Module standard_item 

Canonical row layout for ListView / TreeView delegates.

Two widgets:

• StandardListItem — primary line [checkbox?] [leading_slot?] [center_slot?] [label] [Spacer] [trailing_slot?] with optional subtitle line [subtitle_leading_slot?] [subtitle] [Spacer] [subtitle_trailing_slot?].
• StandardTreeItem — same plus depth-driven indent + chevron column (always reserved, even for leaves, so labels at the same depth align).

Selection / hover / pressed background mirrors MenuItem / ComboBox: rounded RectWidget (item_corner_radius: 8.0), horizontally inset so corners are visible, theme-driven via SurfaceRole so light/dark/custom themes propagate without rebuild.

Canonical TreeView wiring

use teksilo::data::{TreeCheckedModel, TreeModel};
use teksilo::widgets::{StandardTreeItem, TreeView};

let tree: TreeModel<Item> = ...;
let checks = TreeCheckedModel::new(tree.clone());

TreeView::new_with_context(tree, move |item, entry, selected, ctx| {
    let mut row = StandardTreeItem::new(lit!(item.title.clone()))
        .from_entry(entry)
        .selected(selected)
        .leading_slot(IconWidget::from_svg(FOLDER_ICON).icon_size(16.0))
        .on_toggle_rc(ctx.toggle_callback());
    if entry.has_children {
        row = row.tristate_checkbox(checks.signal_for(entry.node_id));
    } else {
        row = row.checkbox(checks.bool_signal_for(entry.node_id));
    }
    Box::new(row)
})
.row_click_expands(false)   // chevron is the only toggle target

Wiring rules:

• TreeView::new_with_context exposes a TreeRowContext that yields toggle_callback() for chevron clicks. Pair with .row_click_expands(false) so body clicks don’t also toggle.
• For tristate parent rows, bind to signal_for(node). For leaves, prefer bool_signal_for(node) — the model’s bool ↔ tristate bridge runs ancestor recompute on writes either way.
• from_entry(&FlatEntry) is shorthand for .depth(entry.depth).has_children(entry.has_children) .is_expanded(entry.is_expanded).

Accessibility

StandardListItem.accessibility() sets the row’s name (label only) and description (subtitle, if any) — structural role + position/level/expanded/selected come from the parent’s ListItemA11y / TreeRowA11y wrapper. The embedded Checkbox receives an access_label* override carrying the row label so screen readers announce “checkbox, checked, [label]” rather than a nameless Role::CheckBox. The chevron’s TwistArrow is decorative (set_hidden); the row’s expanded state is owned by the wrapper.

Structs

StandardListItem

Canonical single-line or two-line row layout for use in a ListView.

StandardTreeItem

Canonical row layout for a TreeView — StandardListItem plus a depth-driven indent column and an always-reserved chevron column.