Struct ActionPalette 

pub struct ActionPalette { /* private fields */ }

The unified Ctrl+K palette: a SearchField over a SearchResultsView, fed by the focused app’s resource/action tree plus any folded-in SearchProviders.

Implementations

impl ActionPalette

pub fn empty_text(&self) -> &str

What the empty result list says now, as a person reads it.

pub fn empty_hint(&self) -> Option<&str>

What the empty result list says to try instead, under that line; None while it says nothing more.

impl ActionPalette

pub fn rows(entries: Vec<CommandEntry>) -> ActionPalette

A palette over rows a host feeds itself, rather than over an app’s published actions.

pub fn set_entries(&mut self, entries: Vec<CommandEntry>)

Replace the rows the host searched. The first is selected.

pub fn visible_entries(&self) -> Vec<&CommandEntry>

The rows the host fed that the list is showing, in order.

pub fn take_outcome(&mut self) -> Option<CommandOutcome>

The chosen row, with the value it asked for if it asked. Drained by the host after it handled input.

pub fn take_adjustment(&mut self) -> Option<(String, i8)>

The step ←/→ asked of the selected adjustable row since the last call: its id and the direction (-1 or 1). The host changes the value and refreshes the row.

pub fn take_submitted_argument(&mut self) -> Option<String>

The value a host step was confirmed with, once.

pub fn take_argument_cancelled(&mut self) -> bool

Whether a host step was backed out of since the last call.

pub fn open_argument_step(&mut self, id: impl Into<String>, spec: ArgumentSpec)

Ask for one value in the field, for a host that collects an action’s arguments one step at a time. The list stays where it is underneath. Enter hands the value to Self::take_submitted_argument and Escape sets Self::take_argument_cancelled; the host decides what follows. Neither runs a row, so a step can’t stand in for one.

pub fn cancel_host_step(&mut self)

Leave any host step without running or reporting anything: the host has moved on (to another step, or back to the results).

pub fn argument_buffer(&self) -> Option<&str>

The value the open step’s field holds.

pub fn set_scope_token(&mut self, token: Option<String>)

Show token at the start of the field: the part of the source the query is narrowed to, removable with Backspace.

pub fn set_scope_token_action(&mut self, action: Option<String>)

What pressing the token does, when it is a control: its accessible name. None: Backspace alone removes it.

pub fn scope_token(&self) -> Option<&str>

The token the field shows, when one is set.

pub fn scope_token_action(&self) -> Option<&str>

What pressing the token does, when it is a control.

pub fn take_scope_token_removed(&mut self) -> bool

Whether Backspace at the start of the field took the token away since the last call: the host widens the search.

pub fn set_field_only_while_empty(&mut self, on: bool)

Show the query field alone while nothing is typed: no list and no band, the card a single row until the person types.

pub fn shows_field_only(&self) -> bool

Whether the card shows its field alone right now.

pub fn filter_band_shown(&self) -> bool

Whether the card reserves its band of host-painted controls right now.

pub fn set_filter_band_shown(&mut self, shown: bool) -> bool

Show or hide the band. A host hides it until the results have something to tell apart, so it isn’t standing chrome over every search. Returns whether that changed.

pub fn filter_strip_rect(&self) -> Rect

The band the host paints its own controls into.

pub fn filter_strip_row_height(&self) -> f64

One band row’s height, for a host spacing its controls by it.

pub fn set_max_list_height(&mut self, height: f64)

The tallest the result list may grow before it scrolls, in logical pixels. The host sets it from the display it shows the palette on.

pub fn set_max_width(&mut self, width: Option<f64>)

The width the card takes, in logical pixels: the host sets it from the room it shows the palette in, so the card follows the window or the display rather than its own size. None leaves it its own width.

pub fn text_scale(&self) -> f64

The text scale layout and host-painted controls share.

pub fn set_query_placeholder(&mut self, placeholder: impl Into<String>)

Replace the placeholder the field shows while a step is not using it.

pub fn set_searching(&mut self, searching: bool)

Whether more results are still on their way (an index whose code is still loading): an empty list then says “Searching…” instead of “No results”.

pub fn set_bypass_fuzzy(&mut self, on: bool)

Every row the host fed shows unless the host lets the palette narrow by the query. A host doing its own matching turns narrowing off, so hits whose labels don’t literally spell the query aren’t hidden by fuzzy scoring.

pub fn set_held_modifiers(&mut self, held: ModifiersState) -> bool

Tell the palette which modifiers are down, for a host that routes modifier changes itself.

pub fn held_modifier(&self) -> Option<ActivationModifier>

The modifiers held now that name one of a row’s alternatives.

pub fn set_host_facets(&mut self, facets: Vec<Facet>)

The chips a host feeding its own rows offers above them: it declared the facets, so it is the one that can narrow its rows by what is picked (Self::picked_filters). Unlike the facets an app’s own rows declare, these are the host’s whole list: what it stops offering is no longer a chip.

pub fn picked_filters(&self) -> &[FacetFilter]

The chips picked among a host’s facets: what its rows are narrowed by, as the host reads it to feed the ones that match.

pub fn selected_id(&self) -> Option<&str>

The selected row’s id; None while nothing is shown.

pub fn set_selected_status( &mut self, badge: impl Into<String>, description: impl Into<String>, )

Show host feedback on the selected row using the shared status pill and description, keeping the query, the order and the selection so an unsuccessful invocation can be corrected or retried.

pub fn row_rect(&self, i: usize) -> Option<Rect>

The row i of the list, in window coordinates; None when it is scrolled out of view.

pub fn header_at(&self, p: Point) -> Option<String>

The group header at p, if one is there.

pub fn row_at(&self, p: Point) -> Option<usize>

The row at p, if one is there.

pub fn input_row_rect(&self) -> Rect

The field’s row, inside the card’s padding.

pub fn set_rect(&mut self, rect: Rect)

Hand the card a rect, for a host that positions its overlays itself.

pub fn desired_size(&self) -> (f64, f64)

The size the card asks for: the rows it holds, up to the tallest list the host allows.

pub fn chrome_height(&self) -> f64

The card’s height less its result list: the field, the band and the padding around them.

pub fn entry_row_capacity(&self) -> usize

How many result rows a full list holds: what a host asks its sources for, so the first screen is full.

pub fn entry_row_capacity_with(&self, groups: usize) -> usize

How many result rows a full list holds under the headers of groups groups: a header takes room a row would have held, so a list with four groups holds fewer rows than one with two.

pub fn entry_row_capacity_for(&self, groups: usize, two_line: bool) -> usize

How many rows a full list holds under the headers of groups groups when its rows are two_line tall: for the rows a query is about to put there, which the palette does not hold yet.

pub fn entries_fit(&self, entries: &[CommandEntry], groups: usize) -> bool

Whether the rows entries stand inside the list, under the headers of groups groups: every line at its own band, against the cap the card gives its rows. A list that holds more is cut at the card’s edge, so a host asks this before it hands its rows over.

pub fn handle_list_key(&mut self, key: &Key, shift: bool, ctrl: bool) -> bool

Moves through the results; true when the key moved the selection or belonged to the list.

impl ActionPalette

pub fn result_labels(&self) -> Vec<String>

The labels currently shown, in display order (for tests / diagnostics).

pub fn result_rows(&self) -> Vec<(String, Option<String>)>

The rows currently shown as a person reads them, label and the line under it, in display order (for tests / diagnostics).

pub fn result_hits(&self) -> Vec<SearchResult>

The rows currently shown as the list paints them, in display order: their titles, underlines, pictures and shortcuts (for tests and diagnostics).

impl ActionPalette

pub fn place_in(&mut self, window: Rect, theme: &Theme) -> (Point, f64)

Stand in window, the part of the app’s window under its bar: the card where placement puts it, the modal scrim over the rest of window, and the bar left clear and live. Returns the card’s origin and width for Self::layout.

pub fn scrim_rect(&self) -> Option<Rect>

The scrim the palette dims its window with, while it is shown.

impl ActionPalette

pub fn asking(&self) -> Option<(&ActionAddress, &str)>

The action the palette is asking the person to confirm, and the question it asks, while it asks.

pub fn confirming_target(&self) -> Option<String>

The published semantic target of the question’s own action button (named for the verb it confirms), while the palette asks. Activating it goes ahead, as the person’s click or assistive technology does; a destructive question starts on Cancel, so Enter never confirms it.

pub fn asking_why(&self) -> Option<&str>

Why the palette asks, when the workspace’s grants ask rather than the action itself: who decides, said to the person asked.

pub fn new() -> ActionPalette

A closed palette. Load resources / providers, then open.

pub fn with_text_renderer(renderer: TextRenderer) -> ActionPalette

A closed palette that owns an explicitly configured layout renderer.

pub fn load_open_resources(&mut self, resources: &[ResourceSpec])

Populate from the focused instance’s open-resource forest. Each exported action becomes an Actions row; rebuilds the result set + index.

pub fn refresh_open_resources(&mut self, resources: &[ResourceSpec])

Replace only the authority snapshot, without moving the visible result rows or cursor. The host calls this immediately before handling input; a selected row can then disappear/refuse safely instead of changing the user’s selection to a different action during the same key press.

pub fn refresh_visible_resources(&mut self, resources: &[ResourceSpec])

Refresh displayed authority asynchronously without moving an existing selection onto a different control. Argument/confirmation fields retain their original address; dispatch still rechecks the fresh authority.

pub fn referenced_action_resource_ids(&self) -> Vec<String>

Resource ids referenced by the current canonical search rows.

The host uses these inert ids to resolve lazy resources through the owning widget. Providers deliberately cannot supply authority.

pub fn set_ambient_context(&mut self, context: Option<ActionContext>)

pub fn set_providers(&mut self, providers: Vec<Box<dyn SearchProvider>>)

Fold in searchable-content sources. Canonically addressed hits dispatch through the resource/action path; legacy opaque hits remain navigable.

pub fn is_open(&self) -> bool

pub fn open(&mut self)

pub fn set_scope(&mut self, scope: Option<ScopeDecl>)

Narrow the palette to one part of the app, or widen it to the whole app with None. The field shows the scope as a removable token.

pub fn scope(&self) -> Option<&ScopeDecl>

The part of the app the palette is narrowed to.

pub fn select_query(&mut self)

Select the query, so typing replaces a pre-filled search.

pub fn facets(&self) -> &[Facet]

The facets the providers declared, offered as chips.

pub fn search_query(&self) -> &SearchQuery

The query providers receive, with its parsed filters and scope.

pub fn toggle_facet(&mut self, filter: &FacetFilter)

Pick or unpick a facet value, as clicking its chip does. A value that was typed as a key:value token is removed from the text.

pub fn close(&mut self)

pub fn query(&self) -> &str

pub fn set_query(&mut self, q: &str)

Set the query programmatically and rebuild the result set (for tests / hand-off from another surface).

While the palette asks for a name to be typed, this is what stands in its plain field instead: it searches nothing.

pub fn query_field(&self, key: &[u8; 32]) -> Option<QueryField>

The palette’s query field while it takes typing, as text committed from outside the keyboard may write into it: the field a dictation binds before it listens. None while the palette is closed, while something else on it takes the keyboard, and while an input method composes.

pub fn commit_query_text(&mut self, text: &str) -> bool

Write committed text (an input method’s, or a dictation’s) into the query field at the caret, as the input method’s commit does, and search what it now holds. Returns whether the field took the text: it does not while it asks for a typed name, takes a secret, or is not focused.

pub fn len(&self) -> usize

pub fn is_empty(&self) -> bool

pub fn advance_search_page(&mut self) -> SearchAdvance

Advance one bounded query page or one finite retained-validation step. A completed-query external redraw may start a fresh validation pass; its final step returns pending=false so it never schedules another pass.

pub fn take_search_announcement(&mut self) -> Option<String>

Drain the polite live-region text produced by progressive search.

pub fn set_cursor(&mut self, index: usize)

Move the highlight to a flat row index (clamped).

pub fn select_resource(&mut self, resource: &str) -> bool

Put the row that acts on resource under the cursor, so pressing Enter acts on it: what a search opened on a resource of the app’s does (SearchRequest::on). A row of it, else a row inside it (its item view); false when the search lists none, which leaves the palette as it was.

pub fn cursor(&self) -> usize

The highlighted flat row index.

pub fn in_argument_mode(&self) -> bool

pub fn activate_selected(&mut self)

Activate the highlighted row, exactly as pressing Enter would.

pub fn activate_address(&mut self, resource: &str, action: &str) -> bool

Enter the argument/confirmation flow for an exact domain address. Used by accessibility activation so consequential resource nodes cannot jump around the palette’s policy flow.

pub fn take_operation(&mut self) -> Option<PendingOperation>

Drain the resolved operation without assuming it is a document edit. The application host uses this to route effects/views to the owning widget and document operations to the deterministic executor.

pub fn take_navigation(&mut self) -> Option<String>

Drain a completed content activation: the opaque action_id of the chosen search-provider row, for the app to navigate to.

pub fn layout(&mut self, theme: &Theme, origin: Point, width: f64)

Position the palette at origin with width. Called each frame before draw.

Panics

Internal host-text palettes must use layout_with_text with their owning renderer.

pub fn rect(&self) -> Rect

The palette’s outer rect after the last layout.

pub fn draw( &mut self, scene: &mut Scene, transform: Affine, text_renderer: &mut TextRenderer, theme: &Theme, presence: &PresenceCtx, )

Draw the field + results overlay. layout must have run this frame.

pub fn handle_key( &mut self, event: &WindowEvent, modifiers: &Modifiers, doc: &mut Edits<'_>, path: &ExId, ) -> bool

Feed a keyboard event to the open palette; returns whether consumed. While open, the palette is modal: it swallows every key so nothing leaks to the app behind it.

Trait Implementations

impl Default for ActionPalette

fn default() -> ActionPalette

Returns the “default value” for a type.

impl Widget for ActionPalette

fn test_id(&self) -> Option<&str>

The registry key a host resolves the card by: the query field’s rect, as the shell’s overlay hosts look the search card up.

fn is_layout_dirty(&self) -> bool

Sized by its style alone: nothing a host row changes needs taffy to measure it again.

fn needs_redraw(&self) -> bool

Default false (clean). A widget is clean until something it reads changes: a leaf that keeps state says so by tracking a dirty: bool (set in handle_event/sync, cleared in mark_drawn()), and one that paints from the people on the document reads the frame’s presence (crate::presence::frame::frame). Containers MUST forward: dirty iff any descendant is.

fn mark_drawn(&mut self)

Called after this widget’s scene lands in the composed frame, to clear a dirty flag. Default forwards to children.

fn name(&self) -> &str

fn is_focusable(&self) -> bool

fn is_focused(&self) -> bool

fn set_focus(&mut self, focused: bool)

fn traps_focus(&self) -> bool

While any widget answers true, the host restricts Tab/directional focus to this subtree (wrapping at the ends) and restores the prior focus once it goes back to false. Default false.

fn modal_capture(&self) -> Option<Rect>

Some(rect) when this subtree holds an open modal, its panel box. While any widget reports Some, the host suppresses its own global focus shortcuts and swallows unhandled pointer presses so nothing behind the modal is clickable. Containers MUST forward (the default does, via first Some among children).

fn build_layout( &mut self, tree: &mut TaffyTree, theme: &Theme, nodes: &mut HashMap<NodeId, *mut dyn Widget>, ) -> NodeId

fn apply_layout(&mut self, tree: &TaffyTree, node: NodeId, origin: Point)

Take the geometry layout gave this node. The default keeps none, for widgets that neither draw nor hit-test.

fn take_structure_dirty(&mut self) -> bool

True if this subtree’s structural composition changed since the last frame; reading clears it. The default drains every retained child and reports whether any was dirty.

fn set_platform_conventions(&mut self, conventions: PlatformConventions)

Receive host-selected platform conventions. The default propagates to retained children, keeping target-OS branches out of app code.

fn get_rect(&self) -> Rect

The rectangle this widget occupies. The default, for widgets that keep no geometry, is empty.

fn draw( &mut self, scene: &mut Scene, transform: Affine, text: &mut TextRenderer, theme: &Theme, presence: &PresenceCtx, )

Paint into scene. The default paints nothing.

fn handle_event(&mut self, event: &WindowEvent, ctx: &mut EventCtx<'_>)

Handle one input event with the runtime services for this retained node.

fn cursor_shape(&self, point: Point) -> Option<CursorIcon>

point is logical coords, same space as Widget::get_rect; None defers to the default arrow. The host hit-tests the whole tree via node_map and picks the smallest-area claim, so containers need not override this.

fn ime_cursor_rect(&self) -> Option<Rect>

Caret rectangle for the platform input method, in window-logical coordinates. Returning Some enables IME for the focused widget and positions its candidate window; non-text controls keep the default None and therefore disable IME.

fn ime_content(&self) -> Option<InputContent>

The focused widget wants platform text input (Wayland text-input-v3, native IMEs elsewhere). None is intentionally the default: enabling an IME for buttons, canvas tools or games makes the compositor raise an on-screen keyboard over content that cannot accept the committed text.

fn ime_edit_fingerprint(&self, key: &[u8; 32]) -> Option<[u8; 32]>

Opaque local invalidation of deferred input, including selection edits that leave the caret rectangle unchanged. The host supplies an ephemeral secret key; no text or selection is retained in the resulting digest. The default shares the accessibility door and excludes protected or read-only controls. Text controls can override it to avoid cloning text.

fn accessibility_hidden(&self) -> bool

Whether Self::accessibility reports this subtree hidden, for a host that asks it of every node to prune focus traversal. Widgets whose node is costly to build (text values, per-block children, a translated name) answer without building it: the focus walk asks every widget in the window on every recomputation. Any override must agree with accessibility(); debug builds check it in the walk.

fn synthetic_accessibility_rect(&self, path: &[usize]) -> Option<Rect>

Geometry for an immediate-mode semantic child from AccessNode::children. The path is its child-index path beneath this widget’s accessibility node. Returning a rect lets AccessKit activation inject the same click as pointer input.

fn focus_synthetic_accessibility(&mut self, path: &[usize]) -> bool

Move this widget’s own immediate-mode focus to a synthetic semantic child. Retained widgets continue to use the ordinary taffy focus path.

fn accessibility(&self) -> Option<AccessNode>

Role, name/description/value, and AccessState. Default None means presentational: the node is skipped and children reparent onto the parent. State must be derived, not stored so it can’t drift from draw; names must already be i18n!-resolved.

fn perform_semantic_action( &mut self, target: &str, action: &Action, doc: &mut Edits<'_>, path: &(dyn Any + 'static), ) -> bool

Handle an action addressed to a synthetic accessibility child created by this widget. target is the opaque stable value supplied through AccessNode::with_action_target.

fn native_input_snapshot( &self, _state: &(dyn Any + 'static), _path: &(dyn Any + 'static), ) -> Option<Value>

Read-only state evidence for opt-in scheduled native input diagnostics. Called only around diagnostic inputs, never during ordinary input or paint. Keep this inexpensive and root-local; snapshots may be logged verbatim. This verifies widget state, not rendered pixels or display presentation.

fn view_only_scroll(&self, _event: &WindowEvent) -> bool

Opt in only when this wheel event changes scroll geometry and nothing else: no document edit, focus or selection, action availability, resource declaration, pending command or work that requires sync. The runner still lays out, paints and refreshes accessibility geometry; unknown handlers stay on the full path.

fn primary_vertical_scroll(&self) -> Option<PrimaryScrollRegion>

Explicit app-owned region; never search secondary children implicitly.

fn apply_primary_vertical_scroll( &mut self, _action: PrimaryScrollAction, ) -> PrimaryScrollResult

fn callback_binding(&self) -> Option<CallbackBinding>

Runtime binding inherited by descendants in a matching layout topology.

fn has_separate_document_owner(&self) -> bool

Whether this widget introduces a document owner distinct from the runner’s outer State. This is a compatibility check, never identity or authority for history access or restore.

fn history_owner(&self) -> Option<HistoryOwner>

Opaque actual custody for framework History source registration.

fn record_owners(&self) -> Vec<HistoryOwner>

Records this widget keeps open beside the document it shows, each synced on its own route: a framework app’s records in the person’s own workspace (crate::record::person). They take no part in this widget’s history or controls.

fn provide<'a>(&'a self, _request: &mut Request<'a, '_>)

Answer a request for a capability this widget takes part in (see capability). Declare capabilities with crate::provides!.

fn provide_mut<'a>(&'a mut self, _request: &mut RequestMut<'a, '_>)

Exclusive counterpart to Widget::provide.

fn mount_native_views(&mut self, host: &NativeViewHost<'_>)

Attach native child views through this owner’s retained lifecycle topology. Presentation containers with inactive or hidden live descendants override this traversal so lifecycle ownership stays independent of drawing and input visibility.

fn unmount_native_views(&mut self)

Tear native children down while their parent window still exists.

fn native_view_frame_start(&mut self)

Begin a native-view frame through this owner’s retained lifecycle topology.

fn set_interaction_environment(&mut self, environment: InteractionEnvironment)

Receive the host’s current input capabilities. The default propagates through retained containers, so app code does not need device branches.

fn set_window_bar_control(&mut self, in_bar: bool)

Tell this widget whether it stands in a window bar. A bar’s controls are drawn at the bar’s control height whatever the pointer; the target a finger needs reaches beyond the drawn shape, invisibly. The default propagates to children.

fn sync(&mut self, state: &(dyn Any + 'static), path: &(dyn Any + 'static))

Pull model state into this widget before layout. The default syncs the children Widget::children_mut returns; a widget overrides it only to read state of its own, or to sync children it does not expose there.

fn update( &mut self, state: &(dyn Any + 'static), path: &(dyn Any + 'static), ) -> bool

Notice, between frames, state outside the document (a chrome revision, a momentum scroll still ticking) and report whether anything changed. The default updates every child Widget::children_mut returns without short-circuiting, so a container never freezes its descendants; an override checks state of its own and forwards.

fn settle(&mut self, edits: &mut Edits<'_>, path: &ExId)

Apply, after the sync pass, what the widget took up there and must write: a worker’s answer, a chooser’s file, an event a child queued. Writes go only through typed actions on edits; the host syncs again when the document changed. The default settles the returned children.

fn measure( &mut self, _known: Size<Option<f32>>, _available: Size<AvailableSpace>, _text_renderer: &mut TextRenderer, ) -> Size<f32>

fn layout_info(&self) -> Option<LayoutInfo>

Read-only resolved decisions for widgets with an explicit layout policy. None means the widget has no such policy; ordinary manual widgets remain valid. Values are available after build/settlement and carry real origins.

fn adjust_layout_style( &mut self, _taffy: &mut TaffyTree, _node: NodeId, _text: &mut TextRenderer, ) -> bool

Adjust this node’s style using its allocated size, before final geometry is applied. Return true only when the style changed (or an inherited decision child hooks read). An override may measure its owned children through ordinary references, entering their callback binding when present. Never reenter descendants through the raw node map while borrowing their parent, change topology, or build another layout tree. The shared host solver visits every registered widget, repeats layout at most eight times and skips a frame that does not settle.

fn observe_physical_input(&mut self, _input: PhysicalInput)

Observe this app’s ordinary foreground physical input before framework shortcuts consume it. Keep feedback ephemeral; this is not an input grant.

fn children(&self) -> Vec<&dyn Widget>

fn for_each_child(&self, visitor: &mut dyn FnMut(&dyn Widget))

Allocation-free read-only child traversal. Existing custom containers inherit a compatibility adapter over Self::children; toolkit containers override this to walk their retained storage directly.

fn for_each_child_in_clip(&self, visitor: &mut dyn FnMut(&dyn Widget))

The children of Self::for_each_child that may paint inside the layout_clip in effect: what a scroll view’s damage and copy plan need. Every child by default; a long column visits only those near the clip, so a frame costs what is shown, not what the column holds.

fn for_each_hosted_child(&self, _visitor: &mut dyn FnMut(&dyn Widget))

Children this widget keeps in the retained tree but does not route input to: a subtree it does not own and answers the person’s events for itself, like a host drawing another widget’s card over the windows. Inspection, named controls and the accessibility tree walk these after the children Self::children lists, so what is walked there keeps the paths, sibling indices and registry entries it had.

fn for_each_layout_child(&self, _visitor: &mut dyn FnMut(&dyn Widget)) -> bool

Every child this widget’s Self::build_layout gives a layout node, also those Self::for_each_child keeps from routing (a hidden pane, a title, a spacer). A retained layout is checked against this walk before it is called through again, so a widget that replaced a child without reporting it gets a new layout instead of a call into freed memory. A child missing here cannot be checked, so debug builds stop on it. A wrapper that stands for its inner widget’s node visits the inner widget itself.

fn children_mut(&mut self) -> Vec<&mut dyn Widget>

fn window_slot(&self, _id: String) -> Option<ToolbarAction>

This control as an action of the window’s bar, sent back as id (crate::window_toolbar::ToolbarAction): a button’s icon and name. None for anything that is not a button.

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

Downcast to the concrete widget, for hosts and tests that reach a known widget through dyn Widget. Default None (a widget may borrow and so not be 'static); a widget opts in with Some(self), and a Decorator answers itself.

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

fn stands_for(&self, address: *const ()) -> bool

Whether this widget is the one at address, or stands in the tree for it: a Decorator stands for every widget it wraps, so a scroller drawn inside one is found where the decorator is (crate::scroll_copy::offer).

fn focus_reveal_context(&self) -> Option<Rect>

Context that should remain visible with a focused descendant, such as a form control and its validation message. Opt-in scroll containers use this block when it fits; otherwise they prioritise the control.

fn reveal_descendant(&mut self, target: *const dyn Widget) -> bool

Reveal a newly keyboard-focused descendant inside any enclosing viewport. Containers override this to scroll; ordinary widgets simply recurse toward the target and report whether it was found.

fn test_rects(&self) -> Vec<(String, Rect)>

Named hit rects for widgets that paint several affordances into one rect instead of composing children. Same space as Widget::get_rect; zero-area entries are dropped.

fn child_clip_rect(&self) -> Option<Rect>

Absolute logical clip applied to ordinary children during painting and pointer routing. Inspectors and enclosing scroll regions must respect this boundary instead of treating clipped descendants as visible extent.

fn snap_points(&self, axis: ScrollAxis, out: &mut Vec<f32>)

Offsets along axis that this widget, as a scroll view’s content, offers it to settle on, measured from its own leading edge: a board’s lanes (crate::widget::Board). None leaves a scroller stopping wherever the hand left it.

fn take_action_palette_request(&mut self) -> Option<ActionAddress>

One-shot request to open the host’s action palette directly at a typed resource action. Parameter collection and permission checks remain host policy; widgets only name an address already present in resources().

fn take_search_request(&mut self) -> bool

One-shot request to open the host’s search palette, the same one the platform search shortcut opens. An app’s own search button latches it so search stays one shared host surface rather than an app overlay.

fn claims_raw_touch(&self, _point: Point) -> bool

Opt out of touch-to-pointer emulation for contacts that begin at point (logical coords, same space as Widget::get_rect).

fn touch_claim(&self, _point: Point) -> TouchClaim

What a one-finger contact that begins at point (logical coords) means here, when a drag moves something rather than scrolling.

fn tooltip(&self) -> Option<&str>

Revealed after a dwell over the widget’s rect, via the toolkit’s one tooltip mechanism (crate::widget::tooltip::TooltipHost), hit-tested like cursor_shape so containers need not forward it. An icon-only control should also use this as its accessible name.

fn tooltip_side(&self) -> TooltipSide

Which side of the control its tooltip goes: below by default, beside it for a control in a vertical rail.

fn tooltip_target_at(&self, point: Point) -> Option<(Rect, String)>

fn is_default_keyboard_focus(&self) -> bool

Preferred control when its app is explicitly activated without a valid saved control. Hosts still enforce visibility, enabled state and scope.

fn keyboard_input_scope(&self) -> Option<u64>

Exact app instance whose non-text shortcuts this subtree owns when activation has no control target. Unbound desktop chrome may declare the active tab; component boundaries default to their captured owner.

fn set_full_bleed(&mut self, _full_bleed: bool)

The window holding this content fills its display (a maximized window): it has nothing beside it to round its corners against or to set it apart from, so content that frames or clips itself to the window’s shape draws edge to edge instead. A client surface drawn that way, last and unclipped, is one the display can scan out directly. Content that frames nothing ignores it.

fn set_invalid(&mut self, _invalid: bool)

The form’s validation verdict for this control, set by Field::with_error: an invalid control edges itself in danger ink and reports invalid to assistive technology. Controls without a field face ignore it.

fn focus_requested(&mut self, target: Option<NodeId>, tree: &TaffyTree)

An explicit runner focus request, after resolving the actual keyboard owner. Retained flags and layout restoration are not user gestures. Containers can observe this to reveal the owning viewport.

fn context_menu_anchor(&self) -> Option<Rect>

The box a context menu opened from the keyboard stands against: the item that has the keyboard, so the menu opens under it rather than under the whole widget. A widget that holds items (a list) answers for the one with the keyboard; None leaves the menu to stand under the focused widget’s own box.

fn wants_tab_input(&self) -> bool

Whether a focused widget owns Tab instead of the host’s focus traversal. This is deliberately opt-in: ordinary form fields and controls retain platform-standard Tab/Shift+Tab navigation, while a code editor or terminal can receive the key for indentation or completion. A widget around the focus may claim it too: a sheet that walks its own controls with Tab.

fn scopes_keyboard_focus(&self) -> bool

Whether Tab and directional focus travel stay inside this subtree while no trap holds focus: the content of the focused desktop window, so keyboard travel cycles through the app the person is in and never wanders onto the desktop’s chrome (its bars, menus and window titles), which the keyboard reaches through its own shortcuts. Unlike Self::traps_focus it moves no focus when it starts or ends, and pointer input is unaffected. Default false.

fn take_app_activation(&mut self) -> Option<u64>

One-shot (reading MUST clear it): the app instance the person just brought forward (a window they opened, clicked or switched to), whose keyboard focus the host restores, or puts on its default control, so what they type next reaches it. Default forwards the first request found among the children.

fn take_focus_request(&mut self) -> Option<String>

One-shot (reading MUST clear it): the test id of the control this subtree asks to take the keyboard once the runner laid it out, such as the first field of a view a person’s press just opened, so what they type next lands there. The runner focuses it as a press focuses a control, blurring any other; a control it does not find (or that takes no focus) leaves focus where it is. Default forwards the first request found among the children.

fn accessibility_shared(&self) -> Option<SharedAccessNode>

Self::accessibility with its synthetic children shared, for a widget that keeps them between frames: each child it did not change is handed over as the very Arc of the last frame, which the semantic tree takes as unchanged without copying or comparing it.

fn accessibility_root(&self) -> Option<AccessNode>

Self::accessibility’s own node with its children left empty: its role, identity (semantic_key) and state. Focus capture and focus order read only these, for every node on every frame, so a widget whose node carries a large subtree (a document exporting its every block) answers without building it. An override must equal accessibility() with children cleared.

fn accessibility_child_parent(&self, _child_index: usize) -> Option<usize>

Reparent one retained children entry beneath a synthetic child returned by accessibility. The returned index addresses AccessNode::children for this frame. Collections use this to place a real interactive row delegate inside its virtual ListItem/TreeItem instead of exporting a duplicate.

fn accessibility_child_path(&self, child_index: usize) -> Option<Vec<usize>>

Reparent one retained children entry beneath a nested path of synthetic children returned by accessibility.

fn accessibility_represents_child(&self, _child_index: usize) -> bool

Whether one retained children entry is already represented in this widget’s own synthetic accessibility tree, so the bridge must not export it a second time. A host that publishes a child’s semantics itself (to add its own controls inside the same dialog) answers true for that child; assistive technology then sees one copy, not two.

fn lays_out_child(&self, _child_index: usize) -> bool

Whether this widget lays one retained children entry out itself (an Embedded part of a painted page) rather than through the window’s layout, which then gives it no node. The accessibility walk reaches such a child, and every widget inside it, through this widget’s node.

fn accessibility_child_description(&self, _child_index: usize) -> Option<String>

What describes one retained children entry to assistive technology, when this widget holds the words for it: a row’s secondary line is its trailing switch’s description. The bridge sets it as that child’s node’s description unless the child describes itself.

fn perform_action( &mut self, _action: &Action, _key_path: &[u64], _state: &mut Edits<'_>, _path: &(dyn Any + 'static), ) -> bool

Perform an accessibility Action on this widget, or on one of its synthetic accessibility nodes. May mutate the CRDT like handle_event.

fn is_enabled(&self) -> bool

A disabled (false) widget is excluded from focus traversal, must reject input in handle_event, and renders dimmed (see DISABLED_ALPHA).

fn ime_requires_deferred_ack(&self) -> bool

This field needs a host that consumes deferred receipts. Ordinary native Wayland windows must not advertise it until they have that delivery path.

fn ime_refuses_ordinary_commits(&self) -> bool

Ordinary input-method commits (a composing keyboard IME, the on-screen keyboard) cannot reach this field: its text arrives only through deferred receipts (a browser page field), so hosts keep standard text input closed outside a dictation session. A field that needs deferred receipts for dictation but turns an ordinary commit into its own acknowledged edit (Terminal’s native editor) does not refuse them.

fn start_deferred_text(&mut self) -> Option<Receipt>

Begin one bounded deferred session after explicit host consent, preserving the existing original-field fingerprint. This grants no microphone access.

fn commit_deferred_text(&mut self, text: &str) -> Option<Receipt>

A private asynchronous final. None leaves ordinary synchronous IME dispatch to the host. A receipt binds this original field and must be acknowledged before the host releases its private recovery transcript.

fn ime_multiline(&self) -> bool

Whether the original focused editor accepts line feeds as text. This is field policy, never inferred from a multiline accessibility presentation. Wrappers inherit only one unambiguous child at their active IME caret.

fn presented(&self) -> bool

Default true; false only for a widget standing in for a window’s content whose first frame has not drawn. Must latch: once true, never false again for the same content.

fn arrives_from(&self) -> Source

Where this content’s first frame comes from while it has not presented: this device (an app starting here), another device or a host. A frame from this device may hold the window’s first frame up to one frame budget; any other reserves the window’s place and says where it comes from after a while.

fn arrival_progress(&self) -> Option<Progress>

How much of what this content’s first frame waits on has come, when that measures itself (its app downloaded before it starts).

fn arrival_shape(&self) -> SkeletonShape

The shape this content declares for the placeholder standing in for its first frame. Undeclared, the placeholder is the ground alone: nothing guesses what a window will show.

fn text_review(&self) -> Option<(usize, String)>

(caret_byte, text), byte offset on a char boundary. The host diffs this before/after an event so caret-only moves (arrows, Home/End) get announced, not just typing.

fn on_external_event( &mut self, _payload: &str, _state: &mut Edits<'_>, _root: &(dyn Any + 'static), )

Delivers an out-of-band string payload from crate::app::UserEvent::External (e.g. a worker thread streaming output into a status log). Default no-op; the App redraws and re-syncs after dispatch, so mutating state here is enough.

fn on_nav_gesture( &mut self, dir: NavDirection, state: &(dyn Any + 'static), path: &(dyn Any + 'static), ) -> bool

Global back/forward gesture (swipe/edge-pull), recognised by crate::gesture::NavGestureRecognizer and delivered to the whole tree; return true once consumed. Default forwards to children, so a widget that owns history becomes swipe-navigable for free.

fn nav_availability(&self) -> NavAvailability

Which directions Self::on_nav_gesture would consume now. A widget that owns history overrides this beside on_nav_gesture.

fn take_focus_reset(&mut self) -> bool

One-shot (reading MUST clear it) signal to move focus to this subtree’s first focusable widget after the next rebuild. Only consulted under crate::app::App::autofocus_on_structure_change; a wizard raises it on step transitions.

fn take_accessibility_request(&mut self) -> Option<AccessibilityRequest>

One-shot (reading MUST clear it) request to change the window’s accessibility preferences, raised by a control the person used. The host applies it before the next frame. Default forwards the first request found among the children.

fn dev_route(&self) -> Option<RouteSnapshot>

Route history when this widget, or one it contains, is a Router.

fn restore_dev_route(&mut self, route: &RouteSnapshot) -> bool

Put route back. Returns whether a router in this subtree accepted it.

fn appearance_intent(&self) -> Option<AppearanceIntent>

Theme/high-contrast/reduced-motion/scale, polled under crate::app::App::appearance_reconcile — how a settings pane re-themes the running app live without a back-channel. Level-triggered; the App recurses Self::children itself, so containers need not forward it. First Some wins.

fn minimum_window_width(&self) -> Option<f64>

The narrowest this window still works at, in logical pixels: the minimum of its compact layout (a NavShell answers with one column at a time). The host states it to the window system, so the desktop stops a resize there. None: no opinion. The host walks the tree itself (minimum_window_width), so containers need not forward it; the first Some wins.

fn preferred_window_size(&self) -> Option<(f64, f64)>

The whole size this window wants, in logical pixels, when the app is the window’s only content and knows how big it must be: the on-screen keyboard parked to a strip. The host states it as the window’s minimum and maximum, so the desktop shapes the surface to it. None: the window is the user’s and the app lays itself out in whatever it gets.

fn set_motion_reduced(&mut self, reduced: bool)

Apply the effective reduced-motion preference before the host asks this subtree whether it needs another animation frame. The default forwards recursively, making the preference a framework policy instead of an optional convention that every container has to remember to implement.

fn needs_idle_sync(&self) -> bool

Whether sync still needs to run on idle frames without input or collab events — e.g. waiting out a document-adoption grace window.

fn wants_pointer_capture(&self) -> bool

fn disclosing(&self) -> Option<Disclosing>

While this widget is a band on its way in or out (motion::Disclosure: an in-window banner arriving or leaving), or a content-sized container one moves in, how far what follows it is drawn from where it is laid out. A moving band stands out of the layout; its container places it (Self::place_disclosing) and draws the widgets after it lower by transform, so they move with the band’s edge instead of being laid out again every frame. None at rest (the default).

fn place_disclosing(&mut self, _slot: Rect)

Where a band on its way (Disclosing::Band) stands while it is out of the layout: its slot’s top and width (slot’s height is zero), set by its container after each layout.

fn is_band(&self) -> bool

A band that comes and goes (an in-window banner): when its view stops building it, its column draws it leaving (widget::Disclosing). Its column leaves it out of its identity across rebuilds.

fn note_placement(&mut self, _placement: Placement)

Where a band stands in its column, set by the column after each layout: what it leaves when dropped, so the column a rebuild makes can draw it leaving.

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

Why this widget itself asks for animation frames, for diagnostics that name a desktop which keeps painting. None when it has nothing to add to its name and geometry.

fn needs_animation_frame(&self) -> bool

App polls this in Event::AboutToWait; without it a curve would freeze until an unrelated event woke it.

fn next_wake_deadline(&self) -> Option<Instant>

Earliest wall-clock deadline at which this subtree needs a sync or redraw with no input: the loop sleeps until then (not animation).

fn holds_frame_until(&self, now: Instant) -> Option<Instant>

Until when the frame that would show this subtree waits for data it reads from this device (crate::arriving): a local read that has not answered and is still inside its frame budget. The host keeps the frame on screen until then, or until the data lands, so the person never sees the space empty and then filled. Containers forward (the default does).

fn serve_deadline(&mut self, _now: Instant) -> bool

A deadline this subtree asked for (Self::next_wake_deadline) is due at now: do the work it was for, and say whether anything changed. The default says it did.

fn dismiss_presented_modal(&mut self) -> bool

Close every modal this subtree presents, as its own way out does (a host whose surface is a modal sheet calls it when the shell takes the sheet down). Whether any was presented; containers forward.

fn presents_modal(&self) -> bool

Whether this subtree presents a modal still drawn (arriving, open or leaving): the counterpart of Widget::dismiss_presented_modal.

fn take_structure_change(&mut self) -> StructureChange

Self::take_structure_dirty, saying whether the frame’s damage can still describe the rebuild (StructureChange::Described). Reading clears what take_structure_dirty clears; the two must agree on whether there is a change. The default is the flag, as a StructureChange::Rebuild: only a widget that knows every pixel its change touches lands in its own damage says less, and a container forwards a child’s StructureChange::Described only by overriding this.

fn remount_children(&mut self, remount: &mut Remount<'_>) -> bool

Carry out a StructureChange::Children this widget or one under it reported, in the retained layout tree, through remount (see remount). Returns false when it cannot be carried out in place: the host then rebuilds its tree, and the change is carried out by Self::build_layout. A widget reports such a change until either has carried it out. The default carries out its children’s.

fn has_pending_visual_work(&self) -> bool

Work already requested by this view whose completion will replace a placeholder. Unlike animations, this can be awaited by still captures.

fn has_transient_feedback(&self) -> bool

Temporary feedback currently presented, such as a save acknowledgement. Captures may intentionally include it; scene-invariance checks can wait for it to disappear separately from unfinished placeholder work.

fn collect_damage(&self, regions: &mut Vec<Rect>)

Logical-pixel bounds whose visual output differs from the last frame.

fn damage_covers_own_box(&self) -> bool

Whether, after this frame’s draw, this widget’s own Self::collect_damage covers every pixel a relayout changed by moving or resizing its layout box: a host that repaints where moved widgets were and are may then leave this widget’s box to it (its children’s boxes still count). A block editor that grew by a paragraph says where its blocks were and are; the default does not claim it.

fn mark_children_drawn(&mut self)

Rest this widget’s children after a frame drew them, for a widget that keeps its own dirty flag: it clears the flag itself, then calls this.

fn release_scene_cache(&mut self)

Release retained encoded-scene storage in this subtree without marking its visual/model state dirty. Outer caches call this after a successful reuse: while the outer display list is authoritative, keeping byte-for-byte descendant encodings only duplicates memory. A later outer rebuild causes descendants to record/cache normally.

fn composition_follows_allocation(&self) -> bool

Whether this widget composes its children from the size it was last allocated (it reads its own rect while building its layout: a compact layout under a width, a count of columns, an inset from a drawer). A window resize then needs a second composition against the new allocation, as well as the re-solve every resize gets. Widgets that compose independently of their allocation, or that report take_structure_dirty themselves when a new allocation changes what they show, keep the default: a resize re-solves the retained tree in place instead of recomposing all of it.

fn layout_needs_measure(&self) -> bool

Whether a layout_dirty frame needs taffy to re-solve sizes (compute_layout) rather than just reposition already-solved boxes. Scrollable is the motivating override: it translates its origin in apply_layout without changing any taffy size, so re-solving on every scroll frame is pure waste.

fn paint_bounds(&self) -> Rect

Everything this widget paints, children included; draw_child skips the draw when it misses the viewport. Override for widgets that paint past their own rect.

fn draw_overlay( &mut self, scene: &mut Scene, transform: Affine, text_renderer: &mut TextRenderer, theme: &Theme, presence: &PresenceCtx, )

Top-layer pass, run once after the whole draw recursion, so anything emitted here composites above every sibling regardless of tree order — the toolkit’s overlay mechanism for content that escapes its layout box (an open Dropdown, a popover). Default recurses children_mut.