public ISourceTextUndoTransaction RegisterUndoTransaction(SourceText sourceText, string description)
{
if (sourceText != null && !string.IsNullOrWhiteSpace(description))
{
var transaction = new SourceTextUndoTransaction(this, sourceText, description);
_transactions.Add(sourceText, transaction);
return(transaction);
}
return(null);
}
public ISourceTextUndoTransaction RegisterUndoTransaction(SourceText sourceText, string description)
{
if (sourceText != null && !string.IsNullOrWhiteSpace(description))
{
var transaction = new SourceTextUndoTransaction(this, sourceText, description);
_transactions.Add(sourceText, transaction);
return transaction;
}
return null;
}
public bool BeginUndoTransaction(ITextSnapshot snapshot)
{
SourceTextUndoTransaction transaction = null;
var sourceText = snapshot?.AsText();
if (sourceText != null)
{
_transactions.TryGetValue(sourceText, out transaction);
if (transaction != null)
{
return(transaction.Begin(_undoHistoryRegistry?.GetHistory(snapshot.TextBuffer)));
}
}
return(false);
}