///-------------------------------------------------------------------------------------------------
/// <summary>
/// Initializes a new instance of the <see cref="UndoManager" /> class.
/// </summary>
/// <param name="store">
/// The store.
/// </param>
/// <param name="capacity">
/// (Optional)
/// </param>
///-------------------------------------------------------------------------------------------------
public UndoManager(IHyperstore store, int capacity = 100)
{
Contract.Requires(store, "store");
Contract.Requires(capacity > 0, "capacity");
_store = store;
_domainModels = new Dictionary <string, DomainInfo>(StringComparer.OrdinalIgnoreCase);
_undos = new RecursiveStack <SessionEvents>(capacity);
_redos = new RecursiveStack <SessionEvents>(capacity);
Capacity = capacity;
}
private void PerformPop(RecursiveStack <SessionEvents> mainStack, RecursiveStack <SessionEvents> altStack, SessionMode mode, int?toSavePoint)
{
var notify = false;
lock (_sync)
{
int sid = 0;
var events = new List <IUndoableEvent>();
using (var session = _store.BeginSession(new SessionConfiguration {
Mode = mode
}))
{
IEventDispatcher dispatcher = null;
string domainModelName = null;
while (mainStack.Count > 0)
{
if (toSavePoint != null && mainStack.Peek().SessionId == toSavePoint)
{
break;
}
var ci = mainStack.Pop();
foreach (var @event in Enumerable.Reverse(ci.Events))
{
var evt = @event.GetReverseEvent(session.SessionId);
if (evt == null)
{
continue;
}
if (domainModelName != evt.Domain)
{
dispatcher = _domainModels[evt.Domain].Dispatcher;
domainModelName = evt.Domain;
}
dispatcher.HandleEvent(evt);
if (evt is IUndoableEvent)
{
events.Add(evt as IUndoableEvent);
}
}
sid = ci.SessionId;
if (toSavePoint == null)
{
break;
}
}
session.AcceptChanges();
}
if (events.Count > 0)
{
notify = true;
altStack.Push(new SessionEvents
{
SessionId = sid,
Events = events.ToList()
});
}
}
if (notify)
{
OnPropertyChanged("CanUndo");
OnPropertyChanged("CanRedo");
}
}
