UI WIP

DaggerFramework/Source/UI/Container.cs

@@ -0,0 +1,63 @@
+using System.Numerics;
+using DaggerFramework.Rendering;
+
+namespace DaggerFramework.UI;
+
+/// <summary>
+/// A basic container for UI elements. All container's children will update their constraints based on container's sizing and positioning.
+/// </summary>
+public class Container : UIElement
+{
+    /// <summary>
+    /// Updates the sizes of the container and rearranges its children.
+    /// </summary>
+    /// <param name="position"></param>
+    /// <param name="size"></param>
+    public void UpdateRect(Vector2 position, Vector2 size)
+    {
+        Rect.Position = position;
+
+        UpdateSize(size);
+        RearrangeChildren();
+    }
+
+    protected void RearrangeChildren()
+    {
+        int idx = 0;
+        foreach (var child in children)
+        {
+            if (child is Container container)
+            {
+                container.UpdateRect(Rect.Position, Rect.Size);
+            }
+            RearrangeChild(idx, child);
+            idx++;
+        }
+    }
+
+    protected virtual void RearrangeChild(int idx, UIElement child) { }
+
+    protected override void OnRender(Renderer renderer)
+    {
+
+    }
+
+    private void UpdateSize(Vector2 baseSize)
+    {
+        if (parent == null)
+        {
+            Rect.Size = baseSize;
+            return;
+        }
+
+        if (VerticalSizeFlags == SizeFlags.Fill)
+        {
+            Rect.Size = new Vector2(Rect.Size.X, baseSize.Y * ExpandRatio.Y);
+        }
+
+        if (HorizontalSizeFlags == SizeFlags.Fill)
+        {
+            Rect.Size = new Vector2(baseSize.X * ExpandRatio.X, Rect.Size.Y);
+        }
+    }
+}