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/strings/string_number_conversions.h"
  14 #include "base/strings/string_util.h"
  15 #include "base/strings/stringprintf.h"
  16 #include "ui/aura/client/capture_client.h"
  17 #include "ui/aura/client/cursor_client.h"
  18 #include "ui/aura/client/event_client.h"
  19 #include "ui/aura/client/focus_client.h"
  20 #include "ui/aura/client/screen_position_client.h"
  21 #include "ui/aura/client/visibility_client.h"
  22 #include "ui/aura/client/window_stacking_client.h"
  23 #include "ui/aura/env.h"
  24 #include "ui/aura/layout_manager.h"
  25 #include "ui/aura/window_delegate.h"
  26 #include "ui/aura/window_event_dispatcher.h"
  27 #include "ui/aura/window_observer.h"
  28 #include "ui/aura/window_tracker.h"
  29 #include "ui/aura/window_tree_host.h"
  30 #include "ui/compositor/compositor.h"
  31 #include "ui/compositor/layer.h"
  32 #include "ui/events/event_target_iterator.h"
  33 #include "ui/gfx/canvas.h"
  34 #include "ui/gfx/path.h"
  35 #include "ui/gfx/scoped_canvas.h"
  36 #include "ui/gfx/screen.h"
  37
  38 namespace aura {
  39
  40 namespace {
  41
  42 ui::LayerType WindowLayerTypeToUILayerType(WindowLayerType window_layer_type) {
  43   switch (window_layer_type) {
  44     case WINDOW_LAYER_NONE:
  45       break;
  46     case WINDOW_LAYER_NOT_DRAWN:
  47       return ui::LAYER_NOT_DRAWN;
  48     case WINDOW_LAYER_TEXTURED:
  49       return ui::LAYER_TEXTURED;
  50     case WINDOW_LAYER_SOLID_COLOR:
  51       return ui::LAYER_SOLID_COLOR;
  52   }
  53   NOTREACHED();
  54   return ui::LAYER_NOT_DRAWN;
  55 }
  56
  57 // Used when searching for a Window to stack relative to.
  58 template <class T>
  59 T IteratorForDirectionBegin(aura::Window* window);
  60
  61 template <>
  62 Window::Windows::const_iterator IteratorForDirectionBegin(
  63     aura::Window* window) {
  64   return window->children().begin();
  65 }
  66
  67 template <>
  68 Window::Windows::const_reverse_iterator IteratorForDirectionBegin(
  69     aura::Window* window) {
  70   return window->children().rbegin();
  71 }
  72
  73 template <class T>
  74 T IteratorForDirectionEnd(aura::Window* window);
  75
  76 template <>
  77 Window::Windows::const_iterator IteratorForDirectionEnd(aura::Window* window) {
  78   return window->children().end();
  79 }
  80
  81 template <>
  82 Window::Windows::const_reverse_iterator IteratorForDirectionEnd(
  83     aura::Window* window) {
  84   return window->children().rend();
  85 }
  86
  87 // Depth first search for the first Window with a layer to stack relative
  88 // to. Starts at target. Does not descend into |ignore|.
  89 template <class T>
  90 ui::Layer* FindStackingTargetLayerDown(aura::Window* target,
  91                                        aura::Window* ignore) {
  92   if (target == ignore)
  93     return NULL;
  94
  95   if (target->layer())
  96     return target->layer();
  97
  98   for (T i = IteratorForDirectionBegin<T>(target);
  99        i != IteratorForDirectionEnd<T>(target); ++i) {
 100     ui::Layer* layer = FindStackingTargetLayerDown<T>(*i, ignore);
 101     if (layer)
 102       return layer;
 103   }
 104   return NULL;
 105 }
 106
 107 // Depth first search through the siblings of |target||. This does not search
 108 // all the siblings, only those before/after |target| (depening upon the
 109 // template type) and ignoring |ignore|. Returns the Layer of the first Window
 110 // encountered with a Layer.
 111 template <class T>
 112 ui::Layer* FindStackingLayerInSiblings(aura::Window* target,
 113                                        aura::Window* ignore) {
 114   aura::Window* parent = target->parent();
 115   for (T i = std::find(IteratorForDirectionBegin<T>(parent),
 116                   IteratorForDirectionEnd<T>(parent), target);
 117        i != IteratorForDirectionEnd<T>(parent); ++i) {
 118     ui::Layer* layer = FindStackingTargetLayerDown<T>(*i, ignore);
 119     if (layer)
 120       return layer;
 121   }
 122   return NULL;
 123 }
 124
 125 // Returns the first Window that has a Layer. This does a depth first search
 126 // through the descendants of |target| first, then ascends up doing a depth
 127 // first search through siblings of all ancestors until a Layer is found or an
 128 // ancestor with a layer is found. This is intended to locate a layer to stack
 129 // other layers relative to.
 130 template <class T>
 131 ui::Layer* FindStackingTargetLayer(aura::Window* target, aura::Window* ignore) {
 132   ui::Layer* result = FindStackingTargetLayerDown<T>(target, ignore);
 133   if (result)
 134     return result;
 135   while (target->parent()) {
 136     ui::Layer* result = FindStackingLayerInSiblings<T>(target, ignore);
 137     if (result)
 138       return result;
 139     target = target->parent();
 140     if (target->layer())
 141       return NULL;
 142   }
 143   return NULL;
 144 }
 145
 146 // Does a depth first search for all descendants of |child| that have layers.
 147 // This stops at any descendants that have layers (and adds them to |layers|).
 148 void GetLayersToStack(aura::Window* child, std::vector<ui::Layer*>* layers) {
 149   if (child->layer()) {
 150     layers->push_back(child->layer());
 151     return;
 152   }
 153   for (size_t i = 0; i < child->children().size(); ++i)
 154     GetLayersToStack(child->children()[i], layers);
 155 }
 156
 157 }  // namespace
 158
 159 class ScopedCursorHider {
 160  public:
 161   explicit ScopedCursorHider(Window* window)
 162       : window_(window),
 163         hid_cursor_(false) {
 164     if (!window_->IsRootWindow())
 165       return;
 166     const bool cursor_is_in_bounds = window_->GetBoundsInScreen().Contains(
 167         Env::GetInstance()->last_mouse_location());
 168     client::CursorClient* cursor_client = client::GetCursorClient(window_);
 169     if (cursor_is_in_bounds && cursor_client &&
 170         cursor_client->IsCursorVisible()) {
 171       cursor_client->HideCursor();
 172       hid_cursor_ = true;
 173     }
 174   }
 175   ~ScopedCursorHider() {
 176     if (!window_->IsRootWindow())
 177       return;
 178
 179     // Update the device scale factor of the cursor client only when the last
 180     // mouse location is on this root window.
 181     if (hid_cursor_) {
 182       client::CursorClient* cursor_client = client::GetCursorClient(window_);
 183       if (cursor_client) {
 184         const gfx::Display& display =
 185             gfx::Screen::GetScreenFor(window_)->GetDisplayNearestWindow(
 186                 window_);
 187         cursor_client->SetDisplay(display);
 188         cursor_client->ShowCursor();
 189       }
 190     }
 191   }
 192
 193  private:
 194   Window* window_;
 195   bool hid_cursor_;
 196
 197   DISALLOW_COPY_AND_ASSIGN(ScopedCursorHider);
 198 };
 199
 200 Window::Window(WindowDelegate* delegate)
 201     : host_(NULL),
 202       type_(ui::wm::WINDOW_TYPE_UNKNOWN),
 203       owned_by_parent_(true),
 204       delegate_(delegate),
 205       parent_(NULL),
 206       visible_(false),
 207       id_(-1),
 208       transparent_(false),
 209       user_data_(NULL),
 210       ignore_events_(false),
 211       // Don't notify newly added observers during notification. This causes
 212       // problems for code that adds an observer as part of an observer
 213       // notification (such as the workspace code).
 214       observers_(ObserverList<WindowObserver>::NOTIFY_EXISTING_ONLY) {
 215   set_target_handler(delegate_);
 216 }
 217
 218 Window::~Window() {
 219   // |layer()| can be NULL during tests, or if this Window is layerless.
 220   if (layer()) {
 221     if (layer()->owner() == this)
 222       layer()->CompleteAllAnimations();
 223     layer()->SuppressPaint();
 224   }
 225
 226   // Let the delegate know we're in the processing of destroying.
 227   if (delegate_)
 228     delegate_->OnWindowDestroying(this);
 229   FOR_EACH_OBSERVER(WindowObserver, observers_, OnWindowDestroying(this));
 230
 231   // TODO(beng): See comment in window_event_dispatcher.h. This shouldn't be
 232   //             necessary but unfortunately is right now due to ordering
 233   //             peculiarities. WED must be notified _after_ other observers
 234   //             are notified of pending teardown but before the hierarchy
 235   //             is actually torn down.
 236   WindowTreeHost* host = GetHost();
 237   if (host)
 238     host->dispatcher()->OnPostNotifiedWindowDestroying(this);
 239
 240   // The window should have already had its state cleaned up in
 241   // WindowEventDispatcher::OnWindowHidden(), but there have been some crashes
 242   // involving windows being destroyed without being hidden first. See
 243   // crbug.com/342040. This should help us debug the issue. TODO(tdresser):
 244   // remove this once we determine why we have windows that are destroyed
 245   // without being hidden.
 246   bool window_incorrectly_cleaned_up = CleanupGestureState();
 247   CHECK(!window_incorrectly_cleaned_up);
 248
 249   // Then destroy the children.
 250   RemoveOrDestroyChildren();
 251
 252   // The window needs to be removed from the parent before calling the
 253   // WindowDestroyed callbacks of delegate and the observers.
 254   if (parent_)
 255     parent_->RemoveChild(this);
 256
 257   if (delegate_)
 258     delegate_->OnWindowDestroyed(this);
 259   ObserverListBase<WindowObserver>::Iterator iter(observers_);
 260   for (WindowObserver* observer = iter.GetNext(); observer;
 261        observer = iter.GetNext()) {
 262     RemoveObserver(observer);
 263     observer->OnWindowDestroyed(this);
 264   }
 265
 266   // Clear properties.
 267   for (std::map<const void*, Value>::const_iterator iter = prop_map_.begin();
 268        iter != prop_map_.end();
 269        ++iter) {
 270     if (iter->second.deallocator)
 271       (*iter->second.deallocator)(iter->second.value);
 272   }
 273   prop_map_.clear();
 274
 275   // If we have layer it will either be destroyed by |layer_owner_|'s dtor, or
 276   // by whoever acquired it. We don't have a layer if Init() wasn't invoked or
 277   // we are layerless.
 278   if (layer())
 279     layer()->set_delegate(NULL);
 280   DestroyLayer();
 281 }
 282
 283 void Window::Init(WindowLayerType window_layer_type) {
 284   if (window_layer_type != WINDOW_LAYER_NONE) {
 285     SetLayer(new ui::Layer(WindowLayerTypeToUILayerType(window_layer_type)));
 286     layer()->SetVisible(false);
 287     layer()->set_delegate(this);
 288     UpdateLayerName();
 289     layer()->SetFillsBoundsOpaquely(!transparent_);
 290   }
 291
 292   Env::GetInstance()->NotifyWindowInitialized(this);
 293 }
 294
 295 void Window::SetType(ui::wm::WindowType type) {
 296   // Cannot change type after the window is initialized.
 297   DCHECK(!layer());
 298   type_ = type;
 299 }
 300
 301 void Window::SetName(const std::string& name) {
 302   name_ = name;
 303
 304   if (layer())
 305     UpdateLayerName();
 306 }
 307
 308 void Window::SetTitle(const base::string16& title) {
 309   title_ = title;
 310   FOR_EACH_OBSERVER(WindowObserver,
 311                     observers_,
 312                     OnWindowTitleChanged(this));
 313 }
 314
 315 void Window::SetTransparent(bool transparent) {
 316   transparent_ = transparent;
 317   if (layer())
 318     layer()->SetFillsBoundsOpaquely(!transparent_);
 319 }
 320
 321 void Window::SetFillsBoundsCompletely(bool fills_bounds) {
 322   if (layer())
 323     layer()->SetFillsBoundsCompletely(fills_bounds);
 324 }
 325
 326 Window* Window::GetRootWindow() {
 327   return const_cast<Window*>(
 328       static_cast<const Window*>(this)->GetRootWindow());
 329 }
 330
 331 const Window* Window::GetRootWindow() const {
 332   return IsRootWindow() ? this : parent_ ? parent_->GetRootWindow() : NULL;
 333 }
 334
 335 WindowTreeHost* Window::GetHost() {
 336   return const_cast<WindowTreeHost*>(const_cast<const Window*>(this)->
 337       GetHost());
 338 }
 339
 340 const WindowTreeHost* Window::GetHost() const {
 341   const Window* root_window = GetRootWindow();
 342   return root_window ? root_window->host_ : NULL;
 343 }
 344
 345 void Window::Show() {
 346   if (layer()) {
 347     DCHECK_EQ(visible_, layer()->GetTargetVisibility());
 348     // It is not allowed that a window is visible but the layers alpha is fully
 349     // transparent since the window would still be considered to be active but
 350     // could not be seen.
 351     DCHECK(!(visible_ && layer()->GetTargetOpacity() == 0.0f));
 352   }
 353   SetVisible(true);
 354 }
 355
 356 void Window::Hide() {
 357   // RootWindow::OnVisibilityChanged will call ReleaseCapture.
 358   SetVisible(false);
 359 }
 360
 361 bool Window::IsVisible() const {
 362   // Layer visibility can be inconsistent with window visibility, for example
 363   // when a Window is hidden, we want this function to return false immediately
 364   // after, even though the client may decide to animate the hide effect (and
 365   // so the layer will be visible for some time after Hide() is called).
 366   for (const Window* window = this; window; window = window->parent()) {
 367     if (!window->visible_)
 368       return false;
 369     if (window->layer())
 370       return window->layer()->IsDrawn();
 371   }
 372   return false;
 373 }
 374
 375 gfx::Rect Window::GetBoundsInRootWindow() const {
 376   // TODO(beng): There may be a better way to handle this, and the existing code
 377   //             is likely wrong anyway in a multi-display world, but this will
 378   //             do for now.
 379   if (!GetRootWindow())
 380     return bounds();
 381   gfx::Point origin = bounds().origin();
 382   ConvertPointToTarget(parent_, GetRootWindow(), &origin);
 383   return gfx::Rect(origin, bounds().size());
 384 }
 385
 386 gfx::Rect Window::GetBoundsInScreen() const {
 387   gfx::Rect bounds(GetBoundsInRootWindow());
 388   const Window* root = GetRootWindow();
 389   if (root) {
 390     aura::client::ScreenPositionClient* screen_position_client =
 391         aura::client::GetScreenPositionClient(root);
 392     if (screen_position_client) {
 393       gfx::Point origin = bounds.origin();
 394       screen_position_client->ConvertPointToScreen(root, &origin);
 395       bounds.set_origin(origin);
 396     }
 397   }
 398   return bounds;
 399 }
 400
 401 void Window::SetTransform(const gfx::Transform& transform) {
 402   if (!layer()) {
 403     // Transforms aren't supported on layerless windows.
 404     NOTREACHED();
 405     return;
 406   }
 407   FOR_EACH_OBSERVER(WindowObserver, observers_,
 408                     OnWindowTransforming(this));
 409   layer()->SetTransform(transform);
 410   FOR_EACH_OBSERVER(WindowObserver, observers_,
 411                     OnWindowTransformed(this));
 412 }
 413
 414 void Window::SetLayoutManager(LayoutManager* layout_manager) {
 415   if (layout_manager == layout_manager_)
 416     return;
 417   layout_manager_.reset(layout_manager);
 418   if (!layout_manager)
 419     return;
 420   // If we're changing to a new layout manager, ensure it is aware of all the
 421   // existing child windows.
 422   for (Windows::const_iterator it = children_.begin();
 423        it != children_.end();
 424        ++it)
 425     layout_manager_->OnWindowAddedToLayout(*it);
 426 }
 427
 428 scoped_ptr<ui::EventTargeter>
 429 Window::SetEventTargeter(scoped_ptr<ui::EventTargeter> targeter) {
 430   scoped_ptr<ui::EventTargeter> old_targeter = targeter_.Pass();
 431   targeter_ = targeter.Pass();
 432   return old_targeter.Pass();
 433 }
 434
 435 void Window::SetBounds(const gfx::Rect& new_bounds) {
 436   if (parent_ && parent_->layout_manager())
 437     parent_->layout_manager()->SetChildBounds(this, new_bounds);
 438   else {
 439     // Ensure we don't go smaller than our minimum bounds.
 440     gfx::Rect final_bounds(new_bounds);
 441     if (delegate_) {
 442       const gfx::Size& min_size = delegate_->GetMinimumSize();
 443       final_bounds.set_width(std::max(min_size.width(), final_bounds.width()));
 444       final_bounds.set_height(std::max(min_size.height(),
 445                                        final_bounds.height()));
 446     }
 447     SetBoundsInternal(final_bounds);
 448   }
 449 }
 450
 451 void Window::SetBoundsInScreen(const gfx::Rect& new_bounds_in_screen,
 452                                const gfx::Display& dst_display) {
 453   Window* root = GetRootWindow();
 454   if (root) {
 455     gfx::Point origin = new_bounds_in_screen.origin();
 456     aura::client::ScreenPositionClient* screen_position_client =
 457         aura::client::GetScreenPositionClient(root);
 458     screen_position_client->SetBounds(this, new_bounds_in_screen, dst_display);
 459     return;
 460   }
 461   SetBounds(new_bounds_in_screen);
 462 }
 463
 464 gfx::Rect Window::GetTargetBounds() const {
 465   if (!layer())
 466     return bounds();
 467
 468   if (!parent_ || parent_->layer())
 469     return layer()->GetTargetBounds();
 470
 471   // We have a layer but our parent (who is valid) doesn't. This means the
 472   // coordinates of the layer are relative to the first ancestor with a layer;
 473   // convert to be relative to parent.
 474   gfx::Vector2d offset;
 475   const aura::Window* ancestor_with_layer =
 476       parent_->GetAncestorWithLayer(&offset);
 477   if (!ancestor_with_layer)
 478     return layer()->GetTargetBounds();
 479
 480   gfx::Rect layer_target_bounds = layer()->GetTargetBounds();
 481   layer_target_bounds -= offset;
 482   return layer_target_bounds;
 483 }
 484
 485 void Window::SchedulePaintInRect(const gfx::Rect& rect) {
 486   if (!layer() && parent_) {
 487     // Notification of paint scheduled happens for the window with a layer.
 488     gfx::Rect parent_rect(bounds().size());
 489     parent_rect.Intersect(rect);
 490     if (!parent_rect.IsEmpty()) {
 491       parent_rect.Offset(bounds().origin().OffsetFromOrigin());
 492       parent_->SchedulePaintInRect(parent_rect);
 493     }
 494   } else if (layer()) {
 495     layer()->SchedulePaint(rect);
 496   }
 497 }
 498
 499 void Window::StackChildAtTop(Window* child) {
 500   if (children_.size() <= 1 || child == children_.back())
 501     return;  // In the front already.
 502   StackChildAbove(child, children_.back());
 503 }
 504
 505 void Window::StackChildAbove(Window* child, Window* target) {
 506   StackChildRelativeTo(child, target, STACK_ABOVE);
 507 }
 508
 509 void Window::StackChildAtBottom(Window* child) {
 510   if (children_.size() <= 1 || child == children_.front())
 511     return;  // At the bottom already.
 512   StackChildBelow(child, children_.front());
 513 }
 514
 515 void Window::StackChildBelow(Window* child, Window* target) {
 516   StackChildRelativeTo(child, target, STACK_BELOW);
 517 }
 518
 519 void Window::AddChild(Window* child) {
 520   WindowObserver::HierarchyChangeParams params;
 521   params.target = child;
 522   params.new_parent = this;
 523   params.old_parent = child->parent();
 524   params.phase = WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGING;
 525   NotifyWindowHierarchyChange(params);
 526
 527   Window* old_root = child->GetRootWindow();
 528
 529   DCHECK(std::find(children_.begin(), children_.end(), child) ==
 530       children_.end());
 531   if (child->parent())
 532     child->parent()->RemoveChildImpl(child, this);
 533
 534   gfx::Vector2d offset;
 535   aura::Window* ancestor_with_layer = GetAncestorWithLayer(&offset);
 536
 537   child->parent_ = this;
 538
 539   if (ancestor_with_layer) {
 540     offset += child->bounds().OffsetFromOrigin();
 541     child->ReparentLayers(ancestor_with_layer->layer(), offset);
 542   }
 543
 544   children_.push_back(child);
 545   if (layout_manager_)
 546     layout_manager_->OnWindowAddedToLayout(child);
 547   FOR_EACH_OBSERVER(WindowObserver, observers_, OnWindowAdded(child));
 548   child->OnParentChanged();
 549
 550   Window* root_window = GetRootWindow();
 551   if (root_window && old_root != root_window) {
 552     root_window->GetHost()->dispatcher()->OnWindowAddedToRootWindow(child);
 553     child->NotifyAddedToRootWindow();
 554   }
 555
 556   params.phase = WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGED;
 557   NotifyWindowHierarchyChange(params);
 558 }
 559
 560 void Window::RemoveChild(Window* child) {
 561   WindowObserver::HierarchyChangeParams params;
 562   params.target = child;
 563   params.new_parent = NULL;
 564   params.old_parent = this;
 565   params.phase = WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGING;
 566   NotifyWindowHierarchyChange(params);
 567
 568   RemoveChildImpl(child, NULL);
 569
 570   params.phase = WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGED;
 571   NotifyWindowHierarchyChange(params);
 572 }
 573
 574 bool Window::Contains(const Window* other) const {
 575   for (const Window* parent = other; parent; parent = parent->parent_) {
 576     if (parent == this)
 577       return true;
 578   }
 579   return false;
 580 }
 581
 582 Window* Window::GetChildById(int id) {
 583   return const_cast<Window*>(const_cast<const Window*>(this)->GetChildById(id));
 584 }
 585
 586 const Window* Window::GetChildById(int id) const {
 587   Windows::const_iterator i;
 588   for (i = children_.begin(); i != children_.end(); ++i) {
 589     if ((*i)->id() == id)
 590       return *i;
 591     const Window* result = (*i)->GetChildById(id);
 592     if (result)
 593       return result;
 594   }
 595   return NULL;
 596 }
 597
 598 // static
 599 void Window::ConvertPointToTarget(const Window* source,
 600                                   const Window* target,
 601                                   gfx::Point* point) {
 602   if (!source)
 603     return;
 604   if (source->GetRootWindow() != target->GetRootWindow()) {
 605     client::ScreenPositionClient* source_client =
 606         client::GetScreenPositionClient(source->GetRootWindow());
 607     // |source_client| can be NULL in tests.
 608     if (source_client)
 609       source_client->ConvertPointToScreen(source, point);
 610
 611     client::ScreenPositionClient* target_client =
 612         client::GetScreenPositionClient(target->GetRootWindow());
 613     // |target_client| can be NULL in tests.
 614     if (target_client)
 615       target_client->ConvertPointFromScreen(target, point);
 616   } else if ((source != target) && (!source->layer() || !target->layer())) {
 617     if (!source->layer()) {
 618       gfx::Vector2d offset_to_layer;
 619       source = source->GetAncestorWithLayer(&offset_to_layer);
 620       *point += offset_to_layer;
 621     }
 622     if (!target->layer()) {
 623       gfx::Vector2d offset_to_layer;
 624       target = target->GetAncestorWithLayer(&offset_to_layer);
 625       *point -= offset_to_layer;
 626     }
 627     ui::Layer::ConvertPointToLayer(source->layer(), target->layer(), point);
 628   } else {
 629     ui::Layer::ConvertPointToLayer(source->layer(), target->layer(), point);
 630   }
 631 }
 632
 633 // static
 634 void Window::ConvertRectToTarget(const Window* source,
 635                                  const Window* target,
 636                                  gfx::Rect* rect) {
 637   DCHECK(rect);
 638   gfx::Point origin = rect->origin();
 639   ConvertPointToTarget(source, target, &origin);
 640   rect->set_origin(origin);
 641 }
 642
 643 void Window::MoveCursorTo(const gfx::Point& point_in_window) {
 644   Window* root_window = GetRootWindow();
 645   DCHECK(root_window);
 646   gfx::Point point_in_root(point_in_window);
 647   ConvertPointToTarget(this, root_window, &point_in_root);
 648   root_window->GetHost()->MoveCursorTo(point_in_root);
 649 }
 650
 651 gfx::NativeCursor Window::GetCursor(const gfx::Point& point) const {
 652   return delegate_ ? delegate_->GetCursor(point) : gfx::kNullCursor;
 653 }
 654
 655 void Window::AddObserver(WindowObserver* observer) {
 656   observer->OnObservingWindow(this);
 657   observers_.AddObserver(observer);
 658 }
 659
 660 void Window::RemoveObserver(WindowObserver* observer) {
 661   observer->OnUnobservingWindow(this);
 662   observers_.RemoveObserver(observer);
 663 }
 664
 665 bool Window::HasObserver(WindowObserver* observer) {
 666   return observers_.HasObserver(observer);
 667 }
 668
 669 bool Window::ContainsPointInRoot(const gfx::Point& point_in_root) const {
 670   const Window* root_window = GetRootWindow();
 671   if (!root_window)
 672     return false;
 673   gfx::Point local_point(point_in_root);
 674   ConvertPointToTarget(root_window, this, &local_point);
 675   return gfx::Rect(GetTargetBounds().size()).Contains(local_point);
 676 }
 677
 678 bool Window::ContainsPoint(const gfx::Point& local_point) const {
 679   return gfx::Rect(bounds().size()).Contains(local_point);
 680 }
 681
 682 Window* Window::GetEventHandlerForPoint(const gfx::Point& local_point) {
 683   return GetWindowForPoint(local_point, true, true);
 684 }
 685
 686 Window* Window::GetTopWindowContainingPoint(const gfx::Point& local_point) {
 687   return GetWindowForPoint(local_point, false, false);
 688 }
 689
 690 Window* Window::GetToplevelWindow() {
 691   Window* topmost_window_with_delegate = NULL;
 692   for (aura::Window* window = this; window != NULL; window = window->parent()) {
 693     if (window->delegate())
 694       topmost_window_with_delegate = window;
 695   }
 696   return topmost_window_with_delegate;
 697 }
 698
 699 void Window::Focus() {
 700   client::FocusClient* client = client::GetFocusClient(this);
 701   DCHECK(client);
 702   client->FocusWindow(this);
 703 }
 704
 705 void Window::Blur() {
 706   client::FocusClient* client = client::GetFocusClient(this);
 707   DCHECK(client);
 708   client->FocusWindow(NULL);
 709 }
 710
 711 bool Window::HasFocus() const {
 712   client::FocusClient* client = client::GetFocusClient(this);
 713   return client && client->GetFocusedWindow() == this;
 714 }
 715
 716 bool Window::CanFocus() const {
 717   if (IsRootWindow())
 718     return IsVisible();
 719
 720   // NOTE: as part of focusing the window the ActivationClient may make the
 721   // window visible (by way of making a hidden ancestor visible). For this
 722   // reason we can't check visibility here and assume the client is doing it.
 723   if (!parent_ || (delegate_ && !delegate_->CanFocus()))
 724     return false;
 725
 726   // The client may forbid certain windows from receiving focus at a given point
 727   // in time.
 728   client::EventClient* client = client::GetEventClient(GetRootWindow());
 729   if (client && !client->CanProcessEventsWithinSubtree(this))
 730     return false;
 731
 732   return parent_->CanFocus();
 733 }
 734
 735 bool Window::CanReceiveEvents() const {
 736   if (IsRootWindow())
 737     return IsVisible();
 738
 739   // The client may forbid certain windows from receiving events at a given
 740   // point in time.
 741   client::EventClient* client = client::GetEventClient(GetRootWindow());
 742   if (client && !client->CanProcessEventsWithinSubtree(this))
 743     return false;
 744
 745   return parent_ && IsVisible() && parent_->CanReceiveEvents();
 746 }
 747
 748 void Window::SetCapture() {
 749   if (!IsVisible())
 750     return;
 751
 752   Window* root_window = GetRootWindow();
 753   if (!root_window)
 754     return;
 755   client::CaptureClient* capture_client = client::GetCaptureClient(root_window);
 756   if (!capture_client)
 757     return;
 758   client::GetCaptureClient(root_window)->SetCapture(this);
 759 }
 760
 761 void Window::ReleaseCapture() {
 762   Window* root_window = GetRootWindow();
 763   if (!root_window)
 764     return;
 765   client::CaptureClient* capture_client = client::GetCaptureClient(root_window);
 766   if (!capture_client)
 767     return;
 768   client::GetCaptureClient(root_window)->ReleaseCapture(this);
 769 }
 770
 771 bool Window::HasCapture() {
 772   Window* root_window = GetRootWindow();
 773   if (!root_window)
 774     return false;
 775   client::CaptureClient* capture_client = client::GetCaptureClient(root_window);
 776   return capture_client && capture_client->GetCaptureWindow() == this;
 777 }
 778
 779 void Window::SuppressPaint() {
 780   if (layer())
 781     layer()->SuppressPaint();
 782 }
 783
 784 // {Set,Get,Clear}Property are implemented in window_property.h.
 785
 786 void Window::SetNativeWindowProperty(const char* key, void* value) {
 787   SetPropertyInternal(
 788       key, key, NULL, reinterpret_cast<int64>(value), 0);
 789 }
 790
 791 void* Window::GetNativeWindowProperty(const char* key) const {
 792   return reinterpret_cast<void*>(GetPropertyInternal(key, 0));
 793 }
 794
 795 void Window::OnDeviceScaleFactorChanged(float device_scale_factor) {
 796   ScopedCursorHider hider(this);
 797   if (delegate_)
 798     delegate_->OnDeviceScaleFactorChanged(device_scale_factor);
 799 }
 800
 801 #if !defined(NDEBUG)
 802 std::string Window::GetDebugInfo() const {
 803   return base::StringPrintf(
 804       "%s<%d> bounds(%d, %d, %d, %d) %s %s opacity=%.1f",
 805       name().empty() ? "Unknown" : name().c_str(), id(),
 806       bounds().x(), bounds().y(), bounds().width(), bounds().height(),
 807       visible_ ? "WindowVisible" : "WindowHidden",
 808       layer() ?
 809           (layer()->GetTargetVisibility() ? "LayerVisible" : "LayerHidden") :
 810           "NoLayer",
 811       layer() ? layer()->opacity() : 1.0f);
 812 }
 813
 814 void Window::PrintWindowHierarchy(int depth) const {
 815   VLOG(0) << base::StringPrintf(
 816       "%*s%s", depth * 2, "", GetDebugInfo().c_str());
 817   for (Windows::const_iterator it = children_.begin();
 818        it != children_.end(); ++it) {
 819     Window* child = *it;
 820     child->PrintWindowHierarchy(depth + 1);
 821   }
 822 }
 823 #endif
 824
 825 void Window::RemoveOrDestroyChildren() {
 826   while (!children_.empty()) {
 827     Window* child = children_[0];
 828     if (child->owned_by_parent_) {
 829       delete child;
 830       // Deleting the child so remove it from out children_ list.
 831       DCHECK(std::find(children_.begin(), children_.end(), child) ==
 832              children_.end());
 833     } else {
 834       // Even if we can't delete the child, we still need to remove it from the
 835       // parent so that relevant bookkeeping (parent_ back-pointers etc) are
 836       // updated.
 837       RemoveChild(child);
 838     }
 839   }
 840 }
 841
 842 ///////////////////////////////////////////////////////////////////////////////
 843 // Window, private:
 844
 845 int64 Window::SetPropertyInternal(const void* key,
 846                                   const char* name,
 847                                   PropertyDeallocator deallocator,
 848                                   int64 value,
 849                                   int64 default_value) {
 850   int64 old = GetPropertyInternal(key, default_value);
 851   if (value == default_value) {
 852     prop_map_.erase(key);
 853   } else {
 854     Value prop_value;
 855     prop_value.name = name;
 856     prop_value.value = value;
 857     prop_value.deallocator = deallocator;
 858     prop_map_[key] = prop_value;
 859   }
 860   FOR_EACH_OBSERVER(WindowObserver, observers_,
 861                     OnWindowPropertyChanged(this, key, old));
 862   return old;
 863 }
 864
 865 int64 Window::GetPropertyInternal(const void* key,
 866                                   int64 default_value) const {
 867   std::map<const void*, Value>::const_iterator iter = prop_map_.find(key);
 868   if (iter == prop_map_.end())
 869     return default_value;
 870   return iter->second.value;
 871 }
 872
 873 bool Window::HitTest(const gfx::Point& local_point) {
 874   gfx::Rect local_bounds(bounds().size());
 875   if (!delegate_ || !delegate_->HasHitTestMask())
 876     return local_bounds.Contains(local_point);
 877
 878   gfx::Path mask;
 879   delegate_->GetHitTestMask(&mask);
 880
 881   SkRegion clip_region;
 882   clip_region.setRect(local_bounds.x(), local_bounds.y(),
 883                       local_bounds.width(), local_bounds.height());
 884   SkRegion mask_region;
 885   return mask_region.setPath(mask, clip_region) &&
 886       mask_region.contains(local_point.x(), local_point.y());
 887 }
 888
 889 void Window::SetBoundsInternal(const gfx::Rect& new_bounds) {
 890   gfx::Rect actual_new_bounds(new_bounds);
 891   gfx::Rect old_bounds = GetTargetBounds();
 892
 893   // Always need to set the layer's bounds -- even if it is to the same thing.
 894   // This may cause important side effects such as stopping animation.
 895   if (!layer()) {
 896     const gfx::Vector2d origin_delta = new_bounds.OffsetFromOrigin() -
 897         bounds_.OffsetFromOrigin();
 898     bounds_ = new_bounds;
 899     OffsetLayerBounds(origin_delta);
 900   } else {
 901     if (parent_ && !parent_->layer()) {
 902       gfx::Vector2d offset;
 903       const aura::Window* ancestor_with_layer =
 904           parent_->GetAncestorWithLayer(&offset);
 905       if (ancestor_with_layer)
 906         actual_new_bounds.Offset(offset);
 907     }
 908     layer()->SetBounds(actual_new_bounds);
 909   }
 910
 911   // If we are currently not the layer's delegate, we will not get bounds
 912   // changed notification from the layer (this typically happens after animating
 913   // hidden). We must notify ourselves.
 914   if (!layer() || layer()->delegate() != this)
 915     OnWindowBoundsChanged(old_bounds);
 916 }
 917
 918 void Window::SetVisible(bool visible) {
 919   if ((layer() && visible == layer()->GetTargetVisibility()) ||
 920       (!layer() && visible == visible_))
 921     return;  // No change.
 922
 923   FOR_EACH_OBSERVER(WindowObserver, observers_,
 924                     OnWindowVisibilityChanging(this, visible));
 925
 926   client::VisibilityClient* visibility_client =
 927       client::GetVisibilityClient(this);
 928   if (visibility_client)
 929     visibility_client->UpdateLayerVisibility(this, visible);
 930   else if (layer())
 931     layer()->SetVisible(visible);
 932   visible_ = visible;
 933   SchedulePaint();
 934   if (parent_ && parent_->layout_manager_)
 935     parent_->layout_manager_->OnChildWindowVisibilityChanged(this, visible);
 936
 937   if (delegate_)
 938     delegate_->OnWindowTargetVisibilityChanged(visible);
 939
 940   NotifyWindowVisibilityChanged(this, visible);
 941 }
 942
 943 void Window::SchedulePaint() {
 944   SchedulePaintInRect(gfx::Rect(0, 0, bounds().width(), bounds().height()));
 945 }
 946
 947 void Window::Paint(gfx::Canvas* canvas) {
 948   if (delegate_)
 949     delegate_->OnPaint(canvas);
 950   PaintLayerlessChildren(canvas);
 951 }
 952
 953 void Window::PaintLayerlessChildren(gfx::Canvas* canvas) {
 954   for (size_t i = 0, count = children_.size(); i < count; ++i) {
 955     Window* child = children_[i];
 956     if (!child->layer() && child->visible_) {
 957       gfx::ScopedCanvas scoped_canvas(canvas);
 958       canvas->ClipRect(child->bounds());
 959       if (!canvas->IsClipEmpty()) {
 960         canvas->Translate(child->bounds().OffsetFromOrigin());
 961         child->Paint(canvas);
 962       }
 963     }
 964   }
 965 }
 966
 967 Window* Window::GetWindowForPoint(const gfx::Point& local_point,
 968                                   bool return_tightest,
 969                                   bool for_event_handling) {
 970   if (!IsVisible())
 971     return NULL;
 972
 973   if ((for_event_handling && !HitTest(local_point)) ||
 974       (!for_event_handling && !ContainsPoint(local_point)))
 975     return NULL;
 976
 977   // Check if I should claim this event and not pass it to my children because
 978   // the location is inside my hit test override area.  For details, see
 979   // set_hit_test_bounds_override_inner().
 980   if (for_event_handling && !hit_test_bounds_override_inner_.empty()) {
 981     gfx::Rect inset_local_bounds(gfx::Point(), bounds().size());
 982     inset_local_bounds.Inset(hit_test_bounds_override_inner_);
 983     // We know we're inside the normal local bounds, so if we're outside the
 984     // inset bounds we must be in the special hit test override area.
 985     DCHECK(HitTest(local_point));
 986     if (!inset_local_bounds.Contains(local_point))
 987       return delegate_ ? this : NULL;
 988   }
 989
 990   if (!return_tightest && delegate_)
 991     return this;
 992
 993   for (Windows::const_reverse_iterator it = children_.rbegin(),
 994            rend = children_.rend();
 995        it != rend; ++it) {
 996     Window* child = *it;
 997
 998     if (for_event_handling) {
 999       if (child->ignore_events_)
1000         continue;
1001       // The client may not allow events to be processed by certain subtrees.
1002       client::EventClient* client = client::GetEventClient(GetRootWindow());
1003       if (client && !client->CanProcessEventsWithinSubtree(child))
1004         continue;
1005       if (delegate_ && !delegate_->ShouldDescendIntoChildForEventHandling(
1006               child, local_point))
1007         continue;
1008     }
1009
1010     gfx::Point point_in_child_coords(local_point);
1011     ConvertPointToTarget(this, child, &point_in_child_coords);
1012     Window* match = child->GetWindowForPoint(point_in_child_coords,
1013                                              return_tightest,
1014                                              for_event_handling);
1015     if (match)
1016       return match;
1017   }
1018
1019   return delegate_ ? this : NULL;
1020 }
1021
1022 void Window::RemoveChildImpl(Window* child, Window* new_parent) {
1023   if (layout_manager_)
1024     layout_manager_->OnWillRemoveWindowFromLayout(child);
1025   FOR_EACH_OBSERVER(WindowObserver, observers_, OnWillRemoveWindow(child));
1026   Window* root_window = child->GetRootWindow();
1027   Window* new_root_window = new_parent ? new_parent->GetRootWindow() : NULL;
1028   if (root_window && root_window != new_root_window)
1029     child->NotifyRemovingFromRootWindow(new_root_window);
1030
1031   gfx::Vector2d offset;
1032   GetAncestorWithLayer(&offset);
1033   child->UnparentLayers(!layer(), offset);
1034   child->parent_ = NULL;
1035   Windows::iterator i = std::find(children_.begin(), children_.end(), child);
1036   DCHECK(i != children_.end());
1037   children_.erase(i);
1038   child->OnParentChanged();
1039   if (layout_manager_)
1040     layout_manager_->OnWindowRemovedFromLayout(child);
1041 }
1042
1043 void Window::UnparentLayers(bool has_layerless_ancestor,
1044                             const gfx::Vector2d& offset) {
1045   if (!layer()) {
1046     const gfx::Vector2d new_offset = offset + bounds().OffsetFromOrigin();
1047     for (size_t i = 0; i < children_.size(); ++i) {
1048       children_[i]->UnparentLayers(true, new_offset);
1049     }
1050   } else {
1051     // Only remove the layer if we still own it.  Someone else may have acquired
1052     // ownership of it via AcquireLayer() and may expect the hierarchy to go
1053     // unchanged as the Window is destroyed.
1054     if (OwnsLayer()) {
1055       if (layer()->parent())
1056         layer()->parent()->Remove(layer());
1057       if (has_layerless_ancestor) {
1058         const gfx::Rect real_bounds(bounds_);
1059         gfx::Rect layer_bounds(layer()->bounds());
1060         layer_bounds.Offset(-offset);
1061         layer()->SetBounds(layer_bounds);
1062         bounds_ = real_bounds;
1063       }
1064     }
1065   }
1066 }
1067
1068 void Window::ReparentLayers(ui::Layer* parent_layer,
1069                             const gfx::Vector2d& offset) {
1070   if (!layer()) {
1071     for (size_t i = 0; i < children_.size(); ++i) {
1072       children_[i]->ReparentLayers(
1073           parent_layer,
1074           offset + children_[i]->bounds().OffsetFromOrigin());
1075     }
1076   } else {
1077     const gfx::Rect real_bounds(bounds());
1078     parent_layer->Add(layer());
1079     gfx::Rect layer_bounds(layer()->bounds().size());
1080     layer_bounds += offset;
1081     layer()->SetBounds(layer_bounds);
1082     bounds_ = real_bounds;
1083   }
1084 }
1085
1086 void Window::OffsetLayerBounds(const gfx::Vector2d& offset) {
1087   if (!layer()) {
1088     for (size_t i = 0; i < children_.size(); ++i)
1089       children_[i]->OffsetLayerBounds(offset);
1090   } else {
1091     gfx::Rect layer_bounds(layer()->bounds());
1092     layer_bounds += offset;
1093     layer()->SetBounds(layer_bounds);
1094   }
1095 }
1096
1097 void Window::OnParentChanged() {
1098   FOR_EACH_OBSERVER(
1099       WindowObserver, observers_, OnWindowParentChanged(this, parent_));
1100 }
1101
1102 void Window::StackChildRelativeTo(Window* child,
1103                                   Window* target,
1104                                   StackDirection direction) {
1105   DCHECK_NE(child, target);
1106   DCHECK(child);
1107   DCHECK(target);
1108   DCHECK_EQ(this, child->parent());
1109   DCHECK_EQ(this, target->parent());
1110
1111   client::WindowStackingClient* stacking_client =
1112       client::GetWindowStackingClient();
1113   if (stacking_client &&
1114       !stacking_client->AdjustStacking(&child, &target, &direction))
1115     return;
1116
1117   const size_t child_i =
1118       std::find(children_.begin(), children_.end(), child) - children_.begin();
1119   const size_t target_i =
1120       std::find(children_.begin(), children_.end(), target) - children_.begin();
1121
1122   // Don't move the child if it is already in the right place.
1123   if ((direction == STACK_ABOVE && child_i == target_i + 1) ||
1124       (direction == STACK_BELOW && child_i + 1 == target_i))
1125     return;
1126
1127   const size_t dest_i =
1128       direction == STACK_ABOVE ?
1129       (child_i < target_i ? target_i : target_i + 1) :
1130       (child_i < target_i ? target_i - 1 : target_i);
1131   children_.erase(children_.begin() + child_i);
1132   children_.insert(children_.begin() + dest_i, child);
1133
1134   StackChildLayerRelativeTo(child, target, direction);
1135
1136   child->OnStackingChanged();
1137 }
1138
1139 void Window::StackChildLayerRelativeTo(Window* child,
1140                                        Window* target,
1141                                        StackDirection direction) {
1142   Window* ancestor_with_layer = GetAncestorWithLayer(NULL);
1143   ui::Layer* ancestor_layer =
1144       ancestor_with_layer ? ancestor_with_layer->layer() : NULL;
1145   if (!ancestor_layer)
1146     return;
1147
1148   if (child->layer() && target->layer()) {
1149     if (direction == STACK_ABOVE)
1150       ancestor_layer->StackAbove(child->layer(), target->layer());
1151     else
1152       ancestor_layer->StackBelow(child->layer(), target->layer());
1153     return;
1154   }
1155   typedef std::vector<ui::Layer*> Layers;
1156   Layers layers;
1157   GetLayersToStack(child, &layers);
1158   if (layers.empty())
1159     return;
1160
1161   ui::Layer* target_layer;
1162   if (direction == STACK_ABOVE) {
1163     target_layer =
1164         FindStackingTargetLayer<Windows::const_reverse_iterator>(target, child);
1165   } else {
1166     target_layer =
1167         FindStackingTargetLayer<Windows::const_iterator>(target, child);
1168   }
1169
1170   if (!target_layer) {
1171     if (direction == STACK_ABOVE) {
1172       for (Layers::const_reverse_iterator i = layers.rbegin(),
1173                rend = layers.rend(); i != rend; ++i) {
1174         ancestor_layer->StackAtBottom(*i);
1175       }
1176     } else {
1177       for (Layers::const_iterator i = layers.begin(); i != layers.end(); ++i)
1178         ancestor_layer->StackAtTop(*i);
1179     }
1180     return;
1181   }
1182
1183   if (direction == STACK_ABOVE) {
1184     for (Layers::const_reverse_iterator i = layers.rbegin(),
1185              rend = layers.rend(); i != rend; ++i) {
1186       ancestor_layer->StackAbove(*i, target_layer);
1187     }
1188   } else {
1189     for (Layers::const_iterator i = layers.begin(); i != layers.end(); ++i)
1190       ancestor_layer->StackBelow(*i, target_layer);
1191   }
1192 }
1193
1194 void Window::OnStackingChanged() {
1195   FOR_EACH_OBSERVER(WindowObserver, observers_, OnWindowStackingChanged(this));
1196 }
1197
1198 void Window::NotifyRemovingFromRootWindow(Window* new_root) {
1199   FOR_EACH_OBSERVER(WindowObserver, observers_,
1200                     OnWindowRemovingFromRootWindow(this, new_root));
1201   for (Window::Windows::const_iterator it = children_.begin();
1202        it != children_.end(); ++it) {
1203     (*it)->NotifyRemovingFromRootWindow(new_root);
1204   }
1205 }
1206
1207 void Window::NotifyAddedToRootWindow() {
1208   FOR_EACH_OBSERVER(WindowObserver, observers_,
1209                     OnWindowAddedToRootWindow(this));
1210   for (Window::Windows::const_iterator it = children_.begin();
1211        it != children_.end(); ++it) {
1212     (*it)->NotifyAddedToRootWindow();
1213   }
1214 }
1215
1216 void Window::NotifyWindowHierarchyChange(
1217     const WindowObserver::HierarchyChangeParams& params) {
1218   params.target->NotifyWindowHierarchyChangeDown(params);
1219   switch (params.phase) {
1220   case WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGING:
1221     if (params.old_parent)
1222       params.old_parent->NotifyWindowHierarchyChangeUp(params);
1223     break;
1224   case WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGED:
1225     if (params.new_parent)
1226       params.new_parent->NotifyWindowHierarchyChangeUp(params);
1227     break;
1228   default:
1229     NOTREACHED();
1230     break;
1231   }
1232 }
1233
1234 void Window::NotifyWindowHierarchyChangeDown(
1235     const WindowObserver::HierarchyChangeParams& params) {
1236   NotifyWindowHierarchyChangeAtReceiver(params);
1237   for (Window::Windows::const_iterator it = children_.begin();
1238        it != children_.end(); ++it) {
1239     (*it)->NotifyWindowHierarchyChangeDown(params);
1240   }
1241 }
1242
1243 void Window::NotifyWindowHierarchyChangeUp(
1244     const WindowObserver::HierarchyChangeParams& params) {
1245   for (Window* window = this; window; window = window->parent())
1246     window->NotifyWindowHierarchyChangeAtReceiver(params);
1247 }
1248
1249 void Window::NotifyWindowHierarchyChangeAtReceiver(
1250     const WindowObserver::HierarchyChangeParams& params) {
1251   WindowObserver::HierarchyChangeParams local_params = params;
1252   local_params.receiver = this;
1253
1254   switch (params.phase) {
1255   case WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGING:
1256     FOR_EACH_OBSERVER(WindowObserver, observers_,
1257                       OnWindowHierarchyChanging(local_params));
1258     break;
1259   case WindowObserver::HierarchyChangeParams::HIERARCHY_CHANGED:
1260     FOR_EACH_OBSERVER(WindowObserver, observers_,
1261                       OnWindowHierarchyChanged(local_params));
1262     break;
1263   default:
1264     NOTREACHED();
1265     break;
1266   }
1267 }
1268
1269 void Window::NotifyWindowVisibilityChanged(aura::Window* target,
1270                                            bool visible) {
1271   if (!NotifyWindowVisibilityChangedDown(target, visible)) {
1272     return; // |this| has been deleted.
1273   }
1274   NotifyWindowVisibilityChangedUp(target, visible);
1275 }
1276
1277 bool Window::NotifyWindowVisibilityChangedAtReceiver(aura::Window* target,
1278                                                      bool visible) {
1279   // |this| may be deleted during a call to OnWindowVisibilityChanged() on one
1280   // of the observers. We create an local observer for that. In that case we
1281   // exit without further access to any members.
1282   WindowTracker tracker;
1283   tracker.Add(this);
1284   FOR_EACH_OBSERVER(WindowObserver, observers_,
1285                     OnWindowVisibilityChanged(target, visible));
1286   return tracker.Contains(this);
1287 }
1288
1289 bool Window::NotifyWindowVisibilityChangedDown(aura::Window* target,
1290                                                bool visible) {
1291   if (!NotifyWindowVisibilityChangedAtReceiver(target, visible))
1292     return false; // |this| was deleted.
1293   std::set<const Window*> child_already_processed;
1294   bool child_destroyed = false;
1295   do {
1296     child_destroyed = false;
1297     for (Window::Windows::const_iterator it = children_.begin();
1298          it != children_.end(); ++it) {
1299       if (!child_already_processed.insert(*it).second)
1300         continue;
1301       if (!(*it)->NotifyWindowVisibilityChangedDown(target, visible)) {
1302         // |*it| was deleted, |it| is invalid and |children_| has changed.
1303         // We exit the current for-loop and enter a new one.
1304         child_destroyed = true;
1305         break;
1306       }
1307     }
1308   } while (child_destroyed);
1309   return true;
1310 }
1311
1312 void Window::NotifyWindowVisibilityChangedUp(aura::Window* target,
1313                                              bool visible) {
1314   for (Window* window = this; window; window = window->parent()) {
1315     bool ret = window->NotifyWindowVisibilityChangedAtReceiver(target, visible);
1316     DCHECK(ret);
1317   }
1318 }
1319
1320 void Window::OnWindowBoundsChanged(const gfx::Rect& old_bounds) {
1321   if (layer()) {
1322     bounds_ = layer()->bounds();
1323     if (parent_ && !parent_->layer()) {
1324       gfx::Vector2d offset;
1325       aura::Window* ancestor_with_layer =
1326           parent_->GetAncestorWithLayer(&offset);
1327       if (ancestor_with_layer)
1328         bounds_.Offset(-offset);
1329     }
1330   }
1331
1332   if (layout_manager_)
1333     layout_manager_->OnWindowResized();
1334   if (delegate_)
1335     delegate_->OnBoundsChanged(old_bounds, bounds());
1336   FOR_EACH_OBSERVER(WindowObserver,
1337                     observers_,
1338                     OnWindowBoundsChanged(this, old_bounds, bounds()));
1339 }
1340
1341 bool Window::CleanupGestureState() {
1342   bool state_modified = false;
1343   state_modified |= ui::GestureRecognizer::Get()->CancelActiveTouches(this);
1344   state_modified |=
1345       ui::GestureRecognizer::Get()->CleanupStateForConsumer(this);
1346   for (Window::Windows::iterator iter = children_.begin();
1347        iter != children_.end();
1348        ++iter) {
1349     state_modified |= (*iter)->CleanupGestureState();
1350   }
1351   return state_modified;
1352 }
1353
1354 void Window::OnPaintLayer(gfx::Canvas* canvas) {
1355   Paint(canvas);
1356 }
1357
1358 void Window::OnDelegatedFrameDamage(const gfx::Rect& damage_rect_in_dip) {
1359   DCHECK(layer());
1360   FOR_EACH_OBSERVER(WindowObserver,
1361                     observers_,
1362                     OnDelegatedFrameDamage(this, damage_rect_in_dip));
1363 }
1364
1365 base::Closure Window::PrepareForLayerBoundsChange() {
1366   return base::Bind(&Window::OnWindowBoundsChanged, base::Unretained(this),
1367                     bounds());
1368 }
1369
1370 bool Window::CanAcceptEvent(const ui::Event& event) {
1371   // The client may forbid certain windows from receiving events at a given
1372   // point in time.
1373   client::EventClient* client = client::GetEventClient(GetRootWindow());
1374   if (client && !client->CanProcessEventsWithinSubtree(this))
1375     return false;
1376
1377   // We need to make sure that a touch cancel event and any gesture events it
1378   // creates can always reach the window. This ensures that we receive a valid
1379   // touch / gesture stream.
1380   if (event.IsEndingEvent())
1381     return true;
1382
1383   if (!IsVisible())
1384     return false;
1385
1386   // The top-most window can always process an event.
1387   if (!parent_)
1388     return true;
1389
1390   // For located events (i.e. mouse, touch etc.), an assumption is made that
1391   // windows that don't have a default event-handler cannot process the event
1392   // (see more in GetWindowForPoint()). This assumption is not made for key
1393   // events.
1394   return event.IsKeyEvent() || target_handler();
1395 }
1396
1397 ui::EventTarget* Window::GetParentTarget() {
1398   if (IsRootWindow()) {
1399     return client::GetEventClient(this) ?
1400         client::GetEventClient(this)->GetToplevelEventTarget() :
1401             Env::GetInstance();
1402   }
1403   return parent_;
1404 }
1405
1406 scoped_ptr<ui::EventTargetIterator> Window::GetChildIterator() const {
1407   return scoped_ptr<ui::EventTargetIterator>(
1408       new ui::EventTargetIteratorImpl<Window>(children()));
1409 }
1410
1411 ui::EventTargeter* Window::GetEventTargeter() {
1412   return targeter_.get();
1413 }
1414
1415 void Window::ConvertEventToTarget(ui::EventTarget* target,
1416                                   ui::LocatedEvent* event) {
1417   event->ConvertLocationToTarget(this,
1418                                  static_cast<Window*>(target));
1419 }
1420
1421 void Window::UpdateLayerName() {
1422 #if !defined(NDEBUG)
1423   DCHECK(layer());
1424
1425   std::string layer_name(name_);
1426   if (layer_name.empty())
1427     layer_name = "Unnamed Window";
1428
1429   if (id_ != -1)
1430     layer_name += " " + base::IntToString(id_);
1431
1432   layer()->set_name(layer_name);
1433 #endif
1434 }
1435
1436 bool Window::ContainsMouse() {
1437   bool contains_mouse = false;
1438   if (IsVisible()) {
1439     WindowTreeHost* host = GetHost();
1440     contains_mouse = host &&
1441         ContainsPointInRoot(host->dispatcher()->GetLastMouseLocationInRoot());
1442   }
1443   return contains_mouse;
1444 }
1445
1446 const Window* Window::GetAncestorWithLayer(gfx::Vector2d* offset) const {
1447   for (const aura::Window* window = this; window; window = window->parent()) {
1448     if (window->layer())
1449       return window;
1450     if (offset)
1451       *offset += window->bounds().OffsetFromOrigin();
1452   }
1453   if (offset)
1454     *offset = gfx::Vector2d();
1455   return NULL;
1456 }
1457
1458 }  // namespace aura