/// <summary>
/// The main execution method to decouple actions. Track
/// commands in this method if you need to Undo or Redo actions.
/// </summary>
public void Execute(ICommand command)
{
command.Execute();
UndoneCommands.Clear();
RedoneCommands.Clear();
Commands.Push(command);
}
/// <summary>
/// Method to redo actions if needed.
/// </summary>
public void Redo()
{
ICommand command;
UndoneCommands.TryPop(out command);
if (command == null)
{
return;
}
command.Redo();
RedoneCommands.Push(command);
}
/// <summary>
/// Method to purge all commands from the manager object
/// to avoid stack overflow. Use as needed from top level
/// tracking objects. Might be worth calling every 50
/// usages, etc to free up memory.
/// </summary>
public void PurgeCommands()
{
if (RedoneCommands.Count > MaximumCommandStackSize)
{
var commands = RedoneCommands.Take(MaximumCommandStackSize).Reverse().ToArray();
RedoneCommands.Clear();
RedoneCommands.PushRange(commands);
}
if (UndoneCommands.Count > MaximumCommandStackSize)
{
var commands = UndoneCommands.Skip(MaximumCommandStackSize).ToArray();
UndoneCommands.Clear();
UndoneCommands.TryPopRange(commands);
}
if (Commands.Count > MaximumCommandStackSize)
{
var commands = Commands.Take(MaximumCommandStackSize).Reverse().ToArray();
Commands.Clear();
Commands.PushRange(commands);
}
}
/// <summary>
/// Method to clear all commands from the manager object
/// to avoid stack overflow. Use when done. Once this
/// is called, Undo and Redo context should be gone
/// along with all executed commands.
/// </summary>
public void ClearCommands()
{
RedoneCommands.Clear();
UndoneCommands.Clear();
Commands.Clear();
}
