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Walkthrough新增 Changes原生拖拽边缘滚动
Priority: ⬇️ Low Estimated code review effort: 3 (Moderate) | ~25 minutes Change: Bug fix Sequence Diagram(s)sequenceDiagram
participant List
participant useDragEdgeScroll
participant Container
participant ownerDocument
List->>useDragEdgeScroll: 注册边缘滚动监听
Container->>useDragEdgeScroll: 发送 dragover 和指针位置
useDragEdgeScroll->>List: 通过 onScrollOffset 更新虚拟滚动
ownerDocument->>useDragEdgeScroll: 发送 drop 或 dragend
useDragEdgeScroll->>useDragEdgeScroll: 停止 RAF 循环
Merge Risk: ⚪ Minimal · up to No actionable risk remains from the reviewed drag-edge-scroll changes; the implementation is ready to merge. 🚥 Pre-merge checks | ✅ 4 | ❌ 1
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## master #387 +/- ##
==========================================
+ Coverage 97.62% 97.77% +0.15%
==========================================
Files 19 20 +1
Lines 843 900 +57
Branches 206 217 +11
==========================================
+ Hits 823 880 +57
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@src/hooks/useDragEdgeScroll.ts`:
- Line 66: Update the onDragOver handler in useDragEdgeScroll to use a
_virtualHandled flag on the drag event: return immediately when the flag is
already set, otherwise mark it before performing edge-scroll processing. This
ensures only the innermost virtual List handles a bubbling dragover event and
starts the RAF loop.
In `@tests/dragEdgeScroll.test.js`:
- Line 151: Update the second fireDragOver call in the drag-edge scroll test to
use the same clientY value as the first call, 95, so both events produce the
same scroll offset and the assertion can distinguish one loop from two.
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src/List.tsxsrc/hooks/useDragEdgeScroll.tssrc/hooks/useScrollDrag.tstests/dragEdgeScroll.test.js
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Ye-YiChen
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Sep 21, 2026
| import * as React from 'react'; | ||
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| function smoothScrollOffset(offset: number) { | ||
| export function smoothScrollOffset(offset: number) { |
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Should I export this function or create a same function in the useDrageEdgeScroll.ts?
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A virtual list does not scroll when an item is dragged to its top/bottom edge, so items outside the viewport can't be reached. The container is `overflow: hidden`, which disables the browser's native drag-to-edge autoscroll, and the JS fallback in `useScrollDrag` cannot cover it: it runs on `mousemove`, which the browser does not fire during a native HTML5 drag. It also skips draggable targets on purpose (see react-component#386) so the mouse path never fights the native drag - that skip is kept as is. Add `useDragEdgeScroll` next to it to drive the scrolling from the drag events: `dragover` computes the offset from the pointer's distance to the edge and keeps a rAF loop running, `dragleave` / `drop` / `dragend` cancel it. `dragover` only fires while a native drag is in progress, so the hook needs no "is dragging" flag from the consumer and can stay mounted: consumers such as rc-tree get the behavior without passing any state. `drop` and `dragend` are listened on the document in the capture phase, because a consumer's node may stop their propagation in the bubble phase (rc-tree's TreeNode does). Band sizing (`min(itemHeight * 1.2, height / 4)`) and easing reuse `smoothScrollOffset` from `useScrollDrag`, so both paths feel the same.
A nested virtual List (see examples/nest.tsx) is rendered inside the item of another one, so a dragover on an inner item bubbles to both holders. Both useDragEdgeScroll listeners ran and each started its own rAF loop, scrolling the outer list as well. Mark the event the same way useScrollDrag already does on mousedown: the innermost holder sees it first, the outer ones bail out. dragover fires repeatedly while the drag lasts, so the flag is set per event. Also use the same clientY for the second dragover in the loop-reuse test. Different coordinates yield different offsets (floor(sqrt(19)) = 4 vs floor(sqrt(12)) = 3), which masked the difference between one loop and two - with one coordinate the assertion can actually tell them apart.
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Friendly ping @zombieJ . |
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结论先行
主要变更内容接入原生拖拽滚动List 新增独立的原生拖拽处理，通过现有滚动同步逻辑更新位置。源码变更 + useDragEdgeScroll(inVirtual, componentRef, height, itemHeight, (offset) => {
+ syncScrollTop((top) => top + offset);
+ });边缘滚动与停止条件新增 Hook，根据指针距上下边缘的距离驱动 RAF；离开容器或拖拽结束时停止，嵌套列表通过事件标记避免重复处理。 + const edgeThreshold = Math.min(itemHeight * 1.2, height / 4);
...
+ ownerDocument.addEventListener('drop', stopScroll, true);
+ ownerDocument.addEventListener('dragend', stopScroll, true);复用滚动速度计算导出已有的速度计算函数，供新 Hook 使用。 - function smoothScrollOffset(offset: number) {
+ export function smoothScrollOffset(offset: number) {
return Math.floor(offset ** 0.5);
}另新增 1 个测试文件，包含 11 个用例，本地全部通过。 问题清单（按重要程度排序）🔴 高优先级（阻塞合并）
🟡 中优先级（建议修复）无。 🟢 低优先级（可选改进）无。 |
Dragging from the edge of a virtual List into a nested one left the outer loop running. The outer `dragover` handler bails out as soon as the event was already handled by the inner list, but it never cancelled its own RAF loop, and `dragleave` does not fire while the pointer stays inside the container — so the outer list kept scrolling with the pointer sitting on the nested list, and both lists moved once the pointer reached the nested edge. Stop the loop in that branch and cover both cases.
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Thanks, and both cases are covered now:
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🤔 This is a ...
🔗 Related Issues
Follow-up of #386
Part of ant-design/ant-design#58508 (Tree virtual scroll + drag)
Suggested by @zombieJ in react-component/tree#1076 (comment)
💡 Background and Solution
A virtual list does not scroll when an item is dragged to its top/bottom edge, so items outside the viewport can't be reached.
Two reasons nothing scrolls:
overflow: hidden, so the browser's native drag-to-edge autoscroll is disabled.useScrollDragcan't cover it. It runs onmousemove, which the browser does not fire during a native HTML5 drag, and since fix: skip drag-scroll when the target or its ancestor is draggable #386 it returns early when the target is draggable — by design, so the mouse path never fights the native drag. That skip is kept as is.So the drag needs a path of its own. Add
useDragEdgeScrollnext touseScrollDrag:dragovercomputes the offset from the pointer's distance to the edge and keeps a rAF loop running;dragleave/drop/dragendcancel it.No
draggingflag is needed.dragoveronly fires while a native drag is in progress, so the hook detects the drag by itself and can stay mounted — consumers such as rc-tree get the behavior without passing any state. This is the "self-detection" option from the rc-tree discussion.Other notes:
drop/dragendare listened on the document in the capture phase: a consumer's node may stop their propagation in the bubble phase (rc-tree'sTreeNodedoes).min(itemHeight * 1.2, height / 4)— theheight / 4cap keeps an idle zone in the middle on short containers.smoothScrollOffsetfromuseScrollDrag(now exported), so both paths feel identical.inVirtual, same asuseScrollDrag.✅ Verification
Red / green double run with the hook call in
Listremoved and restored (full suite, same batch both times):dragEdgeScroll.test.jsThe 3 that stay green without the hook are the negative cases (idle zone, boundary,
virtual={false}) — they assert nothing happens, which is the expected false-green trap, so every one of them is preceded by an assertion proving the loop was live first.useDragEdgeScroll.tsis at 100% statement / branch / function / line coverage. Cases: scroll down at the bottom edge, scroll up at the top edge, idle middle zone, the band boundary where the offset is 0, re-entering the band while the loop already runs (must not double the speed),drop,dragendreleased outside the container,dragleave(leaving stops it, moving between inner nodes does not), andvirtual={false}left to the browser.End-to-end: verified in a browser with rc-tree's
draggabledemo aliased to this source — dragging a node to the edge scrolls the list, and it stops on release.Full suite: 10 suites / 294 tests passed.
tsc --noEmitclean, eslint 0 errors, prettier clean.📝 Change Log
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