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DEV: Backend support for light/dark mode in color palettes (#30893)

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We're embarking on a project for overhauling the color palette and theme
systems in Discourse. As part of this project, we're making each color
palette include light and dark modes instead of the status quo of
requiring 2 separate color palettes to implement light and dark modes.

This commit is a first step towards that goal; it adds a code path for
generating and serving `color_definitions` stylesheets using the
built-in dark variant of a color palette. All of this code path is
behind a default-off site setting `use_overhauled_theme_color_palette`,
so there's no change in behavior unless the setting is enabled.

Internal topic: t/141467.
This commit is contained in:
Osama Sayegh
2025-01-23 15:54:49 +03:00
committed by GitHub
parent 13f86c99ea
commit 10f34ddf86
10 changed files with 193 additions and 41 deletions
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12
app/helpers/application_helper.rb
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@ -555,8 +555,12 @@ module ApplicationHelper
end
def dark_scheme_id
cookies[:dark_scheme_id] || current_user&.user_option&.dark_scheme_id ||
SiteSetting.default_dark_mode_color_scheme_id
if SiteSetting.use_overhauled_theme_color_palette
scheme_id
else
cookies[:dark_scheme_id] || current_user&.user_option&.dark_scheme_id ||
SiteSetting.default_dark_mode_color_scheme_id
end
end
def current_homepage
@ -638,6 +642,7 @@ module ApplicationHelper
result << stylesheet_manager.color_scheme_stylesheet_preload_tag(
dark_scheme_id,
"(prefers-color-scheme: dark)",
dark: SiteSetting.use_overhauled_theme_color_palette,
)
end
@ -657,6 +662,7 @@ module ApplicationHelper
dark_scheme_id,
"(prefers-color-scheme: dark)",
self.method(:add_resource_preload_list),
dark: SiteSetting.use_overhauled_theme_color_palette,
)
end
@ -668,7 +674,7 @@ module ApplicationHelper
if dark_scheme_id != -1
result << <<~HTML
<meta name="theme-color" media="(prefers-color-scheme: light)" content="##{ColorScheme.hex_for_name("header_background", scheme_id)}">
<meta name="theme-color" media="(prefers-color-scheme: dark)" content="##{ColorScheme.hex_for_name("header_background", dark_scheme_id)}">
<meta name="theme-color" media="(prefers-color-scheme: dark)" content="##{ColorScheme.hex_for_name("header_background", dark_scheme_id, dark: SiteSetting.use_overhauled_theme_color_palette)}">
HTML
else
result << <<~HTML