482 lines
15 KiB
JavaScript
482 lines
15 KiB
JavaScript
"use strict";
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/*
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* Copyright (c) 2018-2019 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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* Remote-Touchpad 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 Remote-Touchpad. If not, see <http://www.gnu.org/licenses/>.
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*/
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// [1 Touch, 2 Touches, 3 Touches] (as pixel)
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var TOUCH_MOVE_THRESHOLD = [10, 15, 15];
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// Max time between consecutive touches for clicking or dragging (as milliseconds)
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var TOUCH_TIMEOUT = 250;
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// [[pixel/second, multiplicator], ...]
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var POINTER_ACCELERATION = [
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[0, 0],
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[87, 1],
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[173, 1],
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[553, 2]
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];
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var POINTER_BUTTON_LEFT = 0;
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var POINTER_BUTTON_RIGHT = 1;
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var POINTER_BUTTON_MIDDLE = 2;
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var KEY_VOLUME_MUTE = 0;
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var KEY_VOLUME_DOWN = 1;
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var KEY_VOLUME_UP = 2;
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var KEY_MEDIA_PLAY_PAUSE = 3;
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var KEY_MEDIA_PREV_TRACK = 4;
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var KEY_MEDIA_NEXT_TRACK = 5;
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var KEY_BROWSER_BACK = 6;
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var KEY_BROWSER_FORWARD = 7;
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var KEY_SUPER = 8;
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var KEY_LEFT = 9;
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var KEY_RIGHT = 10;
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var KEY_UP = 11;
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var KEY_DOWN = 12;
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var KEY_HOME = 13;
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var KEY_END = 14;
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var KEY_BACK_SPACE = 15;
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var KEY_DELETE = 16;
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var KEY_RETURN = 17;
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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 scrolling = false;
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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(element, options) {
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if (element.requestFullscreen) {
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element.requestFullscreen(options);
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} else if (element.webkitRequestFullscreen) {
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element.webkitRequestFullscreen(options);
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} else if (element.mozRequestFullScreen) {
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element.mozRequestFullScreen(options);
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} else if (element.msRequestFullscreen) {
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element.msRequestFullscreen(options);
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}
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}
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function exitFullscreen() {
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if (fullscreenElement()) {
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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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}
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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 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 += 1) {
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if (ongoingTouches[i].identifier == 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 += 1) {
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var s2 = POINTER_ACCELERATION[i][0];
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var 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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var s1 = POINTER_ACCELERATION[i - 1][0];
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var 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("b" + POINTER_BUTTON_LEFT + ";0");
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}
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function updateMoveAndScroll() {
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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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ws.send("m" + 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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scrolling = true;
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ws.send("s" + scrollX + ";" + scrollY);
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}
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}
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function handleStart(evt) {
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// Might get called multiple times for the same touches
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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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}
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var touches = evt.changedTouches;
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for (var i = 0; i < touches.length; i += 1) {
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if (touches[i].target != pad && touches[i].target != padlabel &&
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ongoingTouches.length == 0) {
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continue;
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}
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evt.preventDefault();
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var touch = copyTouch(touches[i], evt.timeStamp);
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var idx = ongoingTouchIndexById(touch.identifier);
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if (idx < 0) {
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ongoingTouches.push(touch);
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} else {
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ongoingTouches[idx] = touch;
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}
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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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if (scrolling) {
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ws.send("sf");
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scrolling = false;
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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 += 1) {
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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 += 1;
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touchLastEnd = evt.timeStamp;
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if (scrolling) {
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ws.send("sf");
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scrolling = false;
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}
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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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if (dragging) {
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dragging = false;
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ws.send("b" + POINTER_BUTTON_LEFT + ";0");
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}
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if (!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 = POINTER_BUTTON_LEFT;
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} else if (touchReleasedCount == 2) {
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button = POINTER_BUTTON_RIGHT;
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} else if (touchReleasedCount == 3) {
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button = POINTER_BUTTON_MIDDLE;
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}
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ws.send("b" + button + ";1");
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if (button == POINTER_BUTTON_LEFT) {
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draggingTimeout = setTimeout(onDraggingTimeout, TOUCH_TIMEOUT);
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} else {
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ws.send("b" + button + ";0");
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}
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}
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touchReleasedCount = 0;
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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 += 1) {
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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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if (!touchMoved) {
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var dist = Math.sqrt(Math.pow(touches[i].pageX - ongoingTouches[idx].pageXStart, 2) +
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Math.pow(touches[i].pageY - ongoingTouches[idx].pageYStart, 2));
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if (ongoingTouches.length > TOUCH_MOVE_THRESHOLD.length ||
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dist > TOUCH_MOVE_THRESHOLD[ongoingTouches.length - 1] ||
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evt.timeStamp - touchStart >= TOUCH_TIMEOUT) {
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touchMoved = true;
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}
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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;
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moveYSum += sumY;
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} else if (ongoingTouches.length == 2) {
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scrollXSum -= sumX;
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scrollYSum -= sumY;
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}
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updateMoveAndScroll();
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}
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}
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function handleKeydown(evt) {
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var key = {
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"OS": KEY_SUPER,
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"Super": KEY_SUPER,
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"Meta": KEY_SUPER,
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"Backspace": KEY_BACK_SPACE,
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"Enter": KEY_RETURN,
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"Delete": KEY_DELETE,
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"Home": KEY_HOME,
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"End": KEY_END,
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"Left": KEY_LEFT,
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"ArrowLeft": KEY_LEFT,
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"Right": KEY_RIGHT,
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"ArrowRight": KEY_RIGHT,
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"Up": KEY_UP,
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"ArrowUp": KEY_UP,
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"Down": KEY_DOWN,
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"ArrowDown": KEY_DOWN,
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}[evt.key];
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if (key != undefined) {
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evt.preventDefault();
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ws.send("k" + key);
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} else if (evt.key.length == 1) {
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evt.preventDefault();
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ws.send("t" + evt.key);
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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 keys = document.getElementById("keys");
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var keys_pages = keys.querySelectorAll(".page");
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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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function showScene(scene) {
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[opening, closed, pad, keys, keyboard].forEach(function(element) {
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element.classList.toggle("hidden", element != scene);
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});
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}
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function showKeys(page_index) {
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if (page_index < 0 || keys_pages.length <= page_index) {
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page_index = 0;
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}
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exitFullscreen();
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showScene(keys);
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for (var i = 0; i < keys_pages.length; i += 1) {
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keys_pages[i].classList.toggle("hidden", i != page_index);
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}
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if ((history.state || "").split(":")[0] == "keys") {
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history.replaceState("keys:" + page_index, "");
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} else {
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history.pushState("keys:" + page_index, "");
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}
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}
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function showKeyboard() {
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exitFullscreen();
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showScene(keyboard);
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text.focus();
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if (history.state != "keyboard") {
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history.pushState("keyboard", "");
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}
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}
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text.value = "";
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showScene(opening);
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var wsURL = new URL("ws", location.href);
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wsURL.protocol = wsURL.protocol == "http:" ? "ws:" : "wss:";
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ws = new WebSocket(wsURL);
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ws.onmessage = function(evt) {
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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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ws.send(challengeResponse(evt.data));
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authenticated = true;
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window.onpopstate();
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};
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ws.onclose = function() {
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authenticated = false;
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exitFullscreen();
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showScene(closed);
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};
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document.getElementById("keysbutton").addEventListener("click", function() {
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showKeys(0);
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});
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document.getElementById("keyboardbutton").addEventListener("click", function() {
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showKeyboard();
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});
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if (!fullscreenEnabled()) {
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fullscreenbutton.classList.add("hidden");
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}
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fullscreenbutton.addEventListener("click", function() {
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if (fullscreenElement()) {
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exitFullscreen();
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} else {
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requestFullscreen(document.documentElement, {navigationUI: "hide"});
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}
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});
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document.getElementById("switchbutton").addEventListener("click", function() {
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var page_index = 0;
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for (var i = 0; i < keys_pages.length; i += 1) {
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if (!keys_pages[i].classList.contains("hidden")) {
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page_index = i;
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}
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}
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showKeys(page_index + 1);
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});
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[
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{id: "browserbackbutton", key: KEY_BROWSER_BACK},
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{id: "superbutton", key: KEY_SUPER},
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{id: "browserforwardbutton", key: KEY_BROWSER_FORWARD},
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{id: "prevtrackbutton", key: KEY_MEDIA_PREV_TRACK},
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{id: "playpausebutton", key: KEY_MEDIA_PLAY_PAUSE},
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{id: "nexttrackbutton", key: KEY_MEDIA_NEXT_TRACK},
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{id: "volumedownbutton", key: KEY_VOLUME_DOWN},
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{id: "volumemutebutton", key: KEY_VOLUME_MUTE},
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{id: "volumeupbutton", key: KEY_VOLUME_UP},
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{id: "backspacebutton", key: KEY_BACK_SPACE},
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{id: "returnbutton", key: KEY_RETURN},
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{id: "deletebutton", key: KEY_DELETE},
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{id: "homebutton", key: KEY_HOME},
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{id: "endbutton", key: KEY_END},
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{id: "leftbutton", key: KEY_LEFT},
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{id: "rightbutton", key: KEY_RIGHT},
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{id: "upbutton", key: KEY_UP},
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{id: "downbutton", key: KEY_DOWN},
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].forEach(function(o) {
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document.getElementById(o.id).addEventListener("click", function() {
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ws.send("k" + o.key);
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});
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});
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document.getElementById("textkeysbutton").addEventListener("click", function() {
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showKeys(1);
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});
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document.getElementById("sendbutton").addEventListener("click", function() {
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if (text.value != "") {
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ws.send("t" + 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() {
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if (authenticated) {
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if ((history.state || "").split(":")[0] == "keys") {
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showKeys(parseInt(history.state.split(":")[1]) || 0);
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} else if (history.state == "keyboard") {
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showKeyboard();
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} else {
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showScene(pad);
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}
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}
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};
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document.getElementById("reloadbutton").addEventListener("click", function() {
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location.reload();
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});
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pad.addEventListener("touchstart", handleStart);
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pad.addEventListener("touchend", handleEnd);
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pad.addEventListener("touchcancel", handleEnd);
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pad.addEventListener("touchmove", handleMove);
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window.addEventListener("keydown", function(evt) {
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if (!pad.classList.contains("hidden")) {
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handleKeydown(evt);
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}
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});
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});
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