public TransactionCommand(
HistoryContext context,
string name,
Operation[] operations,
SetSelectionCommand setSelectionCommand)
: base(name)
{
m_context = context;
m_operations = operations;
m_setSelectionCommand = setSelectionCommand;
}
/// <summary>
/// Performs custom actions after a transaction ends</summary>
protected override void OnEnded()
{
if (m_undoingOrRedoing)
return;
if (!m_recording)
return;
DateTime now = DateTime.UtcNow;
TimeSpan elapsed = now.Subtract(m_lastSetOperationTime);
m_lastSetOperationTime = now;
// remove pending set operations if too much time has elapsed
if (elapsed > PendingSetOperationLifetime)
{
m_pendingChanges.Clear();
}
// if operations can be combined with pending set operations, combine and remove them
IList<Operation> operations = TransactionOperations;
int i = 0;
while (i < operations.Count)
{
Operation operation = operations[i];
var setOp = operation as AttributeChangedOperation;
if (setOp != null)
{
var id = new Pair<DomNode, AttributeInfo>(setOp.DomNode, setOp.AttributeInfo);
AttributeChangedOperation pendingSetOp;
if (m_pendingChanges.TryGetValue(id, out pendingSetOp))
{
pendingSetOp.NewValue = setOp.NewValue;
operations.RemoveAt(i);
continue; // don't increment i
}
else
{
m_pendingChanges.Add(id, setOp);
}
}
i++;
}
if (operations.Count > 0)
{
SetSelectionCommand setSelectionCommand = null;
if (m_selectionContext != null)
{
setSelectionCommand = new SetSelectionCommand(
m_selectionContext,
m_lastSelection,
SnapshotSelection());
}
m_history.Add(new TransactionCommand(this, TransactionName, operations.ToArray(), setSelectionCommand));
}
m_lastSelection = null;
base.OnEnded();
}