private void SubscribeToSharedHierarchyEvents(DocumentId documentId)
{
// Todo: maybe avoid double alerts.
var hostDocument = _workspace.GetHostDocument(documentId);
if (hostDocument == null)
{
return;
}
var hierarchy = hostDocument.Project.Hierarchy;
var itemId = hostDocument.GetItemId();
if (itemId == (uint)VSConstants.VSITEMID.Nil)
{
// the document has been removed from the solution
return;
}
var sharedHierarchy = LinkedFileUtilities.GetSharedHierarchyForItem(hierarchy, itemId);
if (sharedHierarchy != null)
{
uint cookie;
var eventSink = new HierarchyEventsSink(_workspace, sharedHierarchy, documentId);
var hr = sharedHierarchy.AdviseHierarchyEvents(eventSink, out cookie);
if (hr == VSConstants.S_OK && !_documentIdToHierarchyEventsCookieMap.ContainsKey(documentId))
{
_documentIdToHierarchyEventsCookieMap.Add(documentId, cookie);
}
}
}