111 lines
12 KiB
JavaScript
111 lines
12 KiB
JavaScript
import { CommonModule, DOCUMENT, isPlatformBrowser } from '@angular/common';
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import { ContentChild, Directive, EventEmitter, Inject, NgModule, Output, PLATFORM_ID, TemplateRef } from '@angular/core';
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import * as i0 from "@angular/core";
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/**
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* Defer postpones the loading the content that is initially not in the viewport until it becomes visible on scroll.
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* @group Components
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*/
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export class DeferredLoader {
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document;
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platformId;
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el;
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renderer;
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viewContainer;
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cd;
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/**
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* Callback to invoke when deferred content is loaded.
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* @param {Event} event - Browser event.
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* @group Emits
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*/
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onLoad = new EventEmitter();
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template;
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documentScrollListener;
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view;
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window;
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constructor(document, platformId, el, renderer, viewContainer, cd) {
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this.document = document;
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this.platformId = platformId;
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this.el = el;
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this.renderer = renderer;
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this.viewContainer = viewContainer;
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this.cd = cd;
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this.window = this.document.defaultView;
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}
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ngAfterViewInit() {
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if (isPlatformBrowser(this.platformId)) {
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if (this.shouldLoad()) {
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this.load();
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}
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if (!this.isLoaded()) {
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this.documentScrollListener = this.renderer.listen(this.window, 'scroll', () => {
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if (this.shouldLoad()) {
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this.load();
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this.documentScrollListener && this.documentScrollListener();
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this.documentScrollListener = null;
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}
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});
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}
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}
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}
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shouldLoad() {
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if (this.isLoaded()) {
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return false;
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}
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else {
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let rect = this.el.nativeElement.getBoundingClientRect();
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let docElement = this.document.documentElement;
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let winHeight = docElement.clientHeight;
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return winHeight >= rect.top;
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}
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}
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load() {
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this.view = this.viewContainer.createEmbeddedView(this.template);
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this.onLoad.emit();
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this.cd.detectChanges();
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}
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isLoaded() {
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return this.view != null && isPlatformBrowser(this.platformId);
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}
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ngOnDestroy() {
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this.view = null;
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if (this.documentScrollListener) {
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this.documentScrollListener();
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}
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}
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static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.7", ngImport: i0, type: DeferredLoader, deps: [{ token: DOCUMENT }, { token: PLATFORM_ID }, { token: i0.ElementRef }, { token: i0.Renderer2 }, { token: i0.ViewContainerRef }, { token: i0.ChangeDetectorRef }], target: i0.ɵɵFactoryTarget.Directive });
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static ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "17.3.7", type: DeferredLoader, selector: "[pDefer]", outputs: { onLoad: "onLoad" }, host: { classAttribute: "p-element" }, queries: [{ propertyName: "template", first: true, predicate: TemplateRef, descendants: true }], ngImport: i0 });
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}
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i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.7", ngImport: i0, type: DeferredLoader, decorators: [{
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type: Directive,
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args: [{
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selector: '[pDefer]',
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host: {
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class: 'p-element'
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}
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}]
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}], ctorParameters: () => [{ type: Document, decorators: [{
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type: Inject,
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args: [DOCUMENT]
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}] }, { type: undefined, decorators: [{
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type: Inject,
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args: [PLATFORM_ID]
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}] }, { type: i0.ElementRef }, { type: i0.Renderer2 }, { type: i0.ViewContainerRef }, { type: i0.ChangeDetectorRef }], propDecorators: { onLoad: [{
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type: Output
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}], template: [{
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type: ContentChild,
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args: [TemplateRef]
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}] } });
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export class DeferModule {
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static ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "17.3.7", ngImport: i0, type: DeferModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
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static ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "14.0.0", version: "17.3.7", ngImport: i0, type: DeferModule, declarations: [DeferredLoader], imports: [CommonModule], exports: [DeferredLoader] });
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static ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "17.3.7", ngImport: i0, type: DeferModule, imports: [CommonModule] });
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}
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i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "17.3.7", ngImport: i0, type: DeferModule, decorators: [{
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type: NgModule,
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args: [{
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imports: [CommonModule],
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exports: [DeferredLoader],
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declarations: [DeferredLoader]
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}]
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}] });
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