private async Task UpdateDescription()
{
if (descriptionWindow != null)
{
descriptionWindow.Destroy();
descriptionWindow = null;
}
descriptionCts.Cancel();
if (SelectedItemIndex == -1)
{
return;
}
var completionItem = SelectedItem;
descriptionCts = new CancellationTokenSource();
var token = descriptionCts.Token;
TooltipInformation description = null;
try {
var document = _subjectBuffer.CurrentSnapshot.GetOpenDocumentInCurrentContextWithChangesSafe();
description = await RoslynCompletionData.CreateTooltipInformation(document, completionItem, false, token);
} catch {
}
if (token.IsCancellationRequested)
{
return;
}
if (descriptionWindow != null)
{
descriptionWindow.Destroy();
descriptionWindow = null;
}
if (description == null)
{
return;
}
var window = new TooltipInformationWindow();
window.AddOverload(description);
descriptionWindow = window;
ShowDescription();
}
void HideDescription()
{
Runtime.CheckMainThread();
descriptionCts.Cancel();
descriptionCts = new CancellationTokenSource();
if (descriptionWindow != null)
{
descriptionWindow.Destroy();
descriptionWindow = null;
}
}