Monaco Editor UWP

A Windows Runtime Component wrapper around the web-based Monaco Editor. This allows the Monaco Editor to be more easily consumed directly in XAML for C# UWP based projects.

This project is not affiliated with the Monaco team and is provided for convenience. Please direct issues related to the use of this control wrapper to this repository.

This control is still in an early alpha state. Currently, every minor version change may signal breaking changes.

Supported Features

The following Monaco Editor features are currently supported by this component bridge:

• Two-way Text Binding
• Code Language for Syntax Highlighting
• Stand Alone Code Editor Options
• Markers and Decorations (See #35)
• Actions and Commands
• Basic Language Features
  • CodeAction (Commands and/or Edits)
  • CodeLens (onDidChange not supported)
  • Color
  • CompletionItem (IntelliSense, Snippets)
  • Hover
• Basic ITextModel Support (including FindMatches)
• KeyDown Events
• Responds Appropriately to Programmatic Focus Events
• Render Aware: Only displays once Loading is complete.
• Out-of-process WebView usage.

Usage

A NuGet Package is provided:

Install-Package Monaco.Editor -Version 0.9.0-beta

Look at the TestApp for current usage and basic examples. See changelog for more info.

Monaco API Notes

This project maintains two tenants with regards to the core web-based Monaco API:

1. Keep API names and patterns as closely mapped as possible to enable straight-forward re-usage of existing TypeScript examples.
2. Swap types to existing C#/WinRT based ones for easier interop with the calling application.

Effectively, we want this project to be as easy to integrate with existing C#/WinRT skills/knowledge as possible as well as providing a similar enough API that it's easy to still utilize any existing knowledge bases for the Monaco API.

There are some common caveats though called out here:

• Pretty much all functions are asynchronous and end with the C# Async naming suffix convention.

• The Monaco.Languages namespace is mapped through the CodeEditor instance, so call <Editor Instance>.Languages.* for any of those APIs. E.g.

  // JavaScript
  monaco.languages.registerColorProvider("colorLanguage", ...

  // C#
  var MonacoEditor = new CodeEditor(); // Either done through XAML or elsewhere once.
  ...
  MonacoEditor.Languages.RegisterColorProviderAsync("colorLanguage", ...

  This is required due to need to execute the code within a particular WebView instance hosting the Monaco control, there is no global execution context. Therefore, you must register any language providers individually to each CodeEditor instance.

• Returns using IAsyncOperation<T> usually need to use the AsyncInfo.Run system interop helper. See Issue #45.

• Uri class is not mapped yet to a built-in C# type. See Issue #33.

• Keyboard Events can't use the built-in system KeyRoutedEventArgs class as it is sealed. (See microsoft/microsoft-ui-xaml#5475)

• Decorations use CSS class names in Monaco, this has been ported to be a strongly-typed abstraction per type of styled element required for use of decorations. Each style type has a set or properties using common WinRT types associated with styling UI elements like SolidColorBrush, TextDecoration, FontStyle, etc... If a property is missing that you require, please open an issue or PR to modify the corresponding ICssStyle implementations.

Build Notes

Built using Visual Studio 2019 for Windows 10 17763 and above.

The released complete Monaco v0.21.3 build is used as a reference, this is not included in this repository and can be downloaded from the Monaco site. The contents of its uncompressed 'package' directory should be placed in the MonacoEditorComponent/monaco-editor directory. The install-dependencies.ps1 PowerShell script can install this for you automatically.

This component currently won't move beyond Monaco v0.22.3 as it is the last version compatible with the UWP WebView component running the Legacy Microsoft Edge engine. However, that version seems to have other issues running in Edge as well, so we have last tested with v0.21.3. In the future we'll investigate moving to WebView2.

In order to re-generate C# typings from a version of Monaco, see the GenerateMonacoTypings Node.js project readme here.

License

MIT