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));
}
}
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());
}
