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node_modules/svelte/src/reactivity/window/index.js

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+import { BROWSER, DEV } from 'esm-env';
+import { on } from '../../events/index.js';
+import { ReactiveValue } from '../reactive-value.js';
+import { get } from '../../internal/client/index.js';
+import { set, source } from '../../internal/client/reactivity/sources.js';
+import { tag } from '../../internal/client/dev/tracing.js';
+
+/**
+ * `scrollX.current` is a reactive view of `window.scrollX`. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const scrollX = new ReactiveValue(
+	BROWSER ? () => window.scrollX : () => undefined,
+	(update) => on(window, 'scroll', update)
+);
+
+/**
+ * `scrollY.current` is a reactive view of `window.scrollY`. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const scrollY = new ReactiveValue(
+	BROWSER ? () => window.scrollY : () => undefined,
+	(update) => on(window, 'scroll', update)
+);
+
+/**
+ * `innerWidth.current` is a reactive view of `window.innerWidth`. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const innerWidth = new ReactiveValue(
+	BROWSER ? () => window.innerWidth : () => undefined,
+	(update) => on(window, 'resize', update)
+);
+
+/**
+ * `innerHeight.current` is a reactive view of `window.innerHeight`. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const innerHeight = new ReactiveValue(
+	BROWSER ? () => window.innerHeight : () => undefined,
+	(update) => on(window, 'resize', update)
+);
+
+/**
+ * `outerWidth.current` is a reactive view of `window.outerWidth`. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const outerWidth = new ReactiveValue(
+	BROWSER ? () => window.outerWidth : () => undefined,
+	(update) => on(window, 'resize', update)
+);
+
+/**
+ * `outerHeight.current` is a reactive view of `window.outerHeight`. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const outerHeight = new ReactiveValue(
+	BROWSER ? () => window.outerHeight : () => undefined,
+	(update) => on(window, 'resize', update)
+);
+
+/**
+ * `screenLeft.current` is a reactive view of `window.screenLeft`. It is updated inside a `requestAnimationFrame` callback. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const screenLeft = new ReactiveValue(
+	BROWSER ? () => window.screenLeft : () => undefined,
+	(update) => {
+		let value = window.screenLeft;
+
+		let frame = requestAnimationFrame(function check() {
+			frame = requestAnimationFrame(check);
+
+			if (value !== (value = window.screenLeft)) {
+				update();
+			}
+		});
+
+		return () => {
+			cancelAnimationFrame(frame);
+		};
+	}
+);
+
+/**
+ * `screenTop.current` is a reactive view of `window.screenTop`. It is updated inside a `requestAnimationFrame` callback. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const screenTop = new ReactiveValue(
+	BROWSER ? () => window.screenTop : () => undefined,
+	(update) => {
+		let value = window.screenTop;
+
+		let frame = requestAnimationFrame(function check() {
+			frame = requestAnimationFrame(check);
+
+			if (value !== (value = window.screenTop)) {
+				update();
+			}
+		});
+
+		return () => {
+			cancelAnimationFrame(frame);
+		};
+	}
+);
+
+/**
+ * `online.current` is a reactive view of `navigator.onLine`. On the server it is `undefined`.
+ * @since 5.11.0
+ */
+export const online = new ReactiveValue(
+	BROWSER ? () => navigator.onLine : () => undefined,
+	(update) => {
+		const unsub_online = on(window, 'online', update);
+		const unsub_offline = on(window, 'offline', update);
+		return () => {
+			unsub_online();
+			unsub_offline();
+		};
+	}
+);
+
+/**
+ * `devicePixelRatio.current` is a reactive view of `window.devicePixelRatio`. On the server it is `undefined`.
+ * Note that behaviour differs between browsers — on Chrome it will respond to the current zoom level,
+ * on Firefox and Safari it won't.
+ * @type {{ get current(): number | undefined }}
+ * @since 5.11.0
+ */
+export const devicePixelRatio = /* @__PURE__ */ new (class DevicePixelRatio {
+	#dpr = source(BROWSER ? window.devicePixelRatio : undefined);
+
+	#update() {
+		const off = on(
+			window.matchMedia(`(resolution: ${window.devicePixelRatio}dppx)`),
+			'change',
+			() => {
+				set(this.#dpr, window.devicePixelRatio);
+
+				off();
+				this.#update();
+			}
+		);
+	}
+
+	constructor() {
+		if (BROWSER) {
+			this.#update();
+		}
+
+		if (DEV) {
+			tag(this.#dpr, 'window.devicePixelRatio');
+		}
+	}
+
+	get current() {
+		get(this.#dpr);
+		return BROWSER ? window.devicePixelRatio : undefined;
+	}
+})();