Bug 700741 - Add and implement nsIFocusManager.elementIsFocusable r=Enn

dom/base/nsFocusManager.cpp

@@ -465,6 +465,19 @@ nsFocusManager::SetFocus(nsIDOMElement* aElement, PRUint32 aFlags)
   return NS_OK;
 }
 
+NS_IMETHODIMP
+nsFocusManager::ElementIsFocusable(nsIDOMElement* aElement, PRUint32 aFlags,
+                                   bool* aIsFocusable)
+{
+  NS_ENSURE_TRUE(aElement, NS_ERROR_INVALID_ARG);
+
+  nsCOMPtr<nsIContent> aContent = do_QueryInterface(aElement);
+
+  *aIsFocusable = CheckIfFocusable(aContent, aFlags) != nsnull;
+
+  return NS_OK;
+}
+
 NS_IMETHODIMP
 nsFocusManager::MoveFocus(nsIDOMWindow* aWindow, nsIDOMElement* aStartElement,
                           PRUint32 aType, PRUint32 aFlags, nsIDOMElement** aElement)

dom/interfaces/base/nsIFocusManager.idl

@@ -166,6 +166,11 @@ interface nsIFocusManager : nsISupports
    */
   void moveCaretToFocus(in nsIDOMWindow aWindow);
 
+  /***
+   * Check if given element is focusable.
+   */
+  boolean elementIsFocusable(in nsIDOMElement aElement, in unsigned long aFlags);
+
   /*
    * Raise the window when switching focus
    */