private static bool SpanStillValid(NavigationBarModel model, ITextSnapshot snapshot, CancellationToken cancellationToken)
{
// even if semantic version is same, portion of text could have been copied & pasted with
// exact same top level content.
// go through spans to see whether this happened.
//
// paying cost of moving spans forward shouldn't be matter since we need to pay that
// price soon or later to figure out selected item.
foreach (var type in model.Types)
{
if (!SpanStillValid(type.TrackingSpans, snapshot))
{
return(false);
}
foreach (var member in type.ChildItems)
{
cancellationToken.ThrowIfCancellationRequested();
if (!SpanStillValid(member.TrackingSpans, snapshot))
{
return(false);
}
}
}
return(true);
}
/// <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.Project.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);
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));
}
/// <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.Project.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);
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);
}