+
−/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+
−/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+
−/* This Source Code Form is subject to the terms of the Mozilla Public
+
− * License, v. 2.0. If a copy of the MPL was not distributed with this
+
− * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
−
+
−#include "AccessCheck.h"
+
−#include "base/basictypes.h"
+
−#include "ipc/IPCMessageUtils.h"
+
−#include "mozilla/dom/Event.h"
+
−#include "mozilla/dom/ShadowRoot.h"
+
−#include "mozilla/ContentEvents.h"
+
−#include "mozilla/DOMEventTargetHelper.h"
+
−#include "mozilla/EventStateManager.h"
+
−#include "mozilla/InternalMutationEvent.h"
+
−#include "mozilla/dom/Performance.h"
+
−#include "mozilla/MiscEvents.h"
+
−#include "mozilla/MouseEvents.h"
+
−#include "mozilla/Preferences.h"
+
−#include "mozilla/TextEvents.h"
+
−#include "mozilla/TouchEvents.h"
+
−#include "nsContentUtils.h"
+
−#include "nsCOMPtr.h"
+
−#include "nsDeviceContext.h"
+
−#include "nsError.h"
+
−#include "nsGlobalWindow.h"
+
−#include "nsIFrame.h"
+
−#include "nsIContent.h"
+
−#include "nsIDocument.h"
+
−#include "nsIPresShell.h"
+
−#include "nsIScrollableFrame.h"
+
−#include "nsJSEnvironment.h"
+
−#include "nsLayoutUtils.h"
+
−#include "nsPIWindowRoot.h"
+
−#include "nsRFPService.h"
+
−#include "WorkerPrivate.h"
+
−
+
−namespace mozilla {
+
−namespace dom {
+
−
+
−static char *sPopupAllowedEvents;
+
−
+
−static bool sReturnHighResTimeStamp = false;
+
−static bool sReturnHighResTimeStampIsSet = false;
+
−
+
−Event::Event(EventTarget* aOwner,
+
−             nsPresContext* aPresContext,
+
−             WidgetEvent* aEvent)
+
−{
+
−  ConstructorInit(aOwner, aPresContext, aEvent);
+
−}
+
−
+
−Event::Event(nsPIDOMWindowInner* aParent)
+
−{
+
−  ConstructorInit(nsGlobalWindow::Cast(aParent), nullptr, nullptr);
+
−}
+
−
+
−void
+
−Event::ConstructorInit(EventTarget* aOwner,
+
−                       nsPresContext* aPresContext,
+
−                       WidgetEvent* aEvent)
+
−{
+
−  SetOwner(aOwner);
+
−  mIsMainThreadEvent = NS_IsMainThread();
+
−
+
−  if (mIsMainThreadEvent && !sReturnHighResTimeStampIsSet) {
+
−    Preferences::AddBoolVarCache(&sReturnHighResTimeStamp,
+
−                                 "dom.event.highrestimestamp.enabled",
+
−                                 sReturnHighResTimeStamp);
+
−    sReturnHighResTimeStampIsSet = true;
+
−  }
+
−
+
−  mPrivateDataDuplicated = false;
+
−  mWantsPopupControlCheck = false;
+
−
+
−  if (aEvent) {
+
−    mEvent = aEvent;
+
−    mEventIsInternal = false;
+
−  }
+
−  else {
+
−    mEventIsInternal = true;
+
−    /*
+
−      A derived class might want to allocate its own type of aEvent
+
−      (derived from WidgetEvent). To do this, it should take care to pass
+
−      a non-nullptr aEvent to this ctor, e.g.:
+
−      
+
−        FooEvent::FooEvent(..., WidgetEvent* aEvent)
+
−          : Event(..., aEvent ? aEvent : new WidgetEvent())
+
−      
+
−      Then, to override the mEventIsInternal assignments done by the
+
−      base ctor, it should do this in its own ctor:
+
−
+
−        FooEvent::FooEvent(..., WidgetEvent* aEvent)
+
−        ...
+
−        {
+
−          ...
+
−          if (aEvent) {
+
−            mEventIsInternal = false;
+
−          }
+
−          else {
+
−            mEventIsInternal = true;
+
−          }
+
−          ...
+
−        }
+
−     */
+
−    mEvent = new WidgetEvent(false, eVoidEvent);
+
−    mEvent->mTime = PR_Now();
+
−  }
+
−
+
−  InitPresContextData(aPresContext);
+
−}
+
−
+
−void
+
−Event::InitPresContextData(nsPresContext* aPresContext)
+
−{
+
−  mPresContext = aPresContext;
+
−  // Get the explicit original target (if it's anonymous make it null)
+
−  {
+
−    nsCOMPtr<nsIContent> content = GetTargetFromFrame();
+
−    mExplicitOriginalTarget = content;
+
−    if (content && content->IsInAnonymousSubtree()) {
+
−      mExplicitOriginalTarget = nullptr;
+
−    }
+
−  }
+
−}
+
−
+
−Event::~Event() 
+
−{
+
−  NS_ASSERT_OWNINGTHREAD(Event);
+
−
+
−  if (mEventIsInternal && mEvent) {
+
−    delete mEvent;
+
−  }
+
−}
+
−
+
−NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Event)
+
−  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+
−  NS_INTERFACE_MAP_ENTRY(nsISupports)
+
−  NS_INTERFACE_MAP_ENTRY(nsIDOMEvent)
+
−NS_INTERFACE_MAP_END
+
−
+
−NS_IMPL_CYCLE_COLLECTING_ADDREF(Event)
+
−NS_IMPL_CYCLE_COLLECTING_RELEASE(Event)
+
−
+
−NS_IMPL_CYCLE_COLLECTION_CLASS(Event)
+
−
+
−NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(Event)
+
−  NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
+
−NS_IMPL_CYCLE_COLLECTION_TRACE_END
+
−
+
−NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(Event)
+
−  if (tmp->mEventIsInternal) {
+
−    tmp->mEvent->mTarget = nullptr;
+
−    tmp->mEvent->mCurrentTarget = nullptr;
+
−    tmp->mEvent->mOriginalTarget = nullptr;
+
−    switch (tmp->mEvent->mClass) {
+
−      case eMouseEventClass:
+
−      case eMouseScrollEventClass:
+
−      case eWheelEventClass:
+
−      case eSimpleGestureEventClass:
+
−      case ePointerEventClass:
+
−        tmp->mEvent->AsMouseEventBase()->relatedTarget = nullptr;
+
−        break;
+
−      case eDragEventClass: {
+
−        WidgetDragEvent* dragEvent = tmp->mEvent->AsDragEvent();
+
−        dragEvent->mDataTransfer = nullptr;
+
−        dragEvent->relatedTarget = nullptr;
+
−        break;
+
−      }
+
−      case eClipboardEventClass:
+
−        tmp->mEvent->AsClipboardEvent()->mClipboardData = nullptr;
+
−        break;
+
−      case eMutationEventClass:
+
−        tmp->mEvent->AsMutationEvent()->mRelatedNode = nullptr;
+
−        break;
+
−      case eFocusEventClass:
+
−        tmp->mEvent->AsFocusEvent()->mRelatedTarget = nullptr;
+
−        break;
+
−      default:
+
−        break;
+
−    }
+
−  }
+
−  NS_IMPL_CYCLE_COLLECTION_UNLINK(mPresContext);
+
−  NS_IMPL_CYCLE_COLLECTION_UNLINK(mExplicitOriginalTarget);
+
−  NS_IMPL_CYCLE_COLLECTION_UNLINK(mOwner);
+
−  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+
−NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
−
+
−NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(Event)
+
−  if (tmp->mEventIsInternal) {
+
−    NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->mTarget)
+
−    NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->mCurrentTarget)
+
−    NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEvent->mOriginalTarget)
+
−    switch (tmp->mEvent->mClass) {
+
−      case eMouseEventClass:
+
−      case eMouseScrollEventClass:
+
−      case eWheelEventClass:
+
−      case eSimpleGestureEventClass:
+
−      case ePointerEventClass:
+
−        NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->relatedTarget");
+
−        cb.NoteXPCOMChild(tmp->mEvent->AsMouseEventBase()->relatedTarget);
+
−        break;
+
−      case eDragEventClass: {
+
−        WidgetDragEvent* dragEvent = tmp->mEvent->AsDragEvent();
+
−        NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mDataTransfer");
+
−        cb.NoteXPCOMChild(dragEvent->mDataTransfer);
+
−        NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->relatedTarget");
+
−        cb.NoteXPCOMChild(dragEvent->relatedTarget);
+
−        break;
+
−      }
+
−      case eClipboardEventClass:
+
−        NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mClipboardData");
+
−        cb.NoteXPCOMChild(tmp->mEvent->AsClipboardEvent()->mClipboardData);
+
−        break;
+
−      case eMutationEventClass:
+
−        NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mRelatedNode");
+
−        cb.NoteXPCOMChild(tmp->mEvent->AsMutationEvent()->mRelatedNode);
+
−        break;
+
−      case eFocusEventClass:
+
−        NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mEvent->mRelatedTarget");
+
−        cb.NoteXPCOMChild(tmp->mEvent->AsFocusEvent()->mRelatedTarget);
+
−        break;
+
−      default:
+
−        break;
+
−    }
+
−  }
+
−  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPresContext)
+
−  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mExplicitOriginalTarget)
+
−  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mOwner)
+
−NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
−
+
−
+
−JSObject*
+
−Event::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+
−{
+
−  return WrapObjectInternal(aCx, aGivenProto);
+
−}
+
−
+
−JSObject*
+
−Event::WrapObjectInternal(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
+
−{
+
−  return EventBinding::Wrap(aCx, this, aGivenProto);
+
−}
+
−
+
−// nsIDOMEventInterface
+
−NS_IMETHODIMP
+
−Event::GetType(nsAString& aType)
+
−{
+
−  if (!mIsMainThreadEvent) {
+
−    aType = mEvent->mSpecifiedEventTypeString;
+
−    return NS_OK;
+
−  }
+
−  GetWidgetEventType(mEvent, aType);
+
−  return NS_OK;
+
−}
+
−
+
−EventTarget*
+
−Event::GetTarget() const
+
−{
+
−  return mEvent->GetDOMEventTarget();
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetTarget(nsIDOMEventTarget** aTarget)
+
−{
+
−  NS_IF_ADDREF(*aTarget = GetTarget());
+
−  return NS_OK;
+
−}
+
−
+
−EventTarget*
+
−Event::GetCurrentTarget() const
+
−{
+
−  return mEvent->GetCurrentDOMEventTarget();
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetCurrentTarget(nsIDOMEventTarget** aCurrentTarget)
+
−{
+
−  NS_IF_ADDREF(*aCurrentTarget = GetCurrentTarget());
+
−  return NS_OK;
+
−}
+
−
+
−//
+
−// Get the actual event target node (may have been retargeted for mouse events)
+
−//
+
−already_AddRefed<nsIContent>
+
−Event::GetTargetFromFrame()
+
−{
+
−  if (!mPresContext) { return nullptr; }
+
−
+
−  // Get the mTarget frame (have to get the ESM first)
+
−  nsIFrame* targetFrame = mPresContext->EventStateManager()->GetEventTarget();
+
−  if (!targetFrame) { return nullptr; }
+
−
+
−  // get the real content
+
−  nsCOMPtr<nsIContent> realEventContent;
+
−  targetFrame->GetContentForEvent(mEvent, getter_AddRefs(realEventContent));
+
−  return realEventContent.forget();
+
−}
+
−
+
−EventTarget*
+
−Event::GetExplicitOriginalTarget() const
+
−{
+
−  if (mExplicitOriginalTarget) {
+
−    return mExplicitOriginalTarget;
+
−  }
+
−  return GetTarget();
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetExplicitOriginalTarget(nsIDOMEventTarget** aRealEventTarget)
+
−{
+
−  NS_IF_ADDREF(*aRealEventTarget = GetExplicitOriginalTarget());
+
−  return NS_OK;
+
−}
+
−
+
−EventTarget*
+
−Event::GetOriginalTarget() const
+
−{
+
−  return mEvent->GetOriginalDOMEventTarget();
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetOriginalTarget(nsIDOMEventTarget** aOriginalTarget)
+
−{
+
−  NS_IF_ADDREF(*aOriginalTarget = GetOriginalTarget());
+
−  return NS_OK;
+
−}
+
−
+
−EventTarget*
+
−Event::GetComposedTarget() const
+
−{
+
−  EventTarget* et = GetOriginalTarget();
+
−  nsCOMPtr<nsIContent> content = do_QueryInterface(et);
+
−  if (!content) {
+
−    return et;
+
−  }
+
−  nsIContent* nonChrome = content->FindFirstNonChromeOnlyAccessContent();
+
−  return nonChrome ?
+
−    static_cast<EventTarget*>(nonChrome) :
+
−    static_cast<EventTarget*>(content->GetComposedDoc());
+
−}
+
−
+
−NS_IMETHODIMP_(void)
+
−Event::SetTrusted(bool aTrusted)
+
−{
+
−  mEvent->mFlags.mIsTrusted = aTrusted;
+
−}
+
−
+
−bool
+
−Event::Init(mozilla::dom::EventTarget* aGlobal)
+
−{
+
−  if (!mIsMainThreadEvent) {
+
−    return workers::IsCurrentThreadRunningChromeWorker();
+
−  }
+
−  bool trusted = false;
+
−  nsCOMPtr<nsPIDOMWindowInner> w = do_QueryInterface(aGlobal);
+
−  if (w) {
+
−    nsCOMPtr<nsIDocument> d = w->GetExtantDoc();
+
−    if (d) {
+
−      trusted = nsContentUtils::IsChromeDoc(d);
+
−      nsIPresShell* s = d->GetShell();
+
−      if (s) {
+
−        InitPresContextData(s->GetPresContext());
+
−      }
+
−    }
+
−  }
+
−  return trusted;
+
−}
+
−
+
−// static
+
−already_AddRefed<Event>
+
−Event::Constructor(const GlobalObject& aGlobal,
+
−                   const nsAString& aType,
+
−                   const EventInit& aParam,
+
−                   ErrorResult& aRv)
+
−{
+
−  nsCOMPtr<mozilla::dom::EventTarget> t = do_QueryInterface(aGlobal.GetAsSupports());
+
−  return Constructor(t, aType, aParam);
+
−}
+
−
+
−// static
+
−already_AddRefed<Event>
+
−Event::Constructor(EventTarget* aEventTarget,
+
−                   const nsAString& aType,
+
−                   const EventInit& aParam)
+
−{
+
−  RefPtr<Event> e = new Event(aEventTarget, nullptr, nullptr);
+
−  bool trusted = e->Init(aEventTarget);
+
−  e->InitEvent(aType, aParam.mBubbles, aParam.mCancelable);
+
−  e->SetTrusted(trusted);
+
−  e->SetComposed(aParam.mComposed);
+
−  return e.forget();
+
−}
+
−
+
−uint16_t
+
−Event::EventPhase() const
+
−{
+
−  // Note, remember to check that this works also
+
−  // if or when Bug 235441 is fixed.
+
−  if ((mEvent->mCurrentTarget &&
+
−       mEvent->mCurrentTarget == mEvent->mTarget) ||
+
−       mEvent->mFlags.InTargetPhase()) {
+
−    return nsIDOMEvent::AT_TARGET;
+
−  }
+
−  if (mEvent->mFlags.mInCapturePhase) {
+
−    return nsIDOMEvent::CAPTURING_PHASE;
+
−  }
+
−  if (mEvent->mFlags.mInBubblingPhase) {
+
−    return nsIDOMEvent::BUBBLING_PHASE;
+
−  }
+
−  return nsIDOMEvent::NONE;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetEventPhase(uint16_t* aEventPhase)
+
−{
+
−  *aEventPhase = EventPhase();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetBubbles(bool* aBubbles)
+
−{
+
−  *aBubbles = Bubbles();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetCancelable(bool* aCancelable)
+
−{
+
−  *aCancelable = Cancelable();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetTimeStamp(uint64_t* aTimeStamp)
+
−{
+
−  *aTimeStamp = mEvent->mTime;
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::StopPropagation()
+
−{
+
−  mEvent->StopPropagation();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::StopImmediatePropagation()
+
−{
+
−  mEvent->StopImmediatePropagation();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::StopCrossProcessForwarding()
+
−{
+
−  mEvent->StopCrossProcessForwarding();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetIsTrusted(bool* aIsTrusted)
+
−{
+
−  *aIsTrusted = IsTrusted();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::PreventDefault()
+
−{
+
−  // This method is called only from C++ code which must handle default action
+
−  // of this event.  So, pass true always.
+
−  PreventDefaultInternal(true);
+
−  return NS_OK;
+
−}
+
−
+
−void
+
−Event::PreventDefault(JSContext* aCx, CallerType aCallerType)
+
−{
+
−  // Note that at handling default action, another event may be dispatched.
+
−  // Then, JS in content mey be call preventDefault()
+
−  // even in the event is in system event group.  Therefore, don't refer
+
−  // mInSystemGroup here.
+
−  PreventDefaultInternal(aCallerType == CallerType::System);
+
−}
+
−
+
−void
+
−Event::PreventDefaultInternal(bool aCalledByDefaultHandler)
+
−{
+
−  if (!mEvent->mFlags.mCancelable) {
+
−    return;
+
−  }
+
−  if (mEvent->mFlags.mInPassiveListener) {
+
−    nsCOMPtr<nsPIDOMWindowInner> win(do_QueryInterface(mOwner));
+
−    if (win) {
+
−      if (nsIDocument* doc = win->GetExtantDoc()) {
+
−        nsString type;
+
−        GetType(type);
+
−        const char16_t* params[] = { type.get() };
+
−        doc->WarnOnceAbout(nsIDocument::ePreventDefaultFromPassiveListener,
+
−          false, params, ArrayLength(params));
+
−      }
+
−    }
+
−    return;
+
−  }
+
−
+
−  mEvent->PreventDefault(aCalledByDefaultHandler);
+
−
+
−  if (!IsTrusted()) {
+
−    return;
+
−  }
+
−
+
−  WidgetDragEvent* dragEvent = mEvent->AsDragEvent();
+
−  if (!dragEvent) {
+
−    return;
+
−  }
+
−
+
−  nsCOMPtr<nsINode> node = do_QueryInterface(mEvent->mCurrentTarget);
+
−  if (!node) {
+
−    nsCOMPtr<nsPIDOMWindowOuter> win =
+
−      do_QueryInterface(mEvent->mCurrentTarget);
+
−    if (!win) {
+
−      return;
+
−    }
+
−    node = win->GetExtantDoc();
+
−  }
+
−  if (!nsContentUtils::IsChromeDoc(node->OwnerDoc())) {
+
−    dragEvent->mDefaultPreventedOnContent = true;
+
−  }
+
−}
+
−
+
−void
+
−Event::SetEventType(const nsAString& aEventTypeArg)
+
−{
+
−  if (mIsMainThreadEvent) {
+
−    mEvent->mSpecifiedEventTypeString.Truncate();
+
−    mEvent->mSpecifiedEventType =
+
−      nsContentUtils::GetEventMessageAndAtom(aEventTypeArg, mEvent->mClass,
+
−                                             &(mEvent->mMessage));
+
−    mEvent->SetDefaultComposed();
+
−  } else {
+
−    mEvent->mSpecifiedEventType = nullptr;
+
−    mEvent->mMessage = eUnidentifiedEvent;
+
−    mEvent->mSpecifiedEventTypeString = aEventTypeArg;
+
−    mEvent->SetComposed(aEventTypeArg);
+
−  }
+
−  mEvent->SetDefaultComposedInNativeAnonymousContent();
+
−}
+
−
+
−already_AddRefed<EventTarget>
+
−Event::EnsureWebAccessibleRelatedTarget(EventTarget* aRelatedTarget)
+
−{
+
−  nsCOMPtr<EventTarget> relatedTarget = aRelatedTarget;
+
−  if (relatedTarget) {
+
−    nsCOMPtr<nsIContent> content = do_QueryInterface(relatedTarget);
+
−    nsCOMPtr<nsIContent> currentTarget =
+
−      do_QueryInterface(mEvent->mCurrentTarget);
+
−
+
−    if (content && content->ChromeOnlyAccess() &&
+
−        !nsContentUtils::CanAccessNativeAnon()) {
+
−      content = content->FindFirstNonChromeOnlyAccessContent();
+
−      relatedTarget = do_QueryInterface(content);
+
−    }
+
−
+
−    nsIContent* shadowRelatedTarget =
+
−      GetShadowRelatedTarget(currentTarget, content);
+
−    if (shadowRelatedTarget) {
+
−      relatedTarget = shadowRelatedTarget;
+
−    }
+
−
+
−    if (relatedTarget) {
+
−      relatedTarget = relatedTarget->GetTargetForDOMEvent();
+
−    }
+
−  }
+
−  return relatedTarget.forget();
+
−}
+
−
+
−void
+
−Event::InitEvent(const nsAString& aEventTypeArg,
+
−                 bool aCanBubbleArg,
+
−                 bool aCancelableArg)
+
−{
+
−  // Make sure this event isn't already being dispatched.
+
−  NS_ENSURE_TRUE_VOID(!mEvent->mFlags.mIsBeingDispatched);
+
−
+
−  if (IsTrusted()) {
+
−    // Ensure the caller is permitted to dispatch trusted DOM events.
+
−    if (!nsContentUtils::ThreadsafeIsCallerChrome()) {
+
−      SetTrusted(false);
+
−    }
+
−  }
+
−
+
−  SetEventType(aEventTypeArg);
+
−
+
−  mEvent->mFlags.mBubbles = aCanBubbleArg;
+
−  mEvent->mFlags.mCancelable = aCancelableArg;
+
−
+
−  mEvent->mFlags.mDefaultPrevented = false;
+
−  mEvent->mFlags.mDefaultPreventedByContent = false;
+
−  mEvent->mFlags.mDefaultPreventedByChrome = false;
+
−  mEvent->mFlags.mPropagationStopped = false;
+
−  mEvent->mFlags.mImmediatePropagationStopped = false;
+
−
+
−  // Clearing the old targets, so that the event is targeted correctly when
+
−  // re-dispatching it.
+
−  mEvent->mTarget = nullptr;
+
−  mEvent->mOriginalTarget = nullptr;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::DuplicatePrivateData()
+
−{
+
−  NS_ASSERTION(mEvent, "No WidgetEvent for Event duplication!");
+
−  if (mEventIsInternal) {
+
−    return NS_OK;
+
−  }
+
−
+
−  mEvent = mEvent->Duplicate();
+
−  mPresContext = nullptr;
+
−  mEventIsInternal = true;
+
−  mPrivateDataDuplicated = true;
+
−
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::SetTarget(nsIDOMEventTarget* aTarget)
+
−{
+
−  mEvent->mTarget = do_QueryInterface(aTarget);
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP_(bool)
+
−Event::IsDispatchStopped()
+
−{
+
−  return mEvent->PropagationStopped();
+
−}
+
−
+
−NS_IMETHODIMP_(WidgetEvent*)
+
−Event::WidgetEventPtr()
+
−{
+
−  return mEvent;
+
−}
+
−
+
−NS_IMETHODIMP_(Event*)
+
−Event::InternalDOMEvent()
+
−{
+
−  return this;
+
−}
+
−
+
−// return true if eventName is contained within events, delimited by
+
−// spaces
+
−static bool
+
−PopupAllowedForEvent(const char *eventName)
+
−{
+
−  if (!sPopupAllowedEvents) {
+
−    Event::PopupAllowedEventsChanged();
+
−
+
−    if (!sPopupAllowedEvents) {
+
−      return false;
+
−    }
+
−  }
+
−
+
−  nsDependentCString events(sPopupAllowedEvents);
+
−
+
−  nsCString::const_iterator start, end;
+
−  nsCString::const_iterator startiter(events.BeginReading(start));
+
−  events.EndReading(end);
+
−
+
−  while (startiter != end) {
+
−    nsCString::const_iterator enditer(end);
+
−
+
−    if (!FindInReadable(nsDependentCString(eventName), startiter, enditer))
+
−      return false;
+
−
+
−    // the match is surrounded by spaces, or at a string boundary
+
−    if ((startiter == start || *--startiter == ' ') &&
+
−        (enditer == end || *enditer == ' ')) {
+
−      return true;
+
−    }
+
−
+
−    // Move on and see if there are other matches. (The delimitation
+
−    // requirement makes it pointless to begin the next search before
+
−    // the end of the invalid match just found.)
+
−    startiter = enditer;
+
−  }
+
−
+
−  return false;
+
−}
+
−
+
−// static
+
−PopupControlState
+
−Event::GetEventPopupControlState(WidgetEvent* aEvent, nsIDOMEvent* aDOMEvent)
+
−{
+
−  // generally if an event handler is running, new windows are disallowed.
+
−  // check for exceptions:
+
−  PopupControlState abuse = openAbused;
+
−
+
−  if (aDOMEvent && aDOMEvent->InternalDOMEvent()->GetWantsPopupControlCheck()) {
+
−    nsAutoString type;
+
−    aDOMEvent->GetType(type);
+
−    if (PopupAllowedForEvent(NS_ConvertUTF16toUTF8(type).get())) {
+
−      return openAllowed;
+
−    }
+
−  }
+
−
+
−  switch(aEvent->mClass) {
+
−  case eBasicEventClass:
+
−    // For these following events only allow popups if they're
+
−    // triggered while handling user input. See
+
−    // nsPresShell::HandleEventInternal() for details.
+
−    if (EventStateManager::IsHandlingUserInput()) {
+
−      switch(aEvent->mMessage) {
+
−      case eFormSelect:
+
−        if (PopupAllowedForEvent("select")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case eFormChange:
+
−        if (PopupAllowedForEvent("change")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      default:
+
−        break;
+
−      }
+
−    }
+
−    break;
+
−  case eEditorInputEventClass:
+
−    // For this following event only allow popups if it's triggered
+
−    // while handling user input. See
+
−    // nsPresShell::HandleEventInternal() for details.
+
−    if (EventStateManager::IsHandlingUserInput()) {
+
−      switch(aEvent->mMessage) {
+
−      case eEditorInput:
+
−        if (PopupAllowedForEvent("input")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      default:
+
−        break;
+
−      }
+
−    }
+
−    break;
+
−  case eInputEventClass:
+
−    // For this following event only allow popups if it's triggered
+
−    // while handling user input. See
+
−    // nsPresShell::HandleEventInternal() for details.
+
−    if (EventStateManager::IsHandlingUserInput()) {
+
−      switch(aEvent->mMessage) {
+
−      case eFormChange:
+
−        if (PopupAllowedForEvent("change")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case eXULCommand:
+
−        abuse = openControlled;
+
−        break;
+
−      default:
+
−        break;
+
−      }
+
−    }
+
−    break;
+
−  case eKeyboardEventClass:
+
−    if (aEvent->IsTrusted()) {
+
−      uint32_t key = aEvent->AsKeyboardEvent()->mKeyCode;
+
−      switch(aEvent->mMessage) {
+
−      case eKeyPress:
+
−        // return key on focused button. see note at eMouseClick.
+
−        if (key == NS_VK_RETURN) {
+
−          abuse = openAllowed;
+
−        } else if (PopupAllowedForEvent("keypress")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case eKeyUp:
+
−        // space key on focused button. see note at eMouseClick.
+
−        if (key == NS_VK_SPACE) {
+
−          abuse = openAllowed;
+
−        } else if (PopupAllowedForEvent("keyup")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case eKeyDown:
+
−        if (PopupAllowedForEvent("keydown")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      default:
+
−        break;
+
−      }
+
−    }
+
−    break;
+
−  case eTouchEventClass:
+
−    if (aEvent->IsTrusted()) {
+
−      switch (aEvent->mMessage) {
+
−      case eTouchStart:
+
−        if (PopupAllowedForEvent("touchstart")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case eTouchEnd:
+
−        if (PopupAllowedForEvent("touchend")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      default:
+
−        break;
+
−      }
+
−    }
+
−    break;
+
−  case eMouseEventClass:
+
−    if (aEvent->IsTrusted() &&
+
−        aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton) {
+
−      switch(aEvent->mMessage) {
+
−      case eMouseUp:
+
−        if (PopupAllowedForEvent("mouseup")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case eMouseDown:
+
−        if (PopupAllowedForEvent("mousedown")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case eMouseClick:
+
−        /* Click events get special treatment because of their
+
−           historical status as a more legitimate event handler. If
+
−           click popups are enabled in the prefs, clear the popup
+
−           status completely. */
+
−        if (PopupAllowedForEvent("click")) {
+
−          abuse = openAllowed;
+
−        }
+
−        break;
+
−      case eMouseDoubleClick:
+
−        if (PopupAllowedForEvent("dblclick")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      default:
+
−        break;
+
−      }
+
−    }
+
−    break;
+
−  case ePointerEventClass:
+
−    if (aEvent->IsTrusted() &&
+
−        aEvent->AsPointerEvent()->button == WidgetMouseEvent::eLeftButton) {
+
−      switch(aEvent->mMessage) {
+
−      case ePointerUp:
+
−        if (PopupAllowedForEvent("pointerup")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case ePointerDown:
+
−        if (PopupAllowedForEvent("pointerdown")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      default:
+
−        break;
+
−      }
+
−    }
+
−    break;
+
−  case eFormEventClass:
+
−    // For these following events only allow popups if they're
+
−    // triggered while handling user input. See
+
−    // nsPresShell::HandleEventInternal() for details.
+
−    if (EventStateManager::IsHandlingUserInput()) {
+
−      switch(aEvent->mMessage) {
+
−      case eFormSubmit:
+
−        if (PopupAllowedForEvent("submit")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      case eFormReset:
+
−        if (PopupAllowedForEvent("reset")) {
+
−          abuse = openControlled;
+
−        }
+
−        break;
+
−      default:
+
−        break;
+
−      }
+
−    }
+
−    break;
+
−  default:
+
−    break;
+
−  }
+
−
+
−  return abuse;
+
−}
+
−
+
−// static
+
−void
+
−Event::PopupAllowedEventsChanged()
+
−{
+
−  if (sPopupAllowedEvents) {
+
−    free(sPopupAllowedEvents);
+
−  }
+
−
+
−  nsAdoptingCString str = Preferences::GetCString("dom.popup_allowed_events");
+
−
+
−  // We'll want to do this even if str is empty to avoid looking up
+
−  // this pref all the time if it's not set.
+
−  sPopupAllowedEvents = ToNewCString(str);
+
−}
+
−
+
−// static
+
−void
+
−Event::Shutdown()
+
−{
+
−  if (sPopupAllowedEvents) {
+
−    free(sPopupAllowedEvents);
+
−  }
+
−}
+
−
+
−// static
+
−CSSIntPoint
+
−Event::GetScreenCoords(nsPresContext* aPresContext,
+
−                       WidgetEvent* aEvent,
+
−                       LayoutDeviceIntPoint aPoint)
+
−{
+
−  if (EventStateManager::sIsPointerLocked) {
+
−    return EventStateManager::sLastScreenPoint;
+
−  }
+
−
+
−  if (!aEvent ||
+
−       (aEvent->mClass != eMouseEventClass &&
+
−        aEvent->mClass != eMouseScrollEventClass &&
+
−        aEvent->mClass != eWheelEventClass &&
+
−        aEvent->mClass != ePointerEventClass &&
+
−        aEvent->mClass != eTouchEventClass &&
+
−        aEvent->mClass != eDragEventClass &&
+
−        aEvent->mClass != eSimpleGestureEventClass)) {
+
−    return CSSIntPoint(0, 0);
+
−  }
+
−
+
−  // Doing a straight conversion from LayoutDeviceIntPoint to CSSIntPoint
+
−  // seem incorrect, but it is needed to maintain legacy functionality.
+
−  WidgetGUIEvent* guiEvent = aEvent->AsGUIEvent();
+
−  if (!aPresContext || !(guiEvent && guiEvent->mWidget)) {
+
−    return CSSIntPoint(aPoint.x, aPoint.y);
+
−  }
+
−
+
−  nsPoint pt =
+
−    LayoutDevicePixel::ToAppUnits(aPoint, aPresContext->DeviceContext()->AppUnitsPerDevPixelAtUnitFullZoom());
+
−
+
−  if (nsIPresShell* ps = aPresContext->GetPresShell()) {
+
−    pt = pt.RemoveResolution(nsLayoutUtils::GetCurrentAPZResolutionScale(ps));
+
−  }
+
−
+
−  pt += LayoutDevicePixel::ToAppUnits(guiEvent->mWidget->WidgetToScreenOffset(),
+
−                                      aPresContext->DeviceContext()->AppUnitsPerDevPixelAtUnitFullZoom());
+
−
+
−  return CSSPixel::FromAppUnitsRounded(pt);
+
−}
+
−
+
−// static
+
−CSSIntPoint
+
−Event::GetPageCoords(nsPresContext* aPresContext,
+
−                     WidgetEvent* aEvent,
+
−                     LayoutDeviceIntPoint aPoint,
+
−                     CSSIntPoint aDefaultPoint)
+
−{
+
−  CSSIntPoint pagePoint =
+
−    Event::GetClientCoords(aPresContext, aEvent, aPoint, aDefaultPoint);
+
−
+
−  // If there is some scrolling, add scroll info to client point.
+
−  if (aPresContext && aPresContext->GetPresShell()) {
+
−    nsIPresShell* shell = aPresContext->GetPresShell();
+
−    nsIScrollableFrame* scrollframe = shell->GetRootScrollFrameAsScrollable();
+
−    if (scrollframe) {
+
−      pagePoint += CSSIntPoint::FromAppUnitsRounded(scrollframe->GetScrollPosition());
+
−    }
+
−  }
+
−
+
−  return pagePoint;
+
−}
+
−
+
−// static
+
−CSSIntPoint
+
−Event::GetClientCoords(nsPresContext* aPresContext,
+
−                       WidgetEvent* aEvent,
+
−                       LayoutDeviceIntPoint aPoint,
+
−                       CSSIntPoint aDefaultPoint)
+
−{
+
−  if (EventStateManager::sIsPointerLocked) {
+
−    return EventStateManager::sLastClientPoint;
+
−  }
+
−
+
−  if (!aEvent ||
+
−      (aEvent->mClass != eMouseEventClass &&
+
−       aEvent->mClass != eMouseScrollEventClass &&
+
−       aEvent->mClass != eWheelEventClass &&
+
−       aEvent->mClass != eTouchEventClass &&
+
−       aEvent->mClass != eDragEventClass &&
+
−       aEvent->mClass != ePointerEventClass &&
+
−       aEvent->mClass != eSimpleGestureEventClass) ||
+
−      !aPresContext ||
+
−      !aEvent->AsGUIEvent()->mWidget) {
+
−    return aDefaultPoint;
+
−  }
+
−
+
−  nsIPresShell* shell = aPresContext->GetPresShell();
+
−  if (!shell) {
+
−    return CSSIntPoint(0, 0);
+
−  }
+
−  nsIFrame* rootFrame = shell->GetRootFrame();
+
−  if (!rootFrame) {
+
−    return CSSIntPoint(0, 0);
+
−  }
+
−  nsPoint pt =
+
−    nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent, aPoint, rootFrame);
+
−
+
−  return CSSIntPoint::FromAppUnitsRounded(pt);
+
−}
+
−
+
−// static
+
−CSSIntPoint
+
−Event::GetOffsetCoords(nsPresContext* aPresContext,
+
−                       WidgetEvent* aEvent,
+
−                       LayoutDeviceIntPoint aPoint,
+
−                       CSSIntPoint aDefaultPoint)
+
−{
+
−  if (!aEvent->mTarget) {
+
−    return GetPageCoords(aPresContext, aEvent, aPoint, aDefaultPoint);
+
−  }
+
−  nsCOMPtr<nsIContent> content = do_QueryInterface(aEvent->mTarget);
+
−  if (!content || !aPresContext) {
+
−    return CSSIntPoint(0, 0);
+
−  }
+
−  nsCOMPtr<nsIPresShell> shell = aPresContext->GetPresShell();
+
−  if (!shell) {
+
−    return CSSIntPoint(0, 0);
+
−  }
+
−  shell->FlushPendingNotifications(FlushType::Layout);
+
−  nsIFrame* frame = content->GetPrimaryFrame();
+
−  if (!frame) {
+
−    return CSSIntPoint(0, 0);
+
−  }
+
−  nsIFrame* rootFrame = shell->GetRootFrame();
+
−  if (!rootFrame) {
+
−    return CSSIntPoint(0, 0);
+
−  }
+
−  CSSIntPoint clientCoords =
+
−    GetClientCoords(aPresContext, aEvent, aPoint, aDefaultPoint);
+
−  nsPoint pt = CSSPixel::ToAppUnits(clientCoords);
+
−  if (nsLayoutUtils::TransformPoint(rootFrame, frame, pt) ==
+
−      nsLayoutUtils::TRANSFORM_SUCCEEDED) {
+
−    pt -= frame->GetPaddingRectRelativeToSelf().TopLeft();
+
−    return CSSPixel::FromAppUnitsRounded(pt);
+
−  }
+
−  return CSSIntPoint(0, 0);
+
−}
+
−
+
−// To be called ONLY by Event::GetType (which has the additional
+
−// logic for handling user-defined events).
+
−// static
+
−const char*
+
−Event::GetEventName(EventMessage aEventType)
+
−{
+
−  switch(aEventType) {
+
−#define MESSAGE_TO_EVENT(name_, _message, _type, _struct) \
+
−  case _message: return #name_;
+
−#include "mozilla/EventNameList.h"
+
−#undef MESSAGE_TO_EVENT
+
−  default:
+
−    break;
+
−  }
+
−  // XXXldb We can hit this case for WidgetEvent objects that we didn't
+
−  // create and that are not user defined events since this function and
+
−  // SetEventType are incomplete.  (But fixing that requires fixing the
+
−  // arrays in nsEventListenerManager too, since the events for which
+
−  // this is a problem generally *are* created by Event.)
+
−  return nullptr;
+
−}
+
−
+
−bool
+
−Event::DefaultPrevented(CallerType aCallerType) const
+
−{
+
−  NS_ENSURE_TRUE(mEvent, false);
+
−
+
−  // If preventDefault() has never been called, just return false.
+
−  if (!mEvent->DefaultPrevented()) {
+
−    return false;
+
−  }
+
−
+
−  // If preventDefault() has been called by content, return true.  Otherwise,
+
−  // i.e., preventDefault() has been called by chrome, return true only when
+
−  // this is called by chrome.
+
−  return mEvent->DefaultPreventedByContent() ||
+
−         aCallerType == CallerType::System;
+
−}
+
−
+
−double
+
−Event::TimeStampImpl() const
+
−{
+
−  if (!sReturnHighResTimeStamp) {
+
−    return static_cast<double>(mEvent->mTime);
+
−  }
+
−
+
−  if (mEvent->mTimeStamp.IsNull()) {
+
−    return 0.0;
+
−  }
+
−
+
−  if (mIsMainThreadEvent) {
+
−    if (NS_WARN_IF(!mOwner)) {
+
−      return 0.0;
+
−    }
+
−
+
−    nsCOMPtr<nsPIDOMWindowInner> win = do_QueryInterface(mOwner);
+
−    if (NS_WARN_IF(!win)) {
+
−      return 0.0;
+
−    }
+
−
+
−    Performance* perf = win->GetPerformance();
+
−    if (NS_WARN_IF(!perf)) {
+
−      return 0.0;
+
−    }
+
−
+
−    return perf->GetDOMTiming()->TimeStampToDOMHighRes(mEvent->mTimeStamp);
+
−  }
+
−
+
−  workers::WorkerPrivate* workerPrivate =
+
−    workers::GetCurrentThreadWorkerPrivate();
+
−  MOZ_ASSERT(workerPrivate);
+
−
+
−  return workerPrivate->TimeStampToDOMHighRes(mEvent->mTimeStamp);
+
−}
+
−
+
−double
+
−Event::TimeStamp() const
+
−{
+
−  return nsRFPService::ReduceTimePrecisionAsMSecs(TimeStampImpl());
+
−}
+
−
+
−bool
+
−Event::GetPreventDefault() const
+
−{
+
−  nsCOMPtr<nsPIDOMWindowInner> win(do_QueryInterface(mOwner));
+
−  if (win) {
+
−    if (nsIDocument* doc = win->GetExtantDoc()) {
+
−      doc->WarnOnceAbout(nsIDocument::eGetPreventDefault);
+
−    }
+
−  }
+
−  // GetPreventDefault() is legacy and Gecko specific method.  Although,
+
−  // the result should be same as defaultPrevented, we don't need to break
+
−  // backward compatibility of legacy method.  Let's behave traditionally.
+
−  return DefaultPrevented();
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetPreventDefault(bool* aReturn)
+
−{
+
−  NS_ENSURE_ARG_POINTER(aReturn);
+
−  *aReturn = GetPreventDefault();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetDefaultPrevented(bool* aReturn)
+
−{
+
−  NS_ENSURE_ARG_POINTER(aReturn);
+
−  // This method must be called by only event handlers implemented by C++.
+
−  // Then, the handlers must handle default action.  So, this method don't need
+
−  // to check if preventDefault() has been called by content or chrome.
+
−  *aReturn = DefaultPrevented();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP_(void)
+
−Event::Serialize(IPC::Message* aMsg, bool aSerializeInterfaceType)
+
−{
+
−  if (aSerializeInterfaceType) {
+
−    IPC::WriteParam(aMsg, NS_LITERAL_STRING("event"));
+
−  }
+
−
+
−  nsString type;
+
−  GetType(type);
+
−  IPC::WriteParam(aMsg, type);
+
−
+
−  IPC::WriteParam(aMsg, Bubbles());
+
−  IPC::WriteParam(aMsg, Cancelable());
+
−  IPC::WriteParam(aMsg, IsTrusted());
+
−  IPC::WriteParam(aMsg, Composed());
+
−
+
−  // No timestamp serialization for now!
+
−}
+
−
+
−NS_IMETHODIMP_(bool)
+
−Event::Deserialize(const IPC::Message* aMsg, PickleIterator* aIter)
+
−{
+
−  nsString type;
+
−  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &type), false);
+
−
+
−  bool bubbles = false;
+
−  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &bubbles), false);
+
−
+
−  bool cancelable = false;
+
−  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &cancelable), false);
+
−
+
−  bool trusted = false;
+
−  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &trusted), false);
+
−
+
−  bool composed = false;
+
−  NS_ENSURE_TRUE(IPC::ReadParam(aMsg, aIter, &composed), false);
+
−
+
−  InitEvent(type, bubbles, cancelable);
+
−  SetTrusted(trusted);
+
−  SetComposed(composed);
+
−
+
−  return true;
+
−}
+
−
+
−NS_IMETHODIMP_(void)
+
−Event::SetOwner(EventTarget* aOwner)
+
−{
+
−  mOwner = nullptr;
+
−
+
−  if (!aOwner) {
+
−    return;
+
−  }
+
−
+
−  nsCOMPtr<nsINode> n = do_QueryInterface(aOwner);
+
−  if (n) {
+
−    mOwner = n->OwnerDoc()->GetScopeObject();
+
−    return;
+
−  }
+
−
+
−  nsCOMPtr<nsPIDOMWindowInner> w = do_QueryInterface(aOwner);
+
−  if (w) {
+
−    mOwner = do_QueryInterface(w);
+
−    return;
+
−  }
+
−
+
−  nsCOMPtr<DOMEventTargetHelper> eth = do_QueryInterface(aOwner);
+
−  if (eth) {
+
−    mOwner = eth->GetParentObject();
+
−    return;
+
−  }
+
−
+
−#ifdef DEBUG
+
−  nsCOMPtr<nsPIWindowRoot> root = do_QueryInterface(aOwner);
+
−  MOZ_ASSERT(root, "Unexpected EventTarget!");
+
−#endif
+
−}
+
−
+
−// static
+
−nsIContent*
+
−Event::GetShadowRelatedTarget(nsIContent* aCurrentTarget,
+
−                              nsIContent* aRelatedTarget)
+
−{
+
−  if (!aCurrentTarget || !aRelatedTarget) {
+
−    return nullptr;
+
−  }
+
−
+
−  // Walk up the ancestor node trees of the related target until
+
−  // we encounter the node tree of the current target in order
+
−  // to find the adjusted related target. Walking up the tree may
+
−  // not find a common ancestor node tree if the related target is in
+
−  // an ancestor tree, but in that case it does not need to be adjusted.
+
−  ShadowRoot* currentTargetShadow = aCurrentTarget->GetContainingShadow();
+
−  if (!currentTargetShadow) {
+
−    return nullptr;
+
−  }
+
−
+
−  nsIContent* relatedTarget = aCurrentTarget;
+
−  while (relatedTarget) {
+
−    ShadowRoot* ancestorShadow = relatedTarget->GetContainingShadow();
+
−    if (currentTargetShadow == ancestorShadow) {
+
−      return relatedTarget;
+
−    }
+
−
+
−    // Didn't find the ancestor tree, thus related target does not have to
+
−    // adjusted.
+
−    if (!ancestorShadow) {
+
−      return nullptr;
+
−    }
+
−
+
−    relatedTarget = ancestorShadow->GetHost();
+
−  }
+
−
+
−  return nullptr;
+
−}
+
−
+
−void
+
−Event::GetWidgetEventType(WidgetEvent* aEvent, nsAString& aType)
+
−{
+
−  if (!aEvent->mSpecifiedEventTypeString.IsEmpty()) {
+
−    aType = aEvent->mSpecifiedEventTypeString;
+
−    return;
+
−  }
+
−
+
−  const char* name = GetEventName(aEvent->mMessage);
+
−
+
−  if (name) {
+
−    CopyASCIItoUTF16(name, aType);
+
−    return;
+
−  } else if (aEvent->mMessage == eUnidentifiedEvent &&
+
−             aEvent->mSpecifiedEventType) {
+
−    // Remove "on"
+
−    aType = Substring(nsDependentAtomString(aEvent->mSpecifiedEventType), 2);
+
−    aEvent->mSpecifiedEventTypeString = aType;
+
−    return;
+
−  }
+
−
+
−  aType.Truncate();
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::GetCancelBubble(bool* aCancelBubble)
+
−{
+
−  NS_ENSURE_ARG_POINTER(aCancelBubble);
+
−  *aCancelBubble = CancelBubble();
+
−  return NS_OK;
+
−}
+
−
+
−NS_IMETHODIMP
+
−Event::SetCancelBubble(bool aCancelBubble)
+
−{
+
−  if (aCancelBubble) {
+
−    mEvent->StopPropagation();
+
−  }
+
−  return NS_OK;
+
−}
+
−
+
−} // namespace dom
+
−} // namespace mozilla
+
−
+
−using namespace mozilla;
+
−using namespace mozilla::dom;
+
−
+
−already_AddRefed<Event>
+
−NS_NewDOMEvent(EventTarget* aOwner,
+
−               nsPresContext* aPresContext,
+
−               WidgetEvent* aEvent) 
+
−{
+
−  RefPtr<Event> it = new Event(aOwner, aPresContext, aEvent);
+
−  return it.forget();
+
−}