Struct StandardListItem 

pub struct StandardListItem { /* private fields */ }

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

See the module-level documentation for the full slot layout and wiring rules.

Implementations

impl StandardListItem

pub fn new(label: impl Into<LocalizedString>) -> Self

Create a list item with the given primary label.

pub fn style(self, style: impl StandardItemStyle) -> Self

Per-call style override. Replaces the theme-wide default StandardItemStyle for just this row instance.

pub fn subtitle(self, text: impl Into<LocalizedString>) -> Self

Set an optional secondary line below the primary label.

pub fn leading_slot(self, widget: impl Widget + 'static) -> Self

Leading slot — placed AFTER the optional checkbox, BEFORE the center slot. Typical: IconWidget, avatar, color swatch.

pub fn leading_slot_boxed(self, widget: Box<dyn Widget>) -> Self

Box<dyn Widget> variant of leading_slot.

pub fn center_slot(self, widget: impl Widget + 'static) -> Self

Center slot — placed BETWEEN the leading slot and the label. Typical: status dot, colored category bar, drag-handle gripper, key-binding chip. Distinct from leading_slot: leading is the row’s icon identity, center is label-adjacent decoration.

pub fn center_slot_boxed(self, widget: Box<dyn Widget>) -> Self

Box<dyn Widget> variant of center_slot.

pub fn trailing_slot(self, widget: impl Widget + 'static) -> Self

Trailing slot — placed AFTER the flex Spacer on the primary line. Typical: badge, count, status pill, secondary IconButton.

pub fn trailing_slot_boxed(self, widget: Box<dyn Widget>) -> Self

Box<dyn Widget> variant of trailing_slot.

pub fn subtitle_leading_slot(self, widget: impl Widget + 'static) -> Self

Leading slot for the subtitle line. No-op without subtitle(...).

pub fn subtitle_leading_slot_boxed(self, widget: Box<dyn Widget>) -> Self

Box<dyn Widget> variant of subtitle_leading_slot.

pub fn subtitle_trailing_slot(self, widget: impl Widget + 'static) -> Self

Trailing slot for the subtitle line. No-op without subtitle(...).

pub fn subtitle_trailing_slot_boxed(self, widget: Box<dyn Widget>) -> Self

Box<dyn Widget> variant of subtitle_trailing_slot.

pub fn checkbox(self, checked: Signal<bool>) -> Self

Optional two-state checkbox at the start of the row. Mutually exclusive with tristate_checkbox — last call wins.

pub fn tristate_checkbox(self, state: Signal<CheckState>) -> Self

Optional tri-state checkbox bound to Signal<CheckState>. User clicks toggle Checked ↔ Unchecked (clicking from Indeterminate checks the whole); Indeterminate is reserved for external sources such as TreeCheckedModel aggregation. Mutually exclusive with checkbox — last call wins.

pub fn on_checkbox_toggle( self, f: impl Fn(bool, &mut EventContext<'_>) + 'static, ) -> Self

Run f when the user flips this row’s checkbox, forwarded to the embedded Checkbox::on_change: same contract, same four paths, including Space on the focused row.

Reach for it only when flipping the box has to touch the ambient context (ctx.send_intent(..), opening a dialog). To read or react to check state, bind the row’s box to a CheckedModel and use that: is_checked / checked_indices / checked_count, or checked_signal() for the reactive view. The model is the source of truth and it survives the row being recycled by virtualization, which a per-row callback does not.

pub fn selected(self, selected: impl Into<Prop<bool>>) -> Self

Set the selection state, statically or reactively via a bound Signal<bool>.

pub fn enabled(self, enabled: impl Into<Prop<bool>>) -> Self

Set the enabled state, statically or reactively via a bound Signal<bool> / Prop<bool>.

pub fn label_style(self, style: impl Into<TextStyleProp>) -> Self

Override the label’s text style (font, size, weight). Accepts a TextStyleRole, a TextStyle, or a Signal of either. Default is TextStyleRole::Body.

pub fn subtitle_style(self, style: impl Into<TextStyleProp>) -> Self

Override the subtitle’s text style. Default is TextStyleRole::Small.

pub fn label_color(self, color: impl Into<ColorProp>) -> Self

Override the label’s text color. Accepts Color, a role, or a Signal of either. Default (unset) is enabled-derived (Primary / Disabled); setting this replaces that cascade.

pub fn subtitle_color(self, color: impl Into<ColorProp>) -> Self

Override the subtitle’s text color. Default (unset) is TextRole::Secondary.

pub fn interaction_signal(self, signal: Signal<InteractionState>) -> Self

Share the row’s interaction state — idle, hovered, pressed.

A row that shows its actions only while the pointer is over it is a standard pattern — a search result offering replace and dismiss, a list offering remove — and it cannot be built from outside without knowing when the row is hovered. The row already tracks that; this is the handle on it.

The signal is written by the row, not read: pass one in and watch it.

To gate revealed controls, use reveal_signal instead. This one reports hover, and hover is a mouse’s alone — a trailing slot gated on Hovered is a slot a finger can never reach.

pub fn reveal_signal(self, signal: Signal<bool>) -> Self

Whether this row’s revealed controls should be reachable, which is not the same question as whether the row is hovered.

interaction_signal reports the row’s interaction state, and a caller gating a trailing slot on Hovered has built something a finger can never reach: a contact produces no hover, ever, so the controls never appear. This signal is the same intent stated as intent, and the row answers it per density — hover while the density reveals on hover, and permanently true at a density whose [RevealPolicy] is Always, where nothing is going to hover.

Gate the slot on this, not on the interaction state, and reserve the space the controls take — the row reflows otherwise, under the pointer trying to hit them.

pub fn label_slot(self, widget: impl Widget + 'static) -> Self

Draw this instead of the label’s text, keeping the label as the row’s accessible name.

For a row whose label is not plain text: a search result with the matched run picked out of its excerpt, a diff line, anything built from runs rather than from a string. The label passed to new is still what accessibility reports, so the row keeps a name a screen reader can read — which is the whole reason this is a replacement for the drawing and not a replacement for the label.

The widget is laid out where the text would have been, so it inherits the row’s spacing and its place beside the leading and trailing slots. label_style, label_color and label_overflow do not reach it: it draws itself.

pub fn label_overflow(self, overflow: TextOverflow) -> Self

pub fn subtitle_overflow(self, overflow: TextOverflow) -> Self

Truncate the subtitle instead of wrapping it. Default (unset) is TextOverflow::Wrap.

Same rationale as label_overflow — and the usual culprit, since subtitles carry long secondary text (file paths, URLs). TextOverflow::Ellipsis(EllipsisMode::Middle) suits a path: it keeps both the root and the file name legible.

pub fn tooltip(self, text: impl Into<LocalizedString>) -> Self

Attach a plain tooltip shown after the standard hover delay.

Mutually exclusive with rich_tooltip, rich_tooltip_content, and composite_tooltip — the last setter called wins and clears the other slots.

pub fn rich_tooltip(self, key: impl Into<String>) -> Self

Attach a rich tooltip looked up from the global tooltip registry by key.

Mutually exclusive with tooltip, rich_tooltip_content, and composite_tooltip — the last setter called wins and clears the other slots.

pub fn rich_tooltip_content(self, content: TooltipContent) -> Self

Attach a rich tooltip from an inline TooltipContent value (no registry lookup required).

Mutually exclusive with tooltip, rich_tooltip, and composite_tooltip — the last setter called wins and clears the other slots.

pub fn composite_tooltip(self, content: impl Widget + 'static) -> Self

Attach a composite tooltip whose body is an arbitrary widget tree.

Mutually exclusive with tooltip, rich_tooltip, and rich_tooltip_content — the last setter called wins and clears the other slots.

Trait Implementations

impl Debug for StandardListItem

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Widget for StandardListItem

fn build(&mut self, ctx: &mut BuildContext<'_>) -> Vec<WidgetId>

Compose child widgets. Called once after the widget is placed in the arena, and again whenever the widget is marked for rebuild — a BindingLevel::Rebuild binding, rebuild_single_widget, or a density switch. A theme or locale switch does not rebuild: set_theme and set_locale mark layout + paint dirty and leave the built subtree standing, so anything derived from the theme or the locale must be read per pass or bound to a signal rather than captured here. Takes &mut self — store child IDs, signal handles, any state needed later. Returns the list of root child IDs (empty for leaf widgets).

fn layout_response( &self, proposal: SizeProposal, ctx: &LayoutContext<'_>, ) -> LayoutResponse

Respond to the parent’s size proposal with this widget’s wanted size, grow/shrink weights, and compression floor (see [LayoutResponse]).

fn place_children( &self, bounds: Rect, _proposal: SizeProposal, children: &mut [WidgetPlacement], _ctx: &LayoutContext<'_>, )

Position children within the allocated bounds.

fn accessibility(&self, builder: &mut AccessNodeBuilder)

Declare this widget’s accessibility identity.

fn children(&self) -> Vec<WidgetId>

Return the child widget IDs that this widget manages.

fn type_name(&self) -> &'static str

Concrete type name of this widget (e.g. "teksilo_widgets::button::Button"). The default implementation resolves at the impl site via std::any::type_name::<Self>(), so calls through &dyn Widget correctly dispatch to the monomorphized fn for the concrete type — getting the concrete name through the vtable without per-impl boilerplate.

fn cacheable_layout(&self) -> bool

Whether this widget’s layout_response may be memoized by the per-pass layout cache. Defaults to true.

fn paint(&self, _bounds: Rect, _canvas: &mut Canvas, _ctx: &PaintContext<'_>)

Draw the widget’s visual representation.

fn wants_after_paint(&self) -> bool

Whether this widget wants its after_paint hook to fire each frame. Returning false (the default) saves a virtual call per widget per frame for the vast majority of widgets that don’t aggregate descendant geometry.

fn after_paint(&self, _view: &WidgetTreeView<'_>, _ctx: &PaintContext<'_>)

Called once per frame after this widget’s subtree has finished painting. Receives a read-only view of the layout-resolved arena so a parent can read its descendants’ final bounds — e.g. TitleBar aggregates its drag region and control-button rects into a single HitRegions payload for the Windows backend’s WM_NCHITTEST.

fn wants_post_paint(&self) -> bool

Whether this widget wants its post_paint hook to fire each frame. Returning false (the default) saves a virtual call per widget per frame for the vast majority of widgets that don’t draw a foreground over their children.

fn post_paint( &self, _bounds: Rect, _canvas: &mut Canvas, _ctx: &PaintContext<'_>, )

Draw a foreground layer over this widget’s children.

fn wants_descendant_redirects(&self) -> bool

Whether this widget wants the AT walker to consult its a11y_redirect_descendant hook for every descendant during AT tree emission, not just its direct arena children.

fn culls_children(&self) -> bool

Whether this widget decides, on every layout pass, which of its children exist at all.

fn a11y_redirect_descendant( &self, _self_id: WidgetId, _descendant: WidgetId, ) -> Option<NodeId>

Optional redirection hook for AT-tree placement of a child.

fn accessible_title_hint(&self) -> Option<String>

Suggest an accessible title to an enclosing container that wraps this widget as content — typically a modal / dialog shell that wants to propagate the inner content’s visible title as the shell’s own accessible name.

fn accessible_title_node(&self) -> Option<WidgetId>

The widget that paints this one’s title, when it has one.

fn initial_focus_hint(&self) -> Option<WidgetId>

Optional hint that directs initial focus to a specific descendant when this widget is the root of a deferred-built modal surface.

fn accessibility_proxy(&self) -> Option<WidgetId>

The descendant whose accessibility node stands for this widget.

fn context_menu_key_target(&self) -> Option<WidgetId>

Which descendant a keyboard request for a context menu should target.

fn accessibility_children(&self) -> Option<Vec<WidgetId>>

Optional override for the child ORDER presented to assistive technology, when it must differ from the paint / z-order child order returned by children.

fn as_any(&self) -> Option<&(dyn Any + 'static)>

Downcast hook. Default implementation returns None; concrete widgets override with Some(self) when they want to expose their concrete type to test-level introspection or reflection. The trait already bounds on std::any::Any so concrete types satisfy the 'static requirement.

fn as_any_mut(&mut self) -> Option<&mut (dyn Any + 'static)>

Mutable counterpart of as_any. Default returns None; widgets that want to expose mutable state to tests (e.g. so a test can mutate a Scene inside a SceneView post-layout) override with Some(self). Should follow the same opt-in pattern as as_any: only widgets that opt into & introspection should opt into &mut.

fn clips_children(&self) -> bool

Whether this widget clips its children to its bounds.

fn focus_reveal_rect(&self, _bounds: Rect) -> Option<Rect>

The rectangle (in absolute tree coordinates) that best represents this widget when the framework reveals it into an ancestor scroll area on focus gain. Returning None (the default) reveals the widget’s whole bounds — correct for most controls.

fn hit_shape(&self, _local_point: Point, _bounds: Rect) -> bool

Whether the point lies inside this widget’s actual shape, not just its rectangular bounds. Consulted by hit-testing right after the bounds check: returning false for a point that is inside the bounding box makes the widget transparent to the click there, so it falls through to whatever sibling is painted underneath (the same machinery as a fully pass-through node, but shape-aware).

fn accepts_child_hit(&self, _child: WidgetId, _point: Point) -> bool

Veto a hit on one of this widget’s direct children, per point.

fn hit_outset(&self, _kind: PointerKind, _tokens: &InputTokens) -> EdgeInsets

How far outside its own bounds this widget still absorbs a press, per edge, for the pointer that is asking.

fn hit_slop(&self, _kind: PointerKind, _tokens: &InputTokens) -> Option<HitSlop>

This widget’s own say in the miss-only slop pass, overriding the density default for its node.

fn hit_distance(&self, local_point: Point, bounds: Rect) -> Option<f32>

How far a missed press is from this widget’s actual silhouette, in the widget’s own bounds space.

fn target_regions(&self, _bounds: Rect) -> Vec<TargetRegion>

The interactive sub-regions this widget paints inside its own single node — a scroll bar’s thumb, a slider’s knob, a header cell’s filter affordance.

fn preserves_children_on_rebuild(&self) -> bool

How rebuild_single_widget treats this widget’s existing children when re-running its build().

fn tooltip_has_content(&self) -> bool

Whether this widget, used as tooltip content, currently has anything worth showing.

fn declare_shortcuts(&self) -> Vec<Shortcut>

Declare the rebindable keyboard shortcuts this widget exposes, without installing handlers. The framework calls this at arena insertion time (before build()) and at certain lazy boundaries (e.g. Switcher walks declarations on its not-yet-mounted Pending slots), so settings UIs and the ShortcutRegistry see the keystrokes the moment the owning container mounts — even if build() hasn’t run.

fn take_handler_set(&mut self) -> Option<HandlerSet>

Extract attached handler set from a WidgetWithHandlers wrapper. Called during arena insertion to transfer handlers to the WidgetNode. Default: returns None (no attached handlers).