@zag-js/scroll-snap/dist/index.js

Scroll snap utilities

"use strict";
var __defProp = Object.defineProperty;
var __getOwnPropDesc = Object.getOwnPropertyDescriptor;
var __getOwnPropNames = Object.getOwnPropertyNames;
var __hasOwnProp = Object.prototype.hasOwnProperty;
var __export = (target, all) => {
  for (var name in all)
    __defProp(target, name, { get: all[name], enumerable: true });
};
var __copyProps = (to, from, except, desc) => {
  if (from && typeof from === "object" || typeof from === "function") {
    for (let key of __getOwnPropNames(from))
      if (!__hasOwnProp.call(to, key) && key !== except)
        __defProp(to, key, { get: () => from[key], enumerable: !(desc = __getOwnPropDesc(from, key)) || desc.enumerable });
  }
  return to;
};
var __toCommonJS = (mod) => __copyProps(__defProp({}, "__esModule", { value: true }), mod);

// src/index.ts
var index_exports = {};
__export(index_exports, {
  findSnapPoint: () => findSnapPoint,
  getScrollSnapPositions: () => getScrollSnapPositions,
  getSnapPointTarget: () => getSnapPointTarget,
  getSnapPositions: () => getSnapPositions
});
module.exports = __toCommonJS(index_exports);
var import_dom_query = require("@zag-js/dom-query");
var getDirection = (element) => (0, import_dom_query.getComputedStyle)(element).direction;
var convert = (raw, size) => {
  let n = parseFloat(raw);
  if (/%/.test(raw)) {
    n /= 100;
    n *= size;
  }
  return Number.isNaN(n) ? 0 : n;
};
function getScrollPadding(element) {
  const style = (0, import_dom_query.getComputedStyle)(element);
  const layoutWidth = element.offsetWidth;
  const layoutHeight = element.offsetHeight;
  let xBeforeRaw = style.getPropertyValue("scroll-padding-left").replace("auto", "0px");
  let yBeforeRaw = style.getPropertyValue("scroll-padding-top").replace("auto", "0px");
  let xAfterRaw = style.getPropertyValue("scroll-padding-right").replace("auto", "0px");
  let yAfterRaw = style.getPropertyValue("scroll-padding-bottom").replace("auto", "0px");
  let xBefore = convert(xBeforeRaw, layoutWidth);
  let yBefore = convert(yBeforeRaw, layoutHeight);
  let xAfter = convert(xAfterRaw, layoutWidth);
  let yAfter = convert(yAfterRaw, layoutHeight);
  return {
    x: { before: xBefore, after: xAfter },
    y: { before: yBefore, after: yAfter }
  };
}
function isRectIntersecting(a, b, axis = "both") {
  return axis === "x" && a.right >= b.left && a.left <= b.right || axis === "y" && a.bottom >= b.top && a.top <= b.bottom || axis === "both" && a.right >= b.left && a.left <= b.right && a.bottom >= b.top && a.top <= b.bottom;
}
function getDescendants(parent) {
  let children = [];
  for (const child of parent.children) {
    children = children.concat(child, getDescendants(child));
  }
  return children;
}
function getSnapPositions(parent, subtree = false) {
  const parentRect = parent.getBoundingClientRect();
  const dir = getDirection(parent);
  const isRtl = dir === "rtl";
  const scale = (0, import_dom_query.getScale)(parent);
  const positions = {
    x: { start: [], center: [], end: [] },
    y: { start: [], center: [], end: [] }
  };
  const children = subtree ? getDescendants(parent) : parent.children;
  for (const axis of ["x", "y"]) {
    const orthogonalAxis = axis === "x" ? "y" : "x";
    const axisStart = axis === "x" ? "left" : "top";
    const axisEnd = axis === "x" ? "right" : "bottom";
    const axisSize = axis === "x" ? "width" : "height";
    const axisScroll = axis === "x" ? "scrollLeft" : "scrollTop";
    const axisScale = axis === "x" ? scale.x : scale.y;
    const useRtlCalc = isRtl && axis === "x";
    for (const child of children) {
      const childRect = child.getBoundingClientRect();
      if (!isRectIntersecting(parentRect, childRect, orthogonalAxis)) {
        continue;
      }
      const childStyle = (0, import_dom_query.getComputedStyle)(child);
      let [childAlignY, childAlignX] = childStyle.getPropertyValue("scroll-snap-align").split(" ");
      if (typeof childAlignX === "undefined") {
        childAlignX = childAlignY;
      }
      const childAlign = axis === "x" ? childAlignX : childAlignY;
      let childOffsetStart;
      let childOffsetEnd;
      let childOffsetCenter;
      if (useRtlCalc) {
        const scrollOffset = Math.abs(parent[axisScroll]);
        const rightOffset = (parentRect[axisEnd] - childRect[axisEnd]) / axisScale + scrollOffset;
        childOffsetStart = rightOffset;
        childOffsetEnd = rightOffset + childRect[axisSize] / axisScale;
        childOffsetCenter = rightOffset + childRect[axisSize] / (2 * axisScale);
      } else {
        childOffsetStart = (childRect[axisStart] - parentRect[axisStart]) / axisScale + parent[axisScroll];
        childOffsetEnd = childOffsetStart + childRect[axisSize] / axisScale;
        childOffsetCenter = childOffsetStart + childRect[axisSize] / (2 * axisScale);
      }
      switch (childAlign) {
        case "none":
          break;
        case "start":
          positions[axis].start.push({ node: child, position: childOffsetStart });
          break;
        case "center":
          positions[axis].center.push({ node: child, position: childOffsetCenter });
          break;
        case "end":
          positions[axis].end.push({ node: child, position: childOffsetEnd });
          break;
      }
    }
  }
  return positions;
}
function getScrollSnapPositions(element) {
  const dir = getDirection(element);
  const scrollPadding = getScrollPadding(element);
  const snapPositions = getSnapPositions(element);
  const layoutWidth = element.offsetWidth;
  const layoutHeight = element.offsetHeight;
  const maxScroll = {
    x: element.scrollWidth - element.offsetWidth,
    y: element.scrollHeight - element.offsetHeight
  };
  const isRtl = dir === "rtl";
  const usesNegativeScrollLeft = isRtl && element.scrollLeft <= 0;
  let xPositions;
  if (isRtl) {
    xPositions = uniq(
      [
        ...snapPositions.x.start.map((v) => v.position - scrollPadding.x.after),
        ...snapPositions.x.center.map((v) => v.position - layoutWidth / 2),
        ...snapPositions.x.end.map((v) => v.position - layoutWidth + scrollPadding.x.before)
      ].map(clamp(0, maxScroll.x))
    );
    if (usesNegativeScrollLeft) {
      xPositions = xPositions.map((pos) => -pos);
    }
  } else {
    xPositions = uniq(
      [
        ...snapPositions.x.start.map((v) => v.position - scrollPadding.x.before),
        ...snapPositions.x.center.map((v) => v.position - layoutWidth / 2),
        ...snapPositions.x.end.map((v) => v.position - layoutWidth + scrollPadding.x.after)
      ].map(clamp(0, maxScroll.x))
    );
  }
  return {
    x: xPositions,
    y: uniq(
      [
        ...snapPositions.y.start.map((v) => v.position - scrollPadding.y.before),
        ...snapPositions.y.center.map((v) => v.position - layoutHeight / 2),
        ...snapPositions.y.end.map((v) => v.position - layoutHeight + scrollPadding.y.after)
      ].map(clamp(0, maxScroll.y))
    )
  };
}
function findSnapPoint(parent, axis, predicate) {
  const dir = getDirection(parent);
  const scrollPadding = getScrollPadding(parent);
  const snapPositions = getSnapPositions(parent);
  const items = [...snapPositions[axis].start, ...snapPositions[axis].center, ...snapPositions[axis].end];
  const isRtl = dir === "rtl";
  const usesNegativeScrollLeft = isRtl && axis === "x" && parent.scrollLeft <= 0;
  for (const item of items) {
    if (predicate(item.node)) {
      let position;
      if (axis === "x" && isRtl) {
        position = item.position - scrollPadding.x.after;
        if (usesNegativeScrollLeft) {
          position = -position;
        }
      } else {
        position = item.position - (axis === "x" ? scrollPadding.x.before : scrollPadding.y.before);
      }
      return position;
    }
  }
}
function getSnapPointTarget(parent, snapPoint) {
  const rect = parent.getBoundingClientRect();
  const scale = (0, import_dom_query.getScale)(parent);
  const scrollPadding = getScrollPadding(parent);
  const children = Array.from(parent.children);
  const layoutWidth = parent.offsetWidth;
  const layoutHeight = parent.offsetHeight;
  for (const child of children) {
    const childRect = child.getBoundingClientRect();
    const childOffsetStart = {
      x: (childRect.left - rect.left) / scale.x + parent.scrollLeft,
      y: (childRect.top - rect.top) / scale.y + parent.scrollTop
    };
    const childLayoutWidth = childRect.width / scale.x;
    const childLayoutHeight = childRect.height / scale.y;
    const matchesX = [
      childOffsetStart.x - scrollPadding.x.before,
      // start
      childOffsetStart.x + childLayoutWidth / 2 - layoutWidth / 2,
      // center
      childOffsetStart.x + childLayoutWidth - layoutWidth + scrollPadding.x.after
      // end
    ].some((pos) => Math.abs(pos - snapPoint) < 1);
    const matchesY = [
      childOffsetStart.y - scrollPadding.y.before,
      childOffsetStart.y + childLayoutHeight / 2 - layoutHeight / 2,
      childOffsetStart.y + childLayoutHeight - layoutHeight + scrollPadding.y.after
    ].some((pos) => Math.abs(pos - snapPoint) < 1);
    if (matchesX || matchesY) {
      return child;
    }
  }
  return children[0];
}
var uniq = (arr) => [...new Set(arr)];
var clamp = (min, max) => (value) => Math.max(min, Math.min(max, value));
// Annotate the CommonJS export names for ESM import in node:
0 && (module.exports = {
  findSnapPoint,
  getScrollSnapPositions,
  getSnapPointTarget,
  getSnapPositions
});