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('clip');
 425             UI.addSettingChangeHandler('shared');
 426             UI.addSettingChangeHandler('view_only');
 427             UI.addSettingChangeHandler('host');
 428             UI.addSettingChangeHandler('port');
 429             UI.addSettingChangeHandler('path');
 430             UI.addSettingChangeHandler('repeaterID');
 431             UI.addSettingChangeHandler('logging');
 432             UI.addSettingChangeHandler('logging', UI.updateLogging);
 433             UI.addSettingChangeHandler('reconnect');
 434             UI.addSettingChangeHandler('reconnect_delay');
 435         },
 436
 437         addFullscreenHandlers: function() {
 438             document.getElementById("noVNC_fullscreen_button")
 439                 .addEventListener('click', UI.toggleFullscreen);
 440
 441             window.addEventListener('fullscreenchange', UI.updateFullscreenButton);
 442             window.addEventListener('mozfullscreenchange', UI.updateFullscreenButton);
 443             window.addEventListener('webkitfullscreenchange', UI.updateFullscreenButton);
 444             window.addEventListener('msfullscreenchange', UI.updateFullscreenButton);
 445         },
 446
 447 /* ------^-------
 448  * /EVENT HANDLERS
 449  * ==============
 450  *     VISUAL
 451  * ------v------*/
 452
 453         updateState: function(rfb, state, oldstate) {
 454             var msg;
 455
 456             document.documentElement.classList.remove("noVNC_connecting");
 457             document.documentElement.classList.remove("noVNC_connected");
 458             document.documentElement.classList.remove("noVNC_disconnecting");
 459             document.documentElement.classList.remove("noVNC_reconnecting");
 460
 461             switch (state) {
 462                 case 'connecting':
 463                     document.getElementById("noVNC_transition_text").textContent = _("Connecting...");
 464                     document.documentElement.classList.add("noVNC_connecting");
 465                     break;
 466                 case 'connected':
 467                     UI.connected = true;
 468                     UI.inhibit_reconnect = false;
 469                     document.documentElement.classList.add("noVNC_connected");
 470                     if (rfb && rfb.get_encrypt()) {
 471                         msg = _("Connected (encrypted) to ") + UI.desktopName;
 472                     } else {
 473                         msg = _("Connected (unencrypted) to ") + UI.desktopName;
 474                     }
 475                     UI.showStatus(msg);
 476                     break;
 477                 case 'disconnecting':
 478                     UI.connected = false;
 479                     document.getElementById("noVNC_transition_text").textContent = _("Disconnecting...");
 480                     document.documentElement.classList.add("noVNC_disconnecting");
 481                     break;
 482                 case 'disconnected':
 483                     UI.showStatus(_("Disconnected"));
 484                     break;
 485                 default:
 486                     msg = "Invalid UI state";
 487                     Util.Error(msg);
 488                     UI.showStatus(msg, 'error');
 489                     break;
 490             }
 491
 492             UI.updateVisualState();
 493         },
 494
 495         // Disable/enable controls depending on connection state
 496         updateVisualState: function() {
 497             //Util.Debug(">> updateVisualState");
 498             document.getElementById('noVNC_setting_encrypt').disabled = UI.connected;
 499             document.getElementById('noVNC_setting_true_color').disabled = UI.connected;
 500             if (Util.browserSupportsCursorURIs()) {
 501                 document.getElementById('noVNC_setting_cursor').disabled = UI.connected;
 502             } else {
 503                 UI.updateSetting('cursor', !Util.isTouchDevice);
 504                 document.getElementById('noVNC_setting_cursor').disabled = true;
 505             }
 506
 507             UI.enableDisableViewClip();
 508             document.getElementById('noVNC_setting_resize').disabled = UI.connected;
 509             document.getElementById('noVNC_setting_shared').disabled = UI.connected;
 510             document.getElementById('noVNC_setting_view_only').disabled = UI.connected;
 511             document.getElementById('noVNC_setting_host').disabled = UI.connected;
 512             document.getElementById('noVNC_setting_port').disabled = UI.connected;
 513             document.getElementById('noVNC_setting_path').disabled = UI.connected;
 514             document.getElementById('noVNC_setting_repeaterID').disabled = UI.connected;
 515             document.getElementById('noVNC_setting_reconnect').disabled = UI.connected;
 516             document.getElementById('noVNC_setting_reconnect_delay').disabled = UI.connected;
 517
 518             if (UI.connected) {
 519                 UI.updateViewClip();
 520                 UI.setMouseButton(1);
 521
 522                 // Hide the controlbar after 2 seconds
 523                 UI.closeControlbarTimeout = setTimeout(UI.closeControlbar, 2000);
 524             } else {
 525                 UI.updateXvpButton(0);
 526                 UI.keepControlbar();
 527             }
 528
 529             // Hide input related buttons in view only mode
 530             if (UI.rfb && UI.rfb.get_view_only()) {
 531                 document.getElementById('noVNC_keyboard_button')
 532                     .classList.add('noVNC_hidden');
 533                 document.getElementById('noVNC_toggle_extra_keys_button')
 534                     .classList.add('noVNC_hidden');
 535             } else {
 536                 document.getElementById('noVNC_keyboard_button')
 537                     .classList.remove('noVNC_hidden');
 538                 document.getElementById('noVNC_toggle_extra_keys_button')
 539                     .classList.remove('noVNC_hidden');
 540             }
 541
 542             // State change disables viewport dragging.
 543             // It is enabled (toggled) by direct click on the button
 544             UI.setViewDrag(false);
 545
 546             // State change also closes the password dialog
 547             document.getElementById('noVNC_password_dlg')
 548                 .classList.remove('noVNC_open');
 549
 550             //Util.Debug("<< updateVisualState");
 551         },
 552
 553         showStatus: function(text, status_type, time) {
 554             var statusElem = document.getElementById('noVNC_status');
 555
 556             clearTimeout(UI.statusTimeout);
 557
 558             if (typeof status_type === 'undefined') {
 559                 status_type = 'normal';
 560             }
 561
 562             statusElem.classList.remove("noVNC_status_normal",
 563                                         "noVNC_status_warn",
 564                                         "noVNC_status_error");
 565
 566             switch (status_type) {
 567                 case 'warning':
 568                 case 'warn':
 569                     statusElem.classList.add("noVNC_status_warn");
 570                     break;
 571                 case 'error':
 572                     statusElem.classList.add("noVNC_status_error");
 573                     break;
 574                 case 'normal':
 575                 case 'info':
 576                 default:
 577                     statusElem.classList.add("noVNC_status_normal");
 578                     break;
 579             }
 580
 581             statusElem.textContent = text;
 582             statusElem.classList.add("noVNC_open");
 583
 584             // If no time was specified, show the status for 1.5 seconds
 585             if (typeof time === 'undefined') {
 586                 time = 1500;
 587             }
 588
 589             // Error messages do not timeout
 590             if (status_type !== 'error') {
 591                 UI.statusTimeout = window.setTimeout(UI.hideStatus, time);
 592             }
 593         },
 594
 595         hideStatus: function() {
 596             clearTimeout(UI.statusTimeout);
 597             document.getElementById('noVNC_status').classList.remove("noVNC_open");
 598         },
 599
 600         notification: function (rfb, msg, level, options) {
 601             UI.showStatus(msg, level);
 602         },
 603
 604         activateControlbar: function(event) {
 605             clearTimeout(UI.idleControlbarTimeout);
 606             // We manipulate the anchor instead of the actual control
 607             // bar in order to avoid creating new a stacking group
 608             document.getElementById('noVNC_control_bar_anchor')
 609                 .classList.remove("noVNC_idle");
 610             UI.idleControlbarTimeout = window.setTimeout(UI.idleControlbar, 2000);
 611         },
 612
 613         idleControlbar: function() {
 614             document.getElementById('noVNC_control_bar_anchor')
 615                 .classList.add("noVNC_idle");
 616         },
 617
 618         keepControlbar: function() {
 619             clearTimeout(UI.closeControlbarTimeout);
 620         },
 621
 622         openControlbar: function() {
 623             document.getElementById('noVNC_control_bar')
 624                 .classList.add("noVNC_open");
 625         },
 626
 627         closeControlbar: function() {
 628             UI.closeAllPanels();
 629             document.getElementById('noVNC_control_bar')
 630                 .classList.remove("noVNC_open");
 631         },
 632
 633         toggleControlbar: function() {
 634             if (document.getElementById('noVNC_control_bar')
 635                 .classList.contains("noVNC_open")) {
 636                 UI.closeControlbar();
 637             } else {
 638                 UI.openControlbar();
 639             }
 640         },
 641
 642         toggleControlbarSide: function () {
 643             // Temporarily disable animation to avoid weird movement
 644             var bar = document.getElementById('noVNC_control_bar');
 645             bar.style.transitionDuration = '0s';
 646             bar.addEventListener('transitionend', function () { this.style.transitionDuration = ""; });
 647
 648             var anchor = document.getElementById('noVNC_control_bar_anchor');
 649             if (anchor.classList.contains("noVNC_right")) {
 650                 WebUtil.writeSetting('controlbar_pos', 'left');
 651                 anchor.classList.remove("noVNC_right");
 652             } else {
 653                 WebUtil.writeSetting('controlbar_pos', 'right');
 654                 anchor.classList.add("noVNC_right");
 655             }
 656
 657             // Consider this a movement of the handle
 658             UI.controlbarDrag = true;
 659         },
 660
 661         dragControlbarHandle: function (e) {
 662             if (!UI.controlbarGrabbed) return;
 663
 664             var ptr = Util.getPointerEvent(e);
 665
 666             var anchor = document.getElementById('noVNC_control_bar_anchor');
 667             if (ptr.clientX < (window.innerWidth * 0.1)) {
 668                 if (anchor.classList.contains("noVNC_right")) {
 669                     UI.toggleControlbarSide();
 670                 }
 671             } else if (ptr.clientX > (window.innerWidth * 0.9)) {
 672                 if (!anchor.classList.contains("noVNC_right")) {
 673                     UI.toggleControlbarSide();
 674                 }
 675             }
 676
 677             if (!UI.controlbarDrag) {
 678                 // The goal is to trigger on a certain physical width, the
 679                 // devicePixelRatio brings us a bit closer but is not optimal.
 680                 var dragThreshold = 10 * (window.devicePixelRatio || 1);
 681                 var dragDistance = Math.abs(ptr.clientY - UI.controlbarMouseDownClientY);
 682
 683                 if (dragDistance < dragThreshold) return;
 684
 685                 UI.controlbarDrag = true;
 686             }
 687
 688             var eventY = ptr.clientY - UI.controlbarMouseDownOffsetY;
 689
 690             UI.moveControlbarHandle(eventY);
 691
 692             e.preventDefault();
 693             e.stopPropagation();
 694             UI.keepControlbar();
 695             UI.activateControlbar();
 696         },
 697
 698         // Move the handle but don't allow any position outside the bounds
 699         moveControlbarHandle: function (viewportRelativeY) {
 700             var handle = document.getElementById("noVNC_control_bar_handle");
 701             var handleHeight = handle.getBoundingClientRect().height;
 702             var controlbarBounds = document.getElementById("noVNC_control_bar")
 703                 .getBoundingClientRect();
 704             var margin = 10;
 705
 706             // These heights need to be non-zero for the below logic to work
 707             if (handleHeight === 0 || controlbarBounds.height === 0) {
 708                 return;
 709             }
 710
 711             var newY = viewportRelativeY;
 712
 713             // Check if the coordinates are outside the control bar
 714             if (newY < controlbarBounds.top + margin) {
 715                 // Force coordinates to be below the top of the control bar
 716                 newY = controlbarBounds.top + margin;
 717
 718             } else if (newY > controlbarBounds.top +
 719                        controlbarBounds.height - handleHeight - margin) {
 720                 // Force coordinates to be above the bottom of the control bar
 721                 newY = controlbarBounds.top +
 722                     controlbarBounds.height - handleHeight - margin;
 723             }
 724
 725             // Corner case: control bar too small for stable position
 726             if (controlbarBounds.height < (handleHeight + margin * 2)) {
 727                 newY = controlbarBounds.top +
 728                     (controlbarBounds.height - handleHeight) / 2;
 729             }
 730
 731             // The transform needs coordinates that are relative to the parent
 732             var parentRelativeY = newY - controlbarBounds.top;
 733             handle.style.transform = "translateY(" + parentRelativeY + "px)";
 734         },
 735
 736         updateControlbarHandle: function () {
 737             // Since the control bar is fixed on the viewport and not the page,
 738             // the move function expects coordinates relative the the viewport.
 739             var handle = document.getElementById("noVNC_control_bar_handle");
 740             var handleBounds = handle.getBoundingClientRect();
 741             UI.moveControlbarHandle(handleBounds.top);
 742         },
 743
 744         controlbarHandleMouseUp: function(e) {
 745             if ((e.type == "mouseup") && (e.button != 0)) return;
 746
 747             // mouseup and mousedown on the same place toggles the controlbar
 748             if (UI.controlbarGrabbed && !UI.controlbarDrag) {
 749                 UI.toggleControlbar();
 750                 e.preventDefault();
 751                 e.stopPropagation();
 752                 UI.keepControlbar();
 753                 UI.activateControlbar();
 754             }
 755             UI.controlbarGrabbed = false;
 756         },
 757
 758         controlbarHandleMouseDown: function(e) {
 759             if ((e.type == "mousedown") && (e.button != 0)) return;
 760
 761             var ptr = Util.getPointerEvent(e);
 762
 763             var handle = document.getElementById("noVNC_control_bar_handle");
 764             var bounds = handle.getBoundingClientRect();
 765
 766             WebUtil.setCapture(handle);
 767             UI.controlbarGrabbed = true;
 768             UI.controlbarDrag = false;
 769
 770             UI.controlbarMouseDownClientY = ptr.clientY;
 771             UI.controlbarMouseDownOffsetY = ptr.clientY - bounds.top;
 772             e.preventDefault();
 773             e.stopPropagation();
 774             UI.keepControlbar();
 775             UI.activateControlbar();
 776         },
 777
 778         toggleExpander: function(e) {
 779             if (this.classList.contains("noVNC_open")) {
 780                 this.classList.remove("noVNC_open");
 781             } else {
 782                 this.classList.add("noVNC_open");
 783             }
 784         },
 785
 786 /* ------^-------
 787  *    /VISUAL
 788  * ==============
 789  *    SETTINGS
 790  * ------v------*/
 791
 792         // Initial page load read/initialization of settings
 793         initSetting: function(name, defVal) {
 794             // Check Query string followed by cookie
 795             var val = WebUtil.getConfigVar(name);
 796             if (val === null) {
 797                 val = WebUtil.readSetting(name, defVal);
 798             }
 799             UI.updateSetting(name, val);
 800             return val;
 801         },
 802
 803         // Update cookie and form control setting. If value is not set, then
 804         // updates from control to current cookie setting.
 805         updateSetting: function(name, value) {
 806
 807             // Save the cookie for this session
 808             if (typeof value !== 'undefined') {
 809                 WebUtil.writeSetting(name, value);
 810             }
 811
 812             // Update the settings control
 813             value = UI.getSetting(name);
 814
 815             var ctrl = document.getElementById('noVNC_setting_' + name);
 816             if (ctrl.type === 'checkbox') {
 817                 ctrl.checked = value;
 818
 819             } else if (typeof ctrl.options !== 'undefined') {
 820                 for (var i = 0; i < ctrl.options.length; i += 1) {
 821                     if (ctrl.options[i].value === value) {
 822                         ctrl.selectedIndex = i;
 823                         break;
 824                     }
 825                 }
 826             } else {
 827                 /*Weird IE9 error leads to 'null' appearring
 828                 in textboxes instead of ''.*/
 829                 if (value === null) {
 830                     value = "";
 831                 }
 832                 ctrl.value = value;
 833             }
 834         },
 835
 836         // Save control setting to cookie
 837         saveSetting: function(name) {
 838             var val, ctrl = document.getElementById('noVNC_setting_' + name);
 839             if (ctrl.type === 'checkbox') {
 840                 val = ctrl.checked;
 841             } else if (typeof ctrl.options !== 'undefined') {
 842                 val = ctrl.options[ctrl.selectedIndex].value;
 843             } else {
 844                 val = ctrl.value;
 845             }
 846             WebUtil.writeSetting(name, val);
 847             //Util.Debug("Setting saved '" + name + "=" + val + "'");
 848             return val;
 849         },
 850
 851         // Force a setting to be a certain value
 852         forceSetting: function(name, val) {
 853             UI.updateSetting(name, val);
 854             return val;
 855         },
 856
 857         // Read form control compatible setting from cookie
 858         getSetting: function(name) {
 859             var ctrl = document.getElementById('noVNC_setting_' + name);
 860             var val = WebUtil.readSetting(name);
 861             if (typeof val !== 'undefined' && val !== null && ctrl.type === 'checkbox') {
 862                 if (val.toString().toLowerCase() in {'0':1, 'no':1, 'false':1}) {
 863                     val = false;
 864                 } else {
 865                     val = true;
 866                 }
 867             }
 868             return val;
 869         },
 870
 871 /* ------^-------
 872  *   /SETTINGS
 873  * ==============
 874  *    PANELS
 875  * ------v------*/
 876
 877         closeAllPanels: function() {
 878             UI.closeSettingsPanel();
 879             UI.closeXvpPanel();
 880             UI.closeClipboardPanel();
 881             UI.closeExtraKeys();
 882         },
 883
 884 /* ------^-------
 885  *   /PANELS
 886  * ==============
 887  * SETTINGS (panel)
 888  * ------v------*/
 889
 890         openSettingsPanel: function() {
 891             UI.closeAllPanels();
 892             UI.openControlbar();
 893
 894             // Refresh UI elements from saved cookies
 895             UI.updateSetting('encrypt');
 896             UI.updateSetting('true_color');
 897             if (Util.browserSupportsCursorURIs()) {
 898                 UI.updateSetting('cursor');
 899             } else {
 900                 UI.updateSetting('cursor', !Util.isTouchDevice);
 901                 document.getElementById('noVNC_setting_cursor').disabled = true;
 902             }
 903             UI.updateSetting('clip');
 904             UI.updateSetting('resize');
 905             UI.updateSetting('shared');
 906             UI.updateSetting('view_only');
 907             UI.updateSetting('path');
 908             UI.updateSetting('repeaterID');
 909             UI.updateSetting('logging');
 910             UI.updateSetting('reconnect');
 911             UI.updateSetting('reconnect_delay');
 912
 913             document.getElementById('noVNC_settings')
 914                 .classList.add("noVNC_open");
 915             document.getElementById('noVNC_settings_button')
 916                 .classList.add("noVNC_selected");
 917         },
 918
 919         closeSettingsPanel: function() {
 920             document.getElementById('noVNC_settings')
 921                 .classList.remove("noVNC_open");
 922             document.getElementById('noVNC_settings_button')
 923                 .classList.remove("noVNC_selected");
 924         },
 925
 926         toggleSettingsPanel: function() {
 927             if (document.getElementById('noVNC_settings')
 928                 .classList.contains("noVNC_open")) {
 929                 UI.closeSettingsPanel();
 930             } else {
 931                 UI.openSettingsPanel();
 932             }
 933         },
 934
 935 /* ------^-------
 936  *   /SETTINGS
 937  * ==============
 938  *      XVP
 939  * ------v------*/
 940
 941         openXvpPanel: function() {
 942             UI.closeAllPanels();
 943             UI.openControlbar();
 944
 945             document.getElementById('noVNC_xvp')
 946                 .classList.add("noVNC_open");
 947             document.getElementById('noVNC_xvp_button')
 948                 .classList.add("noVNC_selected");
 949         },
 950
 951         closeXvpPanel: function() {
 952             document.getElementById('noVNC_xvp')
 953                 .classList.remove("noVNC_open");
 954             document.getElementById('noVNC_xvp_button')
 955                 .classList.remove("noVNC_selected");
 956         },
 957
 958         toggleXvpPanel: function() {
 959             if (document.getElementById('noVNC_xvp')
 960                 .classList.contains("noVNC_open")) {
 961                 UI.closeXvpPanel();
 962             } else {
 963                 UI.openXvpPanel();
 964             }
 965         },
 966
 967         // Disable/enable XVP button
 968         updateXvpButton: function(ver) {
 969             if (ver >= 1 && !UI.rfb.get_view_only()) {
 970                 document.getElementById('noVNC_xvp_button')
 971                     .classList.remove("noVNC_hidden");
 972             } else {
 973                 document.getElementById('noVNC_xvp_button')
 974                     .classList.add("noVNC_hidden");
 975                 // Close XVP panel if open
 976                 UI.closeXvpPanel();
 977             }
 978         },
 979
 980 /* ------^-------
 981  *     /XVP
 982  * ==============
 983  *   CLIPBOARD
 984  * ------v------*/
 985
 986         openClipboardPanel: function() {
 987             UI.closeAllPanels();
 988             UI.openControlbar();
 989
 990             document.getElementById('noVNC_clipboard')
 991                 .classList.add("noVNC_open");
 992             document.getElementById('noVNC_clipboard_button')
 993                 .classList.add("noVNC_selected");
 994         },
 995
 996         closeClipboardPanel: function() {
 997             document.getElementById('noVNC_clipboard')
 998                 .classList.remove("noVNC_open");
 999             document.getElementById('noVNC_clipboard_button')
1000                 .classList.remove("noVNC_selected");
1001         },
1002
1003         toggleClipboardPanel: function() {
1004             if (document.getElementById('noVNC_clipboard')
1005                 .classList.contains("noVNC_open")) {
1006                 UI.closeClipboardPanel();
1007             } else {
1008                 UI.openClipboardPanel();
1009             }
1010         },
1011
1012         clipboardReceive: function(rfb, text) {
1013             Util.Debug(">> UI.clipboardReceive: " + text.substr(0,40) + "...");
1014             document.getElementById('noVNC_clipboard_text').value = text;
1015             Util.Debug("<< UI.clipboardReceive");
1016         },
1017
1018         clipboardClear: function() {
1019             document.getElementById('noVNC_clipboard_text').value = "";
1020             UI.rfb.clipboardPasteFrom("");
1021         },
1022
1023         clipboardSend: function() {
1024             var text = document.getElementById('noVNC_clipboard_text').value;
1025             Util.Debug(">> UI.clipboardSend: " + text.substr(0,40) + "...");
1026             UI.rfb.clipboardPasteFrom(text);
1027             Util.Debug("<< UI.clipboardSend");
1028         },
1029
1030 /* ------^-------
1031  *  /CLIPBOARD
1032  * ==============
1033  *  CONNECTION
1034  * ------v------*/
1035
1036         openConnectPanel: function() {
1037             document.getElementById('noVNC_connect_dlg')
1038                 .classList.add("noVNC_open");
1039         },
1040
1041         closeConnectPanel: function() {
1042             document.getElementById('noVNC_connect_dlg')
1043                 .classList.remove("noVNC_open");
1044         },
1045
1046         connect: function(event, password) {
1047             var host = UI.getSetting('host');
1048             var port = UI.getSetting('port');
1049             var path = UI.getSetting('path');
1050
1051             if (typeof password === 'undefined') {
1052                 password = WebUtil.getConfigVar('password');
1053             }
1054
1055             if (password === null) {
1056                 password = undefined;
1057             }
1058
1059             if ((!host) || (!port)) {
1060                 var msg = _("Must set host and port");
1061                 Util.Error(msg);
1062                 UI.showStatus(msg, 'error');
1063                 return;
1064             }
1065
1066             if (!UI.initRFB()) return;
1067
1068             UI.closeAllPanels();
1069             UI.closeConnectPanel();
1070
1071             UI.rfb.set_encrypt(UI.getSetting('encrypt'));
1072             UI.rfb.set_true_color(UI.getSetting('true_color'));
1073             UI.rfb.set_local_cursor(UI.getSetting('cursor'));
1074             UI.rfb.set_shared(UI.getSetting('shared'));
1075             UI.rfb.set_view_only(UI.getSetting('view_only'));
1076             UI.rfb.set_repeaterID(UI.getSetting('repeaterID'));
1077
1078             UI.rfb.connect(host, port, password, path);
1079         },
1080
1081         disconnect: function() {
1082             UI.closeAllPanels();
1083             UI.rfb.disconnect();
1084
1085             // Disable automatic reconnecting
1086             UI.inhibit_reconnect = true;
1087
1088             // Restore the callback used for initial resize
1089             UI.rfb.set_onFBUComplete(UI.initialResize);
1090
1091             // Don't display the connection settings until we're actually disconnected
1092         },
1093
1094         reconnect: function() {
1095             UI.reconnect_callback = null;
1096
1097             // if reconnect has been disabled in the meantime, do nothing.
1098             if (UI.inhibit_reconnect) {
1099                 return;
1100             }
1101
1102             UI.connect(null, UI.reconnect_password);
1103         },
1104
1105         disconnectFinished: function (rfb, reason) {
1106             if (typeof reason !== 'undefined') {
1107                 UI.showStatus(reason, 'error');
1108             } else if (UI.getSetting('reconnect', false) === true && !UI.inhibit_reconnect) {
1109                 document.getElementById("noVNC_transition_text").textContent = _("Reconnecting...");
1110                 document.documentElement.classList.add("noVNC_reconnecting");
1111
1112                 var delay = parseInt(UI.getSetting('reconnect_delay'));
1113                 UI.reconnect_callback = setTimeout(UI.reconnect, delay);
1114                 return;
1115             }
1116
1117             UI.openControlbar();
1118             UI.openConnectPanel();
1119         },
1120
1121         cancelReconnect: function() {
1122             if (UI.reconnect_callback !== null) {
1123                 clearTimeout(UI.reconnect_callback);
1124                 UI.reconnect_callback = null;
1125             }
1126
1127             document.documentElement.classList.remove("noVNC_reconnecting");
1128             UI.openControlbar();
1129             UI.openConnectPanel();
1130         },
1131
1132 /* ------^-------
1133  *  /CONNECTION
1134  * ==============
1135  *   PASSWORD
1136  * ------v------*/
1137
1138         passwordRequired: function(rfb, msg) {
1139
1140             document.getElementById('noVNC_password_dlg')
1141                 .classList.add('noVNC_open');
1142
1143             setTimeout(function () {
1144                     document.getElementById('noVNC_password_input').focus();
1145                 }, 100);
1146
1147             if (typeof msg === 'undefined') {
1148                 msg = _("Password is required");
1149             }
1150             Util.Warn(msg);
1151             UI.showStatus(msg, "warning");
1152         },
1153
1154         setPassword: function() {
1155             var password = document.getElementById('noVNC_password_input').value;
1156             UI.rfb.sendPassword(password);
1157             UI.reconnect_password = password;
1158             document.getElementById('noVNC_password_dlg')
1159                 .classList.remove('noVNC_open');
1160             return false;
1161         },
1162
1163 /* ------^-------
1164  *  /PASSWORD
1165  * ==============
1166  *   FULLSCREEN
1167  * ------v------*/
1168
1169         toggleFullscreen: function() {
1170             if (document.fullscreenElement || // alternative standard method
1171                 document.mozFullScreenElement || // currently working methods
1172                 document.webkitFullscreenElement ||
1173                 document.msFullscreenElement) {
1174                 if (document.exitFullscreen) {
1175                     document.exitFullscreen();
1176                 } else if (document.mozCancelFullScreen) {
1177                     document.mozCancelFullScreen();
1178                 } else if (document.webkitExitFullscreen) {
1179                     document.webkitExitFullscreen();
1180                 } else if (document.msExitFullscreen) {
1181                     document.msExitFullscreen();
1182                 }
1183             } else {
1184                 if (document.documentElement.requestFullscreen) {
1185                     document.documentElement.requestFullscreen();
1186                 } else if (document.documentElement.mozRequestFullScreen) {
1187                     document.documentElement.mozRequestFullScreen();
1188                 } else if (document.documentElement.webkitRequestFullscreen) {
1189                     document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
1190                 } else if (document.body.msRequestFullscreen) {
1191                     document.body.msRequestFullscreen();
1192                 }
1193             }
1194             UI.enableDisableViewClip();
1195             UI.updateFullscreenButton();
1196         },
1197
1198         updateFullscreenButton: function() {
1199             if (document.fullscreenElement || // alternative standard method
1200                 document.mozFullScreenElement || // currently working methods
1201                 document.webkitFullscreenElement ||
1202                 document.msFullscreenElement ) {
1203                 document.getElementById('noVNC_fullscreen_button')
1204                     .classList.add("noVNC_selected");
1205             } else {
1206                 document.getElementById('noVNC_fullscreen_button')
1207                     .classList.remove("noVNC_selected");
1208             }
1209         },
1210
1211 /* ------^-------
1212  *  /FULLSCREEN
1213  * ==============
1214  *     RESIZE
1215  * ------v------*/
1216
1217         // Apply remote resizing or local scaling
1218         applyResizeMode: function() {
1219             if (!UI.rfb) return;
1220
1221             var screen = UI.screenSize();
1222
1223             if (screen && UI.connected && UI.rfb.get_display()) {
1224
1225                 var display = UI.rfb.get_display();
1226                 var resizeMode = UI.getSetting('resize');
1227
1228                 if (resizeMode === 'remote') {
1229
1230                     // Request changing the resolution of the remote display to
1231                     // the size of the local browser viewport.
1232
1233                     // In order to not send multiple requests before the browser-resize
1234                     // is finished we wait 0.5 seconds before sending the request.
1235                     clearTimeout(UI.resizeTimeout);
1236                     UI.resizeTimeout = setTimeout(function(){
1237                         // Request a remote size covering the viewport
1238                         if (UI.rfb.requestDesktopSize(screen.w, screen.h)) {
1239                             Util.Debug('Requested new desktop size: ' +
1240                                        screen.w + 'x' + screen.h);
1241                         }
1242                     }, 500);
1243
1244                 } else if (resizeMode === 'scale' || resizeMode === 'downscale') {
1245                     var downscaleOnly = resizeMode === 'downscale';
1246                     var scaleRatio = display.autoscale(screen.w, screen.h, downscaleOnly);
1247
1248                     if (!UI.rfb.get_view_only()) {
1249                         UI.rfb.get_mouse().set_scale(scaleRatio);
1250                         Util.Debug('Scaling by ' + UI.rfb.get_mouse().get_scale());
1251                     }
1252                 }
1253             }
1254         },
1255
1256         // Gets the the size of the available viewport in the browser window
1257         screenSize: function() {
1258             var screen = document.getElementById('noVNC_screen');
1259
1260             // Hide the scrollbars until the size is calculated
1261             screen.style.overflow = "hidden";
1262
1263             var pos = Util.getPosition(screen);
1264             var w = pos.width;
1265             var h = pos.height;
1266
1267             screen.style.overflow = "visible";
1268
1269             if (isNaN(w) || isNaN(h)) {
1270                 return false;
1271             } else {
1272                 return {w: w, h: h};
1273             }
1274         },
1275
1276         // Normally we only apply the current resize mode after a window resize
1277         // event. This means that when a new connection is opened, there is no
1278         // resize mode active.
1279         // We have to wait until the first FBU because this is where the client
1280         // will find the supported encodings of the server. Some calls later in
1281         // the chain is dependant on knowing the server-capabilities.
1282         initialResize: function(rfb, fbu) {
1283             UI.applyResizeMode();
1284             // After doing this once, we remove the callback.
1285             UI.rfb.set_onFBUComplete(function() { });
1286         },
1287
1288 /* ------^-------
1289  *    /RESIZE
1290  * ==============
1291  *    CLIPPING
1292  * ------v------*/
1293
1294         // Set and configure viewport clipping
1295         setViewClip: function(clip) {
1296             UI.updateSetting('clip', clip);
1297             UI.updateViewClip();
1298         },
1299
1300         // Update parameters that depend on the clip setting
1301         updateViewClip: function() {
1302             if (!UI.rfb) return;
1303
1304             var display = UI.rfb.get_display();
1305             var cur_clip = display.get_viewport();
1306             var new_clip = UI.getSetting('clip');
1307
1308             if (cur_clip !== new_clip) {
1309                 display.set_viewport(new_clip);
1310             }
1311
1312             var size = UI.screenSize();
1313
1314             if (new_clip && size) {
1315                 // When clipping is enabled, the screen is limited to
1316                 // the size of the browser window.
1317                 display.viewportChangeSize(size.w, size.h);
1318             }
1319         },
1320
1321         // Handle special cases where clipping is forced on/off or locked
1322         enableDisableViewClip: function() {
1323             var resizeSetting = UI.getSetting('resize');
1324
1325             if (UI.isSafari) {
1326                 // Safari auto-hides the scrollbars which makes them
1327                 // impossible to use in most cases
1328                 UI.setViewClip(true);
1329                 document.getElementById('noVNC_setting_clip').disabled = true;
1330             } else if (resizeSetting === 'downscale' || resizeSetting === 'scale') {
1331                 // Disable clipping if we are scaling
1332                 UI.forceSetting('clip', false);
1333                 UI.setViewClip(false);
1334                 document.getElementById('noVNC_setting_clip').disabled = true;
1335             } else if (document.msFullscreenElement) {
1336                 // The browser is IE and we are in fullscreen mode.
1337                 // - We need to force clipping while in fullscreen since
1338                 //   scrollbars doesn't work.
1339                 var msg = _("Forcing clipping mode since " +
1340                             "scrollbars aren't supported " +
1341                             "by IE in fullscreen");
1342                 Util.Debug(msg);
1343                 UI.showStatus(msg);
1344                 UI.rememberedClipSetting = UI.getSetting('clip');
1345                 UI.setViewClip(true);
1346                 document.getElementById('noVNC_setting_clip').disabled = true;
1347             } else if (document.body.msRequestFullscreen &&
1348                        UI.rememberedClipSetting !== null) {
1349                 // Restore view clip to what it was before fullscreen on IE
1350                 UI.setViewClip(UI.rememberedClipSetting);
1351                 document.getElementById('noVNC_setting_clip').disabled =
1352                     UI.connected || Util.isTouchDevice;
1353             } else {
1354                 document.getElementById('noVNC_setting_clip').disabled =
1355                     UI.connected || Util.isTouchDevice;
1356                 if (Util.isTouchDevice) {
1357                     UI.setViewClip(true);
1358                 }
1359             }
1360         },
1361
1362 /* ------^-------
1363  *   /CLIPPING
1364  * ==============
1365  *    VIEWDRAG
1366  * ------v------*/
1367
1368         toggleViewDrag: function() {
1369             if (!UI.rfb) return;
1370
1371             var drag = UI.rfb.get_viewportDrag();
1372             UI.setViewDrag(!drag);
1373          },
1374
1375         // Set the view drag mode which moves the viewport on mouse drags
1376         setViewDrag: function(drag) {
1377             if (!UI.rfb) return;
1378
1379             UI.rfb.set_viewportDrag(drag);
1380
1381             UI.updateViewDrag();
1382         },
1383
1384         updateViewDrag: function() {
1385             var clipping = false;
1386
1387             if (!UI.connected) return;
1388
1389             // Check if viewport drag is possible. It is only possible
1390             // if the remote display is clipping the client display.
1391             if (UI.rfb.get_display().get_viewport() &&
1392                 UI.rfb.get_display().clippingDisplay()) {
1393                 clipping = true;
1394             }
1395
1396             var viewDragButton = document.getElementById('noVNC_view_drag_button');
1397
1398             if (!clipping &&
1399                 UI.rfb.get_viewportDrag()) {
1400                 // The size of the remote display is the same or smaller
1401                 // than the client display. Make sure viewport drag isn't
1402                 // active when it can't be used.
1403                 UI.rfb.set_viewportDrag(false);
1404             }
1405
1406             if (UI.rfb.get_viewportDrag()) {
1407                 viewDragButton.classList.add("noVNC_selected");
1408             } else {
1409                 viewDragButton.classList.remove("noVNC_selected");
1410             }
1411
1412             // Different behaviour for touch vs non-touch
1413             // The button is disabled instead of hidden on touch devices
1414             if (Util.isTouchDevice) {
1415                 viewDragButton.classList.remove("noVNC_hidden");
1416
1417                 if (clipping) {
1418                     viewDragButton.disabled = false;
1419                 } else {
1420                     viewDragButton.disabled = true;
1421                 }
1422             } else {
1423                 viewDragButton.disabled = false;
1424
1425                 if (clipping) {
1426                     viewDragButton.classList.remove("noVNC_hidden");
1427                 } else {
1428                     viewDragButton.classList.add("noVNC_hidden");
1429                 }
1430             }
1431         },
1432
1433 /* ------^-------
1434  *   /VIEWDRAG
1435  * ==============
1436  *    KEYBOARD
1437  * ------v------*/
1438
1439         showVirtualKeyboard: function() {
1440             if (!Util.isTouchDevice) return;
1441
1442             var input = document.getElementById('noVNC_keyboardinput');
1443
1444             if (document.activeElement == input) return;
1445
1446             input.focus();
1447
1448             try {
1449                 var l = input.value.length;
1450                 // Move the caret to the end
1451                 input.setSelectionRange(l, l);
1452             } catch (err) {} // setSelectionRange is undefined in Google Chrome
1453         },
1454
1455         hideVirtualKeyboard: function() {
1456             if (!Util.isTouchDevice) return;
1457
1458             var input = document.getElementById('noVNC_keyboardinput');
1459
1460             if (document.activeElement != input) return;
1461
1462             input.blur();
1463         },
1464
1465         toggleVirtualKeyboard: function () {
1466             if (document.getElementById('noVNC_keyboard_button')
1467                 .classList.contains("noVNC_selected")) {
1468                 UI.hideVirtualKeyboard();
1469             } else {
1470                 UI.showVirtualKeyboard();
1471             }
1472         },
1473
1474         onfocusVirtualKeyboard: function(event) {
1475             document.getElementById('noVNC_keyboard_button')
1476                 .classList.add("noVNC_selected");
1477         },
1478
1479         onblurVirtualKeyboard: function(event) {
1480             document.getElementById('noVNC_keyboard_button')
1481                 .classList.remove("noVNC_selected");
1482         },
1483
1484         keepVirtualKeyboard: function(event) {
1485             var input = document.getElementById('noVNC_keyboardinput');
1486
1487             // Only prevent focus change if the virtual keyboard is active
1488             if (document.activeElement != input) {
1489                 return;
1490             }
1491
1492             // Allow clicking on links
1493             if (event.target.tagName === "A") {
1494                 return;
1495             }
1496
1497             // And form elements, except standard noVNC buttons
1498             if ((event.target.form !== undefined) &&
1499                 !event.target.classList.contains("noVNC_button")) {
1500                 return;
1501             }
1502
1503             event.preventDefault();
1504         },
1505
1506         keyboardinputReset: function() {
1507             var kbi = document.getElementById('noVNC_keyboardinput');
1508             kbi.value = new Array(UI.defaultKeyboardinputLen).join("_");
1509             UI.lastKeyboardinput = kbi.value;
1510         },
1511
1512         // When normal keyboard events are left uncought, use the input events from
1513         // the keyboardinput element instead and generate the corresponding key events.
1514         // This code is required since some browsers on Android are inconsistent in
1515         // sending keyCodes in the normal keyboard events when using on screen keyboards.
1516         keyInput: function(event) {
1517
1518             if (!UI.rfb) return;
1519
1520             var newValue = event.target.value;
1521
1522             if (!UI.lastKeyboardinput) {
1523                 UI.keyboardinputReset();
1524             }
1525             var oldValue = UI.lastKeyboardinput;
1526
1527             var newLen;
1528             try {
1529                 // Try to check caret position since whitespace at the end
1530                 // will not be considered by value.length in some browsers
1531                 newLen = Math.max(event.target.selectionStart, newValue.length);
1532             } catch (err) {
1533                 // selectionStart is undefined in Google Chrome
1534                 newLen = newValue.length;
1535             }
1536             var oldLen = oldValue.length;
1537
1538             var backspaces;
1539             var inputs = newLen - oldLen;
1540             if (inputs < 0) {
1541                 backspaces = -inputs;
1542             } else {
1543                 backspaces = 0;
1544             }
1545
1546             // Compare the old string with the new to account for
1547             // text-corrections or other input that modify existing text
1548             var i;
1549             for (i = 0; i < Math.min(oldLen, newLen); i++) {
1550                 if (newValue.charAt(i) != oldValue.charAt(i)) {
1551                     inputs = newLen - i;
1552                     backspaces = oldLen - i;
1553                     break;
1554                 }
1555             }
1556
1557             // Send the key events
1558             for (i = 0; i < backspaces; i++) {
1559                 UI.rfb.sendKey(KeyTable.XK_BackSpace);
1560             }
1561             for (i = newLen - inputs; i < newLen; i++) {
1562                 UI.rfb.sendKey(keysyms.fromUnicode(newValue.charCodeAt(i)).keysym);
1563             }
1564
1565             // Control the text content length in the keyboardinput element
1566             if (newLen > 2 * UI.defaultKeyboardinputLen) {
1567                 UI.keyboardinputReset();
1568             } else if (newLen < 1) {
1569                 // There always have to be some text in the keyboardinput
1570                 // element with which backspace can interact.
1571                 UI.keyboardinputReset();
1572                 // This sometimes causes the keyboard to disappear for a second
1573                 // but it is required for the android keyboard to recognize that
1574                 // text has been added to the field
1575                 event.target.blur();
1576                 // This has to be ran outside of the input handler in order to work
1577                 setTimeout(event.target.focus.bind(event.target), 0);
1578             } else {
1579                 UI.lastKeyboardinput = newValue;
1580             }
1581         },
1582
1583 /* ------^-------
1584  *   /KEYBOARD
1585  * ==============
1586  *   EXTRA KEYS
1587  * ------v------*/
1588
1589         openExtraKeys: function() {
1590             UI.closeAllPanels();
1591             UI.openControlbar();
1592
1593             document.getElementById('noVNC_modifiers')
1594                 .classList.add("noVNC_open");
1595             document.getElementById('noVNC_toggle_extra_keys_button')
1596                 .classList.add("noVNC_selected");
1597         },
1598
1599         closeExtraKeys: function() {
1600             document.getElementById('noVNC_modifiers')
1601                 .classList.remove("noVNC_open");
1602             document.getElementById('noVNC_toggle_extra_keys_button')
1603                 .classList.remove("noVNC_selected");
1604         },
1605
1606         toggleExtraKeys: function() {
1607             if(document.getElementById('noVNC_modifiers')
1608                 .classList.contains("noVNC_open")) {
1609                 UI.closeExtraKeys();
1610             } else  {
1611                 UI.openExtraKeys();
1612             }
1613         },
1614
1615         sendEsc: function() {
1616             UI.rfb.sendKey(KeyTable.XK_Escape);
1617         },
1618
1619         sendTab: function() {
1620             UI.rfb.sendKey(KeyTable.XK_Tab);
1621         },
1622
1623         toggleCtrl: function() {
1624             var btn = document.getElementById('noVNC_toggle_ctrl_button');
1625             if (btn.classList.contains("noVNC_selected")) {
1626                 UI.rfb.sendKey(KeyTable.XK_Control_L, false);
1627                 btn.classList.remove("noVNC_selected");
1628             } else {
1629                 UI.rfb.sendKey(KeyTable.XK_Control_L, true);
1630                 btn.classList.add("noVNC_selected");
1631             }
1632         },
1633
1634         toggleAlt: function() {
1635             var btn = document.getElementById('noVNC_toggle_alt_button');
1636             if (btn.classList.contains("noVNC_selected")) {
1637                 UI.rfb.sendKey(KeyTable.XK_Alt_L, false);
1638                 btn.classList.remove("noVNC_selected");
1639             } else {
1640                 UI.rfb.sendKey(KeyTable.XK_Alt_L, true);
1641                 btn.classList.add("noVNC_selected");
1642             }
1643         },
1644
1645         sendCtrlAltDel: function() {
1646             UI.rfb.sendCtrlAltDel();
1647         },
1648
1649 /* ------^-------
1650  *   /EXTRA KEYS
1651  * ==============
1652  *     MISC
1653  * ------v------*/
1654
1655         setMouseButton: function(num) {
1656             var view_only = UI.rfb.get_view_only();
1657             if (UI.rfb && !view_only) {
1658                 UI.rfb.get_mouse().set_touchButton(num);
1659             }
1660
1661             var blist = [0, 1,2,4];
1662             for (var b = 0; b < blist.length; b++) {
1663                 var button = document.getElementById('noVNC_mouse_button' +
1664                                                      blist[b]);
1665                 if (blist[b] === num && !view_only) {
1666                     button.classList.remove("noVNC_hidden");
1667                 } else {
1668                     button.classList.add("noVNC_hidden");
1669                 }
1670             }
1671         },
1672
1673         displayBlur: function() {
1674             if (UI.rfb && !UI.rfb.get_view_only()) {
1675                 UI.rfb.get_keyboard().set_focused(false);
1676                 UI.rfb.get_mouse().set_focused(false);
1677             }
1678         },
1679
1680         displayFocus: function() {
1681             if (UI.rfb && !UI.rfb.get_view_only()) {
1682                 UI.rfb.get_keyboard().set_focused(true);
1683                 UI.rfb.get_mouse().set_focused(true);
1684             }
1685         },
1686
1687         updateLogging: function() {
1688             WebUtil.init_logging(UI.getSetting('logging'));
1689         },
1690
1691         updateSessionSize: function(rfb, width, height) {
1692             UI.updateViewClip();
1693             UI.updateViewDrag();
1694         },
1695
1696         updateDesktopName: function(rfb, name) {
1697             UI.desktopName = name;
1698             // Display the desktop name in the document title
1699             document.title = name + " - noVNC";
1700         },
1701
1702         bell: function(rfb) {
1703             if (WebUtil.getConfigVar('bell', 'on') === 'on') {
1704                 document.getElementById('noVNC_bell').play();
1705             }
1706         },
1707
1708         //Helper to add options to dropdown.
1709         addOption: function(selectbox, text, value) {
1710             var optn = document.createElement("OPTION");
1711             optn.text = text;
1712             optn.value = value;
1713             selectbox.options.add(optn);
1714         },
1715
1716 /* ------^-------
1717  *    /MISC
1718  * ==============
1719  */
1720     };
1721
1722     /* [module] UI.load(); */
1723 })();
1724
1725 /* [module] export default UI; */