299 lines
9.2 KiB
XML
299 lines
9.2 KiB
XML
<?xml version="1.0"?>
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<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
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"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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<svg version="1.1"
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xmlns="http://www.w3.org/2000/svg"
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xmlns:xlink="http://www.w3.org/1999/xlink"
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width="300"
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height="500"
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viewBox="0 0 300 500"
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onload="start_chat('Ven')"
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overflow="auto"
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>
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<defs>
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<symbol id="left_chat_message"><text style="text-align: left"></text></symbol>
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<symbol id="right_chat_message"><text style="text-align: right"></text></symbol>
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</defs>
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<script type="application/ecmascript">
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<![CDATA[
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const svgns = "http://www.w3.org/2000/svg";
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// must be the same as the SVG dimensions
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const width = 300;
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const height = 500;
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const line_height = 5;
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const max_visible_lines = 10;
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const messages_y_offset = 20;
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const typing_speed = 70;
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var chat_lines_count = 0;
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var conversation_count = 0;
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/// SVG 1.1 doesn't do proper text splitting into several lines.
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/// we need to do it ourselves.
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function split_text_into_lines(text, upper_line_length) {
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let result = [];
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while(text.length) {
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if(text.length < upper_line_length) {
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result.push(text);
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break; // we are done
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}
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let found_split_point = false;
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for(let i = upper_line_length; i; i--) {
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if(text[i] == ' ') {
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result.push(text.slice(0, i));
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text = text.slice(i+1);
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found_split_point = true;
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break;
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}
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}
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if(!found_split_point) {
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// no <space> found. Split at character boundary instead
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result.push(text.slice(0, upper_line_length));
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text = text.slice(upper_line_length);
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}
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}
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return result;
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}
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/// A class holding a chat message.
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///
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/// ChatMessages's are owned by a Dialog.
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function ChatMessage(message_text, is_myself) {
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let lines = split_text_into_lines(message_text, 28);
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let tspans = []
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let bubbles = [];
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let container = document.getElementById('messages');
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/// Render the chat message on the screen
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this.draw = function() {
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let text = document.createElementNS(svgns, 'text');
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let x = (is_myself ? 190 : 110);
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text.setAttribute('x', `${x}%`);
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text.setAttribute('font-size', '14px');
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text.setAttribute('text-anchor', is_myself ? 'end' : 'start');
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lines.forEach(function(line) {
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let y = tspan_y_pos(chat_lines_count++);
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let tspan = document.createElementNS(svgns, 'tspan');
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tspan.setAttribute('x', `${x}%`);
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tspan.setAttribute('y', `${y}%`); // important: y is lower text baseline
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tspan.setAttribute('z', 10);
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tspan.appendChild(document.createTextNode(line));
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tspan.setAttribute('fill', 'green');
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tspan.setAttribute('width', '5%');
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text.appendChild(tspan);
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tspans.push(tspan);
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});
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// done making text
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// it must be in the DOM for getBBox() to work
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container.appendChild(text);
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// make chat bubble
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const padding = 7;
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const textbox = text.getBBox();
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const y_percent = Math.round(((textbox.y - padding) / height) * 100);
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const bubble = document.createElementNS(svgns, 'rect');
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bubble.setAttribute('x', textbox.x-padding);
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bubble.setAttribute('y', `${y_percent}%`);
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bubble.setAttribute('width', textbox.width + 2*padding);
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bubble.setAttribute('height', textbox.height + 2*padding);
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bubble.setAttribute('rx', 8);
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bubble.setAttribute('fill', 'black');
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bubbles.push(bubble);
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// put stuff in dom in the right order
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container.appendChild(bubble);
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container.removeChild(text);
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container.appendChild(text);
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}
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/// Move a chat message on the screen (to simulate scrolling)
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this.shift_y_pos = function(by, lower_visibility_boundary) {
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tspans.forEach(tspan => {
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let is_already_hidden = tspan.getAttribute('visibility') == 'hidden';
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let old = parseInt(tspan.getAttribute('y').split('%')[0]);
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let new_value = old + by;
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tspan.setAttribute('y', `${new_value}%`);
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let visibility;
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if(new_value < lower_visibility_boundary) {
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visibility = 'hidden';
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if(!is_already_hidden) {
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chat_lines_count--;
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}
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} else {
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visibility = 'visible';
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if(is_already_hidden) {
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chat_lines_count++;
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}
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}
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tspan.setAttribute('visibility', visibility);
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});
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bubbles.forEach(bubble => {
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const old = parseInt(bubble.getAttribute('y').split('%')[0]);
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const new_value = old + by;
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bubble.setAttribute('y', `${new_value}%`);
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});
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}
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}
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/// Helper function to determine the position of a chat-tspan
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function tspan_y_pos(message_index) {
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return messages_y_offset + message_index * line_height;
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}
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/// Promise-based version of setTimeout
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const wait = (ms) => new Promise((resolve) => setTimeout(resolve, ms));
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/// toggle viewport between message list and contact list
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/// That means: show either the left or right side of the SVG
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function swipe_viewport() {
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let svg = document.getElementsByTagName('svg')[0];
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let coords = svg.getAttribute('viewBox').split(' ');
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let x = parseInt(coords.shift());
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if(x == 0) {
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// moving from messages to contacts
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var step = 5;
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var end = width;
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} else {
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// moving from contacts to messages
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var step = -5;
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var end = 0;
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}
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let viewBox_suffix = coords.join(' '); // only 3 elements
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async function animate(resolve, reject) {
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while(x!=end) {
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await wait(1);
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x += step;
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svg.setAttribute('viewBox', `${x} ${viewBox_suffix}`);
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}
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resolve();
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};
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new Promise(animate);
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}
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function removeAllChildren(parentNode) {
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while(parentNode.firstChild) {
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parentNode.removeChild(parentNode.lastChild);
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}
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}
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function start_chat(who) {
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let indicator = document.getElementById('contact_indicator');
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indicator.childNodes[0].data = `Kontakt: ${who}`;
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removeAllChildren(document.getElementById('messages'));
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chat_lines_count = 0;
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swipe_viewport();
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switch(who) {
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case 'Ven':
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dialog_ven();
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break;
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case 'Mor':
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dialog_mor();
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break;
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case 'Kæreste':
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dialog_kaereste();
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break;
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default:
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alert(`Unknown contact: ${who}`);
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}
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}
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function Dialog(chat_partner) {
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let conversation_id = ++conversation_count;
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this.messages = [];
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async function post_message(dialog, message, is_myself) {
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if(dialog.messages.length) await wait(message.length * typing_speed); // first message should be instant
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if(conversation_id != conversation_count) {
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return; // Do not add messages to old conversation
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}
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let chat_message = new ChatMessage(message, is_myself);
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chat_message.draw();
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dialog.messages.push(chat_message);
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while(chat_lines_count > max_visible_lines) {
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dialog.messages.forEach(msg => msg.shift_y_pos(-line_height, messages_y_offset));
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await wait(50);
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}
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}
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this.me = async function(message) {
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await post_message(this, message, true);
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}
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this.you = async function(message) {
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await post_message(this, message, false);
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}
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}
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async function dialog_ven() {
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let d = new Dialog('Ven');
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await d.me("hej");
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await d.you("tak for sidst!");
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await d.you('Har du hørt om den nye EU lov "ChatControl"?');
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await d.me("nej, det har jeg ikke");
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await d.me("hvad handler det om?");
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await d.you('EU kommissionen planlægger at læse alle chatbeskeder i EU');
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await d.me('Ja, men vi krypterer jo vores beskeder? Tough luck!');
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await d.you('Det tager de højde for. Aflytningen vil ske før krypteringen på din telefon!');
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await d.me('Det lyder overhovedet ikke rart. Hvorfor vil de gøre det?');
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await d.you('De siger at det er for at beskytte børn på nettet.');
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await d.you('Men det giver ikke meget mening');
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await d.me('Alle vores beskeder skal scannes på grund af børn på nettet? Det lyder dumt!');
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await d.you('Her kan du læse mere om det:');
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await d.you('https://chatcontrol.eu');
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}
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async function dialog_mor() {
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let d = new Dialog('Mor');
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await d.you("Jeg har fundet nogle gamle familiebilleder fra vores ferie 10 år siden");
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await d.you("Her leger du på stranden");
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await d.you("(naked stick figure image here)");
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}
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async function dialog_kaereste() {
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let d = new Dialog('Kæreste');
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await d.me('hej smukkeste');
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await d.you('hej, jeg har lige tænkt på dig!');
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await d.you('og derfor har jeg taget et sexet billede');
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await d.you('(silly naked stick figure image here)')
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}
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]]>
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</script>
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<!-- [right] contact name view -->
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<rect x="100%" y="0" width="100%" height="10%" fill="yellow" />
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<polyline points="300,20 320,0 320,40" fill="blue" onclick="swipe_viewport()" /> <!-- XXX: these polyline points depend on the svg width -->
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<text x="125%" y="30" id="contact_indicator">loading...</text>
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<!-- [right] messages view -->
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<rect x="100%" y="10%" width="100%" height="90%" style="stroke: green; stroke-width: 10px" fill="blue" />
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<rect id="messages_background" x="105%" y="15%" z="2" width="90%" height="85%" fill="pink" />
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<g id="messages"></g>
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<!-- [left] contact list -->
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<rect x="0" y="0" width="100%" height="10%" fill="yellow" />
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<text x="20%" y="30">Dine kontakter</text>
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<rect x="0" y="10%" width="100%" height="100%" style="stroke: green; stroke-width: 10px" fill="aqua" />
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<text x="5%" y="15%" onclick="start_chat('Ven')">Ven</text>
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<text x="5%" y="20%" onclick="start_chat('Mor')">Mor</text>
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<text x="5%" y="25%" onclick="start_chat('Kæreste')">Kæreste❤</text>
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</svg>
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