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pwautils.js
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pwautils.js
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/**
* Utilities for Progressive web applications
*/
const bioimagesuiteweb=window.bioimagesuiteweb;
const webutil=bioimagesuiteweb.webutil;
/** Keep track of the install button and related elements */
const internal = {
installElements : null,
deferredInstallPrompt : null,
};
/** Register the service worker
* This code derives from auto-generated code from
* PWABuilder -- www.pwabuilder.com
*/
let registerServiceWorker= function() {
// Register the service worker
if (!navigator.serviceWorker.controller) {
//Register the ServiceWorker
navigator.serviceWorker.register('serviceworker.js', {
scope: './'
}).then(function(reg) {
console.log('++++ Service worker has been registered for scope:'+ reg.scope);
});
}
};
/** Add install button if possible
* @param{Menu} helpmenu - the menu to add the button to
*/
// See https://developers.google.com/web/fundamentals/app-install-banners/
let addInstallButton= function(helpmenu) {
// Add a button to install the application
window.addEventListener('beforeinstallprompt', (evt) => {
evt.preventDefault();
if (internal.installElements===null) {
evt.preventDefault();
// Stash the event so it can be triggered later.
internal.deferredInstallPrompt=evt;
internal.deferredInstallPrompt.userChoice.then((choiceResult) => {
if (choiceResult.outcome === 'accepted') {
internal.deferredInstallPrompt = null;
for (let i=0;i<internal.installElements.length;i++)
internal.installElements[i].remove();
internal.installElements=null;
}
});
internal.installElements= [
webutil.createMenuItem(helpmenu,''), //separator
webutil.createMenuItem(helpmenu,'Install internal Application as PWA',
() => {
internal.deferredInstallPrompt.prompt();
})
];
} else {
internal.deferredInstallPrompt=evt;
}
});
};
// https://stackoverflow.com/questions/52000972/pwa-fixed-screensize
let inPWA=function() {
return (window.matchMedia('(display-mode: standalone)').matches || window.navigator.standalone === true)
}
// Export functions
module.exports = {
addInstallButton,
registerServiceWorker,
inPWA,
};