UIButtonChoice.cs

using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Input;
using Terraria;
using Terraria.Localization;
using Terraria.ModLoader;
using Terraria.UI;

namespace MagicStorage
{
    public class UIButtonChoice : UIElement
    {
        private const int buttonSize = 32;
        private const int buttonPadding = 8;

        private Texture2D[] buttons;
        private LocalizedText[] names;
        private int choice = 0;

        public int Choice
        {
            get
            {
                return choice;
            }
        }

        public UIButtonChoice(Texture2D[] buttons, LocalizedText[] names)
        {
            if (buttons.Length != names.Length || buttons.Length == 0)
            {
                throw new ArgumentException();
            }
            this.buttons = buttons;
            this.names = names;
            int width = buttonSize * buttons.Length + buttonPadding * (buttons.Length - 1);
            this.Width.Set(width, 0f);
            this.MinWidth.Set(width, 0f);
            this.Height.Set(buttonSize, 0f);
            this.MinHeight.Set(buttonSize, 0f);
        }

        public override void Update(GameTime gameTime)
        {
            int oldChoice = choice;
            if (StorageGUI.MouseClicked && Parent != null)
            {
                for (int k = 0; k < buttons.Length; k++)
                {
                    if (MouseOverButton(StorageGUI.curMouse.X, StorageGUI.curMouse.Y, k))
                    {
                        choice = k;
                        break;
                    }
                }
            }
            if (oldChoice != choice)
            {
                StorageGUI.RefreshItems();
            }
        }

        private bool MouseOverButton(int mouseX, int mouseY, int button)
        {
            Rectangle dim = InterfaceHelper.GetFullRectangle(this);
            float left = dim.X + button * (buttonSize + buttonPadding) * Main.UIScale;
            float right = left + buttonSize * Main.UIScale;
            float top = dim.Y;
            float bottom = top + buttonSize * Main.UIScale;
            return mouseX > left && mouseX < right && mouseY > top && mouseY < bottom;
        }

        protected override void DrawSelf(SpriteBatch spriteBatch)
        {
            Texture2D backTexture = MagicStorage.Instance.GetTexture("SortButtonBackground");
            Texture2D backTextureActive = MagicStorage.Instance.GetTexture("SortButtonBackgroundActive");
            CalculatedStyle dim = GetDimensions();
            for (int k = 0; k < buttons.Length; k++)
            {
                Texture2D texture = k == choice ? backTextureActive : backTexture;
                Vector2 drawPos = new Vector2(dim.X + k * (buttonSize + buttonPadding), dim.Y);
                Color color = MouseOverButton(StorageGUI.curMouse.X, StorageGUI.curMouse.Y, k) ? Color.Silver : Color.White;
                Main.spriteBatch.Draw(texture, drawPos, color);
                Main.spriteBatch.Draw(buttons[k], drawPos + new Vector2(1f), Color.White);
            }
        }

        public void DrawText()
        {
            for (int k = 0; k < buttons.Length; k++)
            {
                if (MouseOverButton(StorageGUI.curMouse.X, StorageGUI.curMouse.Y, k))
                {
                    Main.instance.MouseText(names[k].Value);
                }
            }
        }
    }
}