/**
 * The rail beside the book that the thumbnail and outline lists both sit in.
 *
 * It exists to solve one problem shared by every such panel: the container's measured box is what
 * the renderer sizes the book from and what pointer hit-testing maps into, so a panel must not
 * live inside it. Instead the book (and its docked toolbar, if any) is wrapped in a flex row with
 * the panel as its sibling, and `destroy` unwinds that again.
 *
 * The rail is absolutely positioned inside a holder that stretches to the book's height, so a
 * long list scrolls internally instead of running past the bottom of the book.
 *
 * On a wide screen the rail flanks the book and the book shrinks to make room (see styles.ts). On
 * a narrow one there is no room to flank, so the rail becomes a drawer over the book and a scrim
 * dims the page behind it; tapping the scrim or pressing Escape dismisses it through `onDismiss`.
 */
/** Shared options a toolbar threads into every panel constructor. */
export interface PanelOptions {
    /** Called when the reader dismisses the narrow-screen drawer (scrim tap or Escape). */
    onDismiss?: () => void;
}
/** The book's painted box inside the container, in container px (see Zine.getPageBox). */
type PageBox = {
    x: number;
    y: number;
    width: number;
    height: number;
};
export declare class Sidebar {
    #private;
    /** The scrolling list; panels append their rows here. */
    readonly root: HTMLElement;
    constructor(doc: Document, container: HTMLElement, options: {
        className: string;
        label: string;
        width: number;
        /** Called when the reader dismisses the drawer (scrim tap or Escape). Omit to disable both. */
        onDismiss?: () => void;
        /** Reading direction; the drawer slides in from the right instead of the left when true. */
        rtl?: boolean;
        /** Float over the book's edge instead of flanking it (so the book never resizes). Panels
         *  whose width is fixed and modest — the outline and search rails — prefer this; the wider
         *  thumbnail rail flanks so both stay fully visible. Only affects wide screens: below the
         *  breakpoint every panel is a drawer regardless. */
        overlay?: boolean;
        /** The book's painted box in container px. The rail stands exactly as tall as the page rather
         *  than the whole container, which is taller whenever the page is letterboxed (its aspect not
         *  matching the container's) or a docked toolbar padded the wrap. Re-read on every resize. */
        pageBox?: () => PageBox | null;
        /** aria-label for the drawer's close button. Defaults to 'Close'. */
        closeLabel?: string;
    });
    /** Resize the rail, e.g. once a thumbnail list knows whether it needs one column or two. */
    setWidth(px: number): void;
    destroy(): void;
}
export {};