feat:Using the showScrollBar property of the List component

src/BaseSelect/index.tsx

@@ -136,7 +136,7 @@ export interface BaseSelectProps extends BaseSelectPrivateProps, React.AriaAttri
   tagRender?: (props: CustomTagProps) => React.ReactElement;
   direction?: 'ltr' | 'rtl';
   maxLength?: number;
-
+  showScrollBar?: boolean | 'optional';
   // MISC
   tabIndex?: number;
   autoFocus?: boolean;
@@ -223,6 +223,7 @@ const BaseSelect = React.forwardRef<BaseSelectRef, BaseSelectProps>((props, ref)
     className,
     showSearch,
     tagRender,
+    showScrollBar = 'optional',
     direction,
     omitDomProps,
 
@@ -693,8 +694,19 @@ const BaseSelect = React.forwardRef<BaseSelectRef, BaseSelectProps>((props, ref)
       showSearch: mergedShowSearch,
       multiple,
       toggleOpen: onToggleOpen,
+      showScrollBar,
     }),
-    [props, notFoundContent, triggerOpen, mergedOpen, id, mergedShowSearch, multiple, onToggleOpen],
+    [
+      props,
+      notFoundContent,
+      triggerOpen,
+      mergedOpen,
+      id,
+      mergedShowSearch,
+      multiple,
+      onToggleOpen,
+      showScrollBar,
+    ],
   );
 
   // ==================================================================

src/OptionList.tsx

@@ -44,6 +44,7 @@ const OptionList: React.ForwardRefRenderFunction<RefOptionListProps, {}> = (_, r
     toggleOpen,
     notFoundContent,
     onPopupScroll,
+    showScrollBar,
   } = useBaseProps();
   const {
     maxCount,
@@ -325,6 +326,7 @@ const OptionList: React.ForwardRefRenderFunction<RefOptionListProps, {}> = (_, r
         virtual={virtual}
         direction={direction}
         innerProps={virtual ? null : a11yProps}
+        showScrollBar={showScrollBar}
       >
         {(item, itemIndex) => {
           const { group, groupOption, data, label, value } = item;

tests/ListScrollBar.test.tsx

@@ -0,0 +1,95 @@
+import React from 'react';
+import { render, waitFor } from '@testing-library/react';
+import { spyElementPrototypes } from './utils/domHook';
+import Select from '../src';
+
+jest.mock('../src/utils/platformUtil');
+// Mock VirtualList
+jest.mock('rc-virtual-list', () => {
+  const OriReact = jest.requireActual('react');
+  const OriList = jest.requireActual('rc-virtual-list').default;
+
+  return OriReact.forwardRef((props, ref) => {
+    const oriRef = OriReact.useRef();
+
+    OriReact.useImperativeHandle(ref, () => ({
+      ...oriRef.current,
+      scrollTo: (arg) => {
+        global.scrollToArgs = arg;
+        oriRef.current.scrollTo(arg);
+      },
+    }));
+
+    return <OriList {...props} ref={oriRef} />;
+  });
+});
+
+describe('List.Scroll', () => {
+  let mockElement;
+  let boundingRect = {
+    top: 0,
+    bottom: 0,
+    width: 100,
+    height: 50,
+  };
+
+  beforeAll(() => {
+    mockElement = spyElementPrototypes(HTMLElement, {
+      offsetHeight: {
+        get: () => 100,
+      },
+      clientHeight: {
+        get: () => 50,
+      },
+      getBoundingClientRect: () => boundingRect,
+      offsetParent: {
+        get: () => document.body,
+      },
+    });
+  });
+
+  afterAll(() => {
+    mockElement.mockRestore();
+  });
+
+  beforeEach(() => {
+    boundingRect = {
+      top: 0,
+      bottom: 0,
+      width: 100,
+      height: 50,
+    };
+    jest.useFakeTimers();
+  });
+
+  afterEach(() => {
+    jest.useRealTimers();
+  });
+
+  it('should show scrollbar when showScrollBar is true', async () => {
+    const options = Array.from({ length: 10 }, (_, index) => ({
+      label: `${index + 1}`,
+      value: `${index + 1}`,
+    }));
+
+    const { container } = render(<Select open showScrollBar options={options} />);
+
+    await waitFor(() => {
+      const scrollbarElement = container.querySelector('.rc-virtual-list-scrollbar-visible');
+      expect(scrollbarElement).not.toBeNull();
+    });
+  });
+  it('should not have scrollbar when showScrollBar is false', async () => {
+    const options = Array.from({ length: 10 }, (_, index) => ({
+      label: `${index + 1}`,
+      value: `${index + 1}`,
+    }));
+
+    const { container } = render(<Select open showScrollBar={false} options={options} />);
+
+    await waitFor(() => {
+      const scrollbarElement = container.querySelector('.rc-virtual-list-scrollbar-visible');
+      expect(scrollbarElement).toBeNull();
+    });
+  });
+});

tests/utils/domHook.ts

@@ -0,0 +1,61 @@
+/* eslint-disable no-param-reassign */
+const NO_EXIST = { __NOT_EXIST: true };
+
+export function spyElementPrototypes(Element, properties) {
+  const propNames = Object.keys(properties);
+  const originDescriptors = {};
+
+  propNames.forEach((propName) => {
+    const originDescriptor = Object.getOwnPropertyDescriptor(Element.prototype, propName);
+    originDescriptors[propName] = originDescriptor || NO_EXIST;
+
+    const spyProp = properties[propName];
+
+    if (typeof spyProp === 'function') {
+      // If is a function
+      Element.prototype[propName] = function spyFunc(...args) {
+        return spyProp.call(this, originDescriptor, ...args);
+      };
+    } else {
+      // Otherwise tread as a property
+      Object.defineProperty(Element.prototype, propName, {
+        ...spyProp,
+        set(value) {
+          if (spyProp.set) {
+            return spyProp.set.call(this, originDescriptor, value);
+          }
+          return originDescriptor.set(value);
+        },
+        get() {
+          if (spyProp.get) {
+            return spyProp.get.call(this, originDescriptor);
+          }
+          return originDescriptor.get();
+        },
+        configurable: true,
+      });
+    }
+  });
+
+  return {
+    mockRestore() {
+      propNames.forEach((propName) => {
+        const originDescriptor = originDescriptors[propName];
+        if (originDescriptor === NO_EXIST) {
+          delete Element.prototype[propName];
+        } else if (typeof originDescriptor === 'function') {
+          Element.prototype[propName] = originDescriptor;
+        } else {
+          Object.defineProperty(Element.prototype, propName, originDescriptor);
+        }
+      });
+    },
+  };
+}
+
+export function spyElementPrototype(Element, propName, property) {
+  return spyElementPrototypes(Element, {
+    [propName]: property,
+  });
+}
+/* eslint-enable no-param-reassign */