Unfinished work I want to document in the Git history.

Dashboard.BlurgText.OpenGL/BlurgGLExtension.cs

@@ -41,35 +41,6 @@ namespace Dashboard.BlurgText.OpenGL
             Dispose(false);
         }
 
-        public BlurgFontProxy InternFont(IFont font)
-        {
-            BlurgTextExtension appExtension = Application.ExtensionRequire<BlurgTextExtension>();
-            if (font is FontInfo fontInfo)
-            {
-                return (BlurgFontProxy)appExtension.Load(fontInfo);
-            }
-            else if (font is BlurgFontProxy blurgFont)
-            {
-                if (blurgFont.Owner != Blurg)
-                {
-                    if (blurgFont.Path == null)
-                        return (BlurgFontProxy)appExtension.Load(new FontInfo(blurgFont.Family, blurgFont.Weight,
-                            blurgFont.Slant,
-                            blurgFont.Stretch));
-                    else
-                        return (BlurgFontProxy)appExtension.Load(blurgFont.Path);
-                }
-                else
-                {
-                    return blurgFont;
-                }
-            }
-            else
-            {
-                throw new Exception("Unsupported font resource.");
-            }
-        }
-
         private void UseProgram()
         {
             if (_program != 0)
@@ -150,7 +121,7 @@ namespace Dashboard.BlurgText.OpenGL
             if (result.Count == 0)
                 return;
 
-            Matrix4x4 view = Matrix4x4.CreateTranslation(position) * Context.ExtensionRequire<IDeviceContextBase>().Transforms;
+            Matrix4x4 view = Context.ExtensionRequire<IDeviceContextBase>().Transforms;
 
             List<DrawCall> drawCalls = new List<DrawCall>();
             List<Vertex> vertices = new List<Vertex>();

Dashboard.BlurgText/BlurgTextExtension.cs

@@ -11,7 +11,7 @@ namespace Dashboard.BlurgText
         public BlurgDcExtension CreateExtension(BlurgTextExtension appExtension, DeviceContext dc);
     }
 
-    public class BlurgTextExtension(IBlurgDcExtensionFactory dcExtensionFactory) : IApplicationExtension, IFontLoader
+    public class BlurgTextExtension(IBlurgDcExtensionFactory dcExtensionFactory) : IFontLoader
     {
         private readonly Blurg _blurg = new Blurg(GlobalTextureAllocation, GlobalTextureUpdate);
 
@@ -27,6 +27,7 @@ namespace Dashboard.BlurgText
         {
             Context = context;
             context.DeviceContextCreated += OnDeviceContextCreated;
+            _blurg.EnableSystemFonts();
         }
 
         void IContextExtensionBase.Require(IContextBase context) => Require((Application)context);
@@ -130,7 +131,7 @@ namespace Dashboard.BlurgText
         }
     }
 
-    public abstract class BlurgDcExtension : IDeviceContextExtension
+    public abstract class BlurgDcExtension : IDeviceContextExtension, ITextRenderer
     {
         public abstract Blurg Blurg { get; }
         public abstract string DriverName { get; }
@@ -151,6 +152,35 @@ namespace Dashboard.BlurgText
             DrawBlurgResult(result, position);
         }
 
+        protected BlurgFontProxy InternFont(IFont font)
+        {
+            BlurgTextExtension appExtension = Application.ExtensionRequire<BlurgTextExtension>();
+            if (font is FontInfo fontInfo)
+            {
+                return (BlurgFontProxy)appExtension.Load(fontInfo);
+            }
+            else if (font is BlurgFontProxy blurgFont)
+            {
+                if (blurgFont.Owner != Blurg)
+                {
+                    if (blurgFont.Path == null)
+                        return (BlurgFontProxy)appExtension.Load(new FontInfo(blurgFont.Family, blurgFont.Weight,
+                            blurgFont.Slant,
+                            blurgFont.Stretch));
+                    else
+                        return (BlurgFontProxy)appExtension.Load(blurgFont.Path);
+                }
+                else
+                {
+                    return blurgFont;
+                }
+            }
+            else
+            {
+                throw new Exception("Unsupported font resource.");
+            }
+        }
+
         public abstract void Dispose();
 
         IContextBase IContextExtensionBase.Context => Context;
@@ -161,5 +191,20 @@ namespace Dashboard.BlurgText
         }
 
         void IContextExtensionBase.Require(IContextBase context) => Require((DeviceContext)context);
+
+        public Box2d MeasureText(IFont font, float size, string text)
+        {
+            BlurgFontProxy proxy = InternFont(font);
+            Vector2 sz = Blurg.MeasureString(proxy.Font, size * Context.ExtensionRequire<IDeviceContextBase>().Scale, text);
+            return new Box2d(0, 0, sz.X, sz.Y);
+        }
+
+        public void DrawText(Vector2 position, Vector4 color, float size, IFont font, string text)
+        {
+            BlurgFontProxy proxy = InternFont(font);
+            BlurgResult? result = Blurg.BuildString(proxy.Font, size * Context.ExtensionRequire<IDeviceContextBase>().Scale,
+                new BlurgColor((byte)(color.X * 255), (byte)(color.Y * 255), (byte)(color.Z * 255), (byte)(color.W * 255)), text);
+            DrawBlurgResult(result, new Vector3(position, 0));
+        }
     }
 }

Dashboard.Common/Collections/TypeDictionary.cs

@@ -82,7 +82,7 @@ namespace Dashboard.Collections
 
         public void Clear() => _objects.Clear();
 
-        public IEnumerator<T> GetEnumerator() => _objects.Values.GetEnumerator();
+        public IEnumerator<T> GetEnumerator() => _objects.Values.Distinct().GetEnumerator();
         IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
     }
 

Dashboard.Common/Drawing/Brush.cs

@@ -0,0 +1,13 @@
+using System.Drawing;
+
+namespace Dashboard.Drawing
+{
+    public abstract class Brush
+    {
+    }
+
+    public class SolidColorBrush(Color color) : Brush
+    {
+        public Color Color { get; } = color;
+    }
+}

Dashboard.Common/Drawing/IDeviceContextBase.cs

@@ -6,15 +6,28 @@ namespace Dashboard.Drawing
 {
     public interface IDeviceContextBase : IDeviceContextExtension
     {
-        RectangleF ClipRegion { get; }
+        Box2d ClipRegion { get; }
+        Box2d ScissorRegion { get; }
         Matrix4x4 Transforms { get; }
+        float Scale { get; }
+        float ScaleOverride { get; set; }
 
         void ResetClip();
-        void PushClip(RectangleF clipRegion);
+        void PushClip(Box2d clipRegion);
         void PopClip();
 
+        void ResetScissor();
+        void PushScissor(Box2d scissorRegion);
+        void PopScissor();
+
         void ResetTransforms();
         void PushTransforms(in Matrix4x4 matrix);
         void PopTransforms();
+
+        void ClearColor(Color color);
+        void ClearDepth();
+
+        int IncrementZ();
+        int DecrementZ();
     }
 }

Dashboard.Common/Drawing/IFontLoader.cs

@@ -1,3 +1,5 @@
+using Dashboard.Pal;
+
 namespace Dashboard.Drawing
 {
     public interface IFont : IDisposable
@@ -16,7 +18,7 @@ namespace Dashboard.Drawing
         }
     }
 
-    public interface IFontLoader
+    public interface IFontLoader : IApplicationExtension
     {
         IFont Load(FontInfo info);
         IFont Load(string path);

Dashboard.Common/Drawing/IImmediateMode.cs

@@ -1,17 +1,17 @@
 using System.Drawing;
 using System.Numerics;
+using Dashboard.Layout;
 using Dashboard.Pal;
 
 namespace Dashboard.Drawing
 {
+    public record struct RectangleDrawInfo(Vector2 Position, ComputedBox Box, Brush Fill, Brush? Border = null);
+
     public interface IImmediateMode : IDeviceContextExtension
     {
-        void ClearColor(Color color);
-
-
-
         void Line(Vector2 a, Vector2 b, float width, float depth, Vector4 color);
         void Rectangle(Box2d rectangle, float depth, Vector4 color);
+        void Rectangle(in RectangleDrawInfo rectangle);
         void Image(Box2d rectangle, Box2d uv, float depth, ITexture texture);
     }
 }

Dashboard.Common/Events/KeyboardEvents.cs

@@ -44,4 +44,16 @@ namespace Dashboard.Events
         public ScanCode ScanCode { get; } = scanCode;
         public ModifierKeys ModifierKeys { get; } = modifierKeys;
     }
+
+    public class TextInputEventArgs(string text) : UiEventArgs(UiEventType.TextEdit)
+    {
+        public string Text { get; } = text;
+    }
+
+    public class TextEditEventArgs(string candidate, int cursor, int length) : UiEventArgs(UiEventType.TextEdit)
+    {
+        public string Candidate { get; } = candidate;
+        public int Cursor { get; } = cursor;
+        public int Length { get; } = length;
+    }
 }

Dashboard.Common/Events/UiEventArgs.cs

@@ -76,8 +76,7 @@ namespace Dashboard.Events
         }
     }
 
-    public class ControlResizedEventArgs
+    public class ResizeEventArgs() : UiEventArgs(UiEventType.ControlResized)
     {
-
     }
 }

Dashboard.Common/Layout/ILayoutItem.cs

@@ -0,0 +1,18 @@
+using System.ComponentModel;
+using System.Numerics;
+
+namespace Dashboard.Layout
+{
+    public interface ILayoutItem : INotifyPropertyChanged
+    {
+        public LayoutInfo Layout { get; }
+
+        public Vector2 CalculateIntrinsicSize();
+        public Vector2 CalculateSize(Vector2 limits);
+    }
+
+    public interface ILayoutContainer : ILayoutItem, IEnumerable<ILayoutItem>
+    {
+        public ContainerLayoutInfo ContainerLayout { get; }
+    }
+}

Dashboard.Common/Layout/LayoutBox.cs

@@ -0,0 +1,435 @@
+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

@@ -0,0 +1,171 @@
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using System.Numerics;
+using System.Runtime.CompilerServices;
+
+namespace Dashboard.Layout
+{
+    public enum DisplayMode
+    {
+        None,
+        Inline,
+        Block,
+    }
+
+    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;
+            set => SetField(ref _containerMode, value);
+        }
+
+        public FlowDirection FlowDirection
+        {
+            get => _flowDirection;
+            set => SetField(ref _flowDirection, value);
+        }
+
+        public event PropertyChangedEventHandler? PropertyChanged;
+
+        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;
+        }
+    }
+
+    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

@@ -0,0 +1,364 @@
+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/LayoutUnit.cs

@@ -0,0 +1,30 @@
+namespace Dashboard
+{
+    public enum LayoutUnit : short
+    {
+        /// <summary>
+        /// Does not specify a unit.
+        /// </summary>
+        Auto,
+        /// <summary>
+        /// The default unit. A size of a single picture element.
+        /// </summary>
+        Pixel = 1,
+        /// <summary>
+        /// 1/72th of an inch traditional in graphics design.
+        /// </summary>
+        Point = 2,
+        /// <summary>
+        /// The universal length unit for small distances.
+        /// </summary>
+        Millimeter = 3,
+        /// <summary>
+        /// An inverse proportional unit with respect to the container size.
+        /// </summary>
+        Star = 4,
+        /// <summary>
+        /// A directly proportional unit with respect to the container size.
+        /// </summary>
+        Percent = 5,
+    }
+}

Dashboard.Common/Measure.cs

@@ -1,48 +1,108 @@
+using System.Numerics;
+
 namespace Dashboard
 {
-    public enum MeasurementUnit
+    public record struct LayoutUnits(LayoutUnit All)
     {
-        /// <summary>
-        /// The default unit. A size of a single picture element.
-        /// </summary>
-        Pixel,
-        /// <summary>
-        /// 1/72th of an inch traditional in graphics design.
-        /// </summary>
-        Point,
-        /// <summary>
-        /// The universal length unit for small distances.
-        /// </summary>
-        Millimeter,
-        /// <summary>
-        /// An inverse proportional unit with respect to the container size.
-        /// </summary>
-        Star,
-        /// <summary>
-        /// A directly proportional unit with respect to the container size.
-        /// </summary>
-        Percent,
+        public LayoutUnit XUnit
+        {
+            get => (LayoutUnit)(((int)All & 0xF) >> 0);
+            set => All = (LayoutUnit)(((int)All & ~(0xF << 0)) | ((int)value << 0));
         }
 
-    public record struct AdvancedMetric(MeasurementUnit Unit, float Value)
+        public LayoutUnit YUnit
         {
-        public AdvancedMetric Convert(MeasurementUnit target, float dpi, float rel, int stars)
+            get => (LayoutUnit)(((int)All & 0xF) >> 4);
+            set => All = (LayoutUnit)(((int)All & ~(0xF << 4)) | ((int)value << 4));
+        }
+
+        public LayoutUnit ZUnit
+        {
+            get => (LayoutUnit)(((int)All & 0xF) >> 8);
+            set => All = (LayoutUnit)(((int)All & ~(0xF << 8)) | ((int)value << 8));
+        }
+
+        public LayoutUnit WUnit
+        {
+            get => (LayoutUnit)(((int)All & 0xF) >> 12);
+            set => All = (LayoutUnit)(((int)All & ~(0xF << 12)) | ((int)value << 12));
+        }
+    }
+
+    public record struct Metric(LayoutUnit Units, float Value)
+    {
+        public float Compute(float dpi, float rel, float star)
+        {
+            switch (Units)
+            {
+                case LayoutUnit.Auto:
+                    return -1;
+                case LayoutUnit.Millimeter:
+                    float mm2Px = dpi / 25.4f;
+                    return Value * mm2Px;
+                case LayoutUnit.Pixel:
+                    return Value;
+                case LayoutUnit.Point:
+                    float pt2Px = 72 / dpi;
+                    return Value * pt2Px;
+                case LayoutUnit.Percent:
+                    return rel * Value;
+                case LayoutUnit.Star:
+                    return star * Value;
+                default:
+                    throw new Exception("Unrecognized unit.");
+            }
+        }
+    }
+
+    public record struct Metric2D(LayoutUnits Units, Vector2 Value)
+    {
+        public float X
+        {
+            get => Value.X;
+            set => Value = new Vector2(value, Value.Y);
+        }
+
+        public LayoutUnit XUnits
+        {
+            get => Units.XUnit;
+            set => Units = Units with { XUnit = value };
+        }
+
+        public float Y
+        {
+            get => Value.Y;
+            set => Value = new Vector2(Value.X, value);
+        }
+
+        public LayoutUnit YUnits
+        {
+            get => Units.YUnit;
+            set => Units = Units with { YUnit = value };
+        }
+    }
+
+    public record struct BoxMetric(LayoutUnit Units, Box2d Value);
+
+    public record struct AdvancedMetric(LayoutUnit Unit, float Value)
+    {
+        public AdvancedMetric Convert(LayoutUnit target, float dpi, float rel, int stars)
         {
             if (Unit == target)
                 return this;
 
             float pixels = Unit switch {
-                MeasurementUnit.Pixel => Value,
-                MeasurementUnit.Point => Value * (72f / dpi),
-                MeasurementUnit.Millimeter => Value * (28.3464566929f / dpi),
-                MeasurementUnit.Star => Value * rel / stars,
-                MeasurementUnit.Percent => Value * rel / 100,
+                LayoutUnit.Pixel => Value,
+                LayoutUnit.Point => Value * (72f / dpi),
+                LayoutUnit.Millimeter => Value * (28.3464566929f / dpi),
+                LayoutUnit.Star => Value * rel / stars,
+                LayoutUnit.Percent => Value * rel / 100,
                 _ => throw new Exception(),
             };
 
             float value = target switch {
-                MeasurementUnit.Pixel => pixels,
-                MeasurementUnit.Point => Value * (dpi / 72f),
+                LayoutUnit.Pixel => pixels,
+                LayoutUnit.Point => Value * (dpi / 72f),
                 // MeasurementUnit.Millimeter =>
             };
 
@@ -65,22 +125,4 @@ namespace Dashboard
                 ? metric
                 : throw new Exception($"Could not parse the value '{str}'.");
     }
-
-    public static class MeasurementExtensions
-    {
-        public static bool IsRelative(this MeasurementUnit unit) => unit switch {
-            MeasurementUnit.Star or MeasurementUnit.Percent => true,
-            _ => false,
-        };
-        public static bool IsAbsolute(this MeasurementUnit unit) => !IsRelative(unit);
-
-        public static string ToShortString(this MeasurementUnit unit) => unit switch {
-            MeasurementUnit.Pixel => "px",
-            MeasurementUnit.Point => "pt",
-            MeasurementUnit.Millimeter => "mm",
-            MeasurementUnit.Star => "*",
-            MeasurementUnit.Percent => "%",
-            _ => throw new Exception("Unknown unit."),
-        };
-    }
 }

Dashboard.Common/MeasurementExtensions.cs

@@ -0,0 +1,30 @@
+namespace Dashboard
+{
+    public static class MeasurementExtensions
+    {
+        public static bool IsRelative(this LayoutUnit unit) => unit switch {
+            LayoutUnit.Star or LayoutUnit.Percent => true,
+            _ => false,
+        };
+        public static bool IsAbsolute(this LayoutUnit unit) => !IsRelative(unit);
+
+        public static string ToShortString(this LayoutUnit unit) => unit switch {
+            LayoutUnit.Pixel => "px",
+            LayoutUnit.Point => "pt",
+            LayoutUnit.Millimeter => "mm",
+            LayoutUnit.Star => "*",
+            LayoutUnit.Percent => "%",
+            _ => throw new Exception("Unknown unit."),
+        };
+
+        public static bool WithinTolerance(this float value, float reference, float absTol, float relTol)
+            => value.CompareTolerance(reference, absTol, relTol) == 0;
+
+        public static int CompareTolerance(this float value, float reference, float absTol, float relTol)
+        {
+            float tolerance = Math.Max(absTol, Math.Abs(reference) * relTol);
+            float difference = value - reference;
+            return difference < -tolerance ? -1 : difference > tolerance ? 1 : 0;
+        }
+    }
+}

Dashboard.Common/Pal/Application.cs

@@ -16,6 +16,9 @@ namespace Dashboard.Pal
         public bool IsDisposed { get; private set; } = false;
         public IContextDebugger? Debugger { get; set; }
 
+        protected CancellationToken? CancellationToken { get; private set; }
+        protected bool Quit { get; set; } = false;
+
         private readonly TypeDictionary<IApplicationExtension> _extensions =
             new TypeDictionary<IApplicationExtension>(true);
         private readonly TypeDictionary<IApplicationExtension, Func<IApplicationExtension>> _preloadedExtensions =
@@ -58,15 +61,18 @@ namespace Dashboard.Pal
                 Initialize();
         }
 
-        public void Run() => Run(true, CancellationToken.None);
+        public void Run() => Run(true, System.Threading.CancellationToken.None);
 
-        public void Run(bool wait) => Run(wait, CancellationToken.None);
+        public void Run(bool wait) => Run(wait, System.Threading.CancellationToken.None);
 
         public void Run(bool waitForEvents, CancellationToken token)
         {
+            CancellationToken = token;
+            CancellationToken.Value.Register(() => Quit = true);
+
             InitializeInternal();
 
-            while (!token.IsCancellationRequested)
+            while (!Quit && !token.IsCancellationRequested)
             {
                 RunEvents(waitForEvents);
             }
@@ -167,6 +173,7 @@ namespace Dashboard.Pal
         {
             if (!isDisposing) return;
 
+            Quit = true;
             foreach (IApplicationExtension extension in _extensions)
             {
                 extension.Dispose();

Dashboard.Common/Windowing/IDeviceContext.cs

@@ -1,4 +1,5 @@
 using System.Drawing;
+using System.Numerics;
 
 namespace Dashboard.Windowing
 {
@@ -15,6 +16,6 @@ namespace Dashboard.Windowing
         /// <summary>
         /// The size of the window framebuffer in pixels.
         /// </summary>
-        Size FramebufferSize { get; }
+        Vector2 FramebufferSize { get; }
     }
 }

Dashboard.OpenGL/Drawing/DeviceContextBase.cs

@@ -2,24 +2,33 @@ using System.Drawing;
 using System.Numerics;
 using Dashboard.Drawing;
 using Dashboard.Pal;
+using Dashboard.Windowing;
 using OpenTK.Graphics.OpenGL;
 using OpenTK.Graphics.Wgl;
 using OpenTK.Mathematics;
+using ColorBuffer = OpenTK.Graphics.OpenGL.ColorBuffer;
+using Vector2 = System.Numerics.Vector2;
 
 namespace Dashboard.OpenGL.Drawing
 {
     public class DeviceContextBase : IDeviceContextBase
     {
         private readonly Stack<Matrix4x4> _transforms = new Stack<Matrix4x4>();
-        private readonly Stack<RectangleF> _clipRegions = new Stack<RectangleF>();
+        private readonly Stack<Box2d> _clipRegions = new Stack<Box2d>();
+        private readonly Stack<Box2d> _scissorRegions = new Stack<Box2d>();
+        private int _z = 0;
 
         public DeviceContext Context { get; private set; } = null!;
         IContextBase IContextExtensionBase.Context => Context;
         public string DriverName => "Dashboard OpenGL Device Context";
         public string DriverVendor => "Dashboard";
         public Version DriverVersion => new Version(0, 1);
-        public RectangleF ClipRegion => _clipRegions.Peek();
+
+        public Box2d ClipRegion => _clipRegions.Peek();
+        public Box2d ScissorRegion => _scissorRegions.Peek();
         public Matrix4x4 Transforms => _transforms.Peek();
+        public float Scale => ScaleOverride > 0 ? ScaleOverride : (Context.Window as IDpiAwareWindow)?.Scale ?? 1;
+        public float ScaleOverride { get; set; } = -1f;
 
 
         public void Dispose()
@@ -32,6 +41,7 @@ namespace Dashboard.OpenGL.Drawing
             Context = context;
 
             ResetClip();
+            ResetScissor();
             ResetTransforms();
         }
 
@@ -42,17 +52,17 @@ namespace Dashboard.OpenGL.Drawing
         {
             _clipRegions.Clear();
 
-            SizeF size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
-            _clipRegions.Push(new RectangleF(0,0, size.Width, size.Height));
+            Vector2 size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
+            _clipRegions.Push(new Box2d(Vector2.Zero, size));
 
             SetClip(ClipRegion);
         }
 
-        public void PushClip(RectangleF clipRegion)
+        public void PushClip(Box2d clipRegion)
         {
-            clipRegion = new RectangleF(ClipRegion.X + clipRegion.X, ClipRegion.Y + clipRegion.Y,
-                Math.Min(ClipRegion.Right - clipRegion.X, clipRegion.Width),
-                Math.Min(ClipRegion.Bottom - clipRegion.Y, clipRegion.Height));
+            clipRegion = new Box2d(ClipRegion.Min.X + clipRegion.Min.X, ClipRegion.Min.Y + clipRegion.Min.Y,
+                Math.Min(ClipRegion.Max.X, ClipRegion.Min.X + clipRegion.Max.X),
+                Math.Min(ClipRegion.Max.Y, ClipRegion.Max.Y + clipRegion.Max.Y));
             _clipRegions.Push(clipRegion);
 
             SetClip(clipRegion);
@@ -64,20 +74,59 @@ namespace Dashboard.OpenGL.Drawing
             SetClip(ClipRegion);
         }
 
-        private void SetClip(RectangleF rect)
+        public void ResetScissor()
         {
-            SizeF size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
+            GL.Disable(EnableCap.ScissorTest);
+            _scissorRegions.Clear();
+            Vector2 size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
+            _scissorRegions.Push(new Box2d(Vector2.Zero, size));
+        }
+
+        public void PushScissor(Box2d scissorRegion)
+        {
+            GL.Enable(EnableCap.ScissorTest);
+
+            // scissorRegion = new RectangleF(scissorRegion.X + scissorRegion.X, scissorRegion.Y + scissorRegion.Y,
+            //     Math.Min(ScissorRegion.Right - scissorRegion.X, scissorRegion.Width),
+            //     Math.Min(ScissorRegion.Bottom - scissorRegion.Y, scissorRegion.Height));
+            _scissorRegions.Push(scissorRegion);
+
+            SetScissor(scissorRegion);
+        }
+
+        public void PopScissor()
+        {
+            if (_scissorRegions.Count == 1)
+                GL.Disable(EnableCap.ScissorTest);
+
+            _scissorRegions.Pop();
+            SetScissor(ClipRegion);
+        }
+
+        private void SetClip(Box2d rect)
+        {
+            Vector2 size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
             GL.Viewport(
-                (int)Math.Round(rect.X),
-                (int)Math.Round(size.Height - rect.Y - rect.Height),
-                (int)Math.Round(rect.Width),
-                (int)Math.Round(rect.Height));
+                (int)Math.Round(rect.Min.X),
+                (int)Math.Round(size.Y - rect.Min.Y - rect.Size.Y),
+                (int)Math.Round(rect.Size.X),
+                (int)Math.Round(rect.Size.Y));
+        }
+
+        void SetScissor(Box2d rect)
+        {
+            Vector2 size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
+            GL.Scissor(
+                (int)Math.Round(rect.Min.X),
+                (int)Math.Round(size.Y - rect.Min.Y - rect.Size.Y),
+                (int)Math.Round(rect.Size.X),
+                (int)Math.Round(rect.Size.Y));
         }
 
         public void ResetTransforms()
         {
-            SizeF size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
-            Matrix4x4 m  = Matrix4x4.CreateOrthographicOffCenterLeftHanded(0, size.Width, size.Height, 0, 1, -1);
+            Vector2 size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
+            Matrix4x4 m  = Matrix4x4.CreateOrthographicOffCenterLeftHanded(0, size.X, size.Y, 0, 1, -1);
 
             _transforms.Clear();
             _transforms.Push(m);
@@ -93,5 +142,26 @@ namespace Dashboard.OpenGL.Drawing
         {
             _transforms.Pop();
         }
+
+        public void ClearColor(Color color)
+        {
+            GL.ClearColor(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
+            GL.Clear(ClearBufferMask.ColorBufferBit);
+        }
+
+        public void ClearDepth()
+        {
+            GL.Clear(ClearBufferMask.DepthBufferBit);
+        }
+
+        public int IncrementZ()
+        {
+            return ++_z;
+        }
+
+        public int DecrementZ()
+        {
+            return --_z;
+        }
     }
 }

Dashboard.OpenGL/Drawing/ImmediateMode.cs

@@ -1,5 +1,6 @@
 using System.Drawing;
 using System.Numerics;
+using System.Runtime;
 using System.Runtime.InteropServices;
 using Dashboard.Drawing;
 using Dashboard.Pal;
@@ -110,7 +111,6 @@ namespace Dashboard.OpenGL.Drawing
             GL.VertexAttribPointer(_program_acolor, 4, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.ColorOffset);
             GL.EnableVertexAttribArray(_program_acolor);
 
-            Size size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
             Matrix4x4 view = Context.ExtensionRequire<IDeviceContextBase>().Transforms;
 
             GL.UseProgram(_program);
@@ -150,7 +150,6 @@ namespace Dashboard.OpenGL.Drawing
             GL.VertexAttribPointer(_program_acolor, 4, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.ColorOffset);
             GL.EnableVertexAttribArray(_program_acolor);
 
-            Size size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
             Matrix4x4 view = Context.ExtensionRequire<IDeviceContextBase>().Transforms;
 
             GL.UseProgram(_program);
@@ -166,6 +165,20 @@ namespace Dashboard.OpenGL.Drawing
             GL.DeleteBuffer(buffer);
         }
 
+        public void Rectangle(in RectangleDrawInfo rectangle)
+        {
+            // TODO: implement this better.
+            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;
+            Vector4 border = rectangle.Box.Border;
+            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);
+        }
+
         public void Image(Box2d rectangle, Box2d uv, float depth, ITexture texture)
         {
             Span<ImmediateVertex> vertices =
@@ -189,7 +202,6 @@ namespace Dashboard.OpenGL.Drawing
             GL.EnableVertexAttribArray(_program_atexcoord);
             GL.VertexAttribPointer(_program_acolor, 4, VertexAttribPointerType.Float, false, ImmediateVertex.Size, ImmediateVertex.ColorOffset);
             GL.EnableVertexAttribArray(_program_acolor);
-            Size size = ((GLDeviceContext)Context).GLContext.FramebufferSize;
             Matrix4x4 view = Context.ExtensionRequire<IDeviceContextBase>().Transforms;
 
             GL.UseProgram(_program);

Dashboard.OpenGL/GLTextureExtension.cs

@@ -22,7 +22,6 @@ namespace Dashboard.OpenGL
 
         public void Dispose()
         {
-            throw new NotImplementedException();
         }
 
 

Dashboard.OpenGL/IGLContext.cs

@@ -1,4 +1,4 @@
-using System.Drawing;
+using System.Numerics;
 using Dashboard.Windowing;
 
 namespace Dashboard.OpenGL
@@ -17,7 +17,7 @@ namespace Dashboard.OpenGL
         /// <summary>
         /// The size of the framebuffer in pixels.
         /// </summary>
-        public Size FramebufferSize { get; }
+        public Vector2 FramebufferSize { get; }
 
         /// <summary>
         /// Called when the context is disposed.

Dashboard.OpenTK/PAL2/Pal2Application.cs

@@ -44,12 +44,27 @@ namespace Dashboard.OpenTK.PAL2
         protected override void InitializeInternal()
         {
             base.InitializeInternal();
+            CancellationToken?.Register(() =>
+            {
+                TK.Window.PostUserEvent(new ApplicationQuitEventArgs());
+            });
 
             EventQueue.EventRaised += OnEventRaised;
         }
 
+        internal void RemoveWindow(PhysicalWindow window)
+        {
+            _windows.Remove(window);
+        }
+
         public override void RunEvents(bool wait)
         {
+            if (_windows.Count == 0)
+            {
+                Dispose();
+                return;
+            }
+
             TK.Window.ProcessEvents(wait);
 
             long tock = Stopwatch.GetTimestamp();
@@ -85,7 +100,7 @@ namespace Dashboard.OpenTK.PAL2
             }
             else
             {
-                System.Diagnostics.Debugger.Break();
+                // System.Diagnostics.Debugger.Break();
             }
         }
 
@@ -99,6 +114,14 @@ namespace Dashboard.OpenTK.PAL2
 
             switch (type)
             {
+                case PlatformEventType.UserMessage:
+                    if (args is ApplicationQuitEventArgs)
+                    {
+                        Quit = true;
+                        return;
+                    }
+                    break;
+                // Mouse Events
                 case PlatformEventType.MouseDown:
                 {
                     MouseButtonDownEventArgs down = (MouseButtonDownEventArgs)args;
@@ -139,6 +162,8 @@ namespace Dashboard.OpenTK.PAL2
                     info.Window.SendEvent(this, scroll2);
                     break;
                 }
+
+                // Keyboard & Text Events
                 case PlatformEventType.KeyDown:
                 {
                     KeyDownEventArgs down = (KeyDownEventArgs)args;
@@ -163,11 +188,43 @@ namespace Dashboard.OpenTK.PAL2
                     info.Window.SendEvent(this, up2);
                     break;
                 }
+
+                case PlatformEventType.TextInput:
+                {
+                    OPENTK.TextInputEventArgs textInput = (OPENTK.TextInputEventArgs)args;
+                    DB.TextInputEventArgs textInput2 = new DB.TextInputEventArgs(textInput.Text);
+                    info.Window.SendEvent(this, textInput2);
+                    break;
+                }
+                case PlatformEventType.TextEditing:
+                {
+                    TextEditingEventArgs textEditing = (TextEditingEventArgs)args;
+                    TextEditEventArgs textEditing2 = new TextEditEventArgs(textEditing.Candidate, textEditing.Cursor, textEditing.Length);
+                    info.Window.SendEvent(this, textEditing2);
+                    break;
+                }
+
+                // Window/Surface related events.
                 case PlatformEventType.Close:
                 {
                     info.Window.SendEvent(this, new WindowCloseEvent());
                     break;
                 }
+                case PlatformEventType.WindowFramebufferResize:
+                {
+                    var resize = (WindowFramebufferResizeEventArgs)args;
+                    info.Window.SendEvent(this, new ResizeEventArgs());
+                    info.Window.SendEvent(this, new PaintEventArgs(info.Window.DeviceContext));
+                    break;
+                }
+                case PlatformEventType.WindowResize:
+                {
+                    var resize = (WindowResizeEventArgs)args;
+                    info.Window.SendEvent(this, new ResizeEventArgs());
+                    info.Window.SendEvent(this, new PaintEventArgs(info.Window.DeviceContext));
+                    break;
+                }
+
                 default:
                     Debugger?.LogDebug($"Unknown event type {type} with \"{args}\".");
                     break;
@@ -221,4 +278,8 @@ namespace Dashboard.OpenTK.PAL2
             _ => (ScanCode)0,
         };
     }
+
+    internal class ApplicationQuitEventArgs() : EventArgs
+    {
+    }
 }

Dashboard.OpenTK/PAL2/Pal2GLContext.cs

@@ -15,14 +15,15 @@ namespace Dashboard.OpenTK.PAL2
         public WindowHandle WindowHandle { get; }
 
         public ISwapGroup SwapGroup { get; }
+
         public int ContextGroup { get; }
 
-        public Size FramebufferSize
+        public System.Numerics.Vector2 FramebufferSize
         {
             get
             {
                 TK.Window.GetFramebufferSize(WindowHandle, out Vector2i size);
-                return new Size(size.X, size.Y);
+                return new System.Numerics.Vector2(size.X, size.Y);
             }
         }
 
@@ -64,6 +65,7 @@ namespace Dashboard.OpenTK.PAL2
 
         private static int _contextGroupId = 0;
         private static ConcurrentDictionary<OpenGLContextHandle, int> _contextGroupRootContexts = new ConcurrentDictionary<OpenGLContextHandle, int>();
+        private Size _framebufferSize;
 
         private static int GetContextGroup(OpenGLContextHandle handle)
         {

Dashboard.OpenTK/PAL2/PhysicalWindow.cs

@@ -58,7 +58,6 @@ namespace Dashboard.OpenTK.PAL2
             Application = app;
             WindowHandle = window;
             DeviceContext = CreateDeviceContext(app, this, new OpenGLGraphicsApiHints());
-            AddWindow(this);
         }
 
         public PhysicalWindow(Application app, WindowHandle window, OpenGLContextHandle context)
@@ -66,7 +65,6 @@ namespace Dashboard.OpenTK.PAL2
             Application = app;
             WindowHandle = window;
             DeviceContext = new GLDeviceContext(app, this, new Pal2GLContext(window, context));
-            AddWindow(this);
         }
 
         public PhysicalWindow(Application app, GraphicsApiHints hints)
@@ -74,7 +72,6 @@ namespace Dashboard.OpenTK.PAL2
             Application = app;
             WindowHandle = TK.Window.Create(hints);
             DeviceContext = CreateDeviceContext(app, this, hints);
-            AddWindow(this);
         }
 
         private static DeviceContext CreateDeviceContext(Application app, PhysicalWindow window, GraphicsApiHints hints)
@@ -96,27 +93,18 @@ namespace Dashboard.OpenTK.PAL2
             if (IsDisposed) return;
             IsDisposed = true;
 
-            RemoveWindow(this);
 
             (DeviceContext as IDisposable)?.Dispose();
+
+            ((Pal2Application)Application).RemoveWindow(this);
             TK.Window.Destroy(WindowHandle);
         }
 
         public virtual void SendEvent(object? sender, EventArgs args)
         {
-            switch (args)
-            {
-                case UiEventArgs ui:
-                    switch (ui.Type)
-                    {
-                        case UiEventType.ControlInvalidateVisual:
-                            break;
-                    }
-                    break;
-            }
-
             args = TransformEvent(sender, args);
 
+            Form?.SendEvent(this, args);
             EventRaised?.Invoke(this, args);
 
             lock (_listeners)
@@ -148,42 +136,6 @@ namespace Dashboard.OpenTK.PAL2
             }
         }
 
-        private static readonly ConcurrentDictionary<WindowHandle, PhysicalWindow> _windows =
-            new ConcurrentDictionary<WindowHandle, PhysicalWindow>();
-
-        static PhysicalWindow()
-        {
-            EventQueue.EventRaised += EventQueueOnEventRaised;
-        }
-
-        private static void AddWindow(PhysicalWindow window)
-        {
-            _windows.TryAdd(window.WindowHandle, window);
-        }
-
-        private static void RemoveWindow(PhysicalWindow window)
-        {
-            _windows.TryRemove(window.WindowHandle, out _);
-        }
-
-        private static void EventQueueOnEventRaised(PalHandle? handle, PlatformEventType type, EventArgs args)
-        {
-            if (handle is not WindowHandle windowHandle)
-                return;
-
-            if (!_windows.TryGetValue(windowHandle, out PhysicalWindow? window))
-                return;
-
-            switch (type)
-            {
-                case PlatformEventType.MouseMove:
-                case PlatformEventType.Scroll:
-                case PlatformEventType.MouseUp:
-                case PlatformEventType.MouseDown:
-                    break;
-            }
-        }
-
         public float Dpi => Scale * 96f;
 
         public float Scale

Dashboard/Controls/Button.cs

@@ -0,0 +1,69 @@
+using System;
+using System.Drawing;
+using System.Numerics;
+using Dashboard.Drawing;
+using Dashboard.Layout;
+using Dashboard.Pal;
+
+namespace Dashboard.Controls
+{
+    public class Button : Control
+    {
+        private Vector2 _intrinsicSize = Vector2.Zero;
+
+        public bool AutoSize { get; set; } = true;
+        public string Text { get; set; } = "Click!";
+
+        public Font Font { get; set; } = Font.Create(new FontInfo("Rec Mono Linear"));
+        public float TextSize { get; set; } = 12f;
+        public Brush TextBrush { get; set; } = new SolidColorBrush(Color.Black);
+        public Brush ButtonBrush { get; set; } = new SolidColorBrush(Color.DarkSlateGray);
+
+        public Vector2 Padding { get; set; } = new Vector2(4, 4);
+
+        public event EventHandler? Clicked;
+
+        public override Vector2 CalculateIntrinsicSize()
+        {
+            return _intrinsicSize + 2 * Padding;
+        }
+
+        protected void CalculateSize(DeviceContext dc)
+        {
+            Box2d box = dc.ExtensionRequire<ITextRenderer>().MeasureText(Font.Base, TextSize, Text);
+            _intrinsicSize = box.Size;
+            // Layout.Size = box.Size;
+            // ClientArea = new Box2d(ClientArea.Min, ClientArea.Min + Layout.Size);
+        }
+
+        public override void OnPaint(DeviceContext dc)
+        {
+            base.OnPaint(dc);
+
+            if (AutoSize)
+                CalculateSize(dc);
+
+            bool hidden = Layout.OverflowMode == OverflowMode.Hidden;
+            var dcb = dc.ExtensionRequire<IDeviceContextBase>();
+            if (hidden)
+                dcb.PushScissor(ClientArea);
+
+            dcb.PushTransforms(Matrix4x4.CreateTranslation(ClientArea.Left, ClientArea.Top, 0));
+
+            var imm = dc.ExtensionRequire<IImmediateMode>();
+            Color color = (ButtonBrush as SolidColorBrush)?.Color ?? Color.Black;
+            Vector4 colorVector = new Vector4(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
+            imm.Rectangle(ClientArea, 0, colorVector);
+
+            var text = dc.ExtensionRequire<ITextRenderer>();
+            color = (TextBrush as SolidColorBrush)?.Color ?? Color.Black;
+            colorVector = new Vector4(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
+            text.DrawText(Vector2.Zero, colorVector, TextSize, Font.Base, Text);
+
+            if (hidden)
+                dcb.PopScissor();
+
+            dcb.PopTransforms();
+        }
+    }
+}

Dashboard/Controls/ClassSet.cs

@@ -1,77 +0,0 @@
-using System;
-using System.Collections;
-using System.Collections.Generic;
-
-namespace Dashboard.Controls
-{
-    public enum ClassChangeType
-    {
-        Added,
-        Removed,
-    }
-
-    public record struct ClassChanged(object? Owner, string ClassName, ClassChangeType Type);
-
-    public class ClassSet : ICollection<string>
-    {
-        public int Count => _classes.Count;
-        public bool IsReadOnly => false;
-        public object? Owner { get; }
-        public event EventHandler<ClassChanged>? ClassChanged;
-
-        private readonly HashSet<string> _classes = new HashSet<string>();
-
-        public ClassSet(object? owner)
-        {
-            Owner = owner;
-        }
-
-        public IEnumerator<string> GetEnumerator() => _classes.GetEnumerator();
-
-        IEnumerator IEnumerable.GetEnumerator()
-        {
-            return GetEnumerator();
-        }
-
-        public void Add(string item)
-        {
-            if (_classes.Add(item))
-            {
-                OnClassAdded(item);
-            }
-        }
-
-        public void Clear()
-        {
-            foreach (string @class in _classes)
-                OnClassRemoved(@class);
-
-            _classes.Clear();
-        }
-
-        public bool Contains(string item) => _classes.Contains(item);
-
-        public void CopyTo(string[] array, int arrayIndex) => _classes.CopyTo(array, arrayIndex);
-
-        public bool Remove(string item)
-        {
-            if (_classes.Remove(item))
-            {
-                OnClassRemoved(item);
-                return true;
-            }
-
-            return false;
-        }
-
-        private void OnClassAdded(string @class)
-        {
-            ClassChanged?.Invoke(this, new ClassChanged(Owner, @class, ClassChangeType.Added));
-        }
-
-        private void OnClassRemoved(string @class)
-        {
-            ClassChanged?.Invoke(this, new ClassChanged(Owner, @class, ClassChangeType.Removed));
-        }
-    }
-}

Dashboard/Controls/Container.cs

@@ -0,0 +1,145 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Dashboard.Drawing;
+using Dashboard.Events;
+using Dashboard.Layout;
+using Dashboard.Pal;
+
+namespace Dashboard.Controls
+{
+    public class Container : Control, IList<Control>, ILayoutContainer
+    {
+        private readonly List<Control> _controls = new List<Control>();
+
+        public int Count => _controls.Count;
+
+        public bool IsReadOnly => false;
+
+        public ContainerLayoutInfo ContainerLayout { get; } = new ContainerLayoutInfo();
+
+        public event EventHandler<ContainerChildAddedEventArgs>? ChildAdded;
+        public event EventHandler<ContainerChildRemovedEventArgs>? ChildRemoved;
+
+
+        public Control this[int index]
+        {
+            get => _controls[index];
+            set => _controls[index] = value;
+        }
+
+        protected override void ValidateLayout()
+        {
+            if (!IsLayoutEnabled || IsLayoutValid)
+                return;
+
+            // LayoutSolution solution = LayoutSolution.CalculateLayout(this, ClientArea.Size);
+
+            base.ValidateLayout();
+        }
+
+        public override void OnPaint(DeviceContext dc)
+        {
+            base.OnPaint(dc);
+
+            var dcb = dc.ExtensionRequire<IDeviceContextBase>();
+            dcb.PushClip(ClientArea);
+            ValidateLayout();
+
+            foreach (Control child in _controls)
+            {
+                if (child.Layout.DisplayMode == DisplayMode.None)
+                    continue;
+
+                child.SendEvent(this, new PaintEventArgs(dc));
+            }
+
+            dcb.PopClip();
+        }
+
+        IEnumerator<ILayoutItem> IEnumerable<ILayoutItem>.GetEnumerator()
+        {
+            return GetEnumerator();
+        }
+
+        public IEnumerator<Control> GetEnumerator()
+        {
+            return _controls.GetEnumerator();
+        }
+
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return ((IEnumerable)_controls).GetEnumerator();
+        }
+
+        public void Add(Control item)
+        {
+            SetParent(this, item);
+
+            _controls.Add(item);
+            ChildAdded?.Invoke(this, new ContainerChildAddedEventArgs(this, item));
+        }
+
+        public void Clear()
+        {
+            foreach (Control control in this)
+            {
+                ChildRemoved?.Invoke(this, new ContainerChildRemovedEventArgs(this, control));
+            }
+            _controls.Clear();
+        }
+
+        public bool Contains(Control item)
+        {
+            return _controls.Contains(item);
+        }
+
+        public void CopyTo(Control[] array, int arrayIndex)
+        {
+            _controls.CopyTo(array, arrayIndex);
+        }
+
+        public bool Remove(Control item)
+        {
+            if (!_controls.Remove(item))
+                return false;
+
+            ChildRemoved?.Invoke(this, new ContainerChildRemovedEventArgs(this, item));
+            return true;
+        }
+
+        public int IndexOf(Control item)
+        {
+            return _controls.IndexOf(item);
+        }
+
+        public void Insert(int index, Control item)
+        {
+            SetParent(this, item);
+
+            _controls.Insert(index, item);
+            ChildAdded?.Invoke(this, new ContainerChildAddedEventArgs(this, item));
+        }
+
+        public void RemoveAt(int index)
+        {
+            Control child = _controls[index];
+            _controls.RemoveAt(index);
+            ChildRemoved?.Invoke(this, new ContainerChildRemovedEventArgs(this, child));
+        }
+
+
+    }
+
+    public class ContainerChildAddedEventArgs(Container parent, Control child) : EventArgs
+    {
+        public Container Parent { get; } = parent;
+        public Control Child { get; } = child;
+    }
+
+    public class ContainerChildRemovedEventArgs(Container parent, Control child) : EventArgs
+    {
+        public Container Parent { get; } = parent;
+        public Control Child { get; } = child;
+    }
+}

Dashboard/Controls/Control.cs

@@ -1,16 +1,22 @@
 using System;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Drawing;
+using System.Numerics;
+using Dashboard.Drawing;
 using Dashboard.Events;
+using Dashboard.Layout;
 using Dashboard.Pal;
 using Dashboard.Windowing;
 
 namespace Dashboard.Controls
 {
-    public class Control : IEventListener, IDisposable
+    public class Control : IEventListener, ILayoutItem, IDisposable
     {
         private Form? _owner = null;
 
         public string? Id { get; set; }
-        public ClassSet Classes { get; }
+
         public Form Owner
         {
             get => _owner ?? throw NoOwnerException;
@@ -26,7 +32,14 @@ namespace Dashboard.Controls
         public virtual Box2d ClientArea { get; set; }
         public bool IsFocused => _owner?.FocusedControl == this;
 
-        public event EventHandler<DeviceContext> Painting;
+        public Brush Background { get; set; } = new SolidColorBrush(Color.Transparent);
+        public Brush BorderBrush { get; set; } = new SolidColorBrush(Color.Black);
+
+        public LayoutInfo Layout { get; } = new LayoutInfo();
+        public bool IsLayoutEnabled { get; private set; } = true;
+        protected bool IsLayoutValid { get; set; } = false;
+
+        public event EventHandler<DeviceContext>? Painting;
         public event EventHandler<TickEventArgs>? AnimationTick;
         public event EventHandler? OwnerChanged;
         public event EventHandler? ParentChanged;
@@ -35,9 +48,15 @@ namespace Dashboard.Controls
         public event EventHandler? Disposing;
         public event EventHandler? Resized;
 
-        public Control()
+        public virtual Vector2 CalculateIntrinsicSize()
         {
-            Classes = new ClassSet(this);
+            return Vector2.Zero;
+            // return Vector2.Max(Vector2.Zero, Vector2.Max(Layout.Size, Layout.MinimumSize));
+        }
+
+        public Vector2 CalculateSize(Vector2 limits)
+        {
+            return CalculateIntrinsicSize();
         }
 
         public virtual void OnPaint(DeviceContext dc)
@@ -93,7 +112,7 @@ namespace Dashboard.Controls
             OnEventRaised(sender, args);
         }
 
-        internal static void SetParent(Control parent, Control child)
+        internal static void SetParent(Container parent, Control child)
         {
             child.Parent = parent;
             child.ParentChanged?.Invoke(child, EventArgs.Empty);
@@ -127,6 +146,7 @@ namespace Dashboard.Controls
         protected virtual void OnResize()
         {
             Resized?.Invoke(this, EventArgs.Empty);
+            InvalidateLayout();
         }
 
         private void OnOwnerChanged(Form value)
@@ -134,6 +154,28 @@ namespace Dashboard.Controls
             OwnerChanged?.Invoke(this, EventArgs.Empty);
         }
 
+        public void InvalidateLayout()
+        {
+            IsLayoutValid = false;
+        }
+
+        protected virtual void ValidateLayout()
+        {
+            IsLayoutValid = true;
+        }
+
+        public void ResumeLayout()
+        {
+            IsLayoutEnabled = true;
+        }
+
+        public void SuspendLayout()
+        {
+            IsLayoutEnabled = false;
+            IsLayoutValid = false;
+        }
+
         protected static Exception NoOwnerException => new Exception("No form owns this control");
+        public event PropertyChangedEventHandler? PropertyChanged;
     }
 }

Dashboard/Controls/Form.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Drawing;
 using Dashboard.Drawing;
 using Dashboard.Events;
 using Dashboard.Pal;
@@ -6,13 +7,23 @@ using Dashboard.Windowing;
 
 namespace Dashboard.Controls
 {
-    public class Form : Control, IForm
+    public class Form : Container, IForm
     {
+        private string? _title = "Untitled Form";
         public IWindow Window { get; }
 
         public Image? WindowIcon { get; set; }
-        public string? Title { get; set; } = "Untitled Form";
-        public Control? Root { get; set; } = null;
+
+        public string? Title
+        {
+            get => _title;
+            set
+            {
+                _title = value;
+                Window.Title = _title ?? "";
+            }
+        }
+        public Brush Background { get; set; } = new SolidColorBrush(Color.SlateGray);
         public Control? FocusedControl { get; private set; } = null;
 
         public override Box2d ClientArea
@@ -27,6 +38,8 @@ namespace Dashboard.Controls
         {
             Window = window;
             window.Form = this;
+
+            Window.Title = _title;
         }
 
         public void Focus(Control control)
@@ -41,7 +54,18 @@ namespace Dashboard.Controls
         public override void OnPaint(DeviceContext dc)
         {
             dc.Begin();
-            Root?.SendEvent(this, new PaintEventArgs(dc));
+
+            var dcb = dc.ExtensionRequire<IDeviceContextBase>();
+            dcb.ResetClip();
+            dcb.ResetScissor();
+            dcb.ResetTransforms();
+
+            if (Background is SolidColorBrush solidColorBrush)
+                dcb.ClearColor(solidColorBrush.Color);
+
+            foreach (Control child in this)
+                child.SendEvent(this, new PaintEventArgs(dc));
+
             dc.End();
         }
 
@@ -55,5 +79,17 @@ namespace Dashboard.Controls
             Dispose();
             Window.Dispose();
         }
+
+        protected override void OnEventRaised(object? sender, EventArgs args)
+        {
+            base.OnEventRaised(sender, args);
+
+            switch (args)
+            {
+                case WindowCloseEvent close:
+                    OnClosing(close);
+                    break;
+            }
+        }
     }
 }

Dashboard/Controls/ImageBox.cs

@@ -0,0 +1,27 @@
+using System.Numerics;
+using Dashboard.Drawing;
+using Dashboard.Pal;
+
+namespace Dashboard.Controls
+{
+    public class ImageBox : Control
+    {
+        public Image? Image { get; set; }
+
+        public override Vector2 CalculateIntrinsicSize()
+        {
+            return new Vector2(Image?.Width ?? 0, Image?.Height ?? 0);
+        }
+
+        public override void OnPaint(DeviceContext dc)
+        {
+            if (Image == null)
+                return;
+
+            // Layout.Size = CalculateIntrinsicSize();
+
+            // dc.ExtensionRequire<IImmediateMode>().Image(new Box2d(ClientArea.Min, ClientArea.Min + Layout.Size), new Box2d(0, 0, 1, 1), 0, Image.InternTexture(dc));
+            base.OnPaint(dc);
+        }
+    }
+}

Dashboard/Controls/Label.cs

@@ -2,30 +2,61 @@ using System;
 using System.Drawing;
 using System.Numerics;
 using Dashboard.Drawing;
+using Dashboard.Layout;
 using Dashboard.Pal;
 
 namespace Dashboard.Controls
 {
     public class Label : Control
     {
+        private Vector2 _intrinsicSize = Vector2.Zero;
+
         public bool AutoSize { get; set; } = true;
         public string Text { get; set; } = "";
 
         public event EventHandler? TextChanged;
 
         // protected IBrush TextBrush => throw new NotImplementedException();
-        protected IFont Font => throw new NotImplementedException();
+        public Font Font { get; set; } = Drawing.Font.Create(new FontInfo("Rec Mono Linear"));
+        public float TextSize { get; set; } = 12f;
+        public Brush TextBrush { get; set; } = new SolidColorBrush(Color.Black);
 
-        protected virtual void OnTextChanged(string oldValue, string newValue)
+        public override Vector2 CalculateIntrinsicSize()
         {
-            if (AutoSize)
-                CalculateSize();
+            return _intrinsicSize;
         }
 
-        protected void CalculateSize()
+        protected void CalculateSize(DeviceContext dc)
         {
-            // SizeF sz = Typesetter.MeasureString(Font, Text);
-            // ClientArea = new Box2d(ClientArea.Min, ClientArea.Min + (Vector2)sz);
+            Box2d box = dc.ExtensionRequire<ITextRenderer>().MeasureText(Font.Base, TextSize, Text);
+            // _intrinsicSize = box.Size;
+            // Layout.Size = box.Size;
+            // ClientArea = new Box2d(ClientArea.Min, ClientArea.Min + Layout.Size);
+        }
+
+        public override void OnPaint(DeviceContext dc)
+        {
+            base.OnPaint(dc);
+
+            if (AutoSize)
+                CalculateSize(dc);
+
+            bool hidden = Layout.OverflowMode == OverflowMode.Hidden;
+            var dcb = dc.ExtensionRequire<IDeviceContextBase>();
+            if (hidden)
+                dcb.PushScissor(ClientArea);
+
+            dcb.PushTransforms(Matrix4x4.CreateTranslation(ClientArea.Left, ClientArea.Top, 0));
+
+            var text = dc.ExtensionRequire<ITextRenderer>();
+            Color color = (TextBrush as SolidColorBrush)?.Color ?? Color.Black;
+            Vector4 colorVector = new Vector4(color.R / 255f, color.G / 255f, color.B / 255f, color.A / 255f);
+            text.DrawText(Vector2.Zero, colorVector, TextSize, Font.Base, Text);
+
+            if (hidden)
+                dcb.PopScissor();
+
+            dcb.PopTransforms();
         }
     }
 }

Dashboard/Controls/MessageBox.cs

@@ -2,10 +2,10 @@ using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Collections.ObjectModel;
+using System.Collections.Specialized;
 using System.IO;
 using System.Reflection;
 using Dashboard.Drawing;
-using Dashboard.Pal;
 using Dashboard.Windowing;
 
 namespace Dashboard.Controls
@@ -36,20 +36,128 @@ namespace Dashboard.Controls
     /// </summary>
     public class MessageBox : Form
     {
-        private Image? _icon;
+        private MessageBoxIcon _icon;
+        private MessageBoxButtons _buttons;
+        private ImageBox _iconBox = new ImageBox();
         private Label  _label = new Label();
-        private readonly List<Label> _buttons = new List<Label>();
+        private Container _main = new Container();
+        private Container _buttonsContainer = new Container();
 
-        public MessageBoxIcon Icon { get; set; }
-        public Image? CustomImage { get; set; }
-        public string? Message { get; set; }
-        public MessageBoxButtons Buttons { get; set; }
+        private Image? IconImage
+        {
+            get => _iconBox.Image;
+            set => _iconBox.Image = value;
+        }
+
+        public MessageBoxIcon Icon
+        {
+            get => _icon;
+            set
+            {
+                IconImage = value switch
+                {
+                    MessageBoxIcon.Question => s_questionIcon,
+                    MessageBoxIcon.Info => s_infoIcon,
+                    MessageBoxIcon.Warning => s_warningIcon,
+                    MessageBoxIcon.Error => s_errorIcon,
+                    _ => null,
+                };
+
+                _icon = value;
+            }
+        }
+
+        public Image? CustomImage
+        {
+            get => Icon == MessageBoxIcon.Custom ? IconImage : null;
+            set
+            {
+                if (IconImage == null)
+                    return;
+                Icon = MessageBoxIcon.Custom;
+                IconImage = value;
+            }
+        }
+
+        public string? Message
+        {
+            get => _label.Text;
+            set => _label.Text = value ?? String.Empty;
+        }
+
+        public MessageBoxButtons Buttons
+        {
+            get => _buttons;
+            set
+            {
+                _buttons = value;
+                UpdateButtons();
+            }
+        }
         public ObservableCollection<string> CustomButtons { get; } = new ObservableCollection<string>();
-        public int Result { get; private set; }
+        public int Result { get; private set; } = -1;
 
         public MessageBox(IWindow window) : base(window)
         {
-            SetParent(this, _label);
+            // Layout.Rows.Clear();
+            // Layout.Rows.Add(-1);
+            // Layout.Rows.Add(48);
+            //
+            // Add(_main);
+            // _main.Layout.Columns.Clear();
+            // _main.Layout.Columns.Add(48);
+            // _main.Layout.Columns.Add(-1);
+
+            _main.Add(_iconBox);
+            _main.Add(_label);
+            _label.Layout.Column = 1;
+
+            Add(_buttonsContainer);
+            _buttonsContainer.Layout.Row = 1;
+
+            CustomButtons.CollectionChanged += (sender, ea) => UpdateButtons();
+
+            UpdateButtons();
+        }
+
+        private void UpdateButtons()
+        {
+            foreach (Control button in _buttonsContainer)
+            {
+                Remove(button);
+            }
+
+            IList<string> list = Buttons switch
+            {
+                MessageBoxButtons.Custom => CustomButtons,
+                MessageBoxButtons.AbortRetryIgnore => s_abortRetryContinue,
+                MessageBoxButtons.CancelRetryContinue => s_cancelRetryContinue,
+                MessageBoxButtons.OkCancel => s_okCancel,
+                MessageBoxButtons.RetryCancel => s_retryCancel,
+                MessageBoxButtons.YesNo => s_yesNo,
+                MessageBoxButtons.YesNoCancel => s_yesNoCancel,
+                _ => s_ok,
+            };
+
+            // _buttonsContainer.Clear();
+            // _buttonsContainer.Layout.Columns.Clear();
+            // for (int i = 0; i < list.Count; 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.Layout.Column = i;
+            //     _buttonsContainer.Add(button);
+            //     Add(button);
+            // }
+        }
+
+        private void ButtonClicked(object? sender, EventArgs ea, int i)
+        {
+            Result = i;
+            Dispose();
         }
 
         public static readonly Image s_questionIcon;

Dashboard/Drawing/Font.cs

@@ -0,0 +1,42 @@
+using System;
+using System.IO;
+using System.Net.Mime;
+using Dashboard.Pal;
+
+namespace Dashboard.Drawing
+{
+    public class Font(IFont iFont) : IFont
+    {
+        public IFont Base => iFont;
+        public string Family => iFont.Family;
+        public FontWeight Weight => iFont.Weight;
+        public FontSlant Slant => iFont.Slant;
+        public FontStretch Stretch => iFont.Stretch;
+
+        public void Dispose()
+        {
+            iFont.Dispose();
+        }
+
+        public static Font Create(Stream stream)
+        {
+            IFont iFont = Application.Current.ExtensionRequire<IFontLoader>().Load(stream);
+
+            return new Font(iFont);
+        }
+
+        public static Font Create(FontInfo info)
+        {
+            IFont iFont = Application.Current.ExtensionRequire<IFontLoader>().Load(info);
+
+            return new Font(iFont);
+        }
+
+        public static Font Create(string path)
+        {
+            IFont iFont = Application.Current.ExtensionRequire<IFontLoader>().Load(path);
+
+            return new Font(iFont);
+        }
+    }
+}

Dashboard/Drawing/Image.cs

@@ -67,8 +67,6 @@ namespace Dashboard.Drawing
         {
             IImageLoader imageLoader = Application.Current.ExtensionRequire<IImageLoader>();
             return new Image(imageLoader.LoadImageData(stream));
-
-
         }
     }
 }

tests/Dashboard.TestApplication/Program.cs

@@ -1,11 +1,7 @@
-using System.Drawing;
-using System.Text;
-using BlurgText;
-using Dashboard.BlurgText;
+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;
@@ -13,10 +9,7 @@ using Dashboard.StbImage;
 using OpenTK.Graphics.OpenGL;
 using OpenTK.Mathematics;
 using OpenTK.Platform;
-using Image = Dashboard.Drawing.Image;
-using MouseMoveEventArgs = OpenTK.Platform.MouseMoveEventArgs;
 using TK = OpenTK.Platform.Toolkit;
-using Vector4 = System.Numerics.Vector4;
 
 TK.Init(new ToolkitOptions()
 {
@@ -51,24 +44,17 @@ Application app = new Pal2Application()
     }
 };
 
-PhysicalWindow window;
 CancellationTokenSource source = new CancellationTokenSource();
-// GLEngine engine;
-// ContextExecutor executor;
-// DimUI dimUI;
-Vector2 mousePos = Vector2.Zero;
-Random r = new Random();
-List<Vector3> points = new List<Vector3>();
-// IFont font;
-StringBuilder builder = new StringBuilder();
 
 app.Initialize();
 app.ExtensionRequire<StbImageLoader>();
 app.ExtensionLoad(new BlurgTextExtension(new BlurgTextExtensionFactory()));
 
-window = (PhysicalWindow)app.CreatePhysicalWindow();
+PhysicalWindow window = (PhysicalWindow)app.CreatePhysicalWindow();
+MessageBox box = MessageBox.Create(window, "Are you sure you want to exit?", "Confirm Exit", MessageBoxIcon.Question,
+    MessageBoxButtons.YesNo);
 
-window.Title = "DashTerm";
+// 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);
@@ -79,126 +65,14 @@ GLDeviceContext context = (GLDeviceContext)window.DeviceContext;
 context.GLContext.MakeCurrent();
 context.GLContext.SwapGroup.SwapInterval = 1;
 
-// engine = new GLEngine();
-// engine.Initialize();
-//
-// executor = engine.GetExecutor(context);
-//
-// dimUI = new DimUI(new DimUIConfig()
-// {
-//     Font = new NamedFont("Noto Sans", 9f),
-// });
-
-EventQueue.EventRaised += (handle, type, eventArgs) =>
-{
-    if (handle != window.WindowHandle)
-        return;
-
-    switch (type)
-    {
-        case PlatformEventType.Close:
-            source.Cancel();
-            break;
-        case PlatformEventType.MouseMove:
-            mousePos = ((MouseMoveEventArgs)eventArgs).ClientPosition;
-            break;
-    }
-};
+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);
-// font = Typesetter.LoadFont("Nimbus Mono", 12f);
 
-foreach (string str in typeof(Image).Assembly.GetManifestResourceNames()) Console.WriteLine(str);
-
-BlurgFont font = context.ExtensionRequire<BlurgDcExtension>().Blurg
-    .QueryFont("Recursive Mono", FontWeight.Regular, false) ?? throw new Exception("Font not found");
-
-window.EventRaised += (sender, ea) => {
-        if (ea is not PaintEventArgs)
-            return;
-
-        TK.Window.GetSize(window.WindowHandle, out Vector2i size);
-        // executor.BeginFrame();
-        //
-        // dimUI.Begin(new Box2d(0, 0, size.X, size.Y), window.DrawQueue);
-        // dimUI.Text("Hello World!");
-        // dimUI.Button("Cancel"); dimUI.SameLine();
-        // dimUI.Button("OK");
-        //
-        // dimUI.Input("type me!", builder);
-        //
-        // dimUI.BeginMenu();
-        //
-        // if (dimUI.MenuItem("File"))
-        // {
-        //     dimUI.BeginMenu();
-        //     dimUI.MenuItem("New Window");
-        //     dimUI.MenuItem("Preferences");
-        //     dimUI.MenuItem("Exit");
-        //     dimUI.EndMenu();
-        // }
-        //
-        // if (dimUI.MenuItem("Edit"))
-        // {
-        //     dimUI.BeginMenu();
-        //     dimUI.MenuItem("Cut");
-        //     dimUI.MenuItem("Copy");
-        //     dimUI.MenuItem("Paste");
-        //
-        //     if (dimUI.MenuItem("Send Char"))
-        //     {
-        //         dimUI.BeginMenu();
-        //         dimUI.EndMenu();
-        //     }
-        //
-        //     dimUI.EndMenu();
-        // }
-        //
-        // if (dimUI.MenuItem("View"))
-        // {
-        //     dimUI.BeginMenu();
-        //     dimUI.MenuItem("Clear");
-        //
-        //     if (dimUI.MenuItem("Set Size"))
-        //     {
-        //         dimUI.BeginMenu();
-        //         dimUI.MenuItem("24 x 40");
-        //         dimUI.MenuItem("25 x 40");
-        //         dimUI.MenuItem("24 x 80");
-        //         dimUI.MenuItem("25 x 80");
-        //         dimUI.MenuItem("25 x 120");
-        //         dimUI.EndMenu();
-        //     }
-        //
-        //     dimUI.EndMenu();
-        // }
-        //
-        // dimUI.Finish();
-
-        GL.Viewport(0, 0, size.X, size.Y);
-        GL.ClearColor(0.3f, 0.3f, 0.3f, 1.0f);
-        GL.Clear(ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit);
-        GL.Disable(EnableCap.DepthTest);
-        GL.Enable(EnableCap.Blend);
-        GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
-        GL.ColorMask(true, true, true, true);
-
-        ITexture texture = MessageBox.s_questionIcon.InternTexture(context);
-
-        // executor.Draw(window.DrawQueue, new RectangleF(0, 0, size.X, size.Y), 1.5f /*(window as IDpiAwareWindow)?.Scale ?? 1*/);
-        // executor.EndFrame();
-
-        context.Begin();
-
-        IImmediateMode imm = context.ExtensionRequire<IImmediateMode>();
-        imm.ClearColor(Color.Magenta);
-        imm.Line(new System.Numerics.Vector2(10, 10), new System.Numerics.Vector2(50, 50), 3, 0, new Vector4(0.2f, 0.2f, 1.0f, 1.0f));
-
-        BlurgDcExtension blurg = context.ExtensionRequire<BlurgDcExtension>();
-        blurg.DrawBlurgFormattedText(new BlurgFormattedText("Hello world!", font) { DefaultSize = 64f }, new System.Numerics.Vector3(24, 24, 1));
-
-        context.End();
-};
+window.DeviceContext.ExtensionRequire<IDeviceContextBase>().ScaleOverride = 1.5f;
 
 app.Run(true, source.Token);