feat: add ConnectedButtonGroup component#5028
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…group Introduces ConnectedButtonGroup, the MD3 successor to SegmentedButtons. Selected buttons morph to a fully-rounded shape, the connected inner corners expand on press, and the group supports single- and multi-select across the extra-small to extra-large size scale. Component-specific tokens are extracted into tokens.ts; size, shape and color resolution live in utils.ts. SegmentedButtons is marked as deprecated in favour of the new component.
…ty overlay Pre-blending the disabled container color with color().alpha() breaks on Android dynamic themes where onSurface is a PlatformColor object rather than a string — the fallback rendered a fully opaque near-black container. Apply the MD3 12% disabled opacity as a style on an absolute-fill overlay instead, which works with any ColorValue. Found during on-device Android verification.
- tokens: pressed inner corner now morphs sharper than rest (M3 ConnectedButtonGroup*Tokens: Inner=Small, PressedInner=ExtraSmall), and large/extra-large rest inner corners corrected to large(16)/largeIncreased(20). - press morph: selected buttons also morph on press (pressed precedence over checked, matching Compose ToggleButton); pressOut returns to the rest radius. - accessibility: buttons now use the radio (single-select) / checkbox (multi-select) role instead of button+aria-checked, valid on web and better announced natively. - reduce-motion: shape morph honours the reduce-motion setting (ReduceMotion), matching Switch/FAB. - docs: register ConnectedButtonGroup in component-docs.config so the deprecation link and generated page resolve. - tests: cover shape tokens and role semantics (22 total).
- resolve corner shapes through the shared ShapeToken/resolveCornerRadius from theme/utils/shape instead of a local re-implementation. - drop the per-button rippleColor prop and runtime ripple color derivation; TouchableRipple's stateLayerPressed default applies, consistent with the removal of customRippleColor across components. - expose background and hitSlop passthroughs per button, mirroring SegmentedButtons, and remove the ineffective automatic touch-target expansion. - drive the corner morph with the theme's fast spatial spring (toRawSpring), matching Switch and FAB, instead of timing curves. - add radiogroup semantics to the single-select row and collision-proof list keys. - honour intrinsic button widths in content-sized parents (flexBasis auto). - export ConnectedButtonGroupSize, register a docs screenshot, keep the docs config alphabetical, and extend tests with render snapshots (23).
The docs build requires a committed page under 5.x/docs/components for every entry in component-docs.config; add the ConnectedButtonGroup page (usage, props, theme colors) mirroring SegmentedButtons, regenerate the 6.x content, and point the SegmentedButtons deprecation notice at the correct relative path so the link resolves.
matkoson
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July 16, 2026 10:40
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Motivation
The Material Design 3 spec deprecates segmented buttons in favor of the connected button group. This PR adds a
ConnectedButtonGroupcomponent implementing that spec as part of the ongoing modernization effort:buttons/value/onValueChangeAPI shape asSegmentedButtons, easing migration).extra-small→extra-large: 32/40/56/96/136dp) with per-size component tokens extracted intotokens.ts.secondaryContainer/onSecondaryContainer, unselectedsurfaceContainer/onSurfaceVariant, disabledonSurfaceat 12% container / 38% content opacity (applied as styles soPlatformColorthemes work).radio(single-select, inside aradiogrouprow) orcheckbox(multi-select) role with checked/disabled state; per-buttonaria-label, optional selected check icon,hitSlop/backgroundpassthroughs.resolveCornerRadius/ShapeToken,toRawSpring,TouchableRipple'sstateLayerPressedripple default).SegmentedButtonsis marked@deprecatedpointing to this component (non-breaking).Related issue
Fixes #4979
Test plan
yarn typecheck,yarn lint— clean.yarn test ConnectedButtonGroup— 23 tests + 4 render snapshots covering selection (single/multi), sizing, MD3 color roles, disabled behavior, selection check, custom colors, accessibility roles, and shape tokens.