Bug 1292063 - Part 3: Add mComposedInNativeAnonymousContent to determine which events can cross the boundary of native anonymous content. r=smaug

--HG--
extra : rebase_source : 6b3fcc52b2a099944cc1a0427a36624394fb3b2e

dom/base/FragmentOrElement.cpp

@@ -864,7 +864,11 @@ nsIContent::PreHandleEvent(EventChainPreVisitor& aVisitor)
     }
   }
 
-  if (parent) {
+  if (!aVisitor.mEvent->mFlags.mComposedInNativeAnonymousContent &&
+      IsRootOfNativeAnonymousSubtree() && OwnerDoc() &&
+      OwnerDoc()->GetWindow()) {
+    aVisitor.mParentTarget = OwnerDoc()->GetWindow()->GetParentTarget();
+  } else if (parent) {
     aVisitor.mParentTarget = parent;
   } else {
     aVisitor.mParentTarget = GetComposedDoc();

dom/events/Event.cpp

@@ -575,6 +575,7 @@ Event::SetEventType(const nsAString& aEventTypeArg)
     mEvent->mSpecifiedEventTypeString = aEventTypeArg;
     mEvent->SetComposed(aEventTypeArg);
   }
+  mEvent->SetDefaultComposedInNativeAnonymousContent();
 }
 
 void

widget/BasicEvents.h

@@ -129,6 +129,9 @@ public:
   // If mComposed is true, the event fired by nodes in shadow DOM can cross the
   // boundary of shadow DOM and light DOM.
   bool mComposed : 1;
+  // Similar to mComposed. Set it to true to allow events cross the boundary
+  // between native non-anonymous content and native anonymouse content
+  bool mComposedInNativeAnonymousContent : 1;
 
   // If the event is being handled in target phase, returns true.
   inline bool InTargetPhase() const
@@ -343,6 +346,7 @@ protected:
     mFlags.mIsTrusted = aIsTrusted;
     SetDefaultCancelableAndBubbles();
     SetDefaultComposed();
+    SetDefaultComposedInNativeAnonymousContent();
   }
 
   WidgetEvent()
@@ -680,6 +684,20 @@ public:
   {
     mFlags.mComposed = aComposed;
   }
+
+  void SetDefaultComposedInNativeAnonymousContent()
+  {
+    // For compatibility concerns, we set mComposedInNativeAnonymousContent to
+    // false for those events we want to stop propagation.
+    //
+    // nsVideoFrame may create anonymous image element which fires eLoad,
+    // eLoadStart, eLoadEnd, eLoadError. We don't want these events cross
+    // the boundary of NAC
+    mFlags.mComposedInNativeAnonymousContent = mMessage != eLoad &&
+                                               mMessage != eLoadStart &&
+                                               mMessage != eLoadEnd &&
+                                               mMessage != eLoadError;
+  }
 };
 
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