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Diffstat (limited to '')
| -rw-r--r-- | dom/events/DOMEventTargetHelper.cpp | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/dom/events/DOMEventTargetHelper.cpp b/dom/events/DOMEventTargetHelper.cpp new file mode 100644 index 0000000000..2604a5a47b --- /dev/null +++ b/dom/events/DOMEventTargetHelper.cpp @@ -0,0 +1,265 @@ +/* -*- 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 "mozilla/dom/Document.h" +#include "mozilla/Sprintf.h" +#include "mozilla/dom/Event.h" +#include "mozilla/DOMEventTargetHelper.h" +#include "mozilla/EventDispatcher.h" +#include "mozilla/EventListenerManager.h" +#include "mozilla/Likely.h" +#include "MainThreadUtils.h" + +namespace mozilla { + +using namespace dom; + +NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(DOMEventTargetHelper) + +NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INTERNAL(DOMEventTargetHelper) + if (MOZ_UNLIKELY(cb.WantDebugInfo())) { + char name[512]; + nsAutoString uri; + if (tmp->GetOwner() && tmp->GetOwner()->GetExtantDoc()) { + Unused << tmp->GetOwner()->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 + if (tmp->mListenerManager) { + tmp->mListenerManager->Disconnect(); + 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( + static_cast<dom::EventTarget*>(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_AMBIGUOUS(nsISupports, EventTarget) + NS_INTERFACE_MAP_ENTRY(GlobalTeardownObserver) + NS_INTERFACE_MAP_ENTRY(dom::EventTarget) + NS_INTERFACE_MAP_ENTRY_CONCRETE(DOMEventTargetHelper) +NS_INTERFACE_MAP_END + +NS_IMPL_CYCLE_COLLECTING_ADDREF(DOMEventTargetHelper) +NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(DOMEventTargetHelper, + LastRelease()) + +DOMEventTargetHelper::DOMEventTargetHelper() = default; + +DOMEventTargetHelper::DOMEventTargetHelper(nsPIDOMWindowInner* aWindow) + : GlobalTeardownObserver(aWindow ? aWindow->AsGlobal() : nullptr) {} + +DOMEventTargetHelper::DOMEventTargetHelper(nsIGlobalObject* aGlobalObject) + : GlobalTeardownObserver(aGlobalObject) {} + +DOMEventTargetHelper::DOMEventTargetHelper(DOMEventTargetHelper* aOther) + : GlobalTeardownObserver(aOther ? aOther->GetParentObject() : nullptr, + aOther ? aOther->HasOrHasHadOwner() : false) {} + +DOMEventTargetHelper::~DOMEventTargetHelper() { + if (mListenerManager) { + mListenerManager->Disconnect(); + } + ReleaseWrapper(this); +} + +void DOMEventTargetHelper::DisconnectFromOwner() { + GlobalTeardownObserver::DisconnectFromOwner(); + + // 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(CheckCurrentGlobalCorrectness())) { + return nullptr; + } + + return GetOwner(); +} + +Document* 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(Event* event) { + event->SetTrusted(true); + + ErrorResult rv; + DispatchEvent(*event, 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 = CheckCurrentGlobalCorrectness(); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<Document> 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::EventListenerRemoved(nsAtom* aType) { + MaybeUpdateKeepAlive(); +} + +void DOMEventTargetHelper::KeepAliveIfHasListenersFor(nsAtom* aType) { + mKeepingAliveTypes.AppendElement(aType); + MaybeUpdateKeepAlive(); +} + +void DOMEventTargetHelper::IgnoreKeepAliveIfHasListenersFor(nsAtom* aType) { + mKeepingAliveTypes.RemoveElement(aType); + MaybeUpdateKeepAlive(); +} + +void DOMEventTargetHelper::MaybeUpdateKeepAlive() { + bool shouldBeKeptAlive = false; + + if (NS_SUCCEEDED(CheckCurrentGlobalCorrectness())) { + if (!mKeepingAliveTypes.IsEmpty()) { + for (uint32_t i = 0; i < mKeepingAliveTypes.Length(); ++i) { + if (HasListenersFor(mKeepingAliveTypes[i])) { + shouldBeKeptAlive = true; + break; + } + } + } + } + + if (shouldBeKeptAlive == mIsKeptAlive) { + return; + } + + mIsKeptAlive = shouldBeKeptAlive; + if (mIsKeptAlive) { + AddRef(); + } else { + Release(); + } +} + +void DOMEventTargetHelper::MaybeDontKeepAlive() { + if (mIsKeptAlive) { + mIsKeptAlive = false; + Release(); + } +} + +bool DOMEventTargetHelper::HasListenersFor(const nsAString& aType) const { + return mListenerManager && mListenerManager->HasListenersFor(aType); +} + +bool DOMEventTargetHelper::HasListenersFor(nsAtom* aTypeWithOn) const { + return mListenerManager && mListenerManager->HasListenersFor(aTypeWithOn); +} + +} // namespace mozilla |