59 lines
2.0 KiB
TypeScript
59 lines
2.0 KiB
TypeScript
import { InjectionToken, Inject, Injectable } from '@angular/core';
|
|
import { of } from 'rxjs/observable/of';
|
|
import { MatIconRegistry } from '@angular/material/icon';
|
|
import { HttpClient } from '@angular/common/http';
|
|
import { DomSanitizer } from '@angular/platform-browser';
|
|
|
|
/**
|
|
* Use SVG_ICONS (and SvgIconInfo) as "multi" providers to provide the SVG source
|
|
* code for the icons that you wish to have preloaded in the `CustomIconRegistry`
|
|
* For compatibility with the MdIconComponent, please ensure that the SVG source has
|
|
* the following attributes:
|
|
*
|
|
* * `xmlns="http://www.w3.org/2000/svg"`
|
|
* * `focusable="false"` (disable IE11 default behavior to make SVGs focusable)
|
|
* * `height="100%"` (the default)
|
|
* * `width="100%"` (the default)
|
|
* * `preserveAspectRatio="xMidYMid meet"` (the default)
|
|
*
|
|
*/
|
|
export const SVG_ICONS = new InjectionToken<Array<SvgIconInfo>>('SvgIcons');
|
|
export interface SvgIconInfo {
|
|
name: string;
|
|
svgSource: string;
|
|
}
|
|
|
|
interface SvgIconMap {
|
|
[iconName: string]: SVGElement;
|
|
}
|
|
|
|
/**
|
|
* A custom replacement for Angular Material's `MdIconRegistry`, which allows
|
|
* us to provide preloaded icon SVG sources.
|
|
*/
|
|
@Injectable()
|
|
export class CustomIconRegistry extends MatIconRegistry {
|
|
private preloadedSvgElements: SvgIconMap = {};
|
|
|
|
constructor(http: HttpClient, sanitizer: DomSanitizer, @Inject(SVG_ICONS) svgIcons: SvgIconInfo[]) {
|
|
super(http, sanitizer);
|
|
this.loadSvgElements(svgIcons);
|
|
}
|
|
|
|
getNamedSvgIcon(iconName: string, namespace?: string) {
|
|
if (this.preloadedSvgElements[iconName]) {
|
|
return of(this.preloadedSvgElements[iconName].cloneNode(true) as SVGElement);
|
|
}
|
|
return super.getNamedSvgIcon(iconName, namespace);
|
|
}
|
|
|
|
private loadSvgElements(svgIcons: SvgIconInfo[]) {
|
|
const div = document.createElement('DIV');
|
|
svgIcons.forEach(icon => {
|
|
// SECURITY: the source for the SVG icons is provided in code by trusted developers
|
|
div.innerHTML = icon.svgSource;
|
|
this.preloadedSvgElements[icon.name] = div.querySelector('svg')!;
|
|
});
|
|
}
|
|
}
|