Begind creating new layout system.

Dashboard.Common/Drawing/IImmediateMode.cs

@@ -7,7 +7,7 @@ using Dashboard.Pal;
 
 namespace Dashboard.Drawing
 {
-    public record struct RectangleDrawInfo(Vector2 Position, ComputedBox Box, Brush Fill, Brush? Border = null);
+    public record struct RectangleDrawInfo(Vector2 Position, Box2d Box, Brush Fill, Brush? Border = null);
 
     [StructLayout(LayoutKind.Explicit, Size = Size)]
     public struct ImmediateVertex()

Dashboard.Common/Layout/ContainerLayoutInfo.cs

@@ -0,0 +1,117 @@
+using System.ComponentModel;
+using System.Numerics;
+using System.Runtime.CompilerServices;
+
+namespace Dashboard.Layout
+{
+    public class ContainerLayoutInfo : INotifyPropertyChanged
+    {
+        public FlowDirection FlowDirection
+        {
+            get;
+            set => SetField(ref field, value);
+        } = FlowDirection.Row;
+
+        public Extents Padding
+        {
+            get;
+            set => SetField(ref field, value);
+        }
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        public virtual void ValidateLayout(ILayoutContainer container)
+        {
+            if (container.Count == 0)
+                return;
+
+            ItemSolution[] items = [.. container.Select(x => new ItemSolution(x))];
+           
+            // TODO: is this the actual size budget available at draw time?
+            Vector2 budget = container.Layout.ComputedBox.Size - Padding.ExtentSize;
+
+            IEnumerable<ItemSolution> growItems = items.Where(x => x.DisplayMode == DisplayMode.Grow);
+            
+            Vector2 denominator = growItems.Any() 
+                                    ? growItems.Select(x => x.Layout.Size + x.Layout.Margin.ExtentSize)
+                                               .Aggregate((a, b) => a + b)
+                                    : Vector2.One;
+
+            // TODO: The layout engine assumes row layout atm. Implement other layouts.
+
+            for (int i = 0; i < items.Length; i++)
+                items[i].Measure(budget, budget/denominator);
+
+            float fixedWidth = items
+                                .Where(x => x.DisplayMode != DisplayMode.Grow)
+                                .Sum(x => x.DesiredSize.X);
+            
+            float remaining = budget.X - fixedWidth;
+            float star = remaining / denominator.X;
+
+            Vector2 pen = container.Layout.ComputedBox.Min + new Vector2(Padding.Left, Padding.Top);
+            for (int i = 0; i < items.Length; i++)
+            {
+                items[i].Measure(budget, new Vector2(star, budget.Y));
+                items[i].Position = pen;
+                pen.X += items[i].DesiredSize.X;
+
+                items[i].Finish();
+            }
+        }
+
+        private struct ItemSolution(ILayoutItem item)
+        {
+            public ILayoutItem Item { get; } = item;
+            public Vector2 InstrinsicSize { get; } = item.CalculateIntrinsicSize();
+            public Vector2 DesiredSize { get; private set; }
+
+            public readonly LayoutInfo Layout => Item.Layout;
+            public readonly DisplayMode DisplayMode => Item.Layout.DisplayMode;
+
+            public Vector2 Position { get; set; }
+
+            public void Measure(Vector2 budget, Vector2 coefficient)
+            {
+                switch (DisplayMode)
+                {
+                    case DisplayMode.None:
+                        DesiredSize = Vector2.Zero;
+                        break;
+                    case DisplayMode.Fit:
+                        DesiredSize = InstrinsicSize;
+                        break;
+                    case DisplayMode.Fixed:
+                        DesiredSize = Layout.Size;
+                        break;
+                    case DisplayMode.Grow:
+                        DesiredSize = Layout.Size * coefficient;
+                        break;
+                    case DisplayMode.Relative:
+                        DesiredSize = Layout.Size * budget;
+                        break;
+                }
+
+                DesiredSize = Vector2.Clamp(DesiredSize, Layout.MinimumSize, Layout.MaximumSize);
+            }
+
+            public void Finish()
+            {
+                Layout.ComputedBox = new Box2d(Position, Position + DesiredSize);
+            }
+        }
+
+        protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+
+        protected bool SetField<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
+        {
+            if (EqualityComparer<T>.Default.Equals(field, value)) return false;
+            field = value;
+            OnPropertyChanged(propertyName);
+            return true;
+        }
+    }
+}

Dashboard.Common/Layout/ContainerMode.cs

@@ -0,0 +1,9 @@
+namespace Dashboard.Layout
+{
+    public enum ContainerMode
+    {
+        Basic,
+        Flex,
+        Grid,
+    }
+}

Dashboard.Common/Layout/DisplayMode.cs

@@ -0,0 +1,11 @@
+namespace Dashboard.Layout
+{
+    public enum DisplayMode
+    {
+        None,
+        Fit,
+        Grow,
+        Relative,
+        Fixed,
+    }
+}

Dashboard.Common/Layout/FlowDirection.cs

@@ -0,0 +1,10 @@
+namespace Dashboard.Layout
+{
+    public enum FlowDirection
+    {
+        Row,
+        Column,
+        RowReverse,
+        ColumnReverse,
+    }
+}

Dashboard.Common/Layout/ILayoutItem.cs

@@ -11,7 +11,7 @@ namespace Dashboard.Layout
         public Vector2 CalculateSize(Vector2 limits);
     }
 
-    public interface ILayoutContainer : ILayoutItem, IEnumerable<ILayoutItem>
+    public interface ILayoutContainer : ILayoutItem, IReadOnlyList<ILayoutItem>
     {
         public ContainerLayoutInfo ContainerLayout { get; }
     }

Dashboard.Common/Layout/LayoutBox.cs

@@ -1,435 +0,0 @@
-using System.ComponentModel;
-using System.Numerics;
-using System.Runtime.CompilerServices;
-
-namespace Dashboard.Layout
-{
-    public readonly record struct ComputedBox(Vector4 Margin, Vector4 Padding, Vector4 Border, Vector2 Size)
-    {
-        public float MarginLeft => Margin.X;
-        public float MarginTop => Margin.Y;
-        public float MarginRight => Margin.Z;
-        public float MarginBottom => Margin.W;
-
-        public float PaddingLeft => Padding.X;
-        public float PaddingTop => Padding.Y;
-        public float PaddingRight => Padding.Z;
-        public float PaddingBottom => Padding.W;
-
-        public float BorderLeft => Border.X;
-        public float BorderTop => Border.Y;
-        public float BorderRight => Border.Z;
-        public float BorderBottom => Border.W;
-
-        public float Width => Size.X;
-        public float Height => Size.Y;
-
-        public Vector2 BoundingSize => new Vector2(
-            MarginLeft + BorderLeft + Width + BorderRight + MarginRight,
-            MarginTop + BorderTop + Height + BorderBottom + MarginBottom);
-
-        public Vector2 ContentSize => new Vector2(
-            Width - PaddingLeft - PaddingRight,
-            Height - PaddingTop - PaddingBottom);
-
-        public Vector4 ContentExtents => new Vector4(
-            PaddingLeft,
-            PaddingTop,
-            PaddingLeft + PaddingRight + Width,
-            PaddingTop + PaddingBottom + Height);
-
-        public Vector4 CornerRadii { get; init; } = Vector4.Zero;
-    }
-
-    public class LayoutBox : INotifyPropertyChanged
-    {
-        private Vector4 _margin = Vector4.Zero;
-        private Vector4 _padding = Vector4.Zero;
-        private Vector4 _border = Vector4.Zero;
-        private Vector2 _size = Vector2.Zero;
-        private Vector2 _minimumSize = -Vector2.One;
-        private Vector2 _maximumSize = -Vector2.One;
-        private Vector4 _cornerRadii = Vector4.Zero;
-
-        private LayoutUnit _marginLeftUnit = LayoutUnit.Pixel;
-        private LayoutUnit _marginTopUnit = LayoutUnit.Pixel;
-        private LayoutUnit _marginRightUnit = LayoutUnit.Pixel;
-        private LayoutUnit _marginBottomUnit = LayoutUnit.Pixel;
-
-        private LayoutUnit _paddingLeftUnit = LayoutUnit.Pixel;
-        private LayoutUnit _paddingTopUnit = LayoutUnit.Pixel;
-        private LayoutUnit _paddingRightUnit = LayoutUnit.Pixel;
-        private LayoutUnit _paddingBottomUnit = LayoutUnit.Pixel;
-
-        private LayoutUnit _borderLeftUnit = LayoutUnit.Pixel;
-        private LayoutUnit _borderTopUnit = LayoutUnit.Pixel;
-        private LayoutUnit _borderRightUnit = LayoutUnit.Pixel;
-        private LayoutUnit _borderBottomUnit = LayoutUnit.Pixel;
-
-        private LayoutUnit _widthUnit = LayoutUnit.Pixel;
-        private LayoutUnit _heightUnit = LayoutUnit.Pixel;
-
-        private LayoutUnit _minimumWidthUnit = LayoutUnit.Pixel;
-        private LayoutUnit _minimumHeightUnit = LayoutUnit.Pixel;
-
-        private LayoutUnit _maximumWidthUnit = LayoutUnit.Pixel;
-        private LayoutUnit _maximumHeightUnit = LayoutUnit.Pixel;
-
-        private LayoutUnit _cornerRadiusTopLeftUnit = LayoutUnit.Pixel;
-        private LayoutUnit _cornerRadiusBottomLeftUnit = LayoutUnit.Pixel;
-        private LayoutUnit _cornerRadiusBottomRightUnit = LayoutUnit.Pixel;
-        private LayoutUnit _cornerRadiusTopRightUnit = LayoutUnit.Pixel;
-        private ComputedBox _computedBox = new ComputedBox();
-
-        public bool UpdateRequired { get; private set; } = true;
-
-        public Vector4 Margin
-        {
-            get => _margin;
-            set => SetField(ref _margin, value);
-        }
-
-        public Vector4 Padding
-        {
-            get => _padding;
-            set => SetField(ref _padding, value);
-        }
-
-        public Vector4 Border
-        {
-            get => _border;
-            set => SetField(ref _border, value);
-        }
-
-        public Vector2 Size
-        {
-            get => _size;
-            set => SetField(ref _size, value);
-        }
-
-        public Vector2 MinimumSize
-        {
-            get => _minimumSize;
-            set => SetField(ref _minimumSize, value);
-        }
-
-        public Vector2 MaximumSize
-        {
-            get => _maximumSize;
-            set => SetField(ref _maximumSize, value);
-        }
-
-        public Vector4 CornerRadii
-        {
-            get => _cornerRadii;
-            set => SetField(ref _cornerRadii, value);
-        }
-
-        public float MarginLeft
-        {
-            get => Margin.X;
-            set => Margin = Margin with { X = value };
-        }
-
-        public float MarginTop
-        {
-            get => Margin.Y;
-            set => Margin = Margin with { Y = value };
-        }
-
-        public float MarginRight
-        {
-            get => Margin.Z;
-            set => Margin = Margin with { Z = value };
-        }
-
-        public float MarginBottom
-        {
-            get => Margin.W;
-            set => Margin = Margin with { W = value };
-        }
-
-        public float PaddingLeft
-        {
-            get => Padding.X;
-            set => Padding = Padding with { X = value };
-        }
-
-        public float PaddingTop
-        {
-            get => Padding.Y;
-            set => Padding = Padding with { Y = value };
-        }
-
-        public float PaddingRight
-        {
-            get => Padding.Z;
-            set => Padding = Padding with { Z = value };
-        }
-
-        public float PaddingBottom
-        {
-            get => Padding.W;
-            set => Padding = Padding with { W = value };
-        }
-
-        public float BorderLeft
-        {
-            get => Border.X;
-            set => Border = Border with { X = value };
-        }
-
-        public float BorderTop
-        {
-            get => Border.Y;
-            set => Border = Border with { Y = value };
-        }
-
-        public float BorderRight
-        {
-            get => Border.Z;
-            set => Border = Border with { Z = value };
-        }
-
-        public float BorderBottom
-        {
-            get => Border.W;
-            set => Border = Border with { W = value };
-        }
-
-        public float CornerRadiusTopLeft
-        {
-            get => CornerRadii.X;
-            set => CornerRadii = CornerRadii with { X = value };
-        }
-
-        public float CornerRadiusBottomLeft
-        {
-            get => CornerRadii.Y;
-            set => CornerRadii = CornerRadii with { Y = value };
-        }
-
-        public float CornerRadiusBottomRight
-        {
-            get => CornerRadii.Z;
-            set => CornerRadii = CornerRadii with { Z = value };
-        }
-
-        public float CornerRadiusTopRight
-        {
-            get => CornerRadii.W;
-            set => CornerRadii = CornerRadii with { W = value };
-        }
-
-        public LayoutUnit MarginLeftUnit
-        {
-            get => _marginLeftUnit;
-            set => SetField(ref _marginLeftUnit, value);
-        }
-
-        public LayoutUnit MarginTopUnit
-        {
-            get => _marginTopUnit;
-            set => SetField(ref _marginTopUnit, value);
-        }
-
-        public LayoutUnit MarginRightUnit
-        {
-            get => _marginRightUnit;
-            set => SetField(ref _marginRightUnit, value);
-        }
-
-        public LayoutUnit MarginBottomUnit
-        {
-            get => _marginBottomUnit;
-            set => SetField(ref _marginBottomUnit, value);
-        }
-
-        public LayoutUnit PaddingLeftUnit
-        {
-            get => _paddingLeftUnit;
-            set => SetField(ref _paddingLeftUnit, value);
-        }
-
-        public LayoutUnit PaddingTopUnit
-        {
-            get => _paddingTopUnit;
-            set => SetField(ref _paddingTopUnit, value);
-        }
-
-        public LayoutUnit PaddingRightUnit
-        {
-            get => _paddingRightUnit;
-            set => SetField(ref _paddingRightUnit, value);
-        }
-
-        public LayoutUnit PaddingBottomUnit
-        {
-            get => _paddingBottomUnit;
-            set => SetField(ref _paddingBottomUnit, value);
-        }
-
-        public LayoutUnit BorderLeftUnit
-        {
-            get => _borderLeftUnit;
-            set => SetField(ref _borderLeftUnit, value);
-        }
-
-        public LayoutUnit BorderTopUnit
-        {
-            get => _borderTopUnit;
-            set => SetField(ref _borderTopUnit, value);
-        }
-
-        public LayoutUnit BorderRightUnit
-        {
-            get => _borderRightUnit;
-            set => SetField(ref _borderRightUnit, value);
-        }
-
-        public LayoutUnit BorderBottomUnit
-        {
-            get => _borderBottomUnit;
-            set => SetField(ref _borderBottomUnit, value);
-        }
-
-        public LayoutUnit WidthUnit
-        {
-            get => _widthUnit;
-            set => SetField(ref _widthUnit, value);
-        }
-
-        public LayoutUnit HeightUnit
-        {
-            get => _heightUnit;
-            set => SetField(ref _heightUnit, value);
-        }
-
-        public LayoutUnit MinimumWidthUnit
-        {
-            get => _minimumWidthUnit;
-            set => SetField(ref _minimumWidthUnit, value);
-        }
-
-        public LayoutUnit MinimumHeightUnit
-        {
-            get => _minimumHeightUnit;
-            set => SetField(ref _minimumHeightUnit, value);
-        }
-
-        public LayoutUnit MaximumWidthUnit
-        {
-            get => _maximumWidthUnit;
-            set => SetField(ref _maximumWidthUnit, value);
-        }
-
-        public LayoutUnit MaximumHeightUnit
-        {
-            get => _maximumHeightUnit;
-            set => SetField(ref _maximumHeightUnit, value);
-        }
-
-        public LayoutUnit CornerRadiusTopLeftUnit
-        {
-            get => _cornerRadiusTopLeftUnit;
-            set => SetField(ref _cornerRadiusTopLeftUnit, value);
-        }
-
-        public LayoutUnit CornerRadiusBottomLeftUnit
-        {
-            get => _cornerRadiusBottomLeftUnit;
-            set => SetField(ref _cornerRadiusBottomLeftUnit, value);
-        }
-
-        public LayoutUnit CornerRadiusBottomRightUnit
-        {
-            get => _cornerRadiusBottomRightUnit;
-            set => SetField(ref _cornerRadiusBottomRightUnit, value);
-        }
-
-        public LayoutUnit CornerRadiusTopRightUnit
-        {
-            get => _cornerRadiusTopRightUnit;
-            set => SetField(ref _cornerRadiusTopRightUnit, value);
-        }
-
-        public ComputedBox ComputedBox
-        {
-            get => _computedBox;
-            private set => SetField(ref _computedBox, value, false);
-        }
-
-        public event PropertyChangedEventHandler? PropertyChanged;
-
-        public ComputedBox ComputeLayout(Vector2 intrinsic, Vector2 dpi, Vector2 area, Vector2 star)
-        {
-            // TODO: take intrinsic into account.
-            Vector4 margin = Compute(_margin, dpi, area, star, _marginLeftUnit, _marginTopUnit, _marginRightUnit, _marginBottomUnit);
-            Vector4 padding = Compute(_padding, dpi, area, star, _paddingLeftUnit, _paddingTopUnit, _paddingRightUnit, _paddingBottomUnit);
-            Vector4 border = Compute(_border, dpi, area, star, _borderLeftUnit, _borderTopUnit, _borderRightUnit, _borderBottomUnit);
-
-            Vector2 size = Compute(_size, dpi, area, star, _widthUnit, _heightUnit);
-            Vector2 minimumSize = Compute(_minimumSize, dpi, area, star, _minimumWidthUnit, _minimumHeightUnit);
-            Vector2 maximumSize = Compute(_maximumSize, dpi, area, star, _maximumWidthUnit, _maximumHeightUnit);
-            Vector4 cornerRadii = Compute(_cornerRadii, dpi, area, star, _cornerRadiusTopLeftUnit,
-                _cornerRadiusBottomLeftUnit, _cornerRadiusBottomRightUnit, _cornerRadiusTopRightUnit);
-
-            size = Vector2.Clamp(size, minimumSize, maximumSize);
-
-            ComputedBox = new ComputedBox(margin, padding, border, size)
-            {
-                CornerRadii = cornerRadii,
-            };
-
-            UpdateRequired = false;
-            return ComputedBox;
-        }
-
-        private static float Compute(float value, float dpi, float length, float star, LayoutUnit unit)
-        {
-            const float dpiToMm = 0f;
-            const float dpiToPt = 0f;
-
-            return unit switch
-            {
-                LayoutUnit.Pixel => value,
-                LayoutUnit.Millimeter => value * dpi * dpiToMm,
-                LayoutUnit.Percent => value * length,
-                LayoutUnit.Point => value * dpi * dpiToPt,
-                LayoutUnit.Star => value * star,
-                _ => throw new ArgumentException(nameof(unit)),
-            };
-        }
-
-        private static Vector2 Compute(Vector2 value, Vector2 dpi, Vector2 size, Vector2 star, LayoutUnit xUnit, LayoutUnit yUnit)
-        {
-            return new Vector2(
-                Compute(value.X, dpi.X, size.X, star.X, xUnit),
-                Compute(value.Y, dpi.Y, size.Y, star.Y, yUnit));
-        }
-
-        private static Vector4 Compute(Vector4 value, Vector2 dpi, Vector2 size, Vector2 star, LayoutUnit xUnit, LayoutUnit yUnit, LayoutUnit zUnit, LayoutUnit wUnit)
-        {
-            return new Vector4(
-                Compute(value.X, dpi.X, size.X, star.X, xUnit),
-                Compute(value.Y, dpi.Y, size.Y, star.Y, yUnit),
-                Compute(value.Z, dpi.X, size.X, star.X, zUnit),
-                Compute(value.W, dpi.Y, size.Y, star.Y, wUnit));
-        }
-
-
-        private void OnPropertyChanged([CallerMemberName] string? propertyName = null)
-        {
-            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-        }
-
-        private bool SetField<T>(ref T field, T value, bool updateRequired = true, [CallerMemberName] string? propertyName = null)
-        {
-            if (EqualityComparer<T>.Default.Equals(field, value)) return false;
-            field = value;
-            UpdateRequired |= updateRequired;
-            OnPropertyChanged(propertyName);
-            return true;
-        }
-    }
-}

Dashboard.Common/Layout/LayoutInfo.cs

@@ -1,4 +1,3 @@
-using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.ComponentModel;
 using System.Numerics;
@@ -6,68 +5,54 @@ using System.Runtime.CompilerServices;
 
 namespace Dashboard.Layout
 {
-    public enum DisplayMode
+    public class LayoutInfo : INotifyPropertyChanged
     {
-        None,
+        /// <summary>
-        Inline,
+        /// Changes the control display.
-        Block,
+        /// </summary>
-    }
+        public DisplayMode DisplayMode
-
-    public enum ContainerMode
-    {
-        Basic,
-        Flex,
-        Grid,
-    }
-
-    public enum FlowDirection
-    {
-        Row,
-        Column,
-        RowReverse,
-        ColumnReverse,
-    }
-
-    public enum PositionMode
-    {
-        Absolute,
-        Relative,
-    }
-
-    public enum OverflowMode
-    {
-        Hidden,
-        Overflow,
-        ScrollHorizontal,
-        ScrollVertical,
-        ScrollBoth,
-    }
-
-    public record struct TrackInfo(float Width, LayoutUnit Unit)
-    {
-        public static readonly TrackInfo Default = new TrackInfo(0, LayoutUnit.Auto);
-    }
-
-    public class ContainerLayoutInfo : INotifyPropertyChanged
-    {
-        private ContainerMode _containerMode;
-        private FlowDirection _flowDirection = FlowDirection.Row;
-
-        public ObservableCollection<TrackInfo> Rows { get; } = new ObservableCollection<TrackInfo>() { TrackInfo.Default };
-
-        public ObservableCollection<TrackInfo> Columns { get; } =
-            new ObservableCollection<TrackInfo>() { TrackInfo.Default };
-
-        public ContainerMode ContainerMode
         {
-            get => _containerMode;
+            get;
-            set => SetField(ref _containerMode, value);
+            set => SetField(ref field, value);
+        } = DisplayMode.Fit;
+
+        /// <summary>
+        /// Changes how overflows are handled.
+        /// </summary>
+        public OverflowMode OverflowMode
+        {
+            get;
+            set => SetField(ref field, value);
+        } = OverflowMode.Hidden;
+
+        public Vector2 Size
+        {
+            get;
+            set => SetField(ref field, value);
         }
 
-        public FlowDirection FlowDirection
+        public Vector2 MaximumSize
         {
-            get => _flowDirection;
+            get;
-            set => SetField(ref _flowDirection, value);
+            set => SetField(ref field, value);
+        }
+        
+        public Vector2 MinimumSize
+        {
+            get;
+            set => SetField(ref field, value);
+        }
+
+        public Extents Margin 
+        {
+            get;
+            set => SetField(ref field, value);
+        }
+
+        public Box2d ComputedBox
+        { 
+            get;
+            set => SetField(ref field, value);
         }
 
         public event PropertyChangedEventHandler? PropertyChanged;
@@ -85,87 +70,4 @@ namespace Dashboard.Layout
             return true;
         }
     }
-
-    public class LayoutInfo : INotifyPropertyChanged
-    {
-        private DisplayMode _displayMode = DisplayMode.Inline;
-        private PositionMode _positionMode = PositionMode.Relative;
-        private OverflowMode _overflowMode = OverflowMode.Overflow;
-        private int _row = 0;
-        private int _column = 0;
-
-        /// <summary>
-        /// Changes the control display.
-        /// </summary>
-        public DisplayMode DisplayMode
-        {
-            get => _displayMode;
-            set => SetField(ref _displayMode, value);
-        }
-
-        /// <summary>
-        /// Changes how the control is positioned.
-        /// </summary>
-        public PositionMode PositionMode
-        {
-            get => _positionMode;
-            set => SetField(ref _positionMode, value);
-        }
-
-        /// <summary>
-        /// Changes how overflows are handled.
-        /// </summary>
-        public OverflowMode OverflowMode
-        {
-            get => _overflowMode;
-            set => SetField(ref _overflowMode, value);
-        }
-
-        public LayoutBox Box { get; } = new LayoutBox();
-
-        /// <summary>
-        /// The row of the control in a grid container.
-        /// </summary>
-        public int Row
-        {
-            get => _row;
-            set => SetField(ref _row, value);
-        }
-
-        /// <summary>
-        /// The column of the control in a grid container.
-        /// </summary>
-        public int Column
-        {
-            get => _column;
-            set => SetField(ref _column, value);
-        }
-
-        public event PropertyChangedEventHandler? PropertyChanged;
-
-        public LayoutInfo()
-        {
-            Box.PropertyChanged += BoxOnPropertyChanged;
-            // Rows.CollectionChanged    += RowsChanged;
-            // Columns.CollectionChanged += ColumnsChanged;
-        }
-
-        private void BoxOnPropertyChanged(object? sender, PropertyChangedEventArgs e)
-        {
-            OnPropertyChanged(nameof(Box));
-        }
-
-        protected virtual void OnPropertyChanged([CallerMemberName] string? propertyName = null)
-        {
-            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
-        }
-
-        private bool SetField<T>(ref T field, T value, [CallerMemberName] string? propertyName = null)
-        {
-            if (EqualityComparer<T>.Default.Equals(field, value)) return false;
-            field = value;
-            OnPropertyChanged(propertyName);
-            return true;
-        }
-    }
 }

Dashboard.Common/Layout/LayoutSolution.cs

@@ -1,364 +0,0 @@
-using System.Numerics;
-
-namespace Dashboard.Layout
-{
-    public record struct LayoutItemSolution(ILayoutItem Item, ComputedBox Solution);
-
-    public class LayoutSolution
-    {
-        public ILayoutContainer Container { get; }
-        public IReadOnlyList<LayoutItemSolution> Items { get; }
-
-        private LayoutSolution(ILayoutContainer container, IEnumerable<LayoutItemSolution> itemSolutions)
-        {
-            Container = container;
-            Items = itemSolutions.ToList().AsReadOnly();
-        }
-
-        public static LayoutSolution CalculateLayout<T1>(T1 container, Vector2 limits, int iterations = 3, float absTol = 0.001f, float relTol = 0.01f)
-            where T1 : ILayoutContainer
-        {
-            switch (container.ContainerLayout.ContainerMode)
-            {
-                default:
-                case ContainerMode.Basic:
-                    return SolveForBasicLayout(container, limits, iterations, absTol, relTol);
-                case ContainerMode.Flex:
-                    return SolveForFlex(container, limits, iterations, absTol, relTol);
-                case ContainerMode.Grid:
-                    return SolveForGrid(container, limits, iterations, absTol, relTol);
-            }
-        }
-
-        private static LayoutSolution SolveForGrid<T1>(T1 container, Vector2 limits, int iterations, float absTol, float relTol) where T1 : ILayoutContainer
-        {
-            throw new NotImplementedException();
-        }
-
-        private static LayoutSolution SolveForFlex<T1>(T1 container, Vector2 limits,int iterations, float absTol, float relTol) where T1 : ILayoutContainer
-        {
-            throw new NotImplementedException();
-        }
-
-        private static LayoutSolution SolveForBasicLayout<T1>(T1 container, Vector2 limits, int iterations, float absTol, float relTol) where T1 : ILayoutContainer
-        {
-            int count = container.Count();
-            LayoutItemSolution[] items = new LayoutItemSolution[count];
-
-            int i = 0;
-            foreach (ILayoutItem item in container)
-            {
-                items[i++] = new LayoutItemSolution(item, default);
-            }
-
-            bool limitX = limits.X > 0;
-            bool limitY = limits.Y > 0;
-
-            while (iterations-- > 0)
-            {
-                Vector2 pen = Vector2.Zero;
-
-                i = 0;
-                foreach (ILayoutItem item in container)
-                {
-                    Vector2 size = item.CalculateIntrinsicSize();
-
-                }
-            }
-
-            return new LayoutSolution(container, items);
-        }
-
-        private record TrackSolution(TrackInfo Track)
-        {
-            public bool Auto => Track.Unit == LayoutUnit.Auto;
-
-            public bool Absolute => Track.Unit.IsAbsolute();
-
-            public float Requested { get; private set; }
-            public float Value { get; private set; }
-
-            public float Result { get; set; } = 0.0f;
-            public bool IsFrozen { get; set; } = false;
-
-            public void CalculateRequested(float dpi, float rel, float star)
-            {
-                Requested = new Metric(Track.Unit, Track.Width).Compute(dpi, rel, star);
-            }
-
-            public void Freeze()
-            {
-                if (IsFrozen)
-                    return;
-
-                IsFrozen = true;
-                Result = Value;
-            }
-        }
-
-        private delegate float GetItemLength<in T1>(float dpi, float rel, float star, T1 item)
-            where T1 : ILayoutItem;
-
-        private TrackSolution[] SolveForGridTracks<T1, T2, T3>(
-            float limit,
-            T1 tracks,
-            T2 container,
-            int iterations,
-            float absTol,
-            float relTol,
-            Func<int, T3> getItemTrack,
-            GetItemLength<T3> getItemLength)
-            where T1 : IList<TrackInfo>
-            where T2 : ILayoutContainer
-            where T3 : ILayoutItem
-        {
-            int itemCount = container.Count();
-            bool auto = limit < 0;
-            TrackSolution[] solution = new TrackSolution[tracks.Count];
-
-            foreach (TrackSolution track in solution)
-            {
-                if (track.Absolute) {
-                    // FIXME: pass DPI here.
-                    track.CalculateRequested(96f, limit, 0);
-                    track.Freeze();
-                }
-            }
-
-            while (iterations-- > 0)
-            {
-            }
-
-            for (int i = 0; i < tracks.Count; i++)
-            {
-                solution[i].Freeze();
-            }
-
-            return solution;
-        }
-
-        // private static void GetIntrinsicGridSizes<T1, T2>(Span<float> cols, Span<float> rows, T1 parent, T2 items)
-        //     where T1 : ILayoutItem
-        //     where T2 : IEnumerable<ILayoutItem>
-        // {
-        //     CopyToSpan(rows, parent.Layout.Rows);
-        //     CopyToSpan(cols, parent.Layout.Columns);
-        //
-        //     foreach (ILayoutItem item in items)
-        //     {
-        //         int col = Math.Clamp(item.Layout.Column, 0, cols.Length - 1);
-        //         int row = Math.Clamp(item.Layout.Row, 0, rows.Length - 1);
-        //
-        //         bool autoCols = parent.Layout.Columns[col] < 0;
-        //         bool autoRows = parent.Layout.Rows[row] < 0;
-        //
-        //         if (!autoRows && !autoCols)
-        //             continue;
-        //
-        //         Vector2 size = item.CalculateIntrinsicSize();
-        //         cols[col] = autoCols ? Math.Max(size.X, cols[col]) : cols[col];
-        //         rows[row] = autoRows ? Math.Max(size.Y, rows[row]) : rows[row];
-        //     }
-        // }
-        //
-        // public static Vector2 CalculateIntrinsicSize<T1, T2>(T1 parent, T2 items)
-        //     where T1 : ILayoutItem
-        //     where T2 : IEnumerable<ILayoutItem>
-        // {
-        //     // Copy layout details.
-        //     Span<float> cols = stackalloc float[parent.Layout.Columns.Count];
-        //     Span<float> rows = stackalloc float[parent.Layout.Rows.Count];
-        //
-        //     GetIntrinsicGridSizes(cols, rows, parent, items);
-        //
-        //     float width = parent.Layout.Margin.X + parent.Layout.Margin.Z + parent.Layout.Padding.X + parent.Layout.Padding.Z + SumSpan<float>(cols);
-        //     float height = parent.Layout.Margin.Y + parent.Layout.Margin.W + parent.Layout.Padding.Y + parent.Layout.Padding.W + SumSpan<float>(rows);
-        //
-        //     return new Vector2(width, height);
-        // }
-        //
-        // public static GridResult Layout<T1, T2>(T1 parent, T2 items, Vector2 limits, int iterations = 3, float abstol = 0.0001f, float reltol = 0.01f)
-        //     where T1 : ILayoutItem
-        //     where T2 : IEnumerable<ILayoutItem>
-        // {
-        //     Vector4 contentSpace = parent.Layout.Margin + parent.Layout.Padding;
-        //     Vector2 contentLimits = new Vector2(
-        //         limits.X > 0 ? limits.X - contentSpace.X - contentSpace.Z : -1,
-        //         limits.Y > 0 ? limits.Y - contentSpace.Y - contentSpace.W : -1);
-        //
-        //     // Get rows and columns for now.
-        //     Span<Track> cols = stackalloc Track[parent.Layout.Columns.Count];
-        //     Span<Track> rows = stackalloc Track[parent.Layout.Rows.Count];
-        //
-        //     for (int i = 0; i < cols.Length; i++)
-        //     {
-        //         cols[i] = new Track(parent.Layout.Columns[i]);
-        //
-        //         if (!cols[i].Auto)
-        //         {
-        //             cols[i].Freeze();
-        //         }
-        //     }
-        //
-        //     for (int i = 0; i < rows.Length; i++)
-        //     {
-        //         rows[i] = new Track(parent.Layout.Rows[i]);
-        //
-        //         if (!rows[i].Auto)
-        //         {
-        //             rows[i].Freeze();
-        //         }
-        //     }
-        //
-        //     int freeRows = 0;
-        //     int freeCols = 0;
-        //     while (iterations-- > 0 && ((freeRows = CountFree(rows)) > 0 || (freeCols = CountFree(cols)) > 0))
-        //     {
-        //         // Calculate the remaining size.
-        //         Vector2 remaining = contentLimits;
-        //
-        //         for (int i = 0; contentLimits.X > 0 && i < cols.Length; i++)
-        //         {
-        //             if (cols[i].IsFrozen)
-        //                 remaining.X -= cols[i].Value;
-        //         }
-        //
-        //         for (int i = 0; contentLimits.Y > 0 && i < rows.Length; i++)
-        //         {
-        //             if (rows[i].IsFrozen)
-        //                 remaining.Y -= rows[i].Value;
-        //         }
-        //
-        //         Vector2 childLimits = remaining / new Vector2(Math.Max(freeCols, 1), Math.Max(freeRows, 1));
-        //
-        //
-        //         // Calculate the size of each free track.
-        //         foreach (ILayoutItem child in items)
-        //         {
-        //             int c = Math.Clamp(child.Layout.Column, 0, cols.Length - 1);
-        //             int r = Math.Clamp(child.Layout.Row, 0, rows.Length - 1);
-        //
-        //             bool autoRow = rows[r].Auto;
-        //             bool autoCol = cols[c].Auto;
-        //
-        //             if (!autoRow && !autoCol)
-        //                 continue;
-        //
-        //             Vector2 childSize = child.CalculateSize(childLimits);
-        //
-        //             if (autoCol)
-        //                 cols[c].Value = Math.Max(childLimits.X, childSize.X);
-        //
-        //             if (autoRow)
-        //                 rows[r].Value = Math.Max(childLimits.Y, childSize.Y);
-        //         }
-        //
-        //         // Calculate for errors and decide to freeze them.
-        //
-        //         for (int i = 0; limits.X > 0 && i < cols.Length; i++)
-        //         {
-        //             if (WithinTolerance(cols[i].Value, childLimits.X, abstol, reltol))
-        //             {
-        //                 cols[i].Freeze();
-        //             }
-        //         }
-        //
-        //         for (int i = 0; limits.Y > 0 && i < rows.Length; i++)
-        //         {
-        //             if (WithinTolerance(rows[i].Value, childLimits.Y, abstol, reltol))
-        //             {
-        //                 rows[i].Freeze();
-        //             }
-        //         }
-        //     }
-        //
-        //     Vector2 size = new Vector2(
-        //         parent.Layout.Margin.X + parent.Layout.Margin.Z + parent.Layout.Padding.X + parent.Layout.Padding.Z,
-        //         parent.Layout.Margin.Y + parent.Layout.Margin.W + parent.Layout.Padding.Y + parent.Layout.Padding.W);
-        //
-        //     foreach (ref Track col in cols)
-        //     {
-        //         col.Freeze();
-        //         size.X += col.Result;
-        //     }
-        //
-        //     foreach (ref Track row in rows)
-        //     {
-        //         row.Freeze();
-        //         size.Y += row.Result;
-        //     }
-        //
-        //     if (limits.X > 0) size.X = Math.Max(size.X, limits.X);
-        //     if (limits.Y > 0) size.Y = Math.Max(size.Y, limits.Y);
-        //
-        //     // Temporary solution
-        //     return new GridResult(size, cols.ToArray().Select(x => x.Result).ToArray(), rows.ToArray().Select(x => x.Result).ToArray());
-        //
-        //     static int CountFree(Span<Track> tracks)
-        //     {
-        //         int i = 0;
-        //         foreach (Track track in tracks)
-        //         {
-        //             if (!track.IsFrozen)
-        //                i++;
-        //         }
-        //
-        //         return i;
-        //     }
-        // }
-        //
-        // private static void CopyToSpan<T1, T2>(Span<T1> span, T2 items)
-        //     where T2 : IEnumerable<T1>
-        // {
-        //     using IEnumerator<T1> iterator = items.GetEnumerator();
-        //     for (int i = 0; i < span.Length; i++)
-        //     {
-        //         if (!iterator.MoveNext())
-        //             break;
-        //
-        //         span[i] = iterator.Current;
-        //     }
-        // }
-        //
-        // private static T1 SumSpan<T1>(ReadOnlySpan<T1> span)
-        //     where T1 : struct, INumber<T1>
-        // {
-        //     T1 value = default;
-        //
-        //     foreach (T1 item in span)
-        //     {
-        //         value += item;
-        //     }
-        //
-        //     return value;
-        // }
-        //
-        // private static bool WithinTolerance<T>(T value, T limit, T abstol, T reltol)
-        //     where T : INumber<T>
-        // {
-        //     T tol = T.Max(abstol, value * reltol);
-        //     return T.Abs(value - limit) < tol;
-        // }
-        //
-        // public record GridResult(Vector2 Size, float[] Columns, float[] Rows)
-        // {
-        //
-        // }
-        //
-        // private record struct Track(float Request)
-        // {
-        //     public bool Auto => Request < 0;
-        //
-        //     public bool IsFrozen { get; private set; } = false;
-        //     public float Value { get; set; } = Request;
-        //
-        //     public float Result { get; private set; }
-        //
-        //     public void Freeze()
-        //     {
-        //         Result = Value;
-        //         IsFrozen = true;
-        //     }
-        // }
-    }
-}

Dashboard.Common/Layout/OverflowMode.cs

@@ -0,0 +1,11 @@
+namespace Dashboard.Layout
+{
+    public enum OverflowMode
+    {
+        Hidden,
+        Overflow,
+        ScrollHorizontal,
+        ScrollVertical,
+        ScrollBoth,
+    }
+}

Dashboard.Common/LayoutExtensions.cs

@@ -0,0 +1,130 @@
+using System.Numerics;
+using Dashboard.Layout;
+
+namespace Dashboard
+{
+    public static class LayoutExtensions
+    {
+        extension<T>(T item)
+            where T : ILayoutItem
+        {
+            public DisplayMode DisplayMode
+            {
+                get => item.Layout.DisplayMode;
+                set => item.Layout.DisplayMode = value;
+            }
+
+            public OverflowMode OverflowMode
+            {
+                get => item.Layout.OverflowMode;
+                set => item.Layout.OverflowMode = value;
+            }
+
+            public Vector2 Size
+            {
+                get => item.Layout.Size;
+                set => item.Layout.Size = value;
+            }
+
+            public float Width
+            {
+                get => item.Size.X;
+                set => item.Size = new Vector2(value, item.Size.Y);
+            }
+
+            public float Height
+            {
+                get => item.Size.Y;
+                set => item.Size = new Vector2(item.Size.X, value);
+            }
+
+            public Vector2 MaximumSize
+            {
+                get => item.Layout.MaximumSize;
+                set => item.Layout.MaximumSize = value;
+            }
+
+            public float MaximumWidth
+            {
+                get => item.MaximumSize.X;
+                set => item.MaximumSize = new Vector2(value, item.MaximumSize.Y);
+            }
+
+            public float MaximumHeight
+            {
+                get => item.MaximumSize.Y;
+                set => item.MaximumSize = new Vector2(item.MaximumSize.X, value);
+            }
+
+            public Vector2 MinimumSize
+            {
+                get => item.Layout.MinimumSize;
+                set => item.Layout.MinimumSize = value;
+            }
+
+            public float MinimumWidth
+            {
+                get => item.MinimumSize.X;
+                set => item.MinimumSize = new Vector2(value, item.MinimumSize.Y);
+            }
+
+            public float MinimumHeight
+            {
+                get => item.MinimumSize.Y;
+                set => item.MinimumSize = new Vector2(item.MinimumSize.X, value);
+            }
+
+            public Extents Margin
+            {
+                get => item.Layout.Margin;
+                set => item.Layout.Margin = value;
+            }
+
+            public float MarginLeft
+            {
+                get => item.Layout.Margin.Left;
+                set => item.Layout.Margin = new Extents(value, item.MarginTop, item.MarginRight, item.MarginBottom);
+            }
+
+            public float MarginTop
+            {
+                get => item.Layout.Margin.Top;
+                set => item.Layout.Margin = new Extents(item.MarginLeft, value, item.MarginRight, item.MarginBottom);
+            }
+
+            public float MarginRight
+            {
+                get => item.Layout.Margin.Right;
+                set => item.Layout.Margin = new Extents(item.MarginLeft, item.MarginTop, value, item.MarginBottom);
+            }
+
+            public float MarginBottom
+            {
+                get => item.Layout.Margin.Bottom;
+                set => item.Layout.Margin = new Extents(item.MarginLeft, item.MarginTop, item.MarginRight, value);
+            }
+
+            public Box2d ComputedBox
+            {
+                get => item.Layout.ComputedBox;
+                set => item.Layout.ComputedBox = value;
+            }
+        }
+
+        extension<T> (T item)
+            where T : ILayoutContainer
+        {
+            public FlowDirection FlowDirection
+            {
+                get => item.ContainerLayout.FlowDirection;
+                set => item.ContainerLayout.FlowDirection = value;
+            }
+
+            public Extents Padding
+            {
+                get => item.ContainerLayout.Padding;
+                set => item.ContainerLayout.Padding = value;
+            }
+        }
+    }
+}

Dashboard.OpenGL/Drawing/ImmediateMode.cs

@@ -127,10 +127,8 @@ namespace Dashboard.OpenGL.Drawing
             int z = Context.ExtensionRequire<IDeviceContextBase>().IncrementZ();
             Color color = (rectangle.Fill as SolidColorBrush)?.Color ?? Color.LightGray;
             Vector4 colorV = new Vector4(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
-            Vector4 margin = rectangle.Box.Margin;
+            Vector2 size = rectangle.Box.Size;
-            Vector4 border = rectangle.Box.Border;
+            Box2d box = Box2d.FromPositionAndSize(rectangle.Position, size);
-            Vector2 size = rectangle.Box.Size + new Vector2(border.X + border.Z, border.Y = border.W);
-            Box2d box = Box2d.FromPositionAndSize(rectangle.Position + new Vector2(margin.X + border.X, margin.Y + border.Y), size);
 
             Rectangle(box, z, colorV);
         }

Dashboard/Controls/Container.cs

@@ -18,6 +18,8 @@ namespace Dashboard.Controls
 
         public ContainerLayoutInfo ContainerLayout { get; } = new ContainerLayoutInfo();
 
+        ILayoutItem IReadOnlyList<ILayoutItem>.this[int index] => _controls[index];
+
         public event EventHandler<ContainerChildAddedEventArgs>? ChildAdded;
         public event EventHandler<ContainerChildRemovedEventArgs>? ChildRemoved;
 
@@ -33,7 +35,10 @@ namespace Dashboard.Controls
             if (!IsLayoutEnabled || IsLayoutValid)
                 return;
 
-            // LayoutSolution solution = LayoutSolution.CalculateLayout(this, ClientArea.Size);
+            ContainerLayout.ValidateLayout(this);
+            
+            foreach (var child in this)
+                child.InvalidateLayout();
 
             base.ValidateLayout();
         }

Dashboard/Controls/Control.cs

@@ -1,8 +1,8 @@
 using System;
 using System.ComponentModel;
-using System.Diagnostics;
 using System.Drawing;
 using System.Numerics;
+using System.Runtime.CompilerServices;
 using Dashboard.Drawing;
 using Dashboard.Events;
 using Dashboard.Layout;
@@ -29,7 +29,7 @@ namespace Dashboard.Controls
 
         public Control? Parent { get; private set; } = null;
         public bool Disposed { get; private set; }
-        public virtual Box2d ClientArea { get; set; }
+        public virtual Box2d ClientArea => Layout.ComputedBox;
         public bool IsFocused => _owner?.FocusedControl == this;
 
         public Brush Background { get; set; } = new SolidColorBrush(Color.Transparent);
@@ -39,6 +39,7 @@ namespace Dashboard.Controls
         public bool IsLayoutEnabled { get; private set; } = true;
         protected bool IsLayoutValid { get; set; } = false;
 
+        public event PropertyChangedEventHandler? PropertyChanged;
         public event EventHandler<DeviceContext>? Painting;
         public event EventHandler<TickEventArgs>? AnimationTick;
         public event EventHandler? OwnerChanged;
@@ -175,7 +176,18 @@ namespace Dashboard.Controls
             IsLayoutValid = false;
         }
 
+        protected void SetField<T>(ref T field, T value, [CallerMemberName]string name = "")
+        {
+            field = value;
+            if (!string.IsNullOrEmpty(name))
+                OnPropertyChanged(name);
+        }
+
+        protected virtual void OnPropertyChanged(string name)
+        {
+            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(name));
+        }
+
         protected static Exception NoOwnerException => new Exception("No form owns this control");
-        public event PropertyChangedEventHandler? PropertyChanged;
     }
 }

Dashboard/Controls/Form.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Drawing;
+using System.Numerics;
 using Dashboard.Drawing;
 using Dashboard.Events;
 using Dashboard.Pal;
@@ -23,13 +24,11 @@ namespace Dashboard.Controls
                 Window.Title = _title ?? "";
             }
         }
-        public Brush Background { get; set; } = new SolidColorBrush(Color.SlateGray);
         public Control? FocusedControl { get; private set; } = null;
 
         public override Box2d ClientArea
         {
             get => new Box2d(0, 0, Window.ClientSize.Width, Window.ClientSize.Height);
-            set { }
         }
 
         public event EventHandler<WindowCloseEvent>? Closing;
@@ -37,9 +36,18 @@ namespace Dashboard.Controls
         public Form(IWindow window)
         {
             Window = window;
-            window.Form = this;
+            Window.Form = this;
-
             Window.Title = _title;
+            Window.EventRaised += WindowEventRaised;
+            Background = new SolidColorBrush(Color.SlateGray);
+        }
+
+        private void WindowEventRaised(object? sender, EventArgs e)
+        {
+            if (e is ResizeEventArgs)
+            {
+                InvalidateLayout();
+            }
         }
 
         public void Focus(Control control)
@@ -65,6 +73,11 @@ namespace Dashboard.Controls
             if (Background is SolidColorBrush solidColorBrush)
                 dcb.ClearColor(solidColorBrush.Color);
 
+            if (!IsLayoutValid)
+            {
+                ValidateLayout();
+            }
+
             foreach (Control child in this)
                 child.SendEvent(this, new PaintEventArgs(dc));
 

Dashboard/Controls/Label.cs

@@ -29,9 +29,7 @@ namespace Dashboard.Controls
         protected void CalculateSize(DeviceContext dc)
         {
             Box2d box = dc.ExtensionRequire<ITextRenderer>().MeasureText(Font.Base, TextSize, Text);
-            // _intrinsicSize = box.Size;
+            _intrinsicSize = box.Size;
-            // Layout.Size = box.Size;
-            // ClientArea = new Box2d(ClientArea.Min, ClientArea.Min + Layout.Size);
         }
 
         public override void OnPaint(DeviceContext dc)

Dashboard/Controls/MessageBox.cs

@@ -2,8 +2,9 @@ using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Collections.ObjectModel;
-using System.Collections.Specialized;
+using System.Drawing;
 using System.IO;
+using System.Numerics;
 using System.Reflection;
 using Dashboard.Drawing;
 using Dashboard.Windowing;
@@ -36,12 +37,11 @@ namespace Dashboard.Controls
     /// </summary>
     public class MessageBox : Form
     {
-        private MessageBoxIcon _icon;
         private MessageBoxButtons _buttons;
-        private ImageBox _iconBox = new ImageBox();
+        private readonly ImageBox _iconBox = new ImageBox();
-        private Label  _label = new Label();
+        private readonly Label  _label = new Label();
-        private Container _main = new Container();
+        private readonly Container _main = new Container();
-        private Container _buttonsContainer = new Container();
+        private readonly Container _buttonsContainer = new Container();
 
         private Image? IconImage
         {
@@ -51,7 +51,7 @@ namespace Dashboard.Controls
 
         public MessageBoxIcon Icon
         {
-            get => _icon;
+            get;
             set
             {
                 IconImage = value switch
@@ -63,7 +63,7 @@ namespace Dashboard.Controls
                     _ => null,
                 };
 
-                _icon = value;
+                field = value;
             }
         }
 
@@ -82,7 +82,7 @@ namespace Dashboard.Controls
         public string? Message
         {
             get => _label.Text;
-            set => _label.Text = value ?? String.Empty;
+            set => _label.Text = value ?? string.Empty;
         }
 
         public MessageBoxButtons Buttons
@@ -99,21 +99,24 @@ namespace Dashboard.Controls
 
         public MessageBox(IWindow window) : base(window)
         {
-            // Layout.Rows.Clear();
+            Add(_main);
-            // Layout.Rows.Add(-1);
+            _main.DisplayMode = Dashboard.Layout.DisplayMode.Grow;
-            // Layout.Rows.Add(48);
+            _main.Size = Vector2.One;
-            //
+            _main.FlowDirection = Dashboard.Layout.FlowDirection.Row;
-            // Add(_main);
+            _main.Padding = new Extents(4f);
-            // _main.Layout.Columns.Clear();
-            // _main.Layout.Columns.Add(48);
-            // _main.Layout.Columns.Add(-1);
 
             _main.Add(_iconBox);
+            _iconBox.Size = new Vector2(72f);
+            _iconBox.Margin = new Extents(0f, 4f, 2f, 0f);
+            _iconBox.Background = new SolidColorBrush(Color.Purple);
+            
             _main.Add(_label);
-            _label.Layout.Column = 1;
+            _label.DisplayMode = Dashboard.Layout.DisplayMode.Fit;
+            _iconBox.Margin = new Extents(2f, 4f, 0f, 0f);
+            _iconBox.Background = new SolidColorBrush(Color.Black);
 
             Add(_buttonsContainer);
-            _buttonsContainer.Layout.Row = 1;
+            _buttonsContainer.Padding = new Extents(2f, 4f, 2f, 4f);
 
             CustomButtons.CollectionChanged += (sender, ea) => UpdateButtons();
 
@@ -139,19 +142,19 @@ namespace Dashboard.Controls
                 _ => s_ok,
             };
 
-            // _buttonsContainer.Clear();
+            _buttonsContainer.Clear();
-            // _buttonsContainer.Layout.Columns.Clear();
+            for (int i = 0; i < list.Count; i++)
-            // for (int i = 0; i < list.Count; i++)
+            {
-            // {
+                string str = list[i];
-            //     _buttonsContainer.Layout.Columns.Add(-1);
+
-            //     string str = list[i];
+                Button button = new Button() { Text = str };
-            //
+                button.Clicked += (sender, ea) => ButtonClicked(sender, ea, i);
-            //     Button button = new Button() { Text = str };
+                button.Layout.Margin = new Extents(2f, 0f, 2f, 0f);
-            //     button.Clicked += (sender, ea) => ButtonClicked(sender, ea, i);
+                // button.Layout.Column = i;
-            //     button.Layout.Column = i;
+                _buttonsContainer.Add(button);
-            //     _buttonsContainer.Add(button);
+                button.Background = new SolidColorBrush(Color.Red);
-            //     Add(button);
+                // Add(button);
-            // }
+            }
         }
 
         private void ButtonClicked(object? sender, EventArgs ea, int i)

tests/Dashboard.TestApplication/Program.cs

@@ -3,15 +3,14 @@ using Dashboard.BlurgText;
 using Dashboard.BlurgText.OpenGL;
 using Dashboard.Controls;
 using Dashboard.Drawing;
-using Dashboard.Events;
 using Dashboard.OpenGL;
 using Dashboard.OpenTK.PAL2;
 using Dashboard.Pal;
 using Dashboard.StbImage;
-using OpenTK.Graphics.OpenGL;
 using OpenTK.Mathematics;
 using OpenTK.Platform;
 using TK = OpenTK.Platform.Toolkit;
+
 Application app = new Pal2Application(new ToolkitOptions()
 {
     ApplicationName = "DashTerm",
@@ -57,59 +56,16 @@ window.Title = "DashTerm";
 TK.Window.SetMinClientSize(window.WindowHandle, 300, 200);
 TK.Window.SetClientSize(window.WindowHandle, new Vector2i(320, 240));
 TK.Window.SetBorderStyle(window.WindowHandle, WindowBorderStyle.ResizableBorder);
-// TK.Window.SetTransparencyMode(wnd, WindowTransparencyMode.TransparentFramebuffer, 0.1f);
 
 GLDeviceContext context = (GLDeviceContext)window.DeviceContext;
 
 context.GLContext.MakeCurrent();
 context.GLContext.SwapGroup.SwapInterval = 1;
 
-GL.Disable(EnableCap.DepthTest);
-GL.Enable(EnableCap.Blend);
-GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
-GL.ColorMask(true, true, true, true);
-
 TK.Window.SetMode(window.WindowHandle, WindowMode.Normal);
 
 window.DeviceContext.ExtensionRequire<IDeviceContextBase>().ScaleOverride = 1.5f;
 
-IDirectRendering direct = window.DeviceContext.ExtensionRequire<IDirectRendering>();
-IImmediateMode imm = window.DeviceContext.ExtensionRequire<IImmediateMode>();
-ImmediateVertex[] vertices = new ImmediateVertex[]
-{                                                   //  x,     y,     z,                                                               r, g, b, a
-        new ImmediateVertex(new System.Numerics.Vector3(-0.5f, -0.5f, 0.0f), System.Numerics.Vector2.Zero, new System.Numerics.Vector4(1, 0, 0, 1)),
-        new ImmediateVertex(new System.Numerics.Vector3(+0.5f, -0.5f, 0.0f), System.Numerics.Vector2.Zero, new System.Numerics.Vector4(0, 1, 0, 1)),
-        new ImmediateVertex(new System.Numerics.Vector3(+0.0f, +0.5f, 0.0f), System.Numerics.Vector2.Zero, new System.Numerics.Vector4(0, 0, 1, 1)),
-};
-
-
-window.EventRaised += (sender, eventArgs) =>
-{
-    if (eventArgs is not PaintEventArgs paint)
-        return;
-
-    // window.DeviceContext.Begin();
-    var dcb = window.DeviceContext.ExtensionRequire<IDeviceContextBase>();
-    dcb.ResetTransforms();
-    dcb.ClearDepth();
-
-    imm.Rectangle(
-        new Dashboard.Box2d(
-            new System.Numerics.Vector2(30, 30),
-            new System.Numerics.Vector2(140, 110)),
-        0.2f,
-        new System.Numerics.Vector4(1, 1, 0, 1));
-    imm.Line(
-        new System.Numerics.Vector2(180, 40),
-        new System.Numerics.Vector2(290, 180),
-        6,
-        0.2f,
-        new System.Numerics.Vector4(0, 1, 1, 1));
-    imm.DrawImmediate(new ImmediateDrawCall(MeshPrimitive.Triangle, vertices.AsMemory()));
-
-    // window.DeviceContext.End();
-};
-
 app.Run(true, source.Token);