core/util/browser.js

   1 /*
   2  * noVNC: HTML5 VNC client
   3  * Copyright (C) 2018 The noVNC Authors
   4  * Licensed under MPL 2.0 (see LICENSE.txt)
   5  *
   6  * See README.md for usage and integration instructions.
   7  */
   8
   9 import * as Log from './logging.js';
  10
  11 // Touch detection
  12 export let isTouchDevice = ('ontouchstart' in document.documentElement) ||
  13                                  // requried for Chrome debugger
  14                                  (document.ontouchstart !== undefined) ||
  15                                  // required for MS Surface
  16                                  (navigator.maxTouchPoints > 0) ||
  17                                  (navigator.msMaxTouchPoints > 0);
  18 window.addEventListener('touchstart', function onFirstTouch() {
  19     isTouchDevice = true;
  20     window.removeEventListener('touchstart', onFirstTouch, false);
  21 }, false);
  22
  23
  24 // The goal is to find a certain physical width, the devicePixelRatio
  25 // brings us a bit closer but is not optimal.
  26 export let dragThreshold = 10 * (window.devicePixelRatio || 1);
  27
  28 let _cursor_uris_supported = null;
  29
  30 export function supportsCursorURIs() {
  31     if (_cursor_uris_supported === null) {
  32         try {
  33             const target = document.createElement('canvas');
  34             target.style.cursor = 'url("data:image/x-icon;base64,AAACAAEACAgAAAIAAgA4AQAAFgAAACgAAAAIAAAAEAAAAAEAIAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAD/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////AAAAAAAAAAAAAAAAAAAAAA==") 2 2, default';
  35
  36             if (target.style.cursor) {
  37                 Log.Info("Data URI scheme cursor supported");
  38                 _cursor_uris_supported = true;
  39             } else {
  40                 Log.Warn("Data URI scheme cursor not supported");
  41                 _cursor_uris_supported = false;
  42             }
  43         } catch (exc) {
  44             Log.Error("Data URI scheme cursor test exception: " + exc);
  45             _cursor_uris_supported = false;
  46         }
  47     }
  48
  49     return _cursor_uris_supported;
  50 }
  51
  52 export function isMac() {
  53     return navigator && !!(/mac/i).exec(navigator.platform);
  54 }
  55
  56 export function isWindows() {
  57     return navigator && !!(/win/i).exec(navigator.platform);
  58 }
  59
  60 export function isIOS() {
  61     return navigator &&
  62            (!!(/ipad/i).exec(navigator.platform) ||
  63             !!(/iphone/i).exec(navigator.platform) ||
  64             !!(/ipod/i).exec(navigator.platform));
  65 }
  66
  67 export function isSafari() {
  68     return navigator && (navigator.userAgent.indexOf('Safari') !== -1 &&
  69                          navigator.userAgent.indexOf('Chrome') === -1);
  70 }
  71
  72 export function isIE() {
  73     return navigator && !!(/trident/i).exec(navigator.userAgent);
  74 }
  75
  76 export function isEdge() {
  77     return navigator && !!(/edge/i).exec(navigator.userAgent);
  78 }
  79
  80 export function isFirefox() {
  81     return navigator && !!(/firefox/i).exec(navigator.userAgent);
  82 }
  83