Bug 194980 Accessible state change events no longer fired for checkboxes and radios

r=aaronl, sr=henry.jia
rewrite nsHTMLInputElement::FireEventForAccessibility() function

accessible/src/base/nsRootAccessible.cpp

@@ -580,15 +580,6 @@ NS_IMETHODIMP nsRootAccessible::HandleEvent(nsIDOMEvent* aEvent)
     else if (eventType.EqualsIgnoreCase("change")) {
       if (selectElement) // it's a HTML <select>
         HandleEvent(nsIAccessibleEventListener::EVENT_ATK_SELECTION_CHANGE, accessible, nsnull);
-      else {
-        nsCOMPtr<nsIDOMHTMLInputElement> inputElement(do_QueryInterface(targetNode));
-        if (inputElement) { // it's a HTML <input>
-          accessible->GetAccState(&stateData.state);
-          stateData.enable = (stateData.state & STATE_CHECKED) != 0;
-          stateData.state = STATE_CHECKED;
-          HandleEvent(nsIAccessibleEventListener::EVENT_STATE_CHANGE, accessible, &stateData);
-        }
-      }
     }
     else if (eventType.EqualsIgnoreCase("select")) {
       if (selectControl) // it's a XUL <listbox>

content/html/content/src/nsHTMLInputElement.cpp

@@ -2171,43 +2171,20 @@ nsresult
 nsHTMLInputElement::FireEventForAccessibility(nsIPresContext* aPresContext,
                                               const nsAString& aEventType)
 {
-  nsCOMPtr<nsIEventListenerManager> listenerManager;
-
-  nsresult rv = GetListenerManager(getter_AddRefs(listenerManager));
-  if ( !listenerManager )
-    return rv;
-
-  // Create the DOM event
-  nsCOMPtr<nsIDOMEvent> domEvent;
-  rv = listenerManager->CreateEvent(aPresContext,
-                                    nsnull, 
-                                    NS_LITERAL_STRING("MutationEvents"),
-                                    getter_AddRefs(domEvent) );
-  if ( !domEvent )
-    return NS_ERROR_FAILURE;
-
-  // Initialize the mutation event
-  nsCOMPtr<nsIDOMMutationEvent> mutEvent(do_QueryInterface(domEvent));
-  if ( !mutEvent )
-    return NS_ERROR_FAILURE;
-  nsAutoString empty;
-  mutEvent->InitMutationEvent( aEventType, PR_TRUE, PR_TRUE, nsnull, empty, empty, empty, nsIDOMMutationEvent::MODIFICATION);
-
-  // Set the target of the event to this nsHTMLInputElement, which should be checkbox content??
-  nsCOMPtr<nsIPrivateDOMEvent> privEvent(do_QueryInterface(domEvent));
-  if ( ! privEvent )
-    return NS_ERROR_FAILURE;
-  nsCOMPtr<nsIDOMEventTarget> targ(do_QueryInterface(NS_STATIC_CAST(nsIDOMHTMLInputElement *, this)));
-  if ( ! targ )
-    return NS_ERROR_FAILURE;
-  privEvent->SetTarget(targ);
-
-  // Dispatch the event
-  nsCOMPtr<nsIDOMEventReceiver> eventReceiver(do_QueryInterface(listenerManager));
-  if ( ! eventReceiver )
-    return NS_ERROR_FAILURE;
-  PRBool noDefault;
-  eventReceiver->DispatchEvent(domEvent, &noDefault);
+  nsCOMPtr<nsIDOMEvent> event;
+  nsCOMPtr<nsIEventListenerManager> manager;
+  nsresult rv = GetListenerManager(getter_AddRefs(manager));
+  if (manager &&
+      NS_SUCCEEDED(manager->CreateEvent(aPresContext, nsnull, NS_LITERAL_STRING("Events"), getter_AddRefs(event)))) {
+    event->InitEvent(aEventType, PR_TRUE, PR_TRUE);
+    PRBool noDefault;
+    nsCOMPtr<nsIEventStateManager> esm;
+    aPresContext->GetEventStateManager(getter_AddRefs(esm));
+    if (esm) {
+      nsCOMPtr<nsISupports> target(do_QueryInterface(NS_STATIC_CAST(nsIDOMHTMLInputElement *, this)));
+      esm->DispatchNewEvent(target, event, &noDefault);
+    }
+  }
 
   return NS_OK;
 }