GuiTab.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 abstract class GuiTab : UIElement
    {
        internal const int SPACING = GuiUtils.SPACING;
        internal const int PADDING = GuiUtils.PADDING;

        public abstract string Header { get; }
        private int _pageHeight;

        internal int _GetPageHeight()
        {
            _pageHeight = GetPageHeight();
            return _pageHeight;
        }

        public abstract int GetPageHeight();

        public virtual void OnShow()
        {

        }

        public virtual void OnHide()
        {

        }
        internal virtual void ToggleUI(bool visible)
        {
        }

        public virtual void GiveBackItems()
        {

        }

        protected UIElement TabFrame;
        protected static Texture2D _topTexture => Assets.Textures.GUI.PanelTopTexture;
        protected static Texture2D _middleTexture => Assets.Textures.GUI.PanelTileTexture;
        protected static Texture2D _bottomTexture => Assets.Textures.GUI.PanelBottomTexture;

        public int TotalHeight => _topTexture.Height + _pageHeight + _bottomTexture.Height;

        public override void OnInitialize()
        {
            _GetPageHeight();

            Height.Set(_pageHeight + _topTexture.Height + _bottomTexture.Height, 0);
            Width.Set(422, 0);

            TabFrame = new UIElement
            {
                Top = new StyleDimension(SPACING, 0),
                Left = new StyleDimension(SPACING, 0),
                Width = new StyleDimension(Width.Pixels - SPACING * 2, 0),
                Height = new StyleDimension(Height.Pixels - SPACING * 2, 0)
            };
            Append(TabFrame);
        }

        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);
            }

            spriteBatch.Draw(
                _topTexture,
                _topTexture.BoundsFromParent(parentBounds),
                Color.White
            );

            Point offset = new Point(
                0,
                _topTexture.Height
            );

            for (int i = 0; i < _pageHeight; i++)
            {
                spriteBatch.Draw(
                    _middleTexture,
                    _middleTexture.BoundsFromParent(BoundsWithOffset(_middleTexture.Size(), offset)),
                    Color.White
                );
                offset.Y += 1;
            }

            spriteBatch.Draw(
                _bottomTexture,
                _bottomTexture.BoundsFromParent(BoundsWithOffset(_bottomTexture.Size(), offset)),
                Color.White
            );

            //#if DEBUG
            //          spriteBatch.Draw(
            //              Main.magicPixel,
            //              GetOuterDimensions().ToRectangle(),
            //              Color.Blue * 0.4f
            //          );

            //          spriteBatch.Draw(
            //              Main.magicPixel,
            //              TabFrame.GetOuterDimensions().ToRectangle(),
            //              Color.Orange * 0.4f
            //          );
            //#endif
        }
    }
}