/// <summary>
/// Computes a model for the given snapshot.
/// </summary>
private async Task <NavigationBarModel> ComputeModelAsync(Document document, ITextSnapshot snapshot, CancellationToken cancellationToken)
{
// TODO: remove .FirstOrDefault()
var languageService = document.LanguageServices.GetService <INavigationBarItemService>();
if (languageService != null)
{
//// check whether we can re-use lastCompletedModel. otherwise, update lastCompletedModel here.
//// the model should be only updated here
//if (_lastCompletedModel != null)
//{
// var semanticVersion = await document.Project.GetDependentSemanticVersionAsync(CancellationToken.None).ConfigureAwait(false);
// if (_lastCompletedModel.SemanticVersionStamp == semanticVersion && SpanStillValid(_lastCompletedModel, snapshot, cancellationToken))
// {
// // it looks like we can re-use previous model
// return _lastCompletedModel;
// }
//}
//using (Logger.LogBlock(FunctionId.NavigationBar_ComputeModelAsync, cancellationToken))
{
var items = await languageService.GetItemsAsync(document, cancellationToken).ConfigureAwait(false);
if (items != null)
{
items.Do(i => i.InitializeTrackingSpans(snapshot));
//var version = await document.Project.GetDependentSemanticVersionAsync(cancellationToken).ConfigureAwait(false);
//_lastCompletedModel = new NavigationBarModel(items, version, languageService);
_lastCompletedModel = new NavigationBarModel(items, VersionStamp.Default, languageService);
return(_lastCompletedModel);
}
}
}
_lastCompletedModel = _lastCompletedModel ??
new NavigationBarModel(SpecializedCollections.EmptyList <NavigationBarItem>(), new VersionStamp(), null);
return(_lastCompletedModel);
}
internal static NavigationBarSelectedTypeAndMember ComputeSelectedTypeAndMember(NavigationBarModel model, SnapshotPoint caretPosition, CancellationToken cancellationToken)
{
var leftItem = GetMatchingItem(model.Types, caretPosition, model.ItemService, cancellationToken);
if (leftItem.item == null)
{
// Nothing to show at all
return(new NavigationBarSelectedTypeAndMember(null, null));
}
var rightItem = GetMatchingItem(leftItem.item.ChildItems, caretPosition, model.ItemService, cancellationToken);
return(new NavigationBarSelectedTypeAndMember(leftItem.item, leftItem.gray, rightItem.item, rightItem.gray));
}