/** Gap kept between a floating panel and every viewport edge. */
export declare const VIEWPORT_MARGIN = 12;
/** Horizontal space reserved for the launcher tab on its side of the screen. */
export declare const TAB_WIDTH = 32;
/**
 * The horizontal band a floating panel may occupy: the viewport minus the edge
 * margin, minus the launcher tab on whichever side it sits.
 */
export interface ViewportFrame {
    vw: number;
    vh: number;
    minLeft: number;
    maxRight: number;
}
export declare function measureViewportFrame(tabPosition: 'left' | 'right'): ViewportFrame;
/** Widest a panel can be without crossing the edge margin or the launcher tab. */
export declare function panelWidth(preferred: number, frame: ViewportFrame): number;
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