GuiUtils.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Terraria.UI;

namespace Loot.Ext
{
    internal static class GuiUtils
    {
        internal const int SPACING = 25;
        internal const int PADDING = 5;

        public static Rectangle BoundsFromParent(this Texture2D texture, Rectangle parentBounds)
        {
            var texBounds = texture.Bounds;
            return new Rectangle(parentBounds.X, parentBounds.Y, texBounds.Width, texBounds.Height);
        }

        public static T RightOf<T>(this T @this, UIElement @that) where T : UIElement
        {
            @this.Left.Set(@that.Left.Pixels + @that.Width.Pixels + PADDING, 0f);
            return @this;
        }

        public static T LeftOf<T>(this T @this, UIElement @that) where T : UIElement
        {
            @this.Left.Set(@that.Left.Pixels - @that.Width.Pixels - PADDING, 0f);
            return @this;
        }

        public static T Below<T>(this T @this, UIElement @that) where T : UIElement
        {
            @this.Top.Set(@that.Top.Pixels + @that.Height.Pixels + PADDING, 0f);
            return @this;
        }

        public static T Above<T>(this T @this, UIElement @that) where T : UIElement
        {
            @this.Top.Set(@that.Top.Pixels - @that.Height.Pixels - PADDING, 0f);
            return @this;
        }
    }
}