framer-motion
Version:
A simple and powerful JavaScript animation library
91 lines (88 loc) • 3.64 kB
JavaScript
import { progress, noop } from 'motion-utils';
import { circOut } from '../../easing/circ.mjs';
import { mixNumber } from '../../utils/mix/number.mjs';
import { percent, px } from '../../value/types/numbers/units.mjs';
const borders = ["TopLeft", "TopRight", "BottomLeft", "BottomRight"];
const numBorders = borders.length;
const asNumber = (value) => typeof value === "string" ? parseFloat(value) : value;
const isPx = (value) => typeof value === "number" || px.test(value);
function mixValues(target, follow, lead, progress, shouldCrossfadeOpacity, isOnlyMember) {
if (shouldCrossfadeOpacity) {
target.opacity = mixNumber(0, lead.opacity ?? 1, easeCrossfadeIn(progress));
target.opacityExit = mixNumber(follow.opacity ?? 1, 0, easeCrossfadeOut(progress));
}
else if (isOnlyMember) {
target.opacity = mixNumber(follow.opacity ?? 1, lead.opacity ?? 1, progress);
}
/**
* Mix border radius
*/
for (let i = 0; i < numBorders; i++) {
const borderLabel = `border${borders[i]}Radius`;
let followRadius = getRadius(follow, borderLabel);
let leadRadius = getRadius(lead, borderLabel);
if (followRadius === undefined && leadRadius === undefined)
continue;
followRadius || (followRadius = 0);
leadRadius || (leadRadius = 0);
const canMix = followRadius === 0 ||
leadRadius === 0 ||
isPx(followRadius) === isPx(leadRadius);
if (canMix) {
target[borderLabel] = Math.max(mixNumber(asNumber(followRadius), asNumber(leadRadius), progress), 0);
if (percent.test(leadRadius) || percent.test(followRadius)) {
target[borderLabel] += "%";
}
}
else {
target[borderLabel] = leadRadius;
}
}
/**
* Mix rotation
*/
if (follow.rotate || lead.rotate) {
target.rotate = mixNumber(follow.rotate || 0, lead.rotate || 0, progress);
}
}
function getRadius(values, radiusName) {
return values[radiusName] !== undefined
? values[radiusName]
: values.borderRadius;
}
// /**
// * We only want to mix the background color if there's a follow element
// * that we're not crossfading opacity between. For instance with switch
// * AnimateSharedLayout animations, this helps the illusion of a continuous
// * element being animated but also cuts down on the number of paints triggered
// * for elements where opacity is doing that work for us.
// */
// if (
// !hasFollowElement &&
// latestLeadValues.backgroundColor &&
// latestFollowValues.backgroundColor
// ) {
// /**
// * This isn't ideal performance-wise as mixColor is creating a new function every frame.
// * We could probably create a mixer that runs at the start of the animation but
// * the idea behind the crossfader is that it runs dynamically between two potentially
// * changing targets (ie opacity or borderRadius may be animating independently via variants)
// */
// leadState.backgroundColor = followState.backgroundColor = mixColor(
// latestFollowValues.backgroundColor as string,
// latestLeadValues.backgroundColor as string
// )(p)
// }
const easeCrossfadeIn = /*@__PURE__*/ compress(0, 0.5, circOut);
const easeCrossfadeOut = /*@__PURE__*/ compress(0.5, 0.95, noop);
function compress(min, max, easing) {
return (p) => {
// Could replace ifs with clamp
if (p < min)
return 0;
if (p > max)
return 1;
return easing(progress(min, max, p));
};
}
export { mixValues };