/**
 * Matches the `max-width: 480px` block in widget.css, where every panel that
 * holds a text field stops being a card anchored near the annotation and
 * becomes a bottom sheet.
 */
export declare const SHEET_MAX_WIDTH = 480;
export declare function isSheetViewport(): boolean;
/**
 * Hands a panel's geometry to the stylesheet on narrow screens, and keeps it
 * clear of the software keyboard.
 *
 * Two jobs that have to live together. The panels each position themselves
 * with inline `left`/`top`, which would beat the media query and drag the sheet
 * back into a floating card — so the inline values have to be cleared, not just
 * overridden. And a `position: fixed` sheet gets no help from the browser's
 * scroll-into-view, which only moves elements in the document flow, so the
 * keyboard simply covers it unless something lifts it.
 *
 * Shared by the comment popup, the clarify card, and the draw note bar: all
 * three carry a text field, and all three are the last thing between a reporter
 * and a submitted report.
 */
export declare class SheetLayout {
    private el;
    private inset;
    constructor(el: HTMLElement);
    /** Returns true when this took over layout, i.e. the caller should not position. */
    apply(): boolean;
    release(): void;
    /**
     * Lifting is clamped so the panel's own top edge stays on screen.
     *
     * The rule is geometric rather than a guess about how tall a keyboard gets:
     * an earlier version refused any inset above 60% of the window, a number
     * calibrated from a single reading on a single device. What actually matters
     * is that the reporter can still see and reach the panel, and that is a
     * question about this panel's height, which is known right here.
     */
    private lift;
}
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