UICheckbox.cs

using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using ReLogic.Content;
using System;
using Terraria;
using Terraria.GameContent.UI.Elements;
using Terraria.UI;

namespace AutoTrash
{
	internal class UICheckbox : UIText
	{
		public static Asset<Texture2D> checkboxTexture;
		public static Asset<Texture2D> checkmarkTexture;

		public event EventHandler OnSelectedChanged;

		private bool selected = false;
		private bool disabled = false;
		internal string hoverText;

		public bool Selected {
			get { return selected; }
			set {
				if (value != selected) {
					selected = value;
					OnSelectedChanged?.Invoke(this, EventArgs.Empty);
				}
			}
		}

		public UICheckbox(string text, string hoverText, float textScale = 1, bool large = false) : base(text, textScale, large) {
			this.Left.Pixels += 20;
			//TextColor = Color.Blue;
			text = "   " + text;
			this.hoverText = hoverText;
			SetText(text);
			OnLeftClick += UICheckbox_onLeftClick;
			Recalculate();
		}

		private void UICheckbox_onLeftClick(UIMouseEvent evt, UIElement listeningElement) {
			if (disabled)
				return;
			this.Selected = !Selected;
		}

		public void SetDisabled(bool disabled = true) {
			this.disabled = disabled;
			if (disabled) {
				Selected = false;
			}
			TextColor = disabled ? Color.Gray : Color.White;
		}
		public void SetHoverText(string hoverText) {
			this.hoverText = hoverText;
		}

		protected override void DrawSelf(SpriteBatch spriteBatch) {
			base.DrawSelf(spriteBatch);

			CalculatedStyle innerDimensions = base.GetInnerDimensions();
			Vector2 pos = new Vector2(innerDimensions.X, innerDimensions.Y - 5);

			//Rectangle hitbox = GetInnerDimensions().ToRectangle();
			//Main.spriteBatch.Draw(Main.magicPixel, hitbox, Color.Red * 0.6f);

			spriteBatch.Draw(checkboxTexture.Value, pos, null, disabled ? Color.Gray : Color.White, 0f, Vector2.Zero, 1f, SpriteEffects.None, 0f);
			if (Selected)
				spriteBatch.Draw(checkmarkTexture.Value, pos, null, disabled ? Color.Gray : Color.White, 0f, Vector2.Zero, 1f, SpriteEffects.None, 0f);

			if (IsMouseHovering) {
				Main.hoverItemName = hoverText;
			}
		}
	}
}