Nine surfaces hand-rolled the same anchored-overlay + row-list + barrier +
keyboard-nav pattern. Extract one owned primitive (no Material):
- ClideAnchoredOverlay (clide_anchored.dart): positioning + lifecycle —
LayerLink/CompositedTransformFollower or centred Positioned, side/align +
auto-flip on viewport bounds, full-screen tap-away barrier, OverlayEntry
bookkeeping, focus capture, Esc-to-close. Driven by a ClideOverlayController.
- ClideMenu + ClideMenuListController (clide_menu.dart): a dropdown-token row
surface (items + separators) with arrow/enter/escape nav, skip-disabled,
active mark, per-item colour/leading glyph, keepOpenOnSelect (live-apply),
and onArrowLeft/Right hooks. The nav controller is reusable by surfaces that
keep bespoke rows (typeaheads, quick-open).
Additive — no call sites changed yet. D-88 records the convention (new `design`
domain): anchored pickers build on these; modal pickers stay on DialogRouter.
Tests: clide_anchored_test (open/close, barrier, Esc, centred, clean dispose)
and clide_menu_test (list-nav skip/wrap, select + onClose, disabled, Esc,
keepOpenOnSelect; pure ClideMenuListController cases).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.8
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