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Use Tailwind dark: toggles for dark-mode icons

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The previous <picture media="(prefers-color-scheme: dark)"> only fires
when the OS is in dark mode. Clinch toggles dark mode with a class on
<html> via dark_mode_controller and Tailwind's @custom-variant dark
(&:where(.dark, .dark *)), so the picture source never swapped when
users clicked the in-app theme toggle. Render both <img> tags and
use Tailwind's dark:hidden / hidden dark:block so the swap follows
whatever strategy Tailwind is configured for.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Dan Milne
2026-06-07 17:19:36 +10:00
parent c5ab7dc2a5
commit fe68f6e81e
3 changed files with 34 additions and 11 deletions
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24
app/helpers/application_helper.rb
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@@ -70,19 +70,23 @@ module ApplicationHelper
MONOGRAM_PALETTE[index]
end
# Renders an application icon as a <picture> that swaps based on the user's
# color-scheme preference. If only `icon` is attached, the same image is used
# in both modes. Caller is responsible for ensuring at least app.icon is
# attached; the monogram fallback handles the no-icon case separately.
# Renders an application icon with optional dark-mode variant. If
# `icon_dark` is attached, we render both <img> tags and Tailwind's class-
# based `dark:` modifier hides the inactive one — so it follows the in-app
# theme toggle (.dark on <html>), not the OS preference. If only `icon` is
# attached, the same image is used in both modes. Caller must ensure at
# least app.icon is attached; the monogram fallback handles no-icon.
def app_icon_picture(app, class:, alt: nil)
img_class = binding.local_variable_get(:class)
alt ||= "#{app.name} icon"
light = url_for(app.icon)
dark = app.icon_dark.attached? ? url_for(app.icon_dark) : nil
tag.picture do
sources = []
sources << tag.source(media: "(prefers-color-scheme: dark)", srcset: dark) if dark
safe_join(sources + [image_tag(app.icon, class: img_class, alt: alt)])
if app.icon_dark.attached?
safe_join([
image_tag(app.icon, class: "#{img_class} dark:hidden", alt: alt),
image_tag(app.icon_dark, class: "#{img_class} hidden dark:block", alt: alt)
])
else
image_tag(app.icon, class: img_class, alt: alt)
end
end
end