private void CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (stack.RollInProgress)
{
return;
}
// We create a transaction at the first change, and complete it at the next dispatcher frame with InvokeAsync
if (currentTransaction == null)
{
currentTransaction = stack.CreateTransaction();
dispatcher.InvokeAsync(CompleteTransaction);
}
if (e.Action == NotifyCollectionChangedAction.Add)
{
PropertySelectionSuppressed = true;
try
{
// When we add a new item to selection, we clear the selection in all other collections
foreach (var scope in scopes.Where(x => !x.Collections.Contains(sender)))
{
foreach (var collection in scope.Collections)
{
var descriptor = TypeDescriptorFactory.Default.Find(collection.GetType()) as CollectionDescriptor;
descriptor?.Clear(collection);
}
}
}
finally
{
PropertySelectionSuppressed = false;
}
}
}
public ITransaction CreateTransaction()
{
var transaction = UndoRedoInProgress ? new DummyTransaction() : stack.CreateTransaction();
transaction.BeforeComplete += TryMergeOperations;
return(transaction);
}
public ITransaction CreateTransaction(TransactionFlags flags = TransactionFlags.None)
{
if (UndoRedoInProgress)
{
return(new DummyTransaction());
}
transactionCompletion = new TaskCompletionSource <int>();
return(stack.CreateTransaction(flags));
}
public ITransaction CreateTransaction()
{
if (UndoRedoInProgress)
{
return(new DummyTransaction());
}
else
{
transactionCompletion = new TaskCompletionSource <int>();
return(stack.CreateTransaction());
}
}
public ITransaction CreateTransaction()
{
return(UndoRedoInProgress ? new DummyTransaction() : stack.CreateTransaction());
}
