/**
 * Transport-state mixin — time display, duration, playing state, capability
 * gating, and transport-button enable/disable logic.
 *
 * Owns: setPlayingState, handleCurrentChange, applyTime, applyDuration,
 *       _formatRemaining, applyStateVisibility, setContentHidden,
 *       refreshCapabilityVisibility, refreshTransportEnablement, setDisabled,
 *       safeCurrentIndex, safeQueueLength.
 */
import type { VideoPlaylistItem } from '../../../index.js';
import type { DesktopUiInternals } from '../internals.js';
export declare const transportStateMethods: {
    readonly setPlayingState: (this: DesktopUiInternals, playing: boolean) => void;
    readonly handleCurrentChange: (this: DesktopUiInternals, item: VideoPlaylistItem | undefined | null) => void;
    readonly applyTime: (this: DesktopUiInternals, seconds: number) => void;
    readonly applyDuration: (this: DesktopUiInternals, dur: number) => void;
    readonly _formatRemaining: (this: DesktopUiInternals, cur: number, dur: number) => string;
    /**
     * Display-state visibility: theater is meaningless inside fullscreen or
     * PiP, and PiP chrome floats over another window — navigation buttons
     * there act on the wrong surface. Config opt-outs always win.
     */
    readonly applyStateVisibility: (this: DesktopUiInternals) => void;
    /**
     * Mark a button as content-gated (no relevant tracks/items) so the fit
     * algorithm can skip it without counting its width.
     * Setting `data-content-hidden="true"` causes `applyAllVisibilityRules`
     * to treat the button as absent from the layout.
     */
    readonly setContentHidden: (this: DesktopUiInternals, btn: HTMLButtonElement, hidden: boolean) => void;
    readonly refreshCapabilityVisibility: (this: DesktopUiInternals) => void;
    readonly refreshTransportEnablement: (this: DesktopUiInternals) => void;
    readonly setDisabled: (this: DesktopUiInternals, btn: HTMLButtonElement, disabled: boolean) => void;
    readonly safeCurrentIndex: (this: DesktopUiInternals) => number;
    readonly safeQueueLength: (this: DesktopUiInternals) => number;
};