2021-10-28 03:54:04 +03:00
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<!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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2021-10-28 17:03:04 +03:00
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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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2021-10-28 03:54:04 +03:00
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<script>
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2021-10-29 04:11:15 +03:00
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const HOLDING_THRESHOLD_MS = 300;
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2021-10-29 02:03:35 +03:00
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const SINGLE_CLICK_BUTTON_UP_MS = 5;
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2021-10-29 04:11:15 +03:00
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const SCROLL_X_THRESHOLD = 50;
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const SCROLL_Y_THRESHOLD = 5;
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2021-10-29 02:03:35 +03:00
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2021-10-28 03:54:04 +03:00
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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, logMessages=false) {
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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.logMessages = logMessages;
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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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if (this.logMessages) this.messageLog(message);
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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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2021-10-28 17:03:04 +03:00
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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.scrollXSum = 0;
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this.scrollYSum = 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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2021-10-29 02:03:35 +03:00
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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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_sendRelativeMouseMovement(dx, dy) {
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if (dx === 0 && dy === 0)
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return;
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this.connection.sendMessage("r", [dx, dy]);
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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;
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this.connection.sendMessage("s", [dx, dy]);
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}
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2021-10-29 02:03:35 +03:00
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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._sendMouseButtonDown(button);
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setTimeout(
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() => this._sendMouseButtonUp(button),
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SINGLE_CLICK_BUTTON_UP_MS
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);
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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({ touches }) {
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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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const targetTouch = touches[0];
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this.currentMoveX = targetTouch.clientX;
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this.currentMoveY = targetTouch.clientY;
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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 (touches.length === 2) {
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this.scrollXSum += 1;
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this.scrollYSum += 1;
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if (this.scrollXSum > SCROLL_X_THRESHOLD) {
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this._sendRelativeMouseScroll(deltaX, 0);
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this.scrollXSum = 0;
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}
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if (this.scrollYSum > SCROLL_Y_THRESHOLD) {
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this._sendRelativeMouseScroll(0, deltaY);
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this.scrollYSum = 0;
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}
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} else {
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this._sendRelativeMouseMovement(deltaX, deltaY);
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}
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2021-10-28 17:03:04 +03:00
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}
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onTouchEnd({ changedTouches }) {
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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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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({ changedTouches }) {
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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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2021-10-28 17:03:04 +03:00
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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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};
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}
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}
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}
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const connection = new Connection(`ws://${location.host}/gateway`, true);
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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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2021-10-28 03:54:04 +03:00
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}
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</script>
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<style>
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.touchpad {
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width: 75vw;
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height: 50vh;
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background-color: blue;
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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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2021-10-28 17:03:04 +03:00
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<div class="touchpad"></div>
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</body>
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</html>
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