How to customize the line height of text sent on the Output window?

Question

I’m trying to use ILineTransformSourceProvider to customize the height of the lines sent on the “Output” window:

internal class LineTransformSource : ILineTransformSource
{
   public LineTransformSource()
   {
   }

   LineTransform ILineTransformSource.GetLineTransform(ITextViewLine line, double yPosition, ViewRelativePosition placement)
   {
      var lineNumber = line. Snapshot.GetLineFromPosition(line. Start.Position). LineNumber;
      return new LineTransform(0, 0, 1.0)
   }
}

[Export(typeof(ILineTransformSourceProvider))]
[
    //ContentType("any"),  // detects everything less the output window
    ContentType("C/C++"),  // works correctly
    ContentType("output"), // the class never get called
]
//[TextViewRole(PredefinedTextViewRoles.Document)]
internal class LineTransformSourceProvider : ILineTransformSourceProvider
{
   [Import]
   public ITextDocumentFactoryService TextDocumentFactory { get; set; }

   [Import]
   internal SVsServiceProvider ServiceProvider = null;

   ILineTransformSource ILineTransformSourceProvider.Create(IWpfTextView view)
   {
      return new LineTransformSource();
   }
} 

The LineTransformSourceProvider class is not getting called for the “output” content type, it works with any other window like a .h or .cpp files.

An example of what I’m trying to achieve, modifying the line heights on a .cpp file: “Output Window” I’m referring to this window where you can output debug data ContentType("output") seems to be the correct “content type”, I’m using IViewTaggerProvider and it does work correctly, just LineTransformSourceProvider that never get called for the “output” content type.

[Export(typeof(IViewTaggerProvider))]
[ContentType("output")]
[TagType(typeof(ClassificationTag))]
internal class ColorTaggerProvider : IViewTaggerProvider
{
    [Import]
    internal IClassificationTypeRegistryService _classificationTypeRegistry = null;
    [Import]
    internal IClassificationFormatMapService _formatMapService = null;

    public ITagger<T> CreateTagger<T>(ITextView view, ITextBuffer buffer) where T : ITag
    {
        return new OutputWindowColorTagger(view, buffer, _classificationTypeRegistry, _formatMapService) as ITagger<T>;
    }
}

If it’s not a bug and the “output” window doesn’t work with ILineTransformSourceProvider how else, I could modify the height of the text lines send there?

I’m testing this Visual Studio extension on VS22 17.14.0 Preview 2.0 (latest version as today)

Answer 1

using System;
using System.Collections.Generic;
using System.Linq;
using System.ComponentModel.Composition;
using Microsoft.VisualStudio.Text.Editor;
using Microsoft.VisualStudio.Utilities;
using Microsoft.VisualStudio.Text.Formatting;

[Export(typeof(ILineTransformSourceProvider))]
[TextViewRole(PredefinedTextViewRoles.Interactive)] // <----- This attribute is required
[ContentType("Output")]
//[ContentType("BuildOutput")]
//[ContentType("BuildOrderOutput")]
//[ContentType("DebugOutput")]
//[ContentType("TestsOutput")]
internal class OutputTransformSourceProvider : ILineTransformSourceProvider, ILineTransformSource
{
    public ILineTransformSource Create(IWpfTextView textView)
    {
        System.Diagnostics.Debug.WriteLine(textView.TextDataModel.ContentType.TypeName);
        return this;
    }


    public LineTransform GetLineTransform(ITextViewLine line, double yPosition, ViewRelativePosition placement)
    {
        return new LineTransform(10, 10, 1);
    }
}

Answer 2

im not really sure of how to do it but try this

: class Myclass { public: Myclass(); void helloworld(); };