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import { type JSX, useLayoutEffect, useRef } from "react";
import {
BASE_TIMELINE_PIXELS_PER_SECOND,
} from "@/lib/timeline/scale";
import { mediaTimeToSeconds } from "opencut-wasm";
import { TICKS_PER_SECOND } from "@/lib/wasm";
import { TIMELINE_RULER_HEIGHT_PX } from "./layout";
import { DEFAULT_FPS } from "@/lib/fps/defaults";
import { useEditor } from "@/hooks/use-editor";
import { getRulerConfig, shouldShowLabel } from "@/lib/timeline/ruler-utils";
import { useScrollPosition } from "@/hooks/timeline/use-scroll-position";
import { TimelineTick } from "./timeline-tick";
interface TimelineRulerProps {
zoomLevel: number;
dynamicTimelineWidth: number;
rulerRef: React.Ref<HTMLDivElement>;
tracksScrollRef: React.RefObject<HTMLElement | null>;
handleWheel: (e: React.WheelEvent) => void;
handleTimelineContentClick: (e: React.MouseEvent) => void;
handleRulerTrackingMouseDown: (e: React.MouseEvent) => void;
handleRulerMouseDown: (e: React.MouseEvent) => void;
}
export function TimelineRuler({
zoomLevel,
dynamicTimelineWidth,
rulerRef,
tracksScrollRef,
handleWheel,
handleTimelineContentClick,
handleRulerTrackingMouseDown,
handleRulerMouseDown,
}: TimelineRulerProps) {
const durationTicks = useEditor((e) => e.timeline.getTotalDuration());
const durationSeconds = mediaTimeToSeconds({ time: durationTicks });
const pixelsPerSecond = BASE_TIMELINE_PIXELS_PER_SECOND * zoomLevel;
const visibleDurationSeconds = dynamicTimelineWidth / pixelsPerSecond;
const effectiveDurationSeconds = Math.max(durationSeconds, visibleDurationSeconds);
const fps =
useEditor((e) => e.project.getActiveOrNull()?.settings.fps) ?? DEFAULT_FPS;
const { labelIntervalSeconds, tickIntervalSeconds } = getRulerConfig({
zoomLevel,
fps,
});
const tickCount = Math.ceil(effectiveDurationSeconds / tickIntervalSeconds) + 1;
const { scrollLeft, viewportWidth } = useScrollPosition({
scrollRef: tracksScrollRef,
});
/**
* widens the virtualization buffer during zoom transitions.
* useScrollPosition lags one frame behind the scroll adjustment
* that useLayoutEffect applies after a zoom change.
*/
const prevZoomRef = useRef(zoomLevel);
const isZoomTransition = zoomLevel !== prevZoomRef.current;
const bufferPx = isZoomTransition
? Math.max(200, (scrollLeft + viewportWidth) * 0.15)
: 200;
useLayoutEffect(() => {
prevZoomRef.current = zoomLevel;
}, [zoomLevel]);
const visibleStartTimeSeconds = Math.max(
0,
(scrollLeft - bufferPx) / pixelsPerSecond,
);
const visibleEndTimeSeconds =
(scrollLeft + viewportWidth + bufferPx) / pixelsPerSecond;
const startTickIndex = Math.max(
0,
Math.floor(visibleStartTimeSeconds / tickIntervalSeconds),
);
const endTickIndex = Math.min(
tickCount - 1,
Math.ceil(visibleEndTimeSeconds / tickIntervalSeconds),
);
const timelineTicks: Array<JSX.Element> = [];
for (
let tickIndex = startTickIndex;
tickIndex <= endTickIndex;
tickIndex += 1
) {
const timeSeconds = tickIndex * tickIntervalSeconds;
if (timeSeconds > effectiveDurationSeconds) break;
const timeTicks = Math.round(timeSeconds * TICKS_PER_SECOND);
const showLabel = shouldShowLabel({ time: timeSeconds, labelIntervalSeconds });
timelineTicks.push(
<TimelineTick
key={tickIndex}
time={timeTicks}
timeInSeconds={timeSeconds}
zoomLevel={zoomLevel}
fps={fps}
showLabel={showLabel}
/>,
);
}
return (
<div
role="slider"
tabIndex={0}
aria-label="Timeline ruler"
aria-valuemin={0}
aria-valuemax={effectiveDurationSeconds}
aria-valuenow={0}
className="relative flex-1 overflow-x-visible"
style={{ height: TIMELINE_RULER_HEIGHT_PX }}
onWheel={handleWheel}
onClick={(event) => {
// Ruler seek already happens on mousedown via playhead scrubbing.
// Forwarding the follow-up click re-enters the selection-clearing path.
if (event.target === event.currentTarget) {
handleTimelineContentClick(event);
}
}}
onMouseDown={handleRulerTrackingMouseDown}
onKeyDown={() => {}}
>
<div
role="none"
ref={rulerRef}
className="relative cursor-default select-none"
style={{
height: TIMELINE_RULER_HEIGHT_PX,
width: `${dynamicTimelineWidth}px`,
}}
onMouseDown={handleRulerMouseDown}
>
{timelineTicks}
</div>
</div>
);
}
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