Bug 349860. Magnifier doesn't follow input or caret navigation. r=evan.yan

accessible/src/html/nsHTMLFormControlAccessible.cpp

@@ -311,6 +311,43 @@ NS_IMETHODIMP nsHTMLTextFieldAccessible::Shutdown()
   return nsHyperTextAccessible::Shutdown();
 }
 
+void nsHTMLTextFieldAccessible::CacheChildren()
+{
+  if (!mWeakShell) {
+    // This node has been shut down
+    mAccChildCount = eChildCountUninitialized;
+    return;
+  }
+
+  if (mAccChildCount == eChildCountUninitialized) {
+    nsCOMPtr<nsIEditor> editor = GetEditor();
+    if (!editor) {
+      nsAccessible::CacheChildren();
+      return;
+    }
+    nsCOMPtr<nsIDOMElement> editorRoot;
+    editor->GetRootElement(getter_AddRefs(editorRoot));
+    nsCOMPtr<nsIDOMNode> editorRootDOMNode = do_QueryInterface(editorRoot);
+    if (!editorRootDOMNode) {
+      return;
+    }
+    nsAccessibleTreeWalker walker(mWeakShell, editorRootDOMNode, PR_TRUE);
+    nsCOMPtr<nsPIAccessible> privatePrevAccessible;
+    PRInt32 childCount = 0;
+    walker.GetFirstChild();
+    SetFirstChild(walker.mState.accessible);
+
+    while (walker.mState.accessible) {
+      ++ childCount;
+      privatePrevAccessible = do_QueryInterface(walker.mState.accessible);
+      privatePrevAccessible->SetParent(this);
+      walker.GetNextSibling();
+      privatePrevAccessible->SetNextSibling(walker.mState.accessible);
+    }
+    mAccChildCount = childCount;
+  }
+}
+
 NS_IMETHODIMP nsHTMLTextFieldAccessible::GetRole(PRUint32 *aRole)
 {
   *aRole = ROLE_ENTRY;

accessible/src/html/nsHTMLFormControlAccessible.h

@@ -110,6 +110,7 @@ public:
   NS_IMETHOD GetActionName(PRUint8 index, nsAString& _retval);
   NS_IMETHOD DoAction(PRUint8 index);
   NS_IMETHOD GetExtState(PRUint32 *aExtState); 
+  void CacheChildren();
 
 protected:
   // Editor helpers, subclasses of nsHyperTextAccessible may have editor