MonacoNative.WinUI3 0.8.0.44

MonacoNative.WinUI3

A personal hobby project for building a native WinUI 3 code editor without WebView2.

The editor uses a C++20 text core, a WinUI 3 / Win2D renderer, native Windows text input, and in-process language services. Monaco Editor and VS Code are used as behavior and implementation references where it makes sense.

Features

• Native text model, undo/redo, selections, multi-cursor editing, folding, minimap, find/replace, and diff view
• Syntax highlighting and language-aware indentation
• Completion UI with Codicons, fuzzy ranking, snippet choices, and Visual Studio-style parameter hints
• C# semantic features through in-process Roslyn
• C++ semantic features through in-process libclang
• Native C# / C++ ports for JSON, HTML, CSS, JavaScript, and TypeScript editing features
• VS Code (default) and Visual Studio keybinding profiles with WinUI host overrides
• C++ source formatting through optional LLVM clang-format
• WinUI 3 sample application with C#, C++, JSON, HTML, CSS, JavaScript, and TypeScript samples

Language coverage is listed in doc/LANGUAGE_SERVICES.md.

Screenshots

<table> <tr> <td width="50%" align="center"><strong>Dark theme</strong><br/><br/><img src="doc/images/editor-dark.png" alt="Dark theme" width="100%" /></td> <td width="50%" align="center"><strong>Light theme</strong><br/><br/><img src="doc/images/editor-light.png" alt="Light theme" width="100%" /></td> </tr> <tr> <td align="center"><strong>Completion</strong><br/><br/><img src="doc/images/completion.png" alt="Completion" width="100%" /></td> <td align="center"><strong>Editing</strong><br/><br/><img src="doc/images/editing.png" alt="Editing" width="100%" /></td> </tr> </table>

Build

Requirements:

• Visual Studio 2026 with Desktop development with C++ and .NET desktop development
• Windows SDK 10.0.26100.0
• .NET 10 SDK

Open MonacoNative.sln, select Debug | x64, restore NuGet packages, and run MonacoNative.SampleApp.

C# uses the Roslyn NuGet packages. C++ uses the fixed libclang runtime packages. JSON, HTML, CSS, JavaScript, and TypeScript services run from code in this repository. No Node.js or external language-server process is required for the built-in language packages.

More build details are in doc/BUILDING.md.

For individual Windows test layers use ./scripts/test.ps1 -Layer Build followed by -Layer Core, Services, WinUI, and Integration. -Layer All -RunPackages runs the complete automated path.

Documentation

• Architecture
• Language services
• Building
• Testing
• Keyboard shortcuts
• NuGet deployment and compatibility
• Standalone WinUI NuGet consumer
• Native ABI
• Upstream sources and licenses

License

Project code is licensed under the MIT License. Ported code, dependencies, and icons keep their original licenses and attribution. See THIRD_PARTY_NOTICES.md and doc/UPSTREAM.md.