void InitializeSignatures(ITrackingSpan applicableToSpan, SignatureHelpResult signatureHelpResult) {
Debug.Assert(signatureHelpResult.Items != null);
signatures.Clear();
foreach (var item in signatureHelpResult.Items.Items) {
bool isSelected = signatureHelpResult.SelectedItem == item;
signatures.Add(new Signature(applicableToSpan, item, isSelected, signatureHelpResult.SelectedParameter));
}
}
void StartSession(SnapshotPoint triggerPosition, SignatureHelpResult signatureHelpResult) {
if (isDisposed || textView.IsClosed) {
Dispose();
return;
}
var triggerPoint = triggerPosition.Snapshot.CreateTrackingPoint(triggerPosition.Position, PointTrackingMode.Negative);
var applicableSpan = signatureHelpResult.Items.ApplicableSpan;
var trackingSpan = CreateApplicableToSpan(triggerPosition, applicableSpan);
InitializeSignatures(trackingSpan, signatureHelpResult);
if (session == null) {
session = signatureHelpBroker.Value.CreateSignatureHelpSession(textView, triggerPoint, trackCaret: false);
session.Dismissed += Session_Dismissed;
session.Properties.AddProperty(sigHelpSessionKey, this);
}
session.Recalculate();
// It's set to null if it got dismissed
if (session == null || session.IsDismissed) {
Debug.Assert(isDisposed);
Dispose();
return;
}
var selectedSig = signatures.FirstOrDefault(a => a.IsSelected);
if (selectedSig != null)
session.SelectedSignature = selectedSig;
}