/// <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 TextAction PeekIf(TextCursor cursor, TextAction.ActionType type, Func <TextAction, bool> condition)
{
if (UndoActions.Any() && UndoActions.Peek().Match(cursor, type) && condition(UndoActions.Peek()))
{
return(UndoActions.Peek());
}
else
{
return(Add(cursor, type));
}
}
public TextAction PeekOrAdd(TextCursor cursor, TextAction.ActionType type)
{
if (UndoActions.Any() && UndoActions.Peek().Match(cursor, type))
{
return(UndoActions.Peek());
}
else
{
return(Add(cursor, type));
}
}