private void NotifyEditors(NormalizedSnapshotSpanCollection changes, TaggerDelay delay)
{
_tagSource.AssertIsForeground();
if (changes.Count == 0)
{
// nothing to do.
return;
}
if (delay == TaggerDelay.NearImmediate)
{
// if delay is immediate, we let notifier knows about the change right away
_batchChangeNotifier.EnqueueChanges(changes);
return;
}
// if delay is anything more than that, we let notifier knows about the change after given delay
// event notification is only cancellable when disposing of the tagger.
_tagSource.RegisterNotification(
() => _batchChangeNotifier.EnqueueChanges(changes),
(int)delay.ComputeTimeDelay(_subjectBuffer).TotalMilliseconds,
_cancellationTokenSource.Token
);
}
private void OnTagsChangedForBuffer(ICollection <KeyValuePair <ITextBuffer, NormalizedSnapshotSpanCollection> > changes)
{
_tagSource.AssertIsForeground();
// Note: This operation is uncancellable. Once we've been notified here, our cached tags
// in the tag source are new. If we don't update the UI of the editor then we will end
// up in an inconsistent state between us and the editor where we have new tags but the
// editor will never know.
foreach (var change in changes)
{
if (change.Key != _subjectBuffer)
{
continue;
}
// Now report them back to the UI on the main thread.
_batchChangeNotifier.EnqueueChanges(change.Value);
}
}