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fix(CSS): handle PlatformColor and DynamicColorIOS values - #10282
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📝 Walkthrough
Priority: ➖ Normal Change: Bug fix Merge Risk: 🔵 Low · up to
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| Check name | Status | Explanation |
|---|---|---|
| Title check |  |
The title clearly summarizes the main change: support for PlatformColor and DynamicColorIOS values in CSS. |
| Description check | |
The description directly explains the new CSSPlatformColor support, interpolation behavior, shared-code changes, and testing results. |
| Linked Issues check | |
Check skipped because no linked issues were found for this pull request. |
| Out of Scope Changes check | |
Check skipped because no linked issues were found for this pull request. |
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Actionable comments posted: 2
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Inline comments:
In
`@packages/react-native-reanimated/Common/cpp/reanimated/CSS/common/values/CSSValueVariant.cpp`:
- Line 143: Update CSSValueVariant::interpolate to detect CSSPlatformColor at
either endpoint before variant-index fallback interpolation, and throw the
existing descriptive unsupported-animation error for mixed
CSSPlatformColor/CSSColor transitions; preserve normal interpolation for
matching alternatives.
In
`@packages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platformColor.cpp`:
- Around line 42-47: Update the nested dynamic-value validation after retrieving
dynamicColor so function values are rejected before acceptance: require
dynamicColor to be an object, not a function, and not an array. Preserve the
existing semantic and resource_paths checks.
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📒 Files selected for processing (8)
packages/react-native-reanimated/Common/cpp/reanimated/CSS/InterpolatorRegistry.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/common/values/CSSPlatformColor.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/common/values/CSSPlatformColor.hpackages/react-native-reanimated/Common/cpp/reanimated/CSS/common/values/CSSValueVariant.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/interpolation/InterpolatorFactory.hpackages/react-native-reanimated/Common/cpp/reanimated/CSS/interpolation/values/SimpleValueInterpolator.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platformColor.cpppackages/react-native-reanimated/Common/cpp/reanimated/CSS/utils/platformColor.h
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MatiPl01
changed the title
PlatformColor and DynamicColorIOS payloads reached CSSColor, which accepts only numbers and bools, so the variant found no matching type and threw. They now parse into CSSPlatformColor, which keeps the payload and hands it back to RN from toDynamic() - static platform colors render as before. Interpolating one still throws, with a message saying so; resolving a payload against the animated view comes next.
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Two more points that I cannot attach to diff lines:
boxShadowcolor:CSSBoxShadowbuilds its color withCSSColor(rt, obj.getProperty(rt, "color"))(CSSBoxShadow.cpp:50). This constructor makesTransparentfrom any object. ThusboxShadow: [{ ..., color: PlatformColor('label') }]does not crash, but the shadow is invisible. The same static style shows correctly.- Tests: this PR fixes a crash, but it adds no ReJest test in
runtime-tests/reanimated/tests/css/. #10305 adds only an example screen, so the crash can come back without a CI failure. Should we add a test for keyframes and a transition withPlatformColorandDynamicColorIOS?
3 participants
First PR of a series adding
PlatformColorsupport to CSS animations. It puts the skeleton in place - the value type and the shared-code changes the layer needs to carry one - without resolving anything yet. Resolution and blending follow in #10305.PlatformColorandDynamicColorIOSpayloads are objects, butCSSColoraccepts only numbers and bools, so a color property carrying one killed the app withNo compatible type found for construction.They now parse into
CSSPlatformColor, which keeps the payload and hands it back fromtoDynamic()for React Native to resolve against the surface's theme, exactly as for a static style. Color properties accept either alternative,value<CSSColor, CSSPlatformColor>.Turning a payload into channels needs the animated view, which is not implemented here, so a platform color reports that it cannot interpolate and the variant switches over instead. Nothing throws.
Shared code moves to make room for it.
CSSPlatformColoris the first value type that resolves without being relative to a view property, a distinction the twovalue()overloads did not draw before, soResolvableValueInterpolator, its config and its factory becomeRelative*to match what they actually carry, and the overload guards now separate "resolves against a relative property" from "resolves at all".Testing
iOS and Android build, jest and static checks pass. On the simulator: plain color ramps unchanged, static
PlatformColorrenders, and both platform-to-platform and platform-to-plain switch over with the app alive.