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