Hide document composer on scroll down on mobile - #327
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The document viewer's fixed bottom search composer on /documents/[id] was the one remaining mobile surface that stayed on screen while scrolling. Wire it into the existing phone-only useHideOnScroll hook (window scroll) so it slides off on scroll-down and returns on scroll-up, mirroring the bottom search dock's data-scroll-hidden pattern. Guards keep it visible while the mobile actions sheet is open or focus is inside the composer, so keyboard users never tab into invisible controls and typing with the iOS keyboard open cannot hide it. Covered by a phone-viewport Playwright spec in ui-smoke. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01UULp5Leufjv9WfbEHrRSgF
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BigSimmo
enabled auto-merge
July 6, 2026 13:16
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Summary
Adds hide-on-scroll behavior to the bottom composer in the document viewer on phones, matching the dock's existing behavior. The composer slides out of view when scrolling down past an activation offset and reappears when scrolling up or when keyboard focus enters the form.
Changes
useHideOnScrollhook to track scroll state and added focus tracking to prevent hiding the composer while keyboard users are interacting with it. The composer now respects three conditions before hiding: scroll state, mobile actions sheet visibility, and internal focus state.translateYwhendata-scroll-hidden="true", accounting for the bottom gap and safe area inset.Verification
npm run verify:ui— UI behavior and reduced-motion handling changednpm run format:checkNotes
The implementation ensures keyboard accessibility by preventing the composer from being hidden while focus is inside it, so users tabbing through form controls won't encounter invisible inputs. The mobile actions sheet also prevents hiding to maintain UX consistency when the sheet is open.
https://claude.ai/code/session_01UULp5Leufjv9WfbEHrRSgF