shineout/css/utils/dom/normalizeWheel.js

Shein 前端组件库

"use strict";

exports.__esModule = true;
exports.default = _default;
var PIXEL_STEP = 10;
var LINE_HEIGHT = 40;
var PAGE_HEIGHT = 800;
var DELTA_LENGTH = 120;

function _default(event) {
  var sX = 0;
  var sY = 0;
  var pX = 0;
  var pY = 0;

  if ('detail' in event) {
    sY = event.detail;
  }

  if ('wheelDelta' in event && event.wheelDelta) {
    sY = -event.wheelDelta / DELTA_LENGTH;
  }

  if ('wheelDeltaY' in event && event.wheelDeltaY) {
    sY = -event.wheelDeltaY / DELTA_LENGTH;
  }

  if ('wheelDeltaX' in event && event.wheelDeltaX) {
    sX = -event.wheelDeltaX / DELTA_LENGTH;
  }

  if ('axis' in event && event.axis === event.HORIZONTAL_AXIS) {
    sX = sY;
    sY = 0;
  }

  pX = sX * PIXEL_STEP;
  pY = sY * PIXEL_STEP;

  if ('deltaY' in event) {
    pY = event.deltaY;
  }

  if ('deltaX' in event) {
    pX = event.deltaX;
  }

  if ((pX || pY) && event.deltaMode) {
    if (event.deltaMode === 1) {
      pX *= LINE_HEIGHT;
      pY *= LINE_HEIGHT;
    } else {
      pX *= PAGE_HEIGHT;
      pY *= PAGE_HEIGHT;
    }
  }

  if (pX && !sX) {
    sX = pX < 1 ? -1 : 1;
  }

  if (pY && !sY) {
    sY = pY < 1 ? -1 : 1;
  }

  return {
    spinX: sX,
    spinY: sY,
    pixelX: pX,
    pixelY: pY
  };
}