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

Question

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

Lilo 20

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: devenv_o0sO1MgQZA “Output Window” I’m referring to this window where you can output debug data devenv_rDMUdBZsYn 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)

Morgan 0 Reputation points

2025-04-19T08:22:10.4+00:00

try going here https://images.app.goo.gl/5FEhaCX44Pn1KS7a9

Accepted answer

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Your answer

Morgan 0 Reputation points

2025-04-19T08:22:10.4+00:00

try going here https://images.app.goo.gl/5FEhaCX44Pn1KS7a9

Answer 1

gekka 11,776 MVP

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);
    }
}

Lilo 20 Reputation points

2025-04-16T18:47:54.2266667+00:00

Thank you, where did you read that this attribute was necessary?
gekka 11,776 Reputation points MVP

2025-04-16T23:40:04.0266667+00:00

Language service and editor extension points

TextViewRoleAttribute: the kind of text view for which this adornment is valid. The class PredefinedTextViewRoles has the set of predefined text view roles. For example, Document is primarily used for text views of files. Interactive is used for text views that a user can edit or navigate by using a mouse and keyboard. Examples of Interactive views are the editor text view and the Output window.
Lilo 20 Reputation points

2025-04-19T01:31:05.52+00:00

I was trying to create some kind of toggle to hide/unhide some lines when a hotkey is pressed I have set the font size to 0.1 and line height 0.1 but when there's too many lines to "hide" they still occupy much space.

@gekka do you know if there's an API to effectively hide a line?

Answer 2

Morgan 0

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

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

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

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