GuiCloseButton.cs

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using Loot.Ext;
using Loot.UI.Common;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria;
using Terraria.UI;

namespace Loot.UI
{
    internal class GuiCloseButton : UIElement
    {
        public override void OnInitialize()
        {
            Width.Set(Assets.Textures.GUI.CloseButtonTexture.Width, 0);
            Height.Set(Assets.Textures.GUI.CloseButtonTexture.Height, 0);
            Top.Set(20 + Assets.Textures.GUI.CloseButtonChainsTexture.Height, 0);
            Left.Set(422, 0);
        }

        protected override void DrawSelf(SpriteBatch spriteBatch)
        {
            var parentBounds = GetOuterDimensions().ToRectangle();
            Rectangle BoundsWithOffset(Vector2 bounds, Point off)
            {
                return new Rectangle(parentBounds.X + off.X, parentBounds.Y + off.Y, (int)bounds.X, (int)bounds.Y);
            }

            var _btn = Assets.Textures.GUI.CloseButtonTexture;
            spriteBatch.Draw(
                _btn,
                parentBounds,
                Color.White
            );

            var _chains = Assets.Textures.GUI.CloseButtonChainsTexture;
            Point offset = new Point(
                0,
                -_chains.Height
            );

            Rectangle rectangle = _chains.BoundsFromParent(BoundsWithOffset(_chains.Size(), offset));
            spriteBatch.Draw(
                _chains,
                rectangle,
                Color.White
            );

            if (parentBounds.Contains(Main.MouseScreen.ToPoint()))
            {
                Main.hoverItemName = "Close";
                if (Main.mouseLeft && Main.mouseLeftRelease)
                {
                    Loot.Instance.GuiState.ToggleUI(Loot.Instance.GuiInterface);
                }
            }
        }
    }
}