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<script lang="ts">
import { Direction, Layout, type PageFragment } from '$gql/graphql';
import { type Chunk, getReaderContext, partition } from '$lib/Reader.svelte';
import { binds } from '$lib/Shortcuts';
import { src } from '$lib/Utils';
import ReaderPage from './ReaderPage.svelte';
import SliderMargin from './components/SliderMargin.svelte';
import SliderTooltip from './components/SliderTooltip.svelte';
const reader = getReaderContext();
let { direction, layout }: { direction: Direction; layout: Layout } = $props();
function gotoChunk(to: number) {
if (to < 0 || to >= chunks.length) return;
reader.page = chunks[to].index;
}
function pagesAround(around: number) {
const pages: PageFragment[] = [];
const push = (at: number) => {
if (at < 0 || at >= chunks.length) return;
pages.push(chunks[at].main);
if (chunks[at].secondary) {
pages.push(chunks[at].secondary);
}
};
for (let i = 1; i <= 2; i++) {
push(lookup[around] + i);
push(lookup[around] - i);
}
return pages;
}
const next = () => gotoChunk(lookup[reader.page] + 1);
const prev = () => gotoChunk(lookup[reader.page] - 1);
const clickLeft = () => (direction === Direction.LeftToRight ? prev() : next());
const clickRight = () => (direction === Direction.RightToLeft ? prev() : next());
function clickMain(event: MouseEvent & { currentTarget: EventTarget | null }) {
if (event.currentTarget instanceof Element) {
const rect = event.currentTarget.getBoundingClientRect();
if (event.clientX - rect.left < rect.width / 2) {
clickLeft();
} else {
clickRight();
}
}
}
let [chunks, lookup] = $derived(partition(reader.pages, layout));
let currentChunk = $derived(chunks[lookup[reader.page]]);
let { main, secondary } = $derived(currentChunk);
let reverse = $derived(direction === Direction.RightToLeft);
</script>
<svelte:document
use:binds={[
['ArrowLeft', clickLeft],
['ArrowRight', clickRight],
['ArrowUp', prev],
['ArrowDown', next],
['PageUp', prev],
['PageDown', next],
[' ', next],
['Backspace', prev],
['Home', () => gotoChunk(0)],
['End', () => gotoChunk(chunks.length - 1)]
]}
/>
{#if !secondary}
<ReaderPage page={main} onclick={clickMain} --justify="center" />
{:else if reverse}
<ReaderPage page={secondary} onclick={next} --justify="flex-end" />
<ReaderPage page={main} onclick={prev} --justify="flex-start" />
{:else}
<ReaderPage page={main} onclick={prev} --justify="flex-end" />
<ReaderPage page={secondary} onclick={next} --justify="flex-start" />
{/if}
{#snippet pagesIn(chunk: Chunk)}
{#if chunk.secondary}
{chunk.index + 1} - {chunk.index + 2}
{:else}
{chunk.index + 1}
{/if}
{/snippet}
<div class="group/slider absolute bottom-0 z-1 flex w-full pt-20">
<div class:reverse class="flex h-1 w-full transition-[height] group-hover/slider:h-8">
<SliderMargin>
{@render pagesIn(currentChunk)}
</SliderMargin>
<div class:reverse class="flex w-full bg-gray-400/60 backdrop-blur-2xl">
{#each chunks as chunk, index}
<button
type="button"
class:read={index <= lookup[reader.page]}
class="group/page relative grow [&.read]:bg-blue-600/60"
onclick={() => reader.open(chunk.index)}
aria-label={`Open page ${chunk.index}`}
>
<SliderTooltip>
{@render pagesIn(chunk)}
</SliderTooltip>
</button>
{/each}
</div>
<SliderMargin>
{reader.pages.length}
</SliderMargin>
</div>
</div>
<div class="invisible absolute">
{#each pagesAround(reader.page) as page}
<img src={src(page.image, 'full')} alt="" />
{/each}
</div>
<style>
.reverse {
flex-direction: row-reverse;
}
</style>
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