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"use client";
import { useRef } from "react";
import {
getCenteredLineLeft,
TIMELINE_INDICATOR_LINE_WIDTH_PX,
timelineTimeToSnappedPixels,
} from "@/timeline";
import { useTimelinePlayhead } from "@/timeline/hooks/use-timeline-playhead";
import {
addMediaTime,
maxMediaTime,
mediaTime,
subMediaTime,
TICKS_PER_SECOND,
ZERO_MEDIA_TIME,
} from "@/wasm";
import { useEditor } from "@/editor/use-editor";
import { TIMELINE_SCROLLBAR_SIZE_PX } from "./layout";
import { TIMELINE_LAYERS } from "./layers";
interface TimelinePlayheadProps {
zoomLevel: number;
hasHorizontalScrollbar: boolean;
rulerRef: React.RefObject<HTMLDivElement | null>;
rulerScrollRef: React.RefObject<HTMLDivElement | null>;
tracksScrollRef: React.RefObject<HTMLDivElement | null>;
timelineRef: React.RefObject<HTMLDivElement | null>;
playheadRef?: React.RefObject<HTMLDivElement | null>;
isSnappingToPlayhead?: boolean;
}
export function TimelinePlayhead({
zoomLevel,
hasHorizontalScrollbar,
rulerRef,
rulerScrollRef,
tracksScrollRef,
timelineRef,
playheadRef: externalPlayheadRef,
isSnappingToPlayhead = false,
}: TimelinePlayheadProps) {
const editor = useEditor();
const duration = editor.timeline.getTotalDuration();
const internalPlayheadRef = useRef<HTMLDivElement>(null);
const playheadRef = externalPlayheadRef || internalPlayheadRef;
const { handlePlayheadMouseDown } = useTimelinePlayhead({
zoomLevel,
rulerRef,
rulerScrollRef,
tracksScrollRef,
playheadRef,
});
const timelineContainerHeight =
timelineRef.current?.clientHeight ??
tracksScrollRef.current?.clientHeight ??
400;
const totalHeight = Math.max(
0,
timelineContainerHeight -
(hasHorizontalScrollbar ? TIMELINE_SCROLLBAR_SIZE_PX - 5 : 0),
);
const currentTime = editor.playback.getCurrentTime();
const centerPosition = timelineTimeToSnappedPixels({
time: currentTime,
zoomLevel,
});
const scrollLeft = tracksScrollRef.current?.scrollLeft ?? 0;
const leftPosition =
getCenteredLineLeft({ centerPixel: centerPosition }) - scrollLeft;
const handlePlayheadKeyDown = (
event: React.KeyboardEvent<HTMLDivElement>,
) => {
if (event.key !== "ArrowLeft" && event.key !== "ArrowRight") return;
event.preventDefault();
const fps = editor.project.getActive().settings.fps;
const ticksPerFrame = mediaTime({
ticks: Math.round(
(TICKS_PER_SECOND * fps.denominator) / fps.numerator,
),
});
const direction = event.key === "ArrowRight" ? 1 : -1;
const now = editor.playback.getCurrentTime();
const nextTime =
direction > 0
? addMediaTime({ a: now, b: ticksPerFrame })
: subMediaTime({ a: now, b: ticksPerFrame });
editor.playback.seek({
time: maxMediaTime({
a: ZERO_MEDIA_TIME,
b: duration < nextTime ? duration : nextTime,
}),
});
};
return (
<div
ref={playheadRef}
role="slider"
aria-label="Timeline playhead"
aria-valuemin={0}
aria-valuemax={duration}
aria-valuenow={currentTime}
tabIndex={0}
className="pointer-events-none absolute"
style={{
left: `${leftPosition}px`,
top: 0,
height: `${totalHeight}px`,
width: `${TIMELINE_INDICATOR_LINE_WIDTH_PX}px`,
zIndex: TIMELINE_LAYERS.playhead,
}}
onKeyDown={handlePlayheadKeyDown}
>
<div className="bg-primary pointer-events-none absolute left-0 h-full w-0.5" />
<button
type="button"
aria-label="Drag playhead"
className={`pointer-events-auto absolute top-1 left-1/2 size-3 -translate-x-1/2 transform cursor-col-resize rounded-full border-2 shadow-xs ${isSnappingToPlayhead ? "bg-primary border-primary" : "bg-primary border-primary/50"}`}
onMouseDown={handlePlayheadMouseDown}
/>
</div>
);
}
|
