wrolpi/app/src
Roland 9f3800b403
ui: tags look like tags, and stay readable in every theme
Four things, three cosmetic and one a real legibility bug.

* Tags were square chips.  They now have a pointed left edge and an
  eyelet, like a tag tied to a garment -- the shape Semantic gave them,
  and the reason a tag reads as a tag rather than as a small button.  The
  point is a square rotated behind the left edge, sized so its diagonal
  equals the body height and its two edges meet the body at the corners.

  Only where something is actually a tag.  `Label` carries the count
  badges in the Tags table too -- file, zim, channel and domain counts --
  and a point on a number reads as an arrow, so the shape is behind a
  `tag` prop and `NameToTagLabel` opts in.

* They were smaller than what they replaced: 11.5px text with 3px of
  padding, against Semantic's 12px and ~7px.  Now 12.5px and 5px, which
  also keeps them a reasonable thing to tap.

* Wrapped rows of tags sat on the row above, so they carry a bottom
  margin, plus a left margin for the point to occupy.

* The text colour was unreadable in night and wrong in amber.

Tags.js calculates black-or-light against the colour the user chose for
each tag, and wrote the answer to `color` inline -- a declaration no
stylesheet rule can outrank.  Night turns a tag into an outline over a
near-black page, so a near-white tag kept the black text calculated for
its fill and was left legible only by its border: 1.1:1, measured.  Amber
replaces every fill with its own bright orange and was painting `#dddddd`
on `#ff9500`, about 1.9:1, and a neutral grey in a theme whose whole
point is that no other hue reaches the eye.

The fix is to stop hard-coding `color` so the theme can decide: the
calculated colour goes into `--label-text`, and night and amber override
it alongside the fill they already override.  There is no second contrast
function to write, which is what this looked like it needed -- once a
theme has discarded the user's colour there is nothing left to calculate
against, and the answer is just the theme's own token.

`.wrolpi-label-white` and `-black` moved to the same variable.  Setting
`color` there outranked the base rule, so amber was painting `--white` on
`--text`: light orange on orange.

`contrastingColor` was also picking the worse of its two options.  It
compared a brightness figure against a threshold, and the figure weighted
the gamma-encoded bytes without linearising them, so Semantic's blue
`#2185d0` got light text at 2.9:1 where dark text gives 5.3:1.  Every
mid-tone blue, teal and purple a user might pick sat in that band.  It
now measures the WCAG contrast ratio of both candidates and returns the
better one, which needs no threshold at all.

Tests
-----
`Tags.test.js` is new, and covers the chip nothing covered: every other
spec takes `NameToTagLabel` from `tagsContextFixture`, which stubs it as
a function returning the name.  That is how a tag could be unreadable
without a single test noticing.  Two of these were verified red against
the inline `color`.

`cy.contrastRatio()` measures text against the surface *actually* behind
it, walking up to the first ancestor that paints something -- a
transparent tag has no background of its own, so a naive check reads
rgba(0,0,0,0) and concludes anything is legible.  Twelve cases, three
tag colours across four themes, at WCAG AA.  Plus a test asserting the
old inline-`color` version still measures below 1.5:1, so the check is
provably able to fail.

The gallery had label swatches in theme colours and no user-coloured tag,
which is why none of this was visible in it.  It has eleven now, spanning
the range where the black-or-light decision flips.
2026-08-05 18:37:13 -06:00
..
api controller: VNC toggle, gated on the Desktop running 2026-07-29 18:10:05 -06:00
components ui: tags look like tags, and stay readable in every theme 2026-08-05 18:37:13 -06:00
contexts test: one place for fixtures, real providers instead of mocked context modules 2026-08-05 18:36:48 -06:00
hooks build: uninstall Semantic UI 2026-08-05 18:36:31 -06:00
themes ui: a browser layer for the library, and the .media reset that never applied 2026-08-05 18:36:34 -06:00
types ui: the last Semantic UI file, and the stylesheet with it 2026-08-05 18:36:26 -06:00
api.js ui: thirty-five files off Semantic, leaving fifteen 2026-08-05 18:34:58 -06:00
App.css test: one place for fixtures, real providers instead of mocked context modules 2026-08-05 18:36:48 -06:00
App.js ui: the last Semantic UI file, and the stylesheet with it 2026-08-05 18:36:26 -06:00
DashboardPage.js ui: thirty-five files off Semantic, leaving fifteen 2026-08-05 18:34:58 -06:00
DashboardPage.test.js ui: thirty-five files off Semantic, leaving fifteen 2026-08-05 18:34:58 -06:00
Events.js ui: thirty-five files off Semantic, leaving fifteen 2026-08-05 18:34:58 -06:00
index.css ui: the last Semantic UI file, and the stylesheet with it 2026-08-05 18:36:26 -06:00
index.js Fixing changes before merge. 2023-02-08 21:18:51 -07:00
logo.svg Renaming examples to avoid grouping of pdf with ebooks. Reworking URLs for media files to avoid escaping url safe characters. 2023-03-29 13:46:39 -06:00
reportWebVitals.js Renaming examples to avoid grouping of pdf with ebooks. Reworking URLs for media files to avoid escaping url safe characters. 2023-03-29 13:46:39 -06:00
semantic-baseline.json ui: the last Semantic UI file, and the stylesheet with it 2026-08-05 18:36:26 -06:00
semantic-baseline.test.js build: uninstall Semantic UI 2026-08-05 18:36:31 -06:00
setupTests.js ui: Common.js and thirteen more files off Semantic 2026-08-05 18:34:50 -06:00
Tags.cy.js Video downloads have many more options. Downloads are migrated. 2024-11-28 09:48:57 -07:00
Tags.js ui: tags look like tags, and stay readable in every theme 2026-08-05 18:37:13 -06:00
Tags.test.js ui: tags look like tags, and stay readable in every theme 2026-08-05 18:37:13 -06:00
test-fixtures.js test: check declared types, not just field names, and fix the three that were wrong 2026-08-05 18:37:01 -06:00
test-fixtures.test.js test: one place for fixtures, real providers instead of mocked context modules 2026-08-05 18:36:48 -06:00
test-utils.js test: the theme drives the colour scheme, and mockModule takes the module 2026-08-05 18:36:53 -06:00
test-utils.test.js test: the theme drives the colour scheme, and mockModule takes the module 2026-08-05 18:36:53 -06:00