完善虚拟机连接

VM/novnc/core/util/browser.js

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+/*
+ * noVNC: HTML5 VNC client
+ * Copyright (C) 2019 The noVNC Authors
+ * Licensed under MPL 2.0 (see LICENSE.txt)
+ *
+ * See README.md for usage and integration instructions.
+ *
+ * Browser feature support detection
+ */
+
+import * as Log from './logging.js';
+
+// Touch detection
+export let isTouchDevice = ('ontouchstart' in document.documentElement) ||
+                                 // requried for Chrome debugger
+                                 (document.ontouchstart !== undefined) ||
+                                 // required for MS Surface
+                                 (navigator.maxTouchPoints > 0) ||
+                                 (navigator.msMaxTouchPoints > 0);
+window.addEventListener('touchstart', function onFirstTouch() {
+    isTouchDevice = true;
+    window.removeEventListener('touchstart', onFirstTouch, false);
+}, false);
+
+
+// The goal is to find a certain physical width, the devicePixelRatio
+// brings us a bit closer but is not optimal.
+export let dragThreshold = 10 * (window.devicePixelRatio || 1);
+
+let _supportsCursorURIs = false;
+
+try {
+    const target = document.createElement('canvas');
+    target.style.cursor = 'url("data:image/x-icon;base64,AAACAAEACAgAAAIAAgA4AQAAFgAAACgAAAAIAAAAEAAAAAEAIAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAD/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////AAAAAAAAAAAAAAAAAAAAAA==") 2 2, default';
+
+    if (target.style.cursor.indexOf("url") === 0) {
+        Log.Info("Data URI scheme cursor supported");
+        _supportsCursorURIs = true;
+    } else {
+        Log.Warn("Data URI scheme cursor not supported");
+    }
+} catch (exc) {
+    Log.Error("Data URI scheme cursor test exception: " + exc);
+}
+
+export const supportsCursorURIs = _supportsCursorURIs;
+
+let _hasScrollbarGutter = true;
+try {
+    // Create invisible container
+    const container = document.createElement('div');
+    container.style.visibility = 'hidden';
+    container.style.overflow = 'scroll'; // forcing scrollbars
+    document.body.appendChild(container);
+
+    // Create a div and place it in the container
+    const child = document.createElement('div');
+    container.appendChild(child);
+
+    // Calculate the difference between the container's full width
+    // and the child's width - the difference is the scrollbars
+    const scrollbarWidth = (container.offsetWidth - child.offsetWidth);
+
+    // Clean up
+    container.parentNode.removeChild(container);
+
+    _hasScrollbarGutter = scrollbarWidth != 0;
+} catch (exc) {
+    Log.Error("Scrollbar test exception: " + exc);
+}
+export const hasScrollbarGutter = _hasScrollbarGutter;
+
+/*
+ * The functions for detection of platforms and browsers below are exported
+ * but the use of these should be minimized as much as possible.
+ *
+ * It's better to use feature detection than platform detection.
+ */
+
+/* OS */
+
+export function isMac() {
+    return !!(/mac/i).exec(navigator.platform);
+}
+
+export function isWindows() {
+    return !!(/win/i).exec(navigator.platform);
+}
+
+export function isIOS() {
+    return (!!(/ipad/i).exec(navigator.platform) ||
+            !!(/iphone/i).exec(navigator.platform) ||
+            !!(/ipod/i).exec(navigator.platform));
+}
+
+export function isAndroid() {
+    /* Android sets navigator.platform to Linux :/ */
+    return !!navigator.userAgent.match('Android ');
+}
+
+export function isChromeOS() {
+    /* ChromeOS sets navigator.platform to Linux :/ */
+    return !!navigator.userAgent.match(' CrOS ');
+}
+
+/* Browser */
+
+export function isSafari() {
+    return !!navigator.userAgent.match('Safari/...') &&
+           !navigator.userAgent.match('Chrome/...') &&
+           !navigator.userAgent.match('Chromium/...') &&
+           !navigator.userAgent.match('Epiphany/...');
+}
+
+export function isFirefox() {
+    return !!navigator.userAgent.match('Firefox/...') &&
+           !navigator.userAgent.match('Seamonkey/...');
+}
+
+export function isChrome() {
+    return !!navigator.userAgent.match('Chrome/...') &&
+           !navigator.userAgent.match('Chromium/...') &&
+           !navigator.userAgent.match('Edg/...') &&
+           !navigator.userAgent.match('OPR/...');
+}
+
+export function isChromium() {
+    return !!navigator.userAgent.match('Chromium/...');
+}
+
+export function isOpera() {
+    return !!navigator.userAgent.match('OPR/...');
+}
+
+export function isEdge() {
+    return !!navigator.userAgent.match('Edg/...');
+}
+
+/* Engine */
+
+export function isGecko() {
+    return !!navigator.userAgent.match('Gecko/...');
+}
+
+export function isWebKit() {
+    return !!navigator.userAgent.match('AppleWebKit/...') &&
+           !navigator.userAgent.match('Chrome/...');
+}
+
+export function isBlink() {
+    return !!navigator.userAgent.match('Chrome/...');
+}