public SignatureHelpItems(SIGHLP.SignatureHelpItems signatureHelpItems)
{
if (signatureHelpItems == null)
{
throw new ArgumentNullException(nameof(signatureHelpItems));
}
ApplicableSpan = signatureHelpItems.ApplicableSpan;
ArgumentCount = signatureHelpItems.ArgumentCount;
ArgumentIndex = signatureHelpItems.ArgumentIndex;
ArgumentName = signatureHelpItems.ArgumentName;
SelectedItemIndex = signatureHelpItems.SelectedItemIndex;
Items = ToSignatureHelpItem(signatureHelpItems.Items);
}
private bool IsBetter(SignatureHelpItems bestItems, TextSpan? currentTextSpan)
{
// If we have no best text span, then this span is definitely better.
if (bestItems == null)
{
return true;
}
// Otherwise we want the one that is conceptually the innermost signature. So it's
// only better if the distance from it to the caret position is less than the best
// one so far.
return currentTextSpan.Value.Start > bestItems.ApplicableSpan.Start;
}
private static SignatureHelpItem GetSelectedItem(Model currentModel, SignatureHelpItems items, ISignatureHelpProvider provider)
{
// Try to find the most appropriate item in the list to select by default.
// If the provider specified one a selected item, then always stick with that one.
if (items.SelectedItemIndex.HasValue)
{
return items.Items[items.SelectedItemIndex.Value];
}
// If the provider did not pick a default, and it's the same provider as the previous
// model we have, then try to return the same item that we had before.
if (currentModel != null && currentModel.Provider == provider)
{
return items.Items.FirstOrDefault(i => DisplayPartsMatch(i, currentModel.SelectedItem)) ?? items.Items.First();
}
// Otherwise, just pick the first item we have.
return items.Items.First();
}
