@tanstack/query-core/build/modern/focusManager.js

The framework agnostic core that powers TanStack Query

import { Subscribable } from "./subscribable.js";
//#region src/focusManager.ts
var FocusManager = class extends Subscribable {
	#focused;
	#cleanup;
	#setup;
	constructor() {
		super();
		this.#setup = (onFocus) => {
			if (typeof window !== "undefined" && window.addEventListener) {
				const listener = () => onFocus();
				window.addEventListener("visibilitychange", listener, false);
				return () => {
					window.removeEventListener("visibilitychange", listener);
				};
			}
		};
	}
	onSubscribe() {
		if (!this.#cleanup) this.setEventListener(this.#setup);
	}
	onUnsubscribe() {
		if (!this.hasListeners()) {
			this.#cleanup?.();
			this.#cleanup = void 0;
		}
	}
	setEventListener(setup) {
		this.#setup = setup;
		this.#cleanup?.();
		this.#cleanup = setup((focused) => {
			if (typeof focused === "boolean") this.setFocused(focused);
			else this.onFocus();
		});
	}
	setFocused(focused) {
		if (this.#focused !== focused) {
			this.#focused = focused;
			this.onFocus();
		}
	}
	onFocus() {
		const isFocused = this.isFocused();
		this.listeners.forEach((listener) => {
			listener(isFocused);
		});
	}
	isFocused() {
		if (typeof this.#focused === "boolean") return this.#focused;
		return globalThis.document?.visibilityState !== "hidden";
	}
};
const focusManager = new FocusManager();
//#endregion
export { FocusManager, focusManager };

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