// Returns the Run Time Id.
//
// The RunTimeID is a array of int with RID [0] set to 1 and RID [1] the hwnd
// identifier. The remaining of the chain are values one per sub node in
// the raw element tree.
// Avalon and other none hwnd based elements have RunTimeIDs that never starts
// with '1'. This makes the RunTimeId for Win32 controls uniq.
//
// By default the _item data member is used as ID for each depth
// in the element tree
internal virtual int [] GetRuntimeId()
{
if (_fSubTree && !IsHwndElement())
{
// add the id for this level at the end of the chain
return(Misc.AppendToRuntimeId(GetParent().GetRuntimeId(), _item));
}
else
{
// UIA handles runtimeID for the HWND part for us
return(null);
}
}
