Initial commit

node_modules/react-remove-scroll/dist/es2019/handleScroll.js

@@ -0,0 +1,95 @@
+const alwaysContainsScroll = (node) => 
+// textarea will always _contain_ scroll inside self. It only can be hidden
+node.tagName === 'TEXTAREA';
+const elementCanBeScrolled = (node, overflow) => {
+    if (!(node instanceof Element)) {
+        return false;
+    }
+    const styles = window.getComputedStyle(node);
+    return (
+    // not-not-scrollable
+    styles[overflow] !== 'hidden' &&
+        // contains scroll inside self
+        !(styles.overflowY === styles.overflowX && !alwaysContainsScroll(node) && styles[overflow] === 'visible'));
+};
+const elementCouldBeVScrolled = (node) => elementCanBeScrolled(node, 'overflowY');
+const elementCouldBeHScrolled = (node) => elementCanBeScrolled(node, 'overflowX');
+export const locationCouldBeScrolled = (axis, node) => {
+    const ownerDocument = node.ownerDocument;
+    let current = node;
+    do {
+        // Skip over shadow root
+        if (typeof ShadowRoot !== 'undefined' && current instanceof ShadowRoot) {
+            current = current.host;
+        }
+        const isScrollable = elementCouldBeScrolled(axis, current);
+        if (isScrollable) {
+            const [, scrollHeight, clientHeight] = getScrollVariables(axis, current);
+            if (scrollHeight > clientHeight) {
+                return true;
+            }
+        }
+        current = current.parentNode;
+    } while (current && current !== ownerDocument.body);
+    return false;
+};
+const getVScrollVariables = ({ scrollTop, scrollHeight, clientHeight }) => [
+    scrollTop,
+    scrollHeight,
+    clientHeight,
+];
+const getHScrollVariables = ({ scrollLeft, scrollWidth, clientWidth }) => [
+    scrollLeft,
+    scrollWidth,
+    clientWidth,
+];
+const elementCouldBeScrolled = (axis, node) => axis === 'v' ? elementCouldBeVScrolled(node) : elementCouldBeHScrolled(node);
+const getScrollVariables = (axis, node) => axis === 'v' ? getVScrollVariables(node) : getHScrollVariables(node);
+const getDirectionFactor = (axis, direction) => 
+/**
+ * If the element's direction is rtl (right-to-left), then scrollLeft is 0 when the scrollbar is at its rightmost position,
+ * and then increasingly negative as you scroll towards the end of the content.
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollLeft
+ */
+axis === 'h' && direction === 'rtl' ? -1 : 1;
+export const handleScroll = (axis, endTarget, event, sourceDelta, noOverscroll) => {
+    const directionFactor = getDirectionFactor(axis, window.getComputedStyle(endTarget).direction);
+    const delta = directionFactor * sourceDelta;
+    // find scrollable target
+    let target = event.target;
+    const targetInLock = endTarget.contains(target);
+    let shouldCancelScroll = false;
+    const isDeltaPositive = delta > 0;
+    let availableScroll = 0;
+    let availableScrollTop = 0;
+    do {
+        const [position, scroll, capacity] = getScrollVariables(axis, target);
+        const elementScroll = scroll - capacity - directionFactor * position;
+        if (position || elementScroll) {
+            if (elementCouldBeScrolled(axis, target)) {
+                availableScroll += elementScroll;
+                availableScrollTop += position;
+            }
+        }
+        if (target instanceof ShadowRoot) {
+            target = target.host;
+        }
+        else {
+            target = target.parentNode;
+        }
+    } while (
+    // portaled content
+    (!targetInLock && target !== document.body) ||
+        // self content
+        (targetInLock && (endTarget.contains(target) || endTarget === target)));
+    // handle epsilon around 0 (non standard zoom levels)
+    if (isDeltaPositive &&
+        ((noOverscroll && Math.abs(availableScroll) < 1) || (!noOverscroll && delta > availableScroll))) {
+        shouldCancelScroll = true;
+    }
+    else if (!isDeltaPositive &&
+        ((noOverscroll && Math.abs(availableScrollTop) < 1) || (!noOverscroll && -delta > availableScrollTop))) {
+        shouldCancelScroll = true;
+    }
+    return shouldCancelScroll;
+};