gecko-dev/dom/events/DOMEventTargetHelper.cpp

359 строки
8.8 KiB
C++

/* -*- 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 "nsContentUtils.h"
#include "nsIDocument.h"
#include "mozilla/Sprintf.h"
#include "nsGlobalWindow.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/DOMEventTargetHelper.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventListenerManager.h"
#include "mozilla/Likely.h"
namespace mozilla {
using namespace dom;
NS_IMPL_CYCLE_COLLECTION_CLASS(DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(DOMEventTargetHelper)
if (MOZ_UNLIKELY(cb.WantDebugInfo())) {
char name[512];
nsAutoString uri;
if (tmp->mOwnerWindow && tmp->mOwnerWindow->GetExtantDoc()) {
Unused << tmp->mOwnerWindow->GetExtantDoc()->GetDocumentURI(uri);
}
nsXPCOMCycleCollectionParticipant* participant = nullptr;
CallQueryInterface(tmp, &participant);
SprintfLiteral(name, "%s %s",
participant->ClassName(),
NS_ConvertUTF16toUTF8(uri).get());
cb.DescribeRefCountedNode(tmp->mRefCnt.get(), name);
} else {
NS_IMPL_CYCLE_COLLECTION_DESCRIBE(DOMEventTargetHelper, tmp->mRefCnt.get())
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mListenerManager)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
NS_IMPL_CYCLE_COLLECTION_UNLINK(mListenerManager)
tmp->MaybeDontKeepAlive();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(DOMEventTargetHelper)
bool hasLiveWrapper = tmp->HasKnownLiveWrapper();
if (hasLiveWrapper || tmp->IsCertainlyAliveForCC()) {
if (tmp->mListenerManager) {
tmp->mListenerManager->MarkForCC();
}
if (!hasLiveWrapper && tmp->PreservingWrapper()) {
tmp->MarkWrapperLive();
}
return true;
}
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(DOMEventTargetHelper)
return tmp->HasKnownLiveWrapperAndDoesNotNeedTracing(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(DOMEventTargetHelper)
return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(DOMEventTargetHelper)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_ENTRY(nsIDOMEventTarget)
NS_INTERFACE_MAP_ENTRY(dom::EventTarget)
NS_INTERFACE_MAP_ENTRY(DOMEventTargetHelper)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(DOMEventTargetHelper,
LastRelease())
DOMEventTargetHelper::~DOMEventTargetHelper()
{
if (mParentObject) {
mParentObject->RemoveEventTargetObject(this);
}
if (mListenerManager) {
mListenerManager->Disconnect();
}
ReleaseWrapper(this);
}
void
DOMEventTargetHelper::BindToOwner(nsPIDOMWindowInner* aOwner)
{
BindToOwner(aOwner ? aOwner->AsGlobal() : nullptr);
}
void
DOMEventTargetHelper::BindToOwner(nsIGlobalObject* aOwner)
{
if (mParentObject) {
mParentObject->RemoveEventTargetObject(this);
if (mOwnerWindow) {
mOwnerWindow = nullptr;
}
mParentObject = nullptr;
mHasOrHasHadOwnerWindow = false;
}
if (aOwner) {
mParentObject = aOwner;
aOwner->AddEventTargetObject(this);
// Let's cache the result of this QI for fast access and off main thread usage
mOwnerWindow = nsCOMPtr<nsPIDOMWindowInner>(do_QueryInterface(aOwner)).get();
if (mOwnerWindow) {
mHasOrHasHadOwnerWindow = true;
}
}
}
void
DOMEventTargetHelper::BindToOwner(DOMEventTargetHelper* aOther)
{
if (!aOther) {
BindToOwner(static_cast<nsIGlobalObject*>(nullptr));
return;
}
BindToOwner(aOther->GetParentObject());
mHasOrHasHadOwnerWindow = aOther->HasOrHasHadOwner();
}
void
DOMEventTargetHelper::DisconnectFromOwner()
{
if (mParentObject) {
mParentObject->RemoveEventTargetObject(this);
}
mOwnerWindow = nullptr;
mParentObject = nullptr;
// Event listeners can't be handled anymore, so we can release them here.
if (mListenerManager) {
mListenerManager->Disconnect();
mListenerManager = nullptr;
}
MaybeDontKeepAlive();
}
nsPIDOMWindowInner*
DOMEventTargetHelper::GetWindowIfCurrent() const
{
if (NS_FAILED(CheckInnerWindowCorrectness())) {
return nullptr;
}
return GetOwner();
}
nsIDocument*
DOMEventTargetHelper::GetDocumentIfCurrent() const
{
nsPIDOMWindowInner* win = GetWindowIfCurrent();
if (!win) {
return nullptr;
}
return win->GetDoc();
}
bool
DOMEventTargetHelper::ComputeDefaultWantsUntrusted(ErrorResult& aRv)
{
bool wantsUntrusted;
nsresult rv = WantsUntrusted(&wantsUntrusted);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
return false;
}
return wantsUntrusted;
}
bool
DOMEventTargetHelper::DispatchEvent(Event& aEvent, CallerType aCallerType,
ErrorResult& aRv)
{
nsEventStatus status = nsEventStatus_eIgnore;
nsresult rv =
EventDispatcher::DispatchDOMEvent(this, nullptr, &aEvent, nullptr, &status);
bool retval = !aEvent.DefaultPrevented(aCallerType);
if (NS_FAILED(rv)) {
aRv.Throw(rv);
}
return retval;
}
nsresult
DOMEventTargetHelper::DispatchTrustedEvent(const nsAString& aEventName)
{
RefPtr<Event> event = NS_NewDOMEvent(this, nullptr, nullptr);
event->InitEvent(aEventName, false, false);
return DispatchTrustedEvent(event);
}
nsresult
DOMEventTargetHelper::DispatchTrustedEvent(nsIDOMEvent* event)
{
event->SetTrusted(true);
ErrorResult rv;
DispatchEvent(*event->InternalDOMEvent(), rv);
return rv.StealNSResult();
}
void
DOMEventTargetHelper::GetEventTargetParent(EventChainPreVisitor& aVisitor)
{
aVisitor.mCanHandle = true;
aVisitor.SetParentTarget(nullptr, false);
}
nsresult
DOMEventTargetHelper::PostHandleEvent(EventChainPostVisitor& aVisitor)
{
return NS_OK;
}
EventListenerManager*
DOMEventTargetHelper::GetOrCreateListenerManager()
{
if (!mListenerManager) {
mListenerManager = new EventListenerManager(this);
}
return mListenerManager;
}
EventListenerManager*
DOMEventTargetHelper::GetExistingListenerManager() const
{
return mListenerManager;
}
nsresult
DOMEventTargetHelper::WantsUntrusted(bool* aRetVal)
{
nsresult rv = CheckInnerWindowCorrectness();
NS_ENSURE_SUCCESS(rv, rv);
nsCOMPtr<nsIDocument> doc = GetDocumentIfCurrent();
// We can let listeners on workers to always handle all the events.
*aRetVal = (doc && !nsContentUtils::IsChromeDoc(doc)) || !NS_IsMainThread();
return rv;
}
void
DOMEventTargetHelper::EventListenerAdded(nsAtom* aType)
{
MaybeUpdateKeepAlive();
}
void
DOMEventTargetHelper::EventListenerAdded(const nsAString& aType)
{
MaybeUpdateKeepAlive();
}
void
DOMEventTargetHelper::EventListenerRemoved(nsAtom* aType)
{
MaybeUpdateKeepAlive();
}
void
DOMEventTargetHelper::EventListenerRemoved(const nsAString& aType)
{
MaybeUpdateKeepAlive();
}
void
DOMEventTargetHelper::KeepAliveIfHasListenersFor(const nsAString& aType)
{
mKeepingAliveTypes.mStrings.AppendElement(aType);
MaybeUpdateKeepAlive();
}
void
DOMEventTargetHelper::KeepAliveIfHasListenersFor(nsAtom* aType)
{
mKeepingAliveTypes.mAtoms.AppendElement(aType);
MaybeUpdateKeepAlive();
}
void
DOMEventTargetHelper::IgnoreKeepAliveIfHasListenersFor(const nsAString& aType)
{
mKeepingAliveTypes.mStrings.RemoveElement(aType);
MaybeUpdateKeepAlive();
}
void
DOMEventTargetHelper::IgnoreKeepAliveIfHasListenersFor(nsAtom* aType)
{
mKeepingAliveTypes.mAtoms.RemoveElement(aType);
MaybeUpdateKeepAlive();
}
void
DOMEventTargetHelper::MaybeUpdateKeepAlive()
{
bool shouldBeKeptAlive = false;
if (!mKeepingAliveTypes.mAtoms.IsEmpty()) {
for (uint32_t i = 0; i < mKeepingAliveTypes.mAtoms.Length(); ++i) {
if (HasListenersFor(mKeepingAliveTypes.mAtoms[i])) {
shouldBeKeptAlive = true;
break;
}
}
}
if (!shouldBeKeptAlive && !mKeepingAliveTypes.mStrings.IsEmpty()) {
for (uint32_t i = 0; i < mKeepingAliveTypes.mStrings.Length(); ++i) {
if (HasListenersFor(mKeepingAliveTypes.mStrings[i])) {
shouldBeKeptAlive = true;
break;
}
}
}
if (shouldBeKeptAlive == mIsKeptAlive) {
return;
}
mIsKeptAlive = shouldBeKeptAlive;
if (mIsKeptAlive) {
AddRef();
} else {
Release();
}
}
void
DOMEventTargetHelper::MaybeDontKeepAlive()
{
if (mIsKeptAlive) {
mIsKeptAlive = false;
Release();
}
}
} // namespace mozilla