mapcomplete/UI/Base/LazyElement.ts
2021-03-09 13:10:48 +01:00

36 lines
No EOL
966 B
TypeScript

import {UIElement} from "../UIElement";
export default class LazyElement extends UIElement {
public Activate: () => void;
private _content: UIElement = undefined;
private readonly _loadingContent: string;
constructor(content: (() => UIElement), loadingContent = "Rendering...") {
super();
this._loadingContent = loadingContent;
this.dumbMode = false;
const self = this;
this.Activate = () => {
if (this._content === undefined) {
self._content = content();
}
self.Update();
// @ts-ignore
if (this._content.Activate) {
// THis is ugly - I know
// @ts-ignore
this._content.Activate();
}
}
}
InnerRender(): string {
if (this._content === undefined) {
return this._loadingContent;
}
return this._content.Render();
}
}