/// <summary>
/// Undo the number of actions specified by <paramref name="count"/>.
/// </summary>
/// <param name="count">The number of actions to undo.</param>
public void Undo(int count = 1)
{
lock (LockObject)
{
if (count > UndoActions.Count)
{
throw new ArgumentOutOfRangeException("Can't undo the number of actions specified.", nameof(count));
}
IsUndoing = true;
for (var i = 0; i < count; i++)
{
// Get the next action to undo.
var action = UndoActions.Peek();
OnBeforeUndo(new UndoEventArgs(action));
action.Undo();
// Add the action to the redo stack.
RedoActions.Push(UndoActions.Pop());
OnAfterUndo(new UndoEventArgs(action));
}
IsUndoing = false;
OnChanged(EventArgs.Empty);
}
}
public bool Undo(out TextCursor cursor)
{
cursor = null;
if (!UndoActions.Any())
{
return(false);
}
var action = UndoActions.Pop();
cursor = action.Cursor;
cursor.Undo(action);
RedoActions.Push(action);
return(UndoActions.Any());
}