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

'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
exports.pageScrollMixin = void 0;
function getCurrentPage() {
  var pages = getCurrentPages();
  return pages[pages.length - 1] || {};
}
function onPageScroll(event) {
  var _a = getCurrentPage().vanPageScroller,
    vanPageScroller = _a === void 0 ? [] : _a;
  vanPageScroller.forEach(function (scroller) {
    if (typeof scroller === 'function') {
      // @ts-ignore
      scroller(event);
    }
  });
}
exports.pageScrollMixin = function (scroller) {
  return Behavior({
    attached: function () {
      var page = 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 page = getCurrentPage();
      page.vanPageScroller = (page.vanPageScroller || []).filter(function (
        item
      ) {
        return item !== scroller;
      });
    },
  });
};