UIPanel.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using ReLogic.Content;
using Terraria.UI;
 
namespace Terraria.GameContent.UI.Elements;
 
public class UIPanel : UIElement
{
    private int _cornerSize = 12;
 
    private int _barSize = 4;
 
    private Asset<Texture2D> _borderTexture;
 
    private Asset<Texture2D> _backgroundTexture;
 
    public Color BorderColor = Color.Black;
 
    public Color BackgroundColor = new Color(63, 82, 151) * 0.7f;
 
    public UIPanel()
    {
        if (_borderTexture == null)
        {
            _borderTexture = Main.Assets.Request<Texture2D>("Images/UI/PanelBorder", (AssetRequestMode)1);
        }
        if (_backgroundTexture == null)
        {
            _backgroundTexture = Main.Assets.Request<Texture2D>("Images/UI/PanelBackground", (AssetRequestMode)1);
        }
        SetPadding(_cornerSize);
    }
 
    public UIPanel(Asset<Texture2D> customBackground, Asset<Texture2D> customborder, int customCornerSize = 12, int customBarSize = 4)
    {
        if (_borderTexture == null)
        {
            _borderTexture = customborder;
        }
        if (_backgroundTexture == null)
        {
            _backgroundTexture = customBackground;
        }
        _cornerSize = customCornerSize;
        _barSize = customBarSize;
        SetPadding(_cornerSize);
    }
 
    private void DrawPanel(SpriteBatch spriteBatch, Texture2D texture, Color color)
    {
        CalculatedStyle dimensions = GetDimensions();
        Point point = new Point((int)dimensions.X, (int)dimensions.Y);
        Point point2 = new Point(point.X + (int)dimensions.Width - _cornerSize, point.Y + (int)dimensions.Height - _cornerSize);
        int width = point2.X - point.X - _cornerSize;
        int height = point2.Y - point.Y - _cornerSize;
        spriteBatch.Draw(texture, new Rectangle(point.X, point.Y, _cornerSize, _cornerSize), new Rectangle(0, 0, _cornerSize, _cornerSize), color);
        spriteBatch.Draw(texture, new Rectangle(point2.X, point.Y, _cornerSize, _cornerSize), new Rectangle(_cornerSize + _barSize, 0, _cornerSize, _cornerSize), color);
        spriteBatch.Draw(texture, new Rectangle(point.X, point2.Y, _cornerSize, _cornerSize), new Rectangle(0, _cornerSize + _barSize, _cornerSize, _cornerSize), color);
        spriteBatch.Draw(texture, new Rectangle(point2.X, point2.Y, _cornerSize, _cornerSize), new Rectangle(_cornerSize + _barSize, _cornerSize + _barSize, _cornerSize, _cornerSize), color);
        spriteBatch.Draw(texture, new Rectangle(point.X + _cornerSize, point.Y, width, _cornerSize), new Rectangle(_cornerSize, 0, _barSize, _cornerSize), color);
        spriteBatch.Draw(texture, new Rectangle(point.X + _cornerSize, point2.Y, width, _cornerSize), new Rectangle(_cornerSize, _cornerSize + _barSize, _barSize, _cornerSize), color);
        spriteBatch.Draw(texture, new Rectangle(point.X, point.Y + _cornerSize, _cornerSize, height), new Rectangle(0, _cornerSize, _cornerSize, _barSize), color);
        spriteBatch.Draw(texture, new Rectangle(point2.X, point.Y + _cornerSize, _cornerSize, height), new Rectangle(_cornerSize + _barSize, _cornerSize, _cornerSize, _barSize), color);
        spriteBatch.Draw(texture, new Rectangle(point.X + _cornerSize, point.Y + _cornerSize, width, height), new Rectangle(_cornerSize, _cornerSize, _barSize, _barSize), color);
    }
 
    protected override void DrawSelf(SpriteBatch spriteBatch)
    {
        if (_backgroundTexture != null)
        {
            DrawPanel(spriteBatch, _backgroundTexture.Value, BackgroundColor);
        }
        if (_borderTexture != null)
        {
            DrawPanel(spriteBatch, _borderTexture.Value, BorderColor);
        }
    }
}