ackandClaude Fable 5.1
0d01e23d7c
From the development repository at 299f73d, 2026-10-11: hosting from the site documented; a page loaded from a notebook and left unchanged is not kept again; notebooks and pages are deleted from the chooser, to the system's Trash (--trash); the Notebooks button. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
1510 lines
58 KiB
JavaScript
1510 lines
58 KiB
JavaScript
// @ts-check
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/**
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* The Kokkoja client: the start screen, and the session screen that
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* connects the pen, the page and the other participants.
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*/
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import {
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deriveSession, formatInvitation, formatInvitationLink, loadIdentity, newIdentity, newSecret,
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parseInvitation, saveIdentity,
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} from './crypto.js';
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import {
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NotebookWriter, discardNotebook, discardPage, keepCurrentPage, keepIdentity, listKeptPages, listNotebooks, notebooksInBrowser,
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readCurrentPage, readIdentity, readPage, rememberToken, useBrowserStorage,
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} from './notebook.js';
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import { download, pickImageFile } from './browser_files.js';
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import { DEFAULT_NOTEBOOK, NotebookPicker } from './notebook_picker.js';
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import { pageFromSvg, pageToSvg } from './page_file.js';
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import { hashOf } from './crypto.js';
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import { imageResolution } from './image_info.js';
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import {
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LEAST_TEXT_POINTS, MAX_IMAGE_BYTES, MOST_TEXT_POINTS, TEXT_FONTS, TEXT_SIZE,
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UNITS_PER_POINT, strokesTouched, textAt, textsTouched,
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} from './page_model.js';
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import { attachPenInput } from './pen_input.js';
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import { Renderer } from './renderer.js';
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import { LEAST_IMAGE_SIDE, textBounds, rectAt } from './page_model.js';
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import { LINE_HEIGHT, TOP_GAP, layoutText } from './text_layout.js';
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import { log, logText, trace, watchLog } from './log.js';
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import { Session } from './session.js';
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import { NotebookChooser } from './chooser.js';
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import { FileChooser } from './file_chooser.js';
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import { writePicture } from './files.js';
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import { pageToPng } from './page_picture.js';
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import { TextEditor } from './text_editor.js';
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import { enableTooltips } from './tooltip.js';
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import { guardSelection, inField } from './selection_guard.js';
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import { QUIET_ZONE, qrModules, qrPath } from './qr_code.js';
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/**
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* The colours in the toolbar: black, red, green, blue, white (Andy's
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* teacher, 2026-10-08), with the palette's own values so that the palette
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* can leave them out.
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*/
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const COLORS = ['#000000', '#e53935', '#43a047', '#1e88e5', '#ffffff'];
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/** Everyone begins in black (Andy, 2026-10-03; the host began in red before). */
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const DEFAULT_COLOR = COLORS[0];
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/** Nominal line widths in page units (0.1 mm); the last is twice the one before (2026-10-08). */
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const WIDTHS = [4, 7, 12, 24];
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/** Whether the page grows when one's writing reaches an edge: 'no' if not. */
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const EXTEND_KEY = 'kokkoja_extend';
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/** Radius of the eraser on the screen, in CSS pixels. */
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const ERASER_RADIUS = 10;
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/** With the text tool or the eraser, a press that moves less than this (3 mm) is a tap. */
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const TAP_DISTANCE = 30;
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/**
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* Two taps of the eraser within this, both finding nothing to erase, undo
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* the latest gesture (Andy, 2026-10-11). A tap that erases something is
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* never half of a double tap, so the eraser's own taps are unaffected.
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*/
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const DOUBLE_TAP_MS = 400;
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/**
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* An image file is shared as it is if it is no larger than this, in bytes
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* and in pixels along its longer side. Otherwise it is made smaller and
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* stored as JPEG, so that it travels quickly and the page file stays small.
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*/
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const IMAGE_AS_IS_BYTES = 1500000;
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const IMAGE_LONGEST_SIDE = 2400;
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const NAME_KEY = 'kokkoja_name';
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/** Colours the user added from the palette, remembered in this browser. */
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const COLORS_KEY = 'kokkoja_colors';
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/**
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* The palette behind "+": eight hues in three shades, and greys. Our own,
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* not the browser's colour dialog, which crashes Firefox on Linux.
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*/
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const PALETTE = [
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'#e53935', '#fb8c00', '#fdd835', '#43a047', '#00acc1', '#1e88e5', '#8e24aa', '#d81b60',
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'#b71c1c', '#e65100', '#f9a825', '#1b5e20', '#006064', '#0d47a1', '#4a148c', '#880e4f',
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'#ffcdd2', '#ffe0b2', '#fff9c4', '#c8e6c9', '#b2ebf2', '#bbdefb', '#e1bee7', '#f8bbd0',
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'#ffffff', '#bdbdbd', '#757575', '#424242', '#8d6e63', '#5d4037', '#3e2723', '#000000',
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];
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const NOTEBOOK_KEY = 'kokkoja_notebook';
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/**
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* Where the installed Kokkoja program serves the client, for a guest who
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* opened an invitation link on a web site but has the program too.
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*/
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const INSTALLED_ADDRESS = 'http://localhost:8760/';
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/**
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* How this client was served (`config.json`): by the local program, which
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* keeps the notebooks as files ("files"), or by a web site, where the
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* notebooks are kept in the browser ("browser"). The relay is the one for
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* sessions started here; the site, if any, is a Kokkoja web site that an
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* invitation can be a link to.
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* @typedef {object} Config
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* @property {string} relay
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* @property {'files' | 'browser'} storage
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* @property {string} site
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*/
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/** @type {Config} */
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let config = { relay: '', storage: 'files', site: '' };
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/**
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* @param {string} id
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* @returns {HTMLElement}
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*/
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function element(id) {
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return /** @type {HTMLElement} */ (document.getElementById(id));
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}
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/**
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* @param {string} id
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* @returns {HTMLInputElement}
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*/
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function input(id) {
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return /** @type {HTMLInputElement} */ (document.getElementById(id));
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}
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/**
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* @param {string} id
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* @returns {HTMLSelectElement}
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*/
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function select(id) {
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return /** @type {HTMLSelectElement} */ (document.getElementById(id));
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}
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/** The start screen's notebook picker. */
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const startPicker = new NotebookPicker(
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select('notebook'), input('notebook_name'),
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(message) => { element('start_message').textContent = message; },
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() => {});
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/**
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* Our identity: the signing keys that make us the same participant in
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* every session. The local program keeps them, so that they survive the
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* browser and are the same from any browser on this computer; the first
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* time, they are made here and given to it.
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* @returns {Promise<import('./crypto.js').Identity>}
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*/
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async function ownIdentity() {
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const kept = await readIdentity();
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if (kept !== null) return loadIdentity(kept);
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const identity = await newIdentity();
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if (await keepIdentity(await saveIdentity(identity))) return identity;
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// Another tab got there first: use what it kept.
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const other = await readIdentity();
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return other !== null ? loadIdentity(other) : identity;
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}
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// Start screen.
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/** @param {string} [message] */
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function showStart(message = '') {
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element('session').hidden = true;
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element('start').hidden = false;
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element('start_message').textContent = message;
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input('name').value = localStorage.getItem(NAME_KEY) ?? '';
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const remembered = localStorage.getItem(NOTEBOOK_KEY) ?? DEFAULT_NOTEBOOK;
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startPicker.fill([], remembered);
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startPicker.current = remembered;
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const pending = invitationInAddress();
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if (pending) input('invitation_entry').value = pending;
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// An invitation is a request to join one session: arriving with one,
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// the screen offers joining alone (Andy, 2026-10-06, after starting a
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// session of his own by mistake on a guest's machine).
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element('start_choice').hidden = Boolean(pending);
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// From a web site, a guest who has the Kokkoja program installed may
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// prefer it, for a notebook of real files.
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const installed = /** @type {HTMLAnchorElement} */ (element('open_installed'));
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installed.hidden = !(pending && notebooksInBrowser());
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installed.href = `${INSTALLED_ADDRESS}#join=${encodeURIComponent(pending)}`;
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showNotebooks(startPicker).catch((error) => {
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element('notebook_note').textContent = String(error.message ?? error);
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element('notebook_note').classList.add('problem');
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});
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}
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/**
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* Offer the existing notebooks in a picker and say where notebooks are kept.
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* The picker's present choice stays chosen: the listing arrives later
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* than the screen, and a notebook made meanwhile must not be lost.
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* @param {NotebookPicker} picker
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*/
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async function showNotebooks(picker) {
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const { directory, notebooks } = await listNotebooks();
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const current = picker.value;
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picker.fill(notebooks, current);
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picker.current = current;
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for (const note of document.querySelectorAll('.notebook_directory')) {
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note.textContent = directory ? `Notebooks are kept in ${directory}`
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: 'Notebooks are kept in this browser, on this computer. “Keep page” also downloads the page.';
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note.classList.remove('problem');
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}
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}
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/**
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* The part of the page address after '#', as named values. The local
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* program puts the token there; a join link puts the invitation there.
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* Browsers do not send this part of an address to any server.
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*/
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function addressValues() {
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return new URLSearchParams(location.hash.slice(1));
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}
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/** How long a confirmation stays on the notice line, and a passing problem. */
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const NOTICE_MS = 6000;
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const PROBLEM_NOTICE_MS = 12000;
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/** A reconnection shorter than this is not announced. */
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const CONNECTION_GRACE_MS = 1500;
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/**
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* The notice line between the toolbar and the page. It says nothing
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* while all is well. A STANDING notice, kept by its source until that
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* source clears it, is a state: not connected, the page not being
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* saved, no page from the host yet. A PASSING notice is a report of
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* one event, kept for a few seconds: a page kept or exported, a file
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* that was not an image. Standing notices come before a passing one.
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*/
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/** @type {Map<string, {text: string, problem: boolean}>} */
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const standing = new Map();
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let passing = { text: '', problem: false };
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/** @type {ReturnType<typeof setTimeout> | undefined} */
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let passingTimer;
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function showNotice() {
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const line = element('notice');
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const states = [...standing.values()];
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const shown = states.length ? states : [passing];
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line.textContent = shown.map((notice) => notice.text).join(' ');
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line.hidden = line.textContent === '';
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line.classList.toggle('problem', shown.some((notice) => notice.problem));
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}
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/**
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* @param {string} source
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* @param {string} text '' clears the source's notice.
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* @param {boolean} [problem]
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*/
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function standingNotice(source, text, problem = true) {
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if (text) standing.set(source, { text, problem });
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else standing.delete(source);
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showNotice();
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}
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/**
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* @param {string} text
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* @param {boolean} [problem]
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*/
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function passingNotice(text, problem = false) {
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passing = { text, problem };
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clearTimeout(passingTimer);
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passingTimer = setTimeout(() => {
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passing = { text: '', problem: false };
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showNotice();
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}, problem ? PROBLEM_NOTICE_MS : NOTICE_MS);
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showNotice();
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}
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/**
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* The last word on saving, in the Session window.
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* @param {string} text
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* @param {boolean} problem
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*/
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function showSaveState(text, problem) {
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element('save_status').textContent = text;
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element('save_status').classList.toggle('problem', problem);
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}
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/**
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* The invitation link as a QR code in the Session window, for the camera
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* of a phone or a tablet (Andy, 2026-10-10: there is no good way to send
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* a link from a Linux computer to an iPad). None for a bare invitation,
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* which a camera could only show as text.
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* @param {string} link
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*/
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function showInvitationCode(link) {
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const holder = element('invitation_code');
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holder.replaceChildren();
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holder.hidden = link === '';
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if (link === '') return;
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const modules = qrModules(link);
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const span = modules.length + 2 * QUIET_ZONE;
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const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
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svg.setAttribute('viewBox', `${-QUIET_ZONE} ${-QUIET_ZONE} ${span} ${span}`);
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svg.setAttribute('shape-rendering', 'crispEdges');
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svg.setAttribute('role', 'img');
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svg.setAttribute('aria-label', 'The invitation as a QR code');
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const path = document.createElementNS('http://www.w3.org/2000/svg', 'path');
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path.setAttribute('d', qrPath(modules));
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path.setAttribute('fill', '#000');
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svg.append(path);
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holder.append(svg);
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}
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/** @returns {string} The invitation in the page address, or ''. */
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function invitationInAddress() {
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return addressValues().get('join') ?? '';
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}
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/**
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* Set the page address for a session, or for none.
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* @param {string} [invitation]
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*/
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function setAddress(invitation) {
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history.replaceState(null, '', invitation
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? `#join=${encodeURIComponent(invitation)}` : location.pathname);
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}
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/** @returns {string | null} The name entered, or null after complaining. */
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function enteredName() {
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const name = input('name').value.trim();
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if (!name) {
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element('start_message').textContent = 'Please enter your name.';
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input('name').focus();
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return null;
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}
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localStorage.setItem(NAME_KEY, name);
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return name;
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}
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/** @returns {string} The notebook chosen. */
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function enteredNotebook() {
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const notebook = startPicker.value || DEFAULT_NOTEBOOK;
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localStorage.setItem(NOTEBOOK_KEY, notebook);
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return notebook;
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}
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async function startSession() {
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const name = enteredName();
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if (!name) return;
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const identity = await ownIdentity();
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const secret = newSecret();
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const invitation = formatInvitation({ relay: config.relay, secret, hostId: identity.id });
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await enterSession(invitation, name, enteredNotebook());
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}
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async function joinSession() {
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const name = enteredName();
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if (!name) return;
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const invitation = input('invitation_entry').value.trim();
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if (!parseInvitation(invitation)) {
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element('start_message').textContent = 'That is not a Kokkoja invitation.';
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return;
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}
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await enterSession(invitation, name, enteredNotebook());
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}
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// Session screen.
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/**
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* Prepare an image file to be put on the page. The image's natural size
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* comes from the resolution the file records, if any, and otherwise from
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* taking a pixel as 0.1 mm (Andy's decision, 2026-10-03); where it goes on
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* the page is decided when it is added. An image of more pixels or bytes
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* than is useful is made smaller here, which does not change its natural
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* size.
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* @param {Blob} file
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* @returns {Promise<Parameters<Session['addImage']>[0]>}
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*/
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async function prepareImage(file) {
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const original = new Uint8Array(await file.arrayBuffer());
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const bitmap = await createImageBitmap(file);
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const dpi = imageResolution(original);
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const unitsPerPixel = dpi === null ? 1 : 254 / dpi;
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let blob = file;
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const longest = Math.max(bitmap.width, bitmap.height);
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const asIs = (file.type === 'image/png' || file.type === 'image/jpeg') &&
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file.size <= IMAGE_AS_IS_BYTES && longest <= IMAGE_LONGEST_SIDE;
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if (!asIs) {
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const scale = Math.min(1, IMAGE_LONGEST_SIDE / longest);
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const canvas = document.createElement('canvas');
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canvas.width = Math.round(bitmap.width * scale);
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canvas.height = Math.round(bitmap.height * scale);
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const context = /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
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context.fillStyle = '#ffffff';
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context.fillRect(0, 0, canvas.width, canvas.height);
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context.drawImage(bitmap, 0, 0, canvas.width, canvas.height);
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for (const quality of [0.9, 0.75, 0.5]) {
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blob = await new Promise((resolve, reject) => canvas.toBlob(
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(result) => (result ? resolve(result) : reject(new Error('The image could not be prepared.'))),
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'image/jpeg', quality));
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if (blob.size <= MAX_IMAGE_BYTES) break;
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}
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}
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if (blob.size > MAX_IMAGE_BYTES) throw new Error('The image is too large.');
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const data = blob === file ? original : new Uint8Array(await blob.arrayBuffer());
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const type = blob.type === 'image/png' ? 'image/png' : 'image/jpeg';
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return {
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type, data, hash: await hashOf(data),
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naturalWidth: bitmap.width * unitsPerPixel, naturalHeight: bitmap.height * unitsPerPixel,
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};
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}
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/**
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* The page to begin a session with, from the notebook's current page file.
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* If that file holds a page of this very session (the browser page was
|
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* reloaded, or we left and came back), the session continues from it. If
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* it holds a page of another session, that page is kept first, because the
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* file is about to be given over to this session.
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* @param {string} notebook
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* @param {string} roomId
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* @returns {Promise<import('./page_model.js').Page | undefined>}
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*/
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async function pageToContinue(notebook, roomId) {
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const text = await readCurrentPage(notebook);
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if (text === null) return undefined;
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const saved = pageFromSvg(text);
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if (saved && saved.session === roomId) return saved.page;
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await keepCurrentPage(notebook);
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return undefined;
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}
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/** True once this browser page has entered a session. */
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let entered = false;
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/**
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* Where a browser tab remembers the notebook it chose for a session.
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* @param {string} roomId
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*/
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function notebookKeyFor(roomId) {
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return `kokkoja_notebook_${roomId}`;
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}
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/**
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* @param {string} invitationText
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* @param {string} name
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* @param {string} notebook
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*/
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async function enterSession(invitationText, name, notebook) {
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const invitation = parseInvitation(invitationText);
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if (!invitation) {
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showStart('That is not a Kokkoja invitation.');
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return;
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}
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if (entered) return;
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entered = true;
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const { roomId, key } = await deriveSession(invitation.secret);
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const identity = await ownIdentity();
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// A browser tab stays with the notebook it chose for a session.
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const notebookKey = notebookKeyFor(roomId);
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notebook = sessionStorage.getItem(notebookKey) ?? notebook;
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sessionStorage.setItem(notebookKey, notebook);
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const savedPage = await pageToContinue(notebook, roomId);
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setAddress(invitationText);
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||
element('start').hidden = true;
|
||
element('session').hidden = false;
|
||
// The invitation is shown as a link to the web site when there is one,
|
||
// so that a guest can open it and be in the session with nothing
|
||
// installed. The link carries the invitation itself.
|
||
const plainInvitation = formatInvitation(invitation);
|
||
input('invitation').value = config.site ? formatInvitationLink(config.site, plainInvitation) : plainInvitation;
|
||
showInvitationCode(config.site ? input('invitation').value : '');
|
||
|
||
const isHost = identity.id === invitation.hostId;
|
||
let tool = /** @type {'pen' | 'eraser' | 'text' | 'hide'} */ ('pen');
|
||
let color = DEFAULT_COLOR;
|
||
let width = WIDTHS[1];
|
||
let textSize = TEXT_SIZE;
|
||
let textFont = /** @type {import('./page_model.js').TextFont} */ ('sans-serif');
|
||
|
||
/** @type {Renderer} */
|
||
let renderer;
|
||
let layerOrder = '';
|
||
|
||
function syncLayers() {
|
||
const order = session.layerOrder();
|
||
if (order.join(' ') === layerOrder) return;
|
||
layerOrder = order.join(' ');
|
||
renderer.setLayerOrder(order);
|
||
}
|
||
|
||
/**
|
||
* @param {import('./page_model.js').Page} page
|
||
* @returns {string} The page file.
|
||
*/
|
||
const fileOf = (page) => pageToSvg(page, { session: roomId, hostId: invitation.hostId });
|
||
|
||
function showPageNumber() {
|
||
const waiting = session.page.number === 0;
|
||
element('page_number').textContent = waiting ? 'No page yet' : `Page ${session.page.number}`;
|
||
standingNotice('page', waiting ? 'Waiting for the host’s page' : '', false);
|
||
}
|
||
/** @type {ReturnType<typeof setTimeout> | undefined} */
|
||
let connectionNoticeTimer;
|
||
|
||
const session = new Session(
|
||
{
|
||
relay: invitation.relay, roomId, key, identity, hostId: invitation.hostId, name,
|
||
page: savedPage,
|
||
},
|
||
{
|
||
onLayerReplaced: (layerId) => {
|
||
syncLayers();
|
||
renderer.redrawLayer(layerId);
|
||
writer.changed();
|
||
},
|
||
onStrokeProgress: (layerId, stroke) => {
|
||
syncLayers();
|
||
renderer.strokeProgress(layerId, stroke);
|
||
if (stroke.done) writer.changed();
|
||
},
|
||
onTextChanged: (layerId) => {
|
||
syncLayers();
|
||
renderer.redrawLayer(layerId);
|
||
writer.changed();
|
||
},
|
||
onPageReplaced: (oldPage, newPage) => {
|
||
log(`Page ${newPage.number} (${newPage.images.length} images) replaces page ${oldPage.number}`);
|
||
// A block being typed stays on the page being left, where every
|
||
// keystroke already put it; finishing the edit now would move it
|
||
// to the new page (seen by Andy, 2026-10-06). An empty one is
|
||
// dropped from the old page before that page is kept.
|
||
const abandoned = textEditor?.discard() ?? null;
|
||
if (abandoned && abandoned.text.trim() === '') {
|
||
oldPage.layers.get(session.identity.id)?.texts.delete(abandoned.id);
|
||
}
|
||
// Nothing is lost: the page being left is kept in the notebook.
|
||
writer.pageReplaced(oldPage.number > 0 ? fileOf(oldPage) : null);
|
||
renderer.setPage(newPage);
|
||
layerOrder = '';
|
||
syncLayers();
|
||
showParticipants(session, renderer);
|
||
showPageNumber();
|
||
},
|
||
onImagesChanged: () => {
|
||
log(`Page ${session.page.number}: ${session.page.images.length} images, ${session.page.hides.length} hides`);
|
||
renderer.showImages();
|
||
renderer.drawHides();
|
||
writer.writeNow();
|
||
},
|
||
onPageResized: () => {
|
||
// The view keeps its scale; the page extends beyond the window.
|
||
renderer.resize();
|
||
textEditor?.layout();
|
||
writer.changed();
|
||
},
|
||
onViewCommand: (command) => {
|
||
log(`The host's view: ${command === 'fit' ? 'Fit' : 'A4'}`);
|
||
if (command === 'fit') renderer.fit();
|
||
else renderer.sheetScale();
|
||
},
|
||
onPermissionsChanged: () => {
|
||
log(`May start pages: ${session.mayMakePages() ? 'yes' : 'no'}` +
|
||
(session.isHost ? `; guests allowed: ${session.permitted.size}` : ''));
|
||
showHostTools();
|
||
showParticipants(session, renderer);
|
||
},
|
||
onParticipantsChanged: () => {
|
||
syncLayers();
|
||
showParticipants(session, renderer);
|
||
},
|
||
onUndoChanged: () => {
|
||
/** @type {HTMLButtonElement} */ (element('undo')).disabled = !session.canUndo();
|
||
},
|
||
onStatus: (status, detail) => {
|
||
const text = { connecting: 'Connecting…', connected: 'Connected', failed: detail ?? 'Disconnected' };
|
||
log(`Relay: ${text[status]}`);
|
||
element('status').textContent = text[status];
|
||
element('status').classList.toggle('problem', status !== 'connected');
|
||
// The notice line says nothing while connected, nothing during a
|
||
// short reconnection either, and stays up while a longer one lasts.
|
||
// Every attempt reports 'connecting' again, so the grace runs from
|
||
// the first of them.
|
||
if (status === 'connecting') {
|
||
if (connectionNoticeTimer === undefined && !standing.has('connection')) {
|
||
connectionNoticeTimer = setTimeout(() => {
|
||
connectionNoticeTimer = undefined;
|
||
standingNotice('connection', 'Not connected. Reconnecting…');
|
||
}, CONNECTION_GRACE_MS);
|
||
}
|
||
return;
|
||
}
|
||
clearTimeout(connectionNoticeTimer);
|
||
connectionNoticeTimer = undefined;
|
||
standingNotice('connection', status === 'connected' ? '' : text.failed);
|
||
},
|
||
});
|
||
|
||
const writer = new NotebookWriter(
|
||
notebook,
|
||
() => (session.page.number > 0 ? fileOf(session.page) : null),
|
||
{
|
||
onSaved: (time) => {
|
||
showSaveState(`Saved at ${time}`, false);
|
||
standingNotice('saving', '');
|
||
},
|
||
onProblem: (message) => {
|
||
showSaveState(message, true);
|
||
standingNotice('saving', message);
|
||
},
|
||
onKept: (message) => passingNotice(message),
|
||
});
|
||
showSaveState(savedPage ? 'Continued from the notebook' : '', false);
|
||
|
||
const pageElement = element('page');
|
||
renderer = new Renderer(pageElement, session.page);
|
||
/** @type {TextEditor | null} */
|
||
let textEditor = null;
|
||
syncLayers();
|
||
for (const layerId of session.page.layers.keys()) renderer.redrawLayer(layerId);
|
||
showParticipants(session, renderer);
|
||
showPageNumber();
|
||
new ResizeObserver(() => {
|
||
renderer.resize();
|
||
textEditor?.layout();
|
||
}).observe(/** @type {Element} */ (pageElement.parentElement));
|
||
|
||
// The toolbar, when the window is too narrow for one row, centres its
|
||
// rows rather than holding the two ends (Andy, 2026-10-09). Wrapping
|
||
// is told from the toolbar's height against one row's.
|
||
const toolbar = /** @type {HTMLElement} */ (document.querySelector('.toolbar'));
|
||
const watchToolbar = () => {
|
||
// One row is a control's height plus the toolbar's padding; two rows
|
||
// are nearly twice that.
|
||
const row = /** @type {HTMLElement} */ (toolbar.firstElementChild).offsetHeight;
|
||
toolbar.classList.toggle('wrapped', toolbar.clientHeight > row * 1.9);
|
||
};
|
||
new ResizeObserver(watchToolbar).observe(toolbar);
|
||
watchToolbar();
|
||
// The drawing group keeps the width of its widest state, the pen's
|
||
// colours and widths, so that the page-and-view group, centred between
|
||
// it and the session group, stays put when the tool changes (Andy,
|
||
// 2026-10-11). The floor rises if the group ever grows, as when a
|
||
// colour is added.
|
||
// The settings (colours, widths, font and size) keep their widest
|
||
// room likewise, so that Eraser, Hide and Undo, which stand after them
|
||
// since 2026-10-11, do not jump when a tool shows fewer settings.
|
||
for (const part of [element('drawing'), element('settings')]) {
|
||
let widest = 0;
|
||
new ResizeObserver(() => {
|
||
const width = part.getBoundingClientRect().width;
|
||
if (width > widest) {
|
||
widest = width;
|
||
part.style.minWidth = `${width}px`;
|
||
}
|
||
}).observe(part);
|
||
}
|
||
|
||
textEditor = new TextEditor(pageElement, renderer, {
|
||
setText: (block) => session.setText(block),
|
||
removeText: (id) => session.removeTexts([id]),
|
||
beginEdit: (id) => session.beginTextEdit(id, 'editor'),
|
||
endEdit: (id) => session.endTextEdit(id, 'editor'),
|
||
// A hold on the field being typed in moves its block, as on the page.
|
||
beginHold: (clientX, clientY) => penTarget.beginHold?.(clientX, clientY) ?? false,
|
||
holdMove: (clientX, clientY) => penTarget.holdMove?.(clientX, clientY),
|
||
holdEnd: () => penTarget.holdEnd?.(),
|
||
});
|
||
|
||
// Undo: one's own latest gesture, then the one before (Andy,
|
||
// 2026-10-11): the button, Ctrl+Z (Command+Z on a Mac) outside a field,
|
||
// and two quick taps of the eraser on empty paper (eraseEnded below).
|
||
// A block being typed is finished first, so that the undo is of it.
|
||
const undo = () => {
|
||
textEditor?.stop();
|
||
const what = session.undo();
|
||
if (what) log(`Undid ${what}`);
|
||
};
|
||
element('undo').addEventListener('click', undo);
|
||
document.addEventListener('keydown', (event) => {
|
||
if ((event.ctrlKey || event.metaKey) && !event.shiftKey && !event.altKey &&
|
||
event.key.toLowerCase() === 'z' && !inField()) {
|
||
event.preventDefault();
|
||
undo();
|
||
}
|
||
});
|
||
|
||
// Whether one's own writing may grow the page (the "Extend" box).
|
||
let extend = localStorage.getItem(EXTEND_KEY) !== 'no';
|
||
const extendBox = input('extend');
|
||
extendBox.checked = extend;
|
||
extendBox.addEventListener('change', () => {
|
||
extend = extendBox.checked;
|
||
localStorage.setItem(EXTEND_KEY, extend ? 'yes' : 'no');
|
||
});
|
||
/**
|
||
* With "Extend" off, points that would make the page grow are dropped:
|
||
* the stroke stops short of the edge and resumes when the pen is back
|
||
* inside. Nothing is stored beyond the page.
|
||
* @param {number[]} points
|
||
* @returns {number[]}
|
||
*/
|
||
const withinPage = (points) => {
|
||
if (extend) return points;
|
||
const page = session.page;
|
||
const kept = [];
|
||
for (let i = 0; i < points.length; i += 3) {
|
||
if (page.holdsWriting(points[i], points[i + 1], width)) kept.push(points[i], points[i + 1], points[i + 2]);
|
||
}
|
||
return kept;
|
||
};
|
||
|
||
let reportedDevice = '';
|
||
|
||
/**
|
||
* What a hold of the pen is handling: a Hide rectangle, a text block of
|
||
* ours, or an image; which; whether a corner is being dragged (and then
|
||
* which, with the opposite one fixed); and how the pen's position maps
|
||
* to the rectangle. Images keep their shape when scaled; the others
|
||
* resize freely (Andy, 2026-10-08).
|
||
* @typedef {object} Held
|
||
* @property {'hide' | 'text' | 'image'} kind
|
||
* @property {number} index Of the Hide rectangle or image.
|
||
* @property {string} id Of the text block.
|
||
* @property {[number, number] | null} corner
|
||
* @property {[number, number]} fixed
|
||
* @property {number} aspect
|
||
* @property {number} offsetX
|
||
* @property {number} offsetY
|
||
*/
|
||
/** @type {Held | null} */
|
||
let held = null;
|
||
/** When the eraser last tapped empty paper, by performance.now(); 0 if not lately. */
|
||
let lastEmptyTap = 0;
|
||
/** @type {import('./page_model.js').Stroke | null} The stroke a hold began as. */
|
||
let strokeInProgress = null;
|
||
|
||
/**
|
||
* The rectangle a hold has moved or resized to, from the pen's position.
|
||
* @param {Held} h
|
||
* @param {import('./page_model.js').Rectangle} now The rectangle as it is.
|
||
* @param {number} x
|
||
* @param {number} y
|
||
* @param {boolean} keepShape
|
||
* @returns {import('./page_model.js').Rectangle}
|
||
*/
|
||
function heldRect(h, now, x, y, keepShape) {
|
||
if (!h.corner) return { left: x - h.offsetX, top: y - h.offsetY, width: now.width, height: now.height };
|
||
const [fx, fy] = h.fixed;
|
||
const dirX = h.corner[0] ? 1 : -1;
|
||
const dirY = h.corner[1] ? 1 : -1;
|
||
let w = Math.max((x - fx) * dirX, LEAST_IMAGE_SIDE);
|
||
let hgt = Math.max((y - fy) * dirY, LEAST_IMAGE_SIDE);
|
||
if (keepShape) {
|
||
// Along the diagonal from the fixed corner, so the aspect ratio holds.
|
||
w = Math.max((x - fx) * dirX, (y - fy) * dirY * h.aspect, LEAST_IMAGE_SIDE, LEAST_IMAGE_SIDE * h.aspect);
|
||
hgt = w / h.aspect;
|
||
}
|
||
return { left: dirX > 0 ? fx : fx - w, top: dirY > 0 ? fy : fy - hgt, width: w, height: hgt };
|
||
}
|
||
|
||
/**
|
||
* @param {Held['kind']} kind
|
||
* @param {number} index
|
||
* @param {string} id
|
||
* @param {import('./page_model.js').Rectangle} r
|
||
* @param {[number, number] | null} corner
|
||
* @param {number} x
|
||
* @param {number} y
|
||
* @returns {Held}
|
||
*/
|
||
const hold = (kind, index, id, r, corner, x, y) => ({
|
||
kind, index, id, corner,
|
||
fixed: corner ? [r.left + (1 - corner[0]) * r.width, r.top + (1 - corner[1]) * r.height] : [0, 0],
|
||
aspect: r.width / r.height, offsetX: x - r.left, offsetY: y - r.top,
|
||
});
|
||
|
||
/**
|
||
* @param {Held} h
|
||
* @returns {import('./page_model.js').Rectangle | null}
|
||
*/
|
||
function currentHeldRect(h) {
|
||
const page = session.page;
|
||
if (h.kind === 'hide') {
|
||
const hide = page.hides[h.index];
|
||
return hide ? { left: hide.x, top: hide.y, width: hide.width, height: hide.height } : null;
|
||
}
|
||
if (h.kind === 'image') {
|
||
const image = page.images[h.index];
|
||
return image ? { left: image.x, top: image.y, width: image.width, height: image.height } : null;
|
||
}
|
||
const block = session.ownLayer.texts.get(h.id);
|
||
return block ? textBounds(block) : null;
|
||
}
|
||
|
||
/** @type {import('./pen_input.js').PenTarget} */
|
||
const penTarget = {
|
||
toPage: (clientX, clientY) => renderer.pageFromClient(clientX, clientY),
|
||
tool: () => tool,
|
||
canWrite: () => session.page.number > 0,
|
||
beginStroke: () => {
|
||
textEditor?.stop();
|
||
strokeInProgress = session.beginStroke(color, width);
|
||
},
|
||
addPoints: (points) => {
|
||
const inside = withinPage(points);
|
||
if (inside.length) session.addPoints(inside);
|
||
},
|
||
endStroke: () => {
|
||
strokeInProgress = null;
|
||
session.endStroke();
|
||
},
|
||
beginZoom: (clientX, clientY) => renderer.beginZoomDrag(clientX, clientY),
|
||
zoomTo: (pixelsUp) => renderer.zoomDragTo(pixelsUp),
|
||
endZoom: () => renderer.endZoomDrag(),
|
||
// A hold moves what is under the pen, or resizes it from a corner: a
|
||
// Hide rectangle or an image (for the host and co-hosts), or a
|
||
// text block of our own. The dot drawn meanwhile goes.
|
||
beginHold: (clientX, clientY) => {
|
||
const [x, y] = renderer.pageFromClient(clientX, clientY);
|
||
const reach = renderer.cornerReach();
|
||
const page = session.page;
|
||
/** @type {Held | null} */
|
||
let found = null;
|
||
const hide = session.mayMakePages() ? page.hideAt(x, y, reach) : null;
|
||
if (hide) {
|
||
const h = page.hides[hide.index];
|
||
found = hold('hide', hide.index, h.id, { left: h.x, top: h.y, width: h.width, height: h.height }, hide.corner, x, y);
|
||
session.beginHideEdit(h.id);
|
||
} else {
|
||
const blocks = [...session.ownLayer.texts.values()];
|
||
const at = rectAt(blocks.map(textBounds), x, y, reach);
|
||
if (at) {
|
||
const block = blocks[at.index];
|
||
// Free text has no corners to resize by.
|
||
const corner = block.height === null ? null : at.corner;
|
||
found = hold('text', at.index, block.id, textBounds(block), corner, x, y);
|
||
session.beginTextEdit(block.id, 'hold');
|
||
} else if (session.mayMakePages()) {
|
||
const image = page.imageAt(x, y, reach);
|
||
if (image) {
|
||
const index = session.raiseImage(image.index);
|
||
const im = page.images[index];
|
||
found = hold('image', index, '', { left: im.x, top: im.y, width: im.width, height: im.height }, image.corner, x, y);
|
||
}
|
||
}
|
||
}
|
||
if (!found) return false;
|
||
if (strokeInProgress) {
|
||
const begun = strokeInProgress;
|
||
strokeInProgress = null;
|
||
session.endStroke(false);
|
||
session.erase([begun.id]);
|
||
}
|
||
textEditor?.hidePreview();
|
||
held = found;
|
||
renderer.showGrip(currentHeldRect(found), found.corner);
|
||
log(`${found.kind} held${found.corner ? ' at a corner' : ''}`);
|
||
return true;
|
||
},
|
||
holdMove: (clientX, clientY) => {
|
||
if (!held) return;
|
||
const [x, y] = renderer.pageFromClient(clientX, clientY);
|
||
const now = currentHeldRect(held);
|
||
if (!now) return;
|
||
const rect = heldRect(held, now, x, y, held.kind === 'image');
|
||
if (held.kind === 'image') {
|
||
held.index = session.placeImageByHand(held.index, rect);
|
||
} else if (held.kind === 'hide') {
|
||
session.placeHideByHand(held.index, rect);
|
||
} else {
|
||
const block = session.ownLayer.texts.get(held.id);
|
||
if (!block) return;
|
||
block.x = Math.round(rect.left);
|
||
block.y = Math.round(rect.top);
|
||
if (block.height !== null) {
|
||
block.width = Math.round(rect.width);
|
||
Object.assign(block, layoutText(block.text, block.width, block.size, block.font));
|
||
block.height = Math.max(Math.round(rect.height), Math.ceil(block.boxHeight));
|
||
}
|
||
session.setText(block);
|
||
// The field being typed in follows its block.
|
||
if (textEditor?.block?.id === block.id) textEditor.layout();
|
||
}
|
||
renderer.showGrip(currentHeldRect(held), held.corner);
|
||
},
|
||
holdEnd: () => {
|
||
if (!held) return;
|
||
const r = currentHeldRect(held);
|
||
if (r) log(`${held.kind} placed at ${r.left / 100}, ${r.top / 100} cm, ${r.width / 100} by ${r.height / 100} cm`);
|
||
if (held.kind !== 'text') session.sendPageNow();
|
||
if (held.kind === 'text') session.endTextEdit(held.id, 'hold');
|
||
if (held.kind === 'hide') session.endHideEdit();
|
||
held = null;
|
||
renderer.showGrip(null);
|
||
},
|
||
eraseAlong: (x0, y0, x1, y1) => {
|
||
textEditor?.stop();
|
||
session.beginErasing();
|
||
const radius = renderer.pageLength(ERASER_RADIUS);
|
||
const strokes = strokesTouched(session.ownLayer, x0, y0, x1, y1, radius);
|
||
const texts = textsTouched(session.ownLayer, x0, y0, x1, y1, radius);
|
||
session.erase(strokes);
|
||
session.removeTexts(texts);
|
||
return { strokes: strokes.length, texts: texts.length };
|
||
},
|
||
eraseEnded: (x, y, reach) => {
|
||
// What the movement erased is one gesture to undo.
|
||
const erased = session.endErasing();
|
||
if (reach >= TAP_DISTANCE) {
|
||
lastEmptyTap = 0;
|
||
return;
|
||
}
|
||
// A tap of the eraser on a Hide rectangle or an image removes it
|
||
// (the right to make pages, or having added the image).
|
||
let took = erased.strokes + erased.texts > 0;
|
||
if (!took) {
|
||
const hide = session.page.hideAt(x, y, 0);
|
||
if (hide && session.removeHide(hide.index)) {
|
||
log(`Hide ${hide.index + 1} removed`);
|
||
took = true;
|
||
} else {
|
||
const found = session.page.imageAt(x, y, 0);
|
||
if (found && session.removeImage(found.index)) {
|
||
log(`Image ${found.index + 1} removed`);
|
||
took = true;
|
||
}
|
||
}
|
||
}
|
||
if (took) {
|
||
lastEmptyTap = 0;
|
||
return;
|
||
}
|
||
// A tap on empty paper: the second within DOUBLE_TAP_MS undoes.
|
||
const now = performance.now();
|
||
if (now - lastEmptyTap <= DOUBLE_TAP_MS) {
|
||
lastEmptyTap = 0;
|
||
undo();
|
||
} else {
|
||
lastEmptyTap = now;
|
||
}
|
||
},
|
||
previewRect: (x0, y0, x1, y1) => {
|
||
if (Math.abs(x1 - x0) >= TAP_DISTANCE || Math.abs(y1 - y0) >= TAP_DISTANCE) {
|
||
textEditor?.showPreview(x0, y0, x1, y1);
|
||
} else {
|
||
textEditor?.hidePreview();
|
||
}
|
||
},
|
||
placeRect: (x0, y0, x1, y1) => {
|
||
if (!textEditor) return;
|
||
textEditor.hidePreview();
|
||
const dragged = Math.hypot(x1 - x0, y1 - y0) >= TAP_DISTANCE;
|
||
const rect = {
|
||
left: Math.min(x0, x1), top: Math.min(y0, y1),
|
||
width: Math.max(100, Math.round(Math.abs(x1 - x0))), height: Math.max(100, Math.round(Math.abs(y1 - y0))),
|
||
};
|
||
if (tool === 'hide') {
|
||
if (dragged && session.addHide(rect)) log('Hide made');
|
||
return;
|
||
}
|
||
const editing = textEditor.block;
|
||
textEditor.stop();
|
||
const own = textAt(session.ownLayer, x0, y0);
|
||
if (!dragged) {
|
||
// A tap: into our own text to change it, or free text here. A
|
||
// tap elsewhere while typing only finishes the block (2026-10-09).
|
||
if (own && own !== editing) textEditor.edit(own);
|
||
else if (!own && !editing) textEditor.begin(x0, y0, null, null, { color, size: textSize, font: textFont });
|
||
} else {
|
||
// A rectangle dragged open: at least one line tall.
|
||
const line = Math.ceil(textSize * (TOP_GAP + LINE_HEIGHT));
|
||
textEditor.begin(rect.left, rect.top, rect.width, Math.max(rect.height, line),
|
||
{ color, size: textSize, font: textFont });
|
||
}
|
||
},
|
||
onReport: (report) => {
|
||
// To the console once, and again when the kind of device changes.
|
||
if (report.pointerType === reportedDevice || report.pointsPerSecond === 0) return;
|
||
reportedDevice = report.pointerType;
|
||
log(`Input: ${report.pointerType}, pressure ${report.pressure.toFixed(2)}, ` +
|
||
`${report.pointsPerSecond} points per second`);
|
||
},
|
||
};
|
||
attachPenInput(pageElement, penTarget);
|
||
|
||
buildToolbar({
|
||
color, width, textSize, textFont,
|
||
setTool: (value) => {
|
||
if (value !== 'text') textEditor?.stop();
|
||
if (value !== tool) trace(`Tool: ${value}`);
|
||
tool = value;
|
||
// Only the chosen tool's settings show: the pen's colours and line
|
||
// widths, the text's colours, size and font, nothing for the eraser.
|
||
element('colors').hidden = value === 'eraser' || value === 'hide';
|
||
element('widths').hidden = value !== 'pen';
|
||
element('text_style').hidden = value !== 'text';
|
||
},
|
||
setColor: (value) => {
|
||
color = value;
|
||
textEditor?.restyle({ color });
|
||
},
|
||
setWidth: (value) => { width = value; },
|
||
setTextSize: (value) => {
|
||
textSize = value;
|
||
textEditor?.restyle({ size: value });
|
||
},
|
||
setTextFont: (value) => {
|
||
textFont = value;
|
||
textEditor?.restyle({ font: value });
|
||
},
|
||
});
|
||
|
||
// Zoom is each person's own; it changes nothing on the page.
|
||
// A reloaded tab shows the page as it was last seen in it (Andy,
|
||
// 2026-10-05: the least surprise): the zoom and the place scrolled to
|
||
// are remembered in the tab, for the page they belong to.
|
||
const viewKey = `kokkoja_view_${roomId}`;
|
||
const saveView = () => {
|
||
if (session.page.number === 0) return;
|
||
sessionStorage.setItem(viewKey, JSON.stringify({ page: session.page.id, ...renderer.view() }));
|
||
};
|
||
let viewTimer = 0;
|
||
const viewChanged = () => {
|
||
clearTimeout(viewTimer);
|
||
viewTimer = setTimeout(saveView, 300);
|
||
};
|
||
renderer.onZoomChanged = () => {
|
||
textEditor?.layout();
|
||
viewChanged();
|
||
};
|
||
// The host's Fit and A4 reach everyone (Andy, 2026-10-08); a guest's
|
||
// are the guest's own.
|
||
element('zoom_fit').addEventListener('click', () => {
|
||
renderer.fit();
|
||
session.sendViewCommand('fit');
|
||
});
|
||
element('zoom_sheet').addEventListener('click', () => {
|
||
renderer.sheetScale();
|
||
session.sendViewCommand('sheet');
|
||
});
|
||
// "Widen" makes the sheet itself wider, until it fills the window at
|
||
// the present zoom; nothing on it moves (Andy, 2026-10-08).
|
||
element('zoom_widen').addEventListener('click', () => {
|
||
const room = renderer.available().width / renderer.cssPixelsPerUnit;
|
||
const widened = session.widenPage(room);
|
||
if (widened) log(`Page widened to ${session.page.baseWidth / 100} cm`);
|
||
});
|
||
element('zoom_shrink').addEventListener('click', () => {
|
||
if (session.shrinkPage()) {
|
||
log(`Page shrunk to ${session.page.baseWidth / 100} by ${session.page.baseHeight / 100} cm`);
|
||
}
|
||
});
|
||
try {
|
||
const seen = JSON.parse(sessionStorage.getItem(viewKey) ?? 'null');
|
||
if (seen && seen.page === session.page.id && (seen.zoom === 'fit' || seen.zoom > 0) &&
|
||
Number.isFinite(seen.x) && Number.isFinite(seen.y)) {
|
||
renderer.showView(seen);
|
||
}
|
||
} catch {
|
||
// Nothing usable was remembered: the page is shown as a new one is.
|
||
}
|
||
element('desk').addEventListener('scroll', viewChanged, { passive: true });
|
||
window.addEventListener('pagehide', saveView);
|
||
|
||
// The host drives: the host starts new pages, and may let a guest do so.
|
||
function showHostTools() {
|
||
element('host_tools').hidden = !session.mayMakePages();
|
||
// The Hide tool is for the host and co-hosts; losing the right
|
||
// while it is chosen puts the pen back in hand.
|
||
const hideTool = /** @type {HTMLElement} */ (document.querySelector('[data-tool=hide]'));
|
||
hideTool.hidden = !session.mayMakePages();
|
||
if (hideTool.hidden && tool === 'hide') /** @type {HTMLElement} */ (document.querySelector('[data-tool=pen]')).click();
|
||
element('zoom_widen').hidden = !session.mayMakePages();
|
||
element('zoom_shrink').hidden = !session.mayMakePages();
|
||
}
|
||
showHostTools();
|
||
element('new_page').addEventListener('click', () => {
|
||
log('New page asked for');
|
||
session.newPage();
|
||
});
|
||
|
||
/**
|
||
* Add an image file to the page, below the images already on it, at
|
||
* its natural size; moving and scaling it is done by hand afterwards.
|
||
* @param {Blob} file
|
||
*/
|
||
async function loadImage(file) {
|
||
if (!session.mayMakePages() || session.page.number === 0) return;
|
||
try {
|
||
if (!session.addImage(await prepareImage(file))) {
|
||
throw new Error('The page has no room for another image.');
|
||
}
|
||
} catch (error) {
|
||
passingNotice(error instanceof Error && error.message ? error.message : 'That file is not an image.', true);
|
||
}
|
||
}
|
||
const chooser = new NotebookChooser((chosenNotebook, pageName, text) => {
|
||
const kept = pageFromSvg(text);
|
||
if (!kept) {
|
||
passingNotice(`${pageName} is not a Kokkoja page.`, true);
|
||
return;
|
||
}
|
||
log(`Notebook page loaded: ${chosenNotebook} / ${pageName}`);
|
||
session.loadPage(kept.page);
|
||
}, () => {
|
||
// A deleted notebook leaves the toolbar's list.
|
||
showNotebooks(sessionPicker).catch(() => {});
|
||
});
|
||
element('load_notebook_page').addEventListener('click', () => { chooser.open(writer.notebook); });
|
||
|
||
// Image files are chosen, and pictures of the page exported, through a
|
||
// chooser of our own, which begins where the notebooks are.
|
||
const fileChooser = new FileChooser();
|
||
element('load_image').addEventListener('click', async () => {
|
||
if (notebooksInBrowser()) {
|
||
// No local program to look through the files: the browser's own chooser.
|
||
const file = await pickImageFile();
|
||
if (file) loadImage(file);
|
||
return;
|
||
}
|
||
const file = await fileChooser.chooseImage();
|
||
if (file) loadImage(file);
|
||
});
|
||
|
||
/**
|
||
* Save a picture of the page as it is shown here (layers hidden on this
|
||
* screen are left out) where the user chooses.
|
||
*/
|
||
async function exportPage() {
|
||
const page = session.page;
|
||
if (page.number === 0) return;
|
||
textEditor?.stop();
|
||
// Anything still waiting to be saved is saved first, so that its
|
||
// "Saved" does not take the place of "Exported" a moment later.
|
||
await writer.writeNow();
|
||
const now = new Date();
|
||
const day = [now.getFullYear(), now.getMonth() + 1, now.getDate()]
|
||
.map((part) => String(part).padStart(2, '0')).join('_');
|
||
if (notebooksInBrowser()) {
|
||
download(`${day}_page_${page.number}.png`,
|
||
await pageToPng(page, { session: roomId, hostId: session.hostId, hidden: renderer.hidden }));
|
||
log(`Exported page ${page.number} to the downloads`);
|
||
passingNotice('Exported to your downloads');
|
||
return;
|
||
}
|
||
const saved = await fileChooser.chooseWhereToSave(
|
||
'Export', `${day}_page_${page.number}.png`,
|
||
async (directory, name, replace) => writePicture(
|
||
directory, name,
|
||
await pageToPng(page, { session: roomId, hostId: session.hostId, hidden: renderer.hidden }),
|
||
replace));
|
||
if (saved === null) return;
|
||
log(`Exported page ${page.number} to ${saved}`);
|
||
passingNotice(`Exported to ${saved}`);
|
||
}
|
||
element('export_page').addEventListener('click', () => { exportPage(); });
|
||
|
||
// The notebook: choosing one, making one, and keeping the page.
|
||
const sessionPicker = new NotebookPicker(
|
||
select('session_notebook'), input('session_notebook_name'),
|
||
(message) => { if (message) passingNotice(message, true); },
|
||
(chosen) => {
|
||
if (chosen === writer.notebook) return;
|
||
sessionStorage.setItem(notebookKey, chosen);
|
||
localStorage.setItem(NOTEBOOK_KEY, chosen);
|
||
writer.changeNotebook(chosen, (text) => {
|
||
const saved = pageFromSvg(text);
|
||
return saved !== null && saved.session === roomId && saved.page.id === session.page.id;
|
||
}).then(() => showNotebooks(sessionPicker)).catch(() => {});
|
||
});
|
||
sessionPicker.fill([], notebook);
|
||
sessionPicker.current = notebook;
|
||
showNotebooks(sessionPicker).catch(() => {});
|
||
element('keep_page').addEventListener('click', async () => {
|
||
const { kept, new: made } = await writer.keepPage();
|
||
log(kept ? `${made ? 'Kept' : 'Already kept'} as ${kept}` : 'Nothing to keep');
|
||
// In the browser the notebook is out of reach of the user's own
|
||
// programs: a page kept just now is also downloaded, which is how a
|
||
// page gets out. One already kept was downloaded then, and is not
|
||
// again (Andy, 2026-10-06: a second press should do nothing new).
|
||
if (kept && made && notebooksInBrowser()) {
|
||
const text = await readPage(writer.notebook, kept);
|
||
if (text !== null) download(kept, new Blob([text], { type: 'image/svg+xml' }));
|
||
}
|
||
});
|
||
|
||
const sessionDialog = /** @type {HTMLDialogElement} */ (element('session_dialog'));
|
||
element('session_button').addEventListener('click', () => {
|
||
showLog();
|
||
sessionDialog.showModal();
|
||
});
|
||
element('session_close').addEventListener('click', () => sessionDialog.close());
|
||
|
||
// The log in the Session window, kept current while the window is open.
|
||
const logView = element('event_log');
|
||
function showLog() {
|
||
logView.textContent = logText();
|
||
logView.scrollTop = logView.scrollHeight;
|
||
}
|
||
watchLog(() => { if (sessionDialog.open) showLog(); });
|
||
element('copy_log').addEventListener('click', async () => {
|
||
try {
|
||
await navigator.clipboard.writeText(logText());
|
||
element('copy_log').textContent = 'Copied';
|
||
setTimeout(() => { element('copy_log').textContent = 'Copy'; }, 1500);
|
||
} catch {
|
||
// The text is selectable; the user can copy it by hand.
|
||
}
|
||
});
|
||
|
||
element('copy_invitation').addEventListener('click', async () => {
|
||
const field = input('invitation');
|
||
field.select();
|
||
try {
|
||
await navigator.clipboard.writeText(field.value);
|
||
element('copy_invitation').textContent = 'Copied';
|
||
setTimeout(() => { element('copy_invitation').textContent = 'Copy'; }, 1500);
|
||
} catch {
|
||
// The field is selected; the user can copy it with the keyboard.
|
||
}
|
||
});
|
||
|
||
if (notebooksInBrowser()) {
|
||
element('keep_page').setAttribute('data-help',
|
||
'Keep a dated copy of the page as it is now in this browser’s notebook, and download it. ' +
|
||
'The page is also kept by itself whenever it is about to be replaced.');
|
||
element('export_page').setAttribute('data-help',
|
||
'Download a picture of the page, as it is shown here, as a PNG file.');
|
||
}
|
||
|
||
session.start();
|
||
// For looking at the session from the browser's console during development.
|
||
Object.assign(window, { kokkoja: {
|
||
session, renderer, writer, loadImage, textEditor,
|
||
notebook: { listNotebooks, listKeptPages, readPage, readCurrentPage, notebooksInBrowser, discardNotebook, discardPage },
|
||
} });
|
||
}
|
||
|
||
/**
|
||
* Mark one button of a group as chosen.
|
||
* @param {Element} group
|
||
* @param {Element} chosen
|
||
*/
|
||
function press(group, chosen) {
|
||
for (const button of group.querySelectorAll('button')) {
|
||
button.setAttribute('aria-pressed', String(button === chosen));
|
||
}
|
||
}
|
||
|
||
/**
|
||
* @param {object} options
|
||
* @param {string} options.color Initial color.
|
||
* @param {number} options.width Initial width.
|
||
* @param {number} options.textSize
|
||
* @param {import('./page_model.js').TextFont} options.textFont
|
||
* @param {(tool: 'pen' | 'eraser' | 'text' | 'hide') => void} options.setTool
|
||
* @param {(color: string) => void} options.setColor
|
||
* @param {(width: number) => void} options.setWidth
|
||
* @param {(size: number) => void} options.setTextSize
|
||
* @param {(font: import('./page_model.js').TextFont) => void} options.setTextFont
|
||
*/
|
||
function buildToolbar(options) {
|
||
for (const button of document.querySelectorAll('[data-tool]')) {
|
||
button.addEventListener('click', () => {
|
||
// The tool buttons stand in two groups since 2026-10-11 (Pen and
|
||
// Text before the colours they use, Eraser and Hide after), so the
|
||
// pressed one is marked among all of them, not among siblings.
|
||
for (const other of document.querySelectorAll('[data-tool]')) {
|
||
other.setAttribute('aria-pressed', String(other === button));
|
||
}
|
||
const chosen = button.getAttribute('data-tool');
|
||
options.setTool(chosen === 'eraser' ? 'eraser' : chosen === 'text' ? 'text' : chosen === 'hide' ? 'hide' : 'pen');
|
||
});
|
||
}
|
||
|
||
const colors = element('colors');
|
||
const palette = element('color_palette');
|
||
const more = element('more_colors');
|
||
|
||
/** @param {string} color */
|
||
const addSwatch = (color) => {
|
||
const button = document.createElement('button');
|
||
button.type = 'button';
|
||
button.className = 'swatch';
|
||
button.style.setProperty('--swatch', color);
|
||
button.setAttribute('aria-label', `Color ${color}`);
|
||
button.setAttribute('data-help', 'Write in this color.');
|
||
button.setAttribute('aria-pressed', String(color === options.color));
|
||
button.addEventListener('click', () => {
|
||
press(colors, button);
|
||
options.setColor(color);
|
||
});
|
||
colors.insertBefore(button, more);
|
||
return button;
|
||
};
|
||
/** @type {string[]} */
|
||
let added = [];
|
||
try {
|
||
added = JSON.parse(localStorage.getItem(COLORS_KEY) ?? '[]');
|
||
} catch {
|
||
added = [];
|
||
}
|
||
for (const color of COLORS) addSwatch(color);
|
||
for (const color of added) {
|
||
if (/^#[0-9a-f]{6}$/.test(color)) addSwatch(color);
|
||
}
|
||
|
||
// "+" opens a palette below it; a chosen colour becomes a swatch before
|
||
// the "+" and is the colour from then on.
|
||
/** @param {string} color */
|
||
const choose = (color) => {
|
||
palette.hidden = true;
|
||
const existing = [...colors.querySelectorAll('.swatch')]
|
||
.find((swatch) => swatch.getAttribute('aria-label') === `Color ${color}`);
|
||
const button = existing ?? addSwatch(color);
|
||
if (!existing) {
|
||
added.push(color);
|
||
localStorage.setItem(COLORS_KEY, JSON.stringify(added));
|
||
}
|
||
press(colors, button);
|
||
options.setColor(color);
|
||
};
|
||
// A colour that is already in the row is missing from the palette, its
|
||
// place in the grid left empty (Andy's teacher, 2026-10-08).
|
||
const inRow = () => new Set([...colors.querySelectorAll('.swatch:not(.more)')]
|
||
.map((swatch) => swatch.getAttribute('aria-label')?.replace('Color ', '')));
|
||
const showPalette = () => {
|
||
palette.replaceChildren();
|
||
const taken = inRow();
|
||
for (const color of PALETTE) {
|
||
if (taken.has(color)) {
|
||
const gap = document.createElement('span');
|
||
gap.className = 'swatch missing';
|
||
palette.append(gap);
|
||
continue;
|
||
}
|
||
const button = document.createElement('button');
|
||
button.type = 'button';
|
||
button.className = 'swatch';
|
||
button.style.setProperty('--swatch', color);
|
||
button.setAttribute('aria-label', `Color ${color}`);
|
||
button.addEventListener('click', () => choose(color));
|
||
palette.append(button);
|
||
}
|
||
};
|
||
more.addEventListener('click', () => {
|
||
if (!palette.hidden) {
|
||
palette.hidden = true;
|
||
return;
|
||
}
|
||
showPalette();
|
||
const box = more.getBoundingClientRect();
|
||
palette.style.left = `${box.left}px`;
|
||
palette.style.top = `${box.bottom + 6}px`;
|
||
palette.hidden = false;
|
||
});
|
||
document.addEventListener('pointerdown', (event) => {
|
||
if (!palette.hidden && !palette.contains(/** @type {Node} */ (event.target)) && event.target !== more) {
|
||
palette.hidden = true;
|
||
}
|
||
});
|
||
document.addEventListener('keydown', (event) => {
|
||
if (event.key === 'Escape') palette.hidden = true;
|
||
});
|
||
|
||
const widths = element('widths');
|
||
for (const width of WIDTHS) {
|
||
const button = document.createElement('button');
|
||
button.type = 'button';
|
||
button.className = 'width_choice';
|
||
button.setAttribute('aria-label', `Line width ${width / 10} mm`);
|
||
button.setAttribute('data-help', `Write with a ${width / 10} mm line. Pressing harder widens it.`);
|
||
button.setAttribute('aria-pressed', String(width === options.width));
|
||
const line = document.createElement('span');
|
||
line.style.height = `${Math.max(1, Math.round(width / 2.5))}px`;
|
||
button.append(line);
|
||
button.addEventListener('click', () => {
|
||
press(widths, button);
|
||
options.setWidth(width);
|
||
});
|
||
widths.append(button);
|
||
}
|
||
|
||
// The text size is a number of points; any size works, since the fonts
|
||
// scale. The font is one of the three generic families.
|
||
const size = input('text_size');
|
||
size.value = String(Math.round(options.textSize / UNITS_PER_POINT));
|
||
const applySize = () => {
|
||
const points = Math.max(LEAST_TEXT_POINTS, Math.min(MOST_TEXT_POINTS, Number(size.value) || 0));
|
||
size.value = String(points);
|
||
options.setTextSize(Math.round(points * UNITS_PER_POINT * 10) / 10);
|
||
};
|
||
size.addEventListener('change', applySize);
|
||
size.addEventListener('input', () => {
|
||
if (Number(size.value) >= LEAST_TEXT_POINTS) applySize();
|
||
});
|
||
|
||
const font = /** @type {HTMLSelectElement} */ (document.getElementById('text_font'));
|
||
font.value = options.textFont;
|
||
font.style.fontFamily = options.textFont;
|
||
font.addEventListener('change', () => {
|
||
const chosen = TEXT_FONTS.find((family) => family === font.value) ?? 'sans-serif';
|
||
font.style.fontFamily = chosen;
|
||
options.setTextFont(chosen);
|
||
});
|
||
}
|
||
|
||
/**
|
||
* @param {Session} session
|
||
* @param {Renderer} renderer
|
||
*/
|
||
function showParticipants(session, renderer) {
|
||
const list = element('participants');
|
||
list.replaceChildren();
|
||
for (const participant of session.participantList()) {
|
||
const item = document.createElement('li');
|
||
const present = participant.self || participant.peer !== null;
|
||
item.classList.toggle('absent', !present);
|
||
|
||
if (session.isHost && !participant.self) {
|
||
// A checkbox with its label to the left, like Extend (Andy, 2026-10-09).
|
||
const allowLine = document.createElement('label');
|
||
allowLine.className = 'allow_line';
|
||
allowLine.setAttribute('data-help', 'Make this participant a co-host: they may then start pages, put images on the page and arrange them, load notebook pages, widen, shrink and hide, as you can.');
|
||
const allow = document.createElement('input');
|
||
allow.type = 'checkbox';
|
||
allow.className = 'allow';
|
||
allow.checked = session.permitted.has(participant.id);
|
||
allow.addEventListener('change', () => session.setPermitted(participant.id, allow.checked));
|
||
allowLine.append('Co-host ', allow);
|
||
item.append(allowLine);
|
||
}
|
||
|
||
const label = document.createElement('label');
|
||
const visible = document.createElement('input');
|
||
visible.type = 'checkbox';
|
||
visible.checked = !renderer.hidden.has(participant.id);
|
||
visible.setAttribute('data-help', 'Show or hide this participant’s writing on your screen only.');
|
||
visible.addEventListener('change', () => renderer.setLayerVisible(participant.id, visible.checked));
|
||
label.append(visible, ` ${participant.name}`);
|
||
item.append(label);
|
||
|
||
const roles = [];
|
||
if (participant.self) roles.push('you');
|
||
if (participant.host) roles.push('host');
|
||
else if (!session.isHost && session.permitted.has(participant.id)) roles.push('co-host');
|
||
if (!present) roles.push('away');
|
||
if (roles.length) {
|
||
const role = document.createElement('span');
|
||
role.className = 'role';
|
||
role.textContent = roles.join(', ');
|
||
item.append(role);
|
||
}
|
||
list.append(item);
|
||
}
|
||
}
|
||
|
||
// Startup.
|
||
|
||
/** @param {any} error */
|
||
function failedToEnter(error) {
|
||
entered = false;
|
||
showStart(String(error?.message ?? error));
|
||
}
|
||
|
||
element('start_session').addEventListener('click', () => {
|
||
startSession().catch(failedToEnter);
|
||
});
|
||
element('join_session').addEventListener('click', () => {
|
||
joinSession().catch(failedToEnter);
|
||
});
|
||
|
||
/**
|
||
* Begin where this browser tab left off. A tab that was in a session and
|
||
* is reloaded goes straight back into it. A tab that arrives with an
|
||
* invitation in its address shows the start screen with the invitation
|
||
* filled in, so that the name and the notebook can be chosen.
|
||
*/
|
||
async function resume() {
|
||
const invitationText = invitationInAddress();
|
||
const invitation = parseInvitation(invitationText);
|
||
const name = localStorage.getItem(NAME_KEY);
|
||
if (invitation && name) {
|
||
const { roomId } = await deriveSession(invitation.secret);
|
||
const notebook = sessionStorage.getItem(notebookKeyFor(roomId));
|
||
if (notebook) {
|
||
await enterSession(invitationText, name, notebook);
|
||
return;
|
||
}
|
||
}
|
||
showStart();
|
||
}
|
||
|
||
enableTooltips();
|
||
guardSelection();
|
||
log(`Browser: ${navigator.userAgent}; window ${innerWidth}×${innerHeight}, pixel ratio ${devicePixelRatio}`);
|
||
|
||
const token = addressValues().get('token');
|
||
if (token) {
|
||
rememberToken(token);
|
||
setAddress(invitationInAddress());
|
||
}
|
||
|
||
/** Learn how this client was served, then begin. */
|
||
async function startUp() {
|
||
const served = await (await fetch('config.json')).json();
|
||
config = {
|
||
relay: String(served.relay ?? ''),
|
||
storage: served.storage === 'browser' ? 'browser' : 'files',
|
||
site: String(served.site ?? ''),
|
||
};
|
||
if (config.storage === 'browser') useBrowserStorage();
|
||
await resume();
|
||
}
|
||
|
||
if (!window.isSecureContext) {
|
||
showStart('Kokkoja must be opened from this computer (http://localhost) or over HTTPS.');
|
||
} else {
|
||
startUp().catch(failedToEnter);
|
||
}
|