27 lines
No EOL
822 B
TypeScript
27 lines
No EOL
822 B
TypeScript
import BaseUIElement from "../BaseUIElement";
|
|
import {VariableUiElement} from "./VariableUIElement";
|
|
import {Stores, UIEventSource} from "../../Logic/UIEventSource";
|
|
import Loading from "./Loading";
|
|
|
|
export default class AsyncLazy extends BaseUIElement {
|
|
private readonly _f: () => Promise<BaseUIElement>;
|
|
|
|
constructor(f: () => Promise<BaseUIElement>) {
|
|
super();
|
|
this._f = f;
|
|
}
|
|
|
|
protected InnerConstructElement(): HTMLElement {
|
|
// The caching of the BaseUIElement will guarantee that _f will only be called once
|
|
|
|
return new VariableUiElement(
|
|
Stores.FromPromise(this._f()).map(el => {
|
|
if (el === undefined) {
|
|
return new Loading()
|
|
}
|
|
return el
|
|
})
|
|
).ConstructElement()
|
|
}
|
|
|
|
} |