app/ui.js

   1 /*
   2  * noVNC: HTML5 VNC client
   3  * Copyright (C) 2012 Joel Martin
   4  * Copyright (C) 2016 Samuel Mannehed for Cendio AB
   5  * Copyright (C) 2016 Pierre Ossman for Cendio AB
   6  * Licensed under MPL 2.0 (see LICENSE.txt)
   7  *
   8  * See README.md for usage and integration instructions.
   9  */
  10
  11 /* jslint white: false, browser: true */
  12 /* global window, document.getElementById, Util, WebUtil, RFB, Display */
  13
  14 /* [module]
  15  * import Util from "../core/util";
  16  * import KeyTable from "../core/input/keysym";
  17  * import RFB from "../core/rfb";
  18  * import Display from "../core/display";
  19  * import WebUtil from "./webutil";
  20  */
  21
  22 var UI;
  23
  24 (function () {
  25     "use strict";
  26
  27     /* [begin skip-as-module] */
  28     // Load supporting scripts
  29     WebUtil.load_scripts(
  30         {'core': ["base64.js", "websock.js", "des.js", "input/keysymdef.js",
  31                   "input/xtscancodes.js", "input/util.js", "input/devices.js",
  32                   "display.js", "inflator.js", "rfb.js", "input/keysym.js"]});
  33
  34     window.onscriptsload = function () { UI.load(); };
  35     /* [end skip-as-module] */
  36
  37     UI = {
  38
  39         connected: false,
  40         desktopName: "",
  41
  42         resizeTimeout: null,
  43         statusTimeout: null,
  44         hideKeyboardTimeout: null,
  45         idleControlbarTimeout: null,
  46         closeControlbarTimeout: null,
  47
  48         controlbarGrabbed: false,
  49         controlbarDrag: false,
  50         controlbarMouseDownClientY: 0,
  51         controlbarMouseDownOffsetY: 0,
  52         keyboardVisible: false,
  53
  54         isTouchDevice: false,
  55         isSafari: false,
  56         rememberedClipSetting: null,
  57         lastKeyboardinput: null,
  58         defaultKeyboardinputLen: 100,
  59
  60         // Setup rfb object, load settings from browser storage, then call
  61         // UI.init to setup the UI/menus
  62         load: function(callback) {
  63             WebUtil.initSettings(UI.start, callback);
  64         },
  65
  66         // Render default UI and initialize settings menu
  67         start: function(callback) {
  68
  69             // Setup global variables first
  70             UI.isTouchDevice = 'ontouchstart' in document.documentElement;
  71             UI.isSafari = (navigator.userAgent.indexOf('Safari') !== -1 &&
  72                            navigator.userAgent.indexOf('Chrome') === -1);
  73
  74             UI.initSettings();
  75
  76             // Adapt the interface for touch screen devices
  77             if (UI.isTouchDevice) {
  78                 document.documentElement.classList.add("noVNC_touch");
  79                 // Remove the address bar
  80                 setTimeout(function() { window.scrollTo(0, 1); }, 100);
  81                 UI.forceSetting('clip', true);
  82             } else {
  83                 UI.initSetting('clip', false);
  84             }
  85
  86             // Setup and initialize event handlers
  87             UI.setupWindowEvents();
  88             UI.setupFullscreen();
  89             UI.addControlbarHandlers();
  90             UI.addTouchSpecificHandlers();
  91             UI.addExtraKeysHandlers();
  92             UI.addXvpHandlers();
  93             UI.addConnectionControlHandlers();
  94             UI.addClipboardHandlers();
  95             UI.addSettingsHandlers();
  96
  97             // Show the connect panel on first load unless autoconnecting
  98             if (!autoconnect) {
  99                 UI.openConnectPanel();
 100             }
 101
 102             UI.updateViewClip();
 103
 104             UI.updateVisualState();
 105
 106             document.getElementById('noVNC_setting_host').focus();
 107
 108             var autoconnect = WebUtil.getConfigVar('autoconnect', false);
 109             if (autoconnect === 'true' || autoconnect == '1') {
 110                 autoconnect = true;
 111                 UI.connect();
 112             } else {
 113                 autoconnect = false;
 114             }
 115
 116             if (typeof callback === "function") {
 117                 callback(UI.rfb);
 118             }
 119         },
 120
 121         initSettings: function() {
 122             // Stylesheet selection dropdown
 123             var sheet = WebUtil.selectStylesheet();
 124             var sheets = WebUtil.getStylesheets();
 125             var i;
 126             for (i = 0; i < sheets.length; i += 1) {
 127                 UI.addOption(document.getElementById('noVNC_setting_stylesheet'),sheets[i].title, sheets[i].title);
 128             }
 129
 130             // Logging selection dropdown
 131             var llevels = ['error', 'warn', 'info', 'debug'];
 132             for (i = 0; i < llevels.length; i += 1) {
 133                 UI.addOption(document.getElementById('noVNC_setting_logging'),llevels[i], llevels[i]);
 134             }
 135
 136             // Settings with immediate effects
 137             UI.initSetting('logging', 'warn');
 138             WebUtil.init_logging(UI.getSetting('logging'));
 139
 140             UI.initSetting('stylesheet', 'default');
 141             WebUtil.selectStylesheet(null);
 142             // call twice to get around webkit bug
 143             WebUtil.selectStylesheet(UI.getSetting('stylesheet'));
 144
 145             // if port == 80 (or 443) then it won't be present and should be
 146             // set manually
 147             var port = window.location.port;
 148             if (!port) {
 149                 if (window.location.protocol.substring(0,5) == 'https') {
 150                     port = 443;
 151                 }
 152                 else if (window.location.protocol.substring(0,4) == 'http') {
 153                     port = 80;
 154                 }
 155             }
 156
 157             /* Populate the controls if defaults are provided in the URL */
 158             UI.initSetting('host', window.location.hostname);
 159             UI.initSetting('port', port);
 160             UI.initSetting('password', '');
 161             UI.initSetting('encrypt', (window.location.protocol === "https:"));
 162             UI.initSetting('true_color', true);
 163             UI.initSetting('cursor', !UI.isTouchDevice);
 164             UI.initSetting('resize', 'off');
 165             UI.initSetting('shared', true);
 166             UI.initSetting('view_only', false);
 167             UI.initSetting('path', 'websockify');
 168             UI.initSetting('repeaterID', '');
 169             UI.initSetting('token', '');
 170         },
 171
 172         setupWindowEvents: function() {
 173             window.addEventListener( 'resize', function () {
 174                 UI.applyResizeMode();
 175                 UI.updateViewClip();
 176                 UI.updateViewDrag();
 177             } );
 178
 179             document.getElementById("noVNC_status")
 180                 .addEventListener('click', UI.hideStatus);
 181         },
 182
 183         setupFullscreen: function() {
 184             // Only show the button if fullscreen is properly supported
 185             // * Safari doesn't support alphanumerical input while in fullscreen
 186             if (!UI.isSafari &&
 187                 (document.documentElement.requestFullscreen ||
 188                  document.documentElement.mozRequestFullScreen ||
 189                  document.documentElement.webkitRequestFullscreen ||
 190                  document.body.msRequestFullscreen)) {
 191                 document.getElementById('noVNC_fullscreen_button')
 192                     .classList.remove("noVNC_hidden");
 193                 UI.addFullscreenHandlers();
 194             }
 195         },
 196
 197         addControlbarHandlers: function() {
 198             document.getElementById("noVNC_control_bar")
 199                 .addEventListener('mousemove', UI.activateControlbar);
 200             document.getElementById("noVNC_control_bar")
 201                 .addEventListener('mouseup', UI.activateControlbar);
 202             document.getElementById("noVNC_control_bar")
 203                 .addEventListener('mousedown', UI.activateControlbar);
 204             document.getElementById("noVNC_control_bar")
 205                 .addEventListener('keypress', UI.activateControlbar);
 206
 207             document.getElementById("noVNC_control_bar")
 208                 .addEventListener('mousedown', UI.keepControlbar);
 209             document.getElementById("noVNC_control_bar")
 210                 .addEventListener('keypress', UI.keepControlbar);
 211
 212             document.getElementById("noVNC_view_drag_button")
 213                 .addEventListener('click', UI.toggleViewDrag);
 214
 215             document.getElementById("noVNC_control_bar_handle")
 216                 .addEventListener('mousedown', UI.controlbarHandleMouseDown);
 217             document.getElementById("noVNC_control_bar_handle")
 218                 .addEventListener('mouseup', UI.controlbarHandleMouseUp);
 219             document.getElementById("noVNC_control_bar_handle")
 220                 .addEventListener('mousemove', UI.dragControlbarHandle);
 221             // resize events aren't available for elements
 222             window.addEventListener('resize', UI.updateControlbarHandle);
 223         },
 224
 225         addTouchSpecificHandlers: function() {
 226             document.getElementById("noVNC_mouse_button0")
 227                 .addEventListener('click', function () { UI.setMouseButton(1); });
 228             document.getElementById("noVNC_mouse_button1")
 229                 .addEventListener('click', function () { UI.setMouseButton(2); });
 230             document.getElementById("noVNC_mouse_button2")
 231                 .addEventListener('click', function () { UI.setMouseButton(4); });
 232             document.getElementById("noVNC_mouse_button4")
 233                 .addEventListener('click', function () { UI.setMouseButton(0); });
 234             document.getElementById("noVNC_keyboard_button")
 235                 .addEventListener('click', UI.toggleVirtualKeyboard);
 236
 237             document.getElementById("noVNC_keyboardinput")
 238                 .addEventListener('input', UI.keyInput);
 239             document.getElementById("noVNC_keyboardinput")
 240                 .addEventListener('blur', UI.onblurVirtualKeyboard);
 241             document.getElementById("noVNC_keyboardinput")
 242                 .addEventListener('submit', function () { return false; });
 243
 244             document.getElementById("noVNC_control_bar")
 245                 .addEventListener('touchstart', UI.activateControlbar);
 246             document.getElementById("noVNC_control_bar")
 247                 .addEventListener('touchmove', UI.activateControlbar);
 248             document.getElementById("noVNC_control_bar")
 249                 .addEventListener('touchend', UI.activateControlbar);
 250             document.getElementById("noVNC_control_bar")
 251                 .addEventListener('input', UI.activateControlbar);
 252
 253             document.getElementById("noVNC_control_bar")
 254                 .addEventListener('touchstart', UI.keepControlbar);
 255             document.getElementById("noVNC_control_bar")
 256                 .addEventListener('input', UI.keepControlbar);
 257
 258             document.getElementById("noVNC_control_bar_handle")
 259                 .addEventListener('touchstart', UI.controlbarHandleMouseDown);
 260             document.getElementById("noVNC_control_bar_handle")
 261                 .addEventListener('touchend', UI.controlbarHandleMouseUp);
 262             document.getElementById("noVNC_control_bar_handle")
 263                 .addEventListener('touchmove', UI.dragControlbarHandle);
 264
 265             window.addEventListener('load', UI.keyboardinputReset);
 266         },
 267
 268         addExtraKeysHandlers: function() {
 269             document.getElementById("noVNC_toggle_extra_keys_button")
 270                 .addEventListener('click', UI.toggleExtraKeys);
 271             document.getElementById("noVNC_toggle_ctrl_button")
 272                 .addEventListener('click', UI.toggleCtrl);
 273             document.getElementById("noVNC_toggle_alt_button")
 274                 .addEventListener('click', UI.toggleAlt);
 275             document.getElementById("noVNC_send_tab_button")
 276                 .addEventListener('click', UI.sendTab);
 277             document.getElementById("noVNC_send_esc_button")
 278                 .addEventListener('click', UI.sendEsc);
 279             document.getElementById("noVNC_send_ctrl_alt_del_button")
 280                 .addEventListener('click', UI.sendCtrlAltDel);
 281         },
 282
 283         addXvpHandlers: function() {
 284             document.getElementById("noVNC_xvp_shutdown_button")
 285                 .addEventListener('click', function() { UI.rfb.xvpShutdown(); });
 286             document.getElementById("noVNC_xvp_reboot_button")
 287                 .addEventListener('click', function() { UI.rfb.xvpReboot(); });
 288             document.getElementById("noVNC_xvp_reset_button")
 289                 .addEventListener('click', function() { UI.rfb.xvpReset(); });
 290             document.getElementById("noVNC_xvp_button")
 291                 .addEventListener('click', UI.toggleXvpPanel);
 292         },
 293
 294         addConnectionControlHandlers: function() {
 295             document.getElementById("noVNC_connect_controls_button")
 296                 .addEventListener('click', UI.toggleConnectPanel);
 297             document.getElementById("noVNC_disconnect_button")
 298                 .addEventListener('click', UI.disconnect);
 299             document.getElementById("noVNC_connect_button")
 300                 .addEventListener('click', UI.connect);
 301
 302             document.getElementById("noVNC_password_button")
 303                 .addEventListener('click', UI.setPassword);
 304         },
 305
 306         addClipboardHandlers: function() {
 307             document.getElementById("noVNC_clipboard_button")
 308                 .addEventListener('click', UI.toggleClipboardPanel);
 309             document.getElementById("noVNC_clipboard_text")
 310                 .addEventListener('focus', UI.displayBlur);
 311             document.getElementById("noVNC_clipboard_text")
 312                 .addEventListener('blur', UI.displayFocus);
 313             document.getElementById("noVNC_clipboard_text")
 314                 .addEventListener('change', UI.clipboardSend);
 315             document.getElementById("noVNC_clipboard_clear_button")
 316                 .addEventListener('click', UI.clipboardClear);
 317         },
 318
 319         addSettingsHandlers: function() {
 320             document.getElementById("noVNC_settings_button")
 321                 .addEventListener('click', UI.toggleSettingsPanel);
 322             document.getElementById("noVNC_settings_apply")
 323                 .addEventListener('click', UI.settingsApply);
 324
 325             document.getElementById("noVNC_setting_resize")
 326                 .addEventListener('change', UI.enableDisableViewClip);
 327         },
 328
 329         addFullscreenHandlers: function() {
 330             document.getElementById("noVNC_fullscreen_button")
 331                 .addEventListener('click', UI.toggleFullscreen);
 332
 333             window.addEventListener('fullscreenchange', UI.updateFullscreenButton);
 334             window.addEventListener('mozfullscreenchange', UI.updateFullscreenButton);
 335             window.addEventListener('webkitfullscreenchange', UI.updateFullscreenButton);
 336             window.addEventListener('msfullscreenchange', UI.updateFullscreenButton);
 337         },
 338
 339         initRFB: function() {
 340             try {
 341                 UI.rfb = new RFB({'target': document.getElementById('noVNC_canvas'),
 342                                   'onNotification': UI.notification,
 343                                   'onUpdateState': UI.updateState,
 344                                   'onDisconnected': UI.disconnectFinished,
 345                                   'onPasswordRequired': UI.passwordRequired,
 346                                   'onXvpInit': UI.updateXvpButton,
 347                                   'onClipboard': UI.clipboardReceive,
 348                                   'onFBUComplete': UI.initialResize,
 349                                   'onFBResize': UI.updateViewDrag,
 350                                   'onDesktopName': UI.updateDesktopName});
 351                 return true;
 352             } catch (exc) {
 353                 UI.showStatus('Unable to create RFB client -- ' + exc, 'error');
 354                 return false;
 355             }
 356         },
 357
 358 /* ------^-------
 359  *     /INIT
 360  * ==============
 361  *     VISUAL
 362  * ------v------*/
 363
 364         updateState: function(rfb, state, oldstate) {
 365             switch (state) {
 366                 case 'connecting':
 367                     UI.showStatus("Connecting");
 368                     break;
 369                 case 'connected':
 370                     UI.connected = true;
 371                     if (rfb && rfb.get_encrypt()) {
 372                         UI.showStatus("Connected (encrypted) to " +
 373                                       UI.desktopName);
 374                     } else {
 375                         UI.showStatus("Connected (unencrypted) to " +
 376                                       UI.desktopName);
 377                     }
 378                     break;
 379                 case 'disconnecting':
 380                     UI.showStatus("Disconnecting");
 381                     break;
 382                 case 'disconnected':
 383                     UI.connected = false;
 384                     UI.showStatus("Disconnected");
 385                     break;
 386                 default:
 387                     UI.showStatus("Invalid state", 'error');
 388                     break;
 389             }
 390
 391             UI.updateVisualState();
 392         },
 393
 394         // Disable/enable controls depending on connection state
 395         updateVisualState: function() {
 396             //Util.Debug(">> updateVisualState");
 397             document.getElementById('noVNC_setting_encrypt').disabled = UI.connected;
 398             document.getElementById('noVNC_setting_true_color').disabled = UI.connected;
 399             if (Util.browserSupportsCursorURIs()) {
 400                 document.getElementById('noVNC_setting_cursor').disabled = UI.connected;
 401             } else {
 402                 UI.updateSetting('cursor', !UI.isTouchDevice);
 403                 document.getElementById('noVNC_setting_cursor').disabled = true;
 404             }
 405
 406             UI.enableDisableViewClip();
 407             document.getElementById('noVNC_setting_resize').disabled = UI.connected;
 408             document.getElementById('noVNC_setting_shared').disabled = UI.connected;
 409             document.getElementById('noVNC_setting_view_only').disabled = UI.connected;
 410             document.getElementById('noVNC_setting_path').disabled = UI.connected;
 411             document.getElementById('noVNC_setting_repeaterID').disabled = UI.connected;
 412
 413             if (UI.connected) {
 414                 document.documentElement.classList.add("noVNC_connected");
 415                 UI.updateViewClip();
 416                 UI.setMouseButton(1);
 417
 418                 // Hide the controlbar after 2 seconds
 419                 UI.closeControlbarTimeout = setTimeout(UI.closeControlbar, 2000);
 420             } else {
 421                 document.documentElement.classList.remove("noVNC_connected");
 422                 UI.updateXvpButton(0);
 423                 UI.keepControlbar();
 424             }
 425
 426             // State change disables viewport dragging.
 427             // It is enabled (toggled) by direct click on the button
 428             UI.setViewDrag(false);
 429
 430             // State change also closes the password dialog
 431             document.getElementById('noVNC_password_dlg')
 432                 .classList.remove('noVNC_open');
 433
 434             //Util.Debug("<< updateVisualState");
 435         },
 436
 437         showStatus: function(text, status_type, time) {
 438             var statusElem = document.getElementById('noVNC_status');
 439
 440             clearTimeout(UI.statusTimeout);
 441
 442             if (typeof status_type === 'undefined') {
 443                 status_type = 'normal';
 444             }
 445
 446             statusElem.classList.remove("noVNC_status_normal",
 447                                         "noVNC_status_warn",
 448                                         "noVNC_status_error");
 449
 450             switch (status_type) {
 451                 case 'warning':
 452                 case 'warn':
 453                     statusElem.classList.add("noVNC_status_warn");
 454                     break;
 455                 case 'error':
 456                     statusElem.classList.add("noVNC_status_error");
 457                     break;
 458                 case 'normal':
 459                 case 'info':
 460                 default:
 461                     statusElem.classList.add("noVNC_status_normal");
 462                     break;
 463             }
 464
 465             statusElem.innerHTML = text;
 466             statusElem.classList.add("noVNC_open");
 467
 468             // If no time was specified, show the status for 1.5 seconds
 469             if (typeof time === 'undefined') {
 470                 time = 1500;
 471             }
 472
 473             // Error messages do not timeout
 474             if (status_type !== 'error') {
 475                 UI.statusTimeout = window.setTimeout(UI.hideStatus, time);
 476             }
 477         },
 478
 479         hideStatus: function() {
 480             clearTimeout(UI.statusTimeout);
 481             document.getElementById('noVNC_status').classList.remove("noVNC_open");
 482         },
 483
 484         notification: function (rfb, msg, level, options) {
 485             UI.showStatus(msg, level);
 486         },
 487
 488         activateControlbar: function(event) {
 489             clearTimeout(UI.idleControlbarTimeout);
 490             // We manipulate the anchor instead of the actual control
 491             // bar in order to avoid creating new a stacking group
 492             document.getElementById('noVNC_control_bar_anchor')
 493                 .classList.remove("noVNC_idle");
 494             UI.idleControlbarTimeout = window.setTimeout(UI.idleControlbar, 2000);
 495         },
 496
 497         idleControlbar: function() {
 498             document.getElementById('noVNC_control_bar_anchor')
 499                 .classList.add("noVNC_idle");
 500         },
 501
 502         keepControlbar: function() {
 503             clearTimeout(UI.closeControlbarTimeout);
 504         },
 505
 506         openControlbar: function() {
 507             document.getElementById('noVNC_control_bar')
 508                 .classList.add("noVNC_open");
 509         },
 510
 511         closeControlbar: function() {
 512             UI.closeAllPanels();
 513             document.getElementById('noVNC_control_bar')
 514                 .classList.remove("noVNC_open");
 515         },
 516
 517         toggleControlbar: function() {
 518             if (document.getElementById('noVNC_control_bar')
 519                 .classList.contains("noVNC_open")) {
 520                 UI.closeControlbar();
 521             } else {
 522                 UI.openControlbar();
 523             }
 524         },
 525
 526         dragControlbarHandle: function (e) {
 527             if (!UI.controlbarGrabbed) return;
 528
 529             var ptr = Util.getPointerEvent(e);
 530
 531             if (!UI.controlbarDrag) {
 532                 // The goal is to trigger on a certain physical width, the
 533                 // devicePixelRatio brings us a bit closer but is not optimal.
 534                 var dragThreshold = 10 * (window.devicePixelRatio || 1);
 535                 var dragDistance = Math.abs(ptr.clientY - UI.controlbarMouseDownClientY);
 536
 537                 if (dragDistance < dragThreshold) return;
 538
 539                 UI.controlbarDrag = true;
 540             }
 541
 542             var eventY = ptr.clientY - UI.controlbarMouseDownOffsetY;
 543
 544             UI.moveControlbarHandle(eventY);
 545
 546             e.preventDefault();
 547             e.stopPropagation();
 548         },
 549
 550         // Move the handle but don't allow any position outside the bounds
 551         moveControlbarHandle: function (posY) {
 552             var handle = document.getElementById("noVNC_control_bar_handle");
 553             var handleHeight = Util.getPosition(handle).height;
 554             var controlbar = document.getElementById("noVNC_control_bar");
 555             var controlbarBounds = Util.getPosition(controlbar);
 556             var controlbarTop = controlbarBounds.y;
 557             var controlbarBottom = controlbarBounds.y + controlbarBounds.height;
 558             var margin = 10;
 559
 560             var viewportY = posY;
 561
 562             // Refuse coordinates outside the control bar
 563             if (viewportY < controlbarTop + margin) {
 564                 viewportY = controlbarTop + margin;
 565             } else if (viewportY > controlbarBottom - handleHeight - margin) {
 566                 viewportY = controlbarBottom - handleHeight - margin;
 567             }
 568
 569             // Corner case: control bar too small for stable position
 570             if (controlbarBounds.height < (handleHeight + margin * 2)) {
 571                 viewportY = controlbarTop + (controlbarBounds.height - handleHeight) / 2;
 572             }
 573
 574             var relativeY = viewportY - controlbarTop;
 575             handle.style.transform = "translateY(" + relativeY + "px)";
 576         },
 577
 578         updateControlbarHandle: function () {
 579             var handle = document.getElementById("noVNC_control_bar_handle");
 580             var pos = Util.getPosition(handle);
 581             UI.moveControlbarHandle(pos.y);
 582         },
 583
 584         controlbarHandleMouseUp: function(e) {
 585             if ((e.type == "mouseup") && (e.button != 0)) return;
 586
 587             // mouseup and mousedown on the same place toggles the controlbar
 588             if (UI.controlbarGrabbed && !UI.controlbarDrag) {
 589                 UI.toggleControlbar();
 590                 e.preventDefault();
 591                 e.stopPropagation();
 592             }
 593             UI.controlbarGrabbed = false;
 594         },
 595
 596         controlbarHandleMouseDown: function(e) {
 597             if ((e.type == "mousedown") && (e.button != 0)) return;
 598
 599             var ptr = Util.getPointerEvent(e);
 600
 601             var handle = document.getElementById("noVNC_control_bar_handle");
 602             var bounds = handle.getBoundingClientRect();
 603
 604             WebUtil.setCapture(handle);
 605             UI.controlbarGrabbed = true;
 606             UI.controlbarDrag = false;
 607
 608             UI.controlbarMouseDownClientY = ptr.clientY;
 609             UI.controlbarMouseDownOffsetY = ptr.clientY - bounds.top;
 610             e.preventDefault();
 611             e.stopPropagation();
 612         },
 613
 614 /* ------^-------
 615  *    /VISUAL
 616  * ==============
 617  *    SETTINGS
 618  * ------v------*/
 619
 620         // Initial page load read/initialization of settings
 621         initSetting: function(name, defVal) {
 622             // Check Query string followed by cookie
 623             var val = WebUtil.getConfigVar(name);
 624             if (val === null) {
 625                 val = WebUtil.readSetting(name, defVal);
 626             }
 627             UI.updateSetting(name, val);
 628             return val;
 629         },
 630
 631         // Update cookie and form control setting. If value is not set, then
 632         // updates from control to current cookie setting.
 633         updateSetting: function(name, value) {
 634
 635             // Save the cookie for this session
 636             if (typeof value !== 'undefined') {
 637                 WebUtil.writeSetting(name, value);
 638             }
 639
 640             // Update the settings control
 641             value = UI.getSetting(name);
 642
 643             var ctrl = document.getElementById('noVNC_setting_' + name);
 644             if (ctrl.type === 'checkbox') {
 645                 ctrl.checked = value;
 646
 647             } else if (typeof ctrl.options !== 'undefined') {
 648                 for (var i = 0; i < ctrl.options.length; i += 1) {
 649                     if (ctrl.options[i].value === value) {
 650                         ctrl.selectedIndex = i;
 651                         break;
 652                     }
 653                 }
 654             } else {
 655                 /*Weird IE9 error leads to 'null' appearring
 656                 in textboxes instead of ''.*/
 657                 if (value === null) {
 658                     value = "";
 659                 }
 660                 ctrl.value = value;
 661             }
 662         },
 663
 664         // Save control setting to cookie
 665         saveSetting: function(name) {
 666             var val, ctrl = document.getElementById('noVNC_setting_' + name);
 667             if (ctrl.type === 'checkbox') {
 668                 val = ctrl.checked;
 669             } else if (typeof ctrl.options !== 'undefined') {
 670                 val = ctrl.options[ctrl.selectedIndex].value;
 671             } else {
 672                 val = ctrl.value;
 673             }
 674             WebUtil.writeSetting(name, val);
 675             //Util.Debug("Setting saved '" + name + "=" + val + "'");
 676             return val;
 677         },
 678
 679         // Force a setting to be a certain value
 680         forceSetting: function(name, val) {
 681             UI.updateSetting(name, val);
 682             return val;
 683         },
 684
 685         // Read form control compatible setting from cookie
 686         getSetting: function(name) {
 687             var ctrl = document.getElementById('noVNC_setting_' + name);
 688             var val = WebUtil.readSetting(name);
 689             if (typeof val !== 'undefined' && val !== null && ctrl.type === 'checkbox') {
 690                 if (val.toString().toLowerCase() in {'0':1, 'no':1, 'false':1}) {
 691                     val = false;
 692                 } else {
 693                     val = true;
 694                 }
 695             }
 696             return val;
 697         },
 698
 699         // Save/apply settings when 'Apply' button is pressed
 700         settingsApply: function() {
 701             //Util.Debug(">> settingsApply");
 702             UI.saveSetting('encrypt');
 703             UI.saveSetting('true_color');
 704             if (Util.browserSupportsCursorURIs()) {
 705                 UI.saveSetting('cursor');
 706             }
 707
 708             UI.saveSetting('resize');
 709
 710             if (UI.getSetting('resize') === 'downscale' || UI.getSetting('resize') === 'scale') {
 711                 UI.forceSetting('clip', false);
 712             }
 713
 714             UI.saveSetting('clip');
 715             UI.saveSetting('shared');
 716             UI.saveSetting('view_only');
 717             UI.saveSetting('path');
 718             UI.saveSetting('repeaterID');
 719             UI.saveSetting('stylesheet');
 720             UI.saveSetting('logging');
 721
 722             // Settings with immediate (non-connected related) effect
 723             WebUtil.selectStylesheet(UI.getSetting('stylesheet'));
 724             WebUtil.init_logging(UI.getSetting('logging'));
 725             UI.updateViewClip();
 726             UI.updateViewDrag();
 727             //Util.Debug("<< settingsApply");
 728         },
 729
 730 /* ------^-------
 731  *   /SETTINGS
 732  * ==============
 733  *    PANELS
 734  * ------v------*/
 735
 736         closeAllPanels: function() {
 737             UI.closeSettingsPanel();
 738             UI.closeXvpPanel();
 739             UI.closeClipboardPanel();
 740             UI.closeConnectPanel();
 741             UI.closeExtraKeys();
 742         },
 743
 744 /* ------^-------
 745  *   /PANELS
 746  * ==============
 747  * SETTINGS (panel)
 748  * ------v------*/
 749
 750         openSettingsPanel: function() {
 751             UI.closeAllPanels();
 752             UI.openControlbar();
 753
 754             UI.updateSetting('encrypt');
 755             UI.updateSetting('true_color');
 756             if (Util.browserSupportsCursorURIs()) {
 757                 UI.updateSetting('cursor');
 758             } else {
 759                 UI.updateSetting('cursor', !UI.isTouchDevice);
 760                 document.getElementById('noVNC_setting_cursor').disabled = true;
 761             }
 762             UI.updateSetting('clip');
 763             UI.updateSetting('resize');
 764             UI.updateSetting('shared');
 765             UI.updateSetting('view_only');
 766             UI.updateSetting('path');
 767             UI.updateSetting('repeaterID');
 768             UI.updateSetting('stylesheet');
 769             UI.updateSetting('logging');
 770
 771             document.getElementById('noVNC_settings')
 772                 .classList.add("noVNC_open");
 773             document.getElementById('noVNC_settings_button')
 774                 .classList.add("noVNC_selected");
 775         },
 776
 777         closeSettingsPanel: function() {
 778             document.getElementById('noVNC_settings')
 779                 .classList.remove("noVNC_open");
 780             document.getElementById('noVNC_settings_button')
 781                 .classList.remove("noVNC_selected");
 782         },
 783
 784         // Toggle the settings menu:
 785         //   On open, settings are refreshed from saved cookies.
 786         //   On close, settings are applied
 787         toggleSettingsPanel: function() {
 788             if (document.getElementById('noVNC_settings')
 789                 .classList.contains("noVNC_open")) {
 790                 UI.settingsApply();
 791                 UI.closeSettingsPanel();
 792             } else {
 793                 UI.openSettingsPanel();
 794             }
 795         },
 796
 797 /* ------^-------
 798  *   /SETTINGS
 799  * ==============
 800  *      XVP
 801  * ------v------*/
 802
 803         openXvpPanel: function() {
 804             UI.closeAllPanels();
 805             UI.openControlbar();
 806
 807             document.getElementById('noVNC_xvp')
 808                 .classList.add("noVNC_open");
 809             document.getElementById('noVNC_xvp_button')
 810                 .classList.add("noVNC_selected");
 811         },
 812
 813         closeXvpPanel: function() {
 814             document.getElementById('noVNC_xvp')
 815                 .classList.remove("noVNC_open");
 816             document.getElementById('noVNC_xvp_button')
 817                 .classList.remove("noVNC_selected");
 818         },
 819
 820         toggleXvpPanel: function() {
 821             if (document.getElementById('noVNC_xvp')
 822                 .classList.contains("noVNC_open")) {
 823                 UI.closeXvpPanel();
 824             } else {
 825                 UI.openXvpPanel();
 826             }
 827         },
 828
 829         // Disable/enable XVP button
 830         updateXvpButton: function(ver) {
 831             if (ver >= 1) {
 832                 document.getElementById('noVNC_xvp_button')
 833                     .classList.remove("noVNC_hidden");
 834             } else {
 835                 document.getElementById('noVNC_xvp_button')
 836                     .classList.add("noVNC_hidden");
 837                 // Close XVP panel if open
 838                 UI.closeXvpPanel();
 839             }
 840         },
 841
 842 /* ------^-------
 843  *     /XVP
 844  * ==============
 845  *   CLIPBOARD
 846  * ------v------*/
 847
 848         openClipboardPanel: function() {
 849             UI.closeAllPanels();
 850             UI.openControlbar();
 851
 852             document.getElementById('noVNC_clipboard')
 853                 .classList.add("noVNC_open");
 854             document.getElementById('noVNC_clipboard_button')
 855                 .classList.add("noVNC_selected");
 856         },
 857
 858         closeClipboardPanel: function() {
 859             document.getElementById('noVNC_clipboard')
 860                 .classList.remove("noVNC_open");
 861             document.getElementById('noVNC_clipboard_button')
 862                 .classList.remove("noVNC_selected");
 863         },
 864
 865         toggleClipboardPanel: function() {
 866             if (document.getElementById('noVNC_clipboard')
 867                 .classList.contains("noVNC_open")) {
 868                 UI.closeClipboardPanel();
 869             } else {
 870                 UI.openClipboardPanel();
 871             }
 872         },
 873
 874         clipboardReceive: function(rfb, text) {
 875             Util.Debug(">> UI.clipboardReceive: " + text.substr(0,40) + "...");
 876             document.getElementById('noVNC_clipboard_text').value = text;
 877             Util.Debug("<< UI.clipboardReceive");
 878         },
 879
 880         clipboardClear: function() {
 881             document.getElementById('noVNC_clipboard_text').value = "";
 882             UI.rfb.clipboardPasteFrom("");
 883         },
 884
 885         clipboardSend: function() {
 886             var text = document.getElementById('noVNC_clipboard_text').value;
 887             Util.Debug(">> UI.clipboardSend: " + text.substr(0,40) + "...");
 888             UI.rfb.clipboardPasteFrom(text);
 889             Util.Debug("<< UI.clipboardSend");
 890         },
 891
 892 /* ------^-------
 893  *  /CLIPBOARD
 894  * ==============
 895  *  CONNECTION
 896  * ------v------*/
 897
 898         openConnectPanel: function() {
 899             UI.closeAllPanels();
 900             UI.openControlbar();
 901
 902             document.getElementById('noVNC_connect_controls')
 903                 .classList.add("noVNC_open");
 904             document.getElementById('noVNC_connect_controls_button')
 905                 .classList.add("noVNC_selected");
 906
 907             document.getElementById('noVNC_setting_host').focus();
 908         },
 909
 910         closeConnectPanel: function() {
 911             document.getElementById('noVNC_connect_controls')
 912                 .classList.remove("noVNC_open");
 913             document.getElementById('noVNC_connect_controls_button')
 914                 .classList.remove("noVNC_selected");
 915
 916             UI.saveSetting('host');
 917             UI.saveSetting('port');
 918             UI.saveSetting('token');
 919             //UI.saveSetting('password');
 920         },
 921
 922         toggleConnectPanel: function() {
 923             if (document.getElementById('noVNC_connect_controls')
 924                 .classList.contains("noVNC_open")) {
 925                 UI.closeConnectPanel();
 926             } else {
 927                 UI.openConnectPanel();
 928             }
 929         },
 930
 931         connect: function() {
 932             var host = document.getElementById('noVNC_setting_host').value;
 933             var port = document.getElementById('noVNC_setting_port').value;
 934             var password = document.getElementById('noVNC_setting_password').value;
 935             var token = document.getElementById('noVNC_setting_token').value;
 936             var path = document.getElementById('noVNC_setting_path').value;
 937
 938             //if token is in path then ignore the new token variable
 939             if (token) {
 940                 path = WebUtil.injectParamIfMissing(path, "token", token);
 941             }
 942
 943             if ((!host) || (!port)) {
 944                 UI.showStatus("Must set host and port", 'error');
 945                 return;
 946             }
 947
 948             if (!UI.initRFB()) return;
 949
 950             UI.closeAllPanels();
 951
 952             UI.rfb.set_encrypt(UI.getSetting('encrypt'));
 953             UI.rfb.set_true_color(UI.getSetting('true_color'));
 954             UI.rfb.set_local_cursor(UI.getSetting('cursor'));
 955             UI.rfb.set_shared(UI.getSetting('shared'));
 956             UI.rfb.set_view_only(UI.getSetting('view_only'));
 957             UI.rfb.set_repeaterID(UI.getSetting('repeaterID'));
 958
 959             UI.rfb.connect(host, port, password, path);
 960         },
 961
 962         disconnect: function() {
 963             UI.closeAllPanels();
 964             UI.rfb.disconnect();
 965
 966             // Restore the callback used for initial resize
 967             UI.rfb.set_onFBUComplete(UI.initialResize);
 968
 969             // Don't display the connection settings until we're actually disconnected
 970         },
 971
 972         disconnectFinished: function (rfb, reason) {
 973             if (typeof reason !== 'undefined') {
 974                 UI.showStatus(reason, 'error');
 975             }
 976             UI.openConnectPanel();
 977         },
 978
 979 /* ------^-------
 980  *  /CONNECTION
 981  * ==============
 982  *   PASSWORD
 983  * ------v------*/
 984
 985         passwordRequired: function(rfb, msg) {
 986
 987             document.getElementById('noVNC_password_dlg')
 988                 .classList.add('noVNC_open');
 989
 990             setTimeout(function () {
 991                     document.getElementById('noVNC_password_input').focus();
 992                 }, 100);
 993
 994             if (typeof msg === 'undefined') {
 995                 msg = "Password is required";
 996             }
 997             UI.showStatus(msg, "warning");
 998         },
 999
1000         setPassword: function() {
1001             UI.rfb.sendPassword(document.getElementById('noVNC_password_input').value);
1002             document.getElementById('noVNC_password_dlg')
1003                 .classList.remove('noVNC_open');
1004             return false;
1005         },
1006
1007 /* ------^-------
1008  *  /PASSWORD
1009  * ==============
1010  *   FULLSCREEN
1011  * ------v------*/
1012
1013         toggleFullscreen: function() {
1014             if (document.fullscreenElement || // alternative standard method
1015                 document.mozFullScreenElement || // currently working methods
1016                 document.webkitFullscreenElement ||
1017                 document.msFullscreenElement) {
1018                 if (document.exitFullscreen) {
1019                     document.exitFullscreen();
1020                 } else if (document.mozCancelFullScreen) {
1021                     document.mozCancelFullScreen();
1022                 } else if (document.webkitExitFullscreen) {
1023                     document.webkitExitFullscreen();
1024                 } else if (document.msExitFullscreen) {
1025                     document.msExitFullscreen();
1026                 }
1027             } else {
1028                 if (document.documentElement.requestFullscreen) {
1029                     document.documentElement.requestFullscreen();
1030                 } else if (document.documentElement.mozRequestFullScreen) {
1031                     document.documentElement.mozRequestFullScreen();
1032                 } else if (document.documentElement.webkitRequestFullscreen) {
1033                     document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
1034                 } else if (document.body.msRequestFullscreen) {
1035                     document.body.msRequestFullscreen();
1036                 }
1037             }
1038             UI.enableDisableViewClip();
1039             UI.updateFullscreenButton();
1040         },
1041
1042         updateFullscreenButton: function() {
1043             if (document.fullscreenElement || // alternative standard method
1044                 document.mozFullScreenElement || // currently working methods
1045                 document.webkitFullscreenElement ||
1046                 document.msFullscreenElement ) {
1047                 document.getElementById('noVNC_fullscreen_button')
1048                     .classList.add("noVNC_selected");
1049             } else {
1050                 document.getElementById('noVNC_fullscreen_button')
1051                     .classList.remove("noVNC_selected");
1052             }
1053         },
1054
1055 /* ------^-------
1056  *  /FULLSCREEN
1057  * ==============
1058  *     RESIZE
1059  * ------v------*/
1060
1061         // Apply remote resizing or local scaling
1062         applyResizeMode: function() {
1063             if (!UI.rfb) return;
1064
1065             var screen = UI.screenSize();
1066
1067             if (screen && UI.connected && UI.rfb.get_display()) {
1068
1069                 var display = UI.rfb.get_display();
1070                 var resizeMode = UI.getSetting('resize');
1071
1072                 if (resizeMode === 'remote') {
1073
1074                     // Request changing the resolution of the remote display to
1075                     // the size of the local browser viewport.
1076
1077                     // In order to not send multiple requests before the browser-resize
1078                     // is finished we wait 0.5 seconds before sending the request.
1079                     clearTimeout(UI.resizeTimeout);
1080                     UI.resizeTimeout = setTimeout(function(){
1081
1082                         // Limit the viewport to the size of the browser window
1083                         display.set_maxWidth(screen.w);
1084                         display.set_maxHeight(screen.h);
1085
1086                         Util.Debug('Attempting requestDesktopSize(' +
1087                                    screen.w + ', ' + screen.h + ')');
1088
1089                         // Request a remote size covering the viewport
1090                         UI.rfb.requestDesktopSize(screen.w, screen.h);
1091                     }, 500);
1092
1093                 } else if (resizeMode === 'scale' || resizeMode === 'downscale') {
1094                     var downscaleOnly = resizeMode === 'downscale';
1095                     var scaleRatio = display.autoscale(screen.w, screen.h, downscaleOnly);
1096                     UI.rfb.get_mouse().set_scale(scaleRatio);
1097                     Util.Debug('Scaling by ' + UI.rfb.get_mouse().get_scale());
1098                 }
1099             }
1100         },
1101
1102         // The screen is always the same size as the available viewport
1103         // in the browser window minus the height of the control bar
1104         screenSize: function() {
1105             var screen = document.getElementById('noVNC_screen');
1106
1107             // Hide the scrollbars until the size is calculated
1108             screen.style.overflow = "hidden";
1109
1110             var pos = Util.getPosition(screen);
1111             var w = pos.width;
1112             var h = pos.height;
1113
1114             screen.style.overflow = "visible";
1115
1116             if (isNaN(w) || isNaN(h)) {
1117                 return false;
1118             } else {
1119                 return {w: w, h: h};
1120             }
1121         },
1122
1123         // Normally we only apply the current resize mode after a window resize
1124         // event. This means that when a new connection is opened, there is no
1125         // resize mode active.
1126         // We have to wait until the first FBU because this is where the client
1127         // will find the supported encodings of the server. Some calls later in
1128         // the chain is dependant on knowing the server-capabilities.
1129         initialResize: function(rfb, fbu) {
1130             UI.applyResizeMode();
1131             // After doing this once, we remove the callback.
1132             UI.rfb.set_onFBUComplete(function() { });
1133         },
1134
1135 /* ------^-------
1136  *    /RESIZE
1137  * ==============
1138  *    CLIPPING
1139  * ------v------*/
1140
1141         // Set and configure viewport clipping
1142         setViewClip: function(clip) {
1143             UI.updateSetting('clip', clip);
1144             UI.updateViewClip();
1145         },
1146
1147         // Update parameters that depend on the clip setting
1148         updateViewClip: function() {
1149             var display;
1150             if (!UI.rfb) return;
1151
1152             var display = UI.rfb.get_display();
1153             var cur_clip = display.get_viewport();
1154             var new_clip = UI.getSetting('clip');
1155
1156             if (cur_clip !== new_clip) {
1157                 display.set_viewport(new_clip);
1158             }
1159
1160             var size = UI.screenSize();
1161
1162             if (new_clip && size) {
1163                 // When clipping is enabled, the screen is limited to
1164                 // the size of the browser window.
1165                 display.set_maxWidth(size.w);
1166                 display.set_maxHeight(size.h);
1167
1168                 var screen = document.getElementById('noVNC_screen');
1169                 var canvas = document.getElementById('noVNC_canvas');
1170
1171                 // Hide potential scrollbars that can skew the position
1172                 screen.style.overflow = "hidden";
1173
1174                 // The x position marks the left margin of the canvas,
1175                 // remove the margin from both sides to keep it centered.
1176                 var new_w = size.w - (2 * Util.getPosition(canvas).x);
1177
1178                 screen.style.overflow = "visible";
1179
1180                 display.viewportChangeSize(new_w, size.h);
1181             } else {
1182                 // Disable max dimensions
1183                 display.set_maxWidth(0);
1184                 display.set_maxHeight(0);
1185                 display.viewportChangeSize();
1186             }
1187         },
1188
1189         // Handle special cases where clipping is forced on/off or locked
1190         enableDisableViewClip: function() {
1191             var resizeSetting = document.getElementById('noVNC_setting_resize');
1192
1193             if (UI.isSafari) {
1194                 // Safari auto-hides the scrollbars which makes them
1195                 // impossible to use in most cases
1196                 UI.setViewClip(true);
1197                 document.getElementById('noVNC_setting_clip').disabled = true;
1198             } else if (resizeSetting.value === 'downscale' || resizeSetting.value === 'scale') {
1199                 // Disable clipping if we are scaling
1200                 UI.setViewClip(false);
1201                 document.getElementById('noVNC_setting_clip').disabled = true;
1202             } else if (document.msFullscreenElement) {
1203                 // The browser is IE and we are in fullscreen mode.
1204                 // - We need to force clipping while in fullscreen since
1205                 //   scrollbars doesn't work.
1206                 UI.showStatus("Forcing clipping mode since scrollbars aren't supported by IE in fullscreen");
1207                 UI.rememberedClipSetting = UI.getSetting('clip');
1208                 UI.setViewClip(true);
1209                 document.getElementById('noVNC_setting_clip').disabled = true;
1210             } else if (document.body.msRequestFullscreen && UI.rememberedClip !== null) {
1211                 // Restore view clip to what it was before fullscreen on IE
1212                 UI.setViewClip(UI.rememberedClipSetting);
1213                 document.getElementById('noVNC_setting_clip').disabled =
1214                     UI.connected || UI.isTouchDevice;
1215             } else {
1216                 document.getElementById('noVNC_setting_clip').disabled =
1217                     UI.connected || UI.isTouchDevice;
1218                 if (UI.isTouchDevice) {
1219                     UI.setViewClip(true);
1220                 }
1221             }
1222         },
1223
1224 /* ------^-------
1225  *   /CLIPPING
1226  * ==============
1227  *    VIEWDRAG
1228  * ------v------*/
1229
1230         toggleViewDrag: function() {
1231             if (!UI.rfb) return;
1232
1233             var drag = UI.rfb.get_viewportDrag();
1234             UI.setViewDrag(!drag);
1235          },
1236
1237         // Set the view drag mode which moves the viewport on mouse drags
1238         setViewDrag: function(drag) {
1239             if (!UI.rfb) return;
1240
1241             UI.rfb.set_viewportDrag(drag);
1242
1243             UI.updateViewDrag();
1244         },
1245
1246         updateViewDrag: function() {
1247             var clipping = false;
1248
1249             if (!UI.connected) return;
1250
1251             // Check if viewport drag is possible. It is only possible
1252             // if the remote display is clipping the client display.
1253             if (UI.rfb.get_display().get_viewport() &&
1254                 UI.rfb.get_display().clippingDisplay()) {
1255                 clipping = true;
1256             }
1257
1258             var viewDragButton = document.getElementById('noVNC_view_drag_button');
1259
1260             if (!clipping &&
1261                 UI.rfb.get_viewportDrag()) {
1262                 // The size of the remote display is the same or smaller
1263                 // than the client display. Make sure viewport drag isn't
1264                 // active when it can't be used.
1265                 UI.rfb.set_viewportDrag(false);
1266             }
1267
1268             if (UI.rfb.get_viewportDrag()) {
1269                 viewDragButton.classList.add("noVNC_selected");
1270             } else {
1271                 viewDragButton.classList.remove("noVNC_selected");
1272             }
1273
1274             // Different behaviour for touch vs non-touch
1275             // The button is disabled instead of hidden on touch devices
1276             if (UI.isTouchDevice) {
1277                 viewDragButton.classList.remove("noVNC_hidden");
1278
1279                 if (clipping) {
1280                     viewDragButton.disabled = false;
1281                 } else {
1282                     viewDragButton.disabled = true;
1283                 }
1284             } else {
1285                 viewDragButton.disabled = false;
1286
1287                 if (clipping) {
1288                     viewDragButton.classList.remove("noVNC_hidden");
1289                 } else {
1290                     viewDragButton.classList.add("noVNC_hidden");
1291                 }
1292             }
1293         },
1294
1295 /* ------^-------
1296  *   /VIEWDRAG
1297  * ==============
1298  *    KEYBOARD
1299  * ------v------*/
1300
1301         showVirtualKeyboard: function() {
1302             if (!UI.isTouchDevice) return;
1303
1304             var input = document.getElementById('noVNC_keyboardinput');
1305
1306             if (document.activeElement == input) return;
1307
1308             UI.keyboardVisible = true;
1309             document.getElementById('noVNC_keyboard_button')
1310                 .classList.add("noVNC_selected");
1311             input.focus();
1312
1313             try {
1314                 var l = input.value.length;
1315                 // Move the caret to the end
1316                 input.setSelectionRange(l, l);
1317             } catch (err) {} // setSelectionRange is undefined in Google Chrome
1318         },
1319
1320         hideVirtualKeyboard: function() {
1321             if (!UI.isTouchDevice) return;
1322
1323             var input = document.getElementById('noVNC_keyboardinput');
1324
1325             if (document.activeElement != input) return;
1326
1327             input.blur();
1328         },
1329
1330         toggleVirtualKeyboard: function () {
1331             if (UI.keyboardVisible) {
1332                 UI.hideVirtualKeyboard();
1333             } else {
1334                 UI.showVirtualKeyboard();
1335             }
1336         },
1337
1338         onblurVirtualKeyboard: function() {
1339             //Weird bug in iOS if you change keyboardVisible
1340             //here it does not actually occur so next time
1341             //you click keyboard icon it doesnt work.
1342             UI.hideKeyboardTimeout = setTimeout(function() {
1343                 UI.keyboardVisible = false;
1344                 document.getElementById('noVNC_keyboard_button')
1345                         .classList.remove("noVNC_selected");
1346             },100);
1347         },
1348
1349         keepKeyboard: function() {
1350             clearTimeout(UI.hideKeyboardTimeout);
1351             if(UI.keyboardVisible === true) {
1352                 UI.showVirtualKeyboard();
1353             } else if(UI.keyboardVisible === false) {
1354                 UI.hideVirtualKeyboard();
1355             }
1356         },
1357
1358         keyboardinputReset: function() {
1359             var kbi = document.getElementById('noVNC_keyboardinput');
1360             kbi.value = new Array(UI.defaultKeyboardinputLen).join("_");
1361             UI.lastKeyboardinput = kbi.value;
1362         },
1363
1364         // When normal keyboard events are left uncought, use the input events from
1365         // the keyboardinput element instead and generate the corresponding key events.
1366         // This code is required since some browsers on Android are inconsistent in
1367         // sending keyCodes in the normal keyboard events when using on screen keyboards.
1368         keyInput: function(event) {
1369
1370             if (!UI.rfb) return;
1371
1372             var newValue = event.target.value;
1373
1374             if (!UI.lastKeyboardinput) {
1375                 UI.keyboardinputReset();
1376             }
1377             var oldValue = UI.lastKeyboardinput;
1378
1379             var newLen;
1380             try {
1381                 // Try to check caret position since whitespace at the end
1382                 // will not be considered by value.length in some browsers
1383                 newLen = Math.max(event.target.selectionStart, newValue.length);
1384             } catch (err) {
1385                 // selectionStart is undefined in Google Chrome
1386                 newLen = newValue.length;
1387             }
1388             var oldLen = oldValue.length;
1389
1390             var backspaces;
1391             var inputs = newLen - oldLen;
1392             if (inputs < 0) {
1393                 backspaces = -inputs;
1394             } else {
1395                 backspaces = 0;
1396             }
1397
1398             // Compare the old string with the new to account for
1399             // text-corrections or other input that modify existing text
1400             var i;
1401             for (i = 0; i < Math.min(oldLen, newLen); i++) {
1402                 if (newValue.charAt(i) != oldValue.charAt(i)) {
1403                     inputs = newLen - i;
1404                     backspaces = oldLen - i;
1405                     break;
1406                 }
1407             }
1408
1409             // Send the key events
1410             for (i = 0; i < backspaces; i++) {
1411                 UI.rfb.sendKey(KeyTable.XK_BackSpace);
1412             }
1413             for (i = newLen - inputs; i < newLen; i++) {
1414                 UI.rfb.sendKey(newValue.charCodeAt(i));
1415             }
1416
1417             // Control the text content length in the keyboardinput element
1418             if (newLen > 2 * UI.defaultKeyboardinputLen) {
1419                 UI.keyboardinputReset();
1420             } else if (newLen < 1) {
1421                 // There always have to be some text in the keyboardinput
1422                 // element with which backspace can interact.
1423                 UI.keyboardinputReset();
1424                 // This sometimes causes the keyboard to disappear for a second
1425                 // but it is required for the android keyboard to recognize that
1426                 // text has been added to the field
1427                 event.target.blur();
1428                 // This has to be ran outside of the input handler in order to work
1429                 setTimeout(UI.keepKeyboard, 0);
1430             } else {
1431                 UI.lastKeyboardinput = newValue;
1432             }
1433         },
1434
1435 /* ------^-------
1436  *   /KEYBOARD
1437  * ==============
1438  *   EXTRA KEYS
1439  * ------v------*/
1440
1441         openExtraKeys: function() {
1442             UI.closeAllPanels();
1443             UI.openControlbar();
1444
1445             document.getElementById('noVNC_modifiers')
1446                 .classList.add("noVNC_open");
1447             document.getElementById('noVNC_toggle_extra_keys_button')
1448                 .classList.add("noVNC_selected");
1449         },
1450
1451         closeExtraKeys: function() {
1452             document.getElementById('noVNC_modifiers')
1453                 .classList.remove("noVNC_open");
1454             document.getElementById('noVNC_toggle_extra_keys_button')
1455                 .classList.remove("noVNC_selected");
1456         },
1457
1458         toggleExtraKeys: function() {
1459             UI.keepKeyboard();
1460             if(document.getElementById('noVNC_modifiers')
1461                 .classList.contains("noVNC_open")) {
1462                 UI.closeExtraKeys();
1463             } else  {
1464                 UI.openExtraKeys();
1465             }
1466         },
1467
1468         sendEsc: function() {
1469             UI.keepKeyboard();
1470             UI.rfb.sendKey(KeyTable.XK_Escape);
1471         },
1472
1473         sendTab: function() {
1474             UI.keepKeyboard();
1475             UI.rfb.sendKey(KeyTable.XK_Tab);
1476         },
1477
1478         toggleCtrl: function() {
1479             UI.keepKeyboard();
1480             var btn = document.getElementById('noVNC_toggle_ctrl_button');
1481             if (btn.classList.contains("noVNC_selected")) {
1482                 UI.rfb.sendKey(KeyTable.XK_Control_L, false);
1483                 btn.classList.remove("noVNC_selected");
1484             } else {
1485                 UI.rfb.sendKey(KeyTable.XK_Control_L, true);
1486                 btn.classList.add("noVNC_selected");
1487             }
1488         },
1489
1490         toggleAlt: function() {
1491             UI.keepKeyboard();
1492             var btn = document.getElementById('noVNC_toggle_alt_button');
1493             if (btn.classList.contains("noVNC_selected")) {
1494                 UI.rfb.sendKey(KeyTable.XK_Alt_L, false);
1495                 btn.classList.remove("noVNC_selected");
1496             } else {
1497                 UI.rfb.sendKey(KeyTable.XK_Alt_L, true);
1498                 btn.classList.add("noVNC_selected");
1499             }
1500         },
1501
1502         sendCtrlAltDel: function() {
1503             UI.keepKeyboard();
1504             UI.rfb.sendCtrlAltDel();
1505         },
1506
1507 /* ------^-------
1508  *   /EXTRA KEYS
1509  * ==============
1510  *     MISC
1511  * ------v------*/
1512
1513         setMouseButton: function(num) {
1514             if (UI.rfb) {
1515                 UI.rfb.get_mouse().set_touchButton(num);
1516             }
1517
1518             var blist = [0, 1,2,4];
1519             for (var b = 0; b < blist.length; b++) {
1520                 var button = document.getElementById('noVNC_mouse_button' + blist[b]);
1521                 if (blist[b] === num) {
1522                     button.classList.remove("noVNC_hidden");
1523                 } else {
1524                     button.classList.add("noVNC_hidden");
1525                 }
1526             }
1527         },
1528
1529         displayBlur: function() {
1530             if (!UI.rfb) return;
1531
1532             UI.rfb.get_keyboard().set_focused(false);
1533             UI.rfb.get_mouse().set_focused(false);
1534         },
1535
1536         displayFocus: function() {
1537             if (!UI.rfb) return;
1538
1539             UI.rfb.get_keyboard().set_focused(true);
1540             UI.rfb.get_mouse().set_focused(true);
1541         },
1542
1543         updateDesktopName: function(rfb, name) {
1544             UI.desktopName = name;
1545             // Display the desktop name in the document title
1546             document.title = name + " - noVNC";
1547         },
1548
1549         //Helper to add options to dropdown.
1550         addOption: function(selectbox, text, value) {
1551             var optn = document.createElement("OPTION");
1552             optn.text = text;
1553             optn.value = value;
1554             selectbox.options.add(optn);
1555         },
1556
1557 /* ------^-------
1558  *    /MISC
1559  * ==============
1560  */
1561     };
1562
1563     /* [module] UI.load(); */
1564 })();
1565
1566 /* [module] export default UI; */