ackandClaude Fable 5.1
95c80d04c9
Assembled from the development repository by tools/make_release.sh. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
959 lines
35 KiB
JavaScript
959 lines
35 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, 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 { 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, ZOOM_STEP } from './renderer.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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const COLORS = ['#1c1c1e', '#1f4fd8', '#d42a2a', '#1c8a3c'];
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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). */
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const WIDTHS = [4, 7, 12];
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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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* 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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const DEFAULT_NOTEBOOK = '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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* 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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input('notebook').value = localStorage.getItem(NOTEBOOK_KEY) ?? DEFAULT_NOTEBOOK;
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const pending = invitationInAddress();
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if (pending) input('invitation_entry').value = 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().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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/** Offer the existing notebooks and say where notebooks are kept. */
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async function showNotebooks() {
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const { directory, notebooks } = await listNotebooks();
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const choices = element('notebook_choices');
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choices.replaceChildren();
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for (const notebook of notebooks) {
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const option = document.createElement('option');
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option.value = notebook;
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choices.append(option);
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}
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for (const note of document.querySelectorAll('.notebook_directory')) {
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note.textContent = directory ? `Notebooks are kept in ${directory}`
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: 'Notebooks are kept in this browser, on this computer. “Keep page” also downloads the page.';
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note.classList.remove('problem');
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}
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}
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/**
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* The part of the page address after '#', as named values. The local
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* program puts the token there; a join link puts the invitation there.
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* Browsers do not send this part of an address to any server.
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*/
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function addressValues() {
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return new URLSearchParams(location.hash.slice(1));
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}
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/** @returns {string} The invitation in the page address, or ''. */
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function invitationInAddress() {
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return addressValues().get('join') ?? '';
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}
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/**
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* Set the page address for a session, or for none.
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* @param {string} [invitation]
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*/
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function setAddress(invitation) {
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history.replaceState(null, '', invitation
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? `#join=${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 entered. */
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function enteredNotebook() {
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const notebook = input('notebook').value.trim() || 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;
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element('session').hidden = false;
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// The invitation is shown as a link to the web site when there is one,
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// so that a guest can open it and be in the session with nothing
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// installed. The link carries the invitation itself.
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const plainInvitation = formatInvitation(invitation);
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input('invitation').value = config.site ? formatInvitationLink(config.site, plainInvitation) : plainInvitation;
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const isHost = identity.id === invitation.hostId;
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let tool = /** @type {'pen' | 'eraser' | 'text'} */ ('pen');
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let color = DEFAULT_COLOR;
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let width = WIDTHS[1];
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let textSize = TEXT_SIZE;
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let textFont = /** @type {import('./page_model.js').TextFont} */ ('sans-serif');
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/** @type {Renderer} */
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let renderer;
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let layerOrder = '';
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function syncLayers() {
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const order = session.layerOrder();
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if (order.join(' ') === layerOrder) return;
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layerOrder = order.join(' ');
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renderer.setLayerOrder(order);
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}
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/**
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* @param {import('./page_model.js').Page} page
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* @returns {string} The page file.
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*/
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const fileOf = (page) => pageToSvg(page, { session: roomId, hostId: invitation.hostId });
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function showPageNumber() {
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element('page_number').textContent = session.page.number > 0
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? `Page ${session.page.number}` : 'Waiting for the host’s page';
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}
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const session = new Session(
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{
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relay: invitation.relay, roomId, key, identity, hostId: invitation.hostId, name,
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page: savedPage,
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},
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{
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onLayerReplaced: (layerId) => {
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syncLayers();
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renderer.redrawLayer(layerId);
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writer.changed();
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},
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onStrokeProgress: (layerId, stroke) => {
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syncLayers();
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renderer.strokeProgress(layerId, stroke);
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if (stroke.done) writer.changed();
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},
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onTextChanged: (layerId) => {
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syncLayers();
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renderer.redrawLayer(layerId);
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writer.changed();
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},
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onPageReplaced: (oldPage, newPage) => {
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textEditor?.stop();
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// Nothing is lost: the page being left is kept in the notebook.
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writer.pageReplaced(oldPage.number > 0 ? fileOf(oldPage) : null);
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renderer.setPage(newPage);
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layerOrder = '';
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syncLayers();
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showParticipants(session, renderer);
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showPageNumber();
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},
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onImagesChanged: () => {
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renderer.showImages();
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writer.writeNow();
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},
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onPageResized: (byImages) => {
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// An image added or taken back does not rescale what is in view.
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if (byImages) renderer.holdScale();
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renderer.resize();
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textEditor?.layout();
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writer.changed();
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},
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onPermissionsChanged: () => {
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showHostTools();
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showParticipants(session, renderer);
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},
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onParticipantsChanged: () => {
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syncLayers();
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showParticipants(session, renderer);
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},
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onStatus: (status, detail) => {
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const text = { connecting: 'Connecting…', connected: 'Connected', failed: detail ?? 'Disconnected' };
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element('status').textContent = text[status];
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element('status').classList.toggle('problem', status !== 'connected');
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},
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});
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const writer = new NotebookWriter(
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notebook,
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() => (session.page.number > 0 ? fileOf(session.page) : null),
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(message, problem) => {
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element('save_status').textContent = message;
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element('save_status').classList.toggle('problem', problem);
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});
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element('save_status').textContent = savedPage ? 'Continued from the notebook' : '';
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const pageElement = element('page');
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renderer = new Renderer(pageElement, session.page);
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/** @type {TextEditor | null} */
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let textEditor = null;
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syncLayers();
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for (const layerId of session.page.layers.keys()) renderer.redrawLayer(layerId);
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showParticipants(session, renderer);
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showPageNumber();
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new ResizeObserver(() => {
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renderer.resize();
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textEditor?.layout();
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}).observe(/** @type {Element} */ (pageElement.parentElement));
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textEditor = new TextEditor(pageElement, renderer, {
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setText: (block) => session.setText(block),
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removeText: (id) => session.removeTexts([id]),
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});
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attachPenInput(pageElement, {
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toPage: (clientX, clientY) => renderer.pageFromClient(clientX, clientY),
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tool: () => tool,
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canWrite: () => session.page.number > 0,
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beginStroke: () => {
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textEditor?.stop();
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renderer.holdFit = true;
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session.beginStroke(color, width);
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},
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addPoints: (points) => session.addPoints(points),
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endStroke: () => {
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session.endStroke();
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renderer.holdFit = false;
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if (renderer.zoom === 'fit') renderer.resize();
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},
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eraseAlong: (x0, y0, x1, y1) => {
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textEditor?.stop();
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const radius = renderer.pageLength(ERASER_RADIUS);
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session.erase(strokesTouched(session.ownLayer, x0, y0, x1, y1, radius));
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session.removeTexts(textsTouched(session.ownLayer, x0, y0, x1, y1, radius));
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},
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eraseEnded: (x, y, reach) => {
|
||
// A tap of the eraser on the image we have just added takes it back.
|
||
const image = session.removableImage;
|
||
if (image && reach < TAP_DISTANCE && x >= image.x && x <= image.x + image.width &&
|
||
y >= image.y && y <= image.y + image.height) {
|
||
session.removeAddedImage();
|
||
}
|
||
},
|
||
previewText: (x0, y0, x1) => {
|
||
if (Math.abs(x1 - x0) >= TAP_DISTANCE) textEditor?.showPreview(x0, y0, x1);
|
||
else textEditor?.hidePreview();
|
||
},
|
||
placeText: (x0, y0, x1, y1) => {
|
||
if (!textEditor) return;
|
||
textEditor.hidePreview();
|
||
const editing = textEditor.block;
|
||
textEditor.stop();
|
||
const own = textAt(session.ownLayer, x0, y0);
|
||
if (Math.hypot(x1 - x0, y1 - y0) < TAP_DISTANCE) {
|
||
// A tap: into our own text to change it, or a new block here.
|
||
if (own && own !== editing) textEditor.edit(own);
|
||
else if (!own) textEditor.begin(x0, y0, null, { color, size: textSize, font: textFont });
|
||
} else {
|
||
// A drag along the top edge: a new block that wraps at its width.
|
||
textEditor.begin(Math.min(x0, x1), y0, Math.max(100, Math.round(Math.abs(x1 - x0))),
|
||
{ color, size: textSize, font: textFont });
|
||
}
|
||
},
|
||
onReport: (report) => {
|
||
element('pen_report').textContent =
|
||
`Input: ${report.pointerType}, pressure ${report.pressure.toFixed(2)}, ` +
|
||
`${report.pointsPerSecond} points per second`;
|
||
},
|
||
});
|
||
|
||
buildToolbar({
|
||
color, width, textSize, textFont,
|
||
setTool: (value) => {
|
||
if (value !== 'text') textEditor?.stop();
|
||
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';
|
||
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.
|
||
const showZoom = () => {
|
||
element('zoom_fit').setAttribute('aria-pressed', String(renderer.zoom === 'fit'));
|
||
};
|
||
// 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 = () => {
|
||
showZoom();
|
||
textEditor?.layout();
|
||
viewChanged();
|
||
};
|
||
element('zoom_fit').addEventListener('click', () => renderer.setZoom('fit'));
|
||
element('zoom_in').addEventListener('click', () => renderer.zoomBy(ZOOM_STEP));
|
||
element('zoom_out').addEventListener('click', () => renderer.zoomBy(1 / ZOOM_STEP));
|
||
showZoom();
|
||
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();
|
||
}
|
||
showHostTools();
|
||
element('new_page').addEventListener('click', () => session.newPage());
|
||
|
||
/**
|
||
* Add an image file to the page, below the images already on it.
|
||
* @param {Blob} file
|
||
* @param {boolean} [shrink] Whether an image wider than the sheet is
|
||
* scaled down to it.
|
||
*/
|
||
async function loadImage(file, shrink = true) {
|
||
if (!session.mayMakePages() || session.page.number === 0) return;
|
||
try {
|
||
if (!session.addImage(await prepareImage(file), shrink)) {
|
||
throw new Error('The page has no room for another image.');
|
||
}
|
||
} catch (error) {
|
||
element('save_status').textContent =
|
||
error instanceof Error && error.message ? error.message : 'That file is not an image.';
|
||
element('save_status').classList.add('problem');
|
||
}
|
||
}
|
||
const chooser = new NotebookChooser((chosenNotebook, pageName, text) => {
|
||
const kept = pageFromSvg(text);
|
||
if (!kept) {
|
||
element('save_status').textContent = `${pageName} is not a Kokkoja page.`;
|
||
element('save_status').classList.add('problem');
|
||
return;
|
||
}
|
||
session.loadPage(kept.page);
|
||
});
|
||
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, fileChooser.shrinksWideImages());
|
||
});
|
||
|
||
/**
|
||
* 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 }));
|
||
element('save_status').textContent = 'Exported to your downloads';
|
||
element('save_status').classList.remove('problem');
|
||
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;
|
||
element('save_status').textContent = `Exported to ${saved}`;
|
||
element('save_status').classList.remove('problem');
|
||
}
|
||
element('export_page').addEventListener('click', () => { exportPage(); });
|
||
|
||
// The notebook: its name, and keeping the page.
|
||
const notebookField = input('session_notebook');
|
||
notebookField.value = notebook;
|
||
showNotebooks().catch(() => {});
|
||
notebookField.addEventListener('change', () => {
|
||
const chosen = notebookField.value.trim();
|
||
if (!chosen || chosen === writer.notebook) {
|
||
notebookField.value = 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()).catch(() => {});
|
||
});
|
||
element('keep_page').addEventListener('click', async () => {
|
||
const kept = await writer.keepPage();
|
||
// In the browser the notebook is out of reach of the user's own
|
||
// programs: a kept page is also downloaded, which is how a page gets out.
|
||
if (kept && notebooksInBrowser()) {
|
||
const text = await readPage(writer.notebook, kept);
|
||
if (text !== null) download(kept, new Blob([text], { type: 'image/svg+xml' }));
|
||
}
|
||
});
|
||
|
||
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 },
|
||
} });
|
||
}
|
||
|
||
/**
|
||
* 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') => 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', () => {
|
||
press(/** @type {Element} */ (button.parentElement), button);
|
||
const chosen = button.getAttribute('data-tool');
|
||
options.setTool(chosen === 'eraser' ? 'eraser' : chosen === 'text' ? 'text' : '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);
|
||
};
|
||
for (const color of PALETTE) {
|
||
const button = document.createElement('button');
|
||
button.type = 'button';
|
||
button.className = 'swatch';
|
||
button.style.setProperty('--swatch', color);
|
||
button.setAttribute('aria-label', `Color ${color}`);
|
||
button.addEventListener('click', () => choose(color));
|
||
palette.append(button);
|
||
}
|
||
more.addEventListener('click', () => {
|
||
if (!palette.hidden) {
|
||
palette.hidden = true;
|
||
return;
|
||
}
|
||
const box = more.getBoundingClientRect();
|
||
palette.style.left = `${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) {
|
||
const allow = document.createElement('button');
|
||
allow.type = 'button';
|
||
allow.className = 'allow';
|
||
allow.textContent = 'pages';
|
||
allow.setAttribute('data-help', 'Let this participant start new pages and load images.');
|
||
const allowed = session.permitted.has(participant.id);
|
||
allow.setAttribute('aria-pressed', String(allowed));
|
||
allow.addEventListener('click', () => session.setPermitted(participant.id, !allowed));
|
||
item.append(allow);
|
||
}
|
||
|
||
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');
|
||
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();
|
||
|
||
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);
|
||
}
|