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frontend/node_modules/rc-virtual-list/es/hooks/useFrameWheel.js

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+import raf from "rc-util/es/raf";
+import { useRef } from 'react';
+import isFF from "../utils/isFirefox";
+import useOriginScroll from "./useOriginScroll";
+export default function useFrameWheel(inVirtual, isScrollAtTop, isScrollAtBottom, isScrollAtLeft, isScrollAtRight, horizontalScroll,
+/***
+ * Return `true` when you need to prevent default event
+ */
+onWheelDelta) {
+  var offsetRef = useRef(0);
+  var nextFrameRef = useRef(null);
+
+  // Firefox patch
+  var wheelValueRef = useRef(null);
+  var isMouseScrollRef = useRef(false);
+
+  // Scroll status sync
+  var originScroll = useOriginScroll(isScrollAtTop, isScrollAtBottom, isScrollAtLeft, isScrollAtRight);
+  function onWheelY(e, deltaY) {
+    raf.cancel(nextFrameRef.current);
+
+    // Do nothing when scroll at the edge, Skip check when is in scroll
+    if (originScroll(false, deltaY)) return;
+
+    // Skip if nest List has handled this event
+    var event = e;
+    if (!event._virtualHandled) {
+      event._virtualHandled = true;
+    } else {
+      return;
+    }
+    offsetRef.current += deltaY;
+    wheelValueRef.current = deltaY;
+
+    // Proxy of scroll events
+    if (!isFF) {
+      event.preventDefault();
+    }
+    nextFrameRef.current = raf(function () {
+      // Patch a multiple for Firefox to fix wheel number too small
+      // ref: https://github.com/ant-design/ant-design/issues/26372#issuecomment-679460266
+      var patchMultiple = isMouseScrollRef.current ? 10 : 1;
+      onWheelDelta(offsetRef.current * patchMultiple, false);
+      offsetRef.current = 0;
+    });
+  }
+  function onWheelX(event, deltaX) {
+    onWheelDelta(deltaX, true);
+    if (!isFF) {
+      event.preventDefault();
+    }
+  }
+
+  // Check for which direction does wheel do. `sx` means `shift + wheel`
+  var wheelDirectionRef = useRef(null);
+  var wheelDirectionCleanRef = useRef(null);
+  function onWheel(event) {
+    if (!inVirtual) return;
+
+    // Wait for 2 frame to clean direction
+    raf.cancel(wheelDirectionCleanRef.current);
+    wheelDirectionCleanRef.current = raf(function () {
+      wheelDirectionRef.current = null;
+    }, 2);
+    var deltaX = event.deltaX,
+      deltaY = event.deltaY,
+      shiftKey = event.shiftKey;
+    var mergedDeltaX = deltaX;
+    var mergedDeltaY = deltaY;
+    if (wheelDirectionRef.current === 'sx' || !wheelDirectionRef.current && (shiftKey || false) && deltaY && !deltaX) {
+      mergedDeltaX = deltaY;
+      mergedDeltaY = 0;
+      wheelDirectionRef.current = 'sx';
+    }
+    var absX = Math.abs(mergedDeltaX);
+    var absY = Math.abs(mergedDeltaY);
+    if (wheelDirectionRef.current === null) {
+      wheelDirectionRef.current = horizontalScroll && absX > absY ? 'x' : 'y';
+    }
+    if (wheelDirectionRef.current === 'y') {
+      onWheelY(event, mergedDeltaY);
+    } else {
+      onWheelX(event, mergedDeltaX);
+    }
+  }
+
+  // A patch for firefox
+  function onFireFoxScroll(event) {
+    if (!inVirtual) return;
+    isMouseScrollRef.current = event.detail === wheelValueRef.current;
+  }
+  return [onWheel, onFireFoxScroll];
+}