Bug 1489308 part 3. Add a public RemoveAllListeners method on EventListenerManager. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D17321

--HG--
extra : moz-landing-system : lando

dom/events/EventListenerManager.cpp

@@ -147,10 +147,10 @@ EventListenerManager::~EventListenerManager() {
   // XXX azakai: Is there any reason to not just call Disconnect
   //             from right here, if not previously called?
   NS_ASSERTION(!mTarget, "didn't call Disconnect");
-  RemoveAllListeners();
+  RemoveAllListenersSilently();
 }
 
-void EventListenerManager::RemoveAllListeners() {
+void EventListenerManager::RemoveAllListenersSilently() {
   if (mClearingListeners) {
     return;
   }
@@ -1319,7 +1319,7 @@ void EventListenerManager::HandleEventInternal(nsPresContext* aPresContext,
 
 void EventListenerManager::Disconnect() {
   mTarget = nullptr;
-  RemoveAllListeners();
+  RemoveAllListenersSilently();
 }
 
 void EventListenerManager::AddEventListener(const nsAString& aType,
@@ -1706,6 +1706,19 @@ bool EventListenerManager::IsApzAwareEvent(nsAtom* aEvent) {
   return false;
 }
 
+void EventListenerManager::RemoveAllListeners() {
+  while (!mListeners.IsEmpty()) {
+    size_t idx = mListeners.Length() - 1;
+    RefPtr<nsAtom> type = mListeners.ElementAt(idx).mTypeAtom;
+    EventMessage message = mListeners.ElementAt(idx).mEventMessage;
+    mListeners.RemoveElementAt(idx);
+    NotifyEventListenerRemoved(type);
+    if (IsDeviceType(message)) {
+      DisableDevice(message);
+    }
+  }
+}
+
 already_AddRefed<nsIScriptGlobalObject>
 EventListenerManager::GetScriptGlobalAndDocument(Document** aDoc) {
   nsCOMPtr<nsINode> node(do_QueryInterface(mTarget));

dom/events/EventListenerManager.h

@@ -455,6 +455,12 @@ class EventListenerManager final : public EventListenerManagerBase {
   bool IsApzAwareListener(Listener* aListener);
   bool IsApzAwareEvent(nsAtom* aEvent);
 
+  /**
+   * Remove all event listeners from the event target this EventListenerManager
+   * is for.
+   */
+  void RemoveAllListeners();
+
  protected:
   void HandleEventInternal(nsPresContext* aPresContext, WidgetEvent* aEvent,
                            dom::Event** aDOMEvent,
@@ -580,7 +586,7 @@ class EventListenerManager final : public EventListenerManagerBase {
                                    nsAtom* aUserType,
                                    const EventListenerFlags& aFlags,
                                    bool aAllEvents = false);
-  void RemoveAllListeners();
+  void RemoveAllListenersSilently();
   void NotifyEventListenerRemoved(nsAtom* aUserType);
   const EventTypeData* GetTypeDataForIID(const nsIID& aIID);
   const EventTypeData* GetTypeDataForEventName(nsAtom* aName);