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The custom modals each rolled their own Modal + animated-height + PanResponder +
keyboard handling, inconsistently. <FormSheet> is the single parametrized
composable, generalized from the proven PostCommentsSheet pattern:
- standard header: centred grabber + left-aligned title — NO Fertig/Abbrechen/
Zurück buttons (dismiss = swipe down / backdrop tap)
- resizable via drag on handle/header; drag-down past minHeightPct (or a fast
flick) dismisses
- height hard-capped at 75% of the screen — drag AND keyboard-expand
- keyboard-aware: sheet grows by the keyboard height (capped), iOS paddingBottom
pushes the content exactly above the keyboard; Android adjustResize handles it
- JS-driver height / native-driver translateY split (avoids the "height not
supported by native animated module" crash)
- props: title, initialHeightPct, minHeightPct, backdropOpacity, dismissOnBackdrop,
safeAreaBottom, growWithKeyboard, topRadius
Migrated (phase 1 — the no-input content sheets):
- ProtectionDetailsSheet → drops the bespoke Modal/PanResponder + the "Fertig"
header button; was 0.9–0.95 tall, now ≤0.75
- DeactivationExplainerSheet → was a pageSheet Modal with a "Zurück" button;
now the standard bottom sheet, header button gone
- PostCommentsSheet → capped its expand height 0.92 → 0.75 (TODO phase-1b: move
it onto <FormSheet> too instead of pinning magic numbers)
Phase 2 (next): <SheetFieldStack> — progressive multi-input flow (active input
pinned above the keyboard + "→" to advance, filled fields stack above, the rest
of the form reveals after the last field) for ConnectMailSheet / AddDomainSheet /
EditMailAccountSheet / CreateRoomSheet; then the auth/edit full-screen pages.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>