Changing default settings

The visual studio editor has a bunch of build in settings you can turn on and off per editor.

Since I’m writing a language service for Haskell, I would like to enable replacing tabs with spaces, set the amount of spaces to 4 and turn on line numbering

After a bit of searching I found a blog post from Noah Ric a developer at Microsoft about disabling zooming in a document window.

So using this as a basis I created the following:

internal class ViewCreationListener : IWpfTextViewCreationListener
    public void TextViewCreated(IWpfTextView textView)
        textView.Options.SetOptionValue(DefaultWpfViewOptions.EnableHighlightCurrentLineId, false);
        textView.Options.SetOptionValue(DefaultOptions.TabSizeOptionId, 4);
        textView.Options.SetOptionValue(DefaultOptions.ConvertTabsToSpacesOptionId, true);
        textView.Options.SetOptionValue(DefaultTextViewHostOptions.LineNumberMarginId, true);


(sorry no syntax highlighting as I can’t find a theme on here that won’t break it)

Notice the “PredefinedTextViewRoles.Zoomable” , I wanted to use PredefinedTextViewRoles.Document but when doing this the IDE would randomly throw Exceptions saying that the Editor wasn’t fully created yet. Which is odd since Visual Studio is doing all the initializations.

The set of values you can change this way are listed here:

For more things you change take a look at