public void Add(IAction action)
{
if (action is Node)
{
Group grp = (Group)action;
if (grp.Actions.Count == 1)
{
action = grp.Actions[0];
}
else if (grp.Actions.Count == 0)
{
return;
}
}
if (d_actions.Count - d_unmodifiedMark < d_actionPtr)
{
d_unmodifiedMark = -1;
}
IAction last = LastAction;
if (last != null && last.CanMerge(action))
{
last.Merge(action);
}
else
{
d_actions.RemoveRange(0, d_actionPtr);
d_actions.Insert(0, action);
d_actionPtr = 0;
OnChanged(this);
if (d_actions.Count == 1)
{
OnModified(this);
}
}
}