import{type PropertyValues,type TemplateResult}from'lit';import{LyraElement}from'../../../internal/lyra-element.js';import type{LyraOrientation}from'../../../internal/shared-unions.js';export type LyraSplitPanelOrientation=LyraOrientation;export type LyraSplitPanelPrimary='start'|'end';export interface LyraSplitPanelSnapFunctionParams{
/** Proposed position in pixels, measured from the primary panel's edge. */
pos:number;
/** Split-panel size in pixels along its resize axis. */
size:number;
/** The configured snap threshold in pixels. */
snapThreshold:number;}export type LyraSplitPanelSnapFunction=(options:LyraSplitPanelSnapFunctionParams)=>number;
/** A snap function that returns the proposed position unchanged. */
export declare const SNAP_NONE:LyraSplitPanelSnapFunction;
/** A proposed user-driven divider position, normalized after constraints and snapping. */
export interface LyraSplitPanelRepositionDetail{
/** Position as a percentage from the selected primary pane's edge. */
position:number;
/** The same position in pixels from the selected primary pane's edge. */
positionInPixels:number;}export interface LyraSplitPanelEventMap{
/** Emitted before a pointer or keyboard interaction repositions the divider. */
'lr-reposition-request':CustomEvent<LyraSplitPanelRepositionDetail>;
/** Emitted whenever a pointer or keyboard interaction repositions the divider. */
'lr-reposition':CustomEvent<null>;}
/**
* `<lr-split-panel>` — an accessible, draggable two-pane layout.
*
* `position` and `positionInPixels` are measured from the selected `primary`
* panel's edge. Without a primary panel, `start` is the reference and its
* percentage is preserved when the component resizes. Selecting `start` or
* `end` instead preserves that panel's pixel size.
*
* @customElement lr-split-panel
* @slot start - Content in the logical start pane.
* @slot end - Content in the logical end pane.
* @slot divider - Optional decorative content rendered inside the draggable divider. Assigned
*   content is inert, so the separator remains the sole resize control.
* @event lr-reposition-request - A cancelable proposed divider position from a pointer drag or
*   keyboard interaction. Both detail values measure from the selected primary edge and match
*   accepted public readback. Call `preventDefault()` to keep `position` unchanged. Not fired when a
*   consumer sets `position` or `positionInPixels` directly. `detail: LyraSplitPanelRepositionDetail`.
* @event lr-reposition - Non-cancelable post-commit notification after a pointer or keyboard
*   interaction moves the divider. Not fired when a consumer sets `position` or
*   `positionInPixels` directly.
* @csspart base - The component's layout wrapper.
* @csspart split-panel - Compatibility alias on the layout wrapper.
* @csspart panel - Shared part on both pane wrappers.
* @csspart start - The logical start pane.
* @csspart end - The logical end pane.
* @csspart divider - The draggable separator. Its numeric ARIA range remains percentages while
*   `aria-valuetext` reports the measured current percentage through the effective locale.
* @cssprop [--divider-width=4px] - Visible divider thickness.
* @cssprop [--divider-hit-area=12px] - Requested divider hit area; Lyra's minimum hit-area token remains the floor.
* @cssprop [--min=0] - Minimum size of the primary pane, or the start pane when `primary` is unset.
* @cssprop [--max=100%] - Maximum size of the primary pane, or the start pane when `primary` is unset.
* @cssprop [--lr-split-panel-divider-width=var(--divider-width)] - Lyra-prefixed divider-width alias.
* @cssprop [--lr-split-panel-divider-hit-area=var(--divider-hit-area)] - Lyra-prefixed hit-area alias.
* @cssprop [--lr-split-panel-min=var(--min)] - Lyra-prefixed minimum-size alias.
* @cssprop [--lr-split-panel-max=var(--max)] - Lyra-prefixed maximum-size alias.
* @cssprop [--lr-split-panel-divider-hover-color=var(--lr-color-brand)] - Background of `divider`
*   on hover/keyboard focus, independent of any other component's own hover token that happens to
*   default to the same shared brand color.
* @cssprop [--lr-split-panel-divider-active-color=var(--lr-color-border-strong)] - Background of
*   `divider` while being dragged (or focused and pressed via the keyboard).
* @status stable
* @since 8.0.0
*/
export declare class LyraSplitPanel extends LyraElement<LyraSplitPanelEventMap>{static styles:import("lit").CSSResultGroup[];private _startPosition;private _orientation;private _primary?;private _snapThreshold;private availableSize;private pendingPositionInPixels?;private preservedPrimaryPixels?;private resizeObserver?;private resizeView?;private drag?;private dragView?;private readonly dividerSourceSnapshots;private dividerSourceObserver?;private dividerSourceObserverDocument?;private dividerSourceObserverGeneration;private normalizedSnapSource?;private cachedNormalizedSnapTokens;private baseElement?;private dividerElement?;private dividerSlot?;private minProbe?;private maxProbe?;
/** Divider position as a percentage from the primary panel's edge.
* @default 50 */
get position():number;set position(value:number);
/** Divider position in pixels from the primary panel's edge. */
get positionInPixels():number;set positionInPixels(value:number|undefined|null);
/** Layout axis. Horizontal places panes at logical start and end.
* @default 'horizontal' */
get orientation():LyraSplitPanelOrientation;set orientation(value:LyraSplitPanelOrientation);
/** Boolean compatibility alias for `orientation="vertical"`.
* @default false */
get vertical():boolean;set vertical(value:boolean);
/** Prevents pointer and keyboard repositioning. */
disabled:boolean;
/** Pane whose pixel size remains fixed while the host resizes. */
get primary():LyraSplitPanelPrimary|undefined;set primary(value:LyraSplitPanelPrimary|undefined|null);private _snap;
/** Space-separated pixel/percent snap points, `repeat(...)`, or a snap callback. String
* preprocessing reads at most 16,384 UTF-16 code units and retains at most 256 finite valid
* tokens, caching their numeric value/unit projection until the source changes. Assigning the Web Awesome `undefined`
* spelling restores the inert empty-string read default. */
get snap():string|LyraSplitPanelSnapFunction;set snap(value:string|LyraSplitPanelSnapFunction|undefined);
/** Maximum distance in pixels at which string snap points take effect.
* @default 12 */
get snapThreshold():number;set snapThreshold(value:number);private get effectiveOrientation();private measuredLayoutSize;connectedCallback():void;disconnectedCallback():void;firstUpdated(changed:PropertyValues):void;protected updated(changed:PropertyValues<this>):void;private requestSynchronizedUpdate;private axisSize;private constraintBounds;
/** Resolves a user or property-supplied position without mutating public
*  state. The interaction request event needs this finalized (snapped and
*  constrained) value before any assignment occurs. */
private resolvePrimaryPixels;private applyPrimaryPixels;
/** Proposes a finalized user-driven position before committing it. Direct
*  property assignments deliberately continue through applyPrimaryPixels()
*  without either interaction event. */
private requestReposition;private measureAndSynchronize;private synchronizeMeasuredDom;private observeSize;private readonly onWindowResize;private snapshotDividerSource;private adoptDividerSourceInert;private makeDividerSourceInert;private restoreDividerSource;private restoreDividerSources;private resetDividerSourceObserver;private observeDividerSources;private syncDividerSources;private readonly onDividerSlotChange;private resolveNormalizedSnapLength;private get normalizedSnapTokens();private applySnap;private pointerCoordinate;private onPointerDown;private readonly onPointerMove;private readonly onPointerEnd;private onLostPointerCapture;private stopDragging;private onKeyDown;private get separatorLabel();private resizeValueText;private get ariaBounds();render():TemplateResult;}declare global{interface HTMLElementTagNameMap{'lr-split-panel':LyraSplitPanel;}}