Add m-esr52 at 52.6.0

1 files changed, 1305 insertions, 0 deletions

diff --git a/dom/events/Event.cpp b/dom/events/Event.cpp
new file mode 100644
index 000000000..a85a0d66b
--- /dev/null
+++ b/dom/events/Event.cpp
@@ -0,0 +1,1305 @@
+/* -*- 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 "WorkerPrivate.h"
+
+namespace mozilla {
+namespace dom {
+
+namespace workers {
+extern bool IsCurrentThreadRunningChromeWorker();
+} // namespace workers
+
+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_SCRIPT_OBJECTS
+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);
+}
+
+bool
+Event::IsChrome(JSContext* aCx) const
+{
+  return mIsMainThreadEvent ?
+    xpc::AccessCheck::isChrome(js::GetContextCompartment(aCx)) :
+    mozilla::dom::workers::IsCurrentThreadRunningChromeWorker();
+}
+
+// nsIDOMEventInterface
+NS_IMETHODIMP
+Event::GetType(nsAString& aType)
+{
+  if (!mIsMainThreadEvent || !mEvent->mSpecifiedEventTypeString.IsEmpty()) {
+    aType = mEvent->mSpecifiedEventTypeString;
+    return NS_OK;
+  }
+  const char* name = GetEventName(mEvent->mMessage);
+
+  if (name) {
+    CopyASCIItoUTF16(name, aType);
+    return NS_OK;
+  } else if (mEvent->mMessage == eUnidentifiedEvent &&
+             mEvent->mSpecifiedEventType) {
+    // Remove "on"
+    aType = Substring(nsDependentAtomString(mEvent->mSpecifiedEventType), 2);
+    mEvent->mSpecifiedEventTypeString = aType;
+    return NS_OK;
+  }
+
+  aType.Truncate();
+  return NS_OK;
+}
+
+static EventTarget*
+GetDOMEventTarget(nsIDOMEventTarget* aTarget)
+{
+  return aTarget ? aTarget->GetTargetForDOMEvent() : nullptr;
+}
+
+EventTarget*
+Event::GetTarget() const
+{
+  return GetDOMEventTarget(mEvent->mTarget);
+}
+
+NS_IMETHODIMP
+Event::GetTarget(nsIDOMEventTarget** aTarget)
+{
+  NS_IF_ADDREF(*aTarget = GetTarget());
+  return NS_OK;
+}
+
+EventTarget*
+Event::GetCurrentTarget() const
+{
+  return GetDOMEventTarget(mEvent->mCurrentTarget);
+}
+
+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
+{
+  if (mEvent->mOriginalTarget) {
+    return GetDOMEventTarget(mEvent->mOriginalTarget);
+  }
+
+  return GetTarget();
+}
+
+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 nsContentUtils::ThreadsafeIsCallerChrome();
+  }
+  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());
+  RefPtr<Event> e = new Event(t, nullptr, nullptr);
+  bool trusted = e->Init(t);
+  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)
+{
+  MOZ_ASSERT(aCx, "JS context must be specified");
+
+  // 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(IsChrome(aCx));
+}
+
+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();
+}
+
+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);
+
+  nsAFlatCString::const_iterator start, end;
+  nsAFlatCString::const_iterator startiter(events.BeginReading(start));
+  events.EndReading(end);
+
+  while (startiter != end) {
+    nsAFlatCString::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 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 (!nsContentUtils::LegacyIsCallerChromeOrNativeCode() &&
+      nsContentUtils::ResistFingerprinting()) {
+    // When resisting fingerprinting, return client coordinates instead.
+    return GetClientCoords(aPresContext, aEvent, aPoint, CSSIntPoint(0, 0));
+  }
+
+  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(Flush_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(JSContext* aCx) const
+{
+  MOZ_ASSERT(aCx, "JS context must be specified");
+
+  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() || IsChrome(aCx);
+}
+
+double
+Event::TimeStamp() 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);
+  }
+
+  // For dedicated workers, we should make times relative to the navigation
+  // start of the document that created the worker, which is the same as the
+  // timebase for performance.now().
+  workers::WorkerPrivate* workerPrivate =
+    workers::GetCurrentThreadWorkerPrivate();
+  MOZ_ASSERT(workerPrivate);
+
+  TimeDuration duration =
+    mEvent->mTimeStamp - workerPrivate->NowBaseTimeStamp();
+  return duration.ToMilliseconds();
+}
+
+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(mozilla::dom::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;
+}
+
+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();
+}