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