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DropdownMenu: under a finger the trigger opens as the finger presses (AST-094 FR29) - #8078

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@vjeux vjeux commented Oct 24, 2026 •

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Depends on #8627, #8360, #8298, #8671. Review only this PR's change: vjeux/astryx@b7c67d6...dcda3d0

User need

Under a finger, on a phone or a touchscreen laptop, a DropdownMenu or MoreMenu opens only when a tap lifts or after a 500 ms hold. On iOS it opens as the finger presses, so the same finger slides straight to a row.

What led to it: the same UIKit comparison as #8627, on the iOS 26.2 simulator (spec:AST-094 FR29); FR43 applies it on every device.

Problem and solution fit

Under a finger, on every device, the trigger opens on press. In a scrolling page it first waits UIKit's 150 ms content-touch delay, so a flick still scrolls; drifting over 13 px in that time is a scroll, and nothing opens. The opening finger then picks only after #8627's 10 px handoff.

Current specification

spec:AST-094 FR26–FR30 and FR43 (current); module:DropdownMenu/useMenuPress (current); component:DropdownMenu FR8 (proposed).

Public delta and caller burden

Design and alternatives

  • One delay everywhere: a fixed bar would lag.
  • No delay: a scroll's first touch would open a menu.
  • UIKit's rule (chosen): open on press, except in a scroll view, which waits for the content-touch delay. The 13 px drift matches the simulator (12 pt opened, 14 pt did not).

Evidence

iOS 26.2 simulator, Safari, a scrolling page: press "Actions", slide to "Duplicate" (opens at 156 ms; main: 500 ms):

main this PR
main this PR

Android Chromium 158 emulator, a page that doesn't scroll: the press opens it.

main this PR
main this PR

Fine pointers (spec:AST-017 FR59): a pen now opens the menu on press on every device, as a finger does, for cross-device consistency (spec:AST-094 FR43; module:DropdownMenu/useMenuPress FR1); a mouse is unchanged. Real Chromium, fine primary pointer, Default story, time from press to open:

Input on "Actions" main this PR
Mouse press at the press (11–19 ms) at the press (13–14 ms), unchanged
Pen held after the 500 ms hold (508 ms) at the press (14–15 ms)
Pen tap, lifted at ~70 ms at the lift, through its click (78–83 ms) at the press (12–14 ms); the lift picks nothing

Scope

  • One capability is added.
  • Unrelated fixes, cleanup, and policy changes were removed or split.
  • Consumer docs, focused tests, and migration evidence ship with the feature.
  • Public text and artifacts contain no internal Meta context.

Testing

On the DropdownMenu "Default" story, with touch emulation:

  1. Press "Actions": the menu opens with the finger still down. Slide to "Duplicate" and lift: it runs once.
  2. Tap "Actions": it opens on the press and stays open after the lift; nothing is picked.
  3. On a page that scrolls, flick across the trigger: the page scrolls and no menu opens.
  4. With a pen, the press opens it at once; with a mouse, nothing changes.

Automated: unit tests for each case, on a fine primary pointer too (three failed before #8627 keyed the press model on presentation), a pen case in jsdom and in real Chromium (both failed on the previous head), and DropdownMenuTouchPress (Chromium, WebKit).

Stack (merge in this order): #8360 (which carries #8076, #8073 and #8446), #8298 and #8627 (any order) → #8671 → this PR. Main's touch-bundle check fails here until #8671 makes it per component: the trigger's scroll-view wait is gesture code.

#8360 also changes useMenuPress.ts. This PR moves #8360's trigger changes into menuTriggerPress.ts: the long-press detector, FR29's 13 px drift allowance passed as each press starts on every device, and the shared click guard's window. #8360's own trigger tests pass on the moved code.

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Project Deployment Actions Updated
astryx Ready Ready Preview Oct 29, 2026 10:49pm UTC

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@meta-cla meta-cla Bot added the CLA Signed This label is managed by the Meta Open Source bot. label Oct 24, 2026
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AI review status for this pull request.

Review status Updated
🟡 Reviewed (for maintainers only) Oct 29, 2026, 11:09 PM UTC

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This pull request can't be approved yet: its main changes — the 150 ms finger hold-open (300 ms in a scroller) with a 13 px drift allowance, the 10 px handoff before the finger that opened a menu can pick, and the new public continueGesture — are not stated in any approved spec, because module:DropdownMenu/useMenuPress FR9 and DEC-4 are still proposed and still describe a 500 ms delay and the settle rule. An engineering owner needs to decide that direction, together with the new draft spec:AST-094, the touchOpen DEC-8 and the adaptive-query change measured against Selector DEC-1; once the module record carries the proposed text, an engineering owner records the decision by commenting /approve-spec <full head SHA> on this pull request, and the author may do so if they are an engineering owner. Independently of that decision, please address:

  • Land the four dependencies first, or base this pull request on their branch, so its diff is this change's own ~1,000-line commit rather than 24,416 lines.
  • useMenuPress.doc.mjs docsDense still says a finger never triggers onDismiss, which is no longer true with touchOpen: 'press', and it lists neither touchOpen nor continueGesture.
  • spec:AST-094 FR7 proposes amending spec:AST-090, which does not exist in the repository.

[Automated review]

Comment thread packages/core/src/hooks/useMenuPress.ts Outdated
* UIKit's hold-open delay for a pull-down button (`menu.holdOpenMs`). A tap
* released sooner opens the menu through the trigger's click.
*/
export const MENU_PRESS_LONG_PRESS_MS: number = menu.holdOpenMs;

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The default hold-open is now menu.holdOpenMs (150 ms, 300 ms in a scroller), but useMenuPress.spec.md still lists the long-press delay as 500 ms (proposed) and FR9 still sends the opening finger through the settle rule. The module record needs the new values (FR9, DEC-4 and the constant row) for an engineering owner to approve before this default ships.

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Fixed at 309b4eb: useMenuPress.spec.md now carries the proposed values, pending owner review: the long-press row (150 ms, 300 ms inside a scrolling region, on every touch device), a 10 px handoff row, FR9’s handoff and cancel, and DEC-4’s mouse-only settle rule.

Comment thread packages/core/src/hooks/useMenuPress.ts Outdated
* this call; a mouse follows the settle rule. Ignored while another gesture
* is live.
*/
continueGesture: (pointer: MenuPressContinuation) => void;

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continueGesture and MenuPressContinuation are new public API on an exported hook, but nothing in the repository calls them and no spec record names them. Consider leaving them out until a consumer such as ContextMenu adopts them, or add them to the module record for an owner's decision.

@vjeux vjeux Oct 25, 2026 •

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Kept and listed for the owner decision. continueGesture hands a menu a pointer that went down elsewhere (a context menu's long press), and the record's Public contract row now names it with MenuPressContinuation. It comes out if the owner prefers to wait for a consumer.

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Removed at fcecec5: continueGesture and MenuPressContinuation have no caller (spec:AST-002 DEC-1), and the record no longer names them.

@@ -170,7 +183,8 @@ export const docsDense = {
'options.onDismiss': 'MOUSE released outside: close. Finger: never called.',

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With touchOpen: 'press' the hook does call onDismiss for a finger (when the browser takes the press before it reaches the menu), so Finger: never called. is now wrong. The dense block also misses touchOpen and continueGesture.

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The continueGesture entry is in docsDense at 309b4eb. The touchOpen and onDismiss lines belong to #7240, whose new head (166c0ce, merged here) rewrites them.

follows.
- **FR7 — Exits animate as UIKit's do.** A touch presentation MUST play the
exit its UIKit counterpart plays. **Proposed; pending owner review:** this
departs from the draft `spec:AST-090` FR1 (exits off by default) and FR10

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spec:AST-090 does not exist on main or at this head, so this proposed amendment (and the one in Current-state impact) points at nothing an owner can rule on. Cite it once it lands, or drop it here.

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AST-094 is now the maintainer’s record in #8316 (one touch model on every touch device); the body cites it there.

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PR Analysis Report

📚 Storybook Preview

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🧪 Sandbox Preview

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Modified Components

ContextMenu (@astryxdesign/core) · View in Storybook
Metric Before After Delta
Entry File (ESM) 1.1KB 1.1KB 0B
Lines of Code 678 678 -
Complexity Very High Very High (86) -
MoreMenu (@astryxdesign/core) · View in Storybook
Metric Before After Delta
Entry File (ESM) 219B 219B 0B
Lines of Code 87 87 -
Complexity Low Low (4) -

Component Size

Component Import before Import after Delta CSS before CSS after Delta
core/AlertDialog 57.3KB 57.4KB +119B 12.5KB 12.5KB 0B
core/AppShell 66.8KB 66.9KB +96B 11.8KB 11.8KB 0B
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richtext/RichTextEditorToolbar N/A 213.0KB N/A N/A 454B N/A
richtext/RichTextView N/A 252.0KB N/A N/A 2.3KB N/A

Sizes are gzip. Import counts the JavaScript the import loads eagerly; CSS counts the package stylesheet rules referenced by the modules it can load from its own package, lazily loaded ones included.

Bundle Size Summary

Gzip figures measure each package's entry file, not the code an import pulls in.

Package Entry (ESM) Entry gzip before Entry gzip after Delta
@astryxdesign/core 4.9KB 1.2KB 1.2KB 0B
Package stylesheet Gzip before Gzip after Delta
@astryxdesign/core 35.4KB 35.4KB 0B

Accessibility Audit

Status: No accessibility violations detected.

Visual Regression

55 of 504 shot(s) changed.

A change here is a question, not a failure: check whether the after is the
picture you intended. Record that review on the PR. Baseline maintenance is an
explicit dispatch of CI; this report never rewrites the baseline or adds a release gate.

component story theme mode pixels
Selector Indicator Space Bottom Sheet Narrow End RTL neutral light 753,933
Selector Indicator Space Bottom Sheet Wide Start neutral light 740,072
RichTextEditor Markdown parity: side by side probe dark 558,840
RichTextEditor Markdown parity: side by side probe light 540,756
Chat Full AI Chat probe light 230,823
Chat Full AI Chat probe dark 229,805
AppShell With Mobile Nav probe light 217,010
AppShell With Mobile Nav probe dark 216,960
Collapsible Dividers probe dark 66,445
Collapsible Dividers probe light 66,445
AppShell Playground neutral dark 65,198
AppShell Playground neutral light 63,788
Chat Default neutral dark 36,304
Chat Default neutral light 35,767
Chat Empty State probe light 23,531
Chat Empty State probe dark 22,622
ChatAutoScroll Scroll Behavior Comparison neutral dark 15,378
ChatAutoScroll Scroll Behavior Comparison neutral light 14,107
Chat With Attachments probe light 13,406
Chat With Attachments probe dark 11,232

and 35 more.


Generated by PR Enrichment workflow | Storybook | Sandbox | View full report

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This pull request can't be approved yet: its main changes — the 150 ms finger hold-open (300 ms in a scroller), the 10 px handoff before the finger that opened a menu can pick, the cleared highlight after a cancelled press and the new public continueGesture — are not stated in any approved spec, because module:DropdownMenu/useMenuPress FR9 and DEC-4 are still proposed and still describe a 500 ms hold and the settle rule. An engineering owner needs to settle that direction, together with the draft spec:AST-094, touchOpen (DEC-8) and the adaptive sheet query measured against Selector DEC-1; once the module record carries the proposed text, an engineering owner records the decision by commenting /approve-spec <full head SHA> on this pull request, and the author, as an engineering owner, may do so. Independently of that decision, please address:

  • Land the four dependencies first, or base this pull request on their branch, so its diff is this change's own ~1,060-line commit rather than 26,635 lines.
  • .changeset/menu-press-uimenu.md should name the old 500 ms longPressDelayMs default and how to keep it, and say that the hook adds 150 ms to a caller's own value inside a scroller.
  • useMenuPress.doc.mjs docsDense still says a finger never triggers onDismiss, and it lists neither touchOpen nor continueGesture.
  • spec:AST-094 FR7 proposes amending spec:AST-090, which does not exist in the repository.

[Automated review]

Comment thread .changeset/menu-press-uimenu.md Outdated
'@astryxdesign/core': patch
---

[feature] A finger on a DropdownMenu or MoreMenu trigger follows UIMenu: resting on the trigger opens the menu after 150 ms (UIKit's delay; 300 ms inside a scrolling region, which waits for the scroll view's content-touch delay first), and the finger that opened the menu picks a row only after it has moved 10 px, so a menu that appears under a resting finger never picks the row beneath it. A mouse keeps its settle rule. `useMenuPress` gains `continueGesture` for a pointer that went down elsewhere (a context menu's long press), and `longPressDelayMs` defaults to 150.

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This changes a released default (longPressDelayMs 500 → 150 ms). Under AST-017 FR3 the changeset should name the old and new default and the option that restores the old one. Note too that longPressDelayMs: 500 opens at 650 ms inside a scroller, because the hook adds 150 ms to a caller's own value (useMenuPress.ts:812-821).

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Fixed at 309b4eb: the changeset names the old 500 ms default and the new 150 ms on every touch device, says longPressDelayMs: 500 keeps the old one, and states that inside a scrolling region the content-touch delay is added to any value, a caller’s own included.

@cixzhang

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Posted by Cindy's agent on her behalf.

Parts of this PR re-implement behavior that already exists, or is being specified, as a shared part of core. Converging keeps one implementation per behavior:

This is about where the behavior lives, not about the PR's intent.

@vjeux

vjeux commented Oct 24, 2026

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Agreed: one implementation.

  • Raw touch listeners: the held finger's touchmove block moves onto the gesture host, in the shared-tracker change that follows this stack.
  • Long press: the held finger runs on useLongPress's detector (start, moveTo, cancel); the menu passes UIKit's hold-open values from the constants table as its delayMs and moveCancelPx.

@vjeux
vjeux force-pushed the uikit/c19-menu-press branch from 6b1e606 to 309b4eb Compare October 25, 2026 01:56
@github-actions github-actions Bot added the needs:design-review Affects visuals — Design should review label Oct 25, 2026
@github-actions
github-actions Bot requested a review from cvkxx October 25, 2026 01:57
vjeux added 29 commits October 28, 2026 11:33
meta#8076's new head carries main 70ea859 with meta#8073's writer of the press
attribute on main's press controller, and its README names both writers.
utils/pressFeedback.ts keeps that controller with this line's own changes
on it: the pointer, drag, scroll and visibility listeners through the
shared input stream (meta#8356) and touchcancel only while the primary pointer
is coarse (meta#8270); the key path stays at the window's bubble phase, so a
Space press the page cancels paints nothing. usePressTracker stays in its
own module, one tracker for a component's life (meta#8315), so meta#8073's
rebuilt-tracker hook and its test are not taken. The harness files are
meta#8076's.
…s, and the action-group tracker writes its own

The header and writePress called it the one writer of the press attribute,
but main's action-group tracker writes its groups' presses itself. They now
say what holds, as meta#8076's gestures README does.
…he press attribute

The release note said every press painter writes data-astryx-press
through one internal writer, but the action-group tracker
(hooks/actionGroupTracker.ts) writes its groups' presses itself, as the
gestures README and utils/pressFeedback.ts already say. The note now says
paintPress writes every press it tracks and the action-group tracker
writes its own.
…llowance under every primary pointer

The useMenuPress record's FR9 puts the trigger's held finger under
spec:AST-094 FR29 under every primary pointer (FR43), so a finger on a
touchscreen laptop may drift 13 pt before the open, as on a phone. The
trigger read (pointer: coarse) as its press started and took the long
press's 10 px where the pointer was fine. Three cases fail until it does
not: a 12 pt drift opens under a fine pointer too, a (12, 12) settle
opens there, and nothing reads a pointer query, the trigger's press
included.
…lowance under every primary pointer

The useMenuPress record's FR9 governs the trigger's held finger by
spec:AST-094 FR29 under every primary pointer (FR43). The trigger now
hands the long press FR29's 13 px drift allowance whatever the primary
pointer, so it no longer reads (pointer: coarse) as its press starts, and
the menus drop their coarsePointer import. ContextMenu keeps the long
press's own allowable movement. The changeset says the same.
Strict ESLint reported six unused bindings in files this pull request
carries: the host's HAPTIC_SWITCH_ATTRIBUTE import, two unused imports
in the pan's tests (scrollProbe, ScreenEdgePanGestureRecognizer), the
swipe test's drift, the presented-hit-testing test's gestures, and a
GestureHost test's before, which now asserts what it was read for: a
second finger's moves leave the pan where it was.
…eal angular speed

The release velocity of a rotation whose listener sets rotation = 0 on
each change, at 2 degrees every 16 ms, read 4.363 rad/s against the
2.182 rad/s of the same stream without a re-base: the test asserted only
more than 1.5. It now asserts the 2.18 rad/s (spec:AST-100 FR2), and
fails.
The rotation's velocity tracker samples the raw unwrapped angle, which
setting rotation does not move, so the setter's shift of the samples read
each re-base as extra turn and doubled the release velocity of a
listener that re-bases on every change. The setter no longer touches the
tracker.
…mates while it runs

The proof read the element's animations 230 ms in, after the dip had
ended, and asserted only that every animated key is opacity, which an
empty list passes: with the cross-fade removed from the plan (the move
still landing), the proof still passed. It now reads the keyframe keys
right after the call starts and asserts they include opacity and nothing
else; the same mutant fails it. Chromium and WebKit pass. (F1's in-flight
read from c648034.)
…roller, and its claimed moves are cancelled under pointer events

Two comparisons stop at the shadow boundary, each failing a case:
- once the host's listener on a recognizer's inner node has seen the
  finger, isFingerDownIn reads it as outside a light-DOM scroller around
  that root, so a scroll under it is not the finger's (FR20);
- under inputMode 'pointer-events', a claimed pan on a shadow host
  cancels none of its finger's moves over the inner content, since the
  finger's target is the inner node and its touches reach the host
  retargeted (FR19).
…the flat tree

isFingerDownIn and the pointer-events finger match compare with
containsAlongFlatTree, as the scroll watch already does: a finger on
content inside an open shadow root is down in the scroller around that
root, and its touches, retargeted to the shadow host, match its pointer
finger, so a claimed pan cancels its moves there (spec:AST-094 FR19,
FR20).
…achments asks, and only then

The host let the last attachment decide whether an element is an action
group (useGestureRecognizer always passes the option), and never
recomputed it at a detach: a plain attachment after the group's turned
the group off, and a group's attachment released left a recognizer that
never asked taking presses under a fine pointer. Fails until the host
counts the attachments that ask.
…ents asks

The host counts the attachments that pass actionGroup: true and keeps the
element a group while one remains, recomputed at each detach. An
attachment that passes false, as useGestureRecognizer does by default,
no longer turns a group off, and a group's last asking attachment taking
its leave ends the group.
… that content

The presented hit test takes the document's elementFromPoint, which
answers a shadow host for anything inside its open root, and compares
with Node.contains, which stops at the boundary: a recognizer on a
control inside a moving sheet's shadow root gets no finger, and the tap's
click goes to the host. Fails until the hit test descends into open roots
and compares along the flat tree.
Where a moving element is drawn away from its layout box, the host
hit-tests what is drawn under the finger with the document's
elementFromPoint, which answers a shadow host for anything inside its
open root. The hit test now descends through each open root's own
elementFromPoint and compares with the movers along the flat tree, so a
recognizer on a control inside a moving sheet's shadow root gets its
finger and the tap clicks that control.
…nt lets go

The host's touch-action rules sit in an adopted sheet or a style element
per document or shadow root, and were never removed, so a page whose
last recognizer detached kept them, against spec:AST-094 FR24 (nothing
touch-related remains after the last instance unmounts). Fails until a
root's rules go with its last marked element.
…th its last marked element

The touch-action writer records which elements it marked in each
document or shadow root, and when the last one is unmarked (its last
recognizer detached) it removes that root's adopted sheet or style
element, so nothing touch-related remains after the last instance
unmounts (spec:AST-094 FR24). A later mark writes the rules again; an
element marked in another root first lets go of the old one.
… the inline style it reads

- The motion registry, the host's engine gate and the README name the
  presented hit test as an engine workaround (spec:AST-013 FR6) with its
  review condition (re-measure on each iOS release; remove it once iOS
  WebKit hit-tests a compositor-moved element where it is drawn) and its
  regression fixture.
- While a curve runs the animator holds the value it starts from inline,
  so presentation.ts and the README no longer say the inline style holds
  the end.
…core/internal/touch

Core ships the internal entry @astryxdesign/core/internal/touch, which
re-exports the gesture primitives for Astryx's own packages, and the
Lab-import guard fails a Lab import of core outside core's exports
(architecture:react-component-runtime INV13). The README and the barrel's
header named internal workspace imports and said nothing here is
exported; they now name that entry.
…ill needs the element, and the listeners that cancel

The release note, the stream's header, the host's comment and the README
said the stream is one passive listener per event type and that a
document-capture stopPropagation no longer starves the recognizers. Such a
stop never hid a listener on the same node, and some subscriptions cancel.
They now say what changed: an app's window-capture stopPropagation, or a
document-capture stopImmediatePropagation registered before core, no
longer hides a touch; a recognizer that must claim still needs the touch to
reach its element; the gesture host's touchend, click and contextmenu
cancel while a claimer is attached and the page hold's touchmove while it
holds; and the stream stays ahead of an app's window-capture listener only
until a type's listener is re-added. The README's list of blocking
touchmove listeners gains the claimed touch's target and the document
while a claiming element moves.
…default it moves

The {stylexOptions} form of astryxStylex now passes StyleX
treeshakeCompensation: true unless the caller sets it. spec:AST-017 FR3
asks the release note to name the old and new default and the option
that restores the old one; it now does.
…er and for the two stops the input stream fixes

- A still finger with sub-pixel jitter over a scroll view keeps its tap
  and scrolls nothing (spec:AST-094 FR18–FR22).
- A tap is still recognized under an app's window-capture
  stopPropagation, and under a document-capture
  stopImmediatePropagation registered before core's: the recognizers hear
  touches on the window's capture phase.
Chromium and WebKit pass.
…s once

Where nothing that claims is attached, the host's touchend listener is
passive and cannot cancel the engine's own click after a retargeted tap
clicks what is drawn. The shared click guard swallows that late click
whatever is attached; this case pins it, as asked on meta#8293.
This pull request sat on meta#8076 and carried its old copies of the harness
meta#8045 and meta#8046 landed on main. meta#8360 carries meta#8076 with main's harness,
so after the merge this pull request's own diff is the presentation
resolver's commits. The one conflict, the gestures README, keeps both
sides: this pull request's paragraph on the presentation prop ends the
touch presentation section, and meta#8360's migration section follows it.
…esture host's subscriptions

The gesture host subscribes no click: the one cancelling click subscriber
is the click guard's, added at a window's first arm and kept. The release
note, the stream's header and the gestures README listed click with the
host's touchend and contextmenu; they now name the guard's own.
meta#8078's dependencies in one commit, so its compare link shows only its own change: meta#8627 503bc5b, meta#8360 045f666 (which carries meta#8076, meta#8073 and meta#8446) and meta#8298 8cb7c3a.
… as a dependency

meta#8627 is now one commit on main; meta#8360 carries meta#8076, meta#8073 and meta#8446.

useMenuPress.ts: the trigger half lives in menuTriggerPress.ts, so it
takes meta#8360's trigger changes there. The trigger's holds run on the
long-press detector and pass FR29's 13 px drift allowance as each press
starts, under every primary pointer (FR43). The hold duration comes from
motion/uikit/longPress.ts. MENU_PRESS_TRIGGER_DRIFT_PX is re-exported
beside MENU_PRESS_LONG_PRESS_MS. The stray-click window is the shared
click guard's, from meta#8360.

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Changes requested: the trigger's open on press follows spec:AST-094 FR29 on every device, but the diff still carries the full contents of #8076 (with #8446), #8298, #8360 and #8627, at least 27,956 of its 30,290 authored lines. Land those and #8671, then restack so the diff holds only the menu press, and name #8360 in the stack line until then. Also say "under a finger or a pen" in .changeset/menu-press-uimenu.md and the presentation docs of DropdownMenu and MoreMenu, since a pen's press now opens the menu too.

[Automated review]

'@astryxdesign/core': patch
---

[feature] Under a finger, on every device, a DropdownMenu or MoreMenu trigger now opens its menu as the finger presses, instead of after a 500 ms hold (`spec:AST-094` FR29, FR43). Inside a scroll view it opens once the 150 ms content-touch delay has passed with no scroll, so a scroll that starts on it still scrolls. To keep the previous behavior, a tap that opens at the lift and a 500 ms hold, pass `presentation="popover"`. A mouse is unchanged.

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A pen's press now opens the menu too (packages/core/src/hooks/menuTriggerPress.ts:225-227 treats every non-mouse pointer alike, and DropdownMenu.test.tsx:3131 pins it), so this note should say "under a finger or a pen"; the presentation entries in DropdownMenu.doc.mjs and MoreMenu.doc.mjs (both languages) need the same words (spec:AST-017 FR3).

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