Keep track of accessibility focus across windows.

third_party/WebKit/Source/modules/accessibility/AXObjectCacheImpl.cpp

 /*
  * Copyright (C) 2014, Google 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
@@ skipping 131 matching lines @@
         if (!child->isImageMapLink())
             continue;
 
         if (toAXImageMapLink(child)->areaElement() == areaElement)
             return child;
     }
 
     return 0;
 }
 
-AXObject* AXObjectCacheImpl::focusedUIElementForPage(const Page* page)
+AXObject* AXObjectCacheImpl::focusedObject()
 {
-    if (!page->settings().accessibilityEnabled())
+    if (!accessibilityEnabled())
         return 0;
 
-    // Cross-process accessibility is not yet implemented.
-    if (!page->focusController().focusedOrMainFrame()->isLocalFrame())
+    // We don't have to return anything if the focused frame is not local;
+    // the remote frame will have its own AXObjectCacheImpl and the focused
+    // object will be sorted out by the browser process.
+    Page* page = m_document->page();
+    if (!page->focusController().focusedFrame())
         return 0;
 
-    // get the focused node in the page
-    Document* focusedDocument = toLocalFrame(page->focusController().focusedOrMainFrame())->document();
+    // Get the focused node in the page.
+    Document* focusedDocument = page->focusController().focusedFrame()->document();
     Node* focusedNode = focusedDocument->focusedElement();
     if (!focusedNode)
         focusedNode = focusedDocument;
 
-    if (isHTMLAreaElement(*focusedNode))
+    // If it's an image map, get the focused link within the image map.
+    if (isHTMLAreaElement(focusedNode))
         return focusedImageMapUIElement(toHTMLAreaElement(focusedNode));
 
+    // See if there's a page popup, for example a calendar picker.
+    Element* adjustedFocusedElement = focusedDocument->adjustedFocusedElement();
+    if (isHTMLInputElement(adjustedFocusedElement)) {
+        if (AXObject* axPopup = toHTMLInputElement(adjustedFocusedElement)->popupRootAXObject()) {
+            if (Element* focusedElementInPopup = axPopup->document()->focusedElement())
+                focusedNode = focusedElementInPopup;
+        }
+
+    }
+
     AXObject* obj = getOrCreate(focusedNode);
     if (!obj)
         return 0;
 
     if (obj->shouldFocusActiveDescendant()) {
         if (AXObject* descendant = obj->activeDescendant())
             obj = descendant;
     }
 
     // the HTML element, for example, is focusable but has an AX object that is ignored
@@ skipping 933 matching lines @@
 
 void AXObjectCacheImpl::handleFocusedUIElementChanged(Node* oldFocusedNode, Node* newFocusedNode)
 {
     if (!newFocusedNode)
         return;
 
     Page* page = newFocusedNode->document().page();
     if (!page)
         return;
 
-    AXObject* focusedObject = focusedUIElementForPage(page);
+    AXObject* focusedObject = this->focusedObject();
     if (!focusedObject)
         return;
 
     AXObject* oldFocusedObject = get(oldFocusedNode);
 
     postPlatformNotification(oldFocusedObject, AXBlur);
     postPlatformNotification(focusedObject, AXFocusedUIElementChanged);
 }
 
 void AXObjectCacheImpl::handleInitialFocus()
@@ skipping 114 matching lines @@
     visitor->trace(m_nodeObjectMapping);
 #endif
 
     visitor->trace(m_objects);
     visitor->trace(m_notificationsToPost);
 
     AXObjectCache::trace(visitor);
 }
 
 } // namespace blink