vant-weapp/lib/mixins/page-scroll.js

'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
exports.pageScrollMixin = void 0;
var utils_1 = require('../common/utils');
function onPageScroll(event) {
  var _a = utils_1.getCurrentPage().vanPageScroller,
    vanPageScroller = _a === void 0 ? [] : _a;
  vanPageScroller.forEach(function (scroller) {
    if (typeof scroller === 'function') {
      // @ts-ignore
      scroller(event);
    }
  });
}
var pageScrollMixin = function (scroller) {
  return Behavior({
    attached: function () {
      var page = utils_1.getCurrentPage();
      if (Array.isArray(page.vanPageScroller)) {
        page.vanPageScroller.push(scroller.bind(this));
      } else {
        page.vanPageScroller =
          typeof page.onPageScroll === 'function'
            ? [page.onPageScroll.bind(page), scroller.bind(this)]
            : [scroller.bind(this)];
      }
      page.onPageScroll = onPageScroll;
    },
    detached: function () {
      var _a;
      var page = utils_1.getCurrentPage();
      if (!utils_1.isDef(page)) {
        page.vanPageScroller =
          ((_a = page.vanPageScroller) === null || _a === void 0
            ? void 0
            : _a.filter(function (item) {
                return item !== scroller;
              })) || [];
      }
    },
  });
};
exports.pageScrollMixin = pageScrollMixin;