frontend-svelte/src/entities/Font/ui/FontVirtualList/FontVirtualList.stories.svelte

<script module>
import { defineMeta } from '@storybook/addon-svelte-csf';
import FontVirtualList from './FontVirtualList.svelte';

const { Story } = defineMeta({
    title: 'Entities/FontVirtualList',
    component: FontVirtualList,
    tags: ['autodocs'],
    parameters: {
        docs: {
            description: {
                component:
                    'Virtualized font list backed by the `fontCatalogStore` singleton. Handles font loading registration (pin/touch) for visible items and triggers infinite scroll pagination via `fontCatalogStore.nextPage()`. Because the component reads directly from the `fontCatalogStore` singleton, stories render against a live (but empty/loading) store — no font data will appear unless the API is reachable from the Storybook host.',
            },
            story: { inline: false },
        },
        layout: 'padded',
    },
    argTypes: {
        weight: { control: 'number', description: 'Font weight applied to visible fonts' },
        itemHeight: { control: 'number', description: 'Height of each list item in pixels' },
    },
});
</script>

<script lang="ts">
import type { ComponentProps } from 'svelte';
</script>

<Story
    name="Loading Skeleton"
    parameters={{
        docs: {
            description: {
                story:
                    'Skeleton state shown while `fontCatalogStore.fonts` is empty and `fontCatalogStore.isLoading` is true. In a real session the skeleton fades out once the first page loads.',
            },
        },
    }}
    args={{ weight: 400, itemHeight: 72 }}
>
    {#snippet template(args: ComponentProps<typeof FontVirtualList>)}
        <div class="h-[400px] w-full">
            <FontVirtualList {...args}>
                {#snippet skeleton()}
                    <div class="flex flex-col gap-2 p-4">
                        {#each Array(6) as _}
                            <div class="h-16 animate-pulse rounded bg-neutral-200"></div>
                        {/each}
                    </div>
                {/snippet}
                {#snippet children({ item })}
                    <div class="border-b border-neutral-100 p-3">{item.name}</div>
                {/snippet}
            </FontVirtualList>
        </div>
    {/snippet}
</Story>

<Story
    name="Empty State"
    parameters={{
        docs: {
            description: {
                story:
                    'No `skeleton` snippet provided. When `fontCatalogStore.fonts` is empty the underlying VirtualList renders its empty state directly.',
            },
        },
    }}
    args={{ weight: 400, itemHeight: 72 }}
>
    {#snippet template(args: ComponentProps<typeof FontVirtualList>)}
        <div class="h-[400px] w-full">
            <FontVirtualList {...args}>
                {#snippet children({ item })}
                    <div class="border-b border-neutral-100 p-3">{item.name}</div>
                {/snippet}
            </FontVirtualList>
        </div>
    {/snippet}
</Story>

<Story
    name="With Item Renderer"
    parameters={{
        docs: {
            description: {
                story:
                    'Demonstrates how to configure a `children` snippet for item rendering. The list will be empty because `fontCatalogStore` is not populated in Storybook, but the template shows the expected slot shape: `{ item: UnifiedFont }`.',
            },
        },
    }}
    args={{ weight: 400, itemHeight: 80 }}
>
    {#snippet template(args: ComponentProps<typeof FontVirtualList>)}
        <div class="h-[400px] w-full">
            <FontVirtualList {...args}>
                {#snippet skeleton()}
                    <div class="flex flex-col gap-2 p-4">
                        {#each Array(6) as _}
                            <div class="h-16 animate-pulse rounded bg-neutral-200"></div>
                        {/each}
                    </div>
                {/snippet}
                {#snippet children({ item })}
                    <div class="flex items-center justify-between border-b border-neutral-100 px-4 py-3">
                        <span class="text-sm font-medium">{item.name}</span>
                        <span class="text-xs text-neutral-400">{item.category}</span>
                    </div>
                {/snippet}
            </FontVirtualList>
        </div>
    {/snippet}
</Story>