fix(List): calling onLoadMore function while using keyboard (#1284)

Author: kkirik

src/components/List/List.tsx

@@ -93,7 +93,7 @@ export class List<T = unknown> extends React.Component<ListProps<T>, ListState<T
     refFilter = React.createRef<HTMLInputElement>();
     refContainer = React.createRef<any>();
     blurTimer: ReturnType<typeof setTimeout> | null = null;
-    loadingItem = {value: '__LIST_ITEM_LOADING__', disabled: true} as unknown as ListItemData<
+    loadingItem = {value: '__LIST_ITEM_LOADING__', disabled: false} as unknown as ListItemData<
         T & {value: string}
     >;
     uniqId = getUniqId();
@@ -518,11 +518,13 @@ export class List<T = unknown> extends React.Component<ListProps<T>, ListState<T
     };
 
     private handleKeyMove(event: React.KeyboardEvent, step: number, defaultItemIndex = 0) {
-        event.preventDefault();
         const {activeItem = defaultItemIndex} = this.state;
-        this.activateItem(
-            List.findNextIndex<T>(this.state.items, activeItem + step, Math.sign(step)),
-        );
+
+        event.preventDefault();
+
+        const items = this.getItemsWithLoading();
+
+        this.activateItem(List.findNextIndex<T>(items, activeItem + step, Math.sign(step)));
     }
 
     private handleFocus = () => {

src/components/List/__stories__/List.stories.tsx

@@ -6,6 +6,7 @@ import {List, listDefaultProps} from '..';
 import type {ListProps} from '..';
 
 import {ListShowcase} from './ListShowcase';
+import {ListWithLoader} from './ListWithLoader';
 
 type ComponentType = React.JSXElementConstructor<ListProps<string>>;
 
@@ -44,7 +45,17 @@ export const RenderItem = RenderItemTemplate.bind({});
 RenderItem.args = {
     items,
     renderItem: (item) => `🔥🔥🔥 ${item} 🔥🔥🔥`,
+};
+
+const TemplateWithState: ComponentStory<ComponentType> = (args) => <ListWithLoader {...args} />;
+
+export const WithLoadingMoreItems = TemplateWithState.bind({});
+WithLoadingMoreItems.args = {
+    items: ['one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight'],
     itemsHeight: 150,
+    itemHeight: 28,
+    loading: true,
+    virtualized: false,
 };
 
 const ShowcaseTemplate: ComponentStory<ComponentType> = () => <ListShowcase />;

src/components/List/__stories__/ListWithLoader.scss

@@ -0,0 +1,6 @@
+@use '../../variables';
+@use '../../../../styles/mixins';
+
+.list-with-loader {
+    overflow: auto;
+}

src/components/List/__stories__/ListWithLoader.tsx

@@ -0,0 +1,26 @@
+import React from 'react';
+
+import {cn} from '../../utils/cn';
+import {List} from '../List';
+import type {ListProps} from '../types';
+
+import './ListWithLoader.scss';
+
+const b = cn('list-with-loader');
+
+export const ListWithLoader = (args: ListProps<string>) => {
+    const [items, setItems] = React.useState(args.items);
+
+    const onLoadMore = () => {
+        // delay for fetching new real items
+        setTimeout(() => {
+            setItems([...items, ...args.items]);
+        }, 300);
+    };
+
+    return (
+        <div className={b()}>
+            <List {...args} items={items} onLoadMore={onLoadMore} />
+        </div>
+    );
+};