Initial commit

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
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+
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+# Including strong name files can present a security risk
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+MigrationBackup/
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+# Ionide (cross platform F# VS Code tools) working folder
+.ionide/

AssemblyInfo.cs

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+using System.Windows;
+
+[assembly: ThemeInfo(
+    ResourceDictionaryLocation.None, //where theme specific resource dictionaries are located
+                                     //(used if a resource is not found in the page,
+                                     // or application resource dictionaries)
+    ResourceDictionaryLocation.SourceAssembly //where the generic resource dictionary is located
+                                              //(used if a resource is not found in the page,
+                                              // app, or any theme specific resource dictionaries)
+)]

HtmlTextBlock.cs

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+using System;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Documents;
+
+namespace ChrisKaczor.Wpf.Controls
+{
+    public class HtmlTextBlock : TextBlock
+    {
+        public static readonly DependencyProperty HtmlProperty = DependencyProperty.Register(nameof(Html), typeof(string), typeof(HtmlTextBlock), new UIPropertyMetadata("Html", OnHtmlChanged));
+
+        private static void OnHtmlChanged(DependencyObject s, DependencyPropertyChangedEventArgs e)
+        {
+            var htmlTextBlock = (HtmlTextBlock) s;
+
+            Parse(htmlTextBlock, e.NewValue as string);
+        }
+
+        private static void Parse(HtmlTextBlock control, string? value)
+        {
+            try
+            {
+                control.Inlines.Clear();
+
+                var parser = new TextParser();
+                var lines = parser.Parse(control, value);
+
+                foreach (var line in lines)
+                {
+                    foreach (var fragment in line.FragmentList)
+                    {
+                        var run = new Run(fragment.Text)
+                        {
+                            FontStyle = fragment.Style,
+                            FontWeight = fragment.Weight,
+                            FontSize = fragment.Size,
+                            Foreground = fragment.Color
+                        };
+
+                        control.Inlines.Add(run);
+                    }
+                }
+            }
+            catch (Exception)
+            {
+                control.Inlines.Clear();
+
+                control.Text = value;
+            }
+        }
+
+        public string Html
+        {
+            get => (string) GetValue(HtmlProperty);
+            set => SetValue(HtmlProperty, value);
+        }
+    }
+}

LICENSE

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+MIT License
+
+Copyright (c) 2023 Chris Kaczor
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# ChrisKaczor.Wpf.Controls.HtmlTextBlock
+
+A WPF control that extends the base TextBlock control with rudimentary support for some basic HTML formatting.
+
+## Authors
+
+* **Chris Kaczor** - *Initial work* - https://github.com/ckaczor - https://chriskaczor.com
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE.md](LICENSE.md) file for details.
+
+## Disclaimer
+
+This code is used by my various personal projects and may not be useful or work in all use cases.

TextFragment.cs

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+using System.Globalization;
+using System.Windows;
+using System.Windows.Media;
+
+namespace ChrisKaczor.Wpf.Controls
+{
+    public class TextFragment
+    {
+        private readonly HtmlTextBlock _parent;
+
+        public Brush Color { get; set; }
+        public FontStyle Style { get; set; }
+        public FontWeight Weight { get; set; }
+        public double Size { get; set; }
+        public string Text { get; set; }
+        public bool Underline { get; set; }
+
+        private Typeface? _typeface;
+
+        private Typeface Typeface
+        {
+            get { return _typeface ??= new Typeface(_parent.FontFamily, Style, Weight, _parent.FontStretch); }
+        }
+
+        private FormattedText? _formattedText;
+        public FormattedText FormattedText
+        {
+            get
+            {
+                if (_formattedText != null) 
+                    return _formattedText;
+
+                var measureText = string.IsNullOrEmpty(Text) ? " " : Text;
+
+                _formattedText = new FormattedText(measureText, CultureInfo.CurrentUICulture, FlowDirection.LeftToRight, Typeface, Size, Color, null, TextFormattingMode.Display, 1);
+
+                var textDecorationCollection = new TextDecorationCollection();
+
+                if (Underline)
+                {
+                    var underlineDecoration = new TextDecoration { PenThicknessUnit = TextDecorationUnit.FontRecommended };
+
+                    textDecorationCollection.Add(underlineDecoration);
+                }
+
+                _formattedText.SetTextDecorations(textDecorationCollection);
+
+                return _formattedText;
+            }
+        }
+
+        public TextFragment(HtmlTextBlock parent)
+        {
+            _parent = parent;
+
+            Color = _parent.Foreground;
+            Style = _parent.FontStyle;
+            Weight = _parent.FontWeight;
+            Size = _parent.FontSize;
+            Text = string.Empty;
+            Underline = false;
+        }
+    }
+}

TextFragmentStyle.cs

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+using System.Windows;
+using System.Windows.Media;
+
+namespace ChrisKaczor.Wpf.Controls
+{
+    public class TextFragmentStyle
+    {
+        public Brush? Color { get; set; }
+        public FontStyle? Style { get; init; }
+        public FontWeight? Weight { get; init; }
+        public double? Size { get; set; }
+        public bool? Underline { get; init; }
+
+        public void Apply(TextFragment fragment)
+        {
+            if (Color != null)
+                fragment.Color = Color;
+
+            if (Style.HasValue)
+                fragment.Style = Style.Value;
+
+            if (Weight.HasValue)
+                fragment.Weight = Weight.Value;
+
+            if (Size.HasValue)
+                fragment.Size = Size.Value;
+
+            if (Underline.HasValue)
+                fragment.Underline = Underline.Value;
+        }
+    }
+}

TextLine.cs

@@ -0,0 +1,14 @@
+using System.Collections.ObjectModel;
+
+namespace ChrisKaczor.Wpf.Controls
+{
+    public class TextLine
+    {
+        public Collection<TextFragment> FragmentList { get; }
+
+        public TextLine()
+        {
+            FragmentList = new Collection<TextFragment>();
+        }
+    }
+}

TextParser.cs

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+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Media;
+using System.Xml;
+
+namespace ChrisKaczor.Wpf.Controls
+{
+    public class TextParser
+    {
+        private HtmlTextBlock _parentControl = null!;
+
+        public Collection<TextLine> Parse(HtmlTextBlock parentControl, string? text)
+        {
+            _parentControl = parentControl;
+
+            text = text?.Replace("&", "&amp;");
+
+            // Add a root tag so the parser is happy
+            text = string.Format(CultureInfo.InvariantCulture, "<body>{0}</body>", text);
+
+            // Normalize line endings
+            text = text.Replace("\r\n", "\n");
+
+            // Create an XML document and load it with the text
+            var xmlDocument = new XmlDocument
+            {
+                PreserveWhitespace = true
+            };
+            xmlDocument.LoadXml(text);
+
+            // Create a list of text lines
+            var lines = new Collection<TextLine>();
+
+            // Walk over the nodes and build up the fragment list
+            WalkNodes(xmlDocument.ChildNodes, lines);
+
+            return lines;
+        }
+
+        private readonly Stack<TextFragmentStyle> _attributeStack = new();
+
+        private void WalkNodes(XmlNodeList xmlNodeList, Collection<TextLine> textLines)
+        {
+            if (textLines.Count == 0)
+                textLines.Add(new TextLine());
+
+            foreach (XmlNode xmlNode in xmlNodeList)
+            {
+                TextFragmentStyle style;
+
+                switch (xmlNode.Name.ToUpperInvariant())
+                {
+                    case "#WHITESPACE":
+                    case "#TEXT":
+
+                        // Split the fragment and the line endings
+                        var lines = xmlNode.Value!.Split('\n');
+
+                        var firstLine = true;
+
+                        foreach (var line in lines)
+                        {
+                            var textLine = (firstLine ? textLines[^1] : new TextLine());
+
+                            // Create a new fragment and fill the style information
+                            var textFragment = new TextFragment(_parentControl)
+                            {
+                                Text = line
+                            };
+
+                            foreach (var s in _attributeStack)
+                            {
+                                s.Apply(textFragment);
+                            }
+
+                            // Add the fragment to the list
+                            textLine.FragmentList.Add(textFragment);
+
+                            if (!firstLine)
+                                textLines.Add(textLine);
+
+                            firstLine = false;
+                        }
+
+                        break;
+
+                    case "EM":
+                    case "B":
+
+                        style = new TextFragmentStyle { Weight = FontWeights.Bold };
+                        _attributeStack.Push(style);
+
+                        break;
+
+                    case "U":
+
+                        style = new TextFragmentStyle { Underline = true };
+                        _attributeStack.Push(style);
+
+                        break;
+
+                    case "CITE":
+
+                        style = new TextFragmentStyle { Style = FontStyles.Italic };
+                        _attributeStack.Push(style);
+
+                        break;
+
+                    case "FONT":
+                        style = new TextFragmentStyle();
+
+                        if (xmlNode.Attributes == null)
+                            break;
+
+                        foreach (XmlAttribute attribute in xmlNode.Attributes)
+                        {
+                            switch (attribute.Name.ToUpperInvariant())
+                            {
+                                case "SIZE":
+                                    style.Size = Convert.ToDouble(attribute.Value, CultureInfo.InvariantCulture);
+                                    break;
+
+                                case "COLOR":
+                                    style.Color = (Brush?) new BrushConverter().ConvertFromString(attribute.Value);
+                                    break;
+                            }
+                        }
+
+                        _attributeStack.Push(style);
+                        break;
+                }
+
+                if (xmlNode.ChildNodes.Count > 0)
+                    WalkNodes(xmlNode.ChildNodes, textLines);
+
+                if (_attributeStack.Count > 0)
+                    _attributeStack.Pop();
+            }
+        }
+    }
+}

Wpf.Controls.HtmlTextBlock.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+	<PropertyGroup>
+		<TargetFramework>net7.0-windows</TargetFramework>
+		<Nullable>enable</Nullable>
+		<UseWPF>true</UseWPF>
+		<RootNamespace>ChrisKaczor.Wpf.Controls</RootNamespace>
+		<Title>ChrisKaczor.Wpf.Controls.HtmlTextBlock</Title>
+		<Authors>Chris Kaczor</Authors>
+		<Product>ChrisKaczor.Wpf.Controls.HtmlTextBlock</Product>
+		<RepositoryUrl>https://github.com/ckaczor/ChrisKaczor.Wpf.Controls.HtmlTextBlock</RepositoryUrl>
+		<PackageReadmeFile>README.md</PackageReadmeFile>
+		<Description>A WPF control that extends the base TextBlock control with rudimentary support for some basic HTML formatting.</Description>
+		<PackageId>ChrisKaczor.Wpf.Controls.HtmlTextBlock</PackageId>
+		<PackageReadmeFile>README.md</PackageReadmeFile>
+	</PropertyGroup>
+	<ItemGroup>
+		<None Update="README.md">
+			<Pack>True</Pack>
+			<PackagePath>\</PackagePath>
+		</None>
+	</ItemGroup>
+</Project>

Wpf.Controls.HtmlTextBlock.sln

@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.5.33424.131
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Wpf.Controls.HtmlTextBlock", "Wpf.Controls.HtmlTextBlock.csproj", "{F0451ABB-7CC2-4B11-84BA-3C4C5BCCA7A8}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F0451ABB-7CC2-4B11-84BA-3C4C5BCCA7A8}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F0451ABB-7CC2-4B11-84BA-3C4C5BCCA7A8}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F0451ABB-7CC2-4B11-84BA-3C4C5BCCA7A8}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F0451ABB-7CC2-4B11-84BA-3C4C5BCCA7A8}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {62FA8048-AB2E-4D82-A0B0-2AB28233C404}
+	EndGlobalSection
+EndGlobal

azure-pipelines.yml

@@ -0,0 +1,45 @@
+name: 1.0.$(Rev:r)
+
+pr: none
+
+trigger:
+  batch: 'true'
+  branches:
+    include:
+    - main
+
+pool:
+  vmImage: 'windows-latest'
+
+variables:
+  buildConfiguration: 'Release'
+
+steps:
+
+- task: DotNetCoreCLI@2
+  displayName: 'dotnet build'
+  inputs:
+    command: 'build'
+    arguments: '--configuration $(buildConfiguration)'
+    projects: 'Wpf.Controls.HtmlTextBlock.csproj'
+
+- task: DotNetCoreCLI@2
+  displayName: "dotnet pack"
+  inputs:
+    command: 'pack'
+    arguments: '--configuration $(buildConfiguration)'
+    packagesToPack: 'Wpf.Controls.HtmlTextBlock.csproj'
+    nobuild: true
+    versioningScheme: 'byBuildNumber'
+
+- task: NuGetCommand@2
+  displayName: 'nuget push'
+  inputs:
+    command: 'push'
+    feedsToUse: 'select'
+    packagesToPush: '$(Build.ArtifactStagingDirectory)/**/*.nupkg;!$(Build.ArtifactStagingDirectory)/**/*.symbols.nupkg'
+    nuGetFeedType: external
+    publishFeedCredentials: 'NuGet'
+    publishVstsFeed: 'Packages'
+    versioningScheme: 'byBuildNumber'
+    allowPackageConflicts: true