// AddRootListener - Add a listener for an event whose reference is always the
// root and scope is all elements
private static void AddRootListener(Tracker idx, Delegate eventCallback, EventListener l)
{
lock ( _classLock )
{
// Add this listener to client-side store of listeners and give the server
// a chance to enable accessibility for this event
AddListener(AutomationElement.RootElement, eventCallback, l);
// Track WinEvents
WinEventWrap eventWrapper = _winEventTrackers[(int)idx];
if (eventWrapper == null)
{
// First time create a WinEvent tracker and start listening
AddWinEventListener(idx, GetNewRootTracker(idx));
}
else
{
// Subsequent times just add the callback to the existing WinEvent
eventWrapper.AddCallback(eventCallback);
}
}
}
