page-scroll.js 1.1 KB

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  1. 'use strict';
  2. Object.defineProperty(exports, '__esModule', { value: true });
  3. exports.pageScrollMixin = void 0;
  4. function getCurrentPage() {
  5. var pages = getCurrentPages();
  6. return pages[pages.length - 1] || {};
  7. }
  8. function onPageScroll(event) {
  9. var _a = getCurrentPage().vanPageScroller,
  10. vanPageScroller = _a === void 0 ? [] : _a;
  11. vanPageScroller.forEach(function (scroller) {
  12. if (typeof scroller === 'function') {
  13. scroller(event);
  14. }
  15. });
  16. }
  17. exports.pageScrollMixin = function (scroller) {
  18. return Behavior({
  19. attached: function () {
  20. var page = getCurrentPage();
  21. if (Array.isArray(page.vanPageScroller)) {
  22. page.vanPageScroller.push(scroller.bind(this));
  23. } else {
  24. page.vanPageScroller =
  25. typeof page.onPageScroll === 'function'
  26. ? [page.onPageScroll.bind(page), scroller.bind(this)]
  27. : [scroller.bind(this)];
  28. }
  29. page.onPageScroll = onPageScroll;
  30. },
  31. detached: function () {
  32. var page = getCurrentPage();
  33. page.vanPageScroller = (page.vanPageScroller || []).filter(function (
  34. item
  35. ) {
  36. return item !== scroller;
  37. });
  38. },
  39. });
  40. };