feat(Toc): add component

src/components/Toc/Toc.scss

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+@use '../variables';
+@use '../../../styles/mixins.scss';
+
+$block: '.#{variables.$ns-new}toc';
+
+#{$block} {
+    &__title {
+        @include mixins.text-body-2();
+
+        color: var(--g-color-text-primary);
+        margin-bottom: 12px;
+    }
+
+    &__sections,
+    &__subsections {
+        padding: 0;
+        margin: 0;
+
+        overflow-y: auto;
+        overflow-x: hidden;
+
+        list-style: none;
+    }
+}

src/components/Toc/Toc.tsx

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+import React from 'react';
+
+import type {QAProps} from '../types';
+import {blockNew} from '../utils/cn';
+
+import {TocItem} from './TocItem/TocItem';
+import type {TocItem as TocItemType} from './types';
+
+import './Toc.scss';
+
+const b = blockNew('toc');
+
+export interface TocProps extends QAProps {
+    className?: string;
+    value?: string;
+    onUpdate?: (value: string) => void;
+    items: TocItemType[];
+}
+
+export const Toc = React.forwardRef<HTMLElement, TocProps>(function Toc(props, ref) {
+    const {value: activeValue, items, className, onUpdate, qa} = props;
+
+    return (
+        <nav className={b(null, className)} ref={ref} data-qa={qa}>
+            <ul className={b('sections')}>
+                {items.map(({value, content, href, items: childrenItems}) => (
+                    <li key={value ?? href}>
+                        <TocItem
+                            content={content}
+                            value={value}
+                            href={href}
+                            active={activeValue === value}
+                            onClick={onUpdate}
+                        />
+                        {childrenItems?.length && (
+                            <ul className={b('subsections')}>
+                                {childrenItems?.map(
+                                    ({
+                                        value: childrenValue,
+                                        content: childrenContent,
+                                        href: childrenHref,
+                                    }) => (
+                                        <li key={childrenValue ?? childrenHref}>
+                                            <TocItem
+                                                content={childrenContent}
+                                                value={childrenValue}
+                                                href={childrenHref}
+                                                childItem={true}
+                                                active={activeValue === childrenValue}
+                                                onClick={onUpdate}
+                                            />
+                                        </li>
+                                    ),
+                                )}
+                            </ul>
+                        )}
+                    </li>
+                ))}
+            </ul>
+        </nav>
+    );
+});

src/components/Toc/TocItem/TocItem.scss

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+@use '../../variables';
+
+$block: '.#{variables.$ns-new}toc-item';
+
+#{$block} {
+    $class: &;
+
+    &__section {
+        cursor: pointer;
+
+        & > #{$class}__section-link {
+            border-left-color: var(--g-color-line-generic);
+        }
+
+        &-link {
+            &:focus {
+                outline: 2px solid var(--g-color-line-focus);
+                outline-offset: -2px;
+
+                &:focus-visible {
+                    border-radius: calc(var(--g-focus-border-radius) + 2px);
+                }
+            }
+
+            &:focus:not(:focus-visible) {
+                outline: none;
+            }
+
+            display: flex;
+            align-items: center;
+            padding: 6px 6px 6px 12px;
+            min-height: 28px;
+
+            color: var(--g-color-text-secondary);
+            border-left: 2px solid transparent;
+            text-decoration: none;
+
+            &:hover {
+                color: var(--g-color-text-complementary);
+            }
+        }
+
+        &_child {
+            #{$class}__section-link {
+                padding-left: 25px;
+            }
+        }
+
+        &_active > #{$class}__section-link {
+            color: var(--g-color-text-primary);
+            border-left-color: var(--g-color-line-brand);
+        }
+    }
+}

src/components/Toc/TocItem/TocItem.tsx

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+import React from 'react';
+
+import {blockNew} from '../../utils/cn';
+import {useActionHandlers} from '../../utils/useActionHandlers';
+import type {TocItem as TocItemType} from '../types';
+
+import './TocItem.scss';
+
+const b = blockNew('toc-item');
+
+export interface TocItemProps extends TocItemType {
+    childItem?: boolean;
+    active?: boolean;
+    onClick?: (value: string) => void;
+}
+
+export const TocItem = (props: TocItemProps) => {
+    const {active = false, childItem = false, content, href, value, onClick} = props;
+
+    const handleClick = React.useCallback(() => {
+        if (value === undefined || !onClick) {
+            return;
+        }
+
+        onClick(value);
+    }, [onClick, value]);
+
+    const {onKeyDown} = useActionHandlers(handleClick);
+
+    const item =
+        href === undefined ? (
+            <div
+                role="button"
+                tabIndex={0}
+                className={b('section-link')}
+                onClick={handleClick}
+                onKeyDown={onKeyDown}
+            >
+                {content}
+            </div>
+        ) : (
+            <a href={href} onClick={handleClick} className={b('section-link')}>
+                {content}
+            </a>
+        );
+
+    return <div className={b('section', {child: childItem, active})}>{item}</div>;
+};

src/components/Toc/__stories__/Toc.stories.scss

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+@use '../../variables';
+
+$block: '.#{variables.$ns-new}toc-stories';
+
+#{$block} {
+    $class: &;
+
+    max-width: 156px;
+}

src/components/Toc/__stories__/Toc.stories.tsx

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+import React from 'react';
+
+import type {Meta, StoryFn} from '@storybook/react';
+
+import {block} from '../../utils/cn';
+import {Toc, TocProps} from '../Toc';
+
+import './Toc.stories.scss';
+
+const b = block('toc-stories');
+
+export default {
+    title: 'Components/Toc',
+    component: Toc,
+    argTypes: {},
+} as Meta;
+
+const DefaultTemplate: StoryFn<TocProps> = (args) => {
+    const [active, setActive] = React.useState('control');
+
+    return <Toc {...args} value={active} onUpdate={(value: string) => setActive(value)} />;
+};
+
+export const Default = DefaultTemplate.bind({});
+Default.args = {
+    items: [
+        {
+            value: 'vm',
+            content: 'Virtual machine creation',
+        },
+        {
+            value: 'info',
+            content: 'Getting information about a group of virtual machines',
+        },
+        {
+            value: 'disk',
+            content: 'Disk',
+            items: [
+                {
+                    value: 'control',
+                    content: 'Disk controls',
+                },
+                {
+                    value: 'snapshots',
+                    content: 'Disk snapshots',
+                },
+            ],
+        },
+        {
+            value: 'images',
+            content: 'Images with preinstalled software',
+        },
+    ],
+    className: b(),
+};
+
+const WithLinksTemplate: StoryFn<TocProps> = (args) => {
+    const [active, setActive] = React.useState('control');
+
+    return <Toc {...args} value={active} onUpdate={(value: string) => setActive(value)} />;
+};
+
+export const WithLinks = WithLinksTemplate.bind({});
+WithLinks.args = {
+    items: [
+        {
+            value: 'vm',
+            content: 'Virtual machine creation',
+            href: '#vm',
+        },
+        {
+            value: 'info',
+            content: 'Getting information about a group of virtual machines',
+            href: '#info',
+        },
+        {
+            value: 'disk',
+            content: 'Disk',
+            href: '#disk',
+            items: [
+                {
+                    value: 'control',
+                    content: 'Disk controls',
+                    href: '#control',
+                },
+                {
+                    value: 'snapshots',
+                    content: 'Disk snapshots',
+                    href: '#snapshots',
+                },
+            ],
+        },
+        {
+            value: 'images',
+            content: 'Images with preinstalled software',
+            href: '#images',
+        },
+    ],
+    className: b(),
+};