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Issue #2837 - Implement prefers-reduced-motion media query.

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Resolves #2837
This commit is contained in:
Moonchild 2025-08-08 10:59:59 +02:00 • committed by roytam1
commit df3b213459
5 changed files with 47 additions and 6 deletions
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36
layout/style/nsMediaFeatures.cpp
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@ -47,9 +47,15 @@ static const nsCSSProps::KTableEntry kDisplayModeKeywords[] = {
};
static const nsCSSProps::KTableEntry kPrefersColorSchemeKeywords[] = {
{ eCSSKeyword_light, NS_STYLE_PREFERS_COLOR_SCHEME_LIGHT },
{ eCSSKeyword_dark, NS_STYLE_PREFERS_COLOR_SCHEME_DARK },
{ eCSSKeyword_UNKNOWN, -1 },
{ eCSSKeyword_light, NS_STYLE_PREFERS_COLOR_SCHEME_LIGHT },
{ eCSSKeyword_dark, NS_STYLE_PREFERS_COLOR_SCHEME_DARK },
{ eCSSKeyword_UNKNOWN, -1 },
};
static const nsCSSProps::KTableEntry kPrefersMotionKeywords[] = {
{ eCSSKeyword_no_preference, NS_STYLE_PREFERS_FULL_MOTION },
{ eCSSKeyword_reduce, NS_STYLE_PREFERS_REDUCED_MOTION },
{ eCSSKeyword_UNKNOWN, -1 },
};
#ifdef XP_WIN
@ -497,6 +503,22 @@ GetPrefersColorScheme(nsPresContext* aPresContext, const nsMediaFeature* aFeatur
return NS_OK;
}
static nsresult
GetPrefersMotion(nsPresContext* aPresContext, const nsMediaFeature* aFeature,
nsCSSValue& aResult)
{
switch(Preferences::GetInt("ui.prefersReducedMotion", 0)) {
case 1:
aResult.SetIntValue(NS_STYLE_PREFERS_REDUCED_MOTION,
eCSSUnit_Enumerated);
break;
default:
aResult.Reset();
}
return NS_OK;
}
static nsresult
GetDarkTheme(nsPresContext* aPresContext, const nsMediaFeature* aFeature,
nsCSSValue& aResult)
@ -630,6 +652,14 @@ nsMediaFeatures::features[] = {
{ kPrefersColorSchemeKeywords },
GetPrefersColorScheme
},
{
&nsGkAtoms::prefers_reduced_motion,
nsMediaFeature::eMinMaxNotAllowed,
nsMediaFeature::eEnumerated,
nsMediaFeature::eNoRequirements,
{ kPrefersMotionKeywords },
GetPrefersMotion
},
{
&nsGkAtoms::resolution,
nsMediaFeature::eMinMaxAllowed,