//--------------------------------------------------------------------------------------------------
public void AddTopologyChange(TopologyAction topologyAction, IUndoableTopology container, Entity instance)
{
// We save every change, so we can rewind it later step by step
var action = new TopologyUndoAction(container.Guid);
if (action.Set(instance, container, topologyAction))
{
_PendingActions.Add(action);
}
}
//--------------------------------------------------------------------------------------------------
public bool Set(Entity child, IUndoableTopology container, UndoHandler.TopologyAction action)
{
_ChildGuid = child.Guid;
InstanceGuid = container.Guid;
_ParentGuid = null;
var parent = container.GetParent(child);
if (parent != null)
{
_ParentGuid = parent.Guid;
}
_TopoAction = action;
_StoredData = null;
switch (action)
{
case UndoHandler.TopologyAction.Added:
// Counter-Action: Remove. We need only the instance to get it removed later.
return(true);
case UndoHandler.TopologyAction.Removed:
// Counter-Action: Add. We need the instance, the parent and its data to add it later.
var data = Serializer.Serialize(child, new SerializationContext(SerializationScope.UndoRedo));
if (!data.IsNullOrEmpty())
{
_StoredData = data;
//Debug.WriteLine(_StoredData);
return(true);
}
break;
case UndoHandler.TopologyAction.Moved:
// Counter-Action: Move back. We need instance and parent.
return(true);
}
return(false);
}
//--------------------------------------------------------------------------------------------------
public UndoHandler(IUndoableTopology document)
{
_Document = document;
_UndoStack = new LimitedStack <UndoAction[]>(500);
_RedoStack = new LimitedStack <UndoAction[]>(500);
}
