public static void Undo()
{
if (UndoCommands.Count > 0)
{
ICommand temp = UndoCommands.Peek();
temp.Undo();
RedoCommands.Push(temp);
UndoCommands.Pop();
}
}
public static void Redo()
{
if (RedoCommands.Count > 0)
{
ICommand temp = RedoCommands.Peek();
temp.Execute();
UndoCommands.Push(temp);
RedoCommands.Pop();
}
}
/// <summary>
/// Adds the specified command to the command manager.
/// </summary>
/// <param name="command">The command.</param>
public void Add(Command command)
{
// Throw an exception if there are no command.
if (command == null)
{
throw new ArgumentNullException("command");
}
// Adding a command automatically purges the redo list.
RedoCommands.Clear();
// Check to see if there are any undo commands. If there isn't
// any undo commands, then we don't add it to the undo list.
if (command.UndoOperations.Count > 0)
{
UndoCommands.Push(command);
}
}