fix: normalize wheel deltaMode to pixels for smoother virtual scroll - #380
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Changes滚轮处理
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to The PR makes a localized wheel-delta normalization change with no actionable merge-blocking risk remaining beyond normal checks and review. Suggested reviewers: Poem
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@src/hooks/useFrameWheel.ts`:
- Around line 105-108: 同时传递原始增量与归一化增量：修改 onWheelY，使其分别接收原始 deltaY 和归一化后的
mergedDeltaY；将原始值写入 wheelValueRef.current，并使用归一化值进行滚动计算。更新 shiftKey 或 sx 分支，使
mergedDeltaX 使用归一化的 mergedDeltaY，而不是原始 deltaY，以保持行模式和页模式的正确滚动距离及 Firefox 修补逻辑。
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src/hooks/useFrameWheel.ts
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…a for Firefox patch
Codecov Report❌ Patch coverage is
Additional details and impacted files@@ Coverage Diff @@
## master #380 +/- ##
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- Coverage 97.60% 97.39% -0.22%
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Files 19 19
Lines 836 844 +8
Branches 209 211 +2
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+ Hits 816 822 +6
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Actionable comments posted: 1
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Inline comments:
In `@tests/scroll.test.js`:
- Around line 339-351: Update the wheel normalization tests around the existing
line-mode and page-mode cases to explicitly set deltaX to 0, then add a
horizontal scrolling case that sets deltaY to 0 and verifies onWheelX behavior
after normalization. Ensure both line and page delta modes are covered so
undefined-axis values cannot produce NaN unnoticed.
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Inline comments:
In `@tests/scroll.test.js`:
- Around line 382-384: Update the test around onWheelX to assert the normalized
horizontal offset of 48 (or that the callback receives 48), rather than only
asserting preventDefault was called; retain preventDefault coverage only if
needed separately.
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fix: normalize wheel deltaMode to pixels for smoother virtual scroll
useFrameWheel treated WheelEvent.deltaY/deltaX as raw pixels regardless of WheelEvent.deltaMode. Browsers may report wheel deltas in lines (deltaMode === 1) or pages (deltaMode === 2) rather than pixels — notably Firefox and some Windows mice — so scroll distance was inconsistent and felt jumpy across devices.
This normalizes deltas to pixels based on deltaMode (× 16 per line, × 100 per page) before they're applied. Pixel mode (deltaMode === 0, the common case) is unchanged, so there's no behavior change for most users.
Reported downstream in ant-design/ant-design#56496 (Select dropdown scroll not smooth). antd's virtual scroll comes from this package.
I kept the existing Firefox × 10 multiplier and rAF batching untouched to keep the change minimal; happy to revisit whether the multiplier is now redundant if reviewers prefer.
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