static SheetBuilder CreateSheetBuilder()
{
var allocated = false;
Func<Sheet> allocate = () =>
{
if (allocated)
throw new SheetOverflowException("");
allocated = true;
return SheetBuilder.AllocateSheet(SheetType.Indexed, Game.Settings.Graphics.SheetSize);
};
return new SheetBuilder(SheetType.Indexed, allocate);
}