ngx-owl-carousel-o
Version:
Angular powered owl-carousel
72 lines • 12 kB
JavaScript
import * as tslib_1 from "tslib";
import { Injectable } from '@angular/core';
import { merge } from 'rxjs';
import { CarouselService } from './carousel.service';
import { tap } from 'rxjs/operators';
var LazyLoadService = /** @class */ (function () {
function LazyLoadService(carouselService) {
this.carouselService = carouselService;
this.spyDataStreams();
}
LazyLoadService.prototype.ngOnDestroy = function () {
this.lazyLoadSubscription.unsubscribe();
};
/**
* Defines Observables which service must observe
*/
LazyLoadService.prototype.spyDataStreams = function () {
var _this = this;
var initializedCarousel$ = this.carouselService.getInitializedState().pipe(tap(function () {
var isLazyLoad = _this.carouselService.settings && !_this.carouselService.settings.lazyLoad;
_this.carouselService.slidesData.forEach(function (item) { return item.load = isLazyLoad ? true : false; });
}));
var changeSettings$ = this.carouselService.getChangeState();
var resizedCarousel$ = this.carouselService.getResizedState();
var lazyLoadMerge$ = merge(initializedCarousel$, changeSettings$, resizedCarousel$).pipe(tap(function (data) { return _this._defineLazyLoadSlides(data); }));
this.lazyLoadSubscription = lazyLoadMerge$.subscribe(function () { });
};
LazyLoadService.prototype._defineLazyLoadSlides = function (data) {
var _this = this;
if (!this.carouselService.settings || !this.carouselService.settings.lazyLoad) {
return;
}
if ((data.property && data.property.name === 'position') || data === 'initialized' || data === "resized") {
var settings = this.carouselService.settings, clones = this.carouselService.clones().length;
var n = (settings.center && Math.ceil(settings.items / 2) || settings.items), i = ((settings.center && n * -1) || 0), position = (data.property && data.property.value !== undefined ? data.property.value : this.carouselService.current()) + i;
// load = $.proxy(function(i, v) { this.load(v) }, this);
//TODO: Need documentation for this new option
if (settings.lazyLoadEager > 0) {
n += settings.lazyLoadEager;
// If the carousel is looping also preload images that are to the "left"
if (settings.loop) {
position -= settings.lazyLoadEager;
n++;
}
}
while (i++ < n) {
this._load(clones / 2 + this.carouselService.relative(position));
if (clones) {
this.carouselService.clones(this.carouselService.relative(position)).forEach(function (value) { return _this._load(value); });
}
position++;
}
}
};
/**
* Loads all resources of an item at the specified position.
* @param position - The absolute position of the item.
*/
LazyLoadService.prototype._load = function (position) {
if (this.carouselService.slidesData[position].load) {
return;
}
this.carouselService.slidesData[position].load = true;
};
LazyLoadService = tslib_1.__decorate([
Injectable(),
tslib_1.__metadata("design:paramtypes", [CarouselService])
], LazyLoadService);
return LazyLoadService;
}());
export { LazyLoadService };
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true : false);\r\n      })\r\n    );\r\n\r\n    const changeSettings$: Observable<any> = this.carouselService.getChangeState();\r\n\r\n    const resizedCarousel$: Observable<string> = this.carouselService.getResizedState();\r\n\r\n\r\n    const lazyLoadMerge$: Observable<string | any> = merge(initializedCarousel$, changeSettings$, resizedCarousel$).pipe(\r\n      tap(data => this._defineLazyLoadSlides(data)),\r\n      // tap(() => this.carouselService.sendChanges())\r\n    );\r\n    this.lazyLoadSubscription = lazyLoadMerge$.subscribe(\r\n      () => {}\r\n    );\r\n  }\r\n\r\n  private _defineLazyLoadSlides(data: any) {\r\n    if (!this.carouselService.settings || !this.carouselService.settings.lazyLoad) {\r\n      return;\r\n    }\r\n\r\n    if ((data.property && data.property.name === 'position') || data === 'initialized' || data === \"resized\") {\r\n      const settings = this.carouselService.settings,\r\n            clones = this.carouselService.clones().length;\r\n      let n = (settings.center && Math.ceil(settings.items / 2) || settings.items),\r\n          i = ((settings.center && n * -1) || 0),\r\n          position = (data.property && data.property.value !== undefined ? data.property.value : this.carouselService.current()) + i;\r\n        // load = $.proxy(function(i, v) { this.load(v) }, this);\r\n      //TODO: Need documentation for this new option\r\n      if (settings.lazyLoadEager > 0) {\r\n        n += settings.lazyLoadEager;\r\n        // If the carousel is looping also preload images that are to the \"left\"\r\n        if (settings.loop) {\r\n          position -= settings.lazyLoadEager;\r\n          n++;\r\n        }\r\n      }\r\n\r\n      while (i++ < n) {\r\n        this._load(clones / 2 + this.carouselService.relative(position));\r\n        if (clones) {\r\n          this.carouselService.clones(this.carouselService.relative(position)).forEach(value => this._load(value));\r\n\r\n        }\r\n        position++;\r\n      }\r\n    }\r\n  }\r\n\r\n  /**\r\n\t * Loads all resources of an item at the specified position.\r\n\t * @param position - The absolute position of the item.\r\n\t */\r\n  private _load(position: number) {\r\n    if (this.carouselService.slidesData[position].load) {\r\n      return;\r\n    }\r\n\r\n    this.carouselService.slidesData[position].load = true;\r\n  }\r\n}\r\n"]}