List

In review

Experimental: row zebra, not ratified

An opt-in zebra wash tones alternating rows (even rows on-card @ 4%, odd rows plain) on the list container: theme-following, default off, resting surface only (beneath hairlines / selection / hover). Experimental: under evaluation, not canon.

Live · web

Density

Grouped card: sections carry structure, no inset hairlines

Running2

Needs attention2

Zebra (experimental): opt-in alternating row tone

Full-bleed (plain): no card, edge-to-edge rules

Project files5

Selectable · single · ↑/↓ to move, one cyan indicator

Selectable · multi · leading checkboxes

Sticky section header: scroll the region

Today2

Earlier7

Loading (skeleton) & empty affordance

No sessions yetNew sessions will appear here.

Selected session r2 · 2 files checked · comfortable density. The container is live: change --color-divider and every hairline moves.

Code

// Web: React, consuming @dizyx/nockerl-tokens. (Web is the laggard platform. Spec + live demo,
// not yet exported from @dizyx/nockerl-react; promotion is tracked.)
// `List` is the CONTAINER; it arranges `NockerlListItem` rows (see the List item page).
import { NockerlListItem } from '@dizyx/nockerl-react';

export function SessionList({ groups, activeId, onSelect, density }: SessionListProps) {
  return (
    // variant: 'card' = lifted, inset grouped card · 'plain' = full-bleed (the dense tree)
    // selection: 'single' = listbox + arrow-key roving · 'multi' = leading checkboxes
    <List variant="card" density={density} selection="single" aria-label="Sessions">
      {groups.map((g) => (
        <ListSection key={g.key} label={g.label} count={g.items.length} sticky>
          {g.items.map((s, i) => (
            <NockerlListItem
              key={s.id}
              primary={s.name}
              secondary={s.statusLine}
              status={s.status}          // 'success' | 'warning' | 'error' | 'info'
              value={s.timeAgo}
              selected={s.id === activeId}
              onSelect={() => onSelect(s.id)}
              divider={i < g.items.length - 1}   // inset hairline BETWEEN rows
            />
          ))}
        </ListSection>
      ))}
    </List>
  );
}

// Android Jetpack Compose (canonical). The list container is a LazyColumn; the
// row is NockerlListItemRow (see the List item page). Compose ratified TWO list
// identities (Design Review #1, Decision 4): a DENSE flat tree and lifted cards.

// 1. Sectioned / grouped list: header item + row items per group, the TasksSheet
//    idiom. A LazyColumn with full-bleed rows; contentPadding sets the density.
LazyColumn(
    modifier = Modifier.fillMaxSize(),
    contentPadding = PaddingValues(vertical = 4.dp),   // dense tree spacing
) {
    groups.forEach { (section, rows) ->
        stickyHeader(key = "h-${section.id}") {           // sticky section header
            NockerlSectionHeader(label = section.title, count = rows.size)
        }
        itemsIndexed(rows, key = { _, r -> r.id }) { i, row ->
            NockerlListItemRow(
                leadingMark = { NockerlLeadingStatusMark(statusIcon(row.status), statusColor(row.status), row.status.name) },
                modifier = Modifier.fillMaxWidth().clickable { onSelect(row) }
                    .padding(horizontal = 16.dp, vertical = 12.dp),
            ) { Text(row.title, style = MaterialTheme.typography.bodyMedium, modifier = Modifier.weight(1f)) }
            if (i < rows.lastIndex) {
                HorizontalDivider(thickness = 1.dp, color = LocalNockerlColors.current.divider)   // hairline BETWEEN rows
            }
        }
    }
}

// 2. Lifted "card" list: spaced rows, depth on each card (the InboxList idiom).
LazyColumn(
    contentPadding = PaddingValues(horizontal = 12.dp, vertical = 8.dp),
    verticalArrangement = Arrangement.spacedBy(6.dp),
) { items(notifications, key = { "n-${it.id}" }) { NotificationCard(it) } }

// macOS SwiftUI (Voice). The GROUPED-CARD container: a scrolling LazyVStack of
// rows wrapped in ONE elevated card (depth lives on the card, rows are flat), with
// a SectionTitle header and a per-row bottom hairline. NockerlVoice/UI/HistoryView.swift
VStack(alignment: .leading, spacing: 14) {
    SectionTitle(title: "History")                       // the section header

    ScrollView {
        LazyVStack(spacing: 0) {                          // rows, no inter-row gap
            ForEach(filtered) { record in
                row(record)                               // the inline row (see List item)
                    .overlay(alignment: .bottom) {        // hairline BETWEEN rows
                        Rectangle().fill(NockerlTheme.hairline).frame(height: 1)
                    }
            }
        }
    }
    .scrollIndicators(.never)
    // The container is the elevated card: surface + hairline border + lift.
    .background(NockerlTheme.chromeSurface, in: RoundedRectangle(cornerRadius: NockerlTheme.cardRadius))
    .overlay(RoundedRectangle(cornerRadius: NockerlTheme.cardRadius).strokeBorder(NockerlTheme.hairline))
    .nockerlElevation()
}

// Multiple sections = stacked SectionTitle + card pairs in the parent ScrollView.
// For a native, automatically-sectioned/inset-grouped list, `List { Section { … } }
// .listStyle(.inset)` is the platform-native alternative (see drift note).

Parameters

List is the container; ListSection groups rows under a header; the row itself is ListItem. Selection, density, and the card-vs-plain surface are list-level concerns set on List.

Prop	Type	Default	Description
`variant`	`'card' \| 'plain'`	`'card'`	Surface treatment. `card` = a lifted, inset grouped card (depth on the container; inset hairlines). `plain` = full-bleed, no card or shadow, edge-to-edge rules (the dense tree).
`density`	`'comfortable' \| 'dense'`	`'comfortable'`	Row height + padding only, never the fill. `dense` tightens spacing and drops the supporting line.
`selection`	`'none' \| 'single' \| 'multi'`	`'none'`	List-level selection. `single` renders a `listbox` with arrow-key roving focus + the selected-row cyan edge + cyan ink + leading check (never a stripe, never a wash, Law 6); `multi` adds leading checkboxes.
`children` *	`ReactNode`		`ListSection` groups or bare `ListItem` rows.
`label (ListSection)` *	`string`		Section header text, a muted uppercase label on the surface.
`count (ListSection)`	`number`		Optional trailing count shown beside the section label.
`sticky (ListSection)`	`boolean`	`false`	Pin the header to the top of a scroll region; keeps the surface token under it so rows never bleed through.
`divider (ListItem)`	`boolean`	`true`	Render the hairline after the row, inset to the content column (clears the leading slot). Pass `false` on the last row of a group.

There is no NockerlList wrapper component. The container IS a LazyColumn, configured per the two ratified identities (Decision 4). These are the container-level knobs you set on it.

Parameter	Type	Default	Description
`contentPadding`	`PaddingValues`	`PaddingValues(0.dp)`	The list's outer padding. `vertical = 4.dp` for the dense tree; `horizontal = 12.dp, vertical = 8.dp` for the lifted-card list.
`verticalArrangement`	`Arrangement.Vertical`	`Arrangement.Top`	`Arrangement.spacedBy(6.dp)` for the lifted "card" list (gap between cards); omitted (0) for the dense tree where a `HorizontalDivider` separates rows instead.
`item / items` *	`LazyListScope`		Per-group emission: `groups.forEach { item(header); items(rows) }` builds section headers + rows in one tree (the `TaskTreeList` pattern).
`stickyHeader`	`LazyListScope.() -> Unit`		Pins a section header while its rows scroll. Intended for the section header; not yet adopted in-app (see drift).
`HorizontalDivider`	`@Composable`		The inter-row rule: `thickness = 1.dp, color = colors.divider` (MainScaffold). Cyan (1.5dp) is reserved for the chrome boundary, never a row divider.

SwiftUI (Voice) has no extracted list component. The container is composed inline: a ScrollView { LazyVStack(spacing: 0) { ForEach { row } } } wrapped in one elevated card, with a SectionTitle header and a per-row bottom hairline. These are the building blocks.

Style	Type	Description
`ScrollView + LazyVStack(spacing: 0)`	`View`	The scrollable list body. `spacing: 0` so rows abut and the per-row hairline (not a gap) separates them.
`SectionTitle`	`View`	The section header, a bold title above the card. Multiple sections = stacked `SectionTitle` + card pairs in the parent `ScrollView`.
`.background(chromeSurface, in: RoundedRectangle(cornerRadius: cardRadius))`	`Modifier`	The container surface (the grouped CARD). Depth lives here, not on the rows.
`.overlay(strokeBorder(hairline)) + .nockerlElevation()`	`Modifier`	The card's hairline border + lit-from-above elevation (neutral shadow + catch-light).
`Rectangle().fill(hairline).frame(height: 1)`	`View`	The inter-row hairline, applied as a bottom `.overlay` on each row. This is structure, never a per-row shadow.

Cross-platform drift (list container vs list item)

This page documents the container that arranges rows; the individual row (leading mark, primary/secondary text, trailing slot, the selected-row look) is List item. The real divergences between the shipped platforms, tracked in the Review queue:

No list wrapper anywhere: every platform hand-assembles the container. Compose configures a raw LazyColumn per identity, Voice wraps a LazyVStack in a card inline. A List / NockerlList with variant + selection + density (as the web API shows) is the open extraction item, so the container is consumed, not re-derived.
Sticky headers: the web demo and the SwiftUI-native List support sticky section headers, and Compose has stickyHeader, but no shipped screen uses it yet; section headers currently scroll with their rows. Canonizing the sticky behavior is open.
Grouped-card vs full-bleed: Voice always uses the inset grouped card; Compose’s dense tree (TaskTreeList) is full-bleed with no card. Both are valid (Decision 4), so the container must expose the choice (variant: 'card' | 'plain') rather than bake one in.
List-level selection: the one selection expression is a cyan edge bounding the run, cyan ink and a check, never a left stripe and never a wash. An earlier draft used a soft cyan wash; design law 6 (state by outline, not fill) superseded that, and the web container now carries the outline, drawing ONE edge around a contiguous run rather than a stack of them. The web container owns selection (listbox + arrow keys / multi checkboxes); Compose (today a per-row modifier background) still fills and lags here; Voice toggles expansion and has no persistent selection.