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39 lines
1.5 KiB
Plaintext
39 lines
1.5 KiB
Plaintext
"use client";
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import { cancelFrame, frame } from 'motion-dom';
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import { useIsomorphicLayoutEffect } from '../utils/use-isomorphic-effect.mjs';
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import { useMotionValue } from './use-motion-value.mjs';
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function useCombineMotionValues(values, combineValues) {
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/**
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* Initialise the returned motion value. This remains the same between renders.
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*/
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const value = useMotionValue(combineValues());
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/**
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* Create a function that will update the template motion value with the latest values.
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* This is pre-bound so whenever a motion value updates it can schedule its
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* execution in Framesync. If it's already been scheduled it won't be fired twice
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* in a single frame.
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*/
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const updateValue = () => value.set(combineValues());
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/**
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* Synchronously update the motion value with the latest values during the render.
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* This ensures that within a React render, the styles applied to the DOM are up-to-date.
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*/
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updateValue();
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/**
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* Subscribe to all motion values found within the template. Whenever any of them change,
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* schedule an update.
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*/
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useIsomorphicLayoutEffect(() => {
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const scheduleUpdate = () => frame.preRender(updateValue, false, true);
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const subscriptions = values.map((v) => v.on("change", scheduleUpdate));
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return () => {
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subscriptions.forEach((unsubscribe) => unsubscribe());
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cancelFrame(updateValue);
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};
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});
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return value;
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}
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export { useCombineMotionValues };
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