385 lines
12 KiB
JavaScript
385 lines
12 KiB
JavaScript
/*
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* Copyright (c) 2018 Unrud<unrud@outlook.com>
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*
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* This file is part of Remote-Touchpad.
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*
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* Foobar is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Remote-Touchpad is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Foobar. If not, see <http://www.gnu.org/licenses/>.
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*/
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// [1 Touch, 2 Touches, 3 Touches]
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const TOUCH_MOVE_THRESHOLD = [10, 15, 15];
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const TOUCH_TIMEOUT = 250;
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const MOVE_MULT = 1;
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const SCROLL_MULT = 0.05;
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// [[px/s, mult], ...]
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const POINTER_ACCELERATION = [[0, 0], [87, 1], [173, 1], [553, 2]];
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const UPDATE_INTERVAL = 50;
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const MAX_IDLE_UPDATES = 10;
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var ws;
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var pad;
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var padlabel;
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var touchMoved = false;
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var touchStart = 0;
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var touchLastEnd = 0;
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var touchReleasedCount = 0;
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var ongoingTouches = [];
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var moveXSum = 0;
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var moveYSum = 0;
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var scrollXSum = 0;
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var scrollYSum = 0;
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var dragging = false;
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var draggingTimeout = null;
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var updateTimer = null;
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var idleUpdates = 0;
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function fullscreenEnabled() {
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return (document.fullscreenEnabled ||
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document.webkitFullscreenEnabled ||
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document.mozFullScreenEnabled ||
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document.msFullscreenEnabled ||
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false);
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}
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function requestFullscreen(e) {
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if (e.requestFullscreen) {
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e.requestFullscreen();
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} else if (e.webkitRequestFullscreen) {
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e.webkitRequestFullscreen();
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} else if (e.mozRequestFullScreen) {
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e.mozRequestFullScreen();
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} else if (e.msRequestFullscreen) {
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e.msRequestFullscreen();
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}
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}
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function exitFullscreen() {
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if (document.exitFullscreen) {
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document.exitFullscreen();
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} else if (document.webkitExitFullscreen) {
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document.webkitExitFullscreen();
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} else if (document.mozCancelFullScreen) {
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document.mozCancelFullScreen();
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} else if (document.msExitFullscreen) {
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document.msExitFullscreen();
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}
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}
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function fullscreenElement() {
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return (document.fullscreenElement ||
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document.webkitFullscreenElement ||
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document.mozFullScreenElement ||
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document.msFullscreenElement ||
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null);
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}
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function addFullscreenchangeEventListener(listener) {
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if (document.fullscreenElement !== undefined) {
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document.addEventListener("fullscreenchange", listener);
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} else if (document.webkitFullscreenElement !== undefined) {
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document.addEventListener("webkitfullscreenchange", listener);
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} else if (document.mozFullScreenElement !== undefined) {
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document.addEventListener("mozfullscreenchange", listener);
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} else if (document.msFullscreenElement !== undefined) {
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document.addEventListener("MSFullscreenChange", listener);
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}
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}
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function copyTouch(touch, timeStamp) {
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return {
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identifier: touch.identifier,
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pageX: touch.pageX,
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pageXStart: touch.pageX,
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pageY: touch.pageY,
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pageYStart: touch.pageY,
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timeStamp: timeStamp
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};
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}
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function ongoingTouchIndexById(idToFind) {
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for (var i = 0; i < ongoingTouches.length; i++) {
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var id = ongoingTouches[i].identifier;
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if (id == idToFind) {
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return i;
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}
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}
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return -1;
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}
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function calculatePointerAccelerationMult(speed) {
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for (var i = 0; i < POINTER_ACCELERATION.length; i++) {
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s2 = POINTER_ACCELERATION[i][0];
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a2 = POINTER_ACCELERATION[i][1];
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if (s2 <= speed) {
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continue;
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}
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if (i == 0) {
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return a2;
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}
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s1 = POINTER_ACCELERATION[i-1][0];
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a1 = POINTER_ACCELERATION[i-1][1];
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return ((speed-s1) / (s2-s1)) * (a2-a1) + a1;
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}
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if (POINTER_ACCELERATION.length > 0) {
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return POINTER_ACCELERATION[POINTER_ACCELERATION.length-1][1];
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}
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return 1;
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}
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function onDraggingTimeout() {
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draggingTimeout = null;
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ws.send("PointerButton 1 0");
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}
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function updateMoveAndScroll() {
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if (updateTimer == null) {
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onUpdateTimeout();
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if (UPDATE_INTERVAL > 0 && idleUpdates == 0) {
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updateTimer = setInterval(onUpdateTimeout, UPDATE_INTERVAL);
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}
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}
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}
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function onUpdateTimeout() {
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idleUpdates += 1;
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var moveX = Math.trunc(moveXSum);
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var moveY = Math.trunc(moveYSum);
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if (Math.abs(moveX) >= 1 || Math.abs(moveY) >= 1) {
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moveXSum -= moveX;
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moveYSum -= moveY;
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idleUpdates = 0;
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ws.send("PointerMove " + moveX + " " + moveY);
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}
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var scrollX = Math.trunc(scrollXSum);
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var scrollY = Math.trunc(scrollYSum);
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if (Math.abs(scrollX) >= 1 || Math.abs(scrollY) >= 1) {
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scrollXSum -= scrollX;
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scrollYSum -= scrollY;
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idleUpdates = 0;
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ws.send("PointerScroll " + scrollX + " " + scrollY);
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}
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if (idleUpdates >= MAX_IDLE_UPDATES) {
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clearInterval(updateTimer);
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updateTimer = null;
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}
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}
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function handleStart(evt) {
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if (ongoingTouches.length == 0) {
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touchStart = evt.timeStamp;
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touchMoved = false;
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touchReleasedCount = 0;
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dragging = false;
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}
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var touches = evt.changedTouches;
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for (var i = 0; i < touches.length; i++) {
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if (touches[i].target !== pad && touches[i].target !== padlabel) {
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continue;
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}
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evt.preventDefault();
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ongoingTouches.push(copyTouch(touches[i], evt.timeStamp));
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touchLastEnd = 0;
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if (!dragging) {
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moveXSum = Math.trunc(moveXSum);
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moveYSum = Math.trunc(moveYSum);
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}
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scrollXSum = Math.trunc(scrollXSum);
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scrollYSum = Math.trunc(scrollYSum);
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if (draggingTimeout !== null) {
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clearTimeout(draggingTimeout);
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draggingTimeout = null;
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dragging = true;
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}
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}
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}
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function handleEnd(evt) {
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var touches = evt.changedTouches;
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for (var i = 0; i < touches.length; i++) {
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var idx = ongoingTouchIndexById(touches[i].identifier);
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if (idx < 0) {
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continue;
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}
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ongoingTouches.splice(idx, 1);
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touchReleasedCount++;
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touchLastEnd = evt.timeStamp;
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}
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if (touchReleasedCount > TOUCH_MOVE_THRESHOLD.length) {
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touchMoved = true;
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}
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if (ongoingTouches.length == 0 && touchReleasedCount >= 1 &&
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dragging) {
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ws.send("PointerButton 1 0");
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}
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if (ongoingTouches.length == 0 && touchReleasedCount >= 1 &&
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!touchMoved && evt.timeStamp - touchStart < TOUCH_TIMEOUT) {
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var button = 0;
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if (touchReleasedCount == 1) {
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button = 1;
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} else if (touchReleasedCount == 2) {
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button = 3;
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}else if (touchReleasedCount == 3) {
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button = 2;
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}
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ws.send("PointerButton " + button + " 1");
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if (button == 1) {
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draggingTimeout = setTimeout(onDraggingTimeout, TOUCH_TIMEOUT);
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} else {
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ws.send("PointerButton " + button + " 0");
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}
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}
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}
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function handleCancel(evt) {
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var touches = evt.changedTouches;
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for (var i = 0; i < touches.length; i++) {
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var idx = ongoingTouchIndexById(touches[i].identifier);
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if (idx < 0) {
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continue;
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}
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ongoingTouches.splice(idx, 1);
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touchReleasedCount++;
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touchLastEnd = evt.timeStamp;
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touchMoved = true;
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}
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}
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function handleMove(evt) {
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var sumX = 0;
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var sumY = 0;
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var touches = evt.changedTouches;
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for (var i = 0; i < touches.length; i++) {
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var idx = ongoingTouchIndexById(touches[i].identifier);
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if (idx < 0) {
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continue;
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}
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var dist = Math.sqrt(Math.pow(touches[i].pageX - ongoingTouches[idx].pageXStart, 2) + Math.pow(touches[i].pageY - ongoingTouches[idx].pageYStart, 2));
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if (ongoingTouches.length > TOUCH_MOVE_THRESHOLD.length || dist > TOUCH_MOVE_THRESHOLD[ongoingTouches.length - 1]) {
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touchMoved = true;
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}
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var dx = touches[i].pageX - ongoingTouches[idx].pageX;
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var dy = touches[i].pageY - ongoingTouches[idx].pageY;
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var timeDelta = evt.timeStamp - ongoingTouches[idx].timeStamp;
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sumX += dx * calculatePointerAccelerationMult(Math.abs(dx) / timeDelta * 1000);
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sumY += dy * calculatePointerAccelerationMult(Math.abs(dy) / timeDelta * 1000);
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ongoingTouches[idx].pageX = touches[i].pageX;
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ongoingTouches[idx].pageY = touches[i].pageY;
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ongoingTouches[idx].timeStamp = evt.timeStamp;
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}
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if (touchMoved && evt.timeStamp - touchLastEnd >= TOUCH_TIMEOUT) {
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if (ongoingTouches.length == 1 || dragging) {
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moveXSum += sumX * MOVE_MULT;
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moveYSum += sumY * MOVE_MULT;
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} else if (ongoingTouches.length == 2) {
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scrollXSum -= sumX * SCROLL_MULT;
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scrollYSum -= sumY * SCROLL_MULT;
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}
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updateMoveAndScroll();
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}
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}
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function challengeResponse(message) {
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var shaObj = new jsSHA("SHA-256", "TEXT");
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shaObj.setHMACKey(message, "TEXT");
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shaObj.update(window.location.hash.substr(1));
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return btoa(shaObj.getHMAC("BYTES"));
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}
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window.addEventListener("load", function() {
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var authenticated = false;
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var opening = document.getElementById("opening");
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var closed = document.getElementById("closed");
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pad = document.getElementById("pad");
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padlabel = document.getElementById("padlabel");
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var keyboard = document.getElementById("keyboard");
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var fullscreenbutton = document.getElementById("fullscreenbutton");
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var text = document.getElementById("text");
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closed.style.display = "none";
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pad.style.display = "none";
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keyboard.style.display = "none";
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text.value = "";
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ws = new WebSocket("ws://" + location.hostname +
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(location.port ? ":" + location.port : "") +
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"/ws");
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ws.onmessage = function(event) {
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if (authenticated) {
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ws.close();
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return;
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}
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authenticated = true;
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ws.send(challengeResponse(event.data));
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opening.style.display = "none";
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if (history.state == "keyboard") {
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keyboard.style.display = "flex";
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text.focus();
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} else {
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pad.style.display = "flex";
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}
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};
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ws.onclose = function() {
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if (fullscreenElement()) {
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exitFullscreen();
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}
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opening.style.display = "none";
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pad.style.display = "none";
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keyboard.style.display = "none"
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closed.style.display = "flex";
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};
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document.getElementById("keyboardbutton").addEventListener("click",
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function(e) {
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if (fullscreenElement()) {
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exitFullscreen();
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}
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pad.style.display = "none";
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keyboard.style.display = "flex";
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text.focus();
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history.pushState("keyboard", "Remote Keyboard");
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});
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if (!fullscreenEnabled()) {
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fullscreenbutton.style.display = "none";
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}
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fullscreenbutton.addEventListener("click", function(e) {
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if (fullscreenElement()) {
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exitFullscreen();
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} else {
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requestFullscreen(pad);
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}
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});
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document.getElementById("sendbutton").addEventListener("click",
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function(e) {
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if (text.value != "") {
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ws.send("KeyboardText " + text.value);
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text.value = "";
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}
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window.history.back();
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});
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window.onpopstate = function(event) {
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if (keyboard.style.display == "flex") {
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pad.style.display = "flex";
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keyboard.style.display = "none";
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} else {
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window.history.back();
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}
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};
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pad.addEventListener("touchstart", handleStart, false);
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pad.addEventListener("touchend", handleEnd, false);
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pad.addEventListener("touchcancel", handleCancel, false);
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pad.addEventListener("touchmove", handleMove, false);
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}, false);
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