ae1bc396bf
Keep everything simpler by always blitting in the same pixel format. It's up to the decoders to convert if they need to.
112 lines
3.8 KiB
JavaScript
112 lines
3.8 KiB
JavaScript
/*
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* noVNC: HTML5 VNC client
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* Copyright (C) 2019 The noVNC Authors
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* Licensed under MPL 2.0 (see LICENSE.txt)
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*
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* See README.md for usage and integration instructions.
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*
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* Browser feature support detection
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*/
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import * as Log from './logging.js';
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// Touch detection
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export let isTouchDevice = ('ontouchstart' in document.documentElement) ||
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// requried for Chrome debugger
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(document.ontouchstart !== undefined) ||
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// required for MS Surface
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(navigator.maxTouchPoints > 0) ||
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(navigator.msMaxTouchPoints > 0);
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window.addEventListener('touchstart', function onFirstTouch() {
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isTouchDevice = true;
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window.removeEventListener('touchstart', onFirstTouch, false);
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}, false);
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// The goal is to find a certain physical width, the devicePixelRatio
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// brings us a bit closer but is not optimal.
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export let dragThreshold = 10 * (window.devicePixelRatio || 1);
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let _supportsCursorURIs = false;
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try {
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const target = document.createElement('canvas');
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target.style.cursor = 'url("data:image/x-icon;base64,AAACAAEACAgAAAIAAgA4AQAAFgAAACgAAAAIAAAAEAAAAAEAIAAAAAAAEAAAAAAAAAAAAAAAAAAAAAAAAAD/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////AAAAAAAAAAAAAAAAAAAAAA==") 2 2, default';
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if (target.style.cursor.indexOf("url") === 0) {
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Log.Info("Data URI scheme cursor supported");
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_supportsCursorURIs = true;
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} else {
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Log.Warn("Data URI scheme cursor not supported");
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}
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} catch (exc) {
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Log.Error("Data URI scheme cursor test exception: " + exc);
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}
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export const supportsCursorURIs = _supportsCursorURIs;
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let _hasScrollbarGutter = true;
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try {
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// Create invisible container
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const container = document.createElement('div');
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container.style.visibility = 'hidden';
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container.style.overflow = 'scroll'; // forcing scrollbars
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document.body.appendChild(container);
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// Create a div and place it in the container
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const child = document.createElement('div');
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container.appendChild(child);
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// Calculate the difference between the container's full width
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// and the child's width - the difference is the scrollbars
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const scrollbarWidth = (container.offsetWidth - child.offsetWidth);
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// Clean up
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container.parentNode.removeChild(container);
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_hasScrollbarGutter = scrollbarWidth != 0;
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} catch (exc) {
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Log.Error("Scrollbar test exception: " + exc);
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}
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export const hasScrollbarGutter = _hasScrollbarGutter;
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/*
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* The functions for detection of platforms and browsers below are exported
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* but the use of these should be minimized as much as possible.
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*
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* It's better to use feature detection than platform detection.
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*/
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export function isMac() {
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return navigator && !!(/mac/i).exec(navigator.platform);
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}
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export function isWindows() {
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return navigator && !!(/win/i).exec(navigator.platform);
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}
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export function isIOS() {
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return navigator &&
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(!!(/ipad/i).exec(navigator.platform) ||
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!!(/iphone/i).exec(navigator.platform) ||
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!!(/ipod/i).exec(navigator.platform));
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}
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export function isSafari() {
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return navigator && (navigator.userAgent.indexOf('Safari') !== -1 &&
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navigator.userAgent.indexOf('Chrome') === -1);
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}
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export function isIE() {
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return navigator && !!(/trident/i).exec(navigator.userAgent);
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}
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export function isEdge() {
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return navigator && !!(/edge/i).exec(navigator.userAgent);
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}
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export function isFirefox() {
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return navigator && !!(/firefox/i).exec(navigator.userAgent);
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}
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