primeng
Version:
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78 lines • 9.2 kB
JavaScript
import { NgModule, Directive, TemplateRef, EventEmitter, Output, ContentChild } from '@angular/core';
import { CommonModule } from '@angular/common';
import * as i0 from "@angular/core";
export class DeferredLoader {
constructor(el, renderer, viewContainer, cd) {
this.el = el;
this.renderer = renderer;
this.viewContainer = viewContainer;
this.cd = cd;
this.onLoad = new EventEmitter();
}
ngAfterViewInit() {
if (this.shouldLoad()) {
this.load();
}
if (!this.isLoaded()) {
this.documentScrollListener = this.renderer.listen('window', 'scroll', () => {
if (this.shouldLoad()) {
this.load();
this.documentScrollListener();
this.documentScrollListener = null;
}
});
}
}
shouldLoad() {
if (this.isLoaded()) {
return false;
}
else {
let rect = this.el.nativeElement.getBoundingClientRect();
let docElement = document.documentElement;
let winHeight = docElement.clientHeight;
return (winHeight >= rect.top);
}
}
load() {
this.view = this.viewContainer.createEmbeddedView(this.template);
this.onLoad.emit();
this.cd.detectChanges();
}
isLoaded() {
return this.view != null;
}
ngOnDestroy() {
this.view = null;
if (this.documentScrollListener) {
this.documentScrollListener();
}
}
}
DeferredLoader.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.0.4", ngImport: i0, type: DeferredLoader, deps: [{ token: i0.ElementRef }, { token: i0.Renderer2 }, { token: i0.ViewContainerRef }, { token: i0.ChangeDetectorRef }], target: i0.ɵɵFactoryTarget.Directive });
DeferredLoader.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "12.0.0", version: "12.0.4", type: DeferredLoader, selector: "[pDefer]", outputs: { onLoad: "onLoad" }, queries: [{ propertyName: "template", first: true, predicate: TemplateRef, descendants: true }], ngImport: i0 });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.0.4", ngImport: i0, type: DeferredLoader, decorators: [{
type: Directive,
args: [{
selector: '[pDefer]'
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: i0.Renderer2 }, { type: i0.ViewContainerRef }, { type: i0.ChangeDetectorRef }]; }, propDecorators: { onLoad: [{
type: Output
}], template: [{
type: ContentChild,
args: [TemplateRef]
}] } });
export class DeferModule {
}
DeferModule.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "12.0.4", ngImport: i0, type: DeferModule, deps: [], target: i0.ɵɵFactoryTarget.NgModule });
DeferModule.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "12.0.0", version: "12.0.4", ngImport: i0, type: DeferModule, declarations: [DeferredLoader], imports: [CommonModule], exports: [DeferredLoader] });
DeferModule.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "12.0.4", ngImport: i0, type: DeferModule, imports: [[CommonModule]] });
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "12.0.4", ngImport: i0, type: DeferModule, decorators: [{
type: NgModule,
args: [{
imports: [CommonModule],
exports: [DeferredLoader],
declarations: [DeferredLoader]
}]
}] });
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