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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tango.PPC.Jobs.UndoRedoCommands
{
public sealed class UndoRedoManager
{
private Stack<IUndoRedoCommand> _UndoCommands;
private Stack<IUndoRedoCommand> _RedoCommands;
private bool _isBusy;
private UndoRedoManager()
{
_UndoCommands = new Stack<IUndoRedoCommand>();
_RedoCommands = new Stack<IUndoRedoCommand>();
_isBusy = false;
}
private static readonly Lazy<UndoRedoManager> lazy = new Lazy<UndoRedoManager>(() => new UndoRedoManager());
public static UndoRedoManager Instance
{
get
{
return lazy.Value;
}
}
public void InsertAndExecuteCommand(IUndoRedoCommand command)
{
_UndoCommands.Push(command);
command.Execute();
}
public void Redo()
{
if (!_isBusy)
{
_isBusy = true;
if (_RedoCommands.Count != 0)
{
IUndoRedoCommand command = _RedoCommands.Pop();
command.Execute();
_UndoCommands.Push(command);
}
_isBusy = false;
}
}
public void Undo()
{
if (!_isBusy)
{
_isBusy = true;
if (_UndoCommands.Count != 0)
{
IUndoRedoCommand command = _UndoCommands.Pop();
command.UnExecute();
_RedoCommands.Push(command);
}
_isBusy = false;
}
}
public bool IsEnableUndoOperation()
{
return _UndoCommands.Count() > 0;
}
public bool IsEnableRedoOperation()
{
return _RedoCommands.Count() > 0;
}
public void ClearAll()
{
_UndoCommands.Clear();
_RedoCommands.Clear();
}
}
}
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