KeyframesResolver.mjs
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import { fillWildcards } from './utils/fill-wildcards.mjs';
import { removeNonTranslationalTransform } from './utils/unit-conversion.mjs';
import { frame } from '../../frameloop/frame.mjs';
const toResolve = new Set();
let isScheduled = false;
let anyNeedsMeasurement = false;
let isForced = false;
function measureAllKeyframes() {
if (anyNeedsMeasurement) {
const resolversToMeasure = Array.from(toResolve).filter((resolver) => resolver.needsMeasurement);
const elementsToMeasure = new Set(resolversToMeasure.map((resolver) => resolver.element));
const transformsToRestore = new Map();
/**
* Write pass
* If we're measuring elements we want to remove bounding box-changing transforms.
*/
elementsToMeasure.forEach((element) => {
const removedTransforms = removeNonTranslationalTransform(element);
if (!removedTransforms.length)
return;
transformsToRestore.set(element, removedTransforms);
element.render();
});
// Read
resolversToMeasure.forEach((resolver) => resolver.measureInitialState());
// Write
elementsToMeasure.forEach((element) => {
element.render();
const restore = transformsToRestore.get(element);
if (restore) {
restore.forEach(([key, value]) => {
element.getValue(key)?.set(value);
});
}
});
// Read
resolversToMeasure.forEach((resolver) => resolver.measureEndState());
// Write
resolversToMeasure.forEach((resolver) => {
if (resolver.suspendedScrollY !== undefined) {
window.scrollTo(0, resolver.suspendedScrollY);
}
});
}
anyNeedsMeasurement = false;
isScheduled = false;
toResolve.forEach((resolver) => resolver.complete(isForced));
toResolve.clear();
}
function readAllKeyframes() {
toResolve.forEach((resolver) => {
resolver.readKeyframes();
if (resolver.needsMeasurement) {
anyNeedsMeasurement = true;
}
});
}
function flushKeyframeResolvers() {
isForced = true;
readAllKeyframes();
measureAllKeyframes();
isForced = false;
}
class KeyframeResolver {
constructor(unresolvedKeyframes, onComplete, name, motionValue, element, isAsync = false) {
this.state = "pending";
/**
* Track whether this resolver is async. If it is, it'll be added to the
* resolver queue and flushed in the next frame. Resolvers that aren't going
* to trigger read/write thrashing don't need to be async.
*/
this.isAsync = false;
/**
* Track whether this resolver needs to perform a measurement
* to resolve its keyframes.
*/
this.needsMeasurement = false;
this.unresolvedKeyframes = [...unresolvedKeyframes];
this.onComplete = onComplete;
this.name = name;
this.motionValue = motionValue;
this.element = element;
this.isAsync = isAsync;
}
scheduleResolve() {
this.state = "scheduled";
if (this.isAsync) {
toResolve.add(this);
if (!isScheduled) {
isScheduled = true;
frame.read(readAllKeyframes);
frame.resolveKeyframes(measureAllKeyframes);
}
}
else {
this.readKeyframes();
this.complete();
}
}
readKeyframes() {
const { unresolvedKeyframes, name, element, motionValue } = this;
// If initial keyframe is null we need to read it from the DOM
if (unresolvedKeyframes[0] === null) {
const currentValue = motionValue?.get();
// TODO: This doesn't work if the final keyframe is a wildcard
const finalKeyframe = unresolvedKeyframes[unresolvedKeyframes.length - 1];
if (currentValue !== undefined) {
unresolvedKeyframes[0] = currentValue;
}
else if (element && name) {
const valueAsRead = element.readValue(name, finalKeyframe);
if (valueAsRead !== undefined && valueAsRead !== null) {
unresolvedKeyframes[0] = valueAsRead;
}
}
if (unresolvedKeyframes[0] === undefined) {
unresolvedKeyframes[0] = finalKeyframe;
}
if (motionValue && currentValue === undefined) {
motionValue.set(unresolvedKeyframes[0]);
}
}
fillWildcards(unresolvedKeyframes);
}
setFinalKeyframe() { }
measureInitialState() { }
renderEndStyles() { }
measureEndState() { }
complete(isForcedComplete = false) {
this.state = "complete";
this.onComplete(this.unresolvedKeyframes, this.finalKeyframe, isForcedComplete);
toResolve.delete(this);
}
cancel() {
if (this.state === "scheduled") {
toResolve.delete(this);
this.state = "pending";
}
}
resume() {
if (this.state === "pending")
this.scheduleResolve();
}
}
export { KeyframeResolver, flushKeyframeResolvers };
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