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-rw-r--r--dom/events/DOMEventTargetHelper.cpp265
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..9f8d9ed942
--- /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(
+ static_cast<EventTarget*>(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