framer-motion
Version:
A simple and powerful JavaScript animation library
36 lines (33 loc) • 1.37 kB
JavaScript
import { resolveEdge, namedEdges } from './edge.mjs';
const defaultOffset = [0, 0];
function resolveOffset(offset, containerLength, targetLength, targetInset) {
let offsetDefinition = Array.isArray(offset) ? offset : defaultOffset;
let targetPoint = 0;
let containerPoint = 0;
if (typeof offset === "number") {
/**
* If we're provided offset: [0, 0.5, 1] then each number x should become
* [x, x], so we default to the behaviour of mapping 0 => 0 of both target
* and container etc.
*/
offsetDefinition = [offset, offset];
}
else if (typeof offset === "string") {
offset = offset.trim();
if (offset.includes(" ")) {
offsetDefinition = offset.split(" ");
}
else {
/**
* If we're provided a definition like "100px" then we want to apply
* that only to the top of the target point, leaving the container at 0.
* Whereas a named offset like "end" should be applied to both.
*/
offsetDefinition = [offset, namedEdges[offset] ? offset : `0`];
}
}
targetPoint = resolveEdge(offsetDefinition[0], targetLength, targetInset);
containerPoint = resolveEdge(offsetDefinition[1], containerLength);
return targetPoint - containerPoint;
}
export { resolveOffset };