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-rw-r--r--dom/events/AsyncEventDispatcher.cpp156
1 files changed, 156 insertions, 0 deletions
diff --git a/dom/events/AsyncEventDispatcher.cpp b/dom/events/AsyncEventDispatcher.cpp
new file mode 100644
index 0000000000..297a03d7cb
--- /dev/null
+++ b/dom/events/AsyncEventDispatcher.cpp
@@ -0,0 +1,156 @@
+/* -*- 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 "mozilla/AsyncEventDispatcher.h"
+#include "mozilla/BasicEvents.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/dom/DocumentInlines.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/EventTarget.h"
+#include "nsContentUtils.h"
+
+namespace mozilla {
+
+using namespace dom;
+
+/******************************************************************************
+ * mozilla::AsyncEventDispatcher
+ ******************************************************************************/
+
+AsyncEventDispatcher::AsyncEventDispatcher(EventTarget* aTarget,
+ WidgetEvent& aEvent)
+ : CancelableRunnable("AsyncEventDispatcher"),
+ mTarget(aTarget),
+ mEventMessage(eUnidentifiedEvent) {
+ MOZ_ASSERT(mTarget);
+ RefPtr<Event> event =
+ EventDispatcher::CreateEvent(aTarget, nullptr, &aEvent, u""_ns);
+ mEvent = std::move(event);
+ mEventType.SetIsVoid(true);
+ NS_ASSERTION(mEvent, "Should never fail to create an event");
+ mEvent->DuplicatePrivateData();
+ mEvent->SetTrusted(aEvent.IsTrusted());
+}
+
+NS_IMETHODIMP
+AsyncEventDispatcher::Run() {
+ if (mCanceled) {
+ return NS_OK;
+ }
+ nsINode* node = nsINode::FromEventTargetOrNull(mTarget);
+ if (mCheckStillInDoc) {
+ MOZ_ASSERT(node);
+ if (!node->IsInComposedDoc()) {
+ return NS_OK;
+ }
+ }
+ mTarget->AsyncEventRunning(this);
+ if (mEventMessage != eUnidentifiedEvent) {
+ MOZ_ASSERT(mComposed == Composed::eDefault);
+ return nsContentUtils::DispatchTrustedEvent<WidgetEvent>(
+ node->OwnerDoc(), mTarget, mEventMessage, mCanBubble, Cancelable::eNo,
+ nullptr /* aDefaultAction */, mOnlyChromeDispatch);
+ }
+ // MOZ_KnownLives because this instance shouldn't be touched while running.
+ if (mEvent) {
+ DispatchEventOnTarget(MOZ_KnownLive(mTarget), MOZ_KnownLive(mEvent),
+ mOnlyChromeDispatch, mComposed);
+ } else {
+ DispatchEventOnTarget(MOZ_KnownLive(mTarget), mEventType, mCanBubble,
+ mOnlyChromeDispatch, mComposed);
+ }
+ return NS_OK;
+}
+
+// static
+void AsyncEventDispatcher::DispatchEventOnTarget(
+ EventTarget* aTarget, const nsAString& aEventType, CanBubble aCanBubble,
+ ChromeOnlyDispatch aOnlyChromeDispatch, Composed aComposed) {
+ RefPtr<Event> event = NS_NewDOMEvent(aTarget, nullptr, nullptr);
+ event->InitEvent(aEventType, aCanBubble, Cancelable::eNo);
+ event->SetTrusted(true);
+ DispatchEventOnTarget(aTarget, event, aOnlyChromeDispatch, aComposed);
+}
+
+// static
+void AsyncEventDispatcher::DispatchEventOnTarget(
+ EventTarget* aTarget, Event* aEvent, ChromeOnlyDispatch aOnlyChromeDispatch,
+ Composed aComposed) {
+ if (aComposed != Composed::eDefault) {
+ aEvent->WidgetEventPtr()->mFlags.mComposed = aComposed == Composed::eYes;
+ }
+ if (aOnlyChromeDispatch == ChromeOnlyDispatch::eYes) {
+ MOZ_ASSERT(aEvent->IsTrusted());
+ aEvent->WidgetEventPtr()->mFlags.mOnlyChromeDispatch = true;
+ }
+ aTarget->DispatchEvent(*aEvent);
+}
+
+nsresult AsyncEventDispatcher::Cancel() {
+ mCanceled = true;
+ return NS_OK;
+}
+
+nsresult AsyncEventDispatcher::PostDOMEvent() {
+ RefPtr<AsyncEventDispatcher> ensureDeletionWhenFailing = this;
+ return NS_DispatchToCurrentThread(ensureDeletionWhenFailing.forget());
+}
+
+void AsyncEventDispatcher::RunDOMEventWhenSafe() {
+ RefPtr<AsyncEventDispatcher> ensureDeletionWhenFailing = this;
+ nsContentUtils::AddScriptRunner(ensureDeletionWhenFailing.forget());
+}
+
+// static
+void AsyncEventDispatcher::RunDOMEventWhenSafe(
+ EventTarget& aTarget, const nsAString& aEventType, CanBubble aCanBubble,
+ ChromeOnlyDispatch aOnlyChromeDispatch /* = ChromeOnlyDispatch::eNo */,
+ Composed aComposed /* = Composed::eDefault */) {
+ if (nsContentUtils::IsSafeToRunScript()) {
+ OwningNonNull<EventTarget> target = aTarget;
+ DispatchEventOnTarget(target, aEventType, aCanBubble, aOnlyChromeDispatch,
+ aComposed);
+ return;
+ }
+ (new AsyncEventDispatcher(&aTarget, aEventType, aCanBubble,
+ aOnlyChromeDispatch, aComposed))
+ ->RunDOMEventWhenSafe();
+}
+
+void AsyncEventDispatcher::RunDOMEventWhenSafe(
+ EventTarget& aTarget, Event& aEvent,
+ ChromeOnlyDispatch aOnlyChromeDispatch /* = ChromeOnlyDispatch::eNo */) {
+ if (nsContentUtils::IsSafeToRunScript()) {
+ DispatchEventOnTarget(&aTarget, &aEvent, aOnlyChromeDispatch,
+ Composed::eDefault);
+ return;
+ }
+ (new AsyncEventDispatcher(&aTarget, do_AddRef(&aEvent), aOnlyChromeDispatch))
+ ->RunDOMEventWhenSafe();
+}
+
+// static
+nsresult AsyncEventDispatcher::RunDOMEventWhenSafe(
+ nsINode& aTarget, WidgetEvent& aEvent,
+ nsEventStatus* aEventStatus /* = nullptr */) {
+ if (nsContentUtils::IsSafeToRunScript()) {
+ // MOZ_KnownLive due to bug 1832202
+ nsPresContext* presContext = aTarget.OwnerDoc()->GetPresContext();
+ return EventDispatcher::Dispatch(MOZ_KnownLive(&aTarget),
+ MOZ_KnownLive(presContext), &aEvent,
+ nullptr, aEventStatus);
+ }
+ (new AsyncEventDispatcher(&aTarget, aEvent))->RunDOMEventWhenSafe();
+ return NS_OK;
+}
+
+void AsyncEventDispatcher::RequireNodeInDocument() {
+ MOZ_ASSERT(mTarget);
+ MOZ_ASSERT(mTarget->IsNode());
+ mCheckStillInDoc = true;
+}
+
+} // namespace mozilla