Add ConfineToChildren to Container, containers will use MinimumRect as a size if a given size is smaller than minimum, update documentation for Container.

TestGame/TestGame.cs

@@ -127,6 +127,7 @@ public class TestGame : Game
 
     private FlexContainer _container = new(minimumSize: new Rect(64.0f, 64.0f), new())
     {
+        ConfineToContents = false,
         Size = new Rect(500, 300),
         Direction = FlexDirection.Row,
         Justify = JustifyContent.Start,

Voile/Source/UI/Containers/Container.cs

@@ -21,6 +21,17 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
         set
         {
             _size = value;
+
+            if (value.Width < MinimumRect.Width)
+            {
+                _size.Width = MinimumRect.Width;
+            }
+
+            if (value.Height < MinimumRect.Height)
+            {
+                _size.Height = MinimumRect.Height;
+            }
+
             MarkDirty();
         }
     }
@@ -29,6 +40,11 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
     /// <inheritdoc />
     public bool Dirty => _isDirty;
 
+    /// <summary>
+    /// Specifies if this <see cref="Container"/>'s minimum size will be confined to contents.
+    /// </summary>
+    public bool ConfineToContents { get; set; } = false;
+
     public Container()
     {
         MarkDirty();
@@ -62,7 +78,11 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
         }
 
         Arrange();
-        CalculateMinimumSize();
+
+        if (ConfineToContents)
+        {
+            RecalculateSizes();
+        }
     }
 
     public void MarkDirty() => _isDirty = true;
@@ -73,16 +93,11 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
     public abstract void Arrange();
 
     /// <summary>
-    /// Recalculates a minimum size for this <see cref="Container"/>.
+    /// Recalculates sizes for this <see cref="Container"/>.
+    /// This is done automatically if <see cref="ConfineToContents"/> is true.
     /// </summary>
-    public void CalculateMinimumSize()
+    public void RecalculateSizes()
     {
-        if (Children.Count == 0)
-        {
-            _size = MinimumRect;
-            return;
-        }
-
         float minX = float.MaxValue;
         float minY = float.MaxValue;
         float maxX = float.MinValue;
@@ -108,6 +123,11 @@ public abstract class Container : IElement, IParentableElement, IUpdatableElemen
         float finalHeight = MathF.Max(occupiedHeight, MinimumRect.Height);
 
         MinimumRect = new Rect(finalWidth, finalHeight);
+
+        if (MinimumRect > _size)
+        {
+            _size = MinimumRect;
+        }
     }
 
     public void AddChild(IElement child)

Voile/Source/UI/Rect.cs

@@ -5,5 +5,19 @@ namespace Voile.UI;
 /// </summary>
 public record Rect(float Width = 0.0f, float Height = 0.0f)
 {
+    public float Width { get; set; } = Width;
+    public float Height { get; set; } = Height;
     public static Rect Zero => new Rect(0.0f, 0.0f);
+    public float Area => Width * Height;
+
+    public int CompareTo(Rect? other)
+    {
+        if (other is null) return 1;
+        return Area.CompareTo(other.Area);
+    }
+
+    public static bool operator >(Rect left, Rect right) => left.CompareTo(right) > 0;
+    public static bool operator <(Rect left, Rect right) => left.CompareTo(right) < 0;
+    public static bool operator >=(Rect left, Rect right) => left.CompareTo(right) >= 0;
+    public static bool operator <=(Rect left, Rect right) => left.CompareTo(right) <= 0;
 }