import { RationalTime } from "@techsquidtv/canvas-timeline-utils";
import { TimelineCommandResult } from "@techsquidtv/canvas-timeline-core";
//#region src/hooks/viewport/useTimelineViewport.d.ts
/** Result returned by `useTimelineViewport`. */
interface UseTimelineViewportResult {
  /** Current horizontal timeline scroll offset in pixels. */
  scrollLeft: number;
  /** Current vertical timeline scroll offset in pixels. */
  scrollTop: number;
  /** Current zoom scale in pixels per second. */
  zoomScale: number;
  /** Measured timeline viewport width in pixels. */
  viewportWidth: number;
  /** Measured timeline viewport height in pixels. */
  viewportHeight: number;
  /** Explicit timeline duration, or undefined when duration follows content bounds. */
  duration: RationalTime | undefined;
  /** Maximum timeline content time used for playback and scroll bounds. */
  maxContentTime: RationalTime;
  /** Maximum horizontal scroll offset for the current viewport and content duration. */
  maxScrollLeft: number;
  /** Maximum vertical scroll offset for the current viewport and track stack. */
  maxScrollTop: number;
  /** Raw viewport duration represented by the current width and zoom. */
  viewportDurationTime: RationalTime;
  /** Raw viewport duration in seconds represented by the current width and zoom. */
  viewportDurationSeconds: number;
  /** Visible viewport start time. */
  visibleStartTime: RationalTime;
  /** Visible viewport end time, clamped to content bounds. */
  visibleEndTime: RationalTime;
  /** Visible viewport duration, clamped to content bounds. */
  visibleDurationTime: RationalTime;
  /** Visible viewport start time in seconds for display-only UI. */
  visibleStartSeconds: number;
  /** Visible viewport end time in seconds for display-only UI. */
  visibleEndSeconds: number;
  /** Visible viewport duration in seconds for display-only UI. */
  visibleDurationSeconds: number;
  /** Sets horizontal scroll offset, with final clamping delegated to the engine. */
  setScrollLeft: (scrollLeft: number) => TimelineCommandResult;
  /** Sets vertical scroll offset, with final clamping delegated to the engine. */
  setScrollTop: (scrollTop: number) => TimelineCommandResult;
  /** Sets zoom scale, with final clamping delegated to the engine. */
  setZoomScale: (zoomScale: number) => TimelineCommandResult;
  /** Stores the measured timeline viewport width in the engine. */
  setViewportWidth: (width: number) => TimelineCommandResult;
  /** Stores the measured timeline viewport height in the engine. */
  setViewportHeight: (height: number) => TimelineCommandResult;
  /** Sets an explicit timeline duration, or clears it when passed undefined. */
  setDuration: (duration: RationalTime | undefined) => TimelineCommandResult;
}
/**
 * Provides canonical viewport metrics and setters for custom timeline chrome.
 *
 * @returns Viewport metrics, visible time range, and viewport setters.
 */
declare function useTimelineViewport(): UseTimelineViewportResult;
//#endregion
export { UseTimelineViewportResult, useTimelineViewport };
//# sourceMappingURL=useTimelineViewport.d.mts.map