import{type PropertyValues,type TemplateResult}from'lit';import{LyraElement}from'../../../internal/lyra-element.js';import{type LyraTopic}from'./mind-map-layout.js';export type{LyraTopic};export interface LyraMindMapEventMap{'lr-topic-select':CustomEvent<{topicId:string;}>;'lr-topic-toggle':CustomEvent<{topicId:string;expanded:boolean;}>;}
/**
* `<lr-mind-map>` — a radial expandable topic tree (NotebookLM Mind Maps): a spatial overview of
* a topic hierarchy where activating a topic drills in or hands the topic to the chat. Hierarchy,
* not network — no cross-links, no force simulation, no communities, no edge labels (that's
* `lr-graph`). Zero-dependency SVG; the radial layout is closed-form arithmetic, in its own
* `mind-map-layout.ts` module, mirroring `lr-word-cloud`'s dependency-free precedent.
*
* Node-position transitions use `--lr-transition-base`, which already collapses to near-zero
* under `prefers-reduced-motion: reduce` globally (`tokens.styles.ts`), so expansion snaps rather
* than tweening for a reduced-motion user with no extra branching in this component.
*
* Public collection properties take bounded, clone-owned readonly snapshots. Create a new
* collection and reassign it after changes; mutating the assigned array does not update the view.
*
* @customElement lr-mind-map
* @event lr-topic-select - A *leaf* topic was activated. `detail: { topicId }`.
* @event lr-topic-toggle - A parent topic was activated (or auto-expanded by keyboard descent).
* `detail: { topicId, expanded }`.
* @csspart base - The wrapper.
* @csspart svg - The single-tab-stop SVG focus target.
* @csspart node - A topic node group.
* @csspart node-label - A topic's label text.
* @csspart link - A parent-child connector.
* @csspart focus-ring - The keyboard focus ring, drawn from the moment the svg takes focus (the
* first placed topic is seeded as the keyboard cursor) rather than only after the first arrow key.
* @csspart live-region - The visually hidden announcement region.
* @csspart empty - The empty-state message, shown when `topics` is empty.
* @cssprop [--lr-mind-map-ring-gap=6rem] - Radius step per depth ring.
* @cssprop [--lr-mind-map-node-hover-halo=var(--lr-color-brand-quiet)] - Stroke color of the
* hover halo drawn around a topic node's dot, giving mouse users the same "this is clickable"
* feedback keyboard users get from the drawn focus ring.
* @status stable
* @since 4.0.0
*/
export declare class LyraMindMap extends LyraElement<LyraMindMapEventMap>{protected static readonly ownedCollectionProperties:readonly string[];static styles:import("lit").CSSResultGroup[];static get observedAttributes():string[];
/** A single root sits at the center; multiple roots hang off an implicit center hub whose
*  visible text is `label`. */
topics:readonly LyraTopic[];
/** Accessible name for the SVG group *and* the implicit hub's text; falls back to the localized
*  `mindMapLabel` when omitted. An explicitly empty override stays empty. */
label?:string;
/** Initial expansion depth (root + first ring). Expansion state is component-managed
*  afterward, keyed by topic id, and survives `topics` reassignment. */
expandDepth:number;private svgEl?;
/** Explicit user overrides only -- the default (`depth < expandDepth`) is computed at read time
*  in `isExpanded()`, so a user can override in either direction without losing the override on
*  a later `topics` reassignment that reintroduces the same id. */
private expandedOverrides;private focusedId;private liveText;private cachedLayout;private resizeObserver?;private resizeObserverDocument?;private resizeRafId?;private resizeRafOwner?;private resizeRafDocument?;private ownerRealmGeneration;private observedSize;private layoutInvalidated;private layoutContext;private announcementSink?;connectedCallback():void;private armResizeObserver;disconnectedCallback():void;adoptedCallback():void;private resetResizeWork;attributeChangedCallback(name:string,oldValue:string|null,value:string|null):void;
/** `expandDepth`, normalized to a finite non-negative integer (falling back to the property's own
*  default of `1`) -- a raw `NaN` (e.g. an invalid `expand-depth` attribute) would otherwise make
*  every `depth < expandDepth` comparison false, silently collapsing every ring instead of just
*  falling back to the default. */
private get effectiveExpandDepth();private isExpanded;
/** Resolves `--lr-mind-map-ring-gap` to a real used pixel value for whatever unit it carries --
*  a live root/host font-size read for rem/em (a hardcoded `* 16` gets ring spacing wrong on any
*  page whose root font-size isn't the browser default 16px), delegated to the shared
*  `resolveCssLength()` so every unit-resolving component agrees on what a length means. A value
*  in a unit that cannot be resolved to a used pixel length here (`ch`, `pt`, `calc()`, a bare
*  `%` with no base) falls back to the default gap rather than being read as raw pixels. */
private ringGapPx;private relayout;protected willUpdate(changed:PropertyValues):void;private setAnnouncement;private toggle;private activate;private siblingsOf;private childrenOf;private announce;private focusNodeById;private onKeyDown;private onFocusIn;private onNodeClick;private connectorControlPoint;private renderSemanticNode;render():TemplateResult;}declare global{interface HTMLElementTagNameMap{'lr-mind-map':LyraMindMap;}}