/**
 * Which rows of a list fit the lines it is given.
 *
 * A list that fits shows whole. One that does not shows a window that keeps
 * the caret in view, starting no later than it must, and gives a line to
 * naming the rows it leaves out above and another to those below. A row can
 * also be pinned above the window, such as the header of the group the caret
 * is in once the header has scrolled away; it takes a line of its own.
 */
export interface ListWindow {
    /** The first row the window shows. */
    readonly start: number;
    /** One past the last row the window shows. */
    readonly end: number;
    /** A row above the window shown before it, or `undefined`. */
    readonly pinned: number | undefined;
}
/**
 * The window over `count` rows that keeps `cursor` in view within `room`
 * lines. `pin` names the row to keep above a window that has scrolled past it.
 */
export declare const listWindow: (count: number, cursor: number, room: number, pin?: (cursor: number) => number | undefined) => ListWindow;
/** How many rows a window leaves out above itself, not counting a pinned row. */
export declare const skippedAbove: (window: ListWindow) => number;
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