layer visibility can be inconsistent with window visibility, for example
 342   // when a Window is hidden, we want this function to return false immediately
 343   // after, even though the client may decide to animate the hide effect (and
 344   // so the layer will be visible for some time after Hide() is called).
 345   for (const Window* window = this; window; window = window->parent()) {
 346     if (!window->visible_)
 347       return false;
 348     if (window->layer())
 349       return window->layer()->IsDrawn();
 350   }
 351   return false;
 352 }
 353
 354 gfx::Rect Window::GetBoundsInRootWindow() const {
 355   // TODO(beng): There may be a better way to handle this, and the existing code
 356   //             is likely wrong anyway in a multi-display world, but this will
 357   //             do for now.
 358   if (!GetRootWindow())
 359     return bounds();
 360   gfx::Rect bounds_in_root(bounds().size());
 361   ConvertRectToTarget(this, GetRootWindow(), &bounds_in_root);
 362   return bounds_in_root;
 363 }
 364
 365 gfx::Rect Window::GetBoundsInScreen() const {
 366   gfx::Rect bounds(GetBoundsInRootWindow());
 367   const Window* root = GetRootWindow();
 368   if (root) {
 369     aura::client::ScreenPositionClient* screen_position_client =
 370         aura::client::GetScreenPositionClient(root);
 371     if (screen_position_client) {
 372       gfx::Point origin = bounds.origin();
 373       screen_position_client->ConvertPointToScreen(root, &origin);
 374       bounds.set_origin(origin);
 375     }
 376   }
 377   return bounds;
 378 }
 379
 380 void Window::SetTransform(const gfx::Transform& transform) {
 381   if (!layer()) {
 382     // Transforms aren't supported on layerless windows.
 383     NOTREACHED();
 384     return;
 385   }
 386   FOR_EACH_OBSERVER(WindowObserver, observers_,
 387                     OnWindowTransforming(this));
 388   layer()->SetTransform(transform);
 389   FOR_EACH_OBSERVER(WindowObserver, observers_,
 390                     OnWindowTransformed(this));
 391   NotifyAncestorWindowTransformed(this);
 392 }
 393
 394 void Window::SetLayoutManager(LayoutManager* layout_manager) {
 395   if (layout_manager == layout_manager_)
 396     return;
 397   layout_manager_.reset(layout_manager);
 398   if (!layout_manager)
 399     return;
 400   // If we're changing to a new layout manager, ensure it is aware of all the
 401   // existing child windows.
 402   for (Windows::const_iterator it = children_.begin();
 403        it != children_.end();
 404        ++it)
 405     layout_manager_->OnWindowAddedToLayout(*it);
 406 }
 407
 408 scoped_ptr<ui::EventTargeter>
 409 Window::SetEventTargeter(scoped_ptr<ui::EventTargeter> targeter) {
 410   scoped_ptr<ui::EventTargeter> old_targeter = targeter_.Pass();
 411   targeter_ = targeter.Pass();
 412   return old_targeter.Pass();
 413 }
 414
 415 void Window::SetBounds(const gfx::Rect& new_bounds) {
 416   if (parent_ && parent_->layout_manager())
 417     parent_->layout_manager()->SetChildBounds(this, new_bounds);
 418   else {
 419     // Ensure we don't go smaller than our minimum bounds.
 420     gfx::Rect final_bounds(new_bounds);
 421     if (delegate_) {
 422       const gfx::Size& min_size = delegate_->GetMinimumSize();
 423       final_bounds.set_width(std::max(min_size.width(), final_bounds.width()));
 424       final_bounds.set_height(std::max(min_size.height(),
 425                                        final_bounds.height()));
 426     }
 427     SetBoundsInternal(final_bounds);
 428   }
 429 }
 430
 431 void Window::SetBoundsInScreen(const gfx::Rect& new_bounds_in_screen,
 432                                const gfx::Display& dst_display) {
 433   Window* root = GetRootWindow();
 434   if (root) {
 435     aura::client::ScreenPositionClient* screen_position_client =
 436         aura::client::GetScreenPositionClient(root);
 437     screen_position_client->SetBounds(this, new_bounds_in_screen, dst_display);
 438     return;
 439   }
 440   SetBounds(new_bounds_in_screen);
 441 }
 442
 443 gfx::Rect Window::GetTargetBounds() const {
 444   return layer() ? layer()->GetTargetBounds() : bounds();
 445 }
 446
 447 void Window::SchedulePaintInRect(const gfx::Rect& rect) {
 448   layer()->SchedulePaint(rect);
 449 }
 450
 451 void Window::StackChildAtTop(Window* child) {
 452   if (children_.size() <= 1 || child == children_.back())
 453     return;  // In the front already.
 454   StackChildAbove(child, children_.back());
 455 }
 456
 457 void Window::StackChildAbove(Window* child, Window* target) {
 458   StackChildRelativeTo(child, target, STACK_ABOVE);
 459 }
 460
 461 void Window::StackChildAtBottom(Window* child) {
 462   if (children_.size() <= 1 || child == children_.front())
 463     return;  // At the bottom already.
 464   StackChildBelow(child, children_.front());
 465 }
 466
 467 void Window::StackChildBelow(Window* child, Window* target) {
 468   StackChildRelativeTo(child, target, STACK_BELOW);
 469 }
 470
 471 void Window::AddChild(Window* child) {
 472   DCHECK(layer()) << "Parent has not been Init()ed yet.";
 473   DCHECK(child->layer()) << "Child has not been Init()ed yt.";
 474   WindowObserver::HierarchyChangeParams params;
 475   params.target = child;
 476   params.new_parent = this;
 477   params.old_parent = child->parent();
 478   params.phase = WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGING;
 479   NotifyWindowHierarchyChange(params);
 480
 481   Window* old_root = child->GetRootWindow();
 482
 483   DCHECK(std::find(children_.begin(), children_.end(), child) ==
 484       children_.end());
 485   if (child->parent())
 486     child->parent()->RemoveChildImpl(child, this);
 487
 488   child->parent_ = this;
 489   layer()->Add(child->layer());
 490
 491   children_.push_back(child);
 492   if (layout_manager_)
 493     layout_manager_->OnWindowAddedToLayout(child);
 494   FOR_EACH_OBSERVER(WindowObserver, observers_, OnWindowAdded(child));
 495   child->OnParentChanged();
 496
 497   Window* root_window = GetRootWindow();
 498   if (root_window && old_root != root_window) {
 499     root_window->GetHost()->dispatcher()->OnWindowAddedToRootWindow(child);
 500     child->NotifyAddedToRootWindow();
 501   }
 502
 503   params.phase = WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGED;
 504   NotifyWindowHierarchyChange(params);
 505 }
 506
 507 void Window::RemoveChild(Window* child) {
 508   WindowObserver::HierarchyChangeParams params;
 509   params.target = child;
 510   params.new_parent = NULL;
 511   params.old_parent = this;
 512   params.phase = WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGING;
 513   NotifyWindowHierarchyChange(params);
 514
 515   RemoveChildImpl(child, NULL);
 516
 517   params.phase = WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGED;
 518   NotifyWindowHierarchyChange(params);
 519 }
 520
 521 bool Window::Contains(const Window* other) const {
 522   for (const Window* parent = other; parent; parent = parent->parent_) {
 523     if (parent == this)
 524       return true;
 525   }
 526   return false;
 527 }
 528
 529 Window* Window::GetChildById(int id) {
 530   return const_cast<Window*>(const_cast<const Window*>(this)->GetChildById(id));
 531 }
 532
 533 const Window* Window::GetChildById(int id) const {
 534   Windows::const_iterator i;
 535   for (i = children_.begin(); i != children_.end(); ++i) {
 536     if ((*i)->id() == id)
 537       return *i;
 538     const Window* result = (*i)->GetChildById(id);
 539     if (result)
 540       return result;
 541   }
 542   return NULL;
 543 }
 544
 545 // static
 546 void Window::ConvertPointToTarget(const Window* source,
 547                                   const Window* target,
 548                                   gfx::Point* point) {
 549   if (!source)
 550     return;
 551   if (source->GetRootWindow() != target->GetRootWindow()) {
 552     client::ScreenPositionClient* source_client =
 553         client::GetScreenPositionClient(source->GetRootWindow());
 554     // |source_client| can be NULL in tests.
 555     if (source_client)
 556       source_client->ConvertPointToScreen(source, point);
 557
 558     client::ScreenPositionClient* target_client =
 559         client::GetScreenPositionClient(target->GetRootWindow());
 560     // |target_client| can be NULL in tests.
 561     if (target_client)
 562       target_client->ConvertPointFromScreen(target, point);
 563   } else {
 564     ui::Layer::ConvertPointToLayer(source->layer(), target->layer(), point);
 565   }
 566 }
 567
 568 // static
 569 void Window::ConvertRectToTarget(const Window* source,
 570                                  const Window* target,
 571                                  gfx::Rect* rect) {
 572   DCHECK(rect);
 573   gfx::Point origin = rect->origin();
 574   ConvertPointToTarget(source, target, &origin);
 575   rect->set_origin(origin);
 576 }
 577
 578 void Window::MoveCursorTo(const gfx::Point& point_in_window) {
 579   Window* root_window = GetRootWindow();
 580   DCHECK(root_window);
 581   gfx::Point point_in_root(point_in_window);
 582   ConvertPointToTarget(this, root_window, &point_in_root);
 583   root_window->GetHost()->MoveCursorTo(point_in_root);
 584 }
 585
 586 gfx::NativeCursor Window::GetCursor(const gfx::Point& point) const {
 587   return delegate_ ? delegate_->GetCursor(point) : gfx::kNullCursor;
 588 }
 589
 590 void Window::AddObserver(WindowObserver* observer) {
 591   observer->OnObservingWindow(this);
 592   observers_.AddObserver(observer);
 593 }
 594
 595 void Window::RemoveObserver(WindowObserver* observer) {
 596   observer->OnUnobservingWindow(this);
 597   observers_.RemoveObserver(observer);
 598 }
 599
 600 bool Window::HasObserver(const WindowObserver* observer) const {
 601   return observers_.HasObserver(observer);
 602 }
 603
 604 bool Window::ContainsPointInRoot(const gfx::Point& point_in_root) const {
 605   const Window* root_window = GetRootWindow();
 606   if (!root_window)
 607     return false;
 608   gfx::Point local_point(point_in_root);
 609   ConvertPointToTarget(root_window, this, &local_point);
 610   return gfx::Rect(GetTargetBounds().size()).Contains(local_point);
 611 }
 612
 613 bool Window::ContainsPoint(const gfx::Point& local_point) const {
 614   return gfx::Rect(bounds().size()).Contains(local_point);
 615 }
 616
 617 Window* Window::GetEventHandlerForPoint(const gfx::Point& local_point) {
 618   return GetWindowForPoint(local_point, true, true);
 619 }
 620
 621 Window* Window::GetTopWindowContainingPoint(const gfx::Point& local_point) {
 622   return GetWindowForPoint(local_point, false, false);
 623 }
 624
 625 Window* Window::GetToplevelWindow() {
 626   Window* topmost_window_with_delegate = NULL;
 627   for (aura::Window* window = this; window != NULL; window = window->parent()) {
 628     if (window->delegate())
 629       topmost_window_with_delegate = window;
 630   }
 631   return topmost_window_with_delegate;
 632 }
 633
 634 void Window::Focus() {
 635   client::FocusClient* client = client::GetFocusClient(this);
 636   DCHECK(client);
 637   client->FocusWindow(this);
 638 }
 639
 640 bool Window::HasFocus() const {
 641   client::FocusClient* client = client::GetFocusClient(this);
 642   return client && client->GetFocusedWindow() == this;
 643 }
 644
 645 bool Window::CanFocus() const {
 646   if (IsRootWindow())
 647     return IsVisible();
 648
 649   // NOTE: as part of focusing the window the ActivationClient may make the
 650   // window visible (by way of making a hidden ancestor visible). For this
 651   // reason we can't check visibility here and assume the client is doing it.
 652   if (!parent_ || (delegate_ && !delegate_->CanFocus()))
 653     return false;
 654
 655   // The client may forbid certain windows from receiving focus at a given point
 656   // in time.
 657   client::EventClient* client = client::GetEventClient(GetRootWindow());
 658   if (client && !client->CanProcessEventsWithinSubtree(this))
 659     return false;
 660
 661   return parent_->CanFocus();
 662 }
 663
 664 bool Window::CanReceiveEvents() const {
 665   if (IsRootWindow())
 666     return IsVisible();
 667
 668   // The client may forbid certain windows from receiving events at a given
 669   // point in time.
 670   client::EventClient* client = client::GetEventClient(GetRootWindow());
 671   if (client && !client->CanProcessEventsWithinSubtree(this))
 672     return false;
 673
 674   return parent_ && IsVisible() && parent_->CanReceiveEvents();
 675 }
 676
 677 void Window::SetCapture() {
 678   if (!IsVisible())
 679     return;
 680
 681   Window* root_window = GetRootWindow();
 682   if (!root_window)
 683     return;
 684   client::CaptureClient* capture_client = client::GetCaptureClient(root_window);
 685   if (!capture_client)
 686     return;
 687   client::GetCaptureClient(root_window)->SetCapture(this);
 688 }
 689
 690 void Window::ReleaseCapture() {
 691   Window* root_window = GetRootWindow();
 692   if (!root_window)
 693     return;
 694   client::CaptureClient* capture_client = client::GetCaptureClient(root_window);
 695   if (!capture_client)
 696     return;
 697   client::GetCaptureClient(root_window)->ReleaseCapture(this);
 698 }
 699
 700 bool Window::HasCapture() {
 701   Window* root_window = GetRootWindow();
 702   if (!root_window)
 703     return false;
 704   client::CaptureClient* capture_client = client::GetCaptureClient(root_window);
 705   return capture_client && capture_client->GetCaptureWindow() == this;
 706 }
 707
 708 void Window::SuppressPaint() {
 709   layer()->SuppressPaint();
 710 }
 711
 712 // {Set,Get,Clear}Property are implemented in window_property.h.
 713
 714 void Window::SetNativeWindowProperty(const char* key, void* value) {
 715   SetPropertyInternal(
 716       key, key, NULL, reinterpret_cast<int64>(value), 0);
 717 }
 718
 719 void* Window::GetNativeWindowProperty(const char* key) const {
 720   return reinterpret_cast<void*>(GetPropertyInternal(key, 0));
 721 }
 722
 723 void Window::OnDeviceScaleFactorChanged(float device_scale_factor) {
 724   ScopedCursorHider hider(this);
 725   if (delegate_)
 726     delegate_->OnDeviceScaleFactorChanged(device_scale_factor);
 727 }
 728
 729 #if !defined(NDEBUG)
 730 std::string Window::GetDebugInfo() const {
 731   return base::StringPrintf(
 732       "%s<%d> bounds(%d, %d, %d, %d) %s %s opacity=%.1f",
 733       name().empty() ? "Unknown" : name().c_str(), id(),
 734       bounds().x(), bounds().y(), bounds().width(), bounds().height(),
 735       visible_ ? "WindowVisible" : "WindowHidden",
 736       layer() ?
 737           (layer()->GetTargetVisibility() ? "LayerVisible" : "LayerHidden") :
 738           "NoLayer",
 739       layer() ? layer()->opacity() : 1.0f);
 740 }
 741
 742 void Window::PrintWindowHierarchy(int depth) const {
 743   VLOG(0) << base::StringPrintf(
 744       "%*s%s", depth * 2, "", GetDebugInfo().c_str());
 745   for (Windows::const_iterator it = children_.begin();
 746        it != children_.end(); ++it) {
 747     Window* child = *it;
 748     child->PrintWindowHierarchy(depth + 1);
 749   }
 750 }
 751 #endif
 752
 753 void Window::RemoveOrDestroyChildren() {
 754   while (!children_.empty()) {
 755     Window* child = children_[0];
 756     if (child->owned_by_parent_) {
 757       delete child;
 758       // Deleting the child so remove it from out children_ list.
 759       DCHECK(std::find(children_.begin(), children_.end(), child) ==
 760              children_.end());
 761     } else {
 762       // Even if we can't delete the child, we still need to remove it from the
 763       // parent so that relevant bookkeeping (parent_ back-pointers etc) are
 764       // updated.
 765       RemoveChild(child);
 766     }
 767   }
 768 }
 769
 770 ///////////////////////////////////////////////////////////////////////////////
 771 // Window, private:
 772
 773 int64 Window::SetPropertyInternal(const void* key,
 774                                   const char* name,
 775                                   PropertyDeallocator deallocator,
 776                                   int64 value,
 777                                   int64 default_value) {
 778   int64 old = GetPropertyInternal(key, default_value);
 779   if (value == default_value) {
 780     prop_map_.erase(key);
 781   } else {
 782     Value prop_value;
 783     prop_value.name = name;
 784     prop_value.value = value;
 785     prop_value.deallocator = deallocator;
 786     prop_map_[key] = prop_value;
 787   }
 788   FOR_EACH_OBSERVER(WindowObserver, observers_,
 789                     OnWindowPropertyChanged(this, key, old));
 790   return old;
 791 }
 792
 793 int64 Window::GetPropertyInternal(const void* key,
 794                                   int64 default_value) const {
 795   std::map<const void*, Value>::const_iterator iter = prop_map_.find(key);
 796   if (iter == prop_map_.end())
 797     return default_value;
 798   return iter->second.value;
 799 }
 800
 801 bool Window::HitTest(const gfx::Point& local_point) {
 802   gfx::Rect local_bounds(bounds().size());
 803   if (!delegate_ || !delegate_->HasHitTestMask())
 804     return local_bounds.Contains(local_point);
 805
 806   gfx::Path mask;
 807   delegate_->GetHitTestMask(&mask);
 808
 809   SkRegion clip_region;
 810   clip_region.setRect(local_bounds.x(), local_bounds.y(),
 811                       local_bounds.width(), local_bounds.height());
 812   SkRegion mask_region;
 813   return mask_region.setPath(mask, clip_region) &&
 814       mask_region.contains(local_point.x(), local_point.y());
 815 }
 816
 817 void Window::SetBoundsInternal(const gfx::Rect& new_bounds) {
 818   gfx::Rect old_bounds = GetTargetBounds();
 819
 820   // Always need to set the layer's bounds -- even if it is to the same thing.
 821   // This may cause important side effects such as stopping animation.
 822   layer()->SetBounds(new_bounds);
 823
 824   // If we are currently not the layer's delegate, we will not get bounds
 825   // changed notification from the layer (this typically happens after animating
 826   // hidden). We must notify ourselves.
 827   if (layer()->delegate() != this)
 828     OnWindowBoundsChanged(old_bounds);
 829 }
 830
 831 void Window::SetVisible(bool visible) {
 832   // TODO(vadimt): Remove ScopedTracker below once crbug.com/440919 is fixed.
 833   tracked_objects::ScopedTracker tracking_profile(
 834       FROM_HERE_WITH_EXPLICIT_FUNCTION("440919 Window::SetVisible"));
 835
 836   if ((layer() && visible == layer()->GetTargetVisibility()) ||
 837       (!layer() && visible == visible_))
 838     return;  // No change.
 839
 840   FOR_EACH_OBSERVER(WindowObserver, observers_,
 841                     OnWindowVisibilityChanging(this, visible));
 842
 843   client::VisibilityClient* visibility_client =
 844       client::GetVisibilityClient(this);
 845   if (visibility_client)
 846     visibility_client->UpdateLayerVisibility(this, visible);
 847   else
 848     layer()->SetVisible(visible);
 849   visible_ = visible;
 850   SchedulePaint();
 851   if (parent_ && parent_->layout_manager_)
 852     parent_->layout_manager_->OnChildWindowVisibilityChanged(this, visible);
 853
 854   if (delegate_)
 855     delegate_->OnWindowTargetVisibilityChanged(visible);
 856
 857   NotifyWindowVisibilityChanged(this, visible);
 858 }
 859
 860 void Window::SchedulePaint() {
 861   SchedulePaintInRect(gfx::Rect(0, 0, bounds().width(), bounds().height()));
 862 }
 863
 864 void Window::Paint(const ui::PaintContext& context) {
 865   if (delegate_)
 866     delegate_->OnPaint(context);
 867 }
 868
 869 Window* Window::GetWindowForPoint(const gfx::Point& local_point,
 870                                   bool return_tightest,
 871                                   bool for_event_handling) {
 872   if (!IsVisible())
 873     return NULL;
 874
 875   if ((for_event_handling && !HitTest(local_point)) ||
 876       (!for_event_handling && !ContainsPoint(local_point)))
 877     return NULL;
 878
 879   // Check if I should claim this event and not pass it to my children because
 880   // the location is inside my hit test override area.  For details, see
 881   // set_hit_test_bounds_override_inner().
 882   if (for_event_handling && !hit_test_bounds_override_inner_.empty()) {
 883     gfx::Rect inset_local_bounds(gfx::Point(), bounds().size());
 884     inset_local_bounds.Inset(hit_test_bounds_override_inner_);
 885     // We know we're inside the normal local bounds, so if we're outside the
 886     // inset bounds we must be in the special hit test override area.
 887     DCHECK(HitTest(local_point));
 888     if (!inset_local_bounds.Contains(local_point))
 889       return delegate_ ? this : NULL;
 890   }
 891
 892   if (!return_tightest && delegate_)
 893     return this;
 894
 895   for (Windows::const_reverse_iterator it = children_.rbegin(),
 896            rend = children_.rend();
 897        it != rend; ++it) {
 898     Window* child = *it;
 899
 900     if (for_event_handling) {
 901       if (child->ignore_events_)
 902         continue;
 903       // The client may not allow events to be processed by certain subtrees.
 904       client::EventClient* client = client::GetEventClient(GetRootWindow());
 905       if (client && !client->CanProcessEventsWithinSubtree(child))
 906         continue;
 907       if (delegate_ && !delegate_->ShouldDescendIntoChildForEventHandling(
 908               child, local_point))
 909         continue;
 910     }
 911
 912     gfx::Point point_in_child_coords(local_point);
 913     ConvertPointToTarget(this, child, &point_in_child_coords);
 914     Window* match = child->GetWindowForPoint(point_in_child_coords,
 915                                              return_tightest,
 916                                              for_event_handling);
 917     if (match)
 918       return match;
 919   }
 920
 921   return delegate_ ? this : NULL;
 922 }
 923
 924 void Window::RemoveChildImpl(Window* child, Window* new_parent) {
 925   if (layout_manager_)
 926     layout_manager_->OnWillRemoveWindowFromLayout(child);
 927   FOR_EACH_OBSERVER(WindowObserver, observers_, OnWillRemoveWindow(child));
 928   Window* root_window = child->GetRootWindow();
 929   Window* new_root_window = new_parent ? new_parent->GetRootWindow() : NULL;
 930   if (root_window && root_window != new_root_window)
 931     child->NotifyRemovingFromRootWindow(new_root_window);
 932
 933   if (child->OwnsLayer())
 934     layer()->Remove(child->layer());
 935   child->parent_ = NULL;
 936   Windows::iterator i = std::find(children_.begin(), children_.end(), child);
 937   DCHECK(i != children_.end());
 938   children_.erase(i);
 939   child->OnParentChanged();
 940   if (layout_manager_)
 941     layout_manager_->OnWindowRemovedFromLayout(child);
 942 }
 943
 944 void Window::ReparentLayers(ui::Layer* parent_layer,
 945                             const gfx::Vector2d& offset) {
 946   if (!layer()) {
 947     for (size_t i = 0; i < children_.size(); ++i) {
 948       children_[i]->ReparentLayers(
 949           parent_layer,
 950           offset + children_[i]->bounds().OffsetFromOrigin());
 951     }
 952   } else {
 953     const gfx::Rect real_bounds(bounds());
 954     parent_layer->Add(layer());
 955     gfx::Rect layer_bounds(layer()->bounds().size());
 956     layer_bounds += offset;
 957     layer()->SetBounds(layer_bounds);
 958     bounds_ = real_bounds;
 959   }
 960 }
 961
 962 void Window::OffsetLayerBounds(const gfx::Vector2d& offset) {
 963   if (!layer()) {
 964     for (size_t i = 0; i < children_.size(); ++i)
 965       children_[i]->OffsetLayerBounds(offset);
 966   } else {
 967     gfx::Rect layer_bounds(layer()->bounds());
 968     layer_bounds += offset;
 969     layer()->SetBounds(layer_bounds);
 970   }
 971 }
 972
 973 void Window::OnParentChanged() {
 974   FOR_EACH_OBSERVER(
 975       WindowObserver, observers_, OnWindowParentChanged(this, parent_));
 976 }
 977
 978 void Window::StackChildRelativeTo(Window* child,
 979                                   Window* target,
 980                                   StackDirection direction) {
 981   DCHECK_NE(child, target);
 982   DCHECK(child);
 983   DCHECK(target);
 984   DCHECK_EQ(this, child->parent());
 985   DCHECK_EQ(this, target->parent());
 986
 987   client::WindowStackingClient* stacking_client =
 988       client::GetWindowStackingClient();
 989   if (stacking_client &&
 990       !stacking_client->AdjustStacking(&child, &target, &direction))
 991     return;
 992
 993   const size_t child_i =
 994       std::find(children_.begin(), children_.end(), child) - children_.begin();
 995   const size_t target_i =
 996       std::find(children_.begin(), children_.end(), target) - children_.begin();
 997
 998   // Don't move the child if it is already in the right place.
 999   if ((direction == STACK_ABOVE && child_i == target_i + 1) ||
1000       (direction == STACK_BELOW && child_i + 1 == target_i))
1001     return;
1002
1003   const size_t dest_i =
1004       direction == STACK_ABOVE ?
1005       (child_i < target_i ? target_i : target_i + 1) :
1006       (child_i < target_i ? target_i - 1 : target_i);
1007   children_.erase(children_.begin() + child_i);
1008   children_.insert(children_.begin() + dest_i, child);
1009
1010   StackChildLayerRelativeTo(child, target, direction);
1011
1012   child->OnStackingChanged();
1013 }
1014
1015 void Window::StackChildLayerRelativeTo(Window* child,
1016                                        Window* target,
1017                                        StackDirection direction) {
1018   DCHECK(layer());
1019   if (child->layer() && target->layer()) {
1020     if (direction == STACK_ABOVE)
1021       layer()->StackAbove(child->layer(), target->layer());
1022     else
1023       layer()->StackBelow(child->layer(), target->layer());
1024     return;
1025   }
1026   typedef std::vector<ui::Layer*> Layers;
1027   Layers layers;
1028   GetLayersToStack(child, &layers);
1029   if (layers.empty())
1030     return;
1031
1032   ui::Layer* target_layer;
1033   if (direction == STACK_ABOVE) {
1034     target_layer =
1035         FindStackingTargetLayer<Windows::const_reverse_iterator>(target, child);
1036   } else {
1037     target_layer =
1038         FindStackingTargetLayer<Windows::const_iterator>(target, child);
1039   }
1040
1041   if (!target_layer) {
1042     if (direction == STACK_ABOVE) {
1043       for (Layers::const_reverse_iterator i = layers.rbegin(),
1044                rend = layers.rend(); i != rend; ++i) {
1045         layer()->StackAtBottom(*i);
1046       }
1047     } else {
1048       for (Layers::const_iterator i = layers.begin(); i != layers.end(); ++i)
1049         layer()->StackAtTop(*i);
1050     }
1051     return;
1052   }
1053
1054   if (direction == STACK_ABOVE) {
1055     for (Layers::const_reverse_iterator i = layers.rbegin(),
1056              rend = layers.rend(); i != rend; ++i) {
1057       layer()->StackAbove(*i, target_layer);
1058     }
1059   } else {
1060     for (Layers::const_iterator i = layers.begin(); i != layers.end(); ++i)
1061       layer()->StackBelow(*i, target_layer);
1062   }
1063 }
1064
1065 void Window::OnStackingChanged() {
1066   FOR_EACH_OBSERVER(WindowObserver, observers_, OnWindowStackingChanged(this));
1067 }
1068
1069 void Window::NotifyRemovingFromRootWindow(Window* new_root) {
1070   FOR_EACH_OBSERVER(WindowObserver, observers_,
1071                     OnWindowRemovingFromRootWindow(this, new_root));
1072   for (Window::Windows::const_iterator it = children_.begin();
1073        it != children_.end(); ++it) {
1074     (*it)->NotifyRemovingFromRootWindow(new_root);
1075   }
1076 }
1077
1078 void Window::NotifyAddedToRootWindow() {
1079   FOR_EACH_OBSERVER(WindowObserver, observers_,
1080                     OnWindowAddedToRootWindow(this));
1081   for (Window::Windows::const_iterator it = children_.begin();
1082        it != children_.end(); ++it) {
1083     (*it)->NotifyAddedToRootWindow();
1084   }
1085 }
1086
1087 void Window::NotifyWindowHierarchyChange(
1088     const WindowObserver::HierarchyChangeParams& params) {
1089   params.target->NotifyWindowHierarchyChangeDown(params);
1090   switch (params.phase) {
1091   case WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGING:
1092     if (params.old_parent)
1093       params.old_parent->NotifyWindowHierarchyChangeUp(params);
1094     break;
1095   case WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGED:
1096     if (params.new_parent)
1097       params.new_parent->NotifyWindowHierarchyChangeUp(params);
1098     break;
1099   default:
1100     NOTREACHED();
1101     break;
1102   }
1103 }
1104
1105 void Window::NotifyWindowHierarchyChangeDown(
1106     const WindowObserver::HierarchyChangeParams& params) {
1107   NotifyWindowHierarchyChangeAtReceiver(params);
1108   for (Window::Windows::const_iterator it = children_.begin();
1109        it != children_.end(); ++it) {
1110     (*it)->NotifyWindowHierarchyChangeDown(params);
1111   }
1112 }
1113
1114 void Window::NotifyWindowHierarchyChangeUp(
1115     const WindowObserver::HierarchyChangeParams& params) {
1116   for (Window* window = this; window; window = window->parent())
1117     window->NotifyWindowHierarchyChangeAtReceiver(params);
1118 }
1119
1120 void Window::NotifyWindowHierarchyChangeAtReceiver(
1121     const WindowObserver::HierarchyChangeParams& params) {
1122   WindowObserver::HierarchyChangeParams local_params = params;
1123   local_params.receiver = this;
1124
1125   switch (params.phase) {
1126   case WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGING:
1127     FOR_EACH_OBSERVER(WindowObserver, observers_,
1128                       OnWindowHierarchyChanging(local_params));
1129     break;
1130   case WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGED:
1131     FOR_EACH_OBSERVER(WindowObserver, observers_,
1132                       OnWindowHierarchyChanged(local_params));
1133     break;
1134   default:
1135     NOTREACHED();
1136     break;
1137   }
1138 }
1139
1140 void Window::NotifyWindowVisibilityChanged(aura::Window* target,
1141                                            bool visible) {
1142   if (!NotifyWindowVisibilityChangedDown(target, visible)) {
1143     return; // |this| has been deleted.
1144   }
1145   NotifyWindowVisibilityChangedUp(target, visible);
1146 }
1147
1148 bool Window::NotifyWindowVisibilityChangedAtReceiver(aura::Window* target,
1149                                                      bool visible) {
1150   // |this| may be deleted during a call to OnWindowVisibilityChanged() on one
1151   // of the observers. We create an local observer for that. In that case we
1152   // exit without further access to any members.
1153   WindowTracker tracker;
1154   tracker.Add(this);
1155   FOR_EACH_OBSERVER(WindowObserver, observers_,
1156                     OnWindowVisibilityChanged(target, visible));
1157   return tracker.Contains(this);
1158 }
1159
1160 bool Window::NotifyWindowVisibilityChangedDown(aura::Window* target,
1161                                                bool visible) {
1162   if (!NotifyWindowVisibilityChangedAtReceiver(target, visible))
1163     return false; // |this| was deleted.
1164   std::set<const Window*> child_already_processed;
1165   bool child_destroyed = false;
1166   do {
1167     child_destroyed = false;
1168     for (Window::Windows::const_iterator it = children_.begin();
1169          it != children_.end(); ++it) {
1170       if (!child_already_processed.insert(*it).second)
1171         continue;
1172       if (!(*it)->NotifyWindowVisibilityChangedDown(target, visible)) {
1173         // |*it| was deleted, |it| is invalid and |children_| has changed.
1174         // We exit the current for-loop and enter a new one.
1175         child_destroyed = true;
1176         break;
1177       }
1178     }
1179   } while (child_destroyed);
1180   return true;
1181 }
1182
1183 void Window::NotifyWindowVisibilityChangedUp(aura::Window* target,
1184                                              bool visible) {
1185   // Start with the parent as we already notified |this|
1186   // in NotifyWindowVisibilityChangedDown.
1187   for (Window* window = parent(); window; window = window->parent()) {
1188     bool ret = window->NotifyWindowVisibilityChangedAtReceiver(target, visible);
1189     DCHECK(ret);
1190   }
1191 }
1192
1193 void Window::NotifyAncestorWindowTransformed(Window* source) {
1194   FOR_EACH_OBSERVER(WindowObserver, observers_,
1195                     OnAncestorWindowTransformed(source, this));
1196   for (Window::Windows::const_iterator it = children_.begin();
1197        it != children_.end(); ++it) {
1198     (*it)->NotifyAncestorWindowTransformed(source);
1199   }
1200 }
1201
1202 void Window::OnWindowBoundsChanged(const gfx::Rect& old_bounds) {
1203   bounds_ = layer()->bounds();
1204   if (layout_manager_)
1205     layout_manager_->OnWindowResized();
1206   if (delegate_)
1207     delegate_->OnBoundsChanged(old_bounds, bounds());
1208   FOR_EACH_OBSERVER(WindowObserver,
1209                     observers_,
1210                     OnWindowBoundsChanged(this, old_bounds, bounds()));
1211 }
1212
1213 bool Window::CleanupGestureState() {
1214   bool state_modified = false;
1215   state_modified |= ui::GestureRecognizer::Get()->CancelActiveTouches(this);
1216   state_modified |=
1217       ui::GestureRecognizer::Get()->CleanupStateForConsumer(this);
1218   for (Window::Windows::iterator iter = children_.begin();
1219        iter != children_.end();
1220        ++iter) {
1221     state_modified |= (*iter)->CleanupGestureState();
1222   }
1223   return state_modified;
1224 }
1225
1226 void Window::OnPaintLayer(const ui::PaintContext& context) {
1227   Paint(context);
1228 }
1229
1230 void Window::OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) {
1231   DCHECK(layer());
1232   FOR_EACH_OBSERVER(WindowObserver,
1233                     observers_,
1234                     OnDelegatedFrameDamage(this, damage_rect_in_dip));
1235 }
1236
1237 base::Closure Window::PrepareForLayerBoundsChange() {
1238   return base::Bind(&Window::OnWindowBoundsChanged, base::Unretained(this),
1239                     bounds());
1240 }
1241
1242 bool Window::CanAcceptEvent(const ui::Event& event) {
1243   // The client may forbid certain windows from receiving events at a given
1244   // point in time.
1245   client::EventClient* client = client::GetEventClient(GetRootWindow());
1246   if (client && !client->CanProcessEventsWithinSubtree(this))
1247     return false;
1248
1249   // We need to make sure that a touch cancel event and any gesture events it
1250   // creates can always reach the window. This ensures that we receive a valid
1251   // touch / gesture stream.
1252   if (event.IsEndingEvent())
1253     return true;
1254
1255   if (!IsVisible())
1256     return false;
1257
1258   // The top-most window can always process an event.
1259   if (!parent_)
1260     return true;
1261
1262   // For located events (i.e. mouse, touch etc.), an assumption is made that
1263   // windows that don't have a default event-handler cannot process the event
1264   // (see more in GetWindowForPoint()). This assumption is not made for key
1265   // events.
1266   return event.IsKeyEvent() || target_handler();
1267 }
1268
1269 ui::EventTarget* Window::GetParentTarget() {
1270   if (IsRootWindow()) {
1271     return client::GetEventClient(this) ?
1272         client::GetEventClient(this)->GetToplevelEventTarget() :
1273             Env::GetInstance();
1274   }
1275   return parent_;
1276 }
1277
1278 scoped_ptr<ui::EventTargetIterator> Window::GetChildIterator() const {
1279   return make_scoped_ptr(new ui::EventTargetIteratorImpl<Window>(children()));
1280 }
1281
1282 ui::EventTargeter* Window::GetEventTargeter() {
1283   return targeter_.get();
1284 }
1285
1286 void Window::ConvertEventToTarget(ui::EventTarget* target,
1287                                   ui::LocatedEvent* event) {
1288   event->ConvertLocationToTarget(this,
1289                                  static_cast<Window*>(target));
1290 }
1291
1292 void Window::UpdateLayerName() {
1293 #if !defined(NDEBUG)
1294   DCHECK(layer());
1295
1296   std::string layer_name(name_);
1297   if (layer_name.empty())
1298     layer_name = "Unnamed Window";
1299
1300   if (id_ != -1)
1301     layer_name += " " + base::IntToString(id_);
1302
1303   layer()->set_name(layer_name);
1304 #endif
1305 }
1306
1307 }  // namespace aura