TextFormat

src/ConsoleApp/FileTime.ConsoleUI.App/Controls/Dialogs.cs

@@ -8,6 +8,7 @@ using GeneralInputKey;
 using TerminalUI.Controls;
 using TerminalUI.Extensions;
 using TerminalUI.Models;
+using TerminalUI.TextFormat;
 using TerminalUI.Traits;
 using TerminalUI.ViewExtensions;
 
@@ -22,11 +23,26 @@ public class Dialogs
 
     private Action? _readInputChildHandlerUnSubscriber;
 
+
+    private readonly ITextFormat _specialItemNamePartFormat;
+
     public Dialogs(IRootViewModel rootViewModel, ITheme theme)
     {
         _rootViewModel = rootViewModel;
         _theme = theme;
 
+        _specialItemNamePartFormat = new OrFormat
+        {
+            Format1 = new AnsiFormat
+            {
+                IsUnderline = true
+            },
+            Format2 = new SimpleFormat
+            {
+                Foreground = _theme.DefaultForegroundAccentColor
+            }
+        };
+
         rootViewModel.FocusReadInputElement += element =>
         {
             _inputElementToFocus = element;
@@ -185,16 +201,15 @@ public class Dialogs
                     ColumnDefinitionsObject = "* *",
                     ChildInitializer =
                     {
-                        new ItemsControl<IPreviewElement, ItemNamePart>()
+                        new ItemsControl<IPreviewElement, ItemNamePart>
                         {
                             Orientation = Orientation.Horizontal,
                             ItemTemplate = ItemNamePartItemTemplate
                         }.Setup(i => i.Bind(
                             i,
                             dc => ((DoubleItemNamePartListPreview) dc).ItemNameParts1,
-                            c => c.ItemsSource,
+                            c => c.ItemsSource)),
-                            v => v)),
+                        new ItemsControl<IPreviewElement, ItemNamePart>
-                        new ItemsControl<IPreviewElement, ItemNamePart>()
                         {
                             Orientation = Orientation.Horizontal,
                             Extensions =
@@ -226,8 +241,8 @@ public class Dialogs
             );
             textBlock.Bind(
                 textBlock,
-                dc => dc.IsSpecial ? _theme.DefaultForegroundAccentColor : null,
+                dc => dc.IsSpecial ? _specialItemNamePartFormat : null,
-                tb => tb.Foreground
+                tb => tb.TextFormat
             );
 
             return textBlock;
@@ -327,8 +342,7 @@ public class Dialogs
             .Setup(t => t.Bind(
                 t,
                 d => d.DialogService.ReadInput.Value.Inputs,
-                c => c.ItemsSource,
+                c => c.ItemsSource
-                v => v
             ));
 
         readInputs.WithKeyHandler((_, e) =>

src/ConsoleApp/FileTime.ConsoleUI.App/Controls/Timeline.cs

@@ -91,8 +91,7 @@ public class Timeline
                     .Setup(i => i.Bind(
                         i,
                         dc => dc.TimelineViewModel.ParallelCommandsGroups[0].Commands,
-                        i => i.ItemsSource,
+                        i => i.ItemsSource))
-                        v => v))
             }
         };
 

src/ConsoleApp/FileTime.ConsoleUI.App/MainWindow.cs

@@ -185,6 +185,30 @@ public class MainWindow
                     },
                     ChildInitializer =
                     {
+                        new StackPanel<IRootViewModel>
+                        {
+                            Orientation = Orientation.Horizontal,
+                            ChildInitializer =
+                            {
+                                new TextBlock<IRootViewModel>
+                                    {
+                                        Margin = "0 0 1 0",
+                                    }
+                                    .Setup(t => t.Bind(
+                                        t,
+                                        dc => dc.AppState.SelectedTab.Value.CurrentSelectedItem.Value.Attributes,
+                                        tb => tb.Text)),
+                                new TextBlock<IRootViewModel>
+                                    {
+                                        Margin = "0 0 1 0",
+                                    }
+                                    .Setup(t => t.Bind(
+                                        t,
+                                        dc => dc.AppState.SelectedTab.Value.CurrentSelectedItem.Value.ModifiedAt,
+                                        tb => tb.Text,
+                                        v => v.ToString()))
+                            }
+                        },
                         new TextBlock<IRootViewModel>
                             {
                                 Extensions = {new GridPositionExtension(1, 0)}

src/ConsoleApp/FileTime.ConsoleUI/InfoProviders/ColorSchema.cs

@@ -13,7 +13,7 @@ public static class ColorSchema
     public static void PrintColorSchema(ITheme theme, IConsoleDriver consoleDriver)
     {
         consoleDriver.Dispose();
-        consoleDriver.ResetColor();
+        consoleDriver.ResetStyle();
         PrintThemeColors(theme, consoleDriver);
 
         if (theme is IColorSampleProvider colorSampleProvider)
@@ -46,7 +46,7 @@ public static class ColorSchema
             PrintColor(consoleDriver, colorProperty.Name, color, colorTextStartX);
         }
 
-        consoleDriver.ResetColor();
+        consoleDriver.ResetStyle();
         consoleDriver.Write(Environment.NewLine);
     }
 
@@ -95,13 +95,13 @@ public static class ColorSchema
             PrintColor(consoleDriver, key, value, colorTextStartX);
         }
         
-        consoleDriver.ResetColor();
+        consoleDriver.ResetStyle();
         consoleDriver.Write(Environment.NewLine);
     }
 
     private static void PrintColor(IConsoleDriver consoleDriver, string name, IColor? color, int colorTextStartX)
     {
-        consoleDriver.ResetColor();
+        consoleDriver.ResetStyle();
         consoleDriver.Write(name + ":");
         var y = consoleDriver.GetCursorPosition().Y;
         consoleDriver.SetCursorPosition(new Position(colorTextStartX, y));
@@ -124,7 +124,7 @@ public static class ColorSchema
             consoleDriver.Write("Sample text");
         }
 
-        consoleDriver.ResetColor();
+        consoleDriver.ResetStyle();
         consoleDriver.Write(Environment.NewLine);
     }
 }

src/Library/TerminalUI.Examples/Controls/ProgressBarExamples.cs

@@ -2,6 +2,7 @@
 using TerminalUI.ConsoleDrivers;
 using TerminalUI.Controls;
 using TerminalUI.Models;
+using TerminalUI.TextFormat;
 
 namespace TerminalUI.Examples.Controls;
 
@@ -56,7 +57,8 @@ public class ProgressBarExamples
             true,
             null,
             null,
-            new()
+            new(),
+            new TextFormatContext(true)
         );
         progressBar.Render(renderContext, position, new Size(10, 1));
     }

src/Library/TerminalUI/ConsoleDrivers/DotnetDriver.cs

@@ -6,6 +6,8 @@ namespace TerminalUI.ConsoleDrivers;
 
 public class DotnetDriver : IConsoleDriver
 {
+    public bool SupportsAnsiEscapeSequence { get; protected set; }
+
     public virtual bool Init()
     {
         Console.Clear();
@@ -14,7 +16,8 @@ public class DotnetDriver : IConsoleDriver
 
     public void SetCursorPosition(Position position) => Console.SetCursorPosition(position.X, position.Y);
 
-    public void ResetColor() => Console.ResetColor();
+    public virtual void ResetColor() => Console.ResetColor();
+    public virtual void ResetStyle() => Console.ResetColor();
 
     public Position GetCursorPosition()
     {

src/Library/TerminalUI/ConsoleDrivers/IConsoleDriver.cs

@@ -5,10 +5,12 @@ namespace TerminalUI.ConsoleDrivers;
 
 public interface IConsoleDriver
 {
+    bool SupportsAnsiEscapeSequence { get; }
     bool Init();
     void Dispose();
     void SetCursorPosition(Position position);
     void ResetColor();
+    void ResetStyle();
     Position GetCursorPosition();
     void Write(string text);
     void Write(ReadOnlySpan<char> text);

src/Library/TerminalUI/ConsoleDrivers/XTermDriver.cs

@@ -8,6 +8,11 @@ public sealed class XTermDriver : DotnetDriver
 {
     private Position _initialCursorPosition;
 
+    public XTermDriver()
+    {
+        SupportsAnsiEscapeSequence = true;
+    }
+
     public override bool Init()
     {
         _initialCursorPosition = GetCursorPosition();
@@ -27,6 +32,11 @@ public sealed class XTermDriver : DotnetDriver
         SetCursorPosition(_initialCursorPosition);
     }
 
+    public override void ResetStyle()
+    {
+        Write("\x1b[0m");
+    }
+
     public override void SetBackgroundColor(IColor background)
     {
         if (background == SpecialColor.None) return;

src/Library/TerminalUI/Controls/Border.cs

@@ -71,7 +71,7 @@ public sealed partial class Border<T> : ContentView<Border<T>, T>, IDisplayView
         if (contentRendered)
         {
             var driver = renderContext.ConsoleDriver;
-            driver.ResetColor();
+            driver.ResetStyle();
             SetColorsForDriver(renderContext);
 
             RenderTopBorder(renderContext, position, size);

src/Library/TerminalUI/Controls/Grid.cs

@@ -170,13 +170,11 @@ public sealed class Grid<T> : ChildContainerView<Grid<T>, T>, IVisibilityChangeH
                 _forceRerenderChildren.Clear();
             }
 
-            var childContext = new RenderContext(
+            var childContext = context with
-                context.ConsoleDriver,
+            {
-                context.ForceRerender,
+                Foreground = Foreground ?? context.Foreground,
-                Foreground ?? context.Foreground,
+                Background = Background ?? context.Background,
-                Background ?? context.Background,
+            };
-                context.Statistics
-            );
             var viewsByPosition = GroupViewsByPosition(columnWidths.Length, rowHeights.Length);
 
             var anyRendered = false;
@@ -214,7 +212,6 @@ public sealed class Grid<T> : ChildContainerView<Grid<T>, T>, IVisibilityChangeH
         int row,
         IReadOnlyList<IView> forceRerenderChildren)
     {
-
         var width = columnWidths[column];
         var height = rowHeights[row];
         var renderSize = new Size(width, height);
@@ -253,7 +250,8 @@ public sealed class Grid<T> : ChildContainerView<Grid<T>, T>, IVisibilityChangeH
                 true,
                 context.Foreground,
                 context.Background,
-                context.Statistics
+                context.Statistics,
+                context.TextFormat
             );
             RenderEmpty(context, renderPosition, renderSize);
         }
@@ -270,7 +268,8 @@ public sealed class Grid<T> : ChildContainerView<Grid<T>, T>, IVisibilityChangeH
                     true,
                     context.Foreground,
                     context.Background,
-                    context.Statistics
+                    context.Statistics,
+                    context.TextFormat
                 );
             }
         }

src/Library/TerminalUI/Controls/ItemsControl.cs

@@ -85,7 +85,8 @@ public sealed partial class ItemsControl<TDataContext, TItem>
         double width = 0;
         double height = 0;
 
-        foreach (var child in _children)
+        var children = _children.ToList();
+        foreach (var child in children)
         {
             if (!child.IsVisible) continue;
 
@@ -149,13 +150,7 @@ public sealed partial class ItemsControl<TDataContext, TItem>
 
             if (forceRerenderChildren.Contains(child))
             {
-                var rerenderContext = new RenderContext(
+                var rerenderContext = renderContext with {ForceRerender = true};
-                    renderContext.ConsoleDriver,
-                    true,
-                    renderContext.Foreground,
-                    renderContext.Background,
-                    renderContext.Statistics
-                );
                 neededRerender = child.Render(rerenderContext, childPosition, childSize) || neededRerender;
             }
             else

src/Library/TerminalUI/Controls/ListView.cs

@@ -286,7 +286,7 @@ public sealed partial class ListView<TDataContext, TItem> : View<ListView<TDataC
 
         var driver = ApplicationContext!.ConsoleDriver;
         var placeholder = new string(' ', size.Width);
-        driver.ResetColor();
+        driver.ResetStyle();
         for (var i = deltaY; i < size.Height; i++)
         {
             driver.SetCursorPosition(position with {Y = position.Y + i});

src/Library/TerminalUI/Controls/ProgressBar.cs

@@ -111,7 +111,7 @@ public partial class ProgressBar<T> : View<ProgressBar<T>, T>
             };
         }
 
-        SetColor(driver, foreground, background);
+        SetStyleColor(renderContext, foreground, background);
 
         // Left border
         var textStartPosition = position;
@@ -132,7 +132,7 @@ public partial class ProgressBar<T> : View<ProgressBar<T>, T>
         // Transient character
         if (progressQuotientWidth < progressAvailableSpace)
         {
-            SetColor(driver, foreground, unfilledBackground);
+            SetStyleColor(renderContext, foreground, unfilledBackground);
             RenderText(
                 transientChar,
                 driver,
@@ -147,7 +147,7 @@ public partial class ProgressBar<T> : View<ProgressBar<T>, T>
             Span<char> unfilledText = stackalloc char[progressRemainderWidth];
             unfilledText.Fill(unfilledCharacter);
 
-            SetColor(driver, unfilledForeground, unfilledBackground);
+            SetStyleColor(renderContext, unfilledForeground, unfilledBackground);
             RenderText(
                 unfilledText,
                 driver,
@@ -159,7 +159,7 @@ public partial class ProgressBar<T> : View<ProgressBar<T>, T>
         // Right border
         if (rightCap.HasValue)
         {
-            SetColor(driver, foreground, background);
+            SetStyleColor(renderContext, foreground, background);
             RenderText(
                 rightCap.Value,
                 driver,

src/Library/TerminalUI/Controls/Rectangle.cs

@@ -25,7 +25,7 @@ public sealed partial class Rectangle<T> : View<Rectangle<T>, T>, IDisplayView
         var driver = renderContext.ConsoleDriver;
 
         var s = new string(' ', size.Width);
-        driver.ResetColor();
+        driver.ResetStyle();
         if (color is not null)
         {
             driver.SetBackgroundColor(color);

src/Library/TerminalUI/Controls/StackPanel.cs

@@ -80,13 +80,7 @@ public sealed partial class StackPanel<T> : ChildContainerView<StackPanel<T>, T>
 
             if (forceRerenderChildren.Contains(child))
             {
-                var rerenderContext = new RenderContext(
+                var rerenderContext = renderContext with {ForceRerender = true};
-                    renderContext.ConsoleDriver,
-                    true,
-                    renderContext.Foreground,
-                    renderContext.Background,
-                    renderContext.Statistics
-                );
                 neededRerender = child.Render(rerenderContext, childPosition, childSize) || neededRerender;
             }
             else

src/Library/TerminalUI/Controls/TextBlock.cs

@@ -2,8 +2,8 @@
 using System.Diagnostics;
 using PropertyChanged.SourceGenerator;
 using TerminalUI.Color;
-using TerminalUI.Extensions;
 using TerminalUI.Models;
+using TerminalUI.TextFormat;
 using TerminalUI.Traits;
 
 namespace TerminalUI.Controls;
@@ -16,7 +16,8 @@ public sealed partial class TextBlock<T> : View<TextBlock<T>, T>, IDisplayView
         Size Size,
         string? Text,
         IColor? Foreground,
-        IColor? Background);
+        IColor? Background,
+        ITextFormat? TextFormat);
 
     private RenderState? _lastRenderState;
     private string[]? _textLines;
@@ -24,17 +25,13 @@ public sealed partial class TextBlock<T> : View<TextBlock<T>, T>, IDisplayView
 
     [Notify] private string? _text = string.Empty;
     [Notify] private TextAlignment _textAlignment = TextAlignment.Left;
+    [Notify] private ITextFormat? _textFormat;
 
     public TextBlock()
     {
-        /*this.Bind(
-            this,
-            dc => dc == null ? string.Empty : dc.ToString(),
-            tb => tb.Text
-        );*/
-
         RerenderProperties.Add(nameof(Text));
         RerenderProperties.Add(nameof(TextAlignment));
+        RerenderProperties.Add(nameof(TextFormat));
 
         ((INotifyPropertyChanged) this).PropertyChanged += (o, e) =>
         {
@@ -58,7 +55,8 @@ public sealed partial class TextBlock<T> : View<TextBlock<T>, T>, IDisplayView
             size,
             Text,
             foreground,
-            background);
+            background,
+            _textFormat);
 
         if (!renderContext.ForceRerender && !NeedsRerender(renderState)) return false;
 
@@ -78,7 +76,7 @@ public sealed partial class TextBlock<T> : View<TextBlock<T>, T>, IDisplayView
         _placeholderRenderDone = false;
 
         var driver = renderContext.ConsoleDriver;
-        SetColor(driver, foreground, background);
+        SetStyleColor(renderContext, foreground, background, _textFormat);
 
         RenderText(_textLines, driver, position, size, TransformText);
 

src/Library/TerminalUI/Controls/TextBox.cs

@@ -104,7 +104,7 @@ public sealed partial class TextBox<T> : View<TextBox<T>, T>, IFocusable, IDispl
         _lastRenderState = renderStatus;
 
         var driver = renderContext.ConsoleDriver;
-        SetColor(driver, foreground, background);
+        SetStyleColor(renderContext, foreground, background);
 
         RenderEmpty(renderContext, position, size);
 

src/Library/TerminalUI/Controls/View.cs

@@ -8,6 +8,7 @@ using PropertyChanged.SourceGenerator;
 using TerminalUI.Color;
 using TerminalUI.ConsoleDrivers;
 using TerminalUI.Models;
+using TerminalUI.TextFormat;
 using TerminalUI.Traits;
 
 namespace TerminalUI.Controls;
@@ -175,12 +176,12 @@ public abstract partial class View<TConcrete, T> : IView<T> where TConcrete : Vi
         bool renderResult;
         if (Background != null || Foreground != null)
         {
-            var newRenderContext = new RenderContext(
+            var newRenderContext = renderContext with
-                renderContext.ConsoleDriver,
+            {
-                renderContext.ForceRerender,
+                Foreground = Foreground ?? renderContext.Foreground,
-                Foreground ?? renderContext.Foreground,
+                Background = Background ?? renderContext.Background
-                Background ?? renderContext.Background,
+            };
-                renderContext.Statistics);
+
             renderResult = RenderMethod(newRenderContext, position, size);
         }
         else
@@ -202,7 +203,7 @@ public abstract partial class View<TConcrete, T> : IView<T> where TConcrete : Vi
     protected void RenderEmpty(in RenderContext renderContext, Position position, Size size)
     {
         var driver = renderContext.ConsoleDriver;
-        driver.ResetColor();
+        driver.ResetStyle();
 
         var placeHolder = new string(ApplicationContext!.EmptyCharacter, size.Width);
         for (var i = 0; i < size.Height; i++)
@@ -309,13 +310,24 @@ public abstract partial class View<TConcrete, T> : IView<T> where TConcrete : Vi
             driver.Write(contentString);
         }
     }
-    protected void SetColor(IConsoleDriver driver, IColor? foreground, IColor? background)
+
+    protected void SetStyleColor(
+        in RenderContext renderContext,
+        IColor? foreground = null,
+        IColor? background = null,
+        ITextFormat? textFormat = null)
     {
+        var driver = renderContext.ConsoleDriver;
         driver.ResetColor();
+        if (textFormat is { } t)
+        {
+            t.ApplyFormat(driver, renderContext.TextFormat);
+        }
         if (foreground is not null)
         {
             driver.SetForegroundColor(foreground);
         }
+
         if (background is not null)
         {
             driver.SetBackgroundColor(background);
@@ -324,11 +336,9 @@ public abstract partial class View<TConcrete, T> : IView<T> where TConcrete : Vi
 
     protected void SetColorsForDriver(in RenderContext renderContext)
     {
-        var driver = renderContext.ConsoleDriver;
-
         var foreground = Foreground ?? renderContext.Foreground;
         var background = Background ?? renderContext.Background;
-        SetColor(driver, foreground, background);
+        SetStyleColor(renderContext, foreground, background);
     }
 
     public TChild CreateChild<TChild>() where TChild : IView<T>, new()

src/Library/TerminalUI/ExpressionTrackers/ExpressionTrackerBase.cs

@@ -6,7 +6,8 @@ namespace TerminalUI.ExpressionTrackers;
 public abstract class ExpressionTrackerBase : IExpressionTracker
 {
     private object? _currentValue;
-    public List<string> TrackedPropertyNames { get; } = new();
+    private readonly List<IExpressionTracker> _propertyProxyTrackers = new();
+    private readonly List<string> _trackedPropertyNames = new();
 
     protected bool SubscribeToValueChanges { get; set; } = true;
 
@@ -15,10 +16,22 @@ public abstract class ExpressionTrackerBase : IExpressionTracker
     public object? GetValue() => _currentValue;
     protected abstract object? ComputeValue();
 
-    protected void SubscribeToTracker(IExpressionTracker? expressionTracker)
+    protected void SubscribeToTracker(IExpressionTracker? expressionTracker, bool proxyPropertyChanged = false)
     {
         if (expressionTracker is null) return;
+
         expressionTracker.Update += UpdateValueAndChangeTrackers;
+
+        if (proxyPropertyChanged)
+        {
+            expressionTracker.PropertyChanged += OnPropertyChanged;
+            _propertyProxyTrackers.Add(expressionTracker);
+
+            foreach (var propertyName in _trackedPropertyNames)
+            {
+                expressionTracker.TrackProperty(propertyName);
+            }
+        }
     }
 
     protected void UpdateValueAndChangeTrackers() => UpdateValueAndChangeTrackers(true);
@@ -74,9 +87,24 @@ public abstract class ExpressionTrackerBase : IExpressionTracker
     {
         if (e.PropertyName is null) return;
 
-        if (TrackedPropertyNames.Contains(e.PropertyName))
+        if (_trackedPropertyNames.Contains(e.PropertyName))
         {
             PropertyChanged?.Invoke(e.PropertyName);
         }
     }
+
+    protected void OnPropertyChanged(string propertyName) => PropertyChanged?.Invoke(propertyName);
+
+    public void TrackProperty(string propertyName)
+    {
+        if (!_trackedPropertyNames.Contains(propertyName))
+        {
+            _trackedPropertyNames.Add(propertyName);
+        }
+
+        foreach (var propertyProxyTracker in _propertyProxyTrackers)
+        {
+            propertyProxyTracker.TrackProperty(propertyName);
+        }
+    }
 }

src/Library/TerminalUI/ExpressionTrackers/IExpressionTracker.cs

@@ -2,8 +2,8 @@
 
 public interface IExpressionTracker
 {
-    List<string> TrackedPropertyNames { get; }
     event Action<string>? PropertyChanged;
     event Action<bool>? Update;
     object? GetValue();
+    void TrackProperty(string propertyName);
 }

src/Library/TerminalUI/ExpressionTrackers/MemberTracker.cs

@@ -28,7 +28,7 @@ public sealed class MemberTracker : ExpressionTrackerBase
         if (memberExpression.Member is PropertyInfo propertyInfo)
         {
             _memberName = propertyInfo.Name;
-            parentTracker?.TrackedPropertyNames.Add(propertyInfo.Name);
+            parentTracker?.TrackProperty(propertyInfo.Name);
 
             if (propertyInfo.GetMethod is { } getMethod)
             {
@@ -44,7 +44,7 @@ public sealed class MemberTracker : ExpressionTrackerBase
         else if (memberExpression.Member is FieldInfo fieldInfo)
         {
             _memberName = fieldInfo.Name;
-            parentTracker?.TrackedPropertyNames.Add(fieldInfo.Name);
+            parentTracker?.TrackProperty(fieldInfo.Name);
 
             _valueProvider = () => CallFieldInfo(fieldInfo);
         }

src/Library/TerminalUI/ExpressionTrackers/UnaryTracker.cs

@@ -23,7 +23,7 @@ public class UnaryTracker : ExpressionTrackerBase
             _ => throw new NotSupportedException($"Unary expression of type {unaryExpression.NodeType} is not supported.")
         };
 
-        SubscribeToTracker(operandTracker);
+        SubscribeToTracker(operandTracker, true);
 
         UpdateValueAndChangeTrackers();
     }

src/Library/TerminalUI/Models/RenderContext.cs

@@ -1,6 +1,7 @@
 using System.Diagnostics;
 using TerminalUI.Color;
 using TerminalUI.ConsoleDrivers;
+using TerminalUI.TextFormat;
 
 namespace TerminalUI.Models;
 
@@ -8,19 +9,21 @@ namespace TerminalUI.Models;
 public readonly ref struct RenderContext
 {
     private static int _renderId;
-    public readonly int RenderId;
+    public int RenderId { get; init; }
-    public readonly IConsoleDriver ConsoleDriver;
+    public IConsoleDriver ConsoleDriver { get; init; }
-    public readonly bool ForceRerender;
+    public bool ForceRerender { get; init; }
-    public readonly IColor? Foreground;
+    public IColor? Foreground { get; init; }
-    public readonly IColor? Background;
+    public IColor? Background { get; init; }
-    public readonly RenderStatistics Statistics;
+    public RenderStatistics Statistics { get; init; }
+    public TextFormatContext TextFormat { get; init; }
 
     public RenderContext(
         IConsoleDriver consoleDriver,
         bool forceRerender,
         IColor? foreground,
         IColor? background,
-        RenderStatistics statistics)
+        RenderStatistics statistics,
+        TextFormatContext textFormat)
     {
         RenderId = _renderId++;
 
@@ -29,6 +32,7 @@ public readonly ref struct RenderContext
         Foreground = foreground;
         Background = background;
         Statistics = statistics;
+        TextFormat = textFormat;
     }
 
     public static RenderContext Empty =>
@@ -37,6 +41,7 @@ public readonly ref struct RenderContext
             false,
             null,
             null,
-            new RenderStatistics()
+            new RenderStatistics(),
+            new TextFormatContext(false)
         );
 }

src/Library/TerminalUI/RenderEngine.cs

@@ -1,5 +1,6 @@
 using TerminalUI.Controls;
 using TerminalUI.Models;
+using TerminalUI.TextFormat;
 using TerminalUI.Traits;
 
 namespace TerminalUI;
@@ -83,7 +84,8 @@ public class RenderEngine : IRenderEngine
                 true,
                 null,
                 null,
-                new RenderStatistics()
+                new RenderStatistics(),
+                new TextFormatContext(driver.SupportsAnsiEscapeSequence)
             ),
             initialPosition,
             size);
@@ -95,7 +97,8 @@ public class RenderEngine : IRenderEngine
                 false,
                 null,
                 null,
-                new RenderStatistics()
+                new RenderStatistics(),
+                new TextFormatContext(driver.SupportsAnsiEscapeSequence)
             ),
             initialPosition,
             size);

src/Library/TerminalUI/TextFormat/AnsiFormat.cs

@@ -0,0 +1,25 @@
+using TerminalUI.ConsoleDrivers;
+
+namespace TerminalUI.TextFormat;
+
+public class AnsiFormat : ITextFormat
+{
+    public bool IsUnderline { get; set; }
+    public bool IsItalic { get; set; }
+    public bool IsBold { get; set; }
+    public bool CanApply(TextFormatContext context) => context.SupportsAnsi;
+
+    public void ApplyFormat(IConsoleDriver consoleDriver, TextFormatContext context)
+    {
+        if (!context.SupportsAnsi) return;
+        
+        if (IsUnderline)
+            consoleDriver.Write("\x01b[4m");
+
+        if (IsItalic)
+            consoleDriver.Write("\x01b[3m");
+
+        if (IsBold)
+            consoleDriver.Write("\x01b[1m");
+    }
+}

src/Library/TerminalUI/TextFormat/EmptyFormat.cs

@@ -0,0 +1,13 @@
+using TerminalUI.ConsoleDrivers;
+
+namespace TerminalUI.TextFormat;
+
+public readonly struct EmptyFormat : ITextFormat
+{
+    public static EmptyFormat Instance => new();
+    public bool CanApply(TextFormatContext context) => true;
+
+    public void ApplyFormat(IConsoleDriver consoleDriver, TextFormatContext context)
+    {
+    }
+}

src/Library/TerminalUI/TextFormat/FormatCollection.cs

@@ -0,0 +1,23 @@
+using TerminalUI.ConsoleDrivers;
+
+namespace TerminalUI.TextFormat;
+
+public class FormatCollection : ITextFormat
+{
+    public List<ITextFormat> Formats { get; } = new();
+
+    public Func<IReadOnlyList<ITextFormat>, TextFormatContext, bool> CanApplyPredicate { get; set; } = DefaultCanApplyPredicate;
+
+    public bool CanApply(TextFormatContext context) => CanApplyPredicate(Formats, context);
+
+    public void ApplyFormat(IConsoleDriver consoleDriver, TextFormatContext context)
+    {
+        foreach (var format in Formats)
+        {
+            format.ApplyFormat(consoleDriver, context);
+        }
+    }
+
+    public static bool DefaultCanApplyPredicate(IReadOnlyList<ITextFormat> formats, TextFormatContext context) 
+        => formats.Any(format => format.CanApply(context));
+}

src/Library/TerminalUI/TextFormat/ITextFormat.cs

@@ -0,0 +1,9 @@
+using TerminalUI.ConsoleDrivers;
+
+namespace TerminalUI.TextFormat;
+
+public interface ITextFormat
+{
+    bool CanApply(TextFormatContext context);
+    void ApplyFormat(IConsoleDriver consoleDriver, TextFormatContext context);
+}

src/Library/TerminalUI/TextFormat/OrFormat.cs

@@ -0,0 +1,23 @@
+using TerminalUI.ConsoleDrivers;
+
+namespace TerminalUI.TextFormat;
+
+public class OrFormat : ITextFormat
+{
+    public required ITextFormat Format1 { get; set; }
+    public required ITextFormat Format2 { get; set; }
+
+    public bool CanApply(TextFormatContext context) => true;
+
+    public void ApplyFormat(IConsoleDriver consoleDriver, TextFormatContext context)
+    {
+        if (Format1.CanApply(context))
+        {
+            Format1.ApplyFormat(consoleDriver, context);
+        }
+        else
+        {
+            Format2.ApplyFormat(consoleDriver, context);
+        }
+    }
+}

src/Library/TerminalUI/TextFormat/SimpleFormat.cs

@@ -0,0 +1,20 @@
+using TerminalUI.Color;
+using TerminalUI.ConsoleDrivers;
+
+namespace TerminalUI.TextFormat;
+
+public class SimpleFormat : ITextFormat
+{
+    public IColor? Foreground { get; init; }
+    public IColor? Background { get; init; }
+    public bool CanApply(TextFormatContext context) => true;
+
+    public void ApplyFormat(IConsoleDriver consoleDriver, TextFormatContext context)
+    {
+        if (Foreground is not null)
+            consoleDriver.SetForegroundColor(Foreground);
+
+        if (Background is not null)
+            consoleDriver.SetBackgroundColor(Background);
+    }
+}

src/Library/TerminalUI/TextFormat/TextFormatContext.cs

@@ -0,0 +1,11 @@
+namespace TerminalUI.TextFormat;
+
+public readonly struct TextFormatContext
+{
+    public readonly bool SupportsAnsi;
+
+    public TextFormatContext(bool supportsAnsi)
+    {
+        SupportsAnsi = supportsAnsi;
+    }
+}