forked from MapComplete/MapComplete
30 lines
No EOL
867 B
TypeScript
30 lines
No EOL
867 B
TypeScript
import {UIEventSource} from "../UIEventSource";
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import {LicenseInfo} from "./Wikimedia";
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import BaseUIElement from "../../UI/BaseUIElement";
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export default abstract class ImageAttributionSource {
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private _cache = new Map<string, UIEventSource<LicenseInfo>>()
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GetAttributionFor(url: string): UIEventSource<LicenseInfo> {
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const cached = this._cache.get(url);
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if (cached !== undefined) {
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return cached;
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}
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const src = this.DownloadAttribution(url)
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this._cache.set(url, src)
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return src;
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}
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public abstract SourceIcon(backlinkSource?: string): BaseUIElement;
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/*Converts a value to a URL. Can return null if not applicable*/
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public PrepareUrl(value: string): string {
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return value;
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}
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protected abstract DownloadAttribution(url: string): UIEventSource<LicenseInfo>;
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} |