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 import * as Log from '../core/util/logging.js';
  12 import _, { l10n } from './localization.js';
  13 import { isTouchDevice } from '../core/util/browser.js';
  14 import { setCapture, getPointerEvent } from '../core/util/events.js';
  15 import KeyTable from "../core/input/keysym.js";
  16 import keysyms from "../core/input/keysymdef.js";
  17 import Keyboard from "../core/input/keyboard.js";
  18 import RFB from "../core/rfb.js";
  19 import Display from "../core/display.js";
  20 import * as WebUtil from "./webutil.js";
  21
  22 var UI = {
  23
  24     connected: false,
  25     desktopName: "",
  26
  27     statusTimeout: null,
  28     hideKeyboardTimeout: null,
  29     idleControlbarTimeout: null,
  30     closeControlbarTimeout: null,
  31
  32     controlbarGrabbed: false,
  33     controlbarDrag: false,
  34     controlbarMouseDownClientY: 0,
  35     controlbarMouseDownOffsetY: 0,
  36
  37     isSafari: false,
  38     lastKeyboardinput: null,
  39     defaultKeyboardinputLen: 100,
  40
  41     inhibit_reconnect: true,
  42     reconnect_callback: null,
  43     reconnect_password: null,
  44
  45     prime: function(callback) {
  46         if (document.readyState === "interactive" || document.readyState === "complete") {
  47             UI.load(callback);
  48         } else {
  49             document.addEventListener('DOMContentLoaded', UI.load.bind(UI, callback));
  50         }
  51     },
  52
  53     // Setup rfb object, load settings from browser storage, then call
  54     // UI.init to setup the UI/menus
  55     load: function(callback) {
  56         WebUtil.initSettings(UI.start, callback);
  57     },
  58
  59     // Render default UI and initialize settings menu
  60     start: function(callback) {
  61
  62         // Setup global variables first
  63         UI.isSafari = (navigator.userAgent.indexOf('Safari') !== -1 &&
  64                        navigator.userAgent.indexOf('Chrome') === -1);
  65
  66         UI.initSettings();
  67
  68         // Translate the DOM
  69         l10n.translateDOM();
  70
  71         // Adapt the interface for touch screen devices
  72         if (isTouchDevice) {
  73             document.documentElement.classList.add("noVNC_touch");
  74             // Remove the address bar
  75             setTimeout(function() { window.scrollTo(0, 1); }, 100);
  76         }
  77
  78         // Restore control bar position
  79         if (WebUtil.readSetting('controlbar_pos') === 'right') {
  80             UI.toggleControlbarSide();
  81         }
  82
  83         UI.initFullscreen();
  84
  85         // Setup event handlers
  86         UI.addControlbarHandlers();
  87         UI.addTouchSpecificHandlers();
  88         UI.addExtraKeysHandlers();
  89         UI.addMachineHandlers();
  90         UI.addConnectionControlHandlers();
  91         UI.addClipboardHandlers();
  92         UI.addSettingsHandlers();
  93         document.getElementById("noVNC_status")
  94             .addEventListener('click', UI.hideStatus);
  95
  96         // Bootstrap fallback input handler
  97         UI.keyboardinputReset();
  98
  99         UI.openControlbar();
 100
 101         UI.updateVisualState('init');
 102
 103         document.documentElement.classList.remove("noVNC_loading");
 104
 105         var autoconnect = WebUtil.getConfigVar('autoconnect', false);
 106         if (autoconnect === 'true' || autoconnect == '1') {
 107             autoconnect = true;
 108             UI.connect();
 109         } else {
 110             autoconnect = false;
 111             // Show the connect panel on first load unless autoconnecting
 112             UI.openConnectPanel();
 113         }
 114
 115         if (typeof callback === "function") {
 116             callback(UI.rfb);
 117         }
 118     },
 119
 120     initFullscreen: function() {
 121         // Only show the button if fullscreen is properly supported
 122         // * Safari doesn't support alphanumerical input while in fullscreen
 123         if (!UI.isSafari &&
 124             (document.documentElement.requestFullscreen ||
 125              document.documentElement.mozRequestFullScreen ||
 126              document.documentElement.webkitRequestFullscreen ||
 127              document.body.msRequestFullscreen)) {
 128             document.getElementById('noVNC_fullscreen_button')
 129                 .classList.remove("noVNC_hidden");
 130             UI.addFullscreenHandlers();
 131         }
 132     },
 133
 134     initSettings: function() {
 135         var i;
 136
 137         // Logging selection dropdown
 138         var llevels = ['error', 'warn', 'info', 'debug'];
 139         for (i = 0; i < llevels.length; i += 1) {
 140             UI.addOption(document.getElementById('noVNC_setting_logging'),llevels[i], llevels[i]);
 141         }
 142
 143         // Settings with immediate effects
 144         UI.initSetting('logging', 'warn');
 145         UI.updateLogging();
 146
 147         // if port == 80 (or 443) then it won't be present and should be
 148         // set manually
 149         var port = window.location.port;
 150         if (!port) {
 151             if (window.location.protocol.substring(0,5) == 'https') {
 152                 port = 443;
 153             }
 154             else if (window.location.protocol.substring(0,4) == 'http') {
 155                 port = 80;
 156             }
 157         }
 158
 159         /* Populate the controls if defaults are provided in the URL */
 160         UI.initSetting('host', window.location.hostname);
 161         UI.initSetting('port', port);
 162         UI.initSetting('encrypt', (window.location.protocol === "https:"));
 163         UI.initSetting('view_clip', false);
 164         UI.initSetting('resize', 'off');
 165         UI.initSetting('shared', true);
 166         UI.initSetting('view_only', false);
 167         UI.initSetting('path', 'websockify');
 168         UI.initSetting('repeaterID', '');
 169         UI.initSetting('reconnect', false);
 170         UI.initSetting('reconnect_delay', 5000);
 171
 172         UI.setupSettingLabels();
 173     },
 174     // Adds a link to the label elements on the corresponding input elements
 175     setupSettingLabels: function() {
 176         var labels = document.getElementsByTagName('LABEL');
 177         for (var i = 0; i < labels.length; i++) {
 178             var htmlFor = labels[i].htmlFor;
 179             if (htmlFor != '') {
 180                 var elem = document.getElementById(htmlFor);
 181                 if (elem) elem.label = labels[i];
 182             } else {
 183                 // If 'for' isn't set, use the first input element child
 184                 var children = labels[i].children;
 185                 for (var j = 0; j < children.length; j++) {
 186                     if (children[j].form !== undefined) {
 187                         children[j].label = labels[i];
 188                         break;
 189                     }
 190                 }
 191             }
 192         }
 193     },
 194
 195 /* ------^-------
 196 *     /INIT
 197 * ==============
 198 * EVENT HANDLERS
 199 * ------v------*/
 200
 201     addControlbarHandlers: function() {
 202         document.getElementById("noVNC_control_bar")
 203             .addEventListener('mousemove', UI.activateControlbar);
 204         document.getElementById("noVNC_control_bar")
 205             .addEventListener('mouseup', UI.activateControlbar);
 206         document.getElementById("noVNC_control_bar")
 207             .addEventListener('mousedown', UI.activateControlbar);
 208         document.getElementById("noVNC_control_bar")
 209             .addEventListener('keydown', UI.activateControlbar);
 210
 211         document.getElementById("noVNC_control_bar")
 212             .addEventListener('mousedown', UI.keepControlbar);
 213         document.getElementById("noVNC_control_bar")
 214             .addEventListener('keydown', UI.keepControlbar);
 215
 216         document.getElementById("noVNC_view_drag_button")
 217             .addEventListener('click', UI.toggleViewDrag);
 218
 219         document.getElementById("noVNC_control_bar_handle")
 220             .addEventListener('mousedown', UI.controlbarHandleMouseDown);
 221         document.getElementById("noVNC_control_bar_handle")
 222             .addEventListener('mouseup', UI.controlbarHandleMouseUp);
 223         document.getElementById("noVNC_control_bar_handle")
 224             .addEventListener('mousemove', UI.dragControlbarHandle);
 225         // resize events aren't available for elements
 226         window.addEventListener('resize', UI.updateControlbarHandle);
 227
 228         var exps = document.getElementsByClassName("noVNC_expander");
 229         for (var i = 0;i < exps.length;i++) {
 230             exps[i].addEventListener('click', UI.toggleExpander);
 231         }
 232     },
 233
 234     addTouchSpecificHandlers: function() {
 235         document.getElementById("noVNC_mouse_button0")
 236             .addEventListener('click', function () { UI.setMouseButton(1); });
 237         document.getElementById("noVNC_mouse_button1")
 238             .addEventListener('click', function () { UI.setMouseButton(2); });
 239         document.getElementById("noVNC_mouse_button2")
 240             .addEventListener('click', function () { UI.setMouseButton(4); });
 241         document.getElementById("noVNC_mouse_button4")
 242             .addEventListener('click', function () { UI.setMouseButton(0); });
 243         document.getElementById("noVNC_keyboard_button")
 244             .addEventListener('click', UI.toggleVirtualKeyboard);
 245
 246         UI.touchKeyboard = new Keyboard(document.getElementById('noVNC_keyboardinput'));
 247         UI.touchKeyboard.onkeyevent = UI.keyEvent;
 248         UI.touchKeyboard.grab();
 249         document.getElementById("noVNC_keyboardinput")
 250             .addEventListener('input', UI.keyInput);
 251         document.getElementById("noVNC_keyboardinput")
 252             .addEventListener('focus', UI.onfocusVirtualKeyboard);
 253         document.getElementById("noVNC_keyboardinput")
 254             .addEventListener('blur', UI.onblurVirtualKeyboard);
 255         document.getElementById("noVNC_keyboardinput")
 256             .addEventListener('submit', function () { return false; });
 257
 258         document.documentElement
 259             .addEventListener('mousedown', UI.keepVirtualKeyboard, true);
 260
 261         document.getElementById("noVNC_control_bar")
 262             .addEventListener('touchstart', UI.activateControlbar);
 263         document.getElementById("noVNC_control_bar")
 264             .addEventListener('touchmove', UI.activateControlbar);
 265         document.getElementById("noVNC_control_bar")
 266             .addEventListener('touchend', UI.activateControlbar);
 267         document.getElementById("noVNC_control_bar")
 268             .addEventListener('input', UI.activateControlbar);
 269
 270         document.getElementById("noVNC_control_bar")
 271             .addEventListener('touchstart', UI.keepControlbar);
 272         document.getElementById("noVNC_control_bar")
 273             .addEventListener('input', UI.keepControlbar);
 274
 275         document.getElementById("noVNC_control_bar_handle")
 276             .addEventListener('touchstart', UI.controlbarHandleMouseDown);
 277         document.getElementById("noVNC_control_bar_handle")
 278             .addEventListener('touchend', UI.controlbarHandleMouseUp);
 279         document.getElementById("noVNC_control_bar_handle")
 280             .addEventListener('touchmove', UI.dragControlbarHandle);
 281     },
 282
 283     addExtraKeysHandlers: function() {
 284         document.getElementById("noVNC_toggle_extra_keys_button")
 285             .addEventListener('click', UI.toggleExtraKeys);
 286         document.getElementById("noVNC_toggle_ctrl_button")
 287             .addEventListener('click', UI.toggleCtrl);
 288         document.getElementById("noVNC_toggle_alt_button")
 289             .addEventListener('click', UI.toggleAlt);
 290         document.getElementById("noVNC_send_tab_button")
 291             .addEventListener('click', UI.sendTab);
 292         document.getElementById("noVNC_send_esc_button")
 293             .addEventListener('click', UI.sendEsc);
 294         document.getElementById("noVNC_send_ctrl_alt_del_button")
 295             .addEventListener('click', UI.sendCtrlAltDel);
 296     },
 297
 298     addMachineHandlers: function() {
 299         document.getElementById("noVNC_shutdown_button")
 300             .addEventListener('click', function() { UI.rfb.machineShutdown(); });
 301         document.getElementById("noVNC_reboot_button")
 302             .addEventListener('click', function() { UI.rfb.machineReboot(); });
 303         document.getElementById("noVNC_reset_button")
 304             .addEventListener('click', function() { UI.rfb.machineReset(); });
 305         document.getElementById("noVNC_power_button")
 306             .addEventListener('click', UI.togglePowerPanel);
 307     },
 308
 309     addConnectionControlHandlers: function() {
 310         document.getElementById("noVNC_disconnect_button")
 311             .addEventListener('click', UI.disconnect);
 312         document.getElementById("noVNC_connect_button")
 313             .addEventListener('click', UI.connect);
 314         document.getElementById("noVNC_cancel_reconnect_button")
 315             .addEventListener('click', UI.cancelReconnect);
 316
 317         document.getElementById("noVNC_password_button")
 318             .addEventListener('click', UI.setPassword);
 319     },
 320
 321     addClipboardHandlers: function() {
 322         document.getElementById("noVNC_clipboard_button")
 323             .addEventListener('click', UI.toggleClipboardPanel);
 324         document.getElementById("noVNC_clipboard_text")
 325             .addEventListener('change', UI.clipboardSend);
 326         document.getElementById("noVNC_clipboard_clear_button")
 327             .addEventListener('click', UI.clipboardClear);
 328     },
 329
 330     // Add a call to save settings when the element changes,
 331     // unless the optional parameter changeFunc is used instead.
 332     addSettingChangeHandler: function(name, changeFunc) {
 333         var settingElem = document.getElementById("noVNC_setting_" + name);
 334         if (changeFunc === undefined) {
 335             changeFunc = function () { UI.saveSetting(name); };
 336         }
 337         settingElem.addEventListener('change', changeFunc);
 338     },
 339
 340     addSettingsHandlers: function() {
 341         document.getElementById("noVNC_settings_button")
 342             .addEventListener('click', UI.toggleSettingsPanel);
 343
 344         UI.addSettingChangeHandler('encrypt');
 345         UI.addSettingChangeHandler('resize');
 346         UI.addSettingChangeHandler('resize', UI.enableDisableViewClip);
 347         UI.addSettingChangeHandler('resize', UI.applyResizeMode);
 348         UI.addSettingChangeHandler('view_clip');
 349         UI.addSettingChangeHandler('view_clip', UI.updateViewClip);
 350         UI.addSettingChangeHandler('shared');
 351         UI.addSettingChangeHandler('view_only');
 352         UI.addSettingChangeHandler('view_only', UI.updateViewOnly);
 353         UI.addSettingChangeHandler('host');
 354         UI.addSettingChangeHandler('port');
 355         UI.addSettingChangeHandler('path');
 356         UI.addSettingChangeHandler('repeaterID');
 357         UI.addSettingChangeHandler('logging');
 358         UI.addSettingChangeHandler('logging', UI.updateLogging);
 359         UI.addSettingChangeHandler('reconnect');
 360         UI.addSettingChangeHandler('reconnect_delay');
 361     },
 362
 363     addFullscreenHandlers: function() {
 364         document.getElementById("noVNC_fullscreen_button")
 365             .addEventListener('click', UI.toggleFullscreen);
 366
 367         window.addEventListener('fullscreenchange', UI.updateFullscreenButton);
 368         window.addEventListener('mozfullscreenchange', UI.updateFullscreenButton);
 369         window.addEventListener('webkitfullscreenchange', UI.updateFullscreenButton);
 370         window.addEventListener('msfullscreenchange', UI.updateFullscreenButton);
 371     },
 372
 373 /* ------^-------
 374  * /EVENT HANDLERS
 375  * ==============
 376  *     VISUAL
 377  * ------v------*/
 378
 379     // Disable/enable controls depending on connection state
 380     updateVisualState: function(state) {
 381
 382         document.documentElement.classList.remove("noVNC_connecting");
 383         document.documentElement.classList.remove("noVNC_connected");
 384         document.documentElement.classList.remove("noVNC_disconnecting");
 385         document.documentElement.classList.remove("noVNC_reconnecting");
 386
 387         let transition_elem = document.getElementById("noVNC_transition_text");
 388         switch (state) {
 389             case 'init':
 390                 break;
 391             case 'connecting':
 392                 transition_elem.textContent = _("Connecting...");
 393                 document.documentElement.classList.add("noVNC_connecting");
 394                 break;
 395             case 'connected':
 396                 document.documentElement.classList.add("noVNC_connected");
 397                 break;
 398             case 'disconnecting':
 399                 transition_elem.textContent = _("Disconnecting...");
 400                 document.documentElement.classList.add("noVNC_disconnecting");
 401                 break;
 402             case 'disconnected':
 403                 break;
 404             case 'reconnecting':
 405                 transition_elem.textContent = _("Reconnecting...");
 406                 document.documentElement.classList.add("noVNC_reconnecting");
 407                 break;
 408             default:
 409                 Log.Error("Invalid visual state: " + state);
 410                 UI.showStatus(_("Internal error"), 'error');
 411                 return;
 412         }
 413
 414         UI.enableDisableViewClip();
 415
 416         if (UI.connected) {
 417             UI.disableSetting('encrypt');
 418             UI.disableSetting('shared');
 419             UI.disableSetting('host');
 420             UI.disableSetting('port');
 421             UI.disableSetting('path');
 422             UI.disableSetting('repeaterID');
 423             UI.setMouseButton(1);
 424
 425             // Hide the controlbar after 2 seconds
 426             UI.closeControlbarTimeout = setTimeout(UI.closeControlbar, 2000);
 427         } else {
 428             UI.enableSetting('encrypt');
 429             UI.enableSetting('shared');
 430             UI.enableSetting('host');
 431             UI.enableSetting('port');
 432             UI.enableSetting('path');
 433             UI.enableSetting('repeaterID');
 434             UI.updatePowerButton();
 435             UI.keepControlbar();
 436         }
 437
 438         // State change disables viewport dragging.
 439         // It is enabled (toggled) by direct click on the button
 440         UI.setViewDrag(false);
 441
 442         // State change also closes the password dialog
 443         document.getElementById('noVNC_password_dlg')
 444             .classList.remove('noVNC_open');
 445     },
 446
 447     showStatus: function(text, status_type, time) {
 448         var statusElem = document.getElementById('noVNC_status');
 449
 450         clearTimeout(UI.statusTimeout);
 451
 452         if (typeof status_type === 'undefined') {
 453             status_type = 'normal';
 454         }
 455
 456         // Don't overwrite more severe visible statuses and never
 457         // errors. Only shows the first error.
 458         let visible_status_type = 'none';
 459         if (statusElem.classList.contains("noVNC_open")) {
 460             if (statusElem.classList.contains("noVNC_status_error")) {
 461                 visible_status_type = 'error';
 462             } else if (statusElem.classList.contains("noVNC_status_warn")) {
 463                 visible_status_type = 'warn';
 464             } else {
 465                 visible_status_type = 'normal';
 466             }
 467         }
 468         if (visible_status_type === 'error' ||
 469             (visible_status_type === 'warn' && status_type === 'normal')) {
 470             return;
 471         }
 472
 473         switch (status_type) {
 474             case 'error':
 475                 statusElem.classList.remove("noVNC_status_warn");
 476                 statusElem.classList.remove("noVNC_status_normal");
 477                 statusElem.classList.add("noVNC_status_error");
 478                 break;
 479             case 'warning':
 480             case 'warn':
 481                 statusElem.classList.remove("noVNC_status_error");
 482                 statusElem.classList.remove("noVNC_status_normal");
 483                 statusElem.classList.add("noVNC_status_warn");
 484                 break;
 485             case 'normal':
 486             case 'info':
 487             default:
 488                 statusElem.classList.remove("noVNC_status_error");
 489                 statusElem.classList.remove("noVNC_status_warn");
 490                 statusElem.classList.add("noVNC_status_normal");
 491                 break;
 492         }
 493
 494         statusElem.textContent = text;
 495         statusElem.classList.add("noVNC_open");
 496
 497         // If no time was specified, show the status for 1.5 seconds
 498         if (typeof time === 'undefined') {
 499             time = 1500;
 500         }
 501
 502         // Error messages do not timeout
 503         if (status_type !== 'error') {
 504             UI.statusTimeout = window.setTimeout(UI.hideStatus, time);
 505         }
 506     },
 507
 508     hideStatus: function() {
 509         clearTimeout(UI.statusTimeout);
 510         document.getElementById('noVNC_status').classList.remove("noVNC_open");
 511     },
 512
 513     activateControlbar: function(event) {
 514         clearTimeout(UI.idleControlbarTimeout);
 515         // We manipulate the anchor instead of the actual control
 516         // bar in order to avoid creating new a stacking group
 517         document.getElementById('noVNC_control_bar_anchor')
 518             .classList.remove("noVNC_idle");
 519         UI.idleControlbarTimeout = window.setTimeout(UI.idleControlbar, 2000);
 520     },
 521
 522     idleControlbar: function() {
 523         document.getElementById('noVNC_control_bar_anchor')
 524             .classList.add("noVNC_idle");
 525     },
 526
 527     keepControlbar: function() {
 528         clearTimeout(UI.closeControlbarTimeout);
 529     },
 530
 531     openControlbar: function() {
 532         document.getElementById('noVNC_control_bar')
 533             .classList.add("noVNC_open");
 534     },
 535
 536     closeControlbar: function() {
 537         UI.closeAllPanels();
 538         document.getElementById('noVNC_control_bar')
 539             .classList.remove("noVNC_open");
 540     },
 541
 542     toggleControlbar: function() {
 543         if (document.getElementById('noVNC_control_bar')
 544             .classList.contains("noVNC_open")) {
 545             UI.closeControlbar();
 546         } else {
 547             UI.openControlbar();
 548         }
 549     },
 550
 551     toggleControlbarSide: function () {
 552         // Temporarily disable animation to avoid weird movement
 553         var bar = document.getElementById('noVNC_control_bar');
 554         bar.style.transitionDuration = '0s';
 555         bar.addEventListener('transitionend', function () { this.style.transitionDuration = ""; });
 556
 557         var anchor = document.getElementById('noVNC_control_bar_anchor');
 558         if (anchor.classList.contains("noVNC_right")) {
 559             WebUtil.writeSetting('controlbar_pos', 'left');
 560             anchor.classList.remove("noVNC_right");
 561         } else {
 562             WebUtil.writeSetting('controlbar_pos', 'right');
 563             anchor.classList.add("noVNC_right");
 564         }
 565
 566         // Consider this a movement of the handle
 567         UI.controlbarDrag = true;
 568     },
 569
 570     showControlbarHint: function (show) {
 571         var hint = document.getElementById('noVNC_control_bar_hint');
 572         if (show) {
 573             hint.classList.add("noVNC_active");
 574         } else {
 575             hint.classList.remove("noVNC_active");
 576         }
 577     },
 578
 579     dragControlbarHandle: function (e) {
 580         if (!UI.controlbarGrabbed) return;
 581
 582         var ptr = getPointerEvent(e);
 583
 584         var anchor = document.getElementById('noVNC_control_bar_anchor');
 585         if (ptr.clientX < (window.innerWidth * 0.1)) {
 586             if (anchor.classList.contains("noVNC_right")) {
 587                 UI.toggleControlbarSide();
 588             }
 589         } else if (ptr.clientX > (window.innerWidth * 0.9)) {
 590             if (!anchor.classList.contains("noVNC_right")) {
 591                 UI.toggleControlbarSide();
 592             }
 593         }
 594
 595         if (!UI.controlbarDrag) {
 596             // The goal is to trigger on a certain physical width, the
 597             // devicePixelRatio brings us a bit closer but is not optimal.
 598             var dragThreshold = 10 * (window.devicePixelRatio || 1);
 599             var dragDistance = Math.abs(ptr.clientY - UI.controlbarMouseDownClientY);
 600
 601             if (dragDistance < dragThreshold) return;
 602
 603             UI.controlbarDrag = true;
 604         }
 605
 606         var eventY = ptr.clientY - UI.controlbarMouseDownOffsetY;
 607
 608         UI.moveControlbarHandle(eventY);
 609
 610         e.preventDefault();
 611         e.stopPropagation();
 612         UI.keepControlbar();
 613         UI.activateControlbar();
 614     },
 615
 616     // Move the handle but don't allow any position outside the bounds
 617     moveControlbarHandle: function (viewportRelativeY) {
 618         var handle = document.getElementById("noVNC_control_bar_handle");
 619         var handleHeight = handle.getBoundingClientRect().height;
 620         var controlbarBounds = document.getElementById("noVNC_control_bar")
 621             .getBoundingClientRect();
 622         var margin = 10;
 623
 624         // These heights need to be non-zero for the below logic to work
 625         if (handleHeight === 0 || controlbarBounds.height === 0) {
 626             return;
 627         }
 628
 629         var newY = viewportRelativeY;
 630
 631         // Check if the coordinates are outside the control bar
 632         if (newY < controlbarBounds.top + margin) {
 633             // Force coordinates to be below the top of the control bar
 634             newY = controlbarBounds.top + margin;
 635
 636         } else if (newY > controlbarBounds.top +
 637                    controlbarBounds.height - handleHeight - margin) {
 638             // Force coordinates to be above the bottom of the control bar
 639             newY = controlbarBounds.top +
 640                 controlbarBounds.height - handleHeight - margin;
 641         }
 642
 643         // Corner case: control bar too small for stable position
 644         if (controlbarBounds.height < (handleHeight + margin * 2)) {
 645             newY = controlbarBounds.top +
 646                 (controlbarBounds.height - handleHeight) / 2;
 647         }
 648
 649         // The transform needs coordinates that are relative to the parent
 650         var parentRelativeY = newY - controlbarBounds.top;
 651         handle.style.transform = "translateY(" + parentRelativeY + "px)";
 652     },
 653
 654     updateControlbarHandle: function () {
 655         // Since the control bar is fixed on the viewport and not the page,
 656         // the move function expects coordinates relative the the viewport.
 657         var handle = document.getElementById("noVNC_control_bar_handle");
 658         var handleBounds = handle.getBoundingClientRect();
 659         UI.moveControlbarHandle(handleBounds.top);
 660     },
 661
 662     controlbarHandleMouseUp: function(e) {
 663         if ((e.type == "mouseup") && (e.button != 0)) return;
 664
 665         // mouseup and mousedown on the same place toggles the controlbar
 666         if (UI.controlbarGrabbed && !UI.controlbarDrag) {
 667             UI.toggleControlbar();
 668             e.preventDefault();
 669             e.stopPropagation();
 670             UI.keepControlbar();
 671             UI.activateControlbar();
 672         }
 673         UI.controlbarGrabbed = false;
 674         UI.showControlbarHint(false);
 675     },
 676
 677     controlbarHandleMouseDown: function(e) {
 678         if ((e.type == "mousedown") && (e.button != 0)) return;
 679
 680         var ptr = getPointerEvent(e);
 681
 682         var handle = document.getElementById("noVNC_control_bar_handle");
 683         var bounds = handle.getBoundingClientRect();
 684
 685         // Touch events have implicit capture
 686         if (e.type === "mousedown") {
 687             setCapture(handle);
 688         }
 689
 690         UI.controlbarGrabbed = true;
 691         UI.controlbarDrag = false;
 692
 693         UI.showControlbarHint(true);
 694
 695         UI.controlbarMouseDownClientY = ptr.clientY;
 696         UI.controlbarMouseDownOffsetY = ptr.clientY - bounds.top;
 697         e.preventDefault();
 698         e.stopPropagation();
 699         UI.keepControlbar();
 700         UI.activateControlbar();
 701     },
 702
 703     toggleExpander: function(e) {
 704         if (this.classList.contains("noVNC_open")) {
 705             this.classList.remove("noVNC_open");
 706         } else {
 707             this.classList.add("noVNC_open");
 708         }
 709     },
 710
 711 /* ------^-------
 712  *    /VISUAL
 713  * ==============
 714  *    SETTINGS
 715  * ------v------*/
 716
 717     // Initial page load read/initialization of settings
 718     initSetting: function(name, defVal) {
 719         // Check Query string followed by cookie
 720         var val = WebUtil.getConfigVar(name);
 721         if (val === null) {
 722             val = WebUtil.readSetting(name, defVal);
 723         }
 724         UI.updateSetting(name, val);
 725         return val;
 726     },
 727
 728     // Update cookie and form control setting. If value is not set, then
 729     // updates from control to current cookie setting.
 730     updateSetting: function(name, value) {
 731
 732         // Save the cookie for this session
 733         if (typeof value !== 'undefined') {
 734             WebUtil.writeSetting(name, value);
 735         }
 736
 737         // Update the settings control
 738         value = UI.getSetting(name);
 739
 740         var ctrl = document.getElementById('noVNC_setting_' + name);
 741         if (ctrl.type === 'checkbox') {
 742             ctrl.checked = value;
 743
 744         } else if (typeof ctrl.options !== 'undefined') {
 745             for (var i = 0; i < ctrl.options.length; i += 1) {
 746                 if (ctrl.options[i].value === value) {
 747                     ctrl.selectedIndex = i;
 748                     break;
 749                 }
 750             }
 751         } else {
 752             /*Weird IE9 error leads to 'null' appearring
 753             in textboxes instead of ''.*/
 754             if (value === null) {
 755                 value = "";
 756             }
 757             ctrl.value = value;
 758         }
 759     },
 760
 761     // Save control setting to cookie
 762     saveSetting: function(name) {
 763         var val, ctrl = document.getElementById('noVNC_setting_' + name);
 764         if (ctrl.type === 'checkbox') {
 765             val = ctrl.checked;
 766         } else if (typeof ctrl.options !== 'undefined') {
 767             val = ctrl.options[ctrl.selectedIndex].value;
 768         } else {
 769             val = ctrl.value;
 770         }
 771         WebUtil.writeSetting(name, val);
 772         //Log.Debug("Setting saved '" + name + "=" + val + "'");
 773         return val;
 774     },
 775
 776     // Read form control compatible setting from cookie
 777     getSetting: function(name) {
 778         var ctrl = document.getElementById('noVNC_setting_' + name);
 779         var val = WebUtil.readSetting(name);
 780         if (typeof val !== 'undefined' && val !== null && ctrl.type === 'checkbox') {
 781             if (val.toString().toLowerCase() in {'0':1, 'no':1, 'false':1}) {
 782                 val = false;
 783             } else {
 784                 val = true;
 785             }
 786         }
 787         return val;
 788     },
 789
 790     // These helpers compensate for the lack of parent-selectors and
 791     // previous-sibling-selectors in CSS which are needed when we want to
 792     // disable the labels that belong to disabled input elements.
 793     disableSetting: function(name) {
 794         var ctrl = document.getElementById('noVNC_setting_' + name);
 795         ctrl.disabled = true;
 796         ctrl.label.classList.add('noVNC_disabled');
 797     },
 798
 799     enableSetting: function(name) {
 800         var ctrl = document.getElementById('noVNC_setting_' + name);
 801         ctrl.disabled = false;
 802         ctrl.label.classList.remove('noVNC_disabled');
 803     },
 804
 805 /* ------^-------
 806  *   /SETTINGS
 807  * ==============
 808  *    PANELS
 809  * ------v------*/
 810
 811     closeAllPanels: function() {
 812         UI.closeSettingsPanel();
 813         UI.closePowerPanel();
 814         UI.closeClipboardPanel();
 815         UI.closeExtraKeys();
 816     },
 817
 818 /* ------^-------
 819  *   /PANELS
 820  * ==============
 821  * SETTINGS (panel)
 822  * ------v------*/
 823
 824     openSettingsPanel: function() {
 825         UI.closeAllPanels();
 826         UI.openControlbar();
 827
 828         // Refresh UI elements from saved cookies
 829         UI.updateSetting('encrypt');
 830         UI.updateSetting('view_clip');
 831         UI.updateSetting('resize');
 832         UI.updateSetting('shared');
 833         UI.updateSetting('view_only');
 834         UI.updateSetting('path');
 835         UI.updateSetting('repeaterID');
 836         UI.updateSetting('logging');
 837         UI.updateSetting('reconnect');
 838         UI.updateSetting('reconnect_delay');
 839
 840         document.getElementById('noVNC_settings')
 841             .classList.add("noVNC_open");
 842         document.getElementById('noVNC_settings_button')
 843             .classList.add("noVNC_selected");
 844     },
 845
 846     closeSettingsPanel: function() {
 847         document.getElementById('noVNC_settings')
 848             .classList.remove("noVNC_open");
 849         document.getElementById('noVNC_settings_button')
 850             .classList.remove("noVNC_selected");
 851     },
 852
 853     toggleSettingsPanel: function() {
 854         if (document.getElementById('noVNC_settings')
 855             .classList.contains("noVNC_open")) {
 856             UI.closeSettingsPanel();
 857         } else {
 858             UI.openSettingsPanel();
 859         }
 860     },
 861
 862 /* ------^-------
 863  *   /SETTINGS
 864  * ==============
 865  *     POWER
 866  * ------v------*/
 867
 868     openPowerPanel: function() {
 869         UI.closeAllPanels();
 870         UI.openControlbar();
 871
 872         document.getElementById('noVNC_power')
 873             .classList.add("noVNC_open");
 874         document.getElementById('noVNC_power_button')
 875             .classList.add("noVNC_selected");
 876     },
 877
 878     closePowerPanel: function() {
 879         document.getElementById('noVNC_power')
 880             .classList.remove("noVNC_open");
 881         document.getElementById('noVNC_power_button')
 882             .classList.remove("noVNC_selected");
 883     },
 884
 885     togglePowerPanel: function() {
 886         if (document.getElementById('noVNC_power')
 887             .classList.contains("noVNC_open")) {
 888             UI.closePowerPanel();
 889         } else {
 890             UI.openPowerPanel();
 891         }
 892     },
 893
 894     // Disable/enable power button
 895     updatePowerButton: function() {
 896         if (UI.connected &&
 897             UI.rfb.capabilities.power &&
 898             !UI.rfb.viewOnly) {
 899             document.getElementById('noVNC_power_button')
 900                 .classList.remove("noVNC_hidden");
 901         } else {
 902             document.getElementById('noVNC_power_button')
 903                 .classList.add("noVNC_hidden");
 904             // Close power panel if open
 905             UI.closePowerPanel();
 906         }
 907     },
 908
 909 /* ------^-------
 910  *    /POWER
 911  * ==============
 912  *   CLIPBOARD
 913  * ------v------*/
 914
 915     openClipboardPanel: function() {
 916         UI.closeAllPanels();
 917         UI.openControlbar();
 918
 919         document.getElementById('noVNC_clipboard')
 920             .classList.add("noVNC_open");
 921         document.getElementById('noVNC_clipboard_button')
 922             .classList.add("noVNC_selected");
 923     },
 924
 925     closeClipboardPanel: function() {
 926         document.getElementById('noVNC_clipboard')
 927             .classList.remove("noVNC_open");
 928         document.getElementById('noVNC_clipboard_button')
 929             .classList.remove("noVNC_selected");
 930     },
 931
 932     toggleClipboardPanel: function() {
 933         if (document.getElementById('noVNC_clipboard')
 934             .classList.contains("noVNC_open")) {
 935             UI.closeClipboardPanel();
 936         } else {
 937             UI.openClipboardPanel();
 938         }
 939     },
 940
 941     clipboardReceive: function(e) {
 942         Log.Debug(">> UI.clipboardReceive: " + e.detail.text.substr(0,40) + "...");
 943         document.getElementById('noVNC_clipboard_text').value = e.detail.text;
 944         Log.Debug("<< UI.clipboardReceive");
 945     },
 946
 947     clipboardClear: function() {
 948         document.getElementById('noVNC_clipboard_text').value = "";
 949         UI.rfb.clipboardPasteFrom("");
 950     },
 951
 952     clipboardSend: function() {
 953         var text = document.getElementById('noVNC_clipboard_text').value;
 954         Log.Debug(">> UI.clipboardSend: " + text.substr(0,40) + "...");
 955         UI.rfb.clipboardPasteFrom(text);
 956         Log.Debug("<< UI.clipboardSend");
 957     },
 958
 959 /* ------^-------
 960  *  /CLIPBOARD
 961  * ==============
 962  *  CONNECTION
 963  * ------v------*/
 964
 965     openConnectPanel: function() {
 966         document.getElementById('noVNC_connect_dlg')
 967             .classList.add("noVNC_open");
 968     },
 969
 970     closeConnectPanel: function() {
 971         document.getElementById('noVNC_connect_dlg')
 972             .classList.remove("noVNC_open");
 973     },
 974
 975     connect: function(event, password) {
 976
 977         // Ignore when rfb already exists
 978         if (typeof UI.rfb !== 'undefined') {
 979             return;
 980         }
 981
 982         var host = UI.getSetting('host');
 983         var port = UI.getSetting('port');
 984         var path = UI.getSetting('path');
 985
 986         if (typeof password === 'undefined') {
 987             password = WebUtil.getConfigVar('password');
 988             UI.reconnect_password = password;
 989         }
 990
 991         if (password === null) {
 992             password = undefined;
 993         }
 994
 995         UI.hideStatus();
 996
 997         if (!host) {
 998             Log.Error("Can't connect when host is: " + host);
 999             UI.showStatus(_("Must set host"), 'error');
1000             return;
1001         }
1002
1003         UI.closeAllPanels();
1004         UI.closeConnectPanel();
1005
1006         UI.updateVisualState('connecting');
1007
1008         var url;
1009
1010         url = UI.getSetting('encrypt') ? 'wss' : 'ws';
1011
1012         url += '://' + host;
1013         if(port) {
1014             url += ':' + port;
1015         }
1016         url += '/' + path;
1017
1018         UI.rfb = new RFB(document.getElementById('noVNC_container'), url,
1019                          { shared: UI.getSetting('shared'),
1020                            repeaterID: UI.getSetting('repeaterID'),
1021                            credentials: { password: password } });
1022         UI.rfb.addEventListener("connect", UI.connectFinished);
1023         UI.rfb.addEventListener("disconnect", UI.disconnectFinished);
1024         UI.rfb.addEventListener("credentialsrequired", UI.credentials);
1025         UI.rfb.addEventListener("securityfailure", UI.securityFailed);
1026         UI.rfb.addEventListener("capabilities", function () { UI.updatePowerButton(); });
1027         UI.rfb.addEventListener("clipboard", UI.clipboardReceive);
1028         UI.rfb.addEventListener("bell", UI.bell);
1029         UI.rfb.addEventListener("desktopname", UI.updateDesktopName);
1030         UI.rfb.clipViewport = UI.getSetting('view_clip');
1031         UI.rfb.scaleViewport = UI.getSetting('resize') === 'scale';
1032         UI.rfb.resizeSession = UI.getSetting('resize') === 'remote';
1033
1034         UI.updateViewOnly(); // requires UI.rfb
1035     },
1036
1037     disconnect: function() {
1038         UI.closeAllPanels();
1039         UI.rfb.disconnect();
1040
1041         UI.connected = false;
1042
1043         // Disable automatic reconnecting
1044         UI.inhibit_reconnect = true;
1045
1046         UI.updateVisualState('disconnecting');
1047
1048         // Don't display the connection settings until we're actually disconnected
1049     },
1050
1051     reconnect: function() {
1052         UI.reconnect_callback = null;
1053
1054         // if reconnect has been disabled in the meantime, do nothing.
1055         if (UI.inhibit_reconnect) {
1056             return;
1057         }
1058
1059         UI.connect(null, UI.reconnect_password);
1060     },
1061
1062     cancelReconnect: function() {
1063         if (UI.reconnect_callback !== null) {
1064             clearTimeout(UI.reconnect_callback);
1065             UI.reconnect_callback = null;
1066         }
1067
1068         UI.updateVisualState('disconnected');
1069
1070         UI.openControlbar();
1071         UI.openConnectPanel();
1072     },
1073
1074     connectFinished: function (e) {
1075         UI.connected = true;
1076         UI.inhibit_reconnect = false;
1077
1078         let msg;
1079         if (UI.getSetting('encrypt')) {
1080             msg = _("Connected (encrypted) to ") + UI.desktopName;
1081         } else {
1082             msg = _("Connected (unencrypted) to ") + UI.desktopName;
1083         }
1084         UI.showStatus(msg);
1085         UI.updateVisualState('connected');
1086
1087         // Do this last because it can only be used on rendered elements
1088         UI.rfb.focus();
1089     },
1090
1091     disconnectFinished: function (e) {
1092         let wasConnected = UI.connected;
1093
1094         // This variable is ideally set when disconnection starts, but
1095         // when the disconnection isn't clean or if it is initiated by
1096         // the server, we need to do it here as well since
1097         // UI.disconnect() won't be used in those cases.
1098         UI.connected = false;
1099
1100         UI.rfb = undefined;
1101
1102         if (!e.detail.clean) {
1103             UI.updateVisualState('disconnected');
1104             if (wasConnected) {
1105                 UI.showStatus(_("Something went wrong, connection is closed"),
1106                               'error');
1107             } else {
1108                 UI.showStatus(_("Failed to connect to server"), 'error');
1109             }
1110         } else if (UI.getSetting('reconnect', false) === true && !UI.inhibit_reconnect) {
1111             UI.updateVisualState('reconnecting');
1112
1113             var delay = parseInt(UI.getSetting('reconnect_delay'));
1114             UI.reconnect_callback = setTimeout(UI.reconnect, delay);
1115             return;
1116         } else {
1117             UI.updateVisualState('disconnected');
1118             UI.showStatus(_("Disconnected"), 'normal');
1119         }
1120
1121         UI.openControlbar();
1122         UI.openConnectPanel();
1123     },
1124
1125     securityFailed: function (e) {
1126         let msg = "";
1127         // On security failures we might get a string with a reason
1128         // directly from the server. Note that we can't control if
1129         // this string is translated or not.
1130         if ('reason' in e.detail) {
1131             msg = _("New connection has been rejected with reason: ") +
1132                 e.detail.reason;
1133         } else {
1134             msg = _("New connection has been rejected");
1135         }
1136         UI.showStatus(msg, 'error');
1137     },
1138
1139 /* ------^-------
1140  *  /CONNECTION
1141  * ==============
1142  *   PASSWORD
1143  * ------v------*/
1144
1145     credentials: function(e) {
1146         // FIXME: handle more types
1147         document.getElementById('noVNC_password_dlg')
1148             .classList.add('noVNC_open');
1149
1150         setTimeout(function () {
1151                 document.getElementById('noVNC_password_input').focus();
1152             }, 100);
1153
1154         Log.Warn("Server asked for a password");
1155         UI.showStatus(_("Password is required"), "warning");
1156     },
1157
1158     setPassword: function(e) {
1159         // Prevent actually submitting the form
1160         e.preventDefault();
1161
1162         var inputElem = document.getElementById('noVNC_password_input');
1163         var password = inputElem.value;
1164         // Clear the input after reading the password
1165         inputElem.value = "";
1166         UI.rfb.sendCredentials({ password: password });
1167         UI.reconnect_password = password;
1168         document.getElementById('noVNC_password_dlg')
1169             .classList.remove('noVNC_open');
1170     },
1171
1172 /* ------^-------
1173  *  /PASSWORD
1174  * ==============
1175  *   FULLSCREEN
1176  * ------v------*/
1177
1178     toggleFullscreen: function() {
1179         if (document.fullscreenElement || // alternative standard method
1180             document.mozFullScreenElement || // currently working methods
1181             document.webkitFullscreenElement ||
1182             document.msFullscreenElement) {
1183             if (document.exitFullscreen) {
1184                 document.exitFullscreen();
1185             } else if (document.mozCancelFullScreen) {
1186                 document.mozCancelFullScreen();
1187             } else if (document.webkitExitFullscreen) {
1188                 document.webkitExitFullscreen();
1189             } else if (document.msExitFullscreen) {
1190                 document.msExitFullscreen();
1191             }
1192         } else {
1193             if (document.documentElement.requestFullscreen) {
1194                 document.documentElement.requestFullscreen();
1195             } else if (document.documentElement.mozRequestFullScreen) {
1196                 document.documentElement.mozRequestFullScreen();
1197             } else if (document.documentElement.webkitRequestFullscreen) {
1198                 document.documentElement.webkitRequestFullscreen(Element.ALLOW_KEYBOARD_INPUT);
1199             } else if (document.body.msRequestFullscreen) {
1200                 document.body.msRequestFullscreen();
1201             }
1202         }
1203         UI.enableDisableViewClip();
1204         UI.updateFullscreenButton();
1205     },
1206
1207     updateFullscreenButton: function() {
1208         if (document.fullscreenElement || // alternative standard method
1209             document.mozFullScreenElement || // currently working methods
1210             document.webkitFullscreenElement ||
1211             document.msFullscreenElement ) {
1212             document.getElementById('noVNC_fullscreen_button')
1213                 .classList.add("noVNC_selected");
1214         } else {
1215             document.getElementById('noVNC_fullscreen_button')
1216                 .classList.remove("noVNC_selected");
1217         }
1218     },
1219
1220 /* ------^-------
1221  *  /FULLSCREEN
1222  * ==============
1223  *     RESIZE
1224  * ------v------*/
1225
1226     // Apply remote resizing or local scaling
1227     applyResizeMode: function() {
1228         if (!UI.rfb) return;
1229
1230         UI.rfb.scaleViewport = UI.getSetting('resize') === 'scale';
1231         UI.rfb.resizeSession = UI.getSetting('resize') === 'remote';
1232     },
1233
1234 /* ------^-------
1235  *    /RESIZE
1236  * ==============
1237  * VIEW CLIPPING
1238  * ------v------*/
1239
1240     // Update parameters that depend on the viewport clip setting
1241     updateViewClip: function() {
1242         if (!UI.rfb) return;
1243
1244         var cur_clip = UI.rfb.clipViewport;
1245         var new_clip = UI.getSetting('view_clip');
1246
1247         if (isTouchDevice) {
1248             // Touch devices usually have shit scrollbars
1249             new_clip = true;
1250         }
1251
1252         if (cur_clip !== new_clip) {
1253             UI.rfb.clipViewport = new_clip;
1254         }
1255
1256         // Changing the viewport may change the state of
1257         // the dragging button
1258         UI.updateViewDrag();
1259     },
1260
1261     // Handle special cases where viewport clipping is forced on/off or locked
1262     enableDisableViewClip: function() {
1263         var resizeSetting = UI.getSetting('resize');
1264         // Disable clipping if we are scaling, connected or on touch
1265         if (resizeSetting === 'scale' ||
1266             isTouchDevice) {
1267             UI.disableSetting('view_clip');
1268         } else {
1269             UI.enableSetting('view_clip');
1270         }
1271     },
1272
1273 /* ------^-------
1274  * /VIEW CLIPPING
1275  * ==============
1276  *    VIEWDRAG
1277  * ------v------*/
1278
1279     toggleViewDrag: function() {
1280         if (!UI.rfb) return;
1281
1282         var drag = UI.rfb.dragViewport;
1283         UI.setViewDrag(!drag);
1284      },
1285
1286     // Set the view drag mode which moves the viewport on mouse drags
1287     setViewDrag: function(drag) {
1288         if (!UI.rfb) return;
1289
1290         UI.rfb.dragViewport = drag;
1291
1292         UI.updateViewDrag();
1293     },
1294
1295     updateViewDrag: function() {
1296         if (!UI.connected) return;
1297
1298         var viewDragButton = document.getElementById('noVNC_view_drag_button');
1299
1300         if (!UI.rfb.clipViewport && UI.rfb.dragViewport) {
1301             // We are no longer clipping the viewport. Make sure
1302             // viewport drag isn't active when it can't be used.
1303             UI.rfb.dragViewport = false;
1304         }
1305
1306         if (UI.rfb.dragViewport) {
1307             viewDragButton.classList.add("noVNC_selected");
1308         } else {
1309             viewDragButton.classList.remove("noVNC_selected");
1310         }
1311
1312         // Different behaviour for touch vs non-touch
1313         // The button is disabled instead of hidden on touch devices
1314         if (isTouchDevice) {
1315             viewDragButton.classList.remove("noVNC_hidden");
1316
1317             if (UI.rfb.clipViewport) {
1318                 viewDragButton.disabled = false;
1319             } else {
1320                 viewDragButton.disabled = true;
1321             }
1322         } else {
1323             viewDragButton.disabled = false;
1324
1325             if (UI.rfb.clipViewport) {
1326                 viewDragButton.classList.remove("noVNC_hidden");
1327             } else {
1328                 viewDragButton.classList.add("noVNC_hidden");
1329             }
1330         }
1331     },
1332
1333 /* ------^-------
1334  *   /VIEWDRAG
1335  * ==============
1336  *    KEYBOARD
1337  * ------v------*/
1338
1339     showVirtualKeyboard: function() {
1340         if (!isTouchDevice) return;
1341
1342         var input = document.getElementById('noVNC_keyboardinput');
1343
1344         if (document.activeElement == input) return;
1345
1346         input.focus();
1347
1348         try {
1349             var l = input.value.length;
1350             // Move the caret to the end
1351             input.setSelectionRange(l, l);
1352         } catch (err) {} // setSelectionRange is undefined in Google Chrome
1353     },
1354
1355     hideVirtualKeyboard: function() {
1356         if (!isTouchDevice) return;
1357
1358         var input = document.getElementById('noVNC_keyboardinput');
1359
1360         if (document.activeElement != input) return;
1361
1362         input.blur();
1363     },
1364
1365     toggleVirtualKeyboard: function () {
1366         if (document.getElementById('noVNC_keyboard_button')
1367             .classList.contains("noVNC_selected")) {
1368             UI.hideVirtualKeyboard();
1369         } else {
1370             UI.showVirtualKeyboard();
1371         }
1372     },
1373
1374     onfocusVirtualKeyboard: function(event) {
1375         document.getElementById('noVNC_keyboard_button')
1376             .classList.add("noVNC_selected");
1377         if (UI.rfb) {
1378             UI.rfb.focusOnClick = false;
1379         }
1380     },
1381
1382     onblurVirtualKeyboard: function(event) {
1383         document.getElementById('noVNC_keyboard_button')
1384             .classList.remove("noVNC_selected");
1385         if (UI.rfb) {
1386             UI.rfb.focusOnClick = true;
1387         }
1388     },
1389
1390     keepVirtualKeyboard: function(event) {
1391         var input = document.getElementById('noVNC_keyboardinput');
1392
1393         // Only prevent focus change if the virtual keyboard is active
1394         if (document.activeElement != input) {
1395             return;
1396         }
1397
1398         // Only allow focus to move to other elements that need
1399         // focus to function properly
1400         if (event.target.form !== undefined) {
1401             switch (event.target.type) {
1402                 case 'text':
1403                 case 'email':
1404                 case 'search':
1405                 case 'password':
1406                 case 'tel':
1407                 case 'url':
1408                 case 'textarea':
1409                 case 'select-one':
1410                 case 'select-multiple':
1411                     return;
1412             }
1413         }
1414
1415         event.preventDefault();
1416     },
1417
1418     keyboardinputReset: function() {
1419         var kbi = document.getElementById('noVNC_keyboardinput');
1420         kbi.value = new Array(UI.defaultKeyboardinputLen).join("_");
1421         UI.lastKeyboardinput = kbi.value;
1422     },
1423
1424     keyEvent: function (keysym, code, down) {
1425         if (!UI.rfb) return;
1426
1427         UI.rfb.sendKey(keysym, code, down);
1428     },
1429
1430     // When normal keyboard events are left uncought, use the input events from
1431     // the keyboardinput element instead and generate the corresponding key events.
1432     // This code is required since some browsers on Android are inconsistent in
1433     // sending keyCodes in the normal keyboard events when using on screen keyboards.
1434     keyInput: function(event) {
1435
1436         if (!UI.rfb) return;
1437
1438         var newValue = event.target.value;
1439
1440         if (!UI.lastKeyboardinput) {
1441             UI.keyboardinputReset();
1442         }
1443         var oldValue = UI.lastKeyboardinput;
1444
1445         var newLen;
1446         try {
1447             // Try to check caret position since whitespace at the end
1448             // will not be considered by value.length in some browsers
1449             newLen = Math.max(event.target.selectionStart, newValue.length);
1450         } catch (err) {
1451             // selectionStart is undefined in Google Chrome
1452             newLen = newValue.length;
1453         }
1454         var oldLen = oldValue.length;
1455
1456         var backspaces;
1457         var inputs = newLen - oldLen;
1458         if (inputs < 0) {
1459             backspaces = -inputs;
1460         } else {
1461             backspaces = 0;
1462         }
1463
1464         // Compare the old string with the new to account for
1465         // text-corrections or other input that modify existing text
1466         var i;
1467         for (i = 0; i < Math.min(oldLen, newLen); i++) {
1468             if (newValue.charAt(i) != oldValue.charAt(i)) {
1469                 inputs = newLen - i;
1470                 backspaces = oldLen - i;
1471                 break;
1472             }
1473         }
1474
1475         // Send the key events
1476         for (i = 0; i < backspaces; i++) {
1477             UI.rfb.sendKey(KeyTable.XK_BackSpace, "Backspace");
1478         }
1479         for (i = newLen - inputs; i < newLen; i++) {
1480             UI.rfb.sendKey(keysyms.lookup(newValue.charCodeAt(i)));
1481         }
1482
1483         // Control the text content length in the keyboardinput element
1484         if (newLen > 2 * UI.defaultKeyboardinputLen) {
1485             UI.keyboardinputReset();
1486         } else if (newLen < 1) {
1487             // There always have to be some text in the keyboardinput
1488             // element with which backspace can interact.
1489             UI.keyboardinputReset();
1490             // This sometimes causes the keyboard to disappear for a second
1491             // but it is required for the android keyboard to recognize that
1492             // text has been added to the field
1493             event.target.blur();
1494             // This has to be ran outside of the input handler in order to work
1495             setTimeout(event.target.focus.bind(event.target), 0);
1496         } else {
1497             UI.lastKeyboardinput = newValue;
1498         }
1499     },
1500
1501 /* ------^-------
1502  *   /KEYBOARD
1503  * ==============
1504  *   EXTRA KEYS
1505  * ------v------*/
1506
1507     openExtraKeys: function() {
1508         UI.closeAllPanels();
1509         UI.openControlbar();
1510
1511         document.getElementById('noVNC_modifiers')
1512             .classList.add("noVNC_open");
1513         document.getElementById('noVNC_toggle_extra_keys_button')
1514             .classList.add("noVNC_selected");
1515     },
1516
1517     closeExtraKeys: function() {
1518         document.getElementById('noVNC_modifiers')
1519             .classList.remove("noVNC_open");
1520         document.getElementById('noVNC_toggle_extra_keys_button')
1521             .classList.remove("noVNC_selected");
1522     },
1523
1524     toggleExtraKeys: function() {
1525         if(document.getElementById('noVNC_modifiers')
1526             .classList.contains("noVNC_open")) {
1527             UI.closeExtraKeys();
1528         } else  {
1529             UI.openExtraKeys();
1530         }
1531     },
1532
1533     sendEsc: function() {
1534         UI.rfb.sendKey(KeyTable.XK_Escape, "Escape");
1535     },
1536
1537     sendTab: function() {
1538         UI.rfb.sendKey(KeyTable.XK_Tab);
1539     },
1540
1541     toggleCtrl: function() {
1542         var btn = document.getElementById('noVNC_toggle_ctrl_button');
1543         if (btn.classList.contains("noVNC_selected")) {
1544             UI.rfb.sendKey(KeyTable.XK_Control_L, "ControlLeft", false);
1545             btn.classList.remove("noVNC_selected");
1546         } else {
1547             UI.rfb.sendKey(KeyTable.XK_Control_L, "ControlLeft", true);
1548             btn.classList.add("noVNC_selected");
1549         }
1550     },
1551
1552     toggleAlt: function() {
1553         var btn = document.getElementById('noVNC_toggle_alt_button');
1554         if (btn.classList.contains("noVNC_selected")) {
1555             UI.rfb.sendKey(KeyTable.XK_Alt_L, "AltLeft", false);
1556             btn.classList.remove("noVNC_selected");
1557         } else {
1558             UI.rfb.sendKey(KeyTable.XK_Alt_L, "AltLeft", true);
1559             btn.classList.add("noVNC_selected");
1560         }
1561     },
1562
1563     sendCtrlAltDel: function() {
1564         UI.rfb.sendCtrlAltDel();
1565     },
1566
1567 /* ------^-------
1568  *   /EXTRA KEYS
1569  * ==============
1570  *     MISC
1571  * ------v------*/
1572
1573     setMouseButton: function(num) {
1574         var view_only = UI.rfb.viewOnly;
1575         if (UI.rfb && !view_only) {
1576             UI.rfb.touchButton = num;
1577         }
1578
1579         var blist = [0, 1,2,4];
1580         for (var b = 0; b < blist.length; b++) {
1581             var button = document.getElementById('noVNC_mouse_button' +
1582                                                  blist[b]);
1583             if (blist[b] === num && !view_only) {
1584                 button.classList.remove("noVNC_hidden");
1585             } else {
1586                 button.classList.add("noVNC_hidden");
1587             }
1588         }
1589     },
1590
1591     updateViewOnly: function() {
1592         if (!UI.rfb) return;
1593         UI.rfb.viewOnly = UI.getSetting('view_only');
1594
1595         // Hide input related buttons in view only mode
1596         if (UI.rfb.viewOnly) {
1597             document.getElementById('noVNC_keyboard_button')
1598                 .classList.add('noVNC_hidden');
1599             document.getElementById('noVNC_toggle_extra_keys_button')
1600                 .classList.add('noVNC_hidden');
1601         } else {
1602             document.getElementById('noVNC_keyboard_button')
1603                 .classList.remove('noVNC_hidden');
1604             document.getElementById('noVNC_toggle_extra_keys_button')
1605                 .classList.remove('noVNC_hidden');
1606         }
1607         UI.setMouseButton(1); //has it's own logic for hiding/showing
1608     },
1609
1610     updateLogging: function() {
1611         WebUtil.init_logging(UI.getSetting('logging'));
1612     },
1613
1614     updateDesktopName: function(e) {
1615         UI.desktopName = e.detail.name;
1616         // Display the desktop name in the document title
1617         document.title = e.detail.name + " - noVNC";
1618     },
1619
1620     bell: function(e) {
1621         if (WebUtil.getConfigVar('bell', 'on') === 'on') {
1622             var promise = document.getElementById('noVNC_bell').play();
1623             // The standards disagree on the return value here
1624             if (promise) {
1625                 promise.catch(function(e) {
1626                     if (e.name === "NotAllowedError") {
1627                         // Ignore when the browser doesn't let us play audio.
1628                         // It is common that the browsers require audio to be
1629                         // initiated from a user action.
1630                     } else {
1631                         Log.Error("Unable to play bell: " + e);
1632                     }
1633                 });
1634             }
1635         }
1636     },
1637
1638     //Helper to add options to dropdown.
1639     addOption: function(selectbox, text, value) {
1640         var optn = document.createElement("OPTION");
1641         optn.text = text;
1642         optn.value = value;
1643         selectbox.options.add(optn);
1644     },
1645
1646 /* ------^-------
1647  *    /MISC
1648  * ==============
1649  */
1650 };
1651
1652 // Set up translations
1653 var LINGUAS = ["de", "el", "es", "nl", "pl", "sv", "tr", "zh"];
1654 l10n.setup(LINGUAS);
1655 if (l10n.language !== "en" && l10n.dictionary === undefined) {
1656     WebUtil.fetchJSON('app/locale/' + l10n.language + '.json', function (translations) {
1657         l10n.dictionary = translations;
1658
1659         // wait for translations to load before loading the UI
1660         UI.prime();
1661     }, function (err) {
1662         Log.Error("Failed to load translations: " + err);
1663         UI.prime();
1664     });
1665 } else {
1666     UI.prime();
1667 }
1668
1669 export default UI;