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 keysyms from "./keysymdef";
  18  * import RFB from "../core/rfb";
  19  * import Display from "../core/display";
  20  * import WebUtil from "./webutil";
  21  */
  22
  23 var UI;
  24
  25 (function () {
  26     "use strict";
  27
  28     // Fallback for all uncought errors
  29     window.addEventListener('error', function(event) {
  30         try {
  31             var msg, div, text;
  32
  33             msg = document.getElementById('noVNC_fallback_errormsg');
  34
  35             // Only show the initial error
  36             if (msg.hasChildNodes()) {
  37                 return false;
  38             }
  39
  40             div = document.createElement("div");
  41             div.appendChild(document.createTextNode(event.message));
  42             msg.appendChild(div);
  43
  44             div = document.createElement("div");
  45             div.className = 'noVNC_location';
  46             text = event.filename + ":" + event.lineno + ":" + event.colno;
  47             div.appendChild(document.createTextNode(text));
  48             msg.appendChild(div);
  49
  50             if ((event.error !== undefined) &&
  51                 (event.error.stack !== undefined)) {
  52                 div = document.createElement("div");
  53                 div.className = 'noVNC_stack';
  54                 div.appendChild(document.createTextNode(event.error.stack));
  55                 msg.appendChild(div);
  56             }
  57
  58             document.getElementById('noVNC_fallback_error')
  59                 .classList.add("noVNC_open");
  60         } catch (exc) {
  61             document.write("noVNC encountered an error.");
  62         }
  63         // Don't return true since this would prevent the error
  64         // from being printed to the browser console.
  65         return false;
  66     });
  67
  68     // Set up translations
  69     var LINGUAS = ["de", "el", "nl", "sv"];
  70     Util.Localisation.setup(LINGUAS);
  71     if (Util.Localisation.language !== "en") {
  72         WebUtil.load_scripts(
  73             {'app': ["locale/" + Util.Localisation.language + ".js"]});
  74     }
  75
  76     /* [begin skip-as-module] */
  77     // Load supporting scripts
  78     WebUtil.load_scripts(
  79         {'core': ["base64.js", "websock.js", "des.js", "input/keysymdef.js",
  80                   "input/xtscancodes.js", "input/util.js", "input/devices.js",
  81                   "display.js", "inflator.js", "rfb.js", "input/keysym.js"]});
  82
  83     window.onscriptsload = function () { UI.load(); };
  84     /* [end skip-as-module] */
  85
  86     var _ = Util.Localisation.get;
  87
  88     UI = {
  89
  90         connected: false,
  91         desktopName: "",
  92
  93         resizeTimeout: null,
  94         statusTimeout: null,
  95         hideKeyboardTimeout: null,
  96         idleControlbarTimeout: null,
  97         closeControlbarTimeout: null,
  98
  99         controlbarGrabbed: false,
 100         controlbarDrag: false,
 101         controlbarMouseDownClientY: 0,
 102         controlbarMouseDownOffsetY: 0,
 103
 104         isSafari: false,
 105         rememberedClipSetting: null,
 106         lastKeyboardinput: null,
 107         defaultKeyboardinputLen: 100,
 108
 109         inhibit_reconnect: true,
 110         reconnect_callback: null,
 111         reconnect_password: null,
 112
 113         // Setup rfb object, load settings from browser storage, then call
 114         // UI.init to setup the UI/menus
 115         load: function(callback) {
 116             WebUtil.initSettings(UI.start, callback);
 117         },
 118
 119         // Render default UI and initialize settings menu
 120         start: function(callback) {
 121
 122             // Setup global variables first
 123             UI.isSafari = (navigator.userAgent.indexOf('Safari') !== -1 &&
 124                            navigator.userAgent.indexOf('Chrome') === -1);
 125
 126             UI.initSettings();
 127
 128             // Translate the DOM
 129             Util.Localisation.translateDOM();
 130
 131             // Adapt the interface for touch screen devices
 132             if (Util.isTouchDevice) {
 133                 document.documentElement.classList.add("noVNC_touch");
 134                 // Remove the address bar
 135                 setTimeout(function() { window.scrollTo(0, 1); }, 100);
 136                 UI.forceSetting('clip', true);
 137             } else {
 138                 UI.initSetting('clip', false);
 139             }
 140
 141             // Restore control bar position
 142             if (WebUtil.readSetting('controlbar_pos') === 'right') {
 143                 UI.toggleControlbarSide();
 144             }
 145
 146             UI.initFullscreen();
 147
 148             // Setup event handlers
 149             UI.addResizeHandlers();
 150             UI.addControlbarHandlers();
 151             UI.addTouchSpecificHandlers();
 152             UI.addExtraKeysHandlers();
 153             UI.addXvpHandlers();
 154             UI.addConnectionControlHandlers();
 155             UI.addClipboardHandlers();
 156             UI.addSettingsHandlers();
 157             document.getElementById("noVNC_status")
 158                 .addEventListener('click', UI.hideStatus);
 159
 160             UI.openControlbar();
 161
 162             // Show the connect panel on first load unless autoconnecting
 163             if (!autoconnect) {
 164                 UI.openConnectPanel();
 165             }
 166
 167             UI.updateViewClip();
 168
 169             UI.updateVisualState();
 170
 171             document.getElementById('noVNC_setting_host').focus();
 172
 173             var autoconnect = WebUtil.getConfigVar('autoconnect', false);
 174             if (autoconnect === 'true' || autoconnect == '1') {
 175                 autoconnect = true;
 176                 UI.connect();
 177             } else {
 178                 autoconnect = false;
 179             }
 180
 181             if (typeof callback === "function") {
 182                 callback(UI.rfb);
 183             }
 184         },
 185
 186         initFullscreen: function() {
 187             // Only show the button if fullscreen is properly supported
 188             // * Safari doesn't support alphanumerical input while in fullscreen
 189             if (!UI.isSafari &&
 190                 (document.documentElement.requestFullscreen ||
 191                  document.documentElement.mozRequestFullScreen ||
 192                  document.documentElement.webkitRequestFullscreen ||
 193                  document.body.msRequestFullscreen)) {
 194                 document.getElementById('noVNC_fullscreen_button')
 195                     .classList.remove("noVNC_hidden");
 196                 UI.addFullscreenHandlers();
 197             }
 198         },
 199
 200         initSettings: function() {
 201             var i;
 202
 203             // Logging selection dropdown
 204             var llevels = ['error', 'warn', 'info', 'debug'];
 205             for (i = 0; i < llevels.length; i += 1) {
 206                 UI.addOption(document.getElementById('noVNC_setting_logging'),llevels[i], llevels[i]);
 207             }
 208
 209             // Settings with immediate effects
 210             UI.initSetting('logging', 'warn');
 211             UI.updateLogging();
 212
 213             // if port == 80 (or 443) then it won't be present and should be
 214             // set manually
 215             var port = window.location.port;
 216             if (!port) {
 217                 if (window.location.protocol.substring(0,5) == 'https') {
 218                     port = 443;
 219                 }
 220                 else if (window.location.protocol.substring(0,4) == 'http') {
 221                     port = 80;
 222                 }
 223             }
 224
 225             /* Populate the controls if defaults are provided in the URL */
 226             UI.initSetting('host', window.location.hostname);
 227             UI.initSetting('port', port);
 228             UI.initSetting('encrypt', (window.location.protocol === "https:"));
 229             UI.initSetting('true_color', true);
 230             UI.initSetting('cursor', !Util.isTouchDevice);
 231             UI.initSetting('resize', 'off');
 232             UI.initSetting('shared', true);
 233             UI.initSetting('view_only', false);
 234             UI.initSetting('path', 'websockify');
 235             UI.initSetting('repeaterID', '');
 236             UI.initSetting('reconnect', false);
 237             UI.initSetting('reconnect_delay', 5000);
 238         },
 239
 240         initRFB: function() {
 241             try {
 242                 UI.rfb = new RFB({'target': document.getElementById('noVNC_canvas'),
 243                                   'onNotification': UI.notification,
 244                                   'onUpdateState': UI.updateState,
 245                                   'onDisconnected': UI.disconnectFinished,
 246                                   'onPasswordRequired': UI.passwordRequired,
 247                                   'onXvpInit': UI.updateXvpButton,
 248                                   'onClipboard': UI.clipboardReceive,
 249                                   'onBell': UI.bell,
 250                                   'onFBUComplete': UI.initialResize,
 251                                   'onFBResize': UI.updateSessionSize,
 252                                   'onDesktopName': UI.updateDesktopName});
 253                 return true;
 254             } catch (exc) {
 255                 var msg = "Unable to create RFB client -- " + exc;
 256                 Util.Error(msg);
 257                 UI.showStatus(msg, 'error');
 258                 return false;
 259             }
 260         },
 261
 262 /* ------^-------
 263  *     /INIT
 264  * ==============
 265  * EVENT HANDLERS
 266  * ------v------*/
 267
 268         addResizeHandlers: function() {
 269             window.addEventListener('resize', UI.applyResizeMode);
 270             window.addEventListener('resize', UI.updateViewClip);
 271             window.addEventListener('resize', UI.updateViewDrag);
 272         },
 273
 274         addControlbarHandlers: function() {
 275             document.getElementById("noVNC_control_bar")
 276                 .addEventListener('mousemove', UI.activateControlbar);
 277             document.getElementById("noVNC_control_bar")
 278                 .addEventListener('mouseup', UI.activateControlbar);
 279             document.getElementById("noVNC_control_bar")
 280                 .addEventListener('mousedown', UI.activateControlbar);
 281             document.getElementById("noVNC_control_bar")
 282                 .addEventListener('keypress', UI.activateControlbar);
 283
 284             document.getElementById("noVNC_control_bar")
 285                 .addEventListener('mousedown', UI.keepControlbar);
 286             document.getElementById("noVNC_control_bar")
 287                 .addEventListener('keypress', UI.keepControlbar);
 288
 289             document.getElementById("noVNC_view_drag_button")
 290                 .addEventListener('click', UI.toggleViewDrag);
 291
 292             document.getElementById("noVNC_control_bar_handle")
 293                 .addEventListener('mousedown', UI.controlbarHandleMouseDown);
 294             document.getElementById("noVNC_control_bar_handle")
 295                 .addEventListener('mouseup', UI.controlbarHandleMouseUp);
 296             document.getElementById("noVNC_control_bar_handle")
 297                 .addEventListener('mousemove', UI.dragControlbarHandle);
 298             // resize events aren't available for elements
 299             window.addEventListener('resize', UI.updateControlbarHandle);
 300
 301             var exps = document.getElementsByClassName("noVNC_expander");
 302             for (var i = 0;i < exps.length;i++) {
 303                 exps[i].addEventListener('click', UI.toggleExpander);
 304             }
 305         },
 306
 307         addTouchSpecificHandlers: function() {
 308             document.getElementById("noVNC_mouse_button0")
 309                 .addEventListener('click', function () { UI.setMouseButton(1); });
 310             document.getElementById("noVNC_mouse_button1")
 311                 .addEventListener('click', function () { UI.setMouseButton(2); });
 312             document.getElementById("noVNC_mouse_button2")
 313                 .addEventListener('click', function () { UI.setMouseButton(4); });
 314             document.getElementById("noVNC_mouse_button4")
 315                 .addEventListener('click', function () { UI.setMouseButton(0); });
 316             document.getElementById("noVNC_keyboard_button")
 317                 .addEventListener('click', UI.toggleVirtualKeyboard);
 318
 319             document.getElementById("noVNC_keyboardinput")
 320                 .addEventListener('input', UI.keyInput);
 321             document.getElementById("noVNC_keyboardinput")
 322                 .addEventListener('focus', UI.onfocusVirtualKeyboard);
 323             document.getElementById("noVNC_keyboardinput")
 324                 .addEventListener('blur', UI.onblurVirtualKeyboard);
 325             document.getElementById("noVNC_keyboardinput")
 326                 .addEventListener('submit', function () { return false; });
 327
 328             document.documentElement
 329                 .addEventListener('mousedown', UI.keepVirtualKeyboard, true);
 330
 331             document.getElementById("noVNC_control_bar")
 332                 .addEventListener('touchstart', UI.activateControlbar);
 333             document.getElementById("noVNC_control_bar")
 334                 .addEventListener('touchmove', UI.activateControlbar);
 335             document.getElementById("noVNC_control_bar")
 336                 .addEventListener('touchend', UI.activateControlbar);
 337             document.getElementById("noVNC_control_bar")
 338                 .addEventListener('input', UI.activateControlbar);
 339
 340             document.getElementById("noVNC_control_bar")
 341                 .addEventListener('touchstart', UI.keepControlbar);
 342             document.getElementById("noVNC_control_bar")
 343                 .addEventListener('input', UI.keepControlbar);
 344
 345             document.getElementById("noVNC_control_bar_handle")
 346                 .addEventListener('touchstart', UI.controlbarHandleMouseDown);
 347             document.getElementById("noVNC_control_bar_handle")
 348                 .addEventListener('touchend', UI.controlbarHandleMouseUp);
 349             document.getElementById("noVNC_control_bar_handle")
 350                 .addEventListener('touchmove', UI.dragControlbarHandle);
 351
 352             window.addEventListener('load', UI.keyboardinputReset);
 353         },
 354
 355         addExtraKeysHandlers: function() {
 356             document.getElementById("noVNC_toggle_extra_keys_button")
 357                 .addEventListener('click', UI.toggleExtraKeys);
 358             document.getElementById("noVNC_toggle_ctrl_button")
 359                 .addEventListener('click', UI.toggleCtrl);
 360             document.getElementById("noVNC_toggle_alt_button")
 361                 .addEventListener('click', UI.toggleAlt);
 362             document.getElementById("noVNC_send_tab_button")
 363                 .addEventListener('click', UI.sendTab);
 364             document.getElementById("noVNC_send_esc_button")
 365                 .addEventListener('click', UI.sendEsc);
 366             document.getElementById("noVNC_send_ctrl_alt_del_button")
 367                 .addEventListener('click', UI.sendCtrlAltDel);
 368         },
 369
 370         addXvpHandlers: function() {
 371             document.getElementById("noVNC_xvp_shutdown_button")
 372                 .addEventListener('click', function() { UI.rfb.xvpShutdown(); });
 373             document.getElementById("noVNC_xvp_reboot_button")
 374                 .addEventListener('click', function() { UI.rfb.xvpReboot(); });
 375             document.getElementById("noVNC_xvp_reset_button")
 376                 .addEventListener('click', function() { UI.rfb.xvpReset(); });
 377             document.getElementById("noVNC_xvp_button")
 378                 .addEventListener('click', UI.toggleXvpPanel);
 379         },
 380
 381         addConnectionControlHandlers: function() {
 382             document.getElementById("noVNC_disconnect_button")
 383                 .addEventListener('click', UI.disconnect);
 384             document.getElementById("noVNC_connect_button")
 385                 .addEventListener('click', UI.connect);
 386             document.getElementById("noVNC_cancel_reconnect_button")
 387                 .addEventListener('click', UI.cancelReconnect);
 388
 389             document.getElementById("noVNC_password_button")
 390                 .addEventListener('click', UI.setPassword);
 391         },
 392
 393         addClipboardHandlers: function() {
 394             document.getElementById("noVNC_clipboard_button")
 395                 .addEventListener('click', UI.toggleClipboardPanel);
 396             document.getElementById("noVNC_clipboard_text")
 397                 .addEventListener('focus', UI.displayBlur);
 398             document.getElementById("noVNC_clipboard_text")
 399                 .addEventListener('blur', UI.displayFocus);
 400             document.getElementById("noVNC_clipboard_text")
 401                 .addEventListener('change', UI.clipboardSend);
 402             document.getElementById("noVNC_clipboard_clear_button")
 403                 .addEventListener('click', UI.clipboardClear);
 404         },
 405
 406         // Add a call to save settings when the element changes,
 407         // unless the optional parameter changeFunc is used instead.
 408         addSettingChangeHandler: function(name, changeFunc) {
 409             var settingElem = document.getElementById("noVNC_setting_" + name);
 410             if (changeFunc === undefined) {
 411                 changeFunc = function () { UI.saveSetting(name); };
 412             }
 413             settingElem.addEventListener('change', changeFunc);
 414         },
 415
 416         addSettingsHandlers: function() {
 417             document.getElementById("noVNC_settings_button")
 418                 .addEventListener('click', UI.toggleSettingsPanel);
 419
 420             UI.addSettingChangeHandler('encrypt');
 421             UI.addSettingChangeHandler('true_color');
 422             UI.addSettingChangeHandler('cursor');
 423             UI.addSettingChangeHandler('resize');
 424             UI.addSettingChangeHandler('resize', UI.enableDisableViewClip);
 425             UI.addSettingChangeHandler('resize', UI.applyResizeMode);
 426             UI.addSettingChangeHandler('clip');
 427             UI.addSettingChangeHandler('shared');
 428             UI.addSettingChangeHandler('view_only');
 429             UI.addSettingChangeHandler('host');
 430             UI.addSettingChangeHandler('port');
 431             UI.addSettingChangeHandler('path');
 432             UI.addSettingChangeHandler('repeaterID');
 433             UI.addSettingChangeHandler('logging');
 434             UI.addSettingChangeHandler('logging', UI.updateLogging);
 435             UI.addSettingChangeHandler('reconnect');
 436             UI.addSettingChangeHandler('reconnect_delay');
 437         },
 438
 439         addFullscreenHandlers: function() {
 440             document.getElementById("noVNC_fullscreen_button")
 441                 .addEventListener('click', UI.toggleFullscreen);
 442
 443             window.addEventListener('fullscreenchange', UI.updateFullscreenButton);
 444             window.addEventListener('mozfullscreenchange', UI.updateFullscreenButton);
 445             window.addEventListener('webkitfullscreenchange', UI.updateFullscreenButton);
 446             window.addEventListener('msfullscreenchange', UI.updateFullscreenButton);
 447         },
 448
 449 /* ------^-------
 450  * /EVENT HANDLERS
 451  * ==============
 452  *     VISUAL
 453  * ------v------*/
 454
 455         updateState: function(rfb, state, oldstate) {
 456             var msg;
 457
 458             document.documentElement.classList.remove("noVNC_connecting");
 459             document.documentElement.classList.remove("noVNC_connected");
 460             document.documentElement.classList.remove("noVNC_disconnecting");
 461             document.documentElement.classList.remove("noVNC_reconnecting");
 462
 463             switch (state) {
 464                 case 'connecting':
 465                     document.getElementById("noVNC_transition_text").textContent = _("Connecting...");
 466                     document.documentElement.classList.add("noVNC_connecting");
 467                     break;
 468                 case 'connected':
 469                     UI.connected = true;
 470                     UI.inhibit_reconnect = false;
 471                     document.documentElement.classList.add("noVNC_connected");
 472                     if (rfb && rfb.get_encrypt()) {
 473                         msg = _("Connected (encrypted) to ") + UI.desktopName;
 474                     } else {
 475                         msg = _("Connected (unencrypted) to ") + UI.desktopName;
 476                     }
 477                     UI.showStatus(msg);
 478                     break;
 479                 case 'disconnecting':
 480                     UI.connected = false;
 481                     document.getElementById("noVNC_transition_text").textContent = _("Disconnecting...");
 482                     document.documentElement.classList.add("noVNC_disconnecting");
 483                     break;
 484                 case 'disconnected':
 485                     UI.showStatus(_("Disconnected"));
 486                     break;
 487                 default:
 488                     msg = "Invalid UI state";
 489                     Util.Error(msg);
 490                     UI.showStatus(msg, 'error');
 491                     break;
 492             }
 493
 494             UI.updateVisualState();
 495         },
 496
 497         // Disable/enable controls depending on connection state
 498         updateVisualState: function() {
 499             //Util.Debug(">> updateVisualState");
 500             document.getElementById('noVNC_setting_encrypt').disabled = UI.connected;
 501             document.getElementById('noVNC_setting_true_color').disabled = UI.connected;
 502             if (Util.browserSupportsCursorURIs()) {
 503                 document.getElementById('noVNC_setting_cursor').disabled = UI.connected;
 504             } else {
 505                 UI.updateSetting('cursor', !Util.isTouchDevice);
 506                 document.getElementById('noVNC_setting_cursor').disabled = true;
 507             }
 508
 509             UI.enableDisableViewClip();
 510             document.getElementById('noVNC_setting_shared').disabled = UI.connected;
 511             document.getElementById('noVNC_setting_view_only').disabled = UI.connected;
 512             document.getElementById('noVNC_setting_host').disabled = UI.connected;
 513             document.getElementById('noVNC_setting_port').disabled = UI.connected;
 514             document.getElementById('noVNC_setting_path').disabled = UI.connected;
 515             document.getElementById('noVNC_setting_repeaterID').disabled = UI.connected;
 516             document.getElementById('noVNC_setting_reconnect').disabled = UI.connected;
 517             document.getElementById('noVNC_setting_reconnect_delay').disabled = UI.connected;
 518
 519             if (UI.connected) {
 520                 UI.updateViewClip();
 521                 UI.setMouseButton(1);
 522
 523                 // Hide the controlbar after 2 seconds
 524                 UI.closeControlbarTimeout = setTimeout(UI.closeControlbar, 2000);
 525             } else {
 526                 UI.updateXvpButton(0);
 527                 UI.keepControlbar();
 528             }
 529
 530             // Hide input related buttons in view only mode
 531             if (UI.rfb && UI.rfb.get_view_only()) {
 532                 document.getElementById('noVNC_keyboard_button')
 533                     .classList.add('noVNC_hidden');
 534                 document.getElementById('noVNC_toggle_extra_keys_button')
 535                     .classList.add('noVNC_hidden');
 536             } else {
 537                 document.getElementById('noVNC_keyboard_button')
 538                     .classList.remove('noVNC_hidden');
 539                 document.getElementById('noVNC_toggle_extra_keys_button')
 540                     .classList.remove('noVNC_hidden');
 541             }
 542
 543             // State change disables viewport dragging.
 544             // It is enabled (toggled) by direct click on the button
 545             UI.setViewDrag(false);
 546
 547             // State change also closes the password dialog
 548             document.getElementById('noVNC_password_dlg')
 549                 .classList.remove('noVNC_open');
 550
 551             //Util.Debug("<< updateVisualState");
 552         },
 553
 554         showStatus: function(text, status_type, time) {
 555             var statusElem = document.getElementById('noVNC_status');
 556
 557             clearTimeout(UI.statusTimeout);
 558
 559             if (typeof status_type === 'undefined') {
 560                 status_type = 'normal';
 561             }
 562
 563             statusElem.classList.remove("noVNC_status_normal",
 564                                         "noVNC_status_warn",
 565                                         "noVNC_status_error");
 566
 567             switch (status_type) {
 568                 case 'warning':
 569                 case 'warn':
 570                     statusElem.classList.add("noVNC_status_warn");
 571                     break;
 572                 case 'error':
 573                     statusElem.classList.add("noVNC_status_error");
 574                     break;
 575                 case 'normal':
 576                 case 'info':
 577                 default:
 578                     statusElem.classList.add("noVNC_status_normal");
 579                     break;
 580             }
 581
 582             statusElem.textContent = text;
 583             statusElem.classList.add("noVNC_open");
 584
 585             // If no time was specified, show the status for 1.5 seconds
 586             if (typeof time === 'undefined') {
 587                 time = 1500;
 588             }
 589
 590             // Error messages do not timeout
 591             if (status_type !== 'error') {
 592                 UI.statusTimeout = window.setTimeout(UI.hideStatus, time);
 593             }
 594         },
 595
 596         hideStatus: function() {
 597             clearTimeout(UI.statusTimeout);
 598             document.getElementById('noVNC_status').classList.remove("noVNC_open");
 599         },
 600
 601         notification: function (rfb, msg, level, options) {
 602             UI.showStatus(msg, level);
 603         },
 604
 605         activateControlbar: function(event) {
 606             clearTimeout(UI.idleControlbarTimeout);
 607             // We manipulate the anchor instead of the actual control
 608             // bar in order to avoid creating new a stacking group
 609             document.getElementById('noVNC_control_bar_anchor')
 610                 .classList.remove("noVNC_idle");
 611             UI.idleControlbarTimeout = window.setTimeout(UI.idleControlbar, 2000);
 612         },
 613
 614         idleControlbar: function() {
 615             document.getElementById('noVNC_control_bar_anchor')
 616                 .classList.add("noVNC_idle");
 617         },
 618
 619         keepControlbar: function() {
 620             clearTimeout(UI.closeControlbarTimeout);
 621         },
 622
 623         openControlbar: function() {
 624             document.getElementById('noVNC_control_bar')
 625                 .classList.add("noVNC_open");
 626         },
 627
 628         closeControlbar: function() {
 629             UI.closeAllPanels();
 630             document.getElementById('noVNC_control_bar')
 631                 .classList.remove("noVNC_open");
 632         },
 633
 634         toggleControlbar: function() {
 635             if (document.getElementById('noVNC_control_bar')
 636                 .classList.contains("noVNC_open")) {
 637                 UI.closeControlbar();
 638             } else {
 639                 UI.openControlbar();
 640             }
 641         },
 642
 643         toggleControlbarSide: function () {
 644             // Temporarily disable animation to avoid weird movement
 645             var bar = document.getElementById('noVNC_control_bar');
 646             bar.style.transitionDuration = '0s';
 647             bar.addEventListener('transitionend', function () { this.style.transitionDuration = ""; });
 648
 649             var anchor = document.getElementById('noVNC_control_bar_anchor');
 650             if (anchor.classList.contains("noVNC_right")) {
 651                 WebUtil.writeSetting('controlbar_pos', 'left');
 652                 anchor.classList.remove("noVNC_right");
 653             } else {
 654                 WebUtil.writeSetting('controlbar_pos', 'right');
 655                 anchor.classList.add("noVNC_right");
 656             }
 657
 658             // Consider this a movement of the handle
 659             UI.controlbarDrag = true;
 660         },
 661
 662         dragControlbarHandle: function (e) {
 663             if (!UI.controlbarGrabbed) return;
 664
 665             var ptr = Util.getPointerEvent(e);
 666
 667             var anchor = document.getElementById('noVNC_control_bar_anchor');
 668             if (ptr.clientX < (window.innerWidth * 0.1)) {
 669                 if (anchor.classList.contains("noVNC_right")) {
 670                     UI.toggleControlbarSide();
 671                 }
 672             } else if (ptr.clientX > (window.innerWidth * 0.9)) {
 673                 if (!anchor.classList.contains("noVNC_right")) {
 674                     UI.toggleControlbarSide();
 675                 }
 676             }
 677
 678             if (!UI.controlbarDrag) {
 679                 // The goal is to trigger on a certain physical width, the
 680                 // devicePixelRatio brings us a bit closer but is not optimal.
 681                 var dragThreshold = 10 * (window.devicePixelRatio || 1);
 682                 var dragDistance = Math.abs(ptr.clientY - UI.controlbarMouseDownClientY);
 683
 684                 if (dragDistance < dragThreshold) return;
 685
 686                 UI.controlbarDrag = true;
 687             }
 688
 689             var eventY = ptr.clientY - UI.controlbarMouseDownOffsetY;
 690
 691             UI.moveControlbarHandle(eventY);
 692
 693             e.preventDefault();
 694             e.stopPropagation();
 695             UI.keepControlbar();
 696             UI.activateControlbar();
 697         },
 698
 699         // Move the handle but don't allow any position outside the bounds
 700         moveControlbarHandle: function (viewportRelativeY) {
 701             var handle = document.getElementById("noVNC_control_bar_handle");
 702             var handleHeight = handle.getBoundingClientRect().height;
 703             var controlbarBounds = document.getElementById("noVNC_control_bar")
 704                 .getBoundingClientRect();
 705             var margin = 10;
 706
 707             // These heights need to be non-zero for the below logic to work
 708             if (handleHeight === 0 || controlbarBounds.height === 0) {
 709                 return;
 710             }
 711
 712             var newY = viewportRelativeY;
 713
 714             // Check if the coordinates are outside the control bar
 715             if (newY < controlbarBounds.top + margin) {
 716                 // Force coordinates to be below the top of the control bar
 717                 newY = controlbarBounds.top + margin;
 718
 719             } else if (newY > controlbarBounds.top +
 720                        controlbarBounds.height - handleHeight - margin) {
 721                 // Force coordinates to be above the bottom of the control bar
 722                 newY = controlbarBounds.top +
 723                     controlbarBounds.height - handleHeight - margin;
 724             }
 725
 726             // Corner case: control bar too small for stable position
 727             if (controlbarBounds.height < (handleHeight + margin * 2)) {
 728                 newY = controlbarBounds.top +
 729                     (controlbarBounds.height - handleHeight) / 2;
 730             }
 731
 732             // The transform needs coordinates that are relative to the parent
 733             var parentRelativeY = newY - controlbarBounds.top;
 734             handle.style.transform = "translateY(" + parentRelativeY + "px)";
 735         },
 736
 737         updateControlbarHandle: function () {
 738             // Since the control bar is fixed on the viewport and not the page,
 739             // the move function expects coordinates relative the the viewport.
 740             var handle = document.getElementById("noVNC_control_bar_handle");
 741             var handleBounds = handle.getBoundingClientRect();
 742             UI.moveControlbarHandle(handleBounds.top);
 743         },
 744
 745         controlbarHandleMouseUp: function(e) {
 746             if ((e.type == "mouseup") && (e.button != 0)) return;
 747
 748             // mouseup and mousedown on the same place toggles the controlbar
 749             if (UI.controlbarGrabbed && !UI.controlbarDrag) {
 750                 UI.toggleControlbar();
 751                 e.preventDefault();
 752                 e.stopPropagation();
 753                 UI.keepControlbar();
 754                 UI.activateControlbar();
 755             }
 756             UI.controlbarGrabbed = false;
 757         },
 758
 759         controlbarHandleMouseDown: function(e) {
 760             if ((e.type == "mousedown") && (e.button != 0)) return;
 761
 762             var ptr = Util.getPointerEvent(e);
 763
 764             var handle = document.getElementById("noVNC_control_bar_handle");
 765             var bounds = handle.getBoundingClientRect();
 766
 767             Util.setCapture(handle);
 768             UI.controlbarGrabbed = true;
 769             UI.controlbarDrag = false;
 770
 771             UI.controlbarMouseDownClientY = ptr.clientY;
 772             UI.controlbarMouseDownOffsetY = ptr.clientY - bounds.top;
 773             e.preventDefault();
 774             e.stopPropagation();
 775             UI.keepControlbar();
 776             UI.activateControlbar();
 777         },
 778
 779         toggleExpander: function(e) {
 780             if (this.classList.contains("noVNC_open")) {
 781                 this.classList.remove("noVNC_open");
 782             } else {
 783                 this.classList.add("noVNC_open");
 784             }
 785         },
 786
 787 /* ------^-------
 788  *    /VISUAL
 789  * ==============
 790  *    SETTINGS
 791  * ------v------*/
 792
 793         // Initial page load read/initialization of settings
 794         initSetting: function(name, defVal) {
 795             // Check Query string followed by cookie
 796             var val = WebUtil.getConfigVar(name);
 797             if (val === null) {
 798                 val = WebUtil.readSetting(name, defVal);
 799             }
 800             UI.updateSetting(name, val);
 801             return val;
 802         },
 803
 804         // Update cookie and form control setting. If value is not set, then
 805         // updates from control to current cookie setting.
 806         updateSetting: function(name, value) {
 807
 808             // Save the cookie for this session
 809             if (typeof value !== 'undefined') {
 810                 WebUtil.writeSetting(name, value);
 811             }
 812
 813             // Update the settings control
 814             value = UI.getSetting(name);
 815
 816             var ctrl = document.getElementById('noVNC_setting_' + name);
 817             if (ctrl.type === 'checkbox') {
 818                 ctrl.checked = value;
 819
 820             } else if (typeof ctrl.options !== 'undefined') {
 821                 for (var i = 0; i < ctrl.options.length; i += 1) {
 822                     if (ctrl.options[i].value === value) {
 823                         ctrl.selectedIndex = i;
 824                         break;
 825                     }
 826                 }
 827             } else {
 828                 /*Weird IE9 error leads to 'null' appearring
 829                 in textboxes instead of ''.*/
 830                 if (value === null) {
 831                     value = "";
 832                 }
 833                 ctrl.value = value;
 834             }
 835         },
 836
 837         // Save control setting to cookie
 838         saveSetting: function(name) {
 839             var val, ctrl = document.getElementById('noVNC_setting_' + name);
 840             if (ctrl.type === 'checkbox') {
 841                 val = ctrl.checked;
 842             } else if (typeof ctrl.options !== 'undefined') {
 843                 val = ctrl.options[ctrl.selectedIndex].value;
 844             } else {
 845                 val = ctrl.value;
 846             }
 847             WebUtil.writeSetting(name, val);
 848             //Util.Debug("Setting saved '" + name + "=" + val + "'");
 849             return val;
 850         },
 851
 852         // Force a setting to be a certain value
 853         forceSetting: function(name, val) {
 854             UI.updateSetting(name, val);
 855             return val;
 856         },
 857
 858         // Read form control compatible setting from cookie
 859         getSetting: function(name) {
 860             var ctrl = document.getElementById('noVNC_setting_' + name);
 861             var val = WebUtil.readSetting(name);
 862             if (typeof val !== 'undefined' && val !== null && ctrl.type === 'checkbox') {
 863                 if (val.toString().toLowerCase() in {'0':1, 'no':1, 'false':1}) {
 864                     val = false;
 865                 } else {
 866                     val = true;
 867                 }
 868             }
 869             return val;
 870         },
 871
 872 /* ------^-------
 873  *   /SETTINGS
 874  * ==============
 875  *    PANELS
 876  * ------v------*/
 877
 878         closeAllPanels: function() {
 879             UI.closeSettingsPanel();
 880             UI.closeXvpPanel();
 881             UI.closeClipboardPanel();
 882             UI.closeExtraKeys();
 883         },
 884
 885 /* ------^-------
 886  *   /PANELS
 887  * ==============
 888  * SETTINGS (panel)
 889  * ------v------*/
 890
 891         openSettingsPanel: function() {
 892             UI.closeAllPanels();
 893             UI.openControlbar();
 894
 895             // Refresh UI elements from saved cookies
 896             UI.updateSetting('encrypt');
 897             UI.updateSetting('true_color');
 898             if (Util.browserSupportsCursorURIs()) {
 899                 UI.updateSetting('cursor');
 900             } else {
 901                 UI.updateSetting('cursor', !Util.isTouchDevice);
 902                 document.getElementById('noVNC_setting_cursor').disabled = true;
 903             }
 904             UI.updateSetting('clip');
 905             UI.updateSetting('resize');
 906             UI.updateSetting('shared');
 907             UI.updateSetting('view_only');
 908             UI.updateSetting('path');
 909             UI.updateSetting('repeaterID');
 910             UI.updateSetting('logging');
 911             UI.updateSetting('reconnect');
 912             UI.updateSetting('reconnect_delay');
 913
 914             document.getElementById('noVNC_settings')
 915                 .classList.add("noVNC_open");
 916             document.getElementById('noVNC_settings_button')
 917                 .classList.add("noVNC_selected");
 918         },
 919
 920         closeSettingsPanel: function() {
 921             document.getElementById('noVNC_settings')
 922                 .classList.remove("noVNC_open");
 923             document.getElementById('noVNC_settings_button')
 924                 .classList.remove("noVNC_selected");
 925         },
 926
 927         toggleSettingsPanel: function() {
 928             if (document.getElementById('noVNC_settings')
 929                 .classList.contains("noVNC_open")) {
 930                 UI.closeSettingsPanel();
 931             } else {
 932                 UI.openSettingsPanel();
 933             }
 934         },
 935
 936 /* ------^-------
 937  *   /SETTINGS
 938  * ==============
 939  *      XVP
 940  * ------v------*/
 941
 942         openXvpPanel: function() {
 943             UI.closeAllPanels();
 944             UI.openControlbar();
 945
 946             document.getElementById('noVNC_xvp')
 947                 .classList.add("noVNC_open");
 948             document.getElementById('noVNC_xvp_button')
 949                 .classList.add("noVNC_selected");
 950         },
 951
 952         closeXvpPanel: function() {
 953             document.getElementById('noVNC_xvp')
 954                 .classList.remove("noVNC_open");
 955             document.getElementById('noVNC_xvp_button')
 956                 .classList.remove("noVNC_selected");
 957         },
 958
 959         toggleXvpPanel: function() {
 960             if (document.getElementById('noVNC_xvp')
 961                 .classList.contains("noVNC_open")) {
 962                 UI.closeXvpPanel();
 963             } else {
 964                 UI.openXvpPanel();
 965             }
 966         },
 967
 968         // Disable/enable XVP button
 969         updateXvpButton: function(ver) {
 970             if (ver >= 1 && !UI.rfb.get_view_only()) {
 971                 document.getElementById('noVNC_xvp_button')
 972                     .classList.remove("noVNC_hidden");
 973             } else {
 974                 document.getElementById('noVNC_xvp_button')
 975                     .classList.add("noVNC_hidden");
 976                 // Close XVP panel if open
 977                 UI.closeXvpPanel();
 978             }
 979         },
 980
 981 /* ------^-------
 982  *     /XVP
 983  * ==============
 984  *   CLIPBOARD
 985  * ------v------*/
 986
 987         openClipboardPanel: function() {
 988             UI.closeAllPanels();
 989             UI.openControlbar();
 990
 991             document.getElementById('noVNC_clipboard')
 992                 .classList.add("noVNC_open");
 993             document.getElementById('noVNC_clipboard_button')
 994                 .classList.add("noVNC_selected");
 995         },
 996
 997         closeClipboardPanel: function() {
 998             document.getElementById('noVNC_clipboard')
 999                 .classList.remove("noVNC_open");
1000             document.getElementById('noVNC_clipboard_button')
1001                 .classList.remove("noVNC_selected");
1002         },
1003
1004         toggleClipboardPanel: function() {
1005             if (document.getElementById('noVNC_clipboard')
1006                 .classList.contains("noVNC_open")) {
1007                 UI.closeClipboardPanel();
1008             } else {
1009                 UI.openClipboardPanel();
1010             }
1011         },
1012
1013         clipboardReceive: function(rfb, text) {
1014             Util.Debug(">> UI.clipboardReceive: " + text.substr(0,40) + "...");
1015             document.getElementById('noVNC_clipboard_text').value = text;
1016             Util.Debug("<< UI.clipboardReceive");
1017         },
1018
1019         clipboardClear: function() {
1020             document.getElementById('noVNC_clipboard_text').value = "";
1021             UI.rfb.clipboardPasteFrom("");
1022         },
1023
1024         clipboardSend: function() {
1025             var text = document.getElementById('noVNC_clipboard_text').value;
1026             Util.Debug(">> UI.clipboardSend: " + text.substr(0,40) + "...");
1027             UI.rfb.clipboardPasteFrom(text);
1028             Util.Debug("<< UI.clipboardSend");
1029         },
1030
1031 /* ------^-------
1032  *  /CLIPBOARD
1033  * ==============
1034  *  CONNECTION
1035  * ------v------*/
1036
1037         openConnectPanel: function() {
1038             document.getElementById('noVNC_connect_dlg')
1039                 .classList.add("noVNC_open");
1040         },
1041
1042         closeConnectPanel: function() {
1043             document.getElementById('noVNC_connect_dlg')
1044                 .classList.remove("noVNC_open");
1045         },
1046
1047         connect: function(event, password) {
1048             var host = UI.getSetting('host');
1049             var port = UI.getSetting('port');
1050             var path = UI.getSetting('path');
1051
1052             if (typeof password === 'undefined') {
1053                 password = WebUtil.getConfigVar('password');
1054             }
1055
1056             if (password === null) {
1057                 password = undefined;
1058             }
1059
1060             if ((!host) || (!port)) {
1061                 var msg = _("Must set host and port");
1062                 Util.Error(msg);
1063                 UI.showStatus(msg, 'error');
1064                 return;
1065             }
1066
1067             if (!UI.initRFB()) return;
1068
1069             UI.closeAllPanels();
1070             UI.closeConnectPanel();
1071
1072             UI.rfb.set_encrypt(UI.getSetting('encrypt'));
1073             UI.rfb.set_true_color(UI.getSetting('true_color'));
1074             UI.rfb.set_local_cursor(UI.getSetting('cursor'));
1075             UI.rfb.set_shared(UI.getSetting('shared'));
1076             UI.rfb.set_view_only(UI.getSetting('view_only'));
1077             UI.rfb.set_repeaterID(UI.getSetting('repeaterID'));
1078
1079             UI.rfb.connect(host, port, password, path);
1080         },
1081
1082         disconnect: function() {
1083             UI.closeAllPanels();
1084             UI.rfb.disconnect();
1085
1086             // Disable automatic reconnecting
1087             UI.inhibit_reconnect = true;
1088
1089             // Restore the callback used for initial resize
1090             UI.rfb.set_onFBUComplete(UI.initialResize);
1091
1092             // Don't display the connection settings until we're actually disconnected
1093         },
1094
1095         reconnect: function() {
1096             UI.reconnect_callback = null;
1097
1098             // if reconnect has been disabled in the meantime, do nothing.
1099             if (UI.inhibit_reconnect) {
1100                 return;
1101             }
1102
1103             UI.connect(null, UI.reconnect_password);
1104         },
1105
1106         disconnectFinished: function (rfb, reason) {
1107             if (typeof reason !== 'undefined') {
1108                 UI.showStatus(reason, 'error');
1109             } else if (UI.getSetting('reconnect', false) === true && !UI.inhibit_reconnect) {
1110                 document.getElementById("noVNC_transition_text").textContent = _("Reconnecting...");
1111                 document.documentElement.classList.add("noVNC_reconnecting");
1112
1113                 var delay = parseInt(UI.getSetting('reconnect_delay'));
1114                 UI.reconnect_callback = setTimeout(UI.reconnect, delay);
1115                 return;
1116             }
1117
1118             UI.openControlbar();
1119             UI.openConnectPanel();
1120         },
1121
1122         cancelReconnect: function() {
1123             if (UI.reconnect_callback !== null) {
1124                 clearTimeout(UI.reconnect_callback);
1125                 UI.reconnect_callback = null;
1126             }
1127
1128             document.documentElement.classList.remove("noVNC_reconnecting");
1129             UI.openControlbar();
1130             UI.openConnectPanel();
1131         },
1132
1133 /* ------^-------
1134  *  /CONNECTION
1135  * ==============
1136  *   PASSWORD
1137  * ------v------*/
1138
1139         passwordRequired: function(rfb, msg) {
1140
1141             document.getElementById('noVNC_password_dlg')
1142                 .classList.add('noVNC_open');
1143
1144             setTimeout(function () {
1145                     document.getElementById('noVNC_password_input').focus();
1146                 }, 100);
1147
1148             if (typeof msg === 'undefined') {
1149                 msg = _("Password is required");
1150             }
1151             Util.Warn(msg);
1152             UI.showStatus(msg, "warning");
1153         },
1154
1155         setPassword: function(e) {
1156             var password = document.getElementById('noVNC_password_input').value;
1157             UI.rfb.sendPassword(password);
1158             UI.reconnect_password = password;
1159             document.getElementById('noVNC_password_dlg')
1160                 .classList.remove('noVNC_open');
1161             // Prevent actually submitting the form
1162             e.preventDefault();
1163         },
1164
1165 /* ------^-------
1166  *  /PASSWORD
1167  * ==============
1168  *   FULLSCREEN
1169  * ------v------*/
1170
1171         toggleFullscreen: function() {
1172             if (document.fullscreenElement || // alternative standard method
1173                 document.mozFullScreenElement || // currently working methods
1174                 document.webkitFullscreenElement ||
1175                 document.msFullscreenElement) {
1176                 if (document.exitFullscreen) {
1177                     document.exitFullscreen();
1178                 } else if (document.mozCancelFullScreen) {
1179                     document.mozCancelFullScreen();
1180                 } else if (document.webkitExitFullscreen) {
1181                     document.webkitExitFullscreen();
1182                 } else if (document.msExitFullscreen) {
1183                     document.msExitFullscreen();
1184                 }
1185             } else {
1186                 if (document.documentElement.requestFullscreen) {
1187                     document.documentElement.requestFullscreen();
1188                 } else if (document.documentElement.mozRequestFullScreen) {
1189                     document.documentElement.mozRequestFullScreen();
1190                 } else if (document.documentElement.webkitRequestFullscreen) {
1191                     document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
1192                 } else if (document.body.msRequestFullscreen) {
1193                     document.body.msRequestFullscreen();
1194                 }
1195             }
1196             UI.enableDisableViewClip();
1197             UI.updateFullscreenButton();
1198         },
1199
1200         updateFullscreenButton: function() {
1201             if (document.fullscreenElement || // alternative standard method
1202                 document.mozFullScreenElement || // currently working methods
1203                 document.webkitFullscreenElement ||
1204                 document.msFullscreenElement ) {
1205                 document.getElementById('noVNC_fullscreen_button')
1206                     .classList.add("noVNC_selected");
1207             } else {
1208                 document.getElementById('noVNC_fullscreen_button')
1209                     .classList.remove("noVNC_selected");
1210             }
1211         },
1212
1213 /* ------^-------
1214  *  /FULLSCREEN
1215  * ==============
1216  *     RESIZE
1217  * ------v------*/
1218
1219         // Apply remote resizing or local scaling
1220         applyResizeMode: function() {
1221             if (!UI.rfb) return;
1222
1223             var screen = UI.screenSize();
1224
1225             if (screen && UI.connected && UI.rfb.get_display()) {
1226
1227                 var display = UI.rfb.get_display();
1228                 var resizeMode = UI.getSetting('resize');
1229                 display.set_scale(1);
1230
1231                 if (resizeMode === 'remote') {
1232
1233                     // Request changing the resolution of the remote display to
1234                     // the size of the local browser viewport.
1235
1236                     // In order to not send multiple requests before the browser-resize
1237                     // is finished we wait 0.5 seconds before sending the request.
1238                     clearTimeout(UI.resizeTimeout);
1239                     UI.resizeTimeout = setTimeout(function(){
1240                         // Request a remote size covering the viewport
1241                         if (UI.rfb.requestDesktopSize(screen.w, screen.h)) {
1242                             Util.Debug('Requested new desktop size: ' +
1243                                        screen.w + 'x' + screen.h);
1244                         }
1245                     }, 500);
1246
1247                 } else if (resizeMode === 'scale' || resizeMode === 'downscale') {
1248                     var downscaleOnly = resizeMode === 'downscale';
1249                     display.autoscale(screen.w, screen.h, downscaleOnly);
1250                 }
1251             }
1252         },
1253
1254         // Gets the the size of the available viewport in the browser window
1255         screenSize: function() {
1256             var screen = document.getElementById('noVNC_screen');
1257             var width, height;
1258
1259             screen.style.overflow = "hidden";
1260
1261             width = screen.offsetWidth;
1262             height = screen.offsetHeight;
1263
1264             screen.style.overflow = "auto";
1265
1266             return {w: width, h: height};
1267         },
1268
1269         // Normally we only apply the current resize mode after a window resize
1270         // event. This means that when a new connection is opened, there is no
1271         // resize mode active.
1272         // We have to wait until the first FBU because this is where the client
1273         // will find the supported encodings of the server. Some calls later in
1274         // the chain is dependant on knowing the server-capabilities.
1275         initialResize: function(rfb, fbu) {
1276             UI.applyResizeMode();
1277             // After doing this once, we remove the callback.
1278             UI.rfb.set_onFBUComplete(function() { });
1279         },
1280
1281 /* ------^-------
1282  *    /RESIZE
1283  * ==============
1284  *    CLIPPING
1285  * ------v------*/
1286
1287         // Set and configure viewport clipping
1288         setViewClip: function(clip) {
1289             UI.updateSetting('clip', clip);
1290             UI.updateViewClip();
1291         },
1292
1293         // Update parameters that depend on the clip setting
1294         updateViewClip: function() {
1295             if (!UI.rfb) return;
1296
1297             var display = UI.rfb.get_display();
1298             var cur_clip = display.get_viewport();
1299             var new_clip = UI.getSetting('clip');
1300
1301             if (cur_clip !== new_clip) {
1302                 display.set_viewport(new_clip);
1303             }
1304
1305             var size = UI.screenSize();
1306
1307             if (new_clip && size) {
1308                 // When clipping is enabled, the screen is limited to
1309                 // the size of the browser window.
1310                 display.viewportChangeSize(size.w, size.h);
1311             }
1312         },
1313
1314         // Handle special cases where clipping is forced on/off or locked
1315         enableDisableViewClip: function() {
1316             var resizeSetting = UI.getSetting('resize');
1317
1318             if (resizeSetting === 'downscale' || resizeSetting === 'scale') {
1319                 // Disable clipping if we are scaling
1320                 UI.forceSetting('clip', false);
1321                 UI.setViewClip(false);
1322                 document.getElementById('noVNC_setting_clip').disabled = true;
1323             } else {
1324                 document.getElementById('noVNC_setting_clip').disabled =
1325                     UI.connected || Util.isTouchDevice;
1326                 if (Util.isTouchDevice) {
1327                     UI.setViewClip(true);
1328                 }
1329             }
1330         },
1331
1332 /* ------^-------
1333  *   /CLIPPING
1334  * ==============
1335  *    VIEWDRAG
1336  * ------v------*/
1337
1338         toggleViewDrag: function() {
1339             if (!UI.rfb) return;
1340
1341             var drag = UI.rfb.get_viewportDrag();
1342             UI.setViewDrag(!drag);
1343          },
1344
1345         // Set the view drag mode which moves the viewport on mouse drags
1346         setViewDrag: function(drag) {
1347             if (!UI.rfb) return;
1348
1349             UI.rfb.set_viewportDrag(drag);
1350
1351             UI.updateViewDrag();
1352         },
1353
1354         updateViewDrag: function() {
1355             var clipping = false;
1356
1357             if (!UI.connected) return;
1358
1359             // Check if viewport drag is possible. It is only possible
1360             // if the remote display is clipping the client display.
1361             if (UI.rfb.get_display().get_viewport() &&
1362                 UI.rfb.get_display().clippingDisplay()) {
1363                 clipping = true;
1364             }
1365
1366             var viewDragButton = document.getElementById('noVNC_view_drag_button');
1367
1368             if (!clipping &&
1369                 UI.rfb.get_viewportDrag()) {
1370                 // The size of the remote display is the same or smaller
1371                 // than the client display. Make sure viewport drag isn't
1372                 // active when it can't be used.
1373                 UI.rfb.set_viewportDrag(false);
1374             }
1375
1376             if (UI.rfb.get_viewportDrag()) {
1377                 viewDragButton.classList.add("noVNC_selected");
1378             } else {
1379                 viewDragButton.classList.remove("noVNC_selected");
1380             }
1381
1382             // Different behaviour for touch vs non-touch
1383             // The button is disabled instead of hidden on touch devices
1384             if (Util.isTouchDevice) {
1385                 viewDragButton.classList.remove("noVNC_hidden");
1386
1387                 if (clipping) {
1388                     viewDragButton.disabled = false;
1389                 } else {
1390                     viewDragButton.disabled = true;
1391                 }
1392             } else {
1393                 viewDragButton.disabled = false;
1394
1395                 if (clipping) {
1396                     viewDragButton.classList.remove("noVNC_hidden");
1397                 } else {
1398                     viewDragButton.classList.add("noVNC_hidden");
1399                 }
1400             }
1401         },
1402
1403 /* ------^-------
1404  *   /VIEWDRAG
1405  * ==============
1406  *    KEYBOARD
1407  * ------v------*/
1408
1409         showVirtualKeyboard: function() {
1410             if (!Util.isTouchDevice) return;
1411
1412             var input = document.getElementById('noVNC_keyboardinput');
1413
1414             if (document.activeElement == input) return;
1415
1416             input.focus();
1417
1418             try {
1419                 var l = input.value.length;
1420                 // Move the caret to the end
1421                 input.setSelectionRange(l, l);
1422             } catch (err) {} // setSelectionRange is undefined in Google Chrome
1423         },
1424
1425         hideVirtualKeyboard: function() {
1426             if (!Util.isTouchDevice) return;
1427
1428             var input = document.getElementById('noVNC_keyboardinput');
1429
1430             if (document.activeElement != input) return;
1431
1432             input.blur();
1433         },
1434
1435         toggleVirtualKeyboard: function () {
1436             if (document.getElementById('noVNC_keyboard_button')
1437                 .classList.contains("noVNC_selected")) {
1438                 UI.hideVirtualKeyboard();
1439             } else {
1440                 UI.showVirtualKeyboard();
1441             }
1442         },
1443
1444         onfocusVirtualKeyboard: function(event) {
1445             document.getElementById('noVNC_keyboard_button')
1446                 .classList.add("noVNC_selected");
1447         },
1448
1449         onblurVirtualKeyboard: function(event) {
1450             document.getElementById('noVNC_keyboard_button')
1451                 .classList.remove("noVNC_selected");
1452         },
1453
1454         keepVirtualKeyboard: function(event) {
1455             var input = document.getElementById('noVNC_keyboardinput');
1456
1457             // Only prevent focus change if the virtual keyboard is active
1458             if (document.activeElement != input) {
1459                 return;
1460             }
1461
1462             // Only allow focus to move to other elements that need
1463             // focus to function properly
1464             if (event.target.form !== undefined) {
1465                 switch (event.target.type) {
1466                     case 'text':
1467                     case 'email':
1468                     case 'search':
1469                     case 'password':
1470                     case 'tel':
1471                     case 'url':
1472                     case 'textarea':
1473                     case 'select-one':
1474                     case 'select-multiple':
1475                         return;
1476                 }
1477             }
1478
1479             event.preventDefault();
1480         },
1481
1482         keyboardinputReset: function() {
1483             var kbi = document.getElementById('noVNC_keyboardinput');
1484             kbi.value = new Array(UI.defaultKeyboardinputLen).join("_");
1485             UI.lastKeyboardinput = kbi.value;
1486         },
1487
1488         // When normal keyboard events are left uncought, use the input events from
1489         // the keyboardinput element instead and generate the corresponding key events.
1490         // This code is required since some browsers on Android are inconsistent in
1491         // sending keyCodes in the normal keyboard events when using on screen keyboards.
1492         keyInput: function(event) {
1493
1494             if (!UI.rfb) return;
1495
1496             var newValue = event.target.value;
1497
1498             if (!UI.lastKeyboardinput) {
1499                 UI.keyboardinputReset();
1500             }
1501             var oldValue = UI.lastKeyboardinput;
1502
1503             var newLen;
1504             try {
1505                 // Try to check caret position since whitespace at the end
1506                 // will not be considered by value.length in some browsers
1507                 newLen = Math.max(event.target.selectionStart, newValue.length);
1508             } catch (err) {
1509                 // selectionStart is undefined in Google Chrome
1510                 newLen = newValue.length;
1511             }
1512             var oldLen = oldValue.length;
1513
1514             var backspaces;
1515             var inputs = newLen - oldLen;
1516             if (inputs < 0) {
1517                 backspaces = -inputs;
1518             } else {
1519                 backspaces = 0;
1520             }
1521
1522             // Compare the old string with the new to account for
1523             // text-corrections or other input that modify existing text
1524             var i;
1525             for (i = 0; i < Math.min(oldLen, newLen); i++) {
1526                 if (newValue.charAt(i) != oldValue.charAt(i)) {
1527                     inputs = newLen - i;
1528                     backspaces = oldLen - i;
1529                     break;
1530                 }
1531             }
1532
1533             // Send the key events
1534             for (i = 0; i < backspaces; i++) {
1535                 UI.rfb.sendKey(KeyTable.XK_BackSpace);
1536             }
1537             for (i = newLen - inputs; i < newLen; i++) {
1538                 UI.rfb.sendKey(keysyms.fromUnicode(newValue.charCodeAt(i)).keysym);
1539             }
1540
1541             // Control the text content length in the keyboardinput element
1542             if (newLen > 2 * UI.defaultKeyboardinputLen) {
1543                 UI.keyboardinputReset();
1544             } else if (newLen < 1) {
1545                 // There always have to be some text in the keyboardinput
1546                 // element with which backspace can interact.
1547                 UI.keyboardinputReset();
1548                 // This sometimes causes the keyboard to disappear for a second
1549                 // but it is required for the android keyboard to recognize that
1550                 // text has been added to the field
1551                 event.target.blur();
1552                 // This has to be ran outside of the input handler in order to work
1553                 setTimeout(event.target.focus.bind(event.target), 0);
1554             } else {
1555                 UI.lastKeyboardinput = newValue;
1556             }
1557         },
1558
1559 /* ------^-------
1560  *   /KEYBOARD
1561  * ==============
1562  *   EXTRA KEYS
1563  * ------v------*/
1564
1565         openExtraKeys: function() {
1566             UI.closeAllPanels();
1567             UI.openControlbar();
1568
1569             document.getElementById('noVNC_modifiers')
1570                 .classList.add("noVNC_open");
1571             document.getElementById('noVNC_toggle_extra_keys_button')
1572                 .classList.add("noVNC_selected");
1573         },
1574
1575         closeExtraKeys: function() {
1576             document.getElementById('noVNC_modifiers')
1577                 .classList.remove("noVNC_open");
1578             document.getElementById('noVNC_toggle_extra_keys_button')
1579                 .classList.remove("noVNC_selected");
1580         },
1581
1582         toggleExtraKeys: function() {
1583             if(document.getElementById('noVNC_modifiers')
1584                 .classList.contains("noVNC_open")) {
1585                 UI.closeExtraKeys();
1586             } else  {
1587                 UI.openExtraKeys();
1588             }
1589         },
1590
1591         sendEsc: function() {
1592             UI.rfb.sendKey(KeyTable.XK_Escape);
1593         },
1594
1595         sendTab: function() {
1596             UI.rfb.sendKey(KeyTable.XK_Tab);
1597         },
1598
1599         toggleCtrl: function() {
1600             var btn = document.getElementById('noVNC_toggle_ctrl_button');
1601             if (btn.classList.contains("noVNC_selected")) {
1602                 UI.rfb.sendKey(KeyTable.XK_Control_L, false);
1603                 btn.classList.remove("noVNC_selected");
1604             } else {
1605                 UI.rfb.sendKey(KeyTable.XK_Control_L, true);
1606                 btn.classList.add("noVNC_selected");
1607             }
1608         },
1609
1610         toggleAlt: function() {
1611             var btn = document.getElementById('noVNC_toggle_alt_button');
1612             if (btn.classList.contains("noVNC_selected")) {
1613                 UI.rfb.sendKey(KeyTable.XK_Alt_L, false);
1614                 btn.classList.remove("noVNC_selected");
1615             } else {
1616                 UI.rfb.sendKey(KeyTable.XK_Alt_L, true);
1617                 btn.classList.add("noVNC_selected");
1618             }
1619         },
1620
1621         sendCtrlAltDel: function() {
1622             UI.rfb.sendCtrlAltDel();
1623         },
1624
1625 /* ------^-------
1626  *   /EXTRA KEYS
1627  * ==============
1628  *     MISC
1629  * ------v------*/
1630
1631         setMouseButton: function(num) {
1632             var view_only = UI.rfb.get_view_only();
1633             if (UI.rfb && !view_only) {
1634                 UI.rfb.get_mouse().set_touchButton(num);
1635             }
1636
1637             var blist = [0, 1,2,4];
1638             for (var b = 0; b < blist.length; b++) {
1639                 var button = document.getElementById('noVNC_mouse_button' +
1640                                                      blist[b]);
1641                 if (blist[b] === num && !view_only) {
1642                     button.classList.remove("noVNC_hidden");
1643                 } else {
1644                     button.classList.add("noVNC_hidden");
1645                 }
1646             }
1647         },
1648
1649         displayBlur: function() {
1650             if (UI.rfb && !UI.rfb.get_view_only()) {
1651                 UI.rfb.get_keyboard().set_focused(false);
1652                 UI.rfb.get_mouse().set_focused(false);
1653             }
1654         },
1655
1656         displayFocus: function() {
1657             if (UI.rfb && !UI.rfb.get_view_only()) {
1658                 UI.rfb.get_keyboard().set_focused(true);
1659                 UI.rfb.get_mouse().set_focused(true);
1660             }
1661         },
1662
1663         updateLogging: function() {
1664             WebUtil.init_logging(UI.getSetting('logging'));
1665         },
1666
1667         updateSessionSize: function(rfb, width, height) {
1668             UI.updateViewClip();
1669             UI.updateViewDrag();
1670         },
1671
1672         updateDesktopName: function(rfb, name) {
1673             UI.desktopName = name;
1674             // Display the desktop name in the document title
1675             document.title = name + " - noVNC";
1676         },
1677
1678         bell: function(rfb) {
1679             if (WebUtil.getConfigVar('bell', 'on') === 'on') {
1680                 document.getElementById('noVNC_bell').play();
1681             }
1682         },
1683
1684         //Helper to add options to dropdown.
1685         addOption: function(selectbox, text, value) {
1686             var optn = document.createElement("OPTION");
1687             optn.text = text;
1688             optn.value = value;
1689             selectbox.options.add(optn);
1690         },
1691
1692 /* ------^-------
1693  *    /MISC
1694  * ==============
1695  */
1696     };
1697
1698     /* [module] UI.load(); */
1699 })();
1700
1701 /* [module] export default UI; */