Bug 553005 - add getApplicationAccessible() method to nsIAccesibleRetrival, r=davidb

accessible/public/nsIAccessibleRetrieval.idl

@@ -56,9 +56,14 @@ interface nsIDOMDOMStringList;
  *
  * @status UNDER_REVIEW
  */
-[scriptable, uuid(5f5a6f98-835d-4771-8bfe-a0c7cdc85fec)]
+[scriptable, uuid(3df14f00-7253-4b9c-97c2-b4632090da23)]
 interface nsIAccessibleRetrieval : nsISupports
 {
+  /**
+   * Return application accessible.
+   */
+  nsIAccessible getApplicationAccessible();
+
   /**
    * Return an nsIAccessible for a DOM node in pres shell 0.
    * Create a new accessible of the appropriate type if necessary,

accessible/src/base/nsAccessibilityService.cpp

@@ -960,6 +960,19 @@ nsAccessibilityService::GetCachedAccessNode(nsIDOMNode *aNode,
 ////////////////////////////////////////////////////////////////////////////////
 // nsIAccessibleRetrieval
 
+NS_IMETHODIMP
+nsAccessibilityService::GetApplicationAccessible(nsIAccessible **aApplicationAccessible)
+{
+  NS_ENSURE_ARG_POINTER(aApplicationAccessible);
+  *aApplicationAccessible = nsnull;
+
+  nsRefPtr<nsApplicationAccessibleWrap> appAcc =
+    nsAccessNode::GetApplicationAccessible();
+  NS_ENSURE_STATE(appAcc);
+
+  return CallQueryInterface(appAcc, aApplicationAccessible);
+}
+
 NS_IMETHODIMP
 nsAccessibilityService::GetStringRole(PRUint32 aRole, nsAString& aString)
 {

accessible/tests/mochitest/common.js

@@ -277,28 +277,7 @@ function getRootAccessible(aAccOrElmOrID)
  */
 function getApplicationAccessible()
 {
-  var acc = getAccessible(document), parent = null;
-  while (acc) {
-
-    try {
-      parent = acc.parent;
-    } catch (e) {
-      ok(false, "Can't get a parent for " + prettyName(acc));
-      return null;
-    }
-
-    if (!parent) {
-      if (acc.role == ROLE_APP_ROOT)
-        return acc;
-
-      ok(false, "No application accessible!");
-      return null;
-    }
-
-    acc = parent;
-  }
-
-  return null;
+  return gAccRetrieval.getApplicationAccessible();
 }
 
 /**