/**
 * Pure vertical-scroll geometry for the interactive `botmux list` session
 * picker. Extracted from the TUI render loop so the window math can be
 * regression-tested without an alt-screen: given the cursor, the previous
 * scroll offset, the row count and the terminal height, decide which
 * contiguous window of rows is visible and how many are hidden above/below.
 *
 * The picker used to print every row unconditionally, so a long session list
 * overflowed the alt-screen and pushed the title, header and top rows off the
 * top (only the tail stayed visible). This keeps the cursor row inside a fixed
 * viewport and pins the surrounding chrome.
 */
export interface ScrollWindowInput {
    /** Index of the highlighted row. */
    cursor: number;
    /** First visible row index carried over from the previous render. */
    scrollTop: number;
    /** Total number of rows. */
    rowCount: number;
    /** Terminal height in rows (process.stdout.rows). */
    termRows: number;
    /** Rows reserved for the pinned title/header/footer chrome. */
    chromeRows: number;
    /** Never shrink the row viewport below this many rows. Default 3. */
    minViewportRows?: number;
}
export interface ScrollWindow {
    /** Clamped first-visible row index to use this render (feed back next time). */
    scrollTop: number;
    /** Number of row slots the viewport can show. */
    viewportRows: number;
    /** First visible row index (inclusive) — same as scrollTop. */
    viewStart: number;
    /** One past the last visible row index (exclusive). */
    viewEnd: number;
    /** Rows scrolled off the top. */
    hiddenAbove: number;
    /** Rows scrolled off the bottom. */
    hiddenBelow: number;
}
/**
 * Resolve the visible row window. Guarantees:
 *   - the cursor is always within [viewStart, viewEnd);
 *   - scrollTop is clamped to [0, max(0, rowCount - viewportRows)] so the last
 *     page is fully packed (no blank tail with content still hidden above);
 *   - hiddenAbove/hiddenBelow are exact and never negative.
 */
export declare function computeSessionPickerScrollWindow(input: ScrollWindowInput): ScrollWindow;
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