GuiArrowButton.cs

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

namespace Loot.UI.Common.Controls.Button
{
    internal class GuiArrowButton : UIElement
    {
        public enum ArrowDirection
        {
            LEFT,
            RIGHT,
            DEFAULT = RIGHT
        }

        private static Texture2D _btnTexture => Assets.Textures.GUI.ArrowButtonTexture;
        public bool CanBeClicked;
        public string HoverText;
        private readonly ArrowDirection _arrowDirection;

        public delegate void WhenClickedEvent(UIMouseEvent evt, UIElement listeningElement, GuiArrowButton btn);
        public event WhenClickedEvent WhenClicked;

        private SpriteEffects GetSpriteEffects()
        {
            switch (_arrowDirection)
            {
                default:
                case ArrowDirection.RIGHT:
                    return SpriteEffects.None;
                case ArrowDirection.LEFT:
                    return SpriteEffects.FlipHorizontally;
            }
        }

        public GuiArrowButton(ArrowDirection direction)
        {
            _arrowDirection = direction;
            Width.Set(_btnTexture.Width, 0);
            Height.Set(_btnTexture.Height, 0);
        }

        public override void OnInitialize()
        {
            OnClick += (evt, element) =>
            {
                if (CanBeClicked)
                {
                    WhenClicked?.Invoke(evt, element, this);
                }
            };
        }

        protected override void DrawSelf(SpriteBatch spriteBatch)
        {
            Color drawColor = Color.Gray * 0.75f;

            var parentBounds = GetOuterDimensions().ToRectangle();

            if (parentBounds.Contains(Main.MouseScreen.ToPoint()))
            {
                if (CanBeClicked)
                {
                    drawColor = Color.White;
                    Main.hoverItemName = HoverText;
                    // This is needed because the current arrows are outside
                    // the UI frame causing vanilla mouse behavior to not register
                    if (Main.mouseLeft && Main.mouseLeftRelease)
                    {
                        Click(new UIMouseEvent(this, Main.MouseScreen));
                    }
                }
            }

            spriteBatch.Draw(
                _btnTexture,
                parentBounds,
                null, drawColor, 0f, Vector2.Zero,
                GetSpriteEffects(), 0f
            );
        }
    }
}