ohif-viewer/Packages/viewerbase/lib/isTouchDevice.js

/**
 * Helper function to determine if the current client devices
 * is touch-capable. This can be used to modify certain aspects of the UI.
 *
 * The check may not work on all devices!
 *
 * @returns {boolean} true if the client device is touch-capable, false otherwise
 */
isTouchDevice = function() {
    return (('ontouchstart' in window)  ||
        (navigator.MaxTouchPoints > 0) ||
        (navigator.msMaxTouchPoints > 0));
};