/// <summary>
/// Performs an undo action.
/// </summary>
/// <returns>
/// Returns true if the undo action succeeds; otherwise, returns false.
/// </returns>
public bool Undo()
{
bool flag = true;
if (AllowUndo && CanUndo)
{
IUndo undo = UndoList.Peek() as IUndo;
try
{
if ((undo != null) && undo.CanUndo)
{
flag = undo.Undo(Context);
}
}
catch
{
flag = false;
}
if (Context is Excel excel)
{
excel.ResumeInvalidate();
}
if (flag)
{
RedoList.Push(UndoList.Pop());
RaiseChanged(UndoRedoOperation.Undo, undo.ToString());
}
}
return(flag);
}
/// <summary>
/// Undo the last entity change
/// </summary>
public void Undo()
{
_IsInUndoRedoOperation = true;
if (UndoList.Count > 0)
{
// Extract the item from the undo list.
int undoActionId = UndoList.Last().ActionId;
UndoRedoEntityInfo <TEntity> item;
for (int i = UndoList.Count - 1; i >= 0; i--)
{
item = UndoList.Last();
if (item.ActionId == undoActionId)
{
UndoList.RemoveAt(UndoList.Count - 1);
List <UndoRedoEntityInfo <TEntity> > copyRedoList = RedoList.ToList();
copyRedoList.Add(item);
// We need to copy the undo list here.
List <UndoRedoEntityInfo <TEntity> > copyUndoList = UndoList.ToList();
FuncUndo(item);
// Now repopulate the undo and redo lists.
UpdateRedoList(copyRedoList);
UndoList.Clear();
UndoList.AddRange(copyUndoList);
}
}
SetActionId(_ActionId - 1);
}
_IsInUndoRedoOperation = false;
}
/// <summary>
/// Redo the last undone entity change
/// </summary>
/// <remarks>
/// Unlike the undo operation, we don't need to copy the undo list out
/// because we want the item we're redoing being added back to the redo
/// list.
/// </remarks>
public void Redo()
{
_IsInUndoRedoOperation = true;
if (RedoList.Count > 0)
{
// Extract the item from the redo list.
int redoActionId = RedoList.Last().ActionId;
UndoRedoEntityInfo <TEntity> item;
for (int i = RedoList.Count - 1; i >= 0; i--)
{
item = RedoList.Last();
if (item.ActionId == redoActionId)
{
// Now, remove it from the list.
RedoList.RemoveAt(RedoList.Count - 1);
// Here we need to copy the redo list out because
// we will clear the list when the Add is called and
// the Redo is cleared there.
List <UndoRedoEntityInfo <TEntity> > redoList = RedoList.ToList();
//Redo actionId should be the same as undo action id
SetActionId(item.ActionId);
// Redo the last operation.
FuncRedo(item);
// Add the last redo item into undo list
AddUndo(item.ChangedEntity, item.PropertyName, item.OldValue, item.NewValue, item.MessageType);
// Now reset the redo list.
UpdateRedoList(redoList);
}
}
}
_IsInUndoRedoOperation = false;
}
/// <summary>
/// Adds an operation to <see cref="RedoList"/> but without performing it.
/// </summary>
public virtual void AddOperation(IReversibleOperation operation)
{
Assert.ValidateReference(operation);
RedoList.Clear();
UndoList.Insert(0, operation);
LastOperation = null;
}
/// <summary>
/// Adds an operation to <see cref="RedoList"/> and performs it.
/// </summary>
public virtual void AddAndExecuteOperation(IReversibleOperation operation)
{
Assert.ValidateReference(operation);
RedoList.Clear();
UndoList.Insert(0, operation);
operation.Redo();
LastOperation = operation;
}
/// <summary>
/// Adds an operation to <see cref="RedoList"/> but without performing it.
/// </summary>
/// <param name="operation">The operation to add.</param>
public virtual void AddOperation(IReversibleOperation operation)
{
if (operation == null)
{
throw new ArgumentNullException(nameof(operation));
}
RedoList.Clear();
UndoList.Insert(0, operation);
LastOperation = IdentityOperation.Default;
}
public void Redo()
{
if (CanRedo == false)
{
return;
}
UndoList.Push(_value);
_value = RedoList.Pop();
OnPropertyChanged("Value");
OnPropertyChanged("CanUndo");
OnPropertyChanged("CanRedo");
}
public bool Undo()
{
if (UndoSize == 0)
{
return(false);
}
var action = UndoList.Pop();
action.PerformRevertAction();
RedoList.Push(action);
return(true);
}
/// <summary>
/// Removes the first operation in <see cref="UndoList"/>, reverse its effect and adds it to <see cref="RedoList"/>.
/// </summary>
public virtual void Undo()
{
Assert.CheckCondition(UndoList.Count > 0);
IReversibleOperation Operation = UndoList[0];
UndoList.RemoveAt(0);
RedoList.Insert(0, Operation);
Operation.Undo();
LastOperation = Operation;
}
/// <summary>
/// Removes the first operation in <see cref="RedoList"/>, perform it again and adds it to <see cref="UndoList"/>.
/// </summary>
public virtual void Redo()
{
Debug.Assert(RedoList.Count > 0);
IReversibleOperation Operation = RedoList[0];
RedoList.RemoveAt(0);
UndoList.Insert(0, Operation);
Operation.Redo();
LastOperation = Operation;
}
/// <summary>
/// Adds an operation to <see cref="RedoList"/> and performs it.
/// </summary>
/// <param name="operation">The operation to add and execute.</param>
public virtual void AddAndExecuteOperation(IReversibleOperation operation)
{
if (operation == null)
{
throw new ArgumentNullException(nameof(operation));
}
RedoList.Clear();
UndoList.Insert(0, operation);
operation.Redo();
LastOperation = operation;
}
public bool Redo()
{
if (RedoSize == 0)
{
return(false);
}
var action = RedoList.Pop();
action.PerformAction();
UndoList.Push(action);
return(true);
}
public void Redo()
{
if (RedoList.Count > 0)
{
IUndoRedo item = RedoList.First();
RedoList.RemoveFirst();
LinkedList <IUndoRedo> cpyRedo = new LinkedList <IUndoRedo>(RedoList.ToList());
item.Redo();
RedoList = new LinkedList <IUndoRedo>(cpyRedo);
RaisePropertyChanged("RedoDescription");
RaisePropertyChanged("UndoDescription");
}
}
/// <summary>
/// Performs a redo action.
/// </summary>
/// <returns>
/// Returns true if the redo action succeeds; otherwise, returns false.
/// </returns>
public bool Redo()
{
bool flag = true;
if (AllowUndo && CanRedo)
{
ICommand command = RedoList.Peek();
try
{
command.Execute(Context);
}
catch
{
flag = false;
}
if (flag)
{
UndoList.Push(RedoList.Pop());
RaiseChanged(UndoRedoOperation.Redo, command.ToString());
}
}
return(flag);
}
/// <summary>
/// Performs an <see cref="T:Action" /> and adds it to the undo list if the <see cref="T:Action" /> can be undone.
/// </summary>
/// <param name="action">
/// The <see cref="T:Action" />.
/// </param>
public bool Do(ICommand action)
{
if (action == null)
{
return(false);
}
bool flag = true;
try
{
action.Execute(Context);
}
catch
{
flag = false;
}
if (Context is Excel excel)
{
excel.ResumeInvalidate();
}
if (AllowUndo)
{
IUndo undo = action as IUndo;
if (!flag || (undo == null))
{
return(flag);
}
if ((MaxLength > 0) && (UndoList.Count >= MaxLength))
{
ShrinkUndoList((UndoList.Count - MaxLength) + 1);
}
UndoList.Push(action);
RedoList.Clear();
RaiseChanged(UndoRedoOperation.Do, action.ToString());
}
return(flag);
}
/// <summary>
/// Adds a property from the view to the undo list
/// </summary>
/// <param name="entityHashCode">Hash code of the property instance</param>
/// <param name="propertyName">Name of the property</param>
/// <param name="oldValue">Old value of the property</param>
/// <param name="newValue">New value of the property</param>
/// <param name="actionId">Undo/Redo action id</param>
/// <param name="messageType">Action to take when undoing/redoing</param>
public void AddUndo(TEntity changedEntity, string propertyName, object oldValue, object newValue, EntityMessageType messageType)
{
UndoList.Add(new UndoRedoEntityInfo <TEntity>(changedEntity, propertyName, oldValue, newValue, ActionId, messageType));
RedoList.Clear();
}
public void Clear()
{
UndoList.Clear();
RedoList.Clear();
}
/// <summary>
/// Refreshes the redo list with new entries
/// </summary>
/// <param name="redoList"></param>
private void UpdateRedoList(List <UndoRedoEntityInfo <TEntity> > redoList)
{
RedoList.Clear();
RedoList.AddRange(redoList);
}
/// <summary>
/// Returns the manager to a state with no operation that can be performed or reversed.
/// </summary>
public virtual void Reset()
{
UndoList.Clear();
RedoList.Clear();
LastOperation = null;
}
/// <summary>
/// Returns all redo commands.
/// </summary>
public ICommand[] GetRedoList()
{
return(RedoList.ToArray());
}
/// <summary>
/// Returns the manager to a state with no operation that can be performed or reversed.
/// </summary>
public virtual void Reset()
{
UndoList.Clear();
RedoList.Clear();
LastOperation = IdentityOperation.Default;
}
public void ResetUndo()
{
UndoList.Clear();
RedoList.Clear();
}
