Struct FormLayout 

pub struct FormLayout { /* private fields */ }

A two-column form layout with auto-sized label column.

Children are added as label/field pairs via line() or as full-width rows via full_width(). The label column auto-sizes to the widest label; the field column takes the remaining space.

┌─ label col ─┐ gap ┌── field col ──────────────┐
│ Name:       │     │ [___________________]      │
│ Email:      │     │ [___________________]      │
├─────────────┴─────┴────────────────────────────┤
│ ── Advanced ──────────────────────────────────  │  ← full_width
├─ label col ─┐ gap ┌── field col ──────────────┐
│ Port:       │     │ [____]                     │
└─────────────┘     └────────────────────────────┘

Implementations

impl FormLayout

pub fn new() -> Self

Create an empty FormLayout with zero label gap and zero row spacing.

pub fn label_gap(self, gap: f32) -> Self

Horizontal gap between the label column and the field column.

pub fn row_spacing(self, spacing: f32) -> Self

Vertical gap between rows.

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

Set an accessible name for this form. When set, the widget emits the Role::Form landmark so assistive-technology users can navigate directly to it and distinguish it from other forms on the page. When unset, the widget demotes to a presentational GenericContainer — an unnamed landmark is worse than no landmark for AT users.

pub fn line( self, label: impl IntoTeksiChild, field: impl IntoTeksiChild, ) -> Self

Add a label/field pair row.

pub fn lines<L, F>(self, rows: impl IntoIterator<Item = (L, F)>) -> Self

where L: IntoTeksiChild, F: IntoTeksiChild,

Add several label/field pair rows from an iterator of (label, field) pairs, in order.

The loop form of line, and the usual one once the form is generated from a settings schema rather than written row by row.

pub fn line_ids( self, rows: impl IntoIterator<Item = (WidgetId, WidgetId)>, ) -> Self

Add several label/field pair rows from an iterator of (label_id, field_id) pairs, in order.

lines accepts ids in both columns too, so this is the spelling that states the id types outright rather than a capability the other method lacks. Reach for it when a loop has already registered both columns and naming the type reads better than inferring it.

pub fn full_width(self, widget: impl IntoTeksiChild) -> Self

Add a full-width row spanning both columns.

pub fn full_width_rows( self, iter: impl IntoIterator<Item = impl IntoTeksiChild>, ) -> Self

Add several full-width rows from an iterator, in order.

The loop form of full_width, for a run of banners or section headers that comes from data.

Trait Implementations

impl Debug for FormLayout

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

Formats the value using the given formatter.

impl Default for FormLayout

fn default() -> Self

Returns the “default value” for a type.

impl Widget for FormLayout

fn preserves_children_on_rebuild(&self) -> bool

Reconcile: the rows are re-attached by id, not re-derived.

line(..) with an id names widgets the caller registered itself — so there Under the default tear-down-and-reconstruct semantics build() found pending_rows already drained, re-attached the previous generation’s ids, and got a form of destroyed children: every row vanished and the widget measured zero by zero.

Reconciling is also what a form wants for its own sake. A rebuild triggered by something else on the screen — a locale switch, a Rebuild-level signal on an ancestor — must not empty the fields the user has been typing into, move focus, or reset a scrolled field.

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

Draw the widget’s visual representation.

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 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 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 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).