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Animate SegmentedControl when switching between items #8304

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Animate SegmentedControl when switching between items #8304

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945fa9b
Animate SegmentedControl when switching between items
iansan5653 Aug 13, 2026
57ffdad
Add changeset for SegmentedControl animation
iansan5653 Aug 13, 2026
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5 changes: 5 additions & 0 deletions .changeset/three-places-invent.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@primer/react": patch
---

Animate `SegmentedControl` when switching between items
34 changes: 29 additions & 5 deletions packages/react/src/SegmentedControl/SegmentedControl.module.css
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
.SegmentedControl {
/* TODO: use primitive `control.medium.size` when it is available instead of '32px' */
--segmented-control-icon-width: 32px;
--segmented-control-outer-radius: var(--borderRadius-medium);

display: inline-flex;

Expand All @@ -12,6 +13,24 @@
background-color: var(--controlTrack-bgColor-rest);
border: var(--borderWidth-thin) solid var(--controlTrack-borderColor-rest, transparent);
border-radius: var(--borderRadius-medium);
position: relative;

@supports (anchor-name: --value) {
&::before {
position-anchor: --segmented-control-current-item;
content: '';
position: absolute;
inset: anchor(top) anchor(right) anchor(bottom) anchor(left);
background-color: var(--controlKnob-bgColor-rest);
border: var(--borderWidth-thin) solid var(--controlKnob-borderColor-rest);
/* stylelint-disable-next-line primer/borders */
border-radius: var(--segmented-control-outer-radius);

@media (prefers-reduced-motion: no-preference) {
transition: inset var(--base-duration-200) var(--base-easing-easeInOut);
}
}
}

/* Responsive full-width */
&[data-full-width='true'] {
Expand Down Expand Up @@ -209,7 +228,6 @@
/* TODO: use primitive `primer.control.medium.paddingInline.normal` when it is available */
--segmented-control-button-inner-padding: 12px;
--segmented-control-button-bg-inset: 4px;
--segmented-control-outer-radius: var(--borderRadius-medium);

width: 100%;
height: 100%;
Expand Down Expand Up @@ -294,6 +312,8 @@
border-color: transparent;
border-style: solid;
border-width: var(--borderWidth-thin);
background-color: transparent;
transition: background-color var(--base-duration-200) var(--base-easing-easeInOut);

@iansan5653 iansan5653 Aug 13, 2026

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This ease on the background color helps avoid a slightly glitchy looking appearance when the hover background color appears over the sliding background if you move the mouse fast enough.

@iansan5653 iansan5653 Aug 13, 2026

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Meh, I don't think it's an issue to transition a background color. That's not "motion" like the actual motion is.


/*
innerRadius = outerRadius - distance/2
Expand All @@ -314,10 +334,14 @@
padding-right: var(--segmented-control-button-inner-padding);
/* stylelint-disable-next-line primer/spacing */
padding-left: var(--segmented-control-button-inner-padding);
background-color: var(--controlKnob-bgColor-rest);
border-color: var(--controlKnob-borderColor-rest);
/* stylelint-disable-next-line primer/borders */
border-radius: var(--segmented-control-outer-radius);
anchor-name: --segmented-control-current-item;

@supports not (anchor-name: --value) {
background-color: var(--controlKnob-bgColor-rest);
border-color: var(--controlKnob-borderColor-rest);
/* stylelint-disable-next-line primer/borders */
border-radius: var(--segmented-control-outer-radius);
}
}
}

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