INIT

node_modules/runed/dist/utilities/use-intersection-observer/use-intersection-observer.svelte.js

@@ -0,0 +1,49 @@
+import { extract } from "../extract/extract.svelte.js";
+import { get } from "../../internal/utils/get.js";
+import { defaultWindow } from "../../internal/configurable-globals.js";
+/**
+ * Watch for intersection changes of a target element.
+ *
+ * @see https://runed.dev/docs/utilities/useIntersectionObserver
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver IntersectionObserver MDN
+ */
+export function useIntersectionObserver(target, callback, options = {}) {
+    const { root, rootMargin = "0px", threshold = 0.1, immediate = true, window = defaultWindow, } = options;
+    let isActive = $state(immediate);
+    let observer;
+    const targets = $derived.by(() => {
+        const value = extract(target);
+        return new Set(value ? (Array.isArray(value) ? value : [value]) : []);
+    });
+    const stop = $effect.root(() => {
+        $effect(() => {
+            if (!targets.size || !isActive || !window)
+                return;
+            observer = new window.IntersectionObserver(callback, {
+                rootMargin,
+                root: get(root),
+                threshold,
+            });
+            for (const el of targets)
+                observer.observe(el);
+            return () => {
+                observer?.disconnect();
+            };
+        });
+    });
+    $effect(() => {
+        return stop;
+    });
+    return {
+        get isActive() {
+            return isActive;
+        },
+        stop,
+        pause() {
+            isActive = false;
+        },
+        resume() {
+            isActive = true;
+        },
+    };
+}