Storyline: unfoldable section list per chapter in the sidebar
Each chapter in the right-hand menu gets a caret that unfolds its numbered sections (e.g. the prologue's 28 scenes); clicking one jumps straight to it. The chapter you're reading starts unfolded, other chapters' sections link across (/storyline/overview#section-…), and the section at the top of the pane is highlighted as you scroll. - ChapterOutline service parses each rendered chapter for its <h2 class="storyline-section"> headings, adds anchor ids and returns the outline; the controller renders all chapters once to feed the sidebar. - storyline-toc Stimulus controller: fold/unfold, in-pane jump, scroll-spy (works in the split view and in the small-screen window-scroll fallback). - Tests for the outline parser. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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Frank
@@ -0,0 +1,72 @@
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import { Controller } from '@hotwired/stimulus';
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/*
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* Sidebar table of contents on a storyline chapter page.
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*
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* - the caret unfolds/folds a chapter's section list
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* - links for the chapter being read (target "link", href="#section-…")
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* jump inside the split view's scrolling pane
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* - the section currently at the top of the pane is highlighted
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*/
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export default class extends Controller {
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static targets = ['link'];
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connect() {
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this.pane = this.element.closest('.storyline-split-main');
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this.onScroll = () => {
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if (this.frame) return;
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this.frame = requestAnimationFrame(() => {
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this.frame = null;
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this.highlight();
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});
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};
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(this.pane || window).addEventListener('scroll', this.onScroll, { passive: true });
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window.addEventListener('scroll', this.onScroll, { passive: true });
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this.highlight();
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}
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disconnect() {
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(this.pane || window).removeEventListener('scroll', this.onScroll);
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window.removeEventListener('scroll', this.onScroll);
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}
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fold(event) {
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const item = event.currentTarget.closest('.storyline-toc-item');
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const open = item.classList.toggle('is-open');
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event.currentTarget.setAttribute('aria-expanded', open ? 'true' : 'false');
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}
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jump(event) {
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const id = event.currentTarget.getAttribute('href').slice(1);
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const el = document.getElementById(id);
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if (!el) return;
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event.preventDefault();
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el.scrollIntoView({ block: 'start' });
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history.replaceState(null, '', `#${id}`);
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}
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linkTargetConnected(link) {
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link.addEventListener('click', (e) => this.jump({ currentTarget: link, preventDefault: () => e.preventDefault() }));
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}
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highlight() {
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if (!this.hasLinkTarget) return;
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// In the split view the pane scrolls; on small screens the window does.
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const paneScrolls = this.pane && getComputedStyle(this.pane).overflowY !== 'visible';
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const top = paneScrolls ? this.pane.getBoundingClientRect().top : 0;
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let current = null;
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for (const link of this.linkTargets) {
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const el = document.getElementById(link.getAttribute('href').slice(1));
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if (el && el.getBoundingClientRect().top - top <= 90) current = link;
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}
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this.linkTargets.forEach((l) => l.classList.toggle('is-current', l === current));
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if (current && this.pane) {
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const list = current.closest('.storyline-toc-sections');
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if (list && list.scrollHeight > list.clientHeight) {
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const c = current.getBoundingClientRect();
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const l = list.getBoundingClientRect();
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if (c.top < l.top || c.bottom > l.bottom) current.scrollIntoView({ block: 'nearest' });
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}
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}
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}
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}
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@@ -260,6 +260,49 @@ table.dataTable {
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color: var(--bs-secondary-color);
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}
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/* Unfoldable per-chapter section lists */
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.storyline-toc-row { display: flex; align-items: flex-start; gap: 0.15rem; }
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.storyline-toc-row .storyline-toc-link { flex: 1 1 auto; min-width: 0; }
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.storyline-toc-fold {
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flex: 0 0 1.4rem;
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height: 1.9rem;
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padding: 0;
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border: 0;
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background: none;
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color: var(--bs-secondary-color);
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cursor: pointer;
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transition: transform 0.15s ease;
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}
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button.storyline-toc-fold:hover { color: var(--bs-body-color); }
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.storyline-toc-item.is-open > .storyline-toc-row > button.storyline-toc-fold { transform: rotate(90deg); }
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.storyline-toc-sections {
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display: none;
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margin: 0.1rem 0 0.4rem 1.4rem;
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padding: 0;
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max-height: 45vh;
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overflow-y: auto;
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scrollbar-width: none;
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font-size: 0.875rem;
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}
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.storyline-toc-sections::-webkit-scrollbar { display: none; }
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.storyline-toc-item.is-open > .storyline-toc-sections { display: block; }
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.storyline-toc-sub {
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display: flex;
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gap: 0.5rem;
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padding: 0.2rem 0.5rem;
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border-left: 2px solid var(--bs-border-color);
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text-decoration: none;
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color: var(--bs-secondary-color);
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}
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.storyline-toc-sub:hover { color: var(--bs-body-color); background: var(--bs-tertiary-bg); }
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.storyline-toc-sub.is-current {
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color: var(--bs-body-color);
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border-left-color: var(--bs-primary);
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font-weight: 600;
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}
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.storyline-toc-sub .storyline-toc-num { flex: 0 0 1.4rem; }
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.storyline-section { scroll-margin-top: 0.75rem; }
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/* --- Storyline: the document itself --------------------------------- */
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.storyline-doc {
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max-width: 46rem;
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@@ -4,6 +4,7 @@ namespace App\Controller;
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use App\Form\ChapterNoteType;
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use App\Repository\ChapterNoteRepository;
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use App\Storyline\ChapterOutline;
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use Doctrine\ORM\EntityManagerInterface;
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use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
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use Symfony\Component\HttpFoundation\Request;
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@@ -51,7 +52,7 @@ class StorylineController extends AbstractController
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}
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#[Route('/storyline/{slug}', name: 'app_storyline_chapter', requirements: ['slug' => '[a-z0-9-]+'], methods: ['GET', 'POST'])]
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public function chapter(string $slug, Request $request, ChapterNoteRepository $notes, EntityManagerInterface $em): Response
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public function chapter(string $slug, Request $request, ChapterNoteRepository $notes, EntityManagerInterface $em, ChapterOutline $outline): Response
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{
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if (!isset(self::CHAPTERS[$slug])) {
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throw $this->createNotFoundException('No such storyline chapter.');
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@@ -71,6 +72,18 @@ class StorylineController extends AbstractController
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return $this->redirectToRoute('app_storyline_chapter', ['slug' => $slug]);
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}
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// Render every chapter once: the current one is shown (with anchors),
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// the rest only feed the sidebar's per-section jump lists.
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$sections = [];
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$body = '';
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foreach (self::CHAPTERS as $s => $c) {
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$processed = $outline->process($this->renderView($c['template']));
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$sections[$s] = $processed['sections'];
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if ($s === $slug) {
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$body = $processed['html'];
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}
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}
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$slugs = array_keys(self::CHAPTERS);
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$pos = array_search($slug, $slugs, true);
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@@ -78,6 +91,8 @@ class StorylineController extends AbstractController
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'chapters' => self::CHAPTERS,
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'slug' => $slug,
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'chapter' => self::CHAPTERS[$slug],
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'body' => $body,
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'sections' => $sections,
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'note' => $note,
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'form' => $form,
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'prev' => $pos > 0 ? $slugs[$pos - 1] : null,
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@@ -0,0 +1,37 @@
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<?php
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namespace App\Storyline;
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use Symfony\Component\String\Slugger\AsciiSlugger;
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/**
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* Turns a rendered chapter into an outline: finds each numbered section
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* heading (<h2 class="storyline-section"><span>21</span> Title</h2>), gives it
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* an anchor id, and reports it so the sidebar can link straight to it.
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*/
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final class ChapterOutline
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{
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private const HEADING = '~<h2 class="storyline-section"([^>]*)>\s*<span>(.*?)</span>\s*(.*?)</h2>~s';
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/**
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* @return array{html: string, sections: list<array{id: string, num: string, title: string}>}
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*/
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public function process(string $html): array
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{
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$slugger = new AsciiSlugger();
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$sections = [];
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$n = 0;
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$html = preg_replace_callback(self::HEADING, function (array $m) use (&$sections, &$n, $slugger): string {
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++$n;
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$num = trim(html_entity_decode(strip_tags($m[2]), \ENT_QUOTES | \ENT_HTML5));
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$title = trim(html_entity_decode(strip_tags($m[3]), \ENT_QUOTES | \ENT_HTML5));
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$id = sprintf('section-%d-%s', $n, strtolower($slugger->slug($title)->toString()));
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$sections[] = ['id' => $id, 'num' => $num, 'title' => $title];
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return sprintf('<h2 class="storyline-section" id="%s"%s><span>%s</span> %s</h2>', $id, $m[1], $m[2], $m[3]);
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}, $html) ?? $html;
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return ['html' => $html, 'sections' => $sections];
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}
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}
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@@ -12,13 +12,33 @@
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<div class="storyline-toc">
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<a href="{{ path('app_storyline') }}" class="text-decoration-none small d-inline-block mb-2">← All chapters</a>
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<div class="text-uppercase small text-body-secondary fw-semibold mb-2" style="letter-spacing:.08em">Chapters</div>
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<ol class="list-unstyled mb-0">
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<ol class="list-unstyled mb-0" data-controller="storyline-toc">
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{% for s, c in chapters %}
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<li>
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{% set open = s == slug %}
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<li class="storyline-toc-item{{ open ? ' is-open' }}">
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<div class="storyline-toc-row">
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{% if sections[s] is not empty %}
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<button type="button" class="storyline-toc-fold" data-action="storyline-toc#fold"
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aria-expanded="{{ open ? 'true' : 'false' }}"
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aria-label="Show sections of {{ c.title }}">▸</button>
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{% else %}<span class="storyline-toc-fold"></span>{% endif %}
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<a href="{{ path('app_storyline_chapter', {slug: s}) }}"
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class="storyline-toc-link{{ s == slug ? ' is-active' }}">
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<span class="storyline-toc-num">{{ c.tag }}</span>{{ c.title }}
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</a>
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</div>
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{% if sections[s] is not empty %}
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<ol class="storyline-toc-sections list-unstyled">
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{% for sec in sections[s] %}
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<li>
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<a href="{{ s == slug ? '#' ~ sec.id : path('app_storyline_chapter', {slug: s}) ~ '#' ~ sec.id }}"
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class="storyline-toc-sub" {% if s == slug %}data-storyline-toc-target="link"{% endif %}>
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<span class="storyline-toc-num">{{ sec.num }}</span>{{ sec.title }}
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</a>
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</li>
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{% endfor %}
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</ol>
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{% endif %}
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</li>
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{% endfor %}
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</ol>
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@@ -33,7 +53,7 @@
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<p class="storyline-standfirst">{{ chapter.summary }}</p>
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</header>
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{{ include(chapter.template) }}
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{{ body|raw }}
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</article>
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<nav class="storyline-pager">
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@@ -0,0 +1,34 @@
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<?php
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namespace App\Tests\Storyline;
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use App\Storyline\ChapterOutline;
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use PHPUnit\Framework\TestCase;
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class ChapterOutlineTest extends TestCase
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{
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public function testFindsSectionsAndAddsAnchors(): void
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{
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$html = '<p>intro</p>'
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.'<h2 class="storyline-section"><span>21</span> Finding the Hearthburrow</h2><p>x</p>'
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.'<h2 class="storyline-section"><span>+</span> Appendix — Timing</h2>';
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$out = (new ChapterOutline())->process($html);
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self::assertSame('21', $out['sections'][0]['num']);
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self::assertSame('Finding the Hearthburrow', $out['sections'][0]['title']);
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self::assertSame('section-1-finding-the-hearthburrow', $out['sections'][0]['id']);
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self::assertSame('+', $out['sections'][1]['num']);
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self::assertSame('Appendix — Timing', $out['sections'][1]['title']);
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self::assertStringContainsString('<h2 class="storyline-section" id="section-1-finding-the-hearthburrow">', $out['html']);
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self::assertStringContainsString('<p>intro</p>', $out['html']);
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}
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public function testChapterWithoutSectionsIsUntouched(): void
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{
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$out = (new ChapterOutline())->process('<p>plain</p>');
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self::assertSame([], $out['sections']);
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self::assertSame('<p>plain</p>', $out['html']);
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}
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}
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