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<script lang="ts">
import { Direction, Layout, type PageFragment } from '$gql/graphql';
import { getReaderContext, partition, type Chunk } from '$lib/Reader';
import { binds } from '$lib/Shortcuts';
import { src } from '$lib/Utils';
import ReaderPage from './ReaderPage.svelte';
const reader = getReaderContext();
export let direction: Direction;
export let layout: Layout;
let chunks: Chunk[] = [];
let lookup: number[] = [];
let main: PageFragment;
let secondary: PageFragment | undefined;
function gotoChunk(to: number) {
if (to < 0 || to >= chunks.length) return;
$reader.page = chunks[to].index;
}
function pagesAround(around: number) {
const peek = (at: number) => {
if (at < 0 || at >= chunks.length) return [];
const pages = [chunks[at].main];
if (chunks[at].secondary) {
pages.push(chunks[at].secondary);
}
return pages;
};
return [...peek(lookup[around] + 1), ...peek(lookup[around] - 1)];
}
const next = () => gotoChunk(lookup[$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();
}
}
}
$: [chunks, lookup] = partition($reader.pages, layout);
$: layout, ({ main, secondary } = chunks[lookup[$reader.page]]);
</script>
<svelte:document
use:binds={[
['ArrowLeft', clickLeft],
['ArrowRight', clickRight],
['ArrowUp', prev],
['ArrowDown', next],
['PageUp', prev],
['PageDown', next],
[' ', next],
['Backspace', prev]
]}
/>
{#if !secondary}
<ReaderPage page={main} on:click={clickMain} --justify="center" />
{:else if direction === Direction.LeftToRight}
<ReaderPage page={main} on:click={prev} --justify="flex-end" />
<ReaderPage page={secondary} on:click={next} --justify="flex-start" />
{:else}
<ReaderPage page={secondary} on:click={next} --justify="flex-end" />
<ReaderPage page={main} on:click={prev} --justify="flex-start" />
{/if}
<div class="invisible absolute">
{#each pagesAround($reader.page) as page}
<img src={src(page.image, 'full')} alt="" />
{/each}
</div>
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