internal SignatureHelpItems(Microsoft.CodeAnalysis.SignatureHelp.SignatureHelpItems inner)
{
Items = inner.Items.Select(x => new SignatureHelpItem(x)).ToArray();
ApplicableSpan = inner.ApplicableSpan;
ArgumentIndex = inner.ArgumentIndex;
ArgumentCount = inner.ArgumentCount;
ArgumentName = inner.ArgumentName;
SelectedItemIndex = inner.SelectedItemIndex;
}
public async Task <SignatureHelpItems> GetItemsAsync(Document document, int position, SignatureHelpTriggerInfo trigger, CancellationToken cancellationToken)
{
Microsoft.CodeAnalysis.SignatureHelp.SignatureHelpItems bestItems = null;
// TODO(cyrusn): We're calling into extensions, we need to make ourselves resilient
// to the extension crashing.
foreach (var provider in _providers)
{
cancellationToken.ThrowIfCancellationRequested();
var currentItems = await provider.GetItemsAsync(document, position, trigger.Inner, cancellationToken).ConfigureAwait(false);
if (currentItems != null && currentItems.ApplicableSpan.IntersectsWith(position))
{
// If another provider provides sig help items, then only take them if they
// start after the last batch of items. i.e. we want the set of items that
// conceptually are closer to where the caret position is. This way if you have:
//
// Foo(new Bar($$
//
// Then invoking sig help will only show the items for "new Bar(" and not also
// the items for "Foo(..."
if (IsBetter(bestItems, currentItems.ApplicableSpan))
{
bestItems = currentItems;
}
}
}
if (bestItems != null)
{
var items = new SignatureHelpItems(bestItems);
if (items.SelectedItemIndex == null)
{
var selection = DefaultSignatureHelpSelector.GetSelection(items.Items, null, false, items.ArgumentIndex, items.ArgumentCount, items.ArgumentName, isCaseSensitive: true);
if (selection.SelectedItem != null)
{
items.SelectedItemIndex = items.Items.IndexOf(selection.SelectedItem);
}
}
return(items);
}
return(null);
}
private static bool IsBetter(Microsoft.CodeAnalysis.SignatureHelp.SignatureHelpItems bestItems, TextSpan?currentTextSpan)
{
return(bestItems == null || currentTextSpan?.Start > bestItems.ApplicableSpan.Start);
}
