feat: support scrollPosition to align active tab on switch - #1016
feat: support scrollPosition to align active tab on switch#1016EmilyyyLiu wants to merge 3 commits into
scrollPosition to align active tab on switch#1016Conversation
Add a `scrollPosition` prop ('auto' | 'start' | 'center' | 'end' | number)
to control where the active tab is scrolled to when switching. `auto`
keeps the legacy edge-aligned behavior; the others align the active tab
to the start/center/end of the viewport (or a custom ratio). Closes
ant-design/ant-design#39433.
Co-Authored-By: Claude <noreply@anthropic.com>
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No actionable comments were generated in the recent review. 🎉 ℹ️ Recent review info⚙️ Run configurationConfiguration used: Organization UI Review profile: CHILL Plan: Pro Plus Run ID: 📒 Files selected for processing (3)
Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. Walkthrough新增 ChangesScrollPosition 标签滚动定位
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to The PR adds configurable active-tab scroll alignment while preserving the existing default behavior; no actionable merge-blocking risk remains, so it is merge-ready after normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Tabs
participant TabNavList
participant scrollToTab
participant ScrollContainer
Tabs->>TabNavList: 传递 scrollPosition
TabNavList->>scrollToTab: 定位当前标签
scrollToTab->>ScrollContainer: 计算并应用滚动偏移
ScrollContainer-->>TabNavList: 更新可视位置
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🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
🧪 Generate unit tests (beta)
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #1016 +/- ##
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+ Coverage 98.98% 99.00% +0.01%
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Files 18 18
Lines 791 806 +15
Branches 238 244 +6
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+ Hits 783 798 +15
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Cover the numeric-ratio and clamp-to-[0,1] edges (1.5 → end, -0.5 → start) on both top and left tab positions, and add an RTL parameterized suite. Keeps the cases as a single shared table per direction for readability. Co-Authored-By: Claude <noreply@anthropic.com>
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Inline comments:
In `@src/TabNavList/index.tsx`:
- Around line 270-279: Update the scrollPosition ratio calculation to reject NaN
numeric values and fall back to the existing “auto” behavior before clamping or
applying the ratio, preventing NaN from reaching newTransform or CSS
translate(). Add regression coverage for NaN scrollPosition in the overflow and
RTL test suites.
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docs/demo/scroll-position.mddocs/examples/scroll-position.tsxsrc/TabNavList/index.tsxsrc/Tabs.tsxsrc/interface.tstests/overflow.test.tsxtests/rtl.test.tsx
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A NaN reaches the numeric branch (typeof NaN === 'number') and survives Math.min/Math.max, which would otherwise produce translate(NaNpx) and silently break scrolling. Reject NaN so it falls through to the legacy auto behavior. Adds NaN regression cases to the LTR and RTL suites. Co-Authored-By: Claude <noreply@anthropic.com>
1 participant
背景
对应 ant-design/ant-design#39433。
该 issue 希望能在标签页溢出滚动时,控制选中(activated)tab 的滚动对齐位置——尤其在移动端,用户期望切换时让选中标签居中显示,而不是仅当它移出视口时才勉强滚入并对齐到最近的边缘。当前实现是:仅当 active tab 超出视口时才滚动,且对齐到最近的边缘。
本 PR 做了什么
新增 `scrollPosition` 属性:
```ts
type ScrollPosition = 'auto' | 'start' | 'center' | 'end' | number;
```
```tsx
```
实现
在 `scrollToTab` 中,将字符串/`number` 解析为 `ratio`(`'auto'` 时为 `null`)。当存在 ratio 时,计算一个让 tab 的 `ratio` 点与视口同一 `ratio` 点对齐的 transform,再通过既有的 `alignInRange` 进行夹取。兼容 LTR/RTL(top/bottom)以及 left/right 两种 `tabPosition`。
类型导出
`ScrollPosition` 定义在 `interface.ts`,但未从包入口单独 re-export——与 `TabPosition` 等其它叶子联合类型保持一致。使用方应通过 `TabsProps['scrollPosition']` 获取,demo 示例亦是如此。
测试
在 `tests/overflow.test.tsx` 中新增 `scrollPosition` describe 块,覆盖 `auto`/`start`/`center`/`end`/数值比例(`tabPosition: 'top'`),以及 `center` 在 `tabPosition: 'left'` 下的场景。`overflow.test.tsx` 全部通过(28 passed)。
Demo
新增 `scroll-position` 示例,注册于 `docs/demo/scroll-position.md`,提供 `scrollPosition`、`direction`(ltr/rtl)、`tabPosition`(top/bottom/left/right)的切换。
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Summary by CodeRabbit
scrollPosition配置，支持将当前标签定位到起始、居中、末尾或指定比例位置。