first commit

node_modules/framer-motion/dist/es/render/dom/scroll/track.mjs

@@ -0,0 +1,80 @@
+import { resize, frame, cancelFrame, frameData } from 'motion-dom';
+import { noop } from 'motion-utils';
+import { createScrollInfo } from './info.mjs';
+import { createOnScrollHandler } from './on-scroll-handler.mjs';
+
+const scrollListeners = new WeakMap();
+const resizeListeners = new WeakMap();
+const onScrollHandlers = new WeakMap();
+const getEventTarget = (element) => element === document.scrollingElement ? window : element;
+function scrollInfo(onScroll, { container = document.scrollingElement, ...options } = {}) {
+    if (!container)
+        return noop;
+    let containerHandlers = onScrollHandlers.get(container);
+    /**
+     * Get the onScroll handlers for this container.
+     * If one isn't found, create a new one.
+     */
+    if (!containerHandlers) {
+        containerHandlers = new Set();
+        onScrollHandlers.set(container, containerHandlers);
+    }
+    /**
+     * Create a new onScroll handler for the provided callback.
+     */
+    const info = createScrollInfo();
+    const containerHandler = createOnScrollHandler(container, onScroll, info, options);
+    containerHandlers.add(containerHandler);
+    /**
+     * Check if there's a scroll event listener for this container.
+     * If not, create one.
+     */
+    if (!scrollListeners.has(container)) {
+        const measureAll = () => {
+            for (const handler of containerHandlers) {
+                handler.measure(frameData.timestamp);
+            }
+            frame.preUpdate(notifyAll);
+        };
+        const notifyAll = () => {
+            for (const handler of containerHandlers) {
+                handler.notify();
+            }
+        };
+        const listener = () => frame.read(measureAll);
+        scrollListeners.set(container, listener);
+        const target = getEventTarget(container);
+        window.addEventListener("resize", listener, { passive: true });
+        if (container !== document.documentElement) {
+            resizeListeners.set(container, resize(container, listener));
+        }
+        target.addEventListener("scroll", listener, { passive: true });
+        listener();
+    }
+    const listener = scrollListeners.get(container);
+    frame.read(listener, false, true);
+    return () => {
+        cancelFrame(listener);
+        /**
+         * Check if we even have any handlers for this container.
+         */
+        const currentHandlers = onScrollHandlers.get(container);
+        if (!currentHandlers)
+            return;
+        currentHandlers.delete(containerHandler);
+        if (currentHandlers.size)
+            return;
+        /**
+         * If no more handlers, remove the scroll listener too.
+         */
+        const scrollListener = scrollListeners.get(container);
+        scrollListeners.delete(container);
+        if (scrollListener) {
+            getEventTarget(container).removeEventListener("scroll", scrollListener);
+            resizeListeners.get(container)?.();
+            window.removeEventListener("resize", scrollListener);
+        }
+    };
+}
+
+export { scrollInfo };