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style: Choose tabpanel background based on content preferred color-scheme

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If the theme is dark but user prefers light pages, the background of the
tabpanel should arguably be light, since it can be seen across some
navigations.

Expose a -moz-content-prefers-color-scheme media query to chrome pages
so that our UI can correctly query it (and remove the unused -moz-proton
atom while at it).

Differential Revision: https://phabricator.services.mozilla.com/D136437
This commit is contained in:
Emilio Cobos Álvarez 2023-06-06 23:37:35 +02:00 • committed by Oriol Brufau
parent df6b6ba675
commit 0307500c3d
1 changed files with 28 additions and 4 deletions
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32
components/style/gecko/media_features.rs
View file

@ -396,16 +396,31 @@ fn eval_overflow_inline(device: &Device, query_value: Option<OverflowInline>) ->
}
}
/// https://drafts.csswg.org/mediaqueries-5/#prefers-color-scheme
fn eval_prefers_color_scheme(device: &Device, query_value: Option<PrefersColorScheme>) -> bool {
fn do_eval_prefers_color_scheme(
device: &Device,
use_content: bool,
query_value: Option<PrefersColorScheme>,
) -> bool {
let prefers_color_scheme =
unsafe { bindings::Gecko_MediaFeatures_PrefersColorScheme(device.document()) };
unsafe { bindings::Gecko_MediaFeatures_PrefersColorScheme(device.document(), use_content) };
match query_value {
Some(v) => prefers_color_scheme == v,
None => true,
}
}
/// https://drafts.csswg.org/mediaqueries-5/#prefers-color-scheme
fn eval_prefers_color_scheme(device: &Device, query_value: Option<PrefersColorScheme>) -> bool {
do_eval_prefers_color_scheme(device, /* use_content = */ false, query_value)
}
fn eval_content_prefers_color_scheme(
device: &Device,
query_value: Option<PrefersColorScheme>,
) -> bool {
do_eval_prefers_color_scheme(device, /* use_content = */ true, query_value)
}
bitflags! {
/// https://drafts.csswg.org/mediaqueries-4/#mf-interaction
struct PointerCapabilities: u8 {
@ -652,7 +667,7 @@ macro_rules! bool_pref_feature {
/// to support new types in these entries and (2) ensuring that either
/// nsPresContext::MediaFeatureValuesChanged is called when the value that
/// would be returned by the evaluator function could change.
pub static MEDIA_FEATURES: [MediaFeatureDescription; 57] = [
pub static MEDIA_FEATURES: [MediaFeatureDescription; 58] = [
feature!(
atom!("width"),
AllowsRanges::Yes,
@ -805,6 +820,15 @@ pub static MEDIA_FEATURES: [MediaFeatureDescription; 57] = [
keyword_evaluator!(eval_prefers_color_scheme, PrefersColorScheme),
ParsingRequirements::empty(),
),
// Evaluates to the preferred color scheme for content. Only useful in
// chrome context, where the chrome color-scheme and the content
// color-scheme might differ.
feature!(
atom!("-moz-content-prefers-color-scheme"),
AllowsRanges::No,
keyword_evaluator!(eval_content_prefers_color_scheme, PrefersColorScheme),
ParsingRequirements::CHROME_AND_UA_ONLY,
),
feature!(
atom!("pointer"),
AllowsRanges::No,