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gecko/dom/events/EventListenerManager.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
// Microsoft's API Name hackery sucks
#undef CreateEvent
#include "mozilla/AddonPathService.h"
#include "mozilla/BasicEvents.h"
#include "mozilla/CycleCollectedJSRuntime.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#ifdef MOZ_B2G
#include "mozilla/Hal.h"
#endif // #ifdef MOZ_B2G
#include "mozilla/HalSensor.h"
#include "mozilla/InternalMutationEvent.h"
#include "mozilla/JSEventHandler.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h"
#include "EventListenerService.h"
#include "nsCOMArray.h"
#include "nsCOMPtr.h"
#include "nsContentUtils.h"
#include "nsDocShell.h"
#include "nsDOMCID.h"
#include "nsError.h"
#include "nsGkAtoms.h"
#include "nsIContent.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIDocument.h"
#include "nsIDOMEventListener.h"
#include "nsIScriptGlobalObject.h"
#include "nsISupports.h"
#include "nsIXPConnect.h"
#include "nsJSUtils.h"
#include "nsNameSpaceManager.h"
#include "nsPIDOMWindow.h"
#include "nsSandboxFlags.h"
#include "xpcpublic.h"
namespace mozilla {
using namespace dom;
using namespace hal;
#define EVENT_TYPE_EQUALS(ls, type, userType, typeString, allEvents) \
((ls->mEventType == type && \
(ls->mEventType != NS_USER_DEFINED_EVENT || \
(mIsMainThreadELM && ls->mTypeAtom == userType) || \
(!mIsMainThreadELM && ls->mTypeString.Equals(typeString)))) || \
(allEvents && ls->mAllEvents))
static const uint32_t kAllMutationBits =
NS_EVENT_BITS_MUTATION_SUBTREEMODIFIED |
NS_EVENT_BITS_MUTATION_NODEINSERTED |
NS_EVENT_BITS_MUTATION_NODEREMOVED |
NS_EVENT_BITS_MUTATION_NODEREMOVEDFROMDOCUMENT |
NS_EVENT_BITS_MUTATION_NODEINSERTEDINTODOCUMENT |
NS_EVENT_BITS_MUTATION_ATTRMODIFIED |
NS_EVENT_BITS_MUTATION_CHARACTERDATAMODIFIED;
static uint32_t
MutationBitForEventType(uint32_t aEventType)
{
switch (aEventType) {
case NS_MUTATION_SUBTREEMODIFIED:
return NS_EVENT_BITS_MUTATION_SUBTREEMODIFIED;
case NS_MUTATION_NODEINSERTED:
return NS_EVENT_BITS_MUTATION_NODEINSERTED;
case NS_MUTATION_NODEREMOVED:
return NS_EVENT_BITS_MUTATION_NODEREMOVED;
case NS_MUTATION_NODEREMOVEDFROMDOCUMENT:
return NS_EVENT_BITS_MUTATION_NODEREMOVEDFROMDOCUMENT;
case NS_MUTATION_NODEINSERTEDINTODOCUMENT:
return NS_EVENT_BITS_MUTATION_NODEINSERTEDINTODOCUMENT;
case NS_MUTATION_ATTRMODIFIED:
return NS_EVENT_BITS_MUTATION_ATTRMODIFIED;
case NS_MUTATION_CHARACTERDATAMODIFIED:
return NS_EVENT_BITS_MUTATION_CHARACTERDATAMODIFIED;
default:
break;
}
return 0;
}
uint32_t EventListenerManager::sMainThreadCreatedCount = 0;
EventListenerManager::EventListenerManager(EventTarget* aTarget)
: mMayHavePaintEventListener(false)
, mMayHaveMutationListeners(false)
, mMayHaveCapturingListeners(false)
, mMayHaveSystemGroupListeners(false)
, mMayHaveTouchEventListener(false)
, mMayHaveMouseEnterLeaveEventListener(false)
, mMayHavePointerEnterLeaveEventListener(false)
, mClearingListeners(false)
, mIsMainThreadELM(NS_IsMainThread())
, mNoListenerForEvent(0)
, mTarget(aTarget)
{
NS_ASSERTION(aTarget, "unexpected null pointer");
if (mIsMainThreadELM) {
++sMainThreadCreatedCount;
}
}
EventListenerManager::~EventListenerManager()
{
// If your code fails this assertion, a possible reason is that
// a class did not call our Disconnect() manually. Note that
// this class can have Disconnect called in one of two ways:
// if it is part of a cycle, then in Unlink() (such a cycle
// would be with one of the listeners, not mTarget which is weak).
// If not part of a cycle, then Disconnect must be called manually,
// typically from the destructor of the owner class (mTarget).
// XXX azakai: Is there any reason to not just call Disconnect
// from right here, if not previously called?
NS_ASSERTION(!mTarget, "didn't call Disconnect");
RemoveAllListeners();
}
void
EventListenerManager::RemoveAllListeners()
{
if (mClearingListeners) {
return;
}
mClearingListeners = true;
mListeners.Clear();
mClearingListeners = false;
}
void
EventListenerManager::Shutdown()
{
Event::Shutdown();
}
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(EventListenerManager, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(EventListenerManager, Release)
inline void
ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback,
EventListenerManager::Listener& aField,
const char* aName,
unsigned aFlags)
{
if (MOZ_UNLIKELY(aCallback.WantDebugInfo())) {
nsAutoCString name;
name.AppendASCII(aName);
if (aField.mTypeAtom) {
name.AppendASCII(" event=");
name.Append(nsAtomCString(aField.mTypeAtom));
name.AppendASCII(" listenerType=");
name.AppendInt(aField.mListenerType);
name.AppendASCII(" ");
}
CycleCollectionNoteChild(aCallback, aField.mListener.GetISupports(), name.get(),
aFlags);
} else {
CycleCollectionNoteChild(aCallback, aField.mListener.GetISupports(), aName,
aFlags);
}
}
NS_IMPL_CYCLE_COLLECTION_CLASS(EventListenerManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(EventListenerManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mListeners)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(EventListenerManager)
tmp->Disconnect();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
nsPIDOMWindow*
EventListenerManager::GetInnerWindowForTarget()
{
nsCOMPtr<nsINode> node = do_QueryInterface(mTarget);
if (node) {
// XXX sXBL/XBL2 issue -- do we really want the owner here? What
// if that's the XBL document?
return node->OwnerDoc()->GetInnerWindow();
}
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
return window;
}
already_AddRefed<nsPIDOMWindow>
EventListenerManager::GetTargetAsInnerWindow() const
{
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(mTarget);
if (!window) {
return nullptr;
}
NS_ASSERTION(window->IsInnerWindow(), "Target should not be an outer window");
return window.forget();
}
void
EventListenerManager::AddEventListenerInternal(
const EventListenerHolder& aListenerHolder,
uint32_t aType,
nsIAtom* aTypeAtom,
const nsAString& aTypeString,
const EventListenerFlags& aFlags,
bool aHandler,
bool aAllEvents)
{
MOZ_ASSERT((NS_IsMainThread() && aType && aTypeAtom) || // Main thread
(!NS_IsMainThread() && aType && !aTypeString.IsEmpty()) || // non-main-thread
aAllEvents, "Missing type"); // all-events listener
if (!aListenerHolder || mClearingListeners) {
return;
}
// Since there is no public API to call us with an EventListenerHolder, we
// know that there's an EventListenerHolder on the stack holding a strong ref
// to the listener.
Listener* listener;
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; i++) {
listener = &mListeners.ElementAt(i);
// mListener == aListenerHolder is the last one, since it can be a bit slow.
if (listener->mListenerIsHandler == aHandler &&
listener->mFlags == aFlags &&
EVENT_TYPE_EQUALS(listener, aType, aTypeAtom, aTypeString,
aAllEvents) &&
listener->mListener == aListenerHolder) {
return;
}
}
mNoListenerForEvent = NS_EVENT_NULL;
mNoListenerForEventAtom = nullptr;
listener = aAllEvents ? mListeners.InsertElementAt(0) :
mListeners.AppendElement();
listener->mListener = aListenerHolder;
MOZ_ASSERT(aType < PR_UINT16_MAX);
listener->mEventType = aType;
listener->mTypeString = aTypeString;
listener->mTypeAtom = aTypeAtom;
listener->mFlags = aFlags;
listener->mListenerIsHandler = aHandler;
listener->mHandlerIsString = false;
listener->mAllEvents = aAllEvents;
// Detect the type of event listener.
nsCOMPtr<nsIXPConnectWrappedJS> wjs;
if (aFlags.mListenerIsJSListener) {
MOZ_ASSERT(!aListenerHolder.HasWebIDLCallback());
listener->mListenerType = Listener::eJSEventListener;
} else if (aListenerHolder.HasWebIDLCallback()) {
listener->mListenerType = Listener::eWebIDLListener;
} else if ((wjs = do_QueryInterface(aListenerHolder.GetXPCOMCallback()))) {
listener->mListenerType = Listener::eWrappedJSListener;
} else {
listener->mListenerType = Listener::eNativeListener;
}
if (aFlags.mInSystemGroup) {
mMayHaveSystemGroupListeners = true;
}
if (aFlags.mCapture) {
mMayHaveCapturingListeners = true;
}
if (aType == NS_AFTERPAINT) {
mMayHavePaintEventListener = true;
nsPIDOMWindow* window = GetInnerWindowForTarget();
if (window) {
window->SetHasPaintEventListeners();
}
} else if (aType >= NS_MUTATION_START && aType <= NS_MUTATION_END) {
// For mutation listeners, we need to update the global bit on the DOM window.
// Otherwise we won't actually fire the mutation event.
mMayHaveMutationListeners = true;
// Go from our target to the nearest enclosing DOM window.
nsPIDOMWindow* window = GetInnerWindowForTarget();
if (window) {
nsCOMPtr<nsIDocument> doc = window->GetExtantDoc();
if (doc) {
doc->WarnOnceAbout(nsIDocument::eMutationEvent);
}
// If aType is NS_MUTATION_SUBTREEMODIFIED, we need to listen all
// mutations. nsContentUtils::HasMutationListeners relies on this.
window->SetMutationListeners((aType == NS_MUTATION_SUBTREEMODIFIED) ?
kAllMutationBits :
MutationBitForEventType(aType));
}
} else if (aTypeAtom == nsGkAtoms::ondeviceorientation) {
EnableDevice(NS_DEVICE_ORIENTATION);
} else if (aTypeAtom == nsGkAtoms::ondeviceproximity || aTypeAtom == nsGkAtoms::onuserproximity) {
EnableDevice(NS_DEVICE_PROXIMITY);
} else if (aTypeAtom == nsGkAtoms::ondevicelight) {
EnableDevice(NS_DEVICE_LIGHT);
} else if (aTypeAtom == nsGkAtoms::ondevicemotion) {
EnableDevice(NS_DEVICE_MOTION);
#ifdef MOZ_B2G
} else if (aTypeAtom == nsGkAtoms::onmoztimechange) {
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
if (window) {
window->EnableTimeChangeNotifications();
}
} else if (aTypeAtom == nsGkAtoms::onmoznetworkupload) {
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
if (window) {
window->EnableNetworkEvent(NS_NETWORK_UPLOAD_EVENT);
}
} else if (aTypeAtom == nsGkAtoms::onmoznetworkdownload) {
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
if (window) {
window->EnableNetworkEvent(NS_NETWORK_DOWNLOAD_EVENT);
}
#endif // MOZ_B2G
} else if (aTypeAtom == nsGkAtoms::ontouchstart ||
aTypeAtom == nsGkAtoms::ontouchend ||
aTypeAtom == nsGkAtoms::ontouchmove ||
aTypeAtom == nsGkAtoms::ontouchcancel) {
mMayHaveTouchEventListener = true;
nsPIDOMWindow* window = GetInnerWindowForTarget();
// we don't want touchevent listeners added by scrollbars to flip this flag
// so we ignore listeners created with system event flag
if (window && !aFlags.mInSystemGroup) {
window->SetHasTouchEventListeners();
}
} else if (aType >= NS_POINTER_EVENT_START && aType <= NS_POINTER_LOST_CAPTURE) {
nsPIDOMWindow* window = GetInnerWindowForTarget();
if (aTypeAtom == nsGkAtoms::onpointerenter ||
aTypeAtom == nsGkAtoms::onpointerleave) {
mMayHavePointerEnterLeaveEventListener = true;
if (window) {
#ifdef DEBUG
nsCOMPtr<nsIDocument> d = window->GetExtantDoc();
NS_WARN_IF_FALSE(!nsContentUtils::IsChromeDoc(d),
"Please do not use pointerenter/leave events in chrome. "
"They are slower than pointerover/out!");
#endif
window->SetHasPointerEnterLeaveEventListeners();
}
}
} else if (aTypeAtom == nsGkAtoms::onmouseenter ||
aTypeAtom == nsGkAtoms::onmouseleave) {
mMayHaveMouseEnterLeaveEventListener = true;
nsPIDOMWindow* window = GetInnerWindowForTarget();
if (window) {
#ifdef DEBUG
nsCOMPtr<nsIDocument> d = window->GetExtantDoc();
NS_WARN_IF_FALSE(!nsContentUtils::IsChromeDoc(d),
"Please do not use mouseenter/leave events in chrome. "
"They are slower than mouseover/out!");
#endif
window->SetHasMouseEnterLeaveEventListeners();
}
#ifdef MOZ_GAMEPAD
} else if (aType >= NS_GAMEPAD_START &&
aType <= NS_GAMEPAD_END) {
nsPIDOMWindow* window = GetInnerWindowForTarget();
if (window) {
window->SetHasGamepadEventListener();
}
#endif
}
if (aTypeAtom && mTarget) {
mTarget->EventListenerAdded(aTypeAtom);
}
}
bool
EventListenerManager::IsDeviceType(uint32_t aType)
{
switch (aType) {
case NS_DEVICE_ORIENTATION:
case NS_DEVICE_MOTION:
case NS_DEVICE_LIGHT:
case NS_DEVICE_PROXIMITY:
case NS_USER_PROXIMITY:
return true;
default:
break;
}
return false;
}
void
EventListenerManager::EnableDevice(uint32_t aType)
{
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
if (!window) {
return;
}
switch (aType) {
case NS_DEVICE_ORIENTATION:
window->EnableDeviceSensor(SENSOR_ORIENTATION);
break;
case NS_DEVICE_PROXIMITY:
case NS_USER_PROXIMITY:
window->EnableDeviceSensor(SENSOR_PROXIMITY);
break;
case NS_DEVICE_LIGHT:
window->EnableDeviceSensor(SENSOR_LIGHT);
break;
case NS_DEVICE_MOTION:
window->EnableDeviceSensor(SENSOR_ACCELERATION);
window->EnableDeviceSensor(SENSOR_LINEAR_ACCELERATION);
window->EnableDeviceSensor(SENSOR_GYROSCOPE);
break;
default:
NS_WARNING("Enabling an unknown device sensor.");
break;
}
}
void
EventListenerManager::DisableDevice(uint32_t aType)
{
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
if (!window) {
return;
}
switch (aType) {
case NS_DEVICE_ORIENTATION:
window->DisableDeviceSensor(SENSOR_ORIENTATION);
break;
case NS_DEVICE_MOTION:
window->DisableDeviceSensor(SENSOR_ACCELERATION);
window->DisableDeviceSensor(SENSOR_LINEAR_ACCELERATION);
window->DisableDeviceSensor(SENSOR_GYROSCOPE);
break;
case NS_DEVICE_PROXIMITY:
case NS_USER_PROXIMITY:
window->DisableDeviceSensor(SENSOR_PROXIMITY);
break;
case NS_DEVICE_LIGHT:
window->DisableDeviceSensor(SENSOR_LIGHT);
break;
default:
NS_WARNING("Disabling an unknown device sensor.");
break;
}
}
void
EventListenerManager::RemoveEventListenerInternal(
const EventListenerHolder& aListenerHolder,
uint32_t aType,
nsIAtom* aUserType,
const nsAString& aTypeString,
const EventListenerFlags& aFlags,
bool aAllEvents)
{
if (!aListenerHolder || !aType || mClearingListeners) {
return;
}
Listener* listener;
uint32_t count = mListeners.Length();
uint32_t typeCount = 0;
bool deviceType = IsDeviceType(aType);
#ifdef MOZ_B2G
bool timeChangeEvent = (aType == NS_MOZ_TIME_CHANGE_EVENT);
bool networkEvent = (aType == NS_NETWORK_UPLOAD_EVENT ||
aType == NS_NETWORK_DOWNLOAD_EVENT);
#endif // MOZ_B2G
for (uint32_t i = 0; i < count; ++i) {
listener = &mListeners.ElementAt(i);
if (EVENT_TYPE_EQUALS(listener, aType, aUserType, aTypeString,
aAllEvents)) {
++typeCount;
if (listener->mListener == aListenerHolder &&
listener->mFlags.EqualsIgnoringTrustness(aFlags)) {
nsRefPtr<EventListenerManager> kungFuDeathGrip(this);
mListeners.RemoveElementAt(i);
--count;
mNoListenerForEvent = NS_EVENT_NULL;
mNoListenerForEventAtom = nullptr;
if (mTarget && aUserType) {
mTarget->EventListenerRemoved(aUserType);
}
if (!deviceType
#ifdef MOZ_B2G
&& !timeChangeEvent && !networkEvent
#endif // MOZ_B2G
) {
return;
}
--typeCount;
}
}
}
if (!aAllEvents && deviceType && typeCount == 0) {
DisableDevice(aType);
#ifdef MOZ_B2G
} else if (timeChangeEvent && typeCount == 0) {
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
if (window) {
window->DisableTimeChangeNotifications();
}
} else if (!aAllEvents && networkEvent && typeCount == 0) {
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
if (window) {
window->DisableNetworkEvent(aType);
}
#endif // MOZ_B2G
}
}
bool
EventListenerManager::ListenerCanHandle(Listener* aListener,
WidgetEvent* aEvent)
{
// This is slightly different from EVENT_TYPE_EQUALS in that it returns
// true even when aEvent->message == NS_USER_DEFINED_EVENT and
// aListener=>mEventType != NS_USER_DEFINED_EVENT as long as the atoms are
// the same
if (aListener->mAllEvents) {
return true;
}
if (aEvent->message == NS_USER_DEFINED_EVENT) {
if (mIsMainThreadELM) {
return aListener->mTypeAtom == aEvent->userType;
}
return aListener->mTypeString.Equals(aEvent->typeString);
}
MOZ_ASSERT(mIsMainThreadELM);
return aListener->mEventType == aEvent->message;
}
void
EventListenerManager::AddEventListenerByType(
const EventListenerHolder& aListenerHolder,
const nsAString& aType,
const EventListenerFlags& aFlags)
{
nsCOMPtr<nsIAtom> atom =
mIsMainThreadELM ? do_GetAtom(NS_LITERAL_STRING("on") + aType) : nullptr;
uint32_t type = nsContentUtils::GetEventId(atom);
AddEventListenerInternal(aListenerHolder, type, atom, aType, aFlags);
}
void
EventListenerManager::RemoveEventListenerByType(
const EventListenerHolder& aListenerHolder,
const nsAString& aType,
const EventListenerFlags& aFlags)
{
nsCOMPtr<nsIAtom> atom =
mIsMainThreadELM ? do_GetAtom(NS_LITERAL_STRING("on") + aType) : nullptr;
uint32_t type = nsContentUtils::GetEventId(atom);
RemoveEventListenerInternal(aListenerHolder, type, atom, aType, aFlags);
}
EventListenerManager::Listener*
EventListenerManager::FindEventHandler(uint32_t aEventType,
nsIAtom* aTypeAtom,
const nsAString& aTypeString)
{
// Run through the listeners for this type and see if a script
// listener is registered
Listener* listener;
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
listener = &mListeners.ElementAt(i);
if (listener->mListenerIsHandler &&
EVENT_TYPE_EQUALS(listener, aEventType, aTypeAtom, aTypeString,
false)) {
return listener;
}
}
return nullptr;
}
EventListenerManager::Listener*
EventListenerManager::SetEventHandlerInternal(
nsIAtom* aName,
const nsAString& aTypeString,
const TypedEventHandler& aTypedHandler,
bool aPermitUntrustedEvents)
{
MOZ_ASSERT(aName || !aTypeString.IsEmpty());
uint32_t eventType = nsContentUtils::GetEventId(aName);
Listener* listener = FindEventHandler(eventType, aName, aTypeString);
if (!listener) {
// If we didn't find a script listener or no listeners existed
// create and add a new one.
EventListenerFlags flags;
flags.mListenerIsJSListener = true;
nsCOMPtr<JSEventHandler> jsEventHandler;
NS_NewJSEventHandler(mTarget, aName,
aTypedHandler, getter_AddRefs(jsEventHandler));
EventListenerHolder listenerHolder(jsEventHandler);
AddEventListenerInternal(listenerHolder, eventType, aName, aTypeString,
flags, true);
listener = FindEventHandler(eventType, aName, aTypeString);
} else {
JSEventHandler* jsEventHandler = listener->GetJSEventHandler();
MOZ_ASSERT(jsEventHandler,
"How can we have an event handler with no JSEventHandler?");
bool same = jsEventHandler->GetTypedEventHandler() == aTypedHandler;
// Possibly the same listener, but update still the context and scope.
jsEventHandler->SetHandler(aTypedHandler);
if (mTarget && !same && aName) {
mTarget->EventListenerRemoved(aName);
mTarget->EventListenerAdded(aName);
}
}
// Set flag to indicate possible need for compilation later
listener->mHandlerIsString = !aTypedHandler.HasEventHandler();
if (aPermitUntrustedEvents) {
listener->mFlags.mAllowUntrustedEvents = true;
}
return listener;
}
nsresult
EventListenerManager::SetEventHandler(nsIAtom* aName,
const nsAString& aBody,
bool aDeferCompilation,
bool aPermitUntrustedEvents,
Element* aElement)
{
nsCOMPtr<nsIDocument> doc;
nsCOMPtr<nsIScriptGlobalObject> global =
GetScriptGlobalAndDocument(getter_AddRefs(doc));
if (!global) {
// This can happen; for example this document might have been
// loaded as data.
return NS_OK;
}
#ifdef DEBUG
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(global);
if (win) {
MOZ_ASSERT(win->IsInnerWindow(), "We should not have an outer window here!");
}
#endif
nsresult rv = NS_OK;
// return early preventing the event listener from being added
// 'doc' is fetched above
if (doc) {
// Don't allow adding an event listener if the document is sandboxed
// without 'allow-scripts'.
if (doc->GetSandboxFlags() & SANDBOXED_SCRIPTS) {
return NS_ERROR_DOM_SECURITY_ERR;
}
nsCOMPtr<nsIContentSecurityPolicy> csp;
rv = doc->NodePrincipal()->GetCsp(getter_AddRefs(csp));
NS_ENSURE_SUCCESS(rv, rv);
if (csp) {
bool inlineOK = true;
bool reportViolations = false;
rv = csp->GetAllowsInlineScript(&reportViolations, &inlineOK);
NS_ENSURE_SUCCESS(rv, rv);
if (reportViolations) {
// gather information to log with violation report
nsIURI* uri = doc->GetDocumentURI();
nsAutoCString asciiSpec;
if (uri)
uri->GetAsciiSpec(asciiSpec);
nsAutoString scriptSample, attr, tagName(NS_LITERAL_STRING("UNKNOWN"));
aName->ToString(attr);
nsCOMPtr<nsIDOMNode> domNode(do_QueryInterface(mTarget));
if (domNode)
domNode->GetNodeName(tagName);
// build a "script sample" based on what we know about this element
scriptSample.Assign(attr);
scriptSample.AppendLiteral(" attribute on ");
scriptSample.Append(tagName);
scriptSample.AppendLiteral(" element");
csp->LogViolationDetails(nsIContentSecurityPolicy::VIOLATION_TYPE_INLINE_SCRIPT,
NS_ConvertUTF8toUTF16(asciiSpec),
scriptSample,
0,
EmptyString(),
EmptyString());
}
// return early if CSP wants us to block inline scripts
if (!inlineOK) {
return NS_OK;
}
}
}
// This might be the first reference to this language in the global
// We must init the language before we attempt to fetch its context.
if (NS_FAILED(global->EnsureScriptEnvironment())) {
NS_WARNING("Failed to setup script environment for this language");
// but fall through and let the inevitable failure below handle it.
}
nsIScriptContext* context = global->GetScriptContext();
NS_ENSURE_TRUE(context, NS_ERROR_FAILURE);
NS_ENSURE_STATE(global->GetGlobalJSObject());
Listener* listener = SetEventHandlerInternal(aName,
EmptyString(),
TypedEventHandler(),
aPermitUntrustedEvents);
if (!aDeferCompilation) {
return CompileEventHandlerInternal(listener, &aBody, aElement);
}
return NS_OK;
}
void
EventListenerManager::RemoveEventHandler(nsIAtom* aName,
const nsAString& aTypeString)
{
if (mClearingListeners) {
return;
}
uint32_t eventType = nsContentUtils::GetEventId(aName);
Listener* listener = FindEventHandler(eventType, aName, aTypeString);
if (listener) {
mListeners.RemoveElementAt(uint32_t(listener - &mListeners.ElementAt(0)));
mNoListenerForEvent = NS_EVENT_NULL;
mNoListenerForEventAtom = nullptr;
if (mTarget && aName) {
mTarget->EventListenerRemoved(aName);
}
}
}
nsresult
EventListenerManager::CompileEventHandlerInternal(Listener* aListener,
const nsAString* aBody,
Element* aElement)
{
MOZ_ASSERT(aListener->GetJSEventHandler());
MOZ_ASSERT(aListener->mHandlerIsString, "Why are we compiling a non-string JS listener?");
JSEventHandler* jsEventHandler = aListener->GetJSEventHandler();
MOZ_ASSERT(!jsEventHandler->GetTypedEventHandler().HasEventHandler(),
"What is there to compile?");
nsresult result = NS_OK;
nsCOMPtr<nsIDocument> doc;
nsCOMPtr<nsIScriptGlobalObject> global =
GetScriptGlobalAndDocument(getter_AddRefs(doc));
NS_ENSURE_STATE(global);
// Activate JSAPI, and make sure that exceptions are reported on the right
// Window.
AutoJSAPI jsapi;
if (NS_WARN_IF(!jsapi.Init(global))) {
return NS_ERROR_UNEXPECTED;
}
jsapi.TakeOwnershipOfErrorReporting();
JSContext* cx = jsapi.cx();
nsCOMPtr<nsIAtom> typeAtom = aListener->mTypeAtom;
nsIAtom* attrName = typeAtom;
// Flag us as not a string so we don't keep trying to compile strings which
// can't be compiled.
aListener->mHandlerIsString = false;
// mTarget may not be an Element if it's a window and we're
// getting an inline event listener forwarded from <html:body> or
// <html:frameset> or <xul:window> or the like.
// XXX I don't like that we have to reference content from
// here. The alternative is to store the event handler string on
// the JSEventHandler itself, and that still doesn't address
// the arg names issue.
nsCOMPtr<Element> element = do_QueryInterface(mTarget);
MOZ_ASSERT(element || aBody, "Where will we get our body?");
nsAutoString handlerBody;
const nsAString* body = aBody;
if (!aBody) {
if (aListener->mTypeAtom == nsGkAtoms::onSVGLoad) {
attrName = nsGkAtoms::onload;
} else if (aListener->mTypeAtom == nsGkAtoms::onSVGUnload) {
attrName = nsGkAtoms::onunload;
} else if (aListener->mTypeAtom == nsGkAtoms::onSVGResize) {
attrName = nsGkAtoms::onresize;
} else if (aListener->mTypeAtom == nsGkAtoms::onSVGScroll) {
attrName = nsGkAtoms::onscroll;
} else if (aListener->mTypeAtom == nsGkAtoms::onSVGZoom) {
attrName = nsGkAtoms::onzoom;
} else if (aListener->mTypeAtom == nsGkAtoms::onbeginEvent) {
attrName = nsGkAtoms::onbegin;
} else if (aListener->mTypeAtom == nsGkAtoms::onrepeatEvent) {
attrName = nsGkAtoms::onrepeat;
} else if (aListener->mTypeAtom == nsGkAtoms::onendEvent) {
attrName = nsGkAtoms::onend;
}
element->GetAttr(kNameSpaceID_None, attrName, handlerBody);
body = &handlerBody;
aElement = element;
}
aListener = nullptr;
uint32_t lineNo = 0;
nsAutoCString url (NS_LITERAL_CSTRING("-moz-evil:lying-event-listener"));
MOZ_ASSERT(body);
MOZ_ASSERT(aElement);
nsIURI *uri = aElement->OwnerDoc()->GetDocumentURI();
if (uri) {
uri->GetSpec(url);
lineNo = 1;
}
nsCOMPtr<nsPIDOMWindow> win = do_QueryInterface(mTarget);
uint32_t argCount;
const char **argNames;
nsContentUtils::GetEventArgNames(aElement->GetNameSpaceID(),
typeAtom, win,
&argCount, &argNames);
JSAddonId *addonId = MapURIToAddonID(uri);
// Wrap the event target, so that we can use it as the scope for the event
// handler. Note that mTarget is different from aElement in the <body> case,
// where mTarget is a Window.
//
// The wrapScope doesn't really matter here, because the target will create
// its reflector in the proper scope, and then we'll enter that compartment.
JS::Rooted<JSObject*> wrapScope(cx, global->GetGlobalJSObject());
JS::Rooted<JS::Value> v(cx);
{
JSAutoCompartment ac(cx, wrapScope);
nsresult rv = nsContentUtils::WrapNative(cx, mTarget, &v,
/* aAllowWrapping = */ false);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
}
if (addonId) {
JS::Rooted<JSObject*> vObj(cx, &v.toObject());
JS::Rooted<JSObject*> addonScope(cx, xpc::GetAddonScope(cx, vObj, addonId));
if (!addonScope) {
return NS_ERROR_FAILURE;
}
JSAutoCompartment ac(cx, addonScope);
// Wrap our event target into the addon scope, since that's where we want to
// do all our work.
if (!JS_WrapValue(cx, &v)) {
return NS_ERROR_FAILURE;
}
}
JS::Rooted<JSObject*> target(cx, &v.toObject());
JSAutoCompartment ac(cx, target);
// Now that we've entered the compartment we actually care about, create our
// scope chain. Note that we start with |element|, not aElement, because
// mTarget is different from aElement in the <body> case, where mTarget is a
// Window, and in that case we do not want the scope chain to include the body
// or the document.
JS::AutoObjectVector scopeChain(cx);
if (!nsJSUtils::GetScopeChainForElement(cx, element, scopeChain)) {
return NS_ERROR_OUT_OF_MEMORY;
}
nsDependentAtomString str(attrName);
// Most of our names are short enough that we don't even have to malloc
// the JS string stuff, so don't worry about playing games with
// refcounting XPCOM stringbuffers.
JS::Rooted<JSString*> jsStr(cx, JS_NewUCStringCopyN(cx,
str.BeginReading(),
str.Length()));
NS_ENSURE_TRUE(jsStr, NS_ERROR_OUT_OF_MEMORY);
// Get the reflector for |aElement|, so that we can pass to setElement.
if (NS_WARN_IF(!WrapNewBindingObject(cx, target, aElement, &v))) {
return NS_ERROR_FAILURE;
}
JS::CompileOptions options(cx);
options.setIntroductionType("eventHandler")
.setFileAndLine(url.get(), lineNo)
.setVersion(JSVERSION_DEFAULT)
.setElement(&v.toObject())
.setElementAttributeName(jsStr);
JS::Rooted<JSObject*> handler(cx);
result = nsJSUtils::CompileFunction(jsapi, scopeChain, options,
nsAtomCString(typeAtom),
argCount, argNames, *body, handler.address());
NS_ENSURE_SUCCESS(result, result);
NS_ENSURE_TRUE(handler, NS_ERROR_FAILURE);
if (jsEventHandler->EventName() == nsGkAtoms::onerror && win) {
nsRefPtr<OnErrorEventHandlerNonNull> handlerCallback =
new OnErrorEventHandlerNonNull(handler, /* aIncumbentGlobal = */ nullptr);
jsEventHandler->SetHandler(handlerCallback);
} else if (jsEventHandler->EventName() == nsGkAtoms::onbeforeunload && win) {
nsRefPtr<OnBeforeUnloadEventHandlerNonNull> handlerCallback =
new OnBeforeUnloadEventHandlerNonNull(handler, /* aIncumbentGlobal = */ nullptr);
jsEventHandler->SetHandler(handlerCallback);
} else {
nsRefPtr<EventHandlerNonNull> handlerCallback =
new EventHandlerNonNull(handler, /* aIncumbentGlobal = */ nullptr);
jsEventHandler->SetHandler(handlerCallback);
}
return result;
}
nsresult
EventListenerManager::HandleEventSubType(Listener* aListener,
nsIDOMEvent* aDOMEvent,
EventTarget* aCurrentTarget)
{
nsresult result = NS_OK;
EventListenerHolder listenerHolder(aListener->mListener); // strong ref
// If this is a script handler and we haven't yet
// compiled the event handler itself
if ((aListener->mListenerType == Listener::eJSEventListener) &&
aListener->mHandlerIsString) {
result = CompileEventHandlerInternal(aListener, nullptr, nullptr);
aListener = nullptr;
}
if (NS_SUCCEEDED(result)) {
if (mIsMainThreadELM) {
nsContentUtils::EnterMicroTask();
}
// nsIDOMEvent::currentTarget is set in EventDispatcher.
if (listenerHolder.HasWebIDLCallback()) {
ErrorResult rv;
listenerHolder.GetWebIDLCallback()->
HandleEvent(aCurrentTarget, *(aDOMEvent->InternalDOMEvent()), rv);
result = rv.ErrorCode();
} else {
result = listenerHolder.GetXPCOMCallback()->HandleEvent(aDOMEvent);
}
if (mIsMainThreadELM) {
nsContentUtils::LeaveMicroTask();
}
}
return result;
}
nsIDocShell*
EventListenerManager::GetDocShellForTarget()
{
nsCOMPtr<nsINode> node(do_QueryInterface(mTarget));
nsIDocument* doc = nullptr;
nsIDocShell* docShell = nullptr;
if (node) {
doc = node->OwnerDoc();
if (!doc->GetDocShell()) {
bool ignore;
nsCOMPtr<nsPIDOMWindow> window =
do_QueryInterface(doc->GetScriptHandlingObject(ignore));
if (window) {
doc = window->GetExtantDoc();
}
}
} else {
nsCOMPtr<nsPIDOMWindow> window = GetTargetAsInnerWindow();
if (window) {
doc = window->GetExtantDoc();
}
}
if (!doc) {
nsCOMPtr<DOMEventTargetHelper> helper(do_QueryInterface(mTarget));
if (helper) {
nsPIDOMWindow* window = helper->GetOwner();
if (window) {
doc = window->GetExtantDoc();
}
}
}
if (doc) {
docShell = doc->GetDocShell();
}
return docShell;
}
/**
* Causes a check for event listeners and processing by them if they exist.
* @param an event listener
*/
void
EventListenerManager::HandleEventInternal(nsPresContext* aPresContext,
WidgetEvent* aEvent,
nsIDOMEvent** aDOMEvent,
EventTarget* aCurrentTarget,
nsEventStatus* aEventStatus)
{
//Set the value of the internal PreventDefault flag properly based on aEventStatus
if (*aEventStatus == nsEventStatus_eConsumeNoDefault) {
aEvent->mFlags.mDefaultPrevented = true;
}
nsAutoTObserverArray<Listener, 2>::EndLimitedIterator iter(mListeners);
Maybe<nsAutoPopupStatePusher> popupStatePusher;
if (mIsMainThreadELM) {
popupStatePusher.emplace(Event::GetEventPopupControlState(aEvent, *aDOMEvent));
}
bool hasListener = false;
while (iter.HasMore()) {
if (aEvent->mFlags.mImmediatePropagationStopped) {
break;
}
Listener* listener = &iter.GetNext();
// Check that the phase is same in event and event listener.
// Handle only trusted events, except when listener permits untrusted events.
if (ListenerCanHandle(listener, aEvent)) {
hasListener = true;
if (listener->IsListening(aEvent) &&
(aEvent->mFlags.mIsTrusted ||
listener->mFlags.mAllowUntrustedEvents)) {
if (!*aDOMEvent) {
// This is tiny bit slow, but happens only once per event.
nsCOMPtr<EventTarget> et =
do_QueryInterface(aEvent->originalTarget);
EventDispatcher::CreateEvent(et, aPresContext,
aEvent, EmptyString(), aDOMEvent);
}
if (*aDOMEvent) {
if (!aEvent->currentTarget) {
aEvent->currentTarget = aCurrentTarget->GetTargetForDOMEvent();
if (!aEvent->currentTarget) {
break;
}
}
// Maybe add a marker to the docshell's timeline, but only
// bother with all the logic if some docshell is recording.
nsCOMPtr<nsIDocShell> docShell;
if (mIsMainThreadELM &&
nsDocShell::gProfileTimelineRecordingsCount > 0 &&
listener->mListenerType != Listener::eNativeListener) {
docShell = GetDocShellForTarget();
if (docShell) {
nsDocShell* ds = static_cast<nsDocShell*>(docShell.get());
ds->AddProfileTimelineMarker("DOMEvent", TRACING_INTERVAL_START);
}
}
if (NS_FAILED(HandleEventSubType(listener, *aDOMEvent,
aCurrentTarget))) {
aEvent->mFlags.mExceptionHasBeenRisen = true;
}
if (docShell) {
nsDocShell* ds = static_cast<nsDocShell*>(docShell.get());
ds->AddProfileTimelineMarker("DOMEvent", TRACING_INTERVAL_END);
}
}
}
}
}
aEvent->currentTarget = nullptr;
if (mIsMainThreadELM && !hasListener) {
mNoListenerForEvent = aEvent->message;
mNoListenerForEventAtom = aEvent->userType;
}
if (aEvent->mFlags.mDefaultPrevented) {
*aEventStatus = nsEventStatus_eConsumeNoDefault;
}
}
void
EventListenerManager::Disconnect()
{
mTarget = nullptr;
RemoveAllListeners();
}
void
EventListenerManager::AddEventListener(
const nsAString& aType,
const EventListenerHolder& aListenerHolder,
bool aUseCapture,
bool aWantsUntrusted)
{
EventListenerFlags flags;
flags.mCapture = aUseCapture;
flags.mAllowUntrustedEvents = aWantsUntrusted;
return AddEventListenerByType(aListenerHolder, aType, flags);
}
void
EventListenerManager::RemoveEventListener(
const nsAString& aType,
const EventListenerHolder& aListenerHolder,
bool aUseCapture)
{
EventListenerFlags flags;
flags.mCapture = aUseCapture;
RemoveEventListenerByType(aListenerHolder, aType, flags);
}
void
EventListenerManager::AddListenerForAllEvents(nsIDOMEventListener* aDOMListener,
bool aUseCapture,
bool aWantsUntrusted,
bool aSystemEventGroup)
{
EventListenerFlags flags;
flags.mCapture = aUseCapture;
flags.mAllowUntrustedEvents = aWantsUntrusted;
flags.mInSystemGroup = aSystemEventGroup;
EventListenerHolder listenerHolder(aDOMListener);
AddEventListenerInternal(listenerHolder, NS_EVENT_ALL, nullptr, EmptyString(),
flags, false, true);
}
void
EventListenerManager::RemoveListenerForAllEvents(
nsIDOMEventListener* aDOMListener,
bool aUseCapture,
bool aSystemEventGroup)
{
EventListenerFlags flags;
flags.mCapture = aUseCapture;
flags.mInSystemGroup = aSystemEventGroup;
EventListenerHolder listenerHolder(aDOMListener);
RemoveEventListenerInternal(listenerHolder, NS_EVENT_ALL, nullptr,
EmptyString(), flags, true);
}
bool
EventListenerManager::HasMutationListeners()
{
if (mMayHaveMutationListeners) {
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
Listener* listener = &mListeners.ElementAt(i);
if (listener->mEventType >= NS_MUTATION_START &&
listener->mEventType <= NS_MUTATION_END) {
return true;
}
}
}
return false;
}
uint32_t
EventListenerManager::MutationListenerBits()
{
uint32_t bits = 0;
if (mMayHaveMutationListeners) {
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
Listener* listener = &mListeners.ElementAt(i);
if (listener->mEventType >= NS_MUTATION_START &&
listener->mEventType <= NS_MUTATION_END) {
if (listener->mEventType == NS_MUTATION_SUBTREEMODIFIED) {
return kAllMutationBits;
}
bits |= MutationBitForEventType(listener->mEventType);
}
}
}
return bits;
}
bool
EventListenerManager::HasListenersFor(const nsAString& aEventName)
{
nsCOMPtr<nsIAtom> atom = do_GetAtom(NS_LITERAL_STRING("on") + aEventName);
return HasListenersFor(atom);
}
bool
EventListenerManager::HasListenersFor(nsIAtom* aEventNameWithOn)
{
#ifdef DEBUG
nsAutoString name;
aEventNameWithOn->ToString(name);
#endif
NS_ASSERTION(StringBeginsWith(name, NS_LITERAL_STRING("on")),
"Event name does not start with 'on'");
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
Listener* listener = &mListeners.ElementAt(i);
if (listener->mTypeAtom == aEventNameWithOn) {
return true;
}
}
return false;
}
bool
EventListenerManager::HasListeners()
{
return !mListeners.IsEmpty();
}
nsresult
EventListenerManager::GetListenerInfo(nsCOMArray<nsIEventListenerInfo>* aList)
{
nsCOMPtr<EventTarget> target = do_QueryInterface(mTarget);
NS_ENSURE_STATE(target);
aList->Clear();
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
const Listener& listener = mListeners.ElementAt(i);
// If this is a script handler and we haven't yet
// compiled the event handler itself go ahead and compile it
if (listener.mListenerType == Listener::eJSEventListener &&
listener.mHandlerIsString) {
CompileEventHandlerInternal(const_cast<Listener*>(&listener), nullptr,
nullptr);
}
nsAutoString eventType;
if (listener.mAllEvents) {
eventType.SetIsVoid(true);
} else {
eventType.Assign(Substring(nsDependentAtomString(listener.mTypeAtom), 2));
}
// EventListenerInfo is defined in XPCOM, so we have to go ahead
// and convert to an XPCOM callback here...
nsRefPtr<EventListenerInfo> info =
new EventListenerInfo(eventType, listener.mListener.ToXPCOMCallback(),
listener.mFlags.mCapture,
listener.mFlags.mAllowUntrustedEvents,
listener.mFlags.mInSystemGroup);
aList->AppendObject(info);
}
return NS_OK;
}
bool
EventListenerManager::HasUnloadListeners()
{
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
Listener* listener = &mListeners.ElementAt(i);
if (listener->mEventType == NS_PAGE_UNLOAD ||
listener->mEventType == NS_BEFORE_PAGE_UNLOAD) {
return true;
}
}
return false;
}
void
EventListenerManager::SetEventHandler(nsIAtom* aEventName,
const nsAString& aTypeString,
EventHandlerNonNull* aHandler)
{
if (!aHandler) {
RemoveEventHandler(aEventName, aTypeString);
return;
}
// Untrusted events are always permitted for non-chrome script
// handlers.
SetEventHandlerInternal(aEventName, aTypeString, TypedEventHandler(aHandler),
!mIsMainThreadELM ||
!nsContentUtils::IsCallerChrome());
}
void
EventListenerManager::SetEventHandler(OnErrorEventHandlerNonNull* aHandler)
{
if (mIsMainThreadELM) {
if (!aHandler) {
RemoveEventHandler(nsGkAtoms::onerror, EmptyString());
return;
}
// Untrusted events are always permitted for non-chrome script
// handlers.
SetEventHandlerInternal(nsGkAtoms::onerror, EmptyString(),
TypedEventHandler(aHandler),
!nsContentUtils::IsCallerChrome());
} else {
if (!aHandler) {
RemoveEventHandler(nullptr, NS_LITERAL_STRING("error"));
return;
}
// Untrusted events are always permitted.
SetEventHandlerInternal(nullptr, NS_LITERAL_STRING("error"),
TypedEventHandler(aHandler), true);
}
}
void
EventListenerManager::SetEventHandler(
OnBeforeUnloadEventHandlerNonNull* aHandler)
{
if (!aHandler) {
RemoveEventHandler(nsGkAtoms::onbeforeunload, EmptyString());
return;
}
// Untrusted events are always permitted for non-chrome script
// handlers.
SetEventHandlerInternal(nsGkAtoms::onbeforeunload, EmptyString(),
TypedEventHandler(aHandler),
!mIsMainThreadELM ||
!nsContentUtils::IsCallerChrome());
}
const TypedEventHandler*
EventListenerManager::GetTypedEventHandler(nsIAtom* aEventName,
const nsAString& aTypeString)
{
uint32_t eventType = nsContentUtils::GetEventId(aEventName);
Listener* listener = FindEventHandler(eventType, aEventName, aTypeString);
if (!listener) {
return nullptr;
}
JSEventHandler* jsEventHandler = listener->GetJSEventHandler();
if (listener->mHandlerIsString) {
CompileEventHandlerInternal(listener, nullptr, nullptr);
}
const TypedEventHandler& typedHandler =
jsEventHandler->GetTypedEventHandler();
return typedHandler.HasEventHandler() ? &typedHandler : nullptr;
}
size_t
EventListenerManager::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
n += mListeners.SizeOfExcludingThis(aMallocSizeOf);
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
JSEventHandler* jsEventHandler =
mListeners.ElementAt(i).GetJSEventHandler();
if (jsEventHandler) {
n += jsEventHandler->SizeOfIncludingThis(aMallocSizeOf);
}
}
return n;
}
void
EventListenerManager::MarkForCC()
{
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
const Listener& listener = mListeners.ElementAt(i);
JSEventHandler* jsEventHandler = listener.GetJSEventHandler();
if (jsEventHandler) {
const TypedEventHandler& typedHandler =
jsEventHandler->GetTypedEventHandler();
if (typedHandler.HasEventHandler()) {
JS::ExposeObjectToActiveJS(typedHandler.Ptr()->Callable());
}
} else if (listener.mListenerType == Listener::eWrappedJSListener) {
xpc_TryUnmarkWrappedGrayObject(listener.mListener.GetXPCOMCallback());
} else if (listener.mListenerType == Listener::eWebIDLListener) {
// Callback() unmarks gray
listener.mListener.GetWebIDLCallback()->Callback();
}
}
if (mRefCnt.IsPurple()) {
mRefCnt.RemovePurple();
}
}
void
EventListenerManager::TraceListeners(JSTracer* aTrc)
{
uint32_t count = mListeners.Length();
for (uint32_t i = 0; i < count; ++i) {
const Listener& listener = mListeners.ElementAt(i);
JSEventHandler* jsEventHandler = listener.GetJSEventHandler();
if (jsEventHandler) {
const TypedEventHandler& typedHandler =
jsEventHandler->GetTypedEventHandler();
if (typedHandler.HasEventHandler()) {
mozilla::TraceScriptHolder(typedHandler.Ptr(), aTrc);
}
} else if (listener.mListenerType == Listener::eWebIDLListener) {
mozilla::TraceScriptHolder(listener.mListener.GetWebIDLCallback(), aTrc);
}
// We might have eWrappedJSListener, but that is the legacy type for
// JS implemented event listeners, and trickier to handle here.
}
}
already_AddRefed<nsIScriptGlobalObject>
EventListenerManager::GetScriptGlobalAndDocument(nsIDocument** aDoc)
{
nsCOMPtr<nsINode> node(do_QueryInterface(mTarget));
nsCOMPtr<nsIDocument> doc;
nsCOMPtr<nsIScriptGlobalObject> global;
if (node) {
// Try to get context from doc
// XXX sXBL/XBL2 issue -- do we really want the owner here? What
// if that's the XBL document?
doc = node->OwnerDoc();
if (doc->IsLoadedAsData()) {
return nullptr;
}
// We want to allow compiling an event handler even in an unloaded
// document, so use GetScopeObject here, not GetScriptHandlingObject.
global = do_QueryInterface(doc->GetScopeObject());
} else {
nsCOMPtr<nsPIDOMWindow> win = GetTargetAsInnerWindow();
if (win) {
doc = win->GetExtantDoc();
global = do_QueryInterface(win);
} else {
global = do_QueryInterface(mTarget);
}
}
doc.forget(aDoc);
return global.forget();
}
} // namespace mozilla
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