ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
73 lines • 8.95 kB
JavaScript
/**
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { Platform } from '@angular/cdk/platform';
import { DOCUMENT } from '@angular/common';
import { Inject, Injectable } from '@angular/core';
import * as i0 from "@angular/core";
import * as i1 from "@angular/common";
import * as i2 from "@angular/cdk/platform";
export class ImagePreloadService {
constructor(document, platform) {
this.document = document;
this.platform = platform;
this.counter = new Map();
this.linkRefs = new Map();
}
addPreload(option) {
if (this.platform.isBrowser) {
return () => void 0;
}
const uniqueKey = `${option.src}${option.srcset}`;
let currentCount = this.counter.get(uniqueKey) || 0;
currentCount++;
this.counter.set(uniqueKey, currentCount);
if (!this.linkRefs.has(uniqueKey)) {
const linkNode = this.appendPreloadLink(option);
this.linkRefs.set(uniqueKey, linkNode);
}
return () => {
if (this.counter.has(uniqueKey)) {
let count = this.counter.get(uniqueKey);
count--;
if (count === 0) {
const linkNode = this.linkRefs.get(uniqueKey);
this.removePreloadLink(linkNode);
this.counter.delete(uniqueKey);
this.linkRefs.delete(uniqueKey);
}
else {
this.counter.set(uniqueKey, count);
}
}
};
}
appendPreloadLink(option) {
const linkNode = this.document.createElement('link');
linkNode.setAttribute('rel', 'preload');
linkNode.setAttribute('as', 'image');
linkNode.setAttribute('href', option.src);
if (option.srcset) {
linkNode.setAttribute('imagesrcset', option.srcset);
}
this.document.head.appendChild(linkNode);
return linkNode;
}
removePreloadLink(linkNode) {
if (this.document.head.contains(linkNode)) {
this.document.head.removeChild(linkNode);
}
}
}
ImagePreloadService.ɵprov = i0.ɵɵdefineInjectable({ factory: function ImagePreloadService_Factory() { return new ImagePreloadService(i0.ɵɵinject(i1.DOCUMENT), i0.ɵɵinject(i2.Platform)); }, token: ImagePreloadService, providedIn: "root" });
ImagePreloadService.decorators = [
{ type: Injectable, args: [{
providedIn: 'root'
},] }
];
ImagePreloadService.ctorParameters = () => [
{ type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
{ type: Platform }
];
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