(#281) WinForms: initial support

WinFormsApp.Example/Form1.cs

@@ -0,0 +1,19 @@
+using WinFormsMath.Controls;
+
+namespace WinFormsApp.Example;
+
+public partial class Form1 : Form
+{
+    public Form1()
+    {
+        InitializeComponent();
+        var control = new FormulaControl();
+        Controls.Add(control);
+
+        control.Top = 5;
+        control.Left = 5;
+        control.Width = Width - 5;
+        control.Height = Height - 5;
+        control.FormulaText = @"\sqrt 2";
+    }
+}

WinFormsApp.Example/Program.cs

@@ -0,0 +1,16 @@
+namespace WinFormsApp.Example;
+
+static class Program
+{
+    /// <summary>
+    ///  The main entry point for the application.
+    /// </summary>
+    [STAThread]
+    static void Main()
+    {
+        // To customize application configuration such as set high DPI settings or default font,
+        // see https://aka.ms/applicationconfiguration.
+        ApplicationConfiguration.Initialize();
+        Application.Run(new Form1());
+    }
+}

WinFormsApp.Example/WinFormsApp.Example.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>WinExe</OutputType>
+        <TargetFramework>net7.0-windows</TargetFramework>
+        <Nullable>enable</Nullable>
+        <UseWindowsForms>true</UseWindowsForms>
+        <ImplicitUsings>enable</ImplicitUsings>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\src\WinFormsMath\WinFormsMath.csproj" />
+    </ItemGroup>
+
+</Project>

XamlMath.All.sln

@@ -82,6 +82,10 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "api", "api", "{3F2FED19-93A
 		api\XamlMath.Shared.net6.0.verified.cs = api\XamlMath.Shared.net6.0.verified.cs
 	EndProjectSection
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WinFormsMath", "src\WinFormsMath\WinFormsMath.csproj", "{4236794D-83A5-46B8-8F1C-8777D525DCD9}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WinFormsApp.Example", "WinFormsApp.Example\WinFormsApp.Example.csproj", "{7AD0440C-A9E8-4153-883C-B595E8B7346F}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -124,6 +128,14 @@ Global
 		{54F77EF7-F918-46F8-A615-56BC0BFE8AAB}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{54F77EF7-F918-46F8-A615-56BC0BFE8AAB}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{54F77EF7-F918-46F8-A615-56BC0BFE8AAB}.Release|Any CPU.Build.0 = Release|Any CPU
+		{4236794D-83A5-46B8-8F1C-8777D525DCD9}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4236794D-83A5-46B8-8F1C-8777D525DCD9}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4236794D-83A5-46B8-8F1C-8777D525DCD9}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4236794D-83A5-46B8-8F1C-8777D525DCD9}.Release|Any CPU.Build.0 = Release|Any CPU
+		{7AD0440C-A9E8-4153-883C-B595E8B7346F}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{7AD0440C-A9E8-4153-883C-B595E8B7346F}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{7AD0440C-A9E8-4153-883C-B595E8B7346F}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{7AD0440C-A9E8-4153-883C-B595E8B7346F}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

src/WinFormsMath/Controls/FormulaControl.cs

@@ -0,0 +1,21 @@
+using WinFormsMath.Parsers;
+using WinFormsMath.Rendering;
+using XamlMath.Rendering;
+
+namespace WinFormsMath.Controls;
+
+public class FormulaControl : Control
+{
+    public string FormulaText { get; set; } // TODO: Naming?
+
+    protected override void OnPaint(PaintEventArgs e)
+    {
+        base.OnPaint(e);
+
+        var texFormula = WinFormsFormulaParser.Instance.Parse(FormulaText);
+        var environment = WinFormsTeXEnvironment.Create();
+
+        var renderer = new WinFormsRenderer(e.Graphics);
+        texFormula.RenderTo(renderer, environment, 0.0, 0.0);
+    }
+}

src/WinFormsMath/Fonts/WinFormsGlyphTypeface.cs

@@ -0,0 +1,5 @@
+using XamlMath.Fonts;
+
+namespace WinFormsMath.Fonts;
+
+internal record WinFormsGlyphTypeface(Font Font) : IFontTypeface;

src/WinFormsMath/Fonts/WinFormsMathFontProvider.cs

@@ -0,0 +1,30 @@
+using System.Drawing.Text;
+using XamlMath.Fonts;
+using XamlMath.Utils;
+
+namespace WinFormsMath.Fonts;
+
+/// <summary>A font provider implementation specifically for the WinFormsMath assembly.</summary>
+internal class WinFormsMathFontProvider : IFontProvider
+{
+    private WinFormsMathFontProvider() {}
+
+    public static WinFormsMathFontProvider Instance = new();
+
+    private const string FontsDirectory = "WinFormsMath.Fonts";
+
+    public unsafe IFontTypeface ReadFontFile(string fontFileName)
+    {
+        using var resource = typeof(WinFormsMathFontProvider).Assembly.ReadResource($"{FontsDirectory}.{fontFileName}");
+        using var byteStream = new MemoryStream();
+        resource.CopyTo(byteStream);
+        var bytes = byteStream.ToArray();
+
+        var c = new PrivateFontCollection(); // TODO: Dispose?
+        fixed (byte* p = bytes)
+            c.AddMemoryFont((IntPtr)p, bytes.Length);
+
+        var ff = c.Families.Single();
+        return new WinFormsGlyphTypeface(new Font(ff, 1.0f));
+    }
+}

src/WinFormsMath/Fonts/WinFormsSystemFont.cs

@@ -0,0 +1,114 @@
+using XamlMath;
+using XamlMath.Exceptions;
+using XamlMath.Fonts;
+using XamlMath.Utils;
+
+namespace WinFormsMath.Fonts;
+
+internal class WinFormsSystemFont : ITeXFont
+{
+    private readonly Lazy<Font> _font;
+
+    public WinFormsSystemFont(double size, FontFamily fontFamily)
+    {
+        Size = size;
+        _font = new Lazy<Font>(() => new Font(fontFamily, (float)Size));
+    }
+
+    public bool SupportsMetrics => false;
+
+    public double Size { get; }
+
+    public ExtensionChar GetExtension(CharInfo charInfo, TexStyle style) =>
+        throw MethodNotSupported(nameof(GetExtension));
+
+    public CharFont? GetLigature(CharFont leftChar, CharFont rightChar) => null;
+
+    public CharInfo GetNextLargerCharInfo(CharInfo charInfo, TexStyle style) =>
+        throw MethodNotSupported(nameof(GetNextLargerCharInfo));
+
+    public Result<CharInfo> GetDefaultCharInfo(char character, TexStyle style) =>
+        Result.Error<CharInfo>(MethodNotSupported(nameof(this.GetDefaultCharInfo)));
+
+    public Result<CharInfo> GetCharInfo(char character, string textStyle, TexStyle style)
+    {
+        var font = _font.Value;
+        var metrics = GetFontMetrics(character, font);
+        return Result.Ok(
+            new CharInfo(character, new WinFormsGlyphTypeface(font), 1.0, TexFontUtilities.NoFontId, metrics));
+    }
+
+    public Result<CharInfo> GetCharInfo(CharFont charFont, TexStyle style) =>
+        Result.Error<CharInfo>(MethodNotSupported(nameof(this.GetCharInfo)));
+
+    public Result<CharInfo> GetCharInfo(string name, TexStyle style) =>
+        Result.Error<CharInfo>(MethodNotSupported(nameof(GetCharInfo)));
+
+    public double GetKern(CharFont leftChar, CharFont rightChar, TexStyle style) => 0.0;
+
+    public double GetQuad(int fontId, TexStyle style) => throw MethodNotSupported(nameof(GetQuad));
+
+    public double GetSkew(CharFont charFont, TexStyle style) => throw MethodNotSupported(nameof(GetSkew));
+
+    public bool HasSpace(int fontId) => throw MethodNotSupported(nameof(HasSpace));
+
+    public bool HasNextLarger(CharInfo charInfo) => throw MethodNotSupported(nameof(HasNextLarger));
+
+    public bool IsExtensionChar(CharInfo charInfo) => throw MethodNotSupported(nameof(IsExtensionChar));
+
+    public int GetMuFontId() => throw MethodNotSupported(nameof(GetMuFontId));
+
+    public double GetXHeight(TexStyle style, int fontId) => throw MethodNotSupported(nameof(GetXHeight));
+
+    public double GetSpace(TexStyle style) => throw MethodNotSupported(nameof(GetSpace));
+
+    public double GetAxisHeight(TexStyle style) => throw MethodNotSupported(nameof(GetAxisHeight));
+
+    public double GetBigOpSpacing1(TexStyle style) => throw MethodNotSupported(nameof(GetBigOpSpacing1));
+
+    public double GetBigOpSpacing2(TexStyle style) => throw MethodNotSupported(nameof(GetBigOpSpacing2));
+
+    public double GetBigOpSpacing3(TexStyle style) => throw MethodNotSupported(nameof(GetBigOpSpacing3));
+
+    public double GetBigOpSpacing4(TexStyle style) => throw MethodNotSupported(nameof(GetBigOpSpacing4));
+
+    public double GetBigOpSpacing5(TexStyle style) => throw MethodNotSupported(nameof(GetBigOpSpacing5));
+
+    public double GetSub1(TexStyle style) => throw MethodNotSupported(nameof(GetSub1));
+
+    public double GetSub2(TexStyle style) => throw MethodNotSupported(nameof(GetSub2));
+
+    public double GetSubDrop(TexStyle style) => throw MethodNotSupported(nameof(GetSubDrop));
+
+    public double GetSup1(TexStyle style) => throw MethodNotSupported(nameof(GetSup1));
+
+    public double GetSup2(TexStyle style) => throw MethodNotSupported(nameof(GetSup2));
+
+    public double GetSup3(TexStyle style) => throw MethodNotSupported(nameof(GetSup3));
+
+    public double GetSupDrop(TexStyle style) => throw MethodNotSupported(nameof(GetSupDrop));
+
+    public double GetNum1(TexStyle style) => throw MethodNotSupported(nameof(GetNum1));
+
+    public double GetNum2(TexStyle style) => throw MethodNotSupported(nameof(GetNum2));
+
+    public double GetNum3(TexStyle style) => throw MethodNotSupported(nameof(GetNum3));
+
+    public double GetDenom1(TexStyle style) => throw MethodNotSupported(nameof(GetDenom1));
+
+    public double GetDenom2(TexStyle style) => throw MethodNotSupported(nameof(GetDenom2));
+
+    public double GetDefaultLineThickness(TexStyle style) => throw MethodNotSupported(nameof(GetDefaultLineThickness));
+
+    private static TexNotSupportedException MethodNotSupported(string callerMethod)
+    {
+        return new TexNotSupportedException(
+            $"Call of method {callerMethod} on {nameof(WinFormsSystemFont)} is not supported");
+    }
+
+    private static TeXFontMetrics GetFontMetrics(char c, Font font)
+    {
+        var size = TextRenderer.MeasureText(c.ToString(), font);
+        return new TeXFontMetrics(size.Width, size.Height, 0.0, size.Width, 1.0);
+    }
+}

src/WinFormsMath/Parsers/WinFormsFormulaParser.cs

@@ -0,0 +1,22 @@
+using WinFormsMath.Rendering;
+using XamlMath;
+
+namespace WinFormsMath.Parsers;
+
+public static class WinFormsFormulaParser
+{
+    public static TexFormulaParser Instance { get; }
+    static WinFormsFormulaParser()
+    {
+        var predefinedFormulae = LoadPredefinedFormulae();
+        Instance = new TexFormulaParser(WinFormsBrushFactory.Instance, predefinedFormulae);
+    }
+
+    private static IReadOnlyDictionary<string, Func<SourceSpan, TexFormula?>> LoadPredefinedFormulae()
+    {
+        var predefinedFormulaParser = new TexPredefinedFormulaParser(WinFormsBrushFactory.Instance);
+        var predefinedFormulae = new Dictionary<string, Func<SourceSpan, TexFormula?>>();
+        predefinedFormulaParser.Parse(predefinedFormulae);
+        return predefinedFormulae;
+    }
+}

src/WinFormsMath/Rendering/WinFormsBrush.cs

@@ -0,0 +1,32 @@
+using System.Diagnostics.CodeAnalysis;
+using XamlMath.Colors;
+using XamlMath.Rendering;
+
+namespace WinFormsMath.Rendering;
+
+public record WinFormsBrush : GenericBrush<Brush>
+{
+    private WinFormsBrush(Brush brush) : base(brush)
+    {
+    }
+
+    public static WinFormsBrush FromBrush(Brush value) => new(value);
+}
+
+public class WinFormsBrushFactory : IBrushFactory
+{
+    public static readonly WinFormsBrushFactory Instance = new();
+
+    private WinFormsBrushFactory() {}
+
+    public IBrush FromColor(RgbaColor color) =>
+        new SolidBrush(
+            Color.FromArgb(color.A, color.R, color.G, color.B)).ToPlatform();
+}
+
+public static class WinFormsBrushExtensions
+{
+    public static Brush? ToWinForms(this IBrush? brush) => ((WinFormsBrush?)brush)?.Value;
+    [return: NotNullIfNotNull(nameof(brush))]
+    public static IBrush? ToPlatform(this Brush? brush) => brush == null ? null : WinFormsBrush.FromBrush(brush);
+}

src/WinFormsMath/Rendering/WinFormsRectangleExtensions.cs

@@ -0,0 +1,7 @@
+namespace WinFormsMath.Rendering;
+
+internal static class WinFormsRectangleExtensions
+{
+    public static RectangleF ToWinForms(this XamlMath.Rendering.Rectangle rectangle) =>
+        new((float)rectangle.X, (float)rectangle.Y, (float)rectangle.Width, (float)rectangle.Height);
+}