/// <summary>
        /// Update
        /// </summary>
        public override void Update()
        {
            base.Update();
            ConcurrentBag <TextSprite> text_sprite_bag = new ConcurrentBag <TextSprite>();

            ForEachComponent <TextSprite>((text_sprite) =>
            {
                text_sprite_bag.Add(text_sprite);
            });
            TextSprite[] text_sprites = text_sprite_bag.ToArray();
            while (sprites.Count > text_sprites.Length)
            {
                int index = sprites.Count - 1;
                window.RemoveControl(sprites[index]);
                sprites.RemoveAt(index);
            }
            for (int i = 0; i < text_sprites.Length; i++)
            {
                ColoredTextField sprite;
                TextSprite       text_sprite         = text_sprites[i];
                RectTransform    rectangle_transform = text_sprite.GetComponent <RectTransform>();
                if (i < sprites.Count)
                {
                    sprite = sprites[i];
                }
                else
                {
                    if (rectangle_transform == null)
                    {
                        sprite = window.AddControl <ColoredTextField>(RectInt.zero);
                    }
                    else
                    {
                        sprite = window.AddControl <ColoredTextField>(rectangle_transform.Position - CameraPosition, rectangle_transform.Size);
                    }
                    sprite.AllowTransparency = true;
                    sprites.Add(sprite);
                }
                if (rectangle_transform == null)
                {
                    sprite.IsVisible = false;
                }
                else
                {
                    sprite.Text      = text_sprite.Text;
                    sprite.Position  = rectangle_transform.Position - CameraPosition;
                    sprite.Size      = rectangle_transform.Size;
                    sprite.IsVisible = true;
                }
            }
        }