Update TODO

Voile/Source/UI/UIElement.cs

@@ -110,6 +110,60 @@ public abstract class UIElement : IElement, IRenderableElement, IResizeableEleme
     public abstract void Render(RenderSystem renderer, Style style);
     protected abstract void OnUpdate();
 
+    /// <summary>
+    /// Renders a stylebox from a given style.
+    /// </summary>
+    /// <param name="renderer"></param>
+    /// <param name="style"></param>
+    protected void RenderStyleBox(RenderSystem renderer, Style style)
+    {
+        var backgroundColor = style.BackgroundColor;
+        var borderColor = style.BorderColor;
+        var borderSize = style.BorderSize;
+
+        renderer.SetTransform(GlobalPosition, Vector2.Zero);
+
+        renderer.DrawRectangle(new Vector2(Size.Width, Size.Height), backgroundColor);
+
+        if (borderSize.Left > 0)
+        {
+            renderer.SetTransform(GlobalPosition, Vector2.Zero);
+            renderer.DrawRectangle(
+                new Vector2(borderSize.Left, Size.Height),
+                borderColor
+            );
+        }
+
+        if (borderSize.Top > 0)
+        {
+            renderer.SetTransform(GlobalPosition, Vector2.Zero);
+            renderer.DrawRectangle(
+                new Vector2(Size.Width, borderSize.Top),
+                borderColor
+            );
+        }
+
+        if (borderSize.Right > 0)
+        {
+            var rightX = GlobalPosition.X + Size.Width - borderSize.Right;
+            renderer.SetTransform(new Vector2(rightX, GlobalPosition.Y), Vector2.Zero);
+            renderer.DrawRectangle(
+                new Vector2(borderSize.Right, Size.Height),
+                borderColor
+            );
+        }
+
+        if (borderSize.Bottom > 0)
+        {
+            var bottomY = GlobalPosition.Y + Size.Height - borderSize.Bottom;
+            renderer.SetTransform(new Vector2(GlobalPosition.X, bottomY), Vector2.Zero);
+            renderer.DrawRectangle(
+                new Vector2(Size.Width, borderSize.Bottom),
+                borderColor
+            );
+        }
+    }
+
     public void DrawSize(RenderSystem renderer)
     {
         renderer.SetTransform(GlobalPosition, Vector2.Zero);