main repo

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

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+import { progress, velocityPerSecond } from 'motion-utils';
+
+/**
+ * A time in milliseconds, beyond which we consider the scroll velocity to be 0.
+ */
+const maxElapsed = 50;
+const createAxisInfo = () => ({
+    current: 0,
+    offset: [],
+    progress: 0,
+    scrollLength: 0,
+    targetOffset: 0,
+    targetLength: 0,
+    containerLength: 0,
+    velocity: 0,
+});
+const createScrollInfo = () => ({
+    time: 0,
+    x: createAxisInfo(),
+    y: createAxisInfo(),
+});
+const keys = {
+    x: {
+        length: "Width",
+        position: "Left",
+    },
+    y: {
+        length: "Height",
+        position: "Top",
+    },
+};
+function updateAxisInfo(element, axisName, info, time) {
+    const axis = info[axisName];
+    const { length, position } = keys[axisName];
+    const prev = axis.current;
+    const prevTime = info.time;
+    axis.current = element[`scroll${position}`];
+    axis.scrollLength = element[`scroll${length}`] - element[`client${length}`];
+    axis.offset.length = 0;
+    axis.offset[0] = 0;
+    axis.offset[1] = axis.scrollLength;
+    axis.progress = progress(0, axis.scrollLength, axis.current);
+    const elapsed = time - prevTime;
+    axis.velocity =
+        elapsed > maxElapsed
+            ? 0
+            : velocityPerSecond(axis.current - prev, elapsed);
+}
+function updateScrollInfo(element, info, time) {
+    updateAxisInfo(element, "x", info, time);
+    updateAxisInfo(element, "y", info, time);
+    info.time = time;
+}
+
+export { createScrollInfo, updateScrollInfo };