From dc4db405d2991d3ec6a114f3b08d3fccd057d3ee Mon Sep 17 00:00:00 2001
From: Wolfgang Müller
Date: Thu, 13 Feb 2025 17:52:16 +0100
Subject: frontend: Migrate to Svelte 5

---
 frontend/src/lib/reader/PageView.svelte            | 26 ++++----
 frontend/src/lib/reader/Reader.svelte              | 76 ++++++++++++++++++++--
 frontend/src/lib/reader/ReaderPage.svelte          | 14 ++--
 .../lib/reader/components/CloseReaderButton.svelte | 15 +++--
 .../src/lib/reader/components/PageIndicator.svelte |  4 +-
 .../lib/reader/components/ReaderMenuButton.svelte  | 11 ++--
 6 files changed, 111 insertions(+), 35 deletions(-)

(limited to 'frontend/src/lib/reader')

diff --git a/frontend/src/lib/reader/PageView.svelte b/frontend/src/lib/reader/PageView.svelte
index 08764b7..81fbb97 100644
--- a/frontend/src/lib/reader/PageView.svelte
+++ b/frontend/src/lib/reader/PageView.svelte
@@ -1,8 +1,8 @@
 <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 { getReaderContext, partition, type Chunk } from './Reader.svelte';
 	import ReaderPage from './ReaderPage.svelte';
 
 	const reader = getReaderContext();
@@ -19,14 +19,14 @@
 	function gotoChunk(to: number) {
 		if (to < 0 || to >= chunks.length) return;
 
-		$reader.page = chunks[to].index;
+		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];
+			const pages: PageFragment[] = [chunks[at].main];
 
 			if (chunks[at].secondary) {
 				pages.push(chunks[at].secondary);
@@ -38,8 +38,8 @@
 		return [...peek(lookup[around] + 1), ...peek(lookup[around] - 1)];
 	}
 
-	const next = () => gotoChunk(lookup[$reader.page] + 1);
-	const prev = () => gotoChunk(lookup[$reader.page] - 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());
@@ -56,8 +56,8 @@
 		}
 	}
 
-	$: [chunks, lookup] = partition($reader.pages, layout);
-	$: layout, ({ main, secondary } = chunks[lookup[$reader.page]]);
+	$: [chunks, lookup] = partition(reader.pages, layout);
+	$: layout, ({ main, secondary } = chunks[lookup[reader.page]]);
 </script>
 
 <svelte:document
@@ -76,16 +76,16 @@
 />
 
 {#if !secondary}
-	<ReaderPage page={main} on:click={clickMain} --justify="center" />
+	<ReaderPage page={main} onclick={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" />
+	<ReaderPage page={main} onclick={prev} --justify="flex-end" />
+	<ReaderPage page={secondary} onclick={next} --justify="flex-start" />
 {:else}
-	<ReaderPage page={secondary} on:click={next} --justify="flex-end" />
-	<ReaderPage page={main} on:click={prev} --justify="flex-start" />
+	<ReaderPage page={secondary} onclick={next} --justify="flex-end" />
+	<ReaderPage page={main} onclick={prev} --justify="flex-start" />
 {/if}
 <div class="invisible absolute">
-	{#each pagesAround($reader.page) as page}
+	{#each pagesAround(reader.page) as page}
 		<img src={src(page.image, 'full')} alt="" />
 	{/each}
 </div>
diff --git a/frontend/src/lib/reader/Reader.svelte b/frontend/src/lib/reader/Reader.svelte
index 9bc7a82..b5cc725 100644
--- a/frontend/src/lib/reader/Reader.svelte
+++ b/frontend/src/lib/reader/Reader.svelte
@@ -1,32 +1,96 @@
+<script lang="ts" module>
+	import { Layout, type PageFragment } from '$gql/graphql';
+	import { getContext, setContext } from 'svelte';
+
+	export interface Chunk {
+		main: PageFragment;
+		secondary?: PageFragment;
+		index: number;
+	}
+
+	class ReaderContext {
+		visible = $state(false);
+		sidebar = $state(false);
+		pages: PageFragment[] = $state([]);
+		page = $state(0);
+
+		open = (page: number) => {
+			this.page = page;
+			this.visible = true;
+		};
+	}
+
+	export function initReaderContext() {
+		return setContext<ReaderContext>('reader', new ReaderContext());
+	}
+
+	export function getReaderContext() {
+		return getContext<ReaderContext>('reader');
+	}
+
+	export function partition(pages: PageFragment[], layout: Layout): [Chunk[], number[]] {
+		const single = layout === Layout.Single;
+		const offset = layout === Layout.DoubleOffset;
+
+		const chunks: Chunk[] = [];
+		const lookup: number[] = Array<number>(pages.length);
+
+		for (let chunkIndex = 0, pageIndex = 0; pageIndex < pages.length; chunkIndex++) {
+			const wide = () => pages[pageIndex].image.aspectRatio > 1;
+
+			const nextPage = () => {
+				lookup[pageIndex] = chunkIndex;
+				return pages[pageIndex++];
+			};
+
+			const offsetFirst = pageIndex === 0 && offset;
+			const full = single || wide() || offsetFirst;
+
+			const chunk: Chunk = { index: pageIndex, main: nextPage() };
+
+			if (!full && pageIndex < pages.length) {
+				if (!wide()) {
+					chunk.secondary = nextPage();
+				}
+			}
+
+			chunks.push(chunk);
+		}
+		return [chunks, lookup];
+	}
+</script>
+
 <script lang="ts">
 	import { trapFocus } from '$lib/Actions';
-	import { getReaderContext } from '$lib/Reader';
 	import { fadeDefault, slideXDefault } from '$lib/Transitions';
+	import type { Snippet } from 'svelte';
 	import { fade, slide } from 'svelte/transition';
 	import CloseReaderButton from './components/CloseReaderButton.svelte';
 	import PageIndicator from './components/PageIndicator.svelte';
 	import ReaderMenuButton from './components/ReaderMenuButton.svelte';
 
+	let { sidebar, children }: { sidebar?: Snippet; children?: Snippet } = $props();
+
 	const reader = getReaderContext();
 </script>
 
-{#if $reader.visible}
+{#if reader.visible}
 	<div
 		role="dialog"
 		class="fixed bottom-0 left-0 right-0 top-0 z-10 flex h-full w-full bg-black"
 		transition:fade={fadeDefault}
 		use:trapFocus
 	>
-		{#if $$slots.sidebar && $reader.sidebar}
+		{#if sidebar && reader.sidebar}
 			<aside class="w-[36rem] shrink-0 bg-slate-800" transition:slide={slideXDefault}>
 				<div class="flex h-full min-w-[36rem] flex-col gap-4 overflow-auto p-4">
-					<slot name="sidebar" />
+					{@render sidebar?.()}
 				</div>
 			</aside>
 		{/if}
 		<main class="relative flex grow">
 			<div class="absolute flex w-full p-1 text-lg [&>*:last-child]:ml-auto">
-				{#if $$slots.sidebar}
+				{#if sidebar}
 					<ReaderMenuButton />
 				{/if}
 				<CloseReaderButton />
@@ -36,7 +100,7 @@
 			</div>
 
 			<div class="flex grow">
-				<slot />
+				{@render children?.()}
 			</div>
 		</main>
 	</div>
diff --git a/frontend/src/lib/reader/ReaderPage.svelte b/frontend/src/lib/reader/ReaderPage.svelte
index fb3e780..83b2d1b 100644
--- a/frontend/src/lib/reader/ReaderPage.svelte
+++ b/frontend/src/lib/reader/ReaderPage.svelte
@@ -1,13 +1,19 @@
 <script lang="ts">
 	import type { PageFragment } from '$gql/graphql';
 	import { src } from '$lib/Utils';
+	import type { MouseEventHandler } from 'svelte/elements';
 
-	export let page: PageFragment;
+	interface Props {
+		page: PageFragment;
+		onclick: MouseEventHandler<HTMLDivElement>;
+	}
+
+	let { page, onclick }: Props = $props();
 </script>
 
-<!-- svelte-ignore a11y-click-events-have-key-events -->
-<!-- svelte-ignore a11y-no-static-element-interactions -->
-<div class="flex grow" on:click>
+<!-- svelte-ignore a11y_click_events_have_key_events -->
+<!-- svelte-ignore a11y_no_static_element_interactions -->
+<div class="flex grow" {onclick}>
 	<img
 		class="h-auto w-auto object-contain"
 		width={page.image.width}
diff --git a/frontend/src/lib/reader/components/CloseReaderButton.svelte b/frontend/src/lib/reader/components/CloseReaderButton.svelte
index 0c88323..f3eb4ba 100644
--- a/frontend/src/lib/reader/components/CloseReaderButton.svelte
+++ b/frontend/src/lib/reader/components/CloseReaderButton.svelte
@@ -1,19 +1,22 @@
 <script lang="ts">
-	import { getReaderContext } from '$lib/Reader';
 	import { accelerator } from '$lib/Shortcuts';
+	import { getReaderContext } from '../Reader.svelte';
 
 	const reader = getReaderContext();
+
+	function onclick() {
+		reader.visible = false;
+		reader.sidebar = false;
+	}
 </script>
 
 <button
 	type="button"
 	class="btn floating"
 	title="Close reader"
-	on:click={() => {
-		$reader.visible = false;
-		$reader.sidebar = false;
-	}}
+	aria-label="Close reader"
+	{onclick}
 	use:accelerator={'Escape'}
 >
-	<span class="icon-lg icon-[material-symbols--close]" />
+	<span class="icon-lg icon-[material-symbols--close]"></span>
 </button>
diff --git a/frontend/src/lib/reader/components/PageIndicator.svelte b/frontend/src/lib/reader/components/PageIndicator.svelte
index f79fc00..35190b3 100644
--- a/frontend/src/lib/reader/components/PageIndicator.svelte
+++ b/frontend/src/lib/reader/components/PageIndicator.svelte
@@ -1,9 +1,9 @@
 <script lang="ts">
-	import { getReaderContext } from '$lib/Reader';
+	import { getReaderContext } from '../Reader.svelte';
 
 	const reader = getReaderContext();
 </script>
 
 <div class="floating !p-2">
-	{$reader.page + 1}/{$reader.pages.length}
+	{reader.page + 1}/{reader.pages.length}
 </div>
diff --git a/frontend/src/lib/reader/components/ReaderMenuButton.svelte b/frontend/src/lib/reader/components/ReaderMenuButton.svelte
index aa20206..58648e8 100644
--- a/frontend/src/lib/reader/components/ReaderMenuButton.svelte
+++ b/frontend/src/lib/reader/components/ReaderMenuButton.svelte
@@ -1,16 +1,19 @@
 <script lang="ts">
-	import { getReaderContext } from '$lib/Reader';
 	import { accelerator } from '$lib/Shortcuts';
+	import { getReaderContext } from '../Reader.svelte';
 
 	const reader = getReaderContext();
+
+	let title = $derived(`${reader.sidebar ? 'Hide' : 'Show'} menu`);
 </script>
 
 <button
 	type="button"
 	class="btn floating invisible xl:visible"
-	title={`${$reader.sidebar ? 'Hide' : 'Show'} menu`}
-	on:click={() => ($reader.sidebar = !$reader.sidebar)}
+	{title}
+	aria-label={title}
+	onclick={() => (reader.sidebar = !reader.sidebar)}
 	use:accelerator={'z'}
 >
-	<span class="icon-lg icon-[material-symbols--dock-to-right]" />
+	<span class="icon-lg icon-[material-symbols--dock-to-right]"></span>
 </button>
-- 
cgit v1.2.3-2-gb3c3