ui/aura/root_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/root_window.h"
   6
   7 #include <vector>
   8
   9 #include "base/bind.h"
  10 #include "base/command_line.h"
  11 #include "base/debug/trace_event.h"
  12 #include "base/logging.h"
  13 #include "base/message_loop/message_loop.h"
  14 #include "ui/aura/client/capture_client.h"
  15 #include "ui/aura/client/cursor_client.h"
  16 #include "ui/aura/client/event_client.h"
  17 #include "ui/aura/client/focus_client.h"
  18 #include "ui/aura/client/screen_position_client.h"
  19 #include "ui/aura/env.h"
  20 #include "ui/aura/root_window_observer.h"
  21 #include "ui/aura/window.h"
  22 #include "ui/aura/window_delegate.h"
  23 #include "ui/aura/window_targeter.h"
  24 #include "ui/aura/window_tracker.h"
  25 #include "ui/aura/window_tree_host.h"
  26 #include "ui/base/hit_test.h"
  27 #include "ui/base/view_prop.h"
  28 #include "ui/compositor/dip_util.h"
  29 #include "ui/compositor/layer.h"
  30 #include "ui/compositor/layer_animator.h"
  31 #include "ui/events/event.h"
  32 #include "ui/events/gestures/gesture_recognizer.h"
  33 #include "ui/events/gestures/gesture_types.h"
  34 #include "ui/gfx/screen.h"
  35
  36 using std::vector;
  37
  38 typedef ui::EventDispatchDetails DispatchDetails;
  39
  40 namespace aura {
  41
  42 namespace {
  43
  44 const char kRootWindowForAcceleratedWidget[] =
  45     "__AURA_ROOT_WINDOW_ACCELERATED_WIDGET__";
  46
  47 // Returns true if |target| has a non-client (frame) component at |location|,
  48 // in window coordinates.
  49 bool IsNonClientLocation(Window* target, const gfx::Point& location) {
  50   if (!target->delegate())
  51     return false;
  52   int hit_test_code = target->delegate()->GetNonClientComponent(location);
  53   return hit_test_code != HTCLIENT && hit_test_code != HTNOWHERE;
  54 }
  55
  56 Window* ConsumerToWindow(ui::GestureConsumer* consumer) {
  57   return consumer ? static_cast<Window*>(consumer) : NULL;
  58 }
  59
  60 void SetLastMouseLocation(const Window* root_window,
  61                           const gfx::Point& location_in_root) {
  62   client::ScreenPositionClient* client =
  63       client::GetScreenPositionClient(root_window);
  64   if (client) {
  65     gfx::Point location_in_screen = location_in_root;
  66     client->ConvertPointToScreen(root_window, &location_in_screen);
  67     Env::GetInstance()->set_last_mouse_location(location_in_screen);
  68   } else {
  69     Env::GetInstance()->set_last_mouse_location(location_in_root);
  70   }
  71 }
  72
  73 WindowTreeHost* CreateHost(RootWindow* root_window,
  74                            const RootWindow::CreateParams& params) {
  75   WindowTreeHost* host = params.host ?
  76       params.host : WindowTreeHost::Create(params.initial_bounds);
  77   host->set_delegate(root_window);
  78   return host;
  79 }
  80
  81 bool IsEventCandidateForHold(const ui::Event& event) {
  82   if (event.type() == ui::ET_TOUCH_MOVED)
  83     return true;
  84   if (event.type() == ui::ET_MOUSE_DRAGGED)
  85     return true;
  86   if (event.IsMouseEvent() && (event.flags() & ui::EF_IS_SYNTHESIZED))
  87     return true;
  88   return false;
  89 }
  90
  91 }  // namespace
  92
  93 RootWindow::CreateParams::CreateParams(const gfx::Rect& a_initial_bounds)
  94     : initial_bounds(a_initial_bounds),
  95       host(NULL) {
  96 }
  97
  98 ////////////////////////////////////////////////////////////////////////////////
  99 // RootWindow, public:
 100
 101 RootWindow::RootWindow(const CreateParams& params)
 102     : window_(new Window(NULL)),
 103       host_(CreateHost(this, params)),
 104       touch_ids_down_(0),
 105       mouse_pressed_handler_(NULL),
 106       mouse_moved_handler_(NULL),
 107       event_dispatch_target_(NULL),
 108       old_dispatch_target_(NULL),
 109       synthesize_mouse_move_(false),
 110       move_hold_count_(0),
 111       dispatching_held_event_(false),
 112       repost_event_factory_(this),
 113       held_event_factory_(this) {
 114   window()->set_dispatcher(this);
 115   window()->SetName("RootWindow");
 116   window()->SetEventTargeter(
 117       scoped_ptr<ui::EventTargeter>(new WindowTargeter()));
 118
 119   prop_.reset(new ui::ViewProp(host_->GetAcceleratedWidget(),
 120                                kRootWindowForAcceleratedWidget,
 121                                this));
 122   ui::GestureRecognizer::Get()->AddGestureEventHelper(this);
 123 }
 124
 125 RootWindow::~RootWindow() {
 126   TRACE_EVENT0("shutdown", "RootWindow::Destructor");
 127
 128   ui::GestureRecognizer::Get()->RemoveGestureEventHelper(this);
 129
 130   // An observer may have been added by an animation on the RootWindow.
 131   window()->layer()->GetAnimator()->RemoveObserver(this);
 132
 133   // Destroy child windows while we're still valid. This is also done by
 134   // ~Window, but by that time any calls to virtual methods overriden here (such
 135   // as GetRootWindow()) result in Window's implementation. By destroying here
 136   // we ensure GetRootWindow() still returns this.
 137   window()->RemoveOrDestroyChildren();
 138
 139   // Destroying/removing child windows may try to access |host_| (eg.
 140   // GetAcceleratedWidget())
 141   host_.reset(NULL);
 142
 143   window()->set_dispatcher(NULL);
 144 }
 145
 146 // static
 147 RootWindow* RootWindow::GetForAcceleratedWidget(
 148     gfx::AcceleratedWidget widget) {
 149   return reinterpret_cast<RootWindow*>(
 150       ui::ViewProp::GetValue(widget, kRootWindowForAcceleratedWidget));
 151 }
 152
 153 void RootWindow::PrepareForShutdown() {
 154   host_->PrepareForShutdown();
 155   // discard synthesize event request as well.
 156   synthesize_mouse_move_ = false;
 157 }
 158
 159 void RootWindow::RepostEvent(const ui::LocatedEvent& event) {
 160   DCHECK(event.type() == ui::ET_MOUSE_PRESSED ||
 161          event.type() == ui::ET_GESTURE_TAP_DOWN);
 162   // We allow for only one outstanding repostable event. This is used
 163   // in exiting context menus.  A dropped repost request is allowed.
 164   if (event.type() == ui::ET_MOUSE_PRESSED) {
 165     held_repostable_event_.reset(
 166         new ui::MouseEvent(
 167             static_cast<const ui::MouseEvent&>(event),
 168             static_cast<aura::Window*>(event.target()),
 169             window()));
 170     base::MessageLoop::current()->PostNonNestableTask(
 171         FROM_HERE,
 172         base::Bind(base::IgnoreResult(&RootWindow::DispatchHeldEvents),
 173                    repost_event_factory_.GetWeakPtr()));
 174   } else {
 175     DCHECK(event.type() == ui::ET_GESTURE_TAP_DOWN);
 176     held_repostable_event_.reset();
 177     // TODO(rbyers): Reposing of gestures is tricky to get
 178     // right, so it's not yet supported.  crbug.com/170987.
 179   }
 180 }
 181
 182 WindowTreeHostDelegate* RootWindow::AsWindowTreeHostDelegate() {
 183   return this;
 184 }
 185
 186 void RootWindow::OnMouseEventsEnableStateChanged(bool enabled) {
 187   // Send entered / exited so that visual state can be updated to match
 188   // mouse events state.
 189   PostMouseMoveEventAfterWindowChange();
 190   // TODO(mazda): Add code to disable mouse events when |enabled| == false.
 191 }
 192
 193 Window* RootWindow::GetGestureTarget(ui::GestureEvent* event) {
 194   Window* target = NULL;
 195   if (!event->IsEndingEvent()) {
 196     // The window that received the start event (e.g. scroll begin) needs to
 197     // receive the end event (e.g. scroll end).
 198     target = client::GetCaptureWindow(window());
 199   }
 200   if (!target) {
 201     target = ConsumerToWindow(
 202         ui::GestureRecognizer::Get()->GetTargetForGestureEvent(*event));
 203   }
 204
 205   return target;
 206 }
 207
 208 void RootWindow::DispatchGestureEvent(ui::GestureEvent* event) {
 209   DispatchDetails details = DispatchHeldEvents();
 210   if (details.dispatcher_destroyed)
 211     return;
 212
 213   Window* target = GetGestureTarget(event);
 214   if (target) {
 215     event->ConvertLocationToTarget(window(), target);
 216     DispatchDetails details = DispatchEvent(target, event);
 217     if (details.dispatcher_destroyed)
 218       return;
 219   }
 220 }
 221
 222 void RootWindow::OnWindowDestroying(Window* window) {
 223   DispatchMouseExitToHidingWindow(window);
 224   if (window->IsVisible() &&
 225       window->ContainsPointInRoot(GetLastMouseLocationInRoot())) {
 226     PostMouseMoveEventAfterWindowChange();
 227   }
 228
 229   // Hiding the window releases capture which can implicitly destroy the window
 230   // so the window may no longer be valid after this call.
 231   OnWindowHidden(window, WINDOW_DESTROYED);
 232 }
 233
 234 void RootWindow::OnWindowBoundsChanged(Window* window,
 235                                        bool contained_mouse_point) {
 236   if (contained_mouse_point ||
 237       (window->IsVisible() &&
 238        window->ContainsPointInRoot(GetLastMouseLocationInRoot()))) {
 239     PostMouseMoveEventAfterWindowChange();
 240   }
 241 }
 242
 243 void RootWindow::DispatchMouseExitToHidingWindow(Window* window) {
 244   // The mouse capture is intentionally ignored. Think that a mouse enters
 245   // to a window, the window sets the capture, the mouse exits the window,
 246   // and then it releases the capture. In that case OnMouseExited won't
 247   // be called. So it is natural not to emit OnMouseExited even though
 248   // |window| is the capture window.
 249   gfx::Point last_mouse_location = GetLastMouseLocationInRoot();
 250   if (window->Contains(mouse_moved_handler_) &&
 251       window->ContainsPointInRoot(last_mouse_location))
 252     DispatchMouseExitAtPoint(last_mouse_location);
 253 }
 254
 255 void RootWindow::DispatchMouseExitAtPoint(const gfx::Point& point) {
 256   ui::MouseEvent event(ui::ET_MOUSE_EXITED, point, point, ui::EF_NONE,
 257                        ui::EF_NONE);
 258   DispatchDetails details =
 259       DispatchMouseEnterOrExit(event, ui::ET_MOUSE_EXITED);
 260   if (details.dispatcher_destroyed)
 261     return;
 262 }
 263
 264 void RootWindow::OnWindowVisibilityChanged(Window* window, bool is_visible) {
 265   if (window->ContainsPointInRoot(GetLastMouseLocationInRoot()))
 266     PostMouseMoveEventAfterWindowChange();
 267
 268   // Hiding the window releases capture which can implicitly destroy the window
 269   // so the window may no longer be valid after this call.
 270   if (!is_visible)
 271     OnWindowHidden(window, WINDOW_HIDDEN);
 272 }
 273
 274 void RootWindow::OnWindowTransformed(Window* window, bool contained_mouse) {
 275   if (contained_mouse ||
 276       (window->IsVisible() &&
 277        window->ContainsPointInRoot(GetLastMouseLocationInRoot()))) {
 278     PostMouseMoveEventAfterWindowChange();
 279   }
 280 }
 281
 282 void RootWindow::OnKeyboardMappingChanged() {
 283   FOR_EACH_OBSERVER(RootWindowObserver, observers_,
 284                     OnKeyboardMappingChanged(this));
 285 }
 286
 287 void RootWindow::OnWindowTreeHostCloseRequested() {
 288   FOR_EACH_OBSERVER(RootWindowObserver, observers_,
 289                     OnWindowTreeHostCloseRequested(this));
 290 }
 291
 292 void RootWindow::AddRootWindowObserver(RootWindowObserver* observer) {
 293   observers_.AddObserver(observer);
 294 }
 295
 296 void RootWindow::RemoveRootWindowObserver(RootWindowObserver* observer) {
 297   observers_.RemoveObserver(observer);
 298 }
 299
 300 void RootWindow::ProcessedTouchEvent(ui::TouchEvent* event,
 301                                      Window* window,
 302                                      ui::EventResult result) {
 303   scoped_ptr<ui::GestureRecognizer::Gestures> gestures;
 304   gestures.reset(ui::GestureRecognizer::Get()->
 305       ProcessTouchEventForGesture(*event, result, window));
 306   DispatchDetails details = ProcessGestures(gestures.get());
 307   if (details.dispatcher_destroyed)
 308     return;
 309 }
 310
 311 void RootWindow::HoldPointerMoves() {
 312   if (!move_hold_count_)
 313     held_event_factory_.InvalidateWeakPtrs();
 314   ++move_hold_count_;
 315   TRACE_EVENT_ASYNC_BEGIN0("ui", "RootWindow::HoldPointerMoves", this);
 316 }
 317
 318 void RootWindow::ReleasePointerMoves() {
 319   --move_hold_count_;
 320   DCHECK_GE(move_hold_count_, 0);
 321   if (!move_hold_count_ && held_move_event_) {
 322     // We don't want to call DispatchHeldEvents directly, because this might be
 323     // called from a deep stack while another event, in which case dispatching
 324     // another one may not be safe/expected.  Instead we post a task, that we
 325     // may cancel if HoldPointerMoves is called again before it executes.
 326     base::MessageLoop::current()->PostNonNestableTask(
 327         FROM_HERE,
 328         base::Bind(base::IgnoreResult(&RootWindow::DispatchHeldEvents),
 329                    held_event_factory_.GetWeakPtr()));
 330   }
 331   TRACE_EVENT_ASYNC_END0("ui", "RootWindow::HoldPointerMoves", this);
 332 }
 333
 334 gfx::Point RootWindow::GetLastMouseLocationInRoot() const {
 335   gfx::Point location = Env::GetInstance()->last_mouse_location();
 336   client::ScreenPositionClient* client =
 337       client::GetScreenPositionClient(window());
 338   if (client)
 339     client->ConvertPointFromScreen(window(), &location);
 340   return location;
 341 }
 342
 343 ////////////////////////////////////////////////////////////////////////////////
 344 // RootWindow, private:
 345
 346 void RootWindow::TransformEventForDeviceScaleFactor(ui::LocatedEvent* event) {
 347   event->UpdateForRootTransform(host()->GetInverseRootTransform());
 348 }
 349
 350 ui::EventDispatchDetails RootWindow::DispatchMouseEnterOrExit(
 351     const ui::MouseEvent& event,
 352     ui::EventType type) {
 353   if (event.type() != ui::ET_MOUSE_CAPTURE_CHANGED &&
 354       !(event.flags() & ui::EF_IS_SYNTHESIZED)) {
 355     SetLastMouseLocation(window(), event.root_location());
 356   }
 357
 358   if (!mouse_moved_handler_ || !mouse_moved_handler_->delegate())
 359     return DispatchDetails();
 360
 361   // |event| may be an event in the process of being dispatched to a target (in
 362   // which case its locations will be in the event's target's coordinate
 363   // system), or a synthetic event created in root-window (in which case, the
 364   // event's target will be NULL, and the event will be in the root-window's
 365   // coordinate system.
 366   aura::Window* target = static_cast<Window*>(event.target());
 367   if (!target)
 368     target = window();
 369   ui::MouseEvent translated_event(event,
 370                                   target,
 371                                   mouse_moved_handler_,
 372                                   type,
 373                                   event.flags() | ui::EF_IS_SYNTHESIZED);
 374   return DispatchEvent(mouse_moved_handler_, &translated_event);
 375 }
 376
 377 ui::EventDispatchDetails RootWindow::ProcessGestures(
 378     ui::GestureRecognizer::Gestures* gestures) {
 379   DispatchDetails details;
 380   if (!gestures || gestures->empty())
 381     return details;
 382
 383   Window* target = GetGestureTarget(gestures->get().at(0));
 384   for (size_t i = 0; i < gestures->size(); ++i) {
 385     ui::GestureEvent* event = gestures->get().at(i);
 386     event->ConvertLocationToTarget(window(), target);
 387     details = DispatchEvent(target, event);
 388     if (details.dispatcher_destroyed || details.target_destroyed)
 389       break;
 390   }
 391   return details;
 392 }
 393
 394 void RootWindow::OnWindowAddedToRootWindow(Window* attached) {
 395   if (attached->IsVisible() &&
 396       attached->ContainsPointInRoot(GetLastMouseLocationInRoot())) {
 397     PostMouseMoveEventAfterWindowChange();
 398   }
 399 }
 400
 401 void RootWindow::OnWindowRemovedFromRootWindow(Window* detached,
 402                                                Window* new_root) {
 403   DCHECK(aura::client::GetCaptureWindow(window()) != window());
 404
 405   DispatchMouseExitToHidingWindow(detached);
 406   if (detached->IsVisible() &&
 407       detached->ContainsPointInRoot(GetLastMouseLocationInRoot())) {
 408     PostMouseMoveEventAfterWindowChange();
 409   }
 410
 411   // Hiding the window releases capture which can implicitly destroy the window
 412   // so the window may no longer be valid after this call.
 413   OnWindowHidden(detached, new_root ? WINDOW_MOVING : WINDOW_HIDDEN);
 414 }
 415
 416 void RootWindow::OnWindowHidden(Window* invisible, WindowHiddenReason reason) {
 417   // If the window the mouse was pressed in becomes invisible, it should no
 418   // longer receive mouse events.
 419   if (invisible->Contains(mouse_pressed_handler_))
 420     mouse_pressed_handler_ = NULL;
 421   if (invisible->Contains(mouse_moved_handler_))
 422     mouse_moved_handler_ = NULL;
 423
 424   CleanupGestureState(invisible);
 425
 426   // Do not clear the capture, and the |event_dispatch_target_| if the
 427   // window is moving across root windows, because the target itself
 428   // is actually still visible and clearing them stops further event
 429   // processing, which can cause unexpected behaviors. See
 430   // crbug.com/157583
 431   if (reason != WINDOW_MOVING) {
 432     Window* capture_window = aura::client::GetCaptureWindow(window());
 433
 434     if (invisible->Contains(event_dispatch_target_))
 435       event_dispatch_target_ = NULL;
 436
 437     if (invisible->Contains(old_dispatch_target_))
 438       old_dispatch_target_ = NULL;
 439
 440     // If the ancestor of the capture window is hidden, release the capture.
 441     // Note that this may delete the window so do not use capture_window
 442     // after this.
 443     if (invisible->Contains(capture_window) && invisible != window())
 444       capture_window->ReleaseCapture();
 445   }
 446 }
 447
 448 void RootWindow::CleanupGestureState(Window* window) {
 449   ui::GestureRecognizer::Get()->CancelActiveTouches(window);
 450   ui::GestureRecognizer::Get()->CleanupStateForConsumer(window);
 451   const Window::Windows& windows = window->children();
 452   for (Window::Windows::const_iterator iter = windows.begin();
 453       iter != windows.end();
 454       ++iter) {
 455     CleanupGestureState(*iter);
 456   }
 457 }
 458
 459 ////////////////////////////////////////////////////////////////////////////////
 460 // RootWindow, aura::client::CaptureDelegate implementation:
 461
 462 void RootWindow::UpdateCapture(Window* old_capture,
 463                                Window* new_capture) {
 464   // |mouse_moved_handler_| may have been set to a Window in a different root
 465   // (see below). Clear it here to ensure we don't end up referencing a stale
 466   // Window.
 467   if (mouse_moved_handler_ && !window()->Contains(mouse_moved_handler_))
 468     mouse_moved_handler_ = NULL;
 469
 470   if (old_capture && old_capture->GetRootWindow() == window() &&
 471       old_capture->delegate()) {
 472     // Send a capture changed event with bogus location data.
 473     ui::MouseEvent event(ui::ET_MOUSE_CAPTURE_CHANGED, gfx::Point(),
 474                          gfx::Point(), 0, 0);
 475
 476     DispatchDetails details = DispatchEvent(old_capture, &event);
 477     if (details.dispatcher_destroyed)
 478       return;
 479
 480     old_capture->delegate()->OnCaptureLost();
 481   }
 482
 483   if (new_capture) {
 484     // Make all subsequent mouse events go to the capture window. We shouldn't
 485     // need to send an event here as OnCaptureLost() should take care of that.
 486     if (mouse_moved_handler_ || Env::GetInstance()->IsMouseButtonDown())
 487       mouse_moved_handler_ = new_capture;
 488   } else {
 489     // Make sure mouse_moved_handler gets updated.
 490     DispatchDetails details = SynthesizeMouseMoveEvent();
 491     if (details.dispatcher_destroyed)
 492       return;
 493   }
 494   mouse_pressed_handler_ = NULL;
 495 }
 496
 497 void RootWindow::OnOtherRootGotCapture() {
 498   mouse_moved_handler_ = NULL;
 499   mouse_pressed_handler_ = NULL;
 500 }
 501
 502 void RootWindow::SetNativeCapture() {
 503   host_->SetCapture();
 504 }
 505
 506 void RootWindow::ReleaseNativeCapture() {
 507   host_->ReleaseCapture();
 508 }
 509
 510 ////////////////////////////////////////////////////////////////////////////////
 511 // RootWindow, ui::EventProcessor implementation:
 512 ui::EventTarget* RootWindow::GetRootTarget() {
 513   return window();
 514 }
 515
 516 void RootWindow::PrepareEventForDispatch(ui::Event* event) {
 517   if (dispatching_held_event_) {
 518     // The held events are already in |window()|'s coordinate system. So it is
 519     // not necessary to apply the transform to convert from the host's
 520     // coordinate system to |window()|'s coordinate system.
 521     return;
 522   }
 523   if (event->IsMouseEvent() ||
 524       event->IsScrollEvent() ||
 525       event->IsTouchEvent() ||
 526       event->IsGestureEvent()) {
 527     TransformEventForDeviceScaleFactor(static_cast<ui::LocatedEvent*>(event));
 528   }
 529 }
 530
 531 ////////////////////////////////////////////////////////////////////////////////
 532 // RootWindow, ui::EventDispatcherDelegate implementation:
 533
 534 bool RootWindow::CanDispatchToTarget(ui::EventTarget* target) {
 535   return event_dispatch_target_ == target;
 536 }
 537
 538 ui::EventDispatchDetails RootWindow::PreDispatchEvent(ui::EventTarget* target,
 539                                                       ui::Event* event) {
 540   if (!dispatching_held_event_) {
 541     bool can_be_held = IsEventCandidateForHold(*event);
 542     if (!move_hold_count_ || !can_be_held) {
 543       if (can_be_held)
 544         held_move_event_.reset();
 545       DispatchDetails details = DispatchHeldEvents();
 546       if (details.dispatcher_destroyed || details.target_destroyed)
 547         return details;
 548     }
 549   }
 550
 551   Window* target_window = static_cast<Window*>(target);
 552   if (event->IsMouseEvent()) {
 553     PreDispatchMouseEvent(target_window, static_cast<ui::MouseEvent*>(event));
 554   } else if (event->IsScrollEvent()) {
 555     PreDispatchLocatedEvent(target_window,
 556                             static_cast<ui::ScrollEvent*>(event));
 557   } else if (event->IsTouchEvent()) {
 558     PreDispatchTouchEvent(target_window, static_cast<ui::TouchEvent*>(event));
 559   }
 560   old_dispatch_target_ = event_dispatch_target_;
 561   event_dispatch_target_ = static_cast<Window*>(target);
 562   return DispatchDetails();
 563 }
 564
 565 ui::EventDispatchDetails RootWindow::PostDispatchEvent(ui::EventTarget* target,
 566                                                        const ui::Event& event) {
 567   DispatchDetails details;
 568   if (target != event_dispatch_target_)
 569     details.target_destroyed = true;
 570   event_dispatch_target_ = old_dispatch_target_;
 571   old_dispatch_target_ = NULL;
 572 #ifndef NDEBUG
 573   DCHECK(!event_dispatch_target_ || window()->Contains(event_dispatch_target_));
 574 #endif
 575
 576   if (event.IsTouchEvent() && !details.target_destroyed) {
 577     // Do not let 'held' touch events contribute to any gestures.
 578     if (!held_move_event_ || !held_move_event_->IsTouchEvent()) {
 579       ui::TouchEvent orig_event(static_cast<const ui::TouchEvent&>(event),
 580                                 static_cast<Window*>(event.target()), window());
 581       // Get the list of GestureEvents from GestureRecognizer.
 582       scoped_ptr<ui::GestureRecognizer::Gestures> gestures;
 583       gestures.reset(ui::GestureRecognizer::Get()->
 584           ProcessTouchEventForGesture(orig_event, event.result(),
 585                                       static_cast<Window*>(target)));
 586       return ProcessGestures(gestures.get());
 587     }
 588   }
 589
 590   return details;
 591 }
 592
 593 ////////////////////////////////////////////////////////////////////////////////
 594 // RootWindow, ui::GestureEventHelper implementation:
 595
 596 bool RootWindow::CanDispatchToConsumer(ui::GestureConsumer* consumer) {
 597   Window* consumer_window = ConsumerToWindow(consumer);;
 598   return (consumer_window && consumer_window->GetRootWindow() == window());
 599 }
 600
 601 void RootWindow::DispatchPostponedGestureEvent(ui::GestureEvent* event) {
 602   DispatchGestureEvent(event);
 603 }
 604
 605 void RootWindow::DispatchCancelTouchEvent(ui::TouchEvent* event) {
 606   DispatchDetails details = OnEventFromSource(event);
 607   if (details.dispatcher_destroyed)
 608     return;
 609 }
 610
 611 ////////////////////////////////////////////////////////////////////////////////
 612 // RootWindow, ui::LayerAnimationObserver implementation:
 613
 614 void RootWindow::OnLayerAnimationEnded(
 615     ui::LayerAnimationSequence* animation) {
 616   host()->UpdateRootWindowSize(host_->GetBounds().size());
 617 }
 618
 619 void RootWindow::OnLayerAnimationScheduled(
 620     ui::LayerAnimationSequence* animation) {
 621 }
 622
 623 void RootWindow::OnLayerAnimationAborted(
 624     ui::LayerAnimationSequence* animation) {
 625 }
 626
 627 ////////////////////////////////////////////////////////////////////////////////
 628 // RootWindow, WindowTreeHostDelegate implementation:
 629
 630 void RootWindow::OnHostCancelMode() {
 631   ui::CancelModeEvent event;
 632   Window* focused_window = client::GetFocusClient(window())->GetFocusedWindow();
 633   DispatchDetails details =
 634       DispatchEvent(focused_window ? focused_window : window(), &event);
 635   if (details.dispatcher_destroyed)
 636     return;
 637 }
 638
 639 void RootWindow::OnHostActivated() {
 640   Env::GetInstance()->RootWindowActivated(this);
 641 }
 642
 643 void RootWindow::OnHostLostWindowCapture() {
 644   Window* capture_window = client::GetCaptureWindow(window());
 645   if (capture_window && capture_window->GetRootWindow() == window())
 646     capture_window->ReleaseCapture();
 647 }
 648
 649 void RootWindow::OnHostLostMouseGrab() {
 650   mouse_pressed_handler_ = NULL;
 651   mouse_moved_handler_ = NULL;
 652 }
 653
 654 void RootWindow::OnHostMoved(const gfx::Point& origin) {
 655   TRACE_EVENT1("ui", "RootWindow::OnHostMoved",
 656                "origin", origin.ToString());
 657
 658   FOR_EACH_OBSERVER(RootWindowObserver, observers_,
 659                     OnWindowTreeHostMoved(this, origin));
 660 }
 661
 662 void RootWindow::OnHostResized(const gfx::Size& size) {
 663   TRACE_EVENT1("ui", "RootWindow::OnHostResized",
 664                "size", size.ToString());
 665
 666   DispatchDetails details = DispatchHeldEvents();
 667   if (details.dispatcher_destroyed)
 668     return;
 669   FOR_EACH_OBSERVER(RootWindowObserver, observers_,
 670                     OnWindowTreeHostResized(this));
 671
 672   // Constrain the mouse position within the new root Window size.
 673   gfx::Point point;
 674   if (host_->QueryMouseLocation(&point)) {
 675     SetLastMouseLocation(window(),
 676                          ui::ConvertPointToDIP(window()->layer(), point));
 677   }
 678   synthesize_mouse_move_ = false;
 679 }
 680
 681 void RootWindow::OnCursorMovedToRootLocation(const gfx::Point& root_location) {
 682   SetLastMouseLocation(window(), root_location);
 683   synthesize_mouse_move_ = false;
 684 }
 685
 686 RootWindow* RootWindow::AsRootWindow() {
 687   return this;
 688 }
 689
 690 const RootWindow* RootWindow::AsRootWindow() const {
 691   return this;
 692 }
 693
 694 ui::EventProcessor* RootWindow::GetEventProcessor() {
 695   return this;
 696 }
 697
 698 ////////////////////////////////////////////////////////////////////////////////
 699 // RootWindow, private:
 700
 701 ui::EventDispatchDetails RootWindow::DispatchHeldEvents() {
 702   if (!held_repostable_event_ && !held_move_event_)
 703     return DispatchDetails();
 704
 705   CHECK(!dispatching_held_event_);
 706   dispatching_held_event_ = true;
 707
 708   DispatchDetails dispatch_details;
 709   if (held_repostable_event_) {
 710     if (held_repostable_event_->type() == ui::ET_MOUSE_PRESSED) {
 711       scoped_ptr<ui::MouseEvent> mouse_event(
 712           static_cast<ui::MouseEvent*>(held_repostable_event_.release()));
 713       dispatch_details = OnEventFromSource(mouse_event.get());
 714     } else {
 715       // TODO(rbyers): GESTURE_TAP_DOWN not yet supported: crbug.com/170987.
 716       NOTREACHED();
 717     }
 718     if (dispatch_details.dispatcher_destroyed)
 719       return dispatch_details;
 720   }
 721
 722   if (held_move_event_) {
 723     // If a mouse move has been synthesized, the target location is suspect,
 724     // so drop the held mouse event.
 725     if (held_move_event_->IsTouchEvent() ||
 726         (held_move_event_->IsMouseEvent() && !synthesize_mouse_move_)) {
 727       dispatch_details = OnEventFromSource(held_move_event_.get());
 728     }
 729     if (!dispatch_details.dispatcher_destroyed)
 730       held_move_event_.reset();
 731   }
 732
 733   if (!dispatch_details.dispatcher_destroyed)
 734     dispatching_held_event_ = false;
 735   return dispatch_details;
 736 }
 737
 738 void RootWindow::PostMouseMoveEventAfterWindowChange() {
 739   if (synthesize_mouse_move_)
 740     return;
 741   synthesize_mouse_move_ = true;
 742   base::MessageLoop::current()->PostNonNestableTask(
 743       FROM_HERE,
 744       base::Bind(base::IgnoreResult(&RootWindow::SynthesizeMouseMoveEvent),
 745                  held_event_factory_.GetWeakPtr()));
 746 }
 747
 748 ui::EventDispatchDetails RootWindow::SynthesizeMouseMoveEvent() {
 749   DispatchDetails details;
 750   if (!synthesize_mouse_move_)
 751     return details;
 752   synthesize_mouse_move_ = false;
 753   gfx::Point root_mouse_location = GetLastMouseLocationInRoot();
 754   if (!window()->bounds().Contains(root_mouse_location))
 755     return details;
 756   gfx::Point host_mouse_location = root_mouse_location;
 757   host()->ConvertPointToHost(&host_mouse_location);
 758   ui::MouseEvent event(ui::ET_MOUSE_MOVED,
 759                        host_mouse_location,
 760                        host_mouse_location,
 761                        ui::EF_IS_SYNTHESIZED,
 762                        0);
 763   return OnEventFromSource(&event);
 764 }
 765
 766 void RootWindow::PreDispatchLocatedEvent(Window* target,
 767                                          ui::LocatedEvent* event) {
 768   int flags = event->flags();
 769   if (IsNonClientLocation(target, event->location()))
 770     flags |= ui::EF_IS_NON_CLIENT;
 771   event->set_flags(flags);
 772
 773   if (!dispatching_held_event_ &&
 774       (event->IsMouseEvent() || event->IsScrollEvent()) &&
 775       !(event->flags() & ui::EF_IS_SYNTHESIZED)) {
 776     if (event->type() != ui::ET_MOUSE_CAPTURE_CHANGED)
 777       SetLastMouseLocation(window(), event->root_location());
 778     synthesize_mouse_move_ = false;
 779   }
 780 }
 781
 782 void RootWindow::PreDispatchMouseEvent(Window* target,
 783                                        ui::MouseEvent* event) {
 784   client::CursorClient* cursor_client = client::GetCursorClient(window());
 785   if (cursor_client &&
 786       !cursor_client->IsMouseEventsEnabled() &&
 787       (event->flags() & ui::EF_IS_SYNTHESIZED)) {
 788     event->SetHandled();
 789     return;
 790   }
 791
 792   if (IsEventCandidateForHold(*event) && !dispatching_held_event_) {
 793     if (move_hold_count_) {
 794       held_move_event_.reset(new ui::MouseEvent(*event, target, window()));
 795       event->SetHandled();
 796       return;
 797     } else {
 798       // We may have a held event for a period between the time move_hold_count_
 799       // fell to 0 and the DispatchHeldEvents executes. Since we're going to
 800       // dispatch the new event directly below, we can reset the old one.
 801       held_move_event_.reset();
 802     }
 803   }
 804
 805   const int kMouseButtonFlagMask = ui::EF_LEFT_MOUSE_BUTTON |
 806                                    ui::EF_MIDDLE_MOUSE_BUTTON |
 807                                    ui::EF_RIGHT_MOUSE_BUTTON;
 808   switch (event->type()) {
 809     case ui::ET_MOUSE_EXITED:
 810       if (!target || target == window()) {
 811         DispatchDetails details =
 812             DispatchMouseEnterOrExit(*event, ui::ET_MOUSE_EXITED);
 813         if (details.dispatcher_destroyed) {
 814           event->SetHandled();
 815           return;
 816         }
 817         mouse_moved_handler_ = NULL;
 818       }
 819       break;
 820     case ui::ET_MOUSE_MOVED:
 821       // Send an exit to the current |mouse_moved_handler_| and an enter to
 822       // |target|. Take care that both us and |target| aren't destroyed during
 823       // dispatch.
 824       if (target != mouse_moved_handler_) {
 825         aura::Window* old_mouse_moved_handler = mouse_moved_handler_;
 826         WindowTracker live_window;
 827         live_window.Add(target);
 828         DispatchDetails details =
 829             DispatchMouseEnterOrExit(*event, ui::ET_MOUSE_EXITED);
 830         if (details.dispatcher_destroyed) {
 831           event->SetHandled();
 832           return;
 833         }
 834         // If the |mouse_moved_handler_| changes out from under us, assume a
 835         // nested message loop ran and we don't need to do anything.
 836         if (mouse_moved_handler_ != old_mouse_moved_handler) {
 837           event->SetHandled();
 838           return;
 839         }
 840         if (!live_window.Contains(target) || details.target_destroyed) {
 841           mouse_moved_handler_ = NULL;
 842           event->SetHandled();
 843           return;
 844         }
 845         live_window.Remove(target);
 846
 847         mouse_moved_handler_ = target;
 848         details = DispatchMouseEnterOrExit(*event, ui::ET_MOUSE_ENTERED);
 849         if (details.dispatcher_destroyed || details.target_destroyed) {
 850           event->SetHandled();
 851           return;
 852         }
 853       }
 854       break;
 855     case ui::ET_MOUSE_PRESSED:
 856       // Don't set the mouse pressed handler for non client mouse down events.
 857       // These are only sent by Windows and are not always followed with non
 858       // client mouse up events which causes subsequent mouse events to be
 859       // sent to the wrong target.
 860       if (!(event->flags() & ui::EF_IS_NON_CLIENT) && !mouse_pressed_handler_)
 861         mouse_pressed_handler_ = target;
 862       Env::GetInstance()->set_mouse_button_flags(
 863           event->flags() & kMouseButtonFlagMask);
 864       break;
 865     case ui::ET_MOUSE_RELEASED:
 866       mouse_pressed_handler_ = NULL;
 867       Env::GetInstance()->set_mouse_button_flags(event->flags() &
 868           kMouseButtonFlagMask & ~event->changed_button_flags());
 869       break;
 870     default:
 871       break;
 872   }
 873
 874   PreDispatchLocatedEvent(target, event);
 875 }
 876
 877 void RootWindow::PreDispatchTouchEvent(Window* target,
 878                                        ui::TouchEvent* event) {
 879   switch (event->type()) {
 880     case ui::ET_TOUCH_PRESSED:
 881       touch_ids_down_ |= (1 << event->touch_id());
 882       Env::GetInstance()->set_touch_down(touch_ids_down_ != 0);
 883       break;
 884
 885       // Handle ET_TOUCH_CANCELLED only if it has a native event.
 886     case ui::ET_TOUCH_CANCELLED:
 887       if (!event->HasNativeEvent())
 888         break;
 889       // fallthrough
 890     case ui::ET_TOUCH_RELEASED:
 891       touch_ids_down_ = (touch_ids_down_ | (1 << event->touch_id())) ^
 892             (1 << event->touch_id());
 893       Env::GetInstance()->set_touch_down(touch_ids_down_ != 0);
 894       break;
 895
 896     case ui::ET_TOUCH_MOVED:
 897       if (move_hold_count_ && !dispatching_held_event_) {
 898         held_move_event_.reset(new ui::TouchEvent(*event, target, window()));
 899         event->SetHandled();
 900         return;
 901       }
 902       break;
 903
 904     default:
 905       NOTREACHED();
 906       break;
 907   }
 908   PreDispatchLocatedEvent(target, event);
 909 }
 910
 911 }  // namespace aura