public void ExecuteCommand(DocumentCommand cmd)
{
cmd.Execute();
if (cmd is UndoableCommand)
{
commandStack.Push(cmd);
}
}
public DocumentInvoker(DocumentCommand discmd, DocumentCommand undcmd, DocumentCommand redcmd)
{
this._discmd = discmd;
this._undcmd = undcmd;
this._redcmd = redcmd;
}