18 lines
542 B
JavaScript
18 lines
542 B
JavaScript
import { frame, cancelFrame } from '../frameloop/frame.mjs';
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function observeTimeline(update, timeline) {
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let prevProgress;
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const onFrame = () => {
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const { currentTime } = timeline;
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const percentage = currentTime === null ? 0 : currentTime.value;
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const progress = percentage / 100;
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if (prevProgress !== progress) {
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update(progress);
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}
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prevProgress = progress;
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};
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frame.preUpdate(onFrame, true);
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return () => cancelFrame(onFrame);
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}
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export { observeTimeline };
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