Steffen Becker
1122f6d0a6
The dot advance was probed once, on the first row, and reused for every level below it — so a level with a smaller style ran ~9% short, 11mm of bare gap before the page number. Probed per font now (a handful of measurements, not one per row). A fixture's contents: 122/84/72 dots per row, exactly what LibreOffice draws.
355 lines
14 KiB
TypeScript
355 lines
14 KiB
TypeScript
import { Node, mergeAttributes } from '@tiptap/core';
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import type { Editor } from '@tiptap/core';
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import type { Node as PMNode } from '@tiptap/pm/model';
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import { MAX_HEADING_LEVEL } from '../../export/odt';
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import { readVerticalMargins, pageOfElement, topInEditor, FORCE_PAGE_RECALC } from './pageBreaks';
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// A generated table of contents: a block atom listing every heading (levels 1–5) with its
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// live page number. The node view regenerates entries from the headings + pagination and
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// caches them in `entries` (persisted like a Word/LO TOC field); round-trips to ODF/DOCX.
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export type TocEntry = { text: string; level: number; page: number };
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// The heading above the entries. An imported TOC keeps the one its file used
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// ("Inhalt", "Sommaire", …), or none at all where the file put its heading in a
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// separate paragraph (`''`); a freshly inserted one takes this.
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const TITLE = 'Table of Contents';
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// Enough leader dots to cross the widest gap a page can offer; fillLeaders cuts each
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// row's back to what its own gap holds, measuring one dot with this sample.
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const LEADER_DOTS = 200;
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const LEADER_PROBE = 10;
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declare module '@tiptap/core' {
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interface Commands<ReturnType> {
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tableOfContents: {
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setTableOfContents: () => ReturnType;
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};
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}
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}
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export const TableOfContents = Node.create({
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name: 'tableOfContents',
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group: 'block',
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atom: true,
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selectable: true,
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draggable: false,
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addAttributes() {
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return {
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title: {
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default: null as string | null,
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parseHTML: el => (el as HTMLElement).getAttribute('data-toc-title'),
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renderHTML: attrs => (attrs.title != null ? { 'data-toc-title': String(attrs.title) } : {}),
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},
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// Deepest heading level the index lists (ODF text:outline-level, Word's TOC \o
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// range): listing more than the file asks for inflates the block by pages.
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maxLevel: {
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default: MAX_HEADING_LEVEL,
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parseHTML: el => Number((el as HTMLElement).getAttribute('data-toc-levels')) || MAX_HEADING_LEVEL,
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renderHTML: attrs => ({ 'data-toc-levels': String(attrs.maxLevel ?? MAX_HEADING_LEVEL) }),
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},
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// The character filling the gap to the page number; null = the file's index leaves
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// it empty. Round-trips to style:leader-char on the entry template.
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leader: {
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default: '.',
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parseHTML: el => (el as HTMLElement).getAttribute('data-toc-leader') || null,
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renderHTML: attrs => (attrs.leader ? { 'data-toc-leader': String(attrs.leader) } : {}),
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},
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// Where the page number ends, in cm from the text margin — the file's own stop.
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// null = the end of the column, which is where a fresh index puts it.
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tabPosCm: {
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default: null,
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parseHTML: el => Number((el as HTMLElement).getAttribute('data-toc-tab')) || null,
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renderHTML: attrs => (attrs.tabPosCm ? { 'data-toc-tab': String(attrs.tabPosCm) } : {}),
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},
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// The named paragraph style of each level's entries (ODF's per-level entry
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// template). The rows carry it as data-style, so the document stylesheet gives
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// them the file's own indent, spacing and font.
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levelStyles: {
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default: null as (string | null)[] | null,
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parseHTML: el => {
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try { return JSON.parse((el as HTMLElement).getAttribute('data-toc-styles') ?? 'null'); }
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catch { return null; }
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},
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renderHTML: attrs => (attrs.levelStyles ? { 'data-toc-styles': JSON.stringify(attrs.levelStyles) } : {}),
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},
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entries: {
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default: [] as TocEntry[],
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parseHTML: el => {
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try { return JSON.parse((el as HTMLElement).getAttribute('data-entries') ?? '[]'); }
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catch { return []; }
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},
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renderHTML: attrs => ({ 'data-entries': JSON.stringify(attrs.entries ?? []) }),
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},
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};
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},
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parseHTML() {
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return [{ tag: 'div[data-toc]' }];
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},
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renderHTML({ HTMLAttributes, node }) {
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return ['div', mergeAttributes(HTMLAttributes, { 'data-toc': 'true' }), tocTitle(node.attrs.title)];
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},
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addCommands() {
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return {
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setTableOfContents:
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() =>
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({ commands }) =>
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commands.insertContent({ type: this.name }),
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};
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},
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addNodeView() {
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return ({ editor, getPos }) => new TocView(editor, getPos as () => number);
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},
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});
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// `''` is a title the file deliberately doesn't have, so only a missing one defaults.
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const tocTitle = (title: unknown): string => (typeof title === 'string' ? title : TITLE);
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type HeadingRef = { text: string; level: number; pos: number };
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// Node view: renders the title + one clickable row per heading. Recomputes on each
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// pagination settle (pm-pagecount, caught on the .paper ancestor) and on doc change,
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// writing entries back to the node attr — guarded by a serialized key against a loop.
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class TocView {
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dom: HTMLElement;
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private editor: Editor;
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private getPos: () => number;
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private scheduled = false;
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private lastKey = '';
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private wasPaginated = false;
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private paper: HTMLElement | null = null;
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private onPageCount = () => this.schedule();
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constructor(editor: Editor, getPos: () => number) {
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this.editor = editor;
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this.getPos = getPos;
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this.dom = document.createElement('div');
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this.dom.className = 'toc';
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this.dom.dataset.toc = 'true';
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this.dom.setAttribute('contenteditable', 'false');
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// Mount deferred so .paper exists and the first pagination pass has run.
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requestAnimationFrame(() => {
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this.paper = this.dom.closest('.paper') as HTMLElement | null;
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this.paper?.addEventListener('pm-pagecount', this.onPageCount);
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this.render();
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});
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}
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private schedule(): void {
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if (this.scheduled) return;
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this.scheduled = true;
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requestAnimationFrame(() => {
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this.scheduled = false;
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this.render();
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});
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}
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// Every heading with non-empty text down to the index's own level, in document order.
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private headings(): HeadingRef[] {
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const max = Math.min(MAX_HEADING_LEVEL, Number(this.node()?.attrs?.maxLevel) || MAX_HEADING_LEVEL);
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const out: HeadingRef[] = [];
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this.editor.state.doc.descendants((node, pos) => {
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if (node.type.name === 'heading') {
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// A hard break inside the heading is a line of the entry too — a book's
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// "Chapter 1" / title pair is two lines in LibreOffice's own index.
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let raw = '';
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node.forEach((child) => { raw += child.type.name === 'hardBreak' ? '\n' : child.textContent; });
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const text = raw.trim();
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const level = Math.min(MAX_HEADING_LEVEL, (node.attrs.level as number) ?? 1);
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if (text && level <= max) out.push({ text, level, pos });
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}
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});
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return out;
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}
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private cycle(): number {
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return readVerticalMargins(this.editor.view.dom as HTMLElement).cycle;
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}
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private pageOf(pos: number, cycle: number): number {
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const el = this.editor.view.nodeDOM(pos) as HTMLElement | null;
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if (!el || el.nodeType !== 1) return 1;
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return pageOfElement(this.editor.view, el, cycle);
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}
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private render(): void {
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if (this.editor.isDestroyed || !this.dom.isConnected) return;
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const heads = this.headings();
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const cycle = this.cycle();
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const entries: TocEntry[] = heads.map(h => ({ text: h.text, level: h.level, page: this.pageOf(h.pos, cycle) }));
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const key = JSON.stringify(entries);
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if (key !== this.lastKey) {
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this.lastKey = key;
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this.paint(entries, heads);
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this.syncAttr(entries);
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}
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this.paginate();
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}
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// The index is a block atom: it has no inner document positions for pagination to put
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// a spacer at, so one longer than a page breaks itself — the row that would cross the
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// boundary takes the gap to the next page's content top as its margin.
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private paginate(): void {
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const rows = Array.from(this.dom.querySelectorAll<HTMLElement>('.toc-entry'));
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if (!rows.length) return;
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const view = this.editor.view;
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const vm = readVerticalMargins(view.dom as HTMLElement);
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for (const row of rows) row.style.marginTop = '';
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// Read every natural top first: applying a gap moves each row below it, and one
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// reflow for the whole index beats one per row.
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const tops = rows.map(row => topInEditor(view, row));
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let shift = 0;
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let moved = false;
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rows.forEach((row, i) => {
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const top = tops[i] + shift;
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const page = Math.max(1, Math.floor(top / vm.cycle) + 1);
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if (top + row.offsetHeight <= (page - 1) * vm.cycle + vm.top + vm.contentHeight) return;
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const gap = page * vm.cycle + vm.top - top;
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if (gap <= 0) return;
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row.style.marginTop = `${gap}px`;
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shift += gap;
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moved = true;
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});
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// The index just changed height, and pagination measured the old one.
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if (moved !== this.wasPaginated) {
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this.wasPaginated = moved;
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view.dispatch(view.state.tr.setMeta('addToHistory', false).setMeta(FORCE_PAGE_RECALC, true));
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}
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}
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private paint(entries: TocEntry[], heads: HeadingRef[]): void {
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this.dom.textContent = '';
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const titleText = tocTitle(this.node()?.attrs?.title);
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if (titleText) {
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const title = document.createElement('div');
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title.className = 'toc-title';
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title.textContent = titleText;
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this.dom.appendChild(title);
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}
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if (entries.length === 0) {
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const empty = document.createElement('div');
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empty.className = 'toc-empty';
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empty.textContent = 'No headings yet — add an H1/H2/H3 to build the contents.';
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this.dom.appendChild(empty);
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return;
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}
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const fill = typeof this.node()?.attrs?.leader === 'string' ? String(this.node()!.attrs.leader) : '';
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const levelStyles = this.node()?.attrs?.levelStyles as (string | null)[] | null | undefined;
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entries.forEach((e, i) => {
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const row = document.createElement('div');
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row.className = `toc-entry toc-level-${e.level}`;
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const levelStyle = levelStyles?.[e.level - 1];
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if (levelStyle) row.dataset.style = levelStyle;
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const text = document.createElement('span');
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text.className = 'toc-text';
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e.text.split('\n').forEach((part, li) => {
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if (li) text.appendChild(document.createElement('br'));
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text.appendChild(document.createTextNode(part));
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});
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const leader = document.createElement('span');
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leader.className = 'toc-leader';
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// Real fill characters, as a word processor draws them: they scale with the font
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// and reach the PDF as text. The row clips whatever the gap has no room for.
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leader.textContent = fill.repeat(fill ? LEADER_DOTS : 0);
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const page = document.createElement('span');
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page.className = 'toc-page';
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page.textContent = String(e.page);
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row.append(text, leader, page);
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const pos = heads[i]?.pos;
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if (pos != null) {
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row.addEventListener('mousedown', ev => {
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ev.preventDefault();
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ev.stopPropagation();
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this.goTo(pos);
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});
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}
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this.dom.appendChild(row);
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});
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this.stopAtTab();
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this.fillLeaders();
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}
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// Pull the rows' right edge in to the index's own tab stop, so the page numbers end
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// where the file puts them rather than at the column's edge.
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private stopAtTab(): void {
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const cm = Number(this.node()?.attrs?.tabPosCm);
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this.dom.style.paddingRight = '';
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if (!(cm > 0)) return;
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const inset = this.dom.clientWidth - (cm * 96) / 2.54;
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if (inset > 1) this.dom.style.paddingRight = `${Math.round(inset)}px`;
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}
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// As many leader dots as the gap holds. The row clips the rest on screen, but nothing
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// else does: 200 of them reach the PDF, the clipboard and every measurement as text.
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private fillLeaders(): void {
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const range = document.createRange();
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// One dot's advance, probed once per font: the levels have styles of their own, and
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// measuring level 1's dot for a smaller level 3 leaves its row short of the number.
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const advances = new Map<string, number>();
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for (const el of this.dom.querySelectorAll<HTMLElement>('.toc-leader')) {
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const fill = el.textContent?.[0];
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if (!fill) continue;
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const cs = getComputedStyle(el);
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const key = `${fill}|${cs.fontSize}|${cs.fontFamily}|${cs.fontWeight}|${cs.fontStyle}`;
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let one = advances.get(key);
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if (one == null) {
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el.textContent = fill.repeat(LEADER_PROBE);
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range.selectNodeContents(el);
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one = range.getBoundingClientRect().width / LEADER_PROBE;
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advances.set(key, one);
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}
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el.textContent = one > 0 ? fill.repeat(Math.max(0, Math.floor(el.getBoundingClientRect().width / one))) : '';
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}
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}
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// Scroll the heading into view and drop the cursor into it.
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private goTo(pos: number): void {
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const dom = this.editor.view.nodeDOM(pos) as HTMLElement | null;
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dom?.scrollIntoView({ behavior: 'smooth', block: 'start' });
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this.editor.chain().focus().setTextSelection(pos + 1).run();
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}
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private node(): PMNode | null {
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const pos = this.getPos();
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return typeof pos === 'number' ? this.editor.state.doc.nodeAt(pos) : null;
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}
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private syncAttr(entries: TocEntry[]): void {
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const pos = this.getPos();
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if (typeof pos !== 'number') return;
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const node = this.editor.state.doc.nodeAt(pos);
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if (!node || node.type.name !== 'tableOfContents') return;
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if (JSON.stringify(node.attrs.entries ?? []) === JSON.stringify(entries)) return;
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const tr = this.editor.state.tr.setNodeAttribute(pos, 'entries', entries).setMeta('addToHistory', false);
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this.editor.view.dispatch(tr);
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}
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update(node: PMNode): boolean {
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if (node.type.name !== 'tableOfContents') return false;
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this.schedule();
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return true;
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}
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// Own the mouse on entry rows (navigation) but let clicks on the TOC background reach
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// ProseMirror so the block can be selected + deleted.
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stopEvent(event: Event): boolean {
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return event.type.startsWith('mouse') && !!(event.target as HTMLElement)?.closest?.('.toc-entry');
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}
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ignoreMutation(): boolean {
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return true;
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}
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destroy(): void {
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this.paper?.removeEventListener('pm-pagecount', this.onPageCount);
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}
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}
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