style

The type scale of Vibrant Gio, a design system for native desktop applications on macOS, Windows and Linux, written in pure Go on Gio — fourteen named text styles and the font collection they are drawn with, in one file of about forty lines.

An application drawing its own text has two problems that have nothing to do with each other and always arrive together: which faces does my shaper load, and how big is a heading. style answers both in one import. FontFaces() returns the Roboto faces to build a *text.Shaper from, and H1 … Overline are ready-made textdraw.TextStyle values — a font, a size, an alignment, a line limit and a truncator — to hand to textdraw's drawing calls. That is why the example programs in the organization that still draw text this way import exactly these two modules together — the workbench applications used to as well, until F1 moved them onto the theme's typography.

This module is frozen. It is the Material Design 2 scale, and Vibrant Gio targets MD3; more importantly the scale is a package-level table rather than a theme value, so it cannot vary with the theme, the platform or the user's preferences. ADR-003 supersedes it with the spectrum/tokens Typography theme token, and every symbol here carries a Deprecated: marker naming its MD3 replacement. The module was kept for the deprecation window so existing imports kept compiling; nothing here will be extended, and only correctness fixes land — see Status before building on it.

The window is closed. F3.4 of the org plan landed on 2026-08-06 and ended it. G-F1 had already moved the last in-org consumers off this module, so there was nothing left to sweep: the deprecation shims other repositories carried were deleted in their own major releases, and style, which is nothing but deprecated surface, is instead archived at v0.0.6. It is frozen there and will never be re-tagged. The freeze ends by archival, not deletion — the v0.0.6 tag and the import path keep resolving forever; the repository just stops changing. There will be no v0.0.7.

Where it sits

Tier 0 of the stack — mvu → spectrum → prism → pulse → cadence → markdown — and the one intra-tier edge ADR-001's table has to admit by name: style imports font and textdraw, both also tier 0. The layering check permits that single edge rather than renumbering the tier. The organization page has the full tier table.

Nothing inside the design system imports style — not prism, not cadence, not markdown. Its consumers were all applications, and most of them are gone: F1 migrated every workbench application and every mvu/example program off it. What remains is eleven example mains in the support repositories — four under ivg/raster/gio/example, three under svg/driver/gio/example and the four traer/gio demos. F3.4 archived the repository with those still pointing at v0.0.6, which keeps resolving after archival — which is the whole point of archiving rather than deleting.

go get github.com/vibrantgio/style

Every module in the organization is on gioui.org v0.10.1 and Go 1.25.1.

Packages

One package, at the module root.

Symbol
FontFaces()	The five upright Roboto weights the scale names — Thin, Light, Normal, Medium, Bold — as []textdraw.FontFace, which is a type alias for gioui.org/font.FontFace, so it drops straight into text.WithCollection.
H1 … H6	Headings, 96/60/48/34/24/20 sp, single-line, ellipsis-truncated. H1 is Thin, H2 is Light, the rest are Normal.
Subtitle1, Subtitle2	16 sp Normal and 14 sp Medium, single-line.
BodyText1, BodyText2	16 sp and 14 sp Normal, and the only two styles with MaxLines: 0 — the only two that wrap.
Button, SmallButton	14 sp Medium and 12 sp Bold, single-line.
Caption, Overline	12 sp and 10 sp Normal, single-line.

Every style is Alignment: textdraw.Start and Truncator: "…". Size is unit.Sp, not unit.Dp — it scales with the user's text-size preference, and the twelve heading and label styles cap at one line.

Usage

Nothing new should be written against this module — a Vibrant Gio application takes its typography from the theme (Typography.Shaper() and the MD3 roles; see the spectrum README). This section documents the pattern the remaining consumers use.

Build the shaper once per window, at layer-building scope, and hand it to everything that draws. It is the same line, character for character, in all eleven programs that call FontFaces():

shaper := text.NewShaper(text.WithCollection(style.FontFaces()))

Note what is not passed: text.NoSystemFonts(). Leaving system fonts loaded keeps a fallback for glyphs Roboto lacks and for named families such as the generic monospace that markdown's code spans resolve through. And do not append gofont to the collection — that loads two type systems into one window, and the mixing shows up only on the glyphs that fall through.

The styles are ready-made textdraw.TextStyle values, and drawing through textdraw is the pairing this module exists for — the style carries the font and size, MeasureText gives the line height, FillText/Text put glyphs on screen. From traer/gio/gravity:

layout.UniformInset(12).Layout(gtx, textdraw.Text(shaper, style.H3, 0.0, 0.0, Grey900, "Gravity Well"))
layout.UniformInset(12).Layout(gtx, textdraw.Text(shaper, style.H4, 1.0, 1.0, Grey900, fmt.Sprint(fps, "fps")))

For coding assistants

Read the canonical guide before writing code against this module — the module inventory with current tags, the application skeleton, MVU and rx semantics, typography, and the pitfalls that are not guessable:

https://raw.githubusercontent.com/vibrantgio/.github/master/llms.txt

AGENTS.md in this repository has the build and test commands.

Status

Honest about what does not work yet. Every number below is measured against the source, not estimated. None of it will be fixed: v0.0.6 is the last tag.

• This module is archived at v0.0.6 and frozen there. ADR-003 opened a deprecation window on it; F3.4 closed the window by archiving the repository rather than sweeping it, because by then G-F1 had moved the last in-org consumer off it and there was nothing left to remove that removing the whole module did not already cover. Every item below is therefore permanent, not pending.
• This module was never wired into the component stack, and now never will be. No library source file in prism, pulse, cadence, markdown or spectrum imports style; the components style their text from the spectrum/tokens.Typography theme token Phase C shipped — typeface, weight, size, line height and tracking per MD3 role, plus the one shared shaper — and C1.4 marked every symbol here Deprecated: with that replacement. An application that styles its own text with H5 and drops a cadence heading beside it is mixing two type systems; F1 removed the last such mixture from the workbench applications.
• H2 was 96 sp until C1.4 — the same as H1. MD2's H2 is 60, and the two differed only in weight — Thin and Light — so a document using both got no size hierarchy at all. It is 60 now, which means a program pinned to a version before the fix draws H2 at 96, not the 60 this README documents.
• The scale cannot vary. These are package-level vars, so there is one scale per binary: no theme, no density, no platform and no accessibility preference can change a size. spectrum/a11y publishes the OS text-scaling and reduce-motion preferences and nothing here reads them.
• FontFaces() returns five of the twelve faces font ships. Thin, Light, Normal, Medium and Bold — no Black, and no italic at any weight. A shaper built from this collection alone cannot render italic Roboto; it falls through to a system face, or to nothing under text.NoSystemFonts(). There is no FontFacesWithItalic, and no way to extend the collection except building the slice yourself.
• Eleven of the fourteen styles have no consumer anywhere in the organization. After the F1 migration only H3 (4 call sites), H4 (4) and H5 (7) are still drawn with, all in the support repositories' example programs; FontFaces keeps its 11 call sites in the same programs. Everything else — every subtitle, body, button, caption and overline style — is imported by nothing.
• SmallButton is not an MD2 role. The MD2 scale has thirteen styles; this is a fourteenth, 12 sp Bold, invented here. It has no counterpart in the MD3 Typography token either, so there is nothing to migrate it to.
• Only BodyText1 and BodyText2 wrap. Every other style sets MaxLines: 1, so a heading longer than its box is silently truncated with an ellipsis rather than flowing. That is usually what a heading wants and never what a paragraph does; if you are drawing a paragraph with anything but the two body styles, copy the value and clear MaxLines.
• There are no tests. go test ./... reports "no test files".

License

MIT — see LICENSE.