Fire an event when a menu list option becomes unselected.

Source/modules/accessibility/AXMenuListPopup.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 17 matching lines @@
 
 #include "core/html/HTMLSelectElement.h"
 #include "modules/accessibility/AXMenuListOption.h"
 #include "modules/accessibility/AXObjectCacheImpl.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 AXMenuListPopup::AXMenuListPopup(AXObjectCacheImpl* axObjectCache)
-    : AXMockObject(axObjectCache)
+    : AXMockObject(axObjectCache), m_activeIndex(-1)
 {
 }
 
 bool AXMenuListPopup::isVisible() const
 {
     return false;
 }
 
 bool AXMenuListPopup::isOffScreen() const
 {
@@ skipping 44 matching lines @@
 {
     if (!m_parent)
         return;
 
     Node* selectNode = m_parent->node();
     if (!selectNode)
         return;
 
     m_haveChildren = true;
 
-    const WillBeHeapVector<RawPtrWillBeMember<HTMLElement>>& listItems = toHTMLSelectElement(selectNode)->listItems();
+    HTMLSelectElement* htmlSelectElement = toHTMLSelectElement(selectNode);
+    m_activeIndex = htmlSelectElement->selectedIndex();
+    const WillBeHeapVector<RawPtrWillBeMember<HTMLElement>>& listItems = htmlSelectElement->listItems();
     unsigned length = listItems.size();
     for (unsigned i = 0; i < length; i++) {
         AXMenuListOption* option = menuListOptionAXObject(listItems[i]);
         if (option) {
             option->setParent(this);
             m_children.append(option);
         }
     }
 }
 
@@ skipping 20 matching lines @@
 {
     // We defer creation of the children until updating the active option so that we don't
     // create AXObjects for <option> elements while they're in the middle of removal.
     if (!m_haveChildren)
         addChildren();
 
     ASSERT_ARG(optionIndex, optionIndex >= 0);
     ASSERT_ARG(optionIndex, optionIndex < static_cast<int>(m_children.size()));
 
     AXObjectCacheImpl* cache = axObjectCache();
+    if (m_activeIndex >= 0 && m_activeIndex < static_cast<int>(m_children.size())) {
+        RefPtr<AXObject> previousChild = m_children[m_activeIndex].get();
+        cache->postNotification(previousChild.get(), document(), AXObjectCacheImpl::AXMenuListItemUnselected, true);
+    }
+
     RefPtr<AXObject> child = m_children[optionIndex].get();
-
     cache->postNotification(child.get(), document(), AXObjectCacheImpl::AXFocusedUIElementChanged, true);
     cache->postNotification(child.get(), document(), AXObjectCacheImpl::AXMenuListItemSelected, true);
+    m_activeIndex = optionIndex;
 }
 
 } // namespace blink