// IsListeningFor - called by UIAccess client during removal of listeners. Returns
// true if rid, eventId and clientCallback represent this listener instance.
internal bool IsListeningFor(AutomationEvent eventId, AutomationElement el, Delegate clientCallback)
{
// Removing the event handler using the element RuntimeId prevents problems with dead elements
int[] rid = null;
try
{
rid = el.GetRuntimeId();
}
catch (ElementNotAvailableException)
{
// This can't be the element this instance is holding because when
// creating this instance we caused the RuntimeId to be cached.
return(false);
}
if (!Misc.Compare(_refRid, rid))
{
return(false);
}
if (_eventListener.EventId != eventId)
{
return(false);
}
if (_clientCallback != clientCallback)
{
return(false);
}
return(true);
}
// WithinScope - returns true if rid is the RuntimeId of this listener or listening for all elements.
internal bool WithinScope(int [] rid)
{
// Quick look: If want all elements then no compare is necessary
if ((_eventListener.TreeScope & TreeScope.Subtree) == TreeScope.Subtree &&
Misc.Compare(_refRid, AutomationElement.RootElement.GetRuntimeId()))
{
return(true);
}
// Can only determine if ref element is the element using RuntimeId;
// can't determine other relationships.
if ((_eventListener.TreeScope & TreeScope.Element) == 0)
{
return(false);
}
// Quick look: If they want this element but use our ref RuntimeId
// since the weak reference may be gone.
if (Misc.Compare(rid, _refRid))
{
return(true);
}
// rid is not the ref element
return(false);
}
// WithinScope - returns true if el is within the scope of this listener.
internal bool WithinScope(AutomationElement el)
{
// Quick look: If want all elements then no compare is necessary
if ((_eventListener.TreeScope & TreeScope.Subtree) == TreeScope.Subtree &&
Misc.Compare(_refRid, AutomationElement.RootElement.GetRuntimeId()))
{
return(true);
}
// If our weak reference is still alive, then get it
AutomationElement elThis = AutomationElement;
if (elThis == null)
{
return(false); // reference is no longer alive
}
// Quick look: If they want this element
if ((_eventListener.TreeScope & TreeScope.Element) != 0 && Misc.Compare(el, elThis))
{
return(true);
}
AutomationElement elParent;
// Quick look (sort of): If they want to include children
if (((_eventListener.TreeScope & TreeScope.Children) != 0 || (_eventListener.TreeScope & TreeScope.Descendants) != 0))
{
elParent = TreeWalker.RawViewWalker.GetParent(el);
if (elParent != null && Misc.Compare(elParent, elThis))
{
return(true);
}
}
// Quick look (sort of): If they want to include the parent
if (((_eventListener.TreeScope & TreeScope.Parent) != 0 || (_eventListener.TreeScope & TreeScope.Ancestors) != 0))
{
elParent = TreeWalker.RawViewWalker.GetParent(elThis);
if (elParent != null && Misc.Compare(elParent, el))
{
return(true);
}
}
// More work if they want to include any descendents of this element
if ((_eventListener.TreeScope & TreeScope.Descendants) != 0 && IsChildOf(elThis, el))
{
return(true);
}
// More work if they want to include any anscestors of this element
if ((_eventListener.TreeScope & TreeScope.Ancestors) != 0 && IsChildOf(el, elThis))
{
return(true);
}
return(false);
}
//------------------------------------------------------
//
// Private Methods
//
//------------------------------------------------------
#region Private Methods
// return true if el is a child of elPossibleParent
private bool IsChildOf(AutomationElement elPossibleParent, AutomationElement el)
{
// Do the work [slower] using the proxies
if (!Misc.Compare(el, elPossibleParent))
{
AutomationElement elPossibleChild = TreeWalker.RawViewWalker.GetParent(el);
while (elPossibleChild != null)
{
if (Misc.Compare(elPossibleChild, elPossibleParent))
{
return(true);
}
elPossibleChild = TreeWalker.RawViewWalker.GetParent(elPossibleChild);
}
}
return(false);
}
