325 lines
No EOL
12 KiB
HTML
325 lines
No EOL
12 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="user-scalable=no, width=device-width, initial-scale=1, maximum-scale=1"> <title>Document</title>
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<script>
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"use strict";
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const domlog = message => document.body.appendChild(document.createTextNode(message));
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window.onerror = e => domlog(` ERROR - ${e} `);
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const HOLDING_THRESHOLD_MS = 300;
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const SCROLL_X_DAMPENING = 0.03;
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const SCROLL_Y_DAMPENING = 0.09;
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const loggerOfType = (components, type='log') => (...args) => {
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let str = '%c';
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const style = 'color: #5e81ac; font-weight: bold;';
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for (const i in components) {
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const v = components[i];
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if (components[i+1] === undefined) {
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str += `[${v}]`;
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} else {
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str += `[${v}] `;
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}
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}
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switch (type) {
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case 'log': {
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console.log(str, style, ...args);
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break;
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}
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case 'error': {
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console.error(str, style, ...args);
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break;
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}
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case 'warn': {
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console.warn(str, style, ...args);
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break;
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}
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case 'genmsg': {
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return str;
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}
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default: {
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return str;
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}
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}
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};
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function Logger(components, types=['warn', 'error', 'log']) {
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const loggerObj = {};
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for (const type of types) {
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loggerObj[type] = loggerOfType(components, type);
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}
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return loggerObj;
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}
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class Connection {
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constructor(url) {
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this.ws = null;
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this.log = Logger(["Connection"], ["log"]).log;
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this.messageLog = Logger(["Connection", "Message"], ["log"]).log;
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this.url = url;
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}
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connect() {
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this.ws = new WebSocket(this.url);
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this.ws.onerror = (e) => this.log("Error", e);
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this.ws.onopen = () => {
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this.log("Open");
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};
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this.ws.onclose = () => {
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this.log("Closed - attempting to reconnect in 4000ms");
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setTimeout(() => this.connect(), 4000);
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}
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}
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sendMessage(code, params=[]) {
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let message = code;
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params.forEach((param, i) => {
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if (i == params.length - 1)
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message += param;
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else
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message += param + ";";
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});
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this.ws.send(message);
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return message;
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}
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disconnect() {
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this.ws.close();
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}
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}
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class TouchpadController {
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constructor(connection) {
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this.currentMoveX = 0;
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this.currentMoveY = 0;
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this.lastMoveX = 0;
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this.lastMoveY = 0;
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this.shouldResetLastMove = false;
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this.isInHoldingMode = false;
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this.ongoingTouches = {};
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this.holdModeTimeout = null;
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this.log = Logger(["TouchpadController"], ["log"]).log;
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this.connection = connection;
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}
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getButtonCode(button) {
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let buttonCode = 0;
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if (button === "right") buttonCode = 1;
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return buttonCode;
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}
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// takes a gesture name and a touch list
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// adds the gesture name to the touch and returns false if that touch already had that gesture
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_gesture(gestureName, touchList) {
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for (let i = 0; i < touchList.length; i++) {
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const touch = this.ongoingTouches[touchList[i].identifier];
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if (touch.gestured.includes(gestureName)) return false;
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touch.gestured.push(gestureName);
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}
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return true;
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}
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_sendRelativeMouseMovement(dx, dy) {
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if (dx === 0 && dy === 0)
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return false;
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this.connection.sendMessage("r", [dx, dy]);
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return true;
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}
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_sendRelativeMouseScroll(dx, dy) {
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if (dx === 0 && dy === 0)
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return false;
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this.connection.sendMessage("s", [dx, dy]);
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return true;
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}
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_sendMouseButtonDown(button="left") {
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this.connection.sendMessage("d", [this.getButtonCode(button)]);
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}
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_sendMouseButtonUp(button="left") {
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this.connection.sendMessage("u", [this.getButtonCode(button)]);
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}
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_sendSingleClick(button="left") {
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this.connection.sendMessage("c", [this.getButtonCode(button)]);
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}
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bindTo(element) {
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element.addEventListener("touchmove", this.onTouchMove.bind(this));
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element.addEventListener("touchend", this.onTouchEnd.bind(this));
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element.addEventListener("touchstart", this.onTouchStart.bind(this));
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}
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onTouchMove(event) {
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const touches = event.changedTouches;
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event.preventDefault();
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event.stopPropagation();
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const targetTouch = touches[0];
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this.currentMoveX = targetTouch.pageX;
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this.currentMoveY = targetTouch.pageY;
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// When ending a touch and starting a new one in another part of the touchpad,
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// the cursor "rubber bands" to that position.
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// To solve this, the "last move" parameters are reset when a touch is ended
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// (see onTouchEnd())
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if (this.shouldResetLastMove) {
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this.shouldResetLastMove = false;
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this.lastMoveX = this.currentMoveX;
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this.lastMoveY = this.currentMoveY;
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}
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const deltaX = this.currentMoveX - this.lastMoveX;
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const deltaY = this.currentMoveY - this.lastMoveY;
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this.lastMoveX = this.currentMoveX;
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this.lastMoveY = this.currentMoveY;
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// if two touches moved at the same time, assume scrolling intent
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// if _sendRelativeMouseScroll or _sendRelativeMouseMovement return true, it means that the delta values are non-zero and a packet has been sent to the server
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// in that case, the touches will be marked as moved
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let shouldMarkTouchesAsMoved = false;
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if (touches.length === 2) {
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if (
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this._sendRelativeMouseScroll(deltaX * SCROLL_X_DAMPENING, deltaY * SCROLL_Y_DAMPENING)
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) {
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shouldMarkTouchesAsMoved = true;
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}
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} else if (touches.length === 3 && this._gesture("GESTURE_RIGHT_CLICK", touches)) {
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shouldMarkTouchesAsMoved = true;
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this._sendSingleClick("right");
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} else {
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if (
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this._sendRelativeMouseMovement(deltaX, deltaY)
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) {
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shouldMarkTouchesAsMoved = true;
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}
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}
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if (shouldMarkTouchesAsMoved) {
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for (let i = 0; i < touches.length; i++) {
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this.ongoingTouches[touches[i].identifier].hasMoved = true;
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}
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}
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}
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onTouchEnd(event) {
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const changedTouches = event.changedTouches;
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event.preventDefault();
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event.stopPropagation();
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this.shouldResetLastMove = true;
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if (changedTouches.length === 1) {
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// This is a single tap - left click
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if (!this.ongoingTouches[changedTouches[0].identifier].hasMoved) {
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this._sendSingleClick("left");
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// We were in "holding mode" and now that touch event has ended,
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// thus we have to stop holding the left click button
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} else if (this.isInHoldingMode) {
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this._sendMouseButtonUp("left");
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this.isInHoldingMode = false;
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}
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}
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// remove all ended touches
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for (let i = 0; i < changedTouches.length; i++) {
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const touch = changedTouches[i];
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this.ongoingTouches[touch.identifier] = null;
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delete this.ongoingTouches[touch.identifier];
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}
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}
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onTouchStart(event) {
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const changedTouches = event.changedTouches;
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event.preventDefault();
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event.stopPropagation();
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// Clear the hold mode time out if another touch begins
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if (this.holdModeTimeout)
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clearTimeout(this.holdModeTimeout);
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// If the touch is still unmoved and held for a certain amount of time,
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// we will enter "holding mode" which keeps the mouse button held while dragging
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// allowing you to, for example, select text or drag a scrollbar
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if (changedTouches.length === 1) {
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const targetTouch = changedTouches[0];
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this.holdModeTimeout = setTimeout(() => {
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if (this.ongoingTouches[targetTouch.identifier] && !this.ongoingTouches[targetTouch.identifier].hasMoved) {
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this.isInHoldingMode = true;
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this._sendMouseButtonDown("left");
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}
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}, HOLDING_THRESHOLD_MS);
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}
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for (let i = 0; i < changedTouches.length; i++) {
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const touch = changedTouches[i];
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this.ongoingTouches[touch.identifier] = {
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identifier: touch.identifier,
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clientX: touch.clientX,
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clientY: touch.clientY,
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hasMoved: false,
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gestured: []
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};
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}
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}
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}
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const connection = new Connection(`ws://${location.host}/gateway`);
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const controller = new TouchpadController(connection);
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function main() {
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connection.connect();
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controller.bindTo(document.querySelector(".touchpad"));
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}
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</script>
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<style>
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:root {
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--body-bg-color: #2e2e2e;
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--accent-bg-color: #d4d3d3;
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--accent-color: #949494;
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--grayed-text-color: #949494;
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--button-accent-color: #3d3d3d;
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--selected-bg-color: #2e2e2e;
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--hover-bg-color: #4d4d4d;
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--card-border-radius: 1rem;
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--button-border-radius: 0.5rem;
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--main-font-weight: 500;
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--fonts-regular: "Noto Sans", "Liberation Sans", sans-serif;
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}
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body {
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font-weight: var(--main-font-weight);
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font-family: var(--fonts-regular);
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background-color: var(--body-bg-color);
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color: var(--accent-bg-color);
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margin: 0;
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padding: 24px;
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}
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.touchpad {
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height: 30rem;
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width: 100%;
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background-color: var(--accent-bg-color);
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border-radius: var(--card-border-radius);
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}
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</style>
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</head>
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<body onload="main();">
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<div class="touchpad"></div>
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</body>
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</html> |