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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.
*/
export function isMac() {
return navigator && !!(/mac/i).exec(navigator.platform);
}
export function isWindows() {
return navigator && !!(/win/i).exec(navigator.platform);
}
export function isIOS() {
return navigator &&
(!!(/ipad/i).exec(navigator.platform) ||
!!(/iphone/i).exec(navigator.platform) ||
!!(/ipod/i).exec(navigator.platform));
}
export function isSafari() {
return navigator && (navigator.userAgent.indexOf('Safari') !== -1 &&
navigator.userAgent.indexOf('Chrome') === -1);
}
export function isFirefox() {
return navigator && !!(/firefox/i).exec(navigator.userAgent);
}
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