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var __values = (this && this.__values) || function(o) { var s = typeof Symbol === "function" && Symbol.iterator, m = s && o[s], i = 0; if (m) return m.call(o); if (o && typeof o.length === "number") return { next: function () { if (o && i >= o.length) o = void 0; return { value: o && o[i++], done: !o }; } }; throw new TypeError(s ? "Object is not iterable." : "Symbol.iterator is not defined."); }; import { window } from './utils/globals'; import { isArray } from './utils/type-utils'; import { addEventListener } from './utils'; // This class is responsible for tracking scroll events and maintaining the scroll context var ScrollManager = /** @class */ (function () { function ScrollManager(instance) { var _this = this; this.instance = instance; this._updateScrollData = function () { var _a, _b, _c, _d; if (!_this.context) { _this.context = {}; } var el = _this.scrollElement(); var scrollY = _this.scrollY(); var scrollHeight = el ? Math.max(0, el.scrollHeight - el.clientHeight) : 0; var contentY = scrollY + ((el === null || el === void 0 ? void 0 : el.clientHeight) || 0); var contentHeight = (el === null || el === void 0 ? void 0 : el.scrollHeight) || 0; _this.context.lastScrollY = Math.ceil(scrollY); _this.context.maxScrollY = Math.max(scrollY, (_a = _this.context.maxScrollY) !== null && _a !== void 0 ? _a : 0); _this.context.maxScrollHeight = Math.max(scrollHeight, (_b = _this.context.maxScrollHeight) !== null && _b !== void 0 ? _b : 0); _this.context.lastContentY = contentY; _this.context.maxContentY = Math.max(contentY, (_c = _this.context.maxContentY) !== null && _c !== void 0 ? _c : 0); _this.context.maxContentHeight = Math.max(contentHeight, (_d = _this.context.maxContentHeight) !== null && _d !== void 0 ? _d : 0); }; } ScrollManager.prototype.getContext = function () { return this.context; }; ScrollManager.prototype.resetContext = function () { var ctx = this.context; // update the scroll properties for the new page, but wait until the next tick // of the event loop setTimeout(this._updateScrollData, 0); return ctx; }; // `capture: true` is required to get scroll events for other scrollable elements // on the page, not just the window // see https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener#usecapture ScrollManager.prototype.startMeasuringScrollPosition = function () { addEventListener(window, 'scroll', this._updateScrollData, { capture: true }); addEventListener(window, 'scrollend', this._updateScrollData, { capture: true }); addEventListener(window, 'resize', this._updateScrollData); }; ScrollManager.prototype.scrollElement = function () { var e_1, _a; if (this.instance.config.scroll_root_selector) { var selectors = isArray(this.instance.config.scroll_root_selector) ? this.instance.config.scroll_root_selector : [this.instance.config.scroll_root_selector]; try { for (var selectors_1 = __values(selectors), selectors_1_1 = selectors_1.next(); !selectors_1_1.done; selectors_1_1 = selectors_1.next()) { var selector = selectors_1_1.value; var element = window === null || window === void 0 ? void 0 : window.document.querySelector(selector); if (element) { return element; } } } catch (e_1_1) { e_1 = { error: e_1_1 }; } finally { try { if (selectors_1_1 && !selectors_1_1.done && (_a = selectors_1.return)) _a.call(selectors_1); } finally { if (e_1) throw e_1.error; } } return undefined; } else { return window === null || window === void 0 ? void 0 : window.document.documentElement; } }; ScrollManager.prototype.scrollY = function () { if (this.instance.config.scroll_root_selector) { var element = this.scrollElement(); return (element && element.scrollTop) || 0; } else { return window ? window.scrollY || window.pageYOffset || window.document.documentElement.scrollTop || 0 : 0; } }; ScrollManager.prototype.scrollX = function () { if (this.instance.config.scroll_root_selector) { var element = this.scrollElement(); return (element && element.scrollLeft) || 0; } else { return window ? window.scrollX || window.pageXOffset || window.document.documentElement.scrollLeft || 0 : 0; } }; return ScrollManager; }()); export { ScrollManager }; //# sourceMappingURL=scroll-manager.js.map