com.vaadin.flow.server.

Annotation Type PWA


  • @Retention(value=RUNTIME)
 @Target(value=TYPE)
public @interface PWA

    Defines application PWA properties. Annotation activates automatic PWA injecting.

    Only one annotation for application is supported. Annotation must be placed to master layout. Application annotated the annotation will add following capabilities to Flow application:

    • handle manifest.webmanifest
    • handle sw.js (service worker), which will enable simple offline fallback and file caching
    • handle default (static) offline html page
    • handle different versions (sizes) of the given logo
    • inject needed tags to the app's page header
    Any of the handled resources can be explicitly overridden with static file in public resources. For example, if manifest.webmanifest is available in webapp root folder it will be served instead of generated manifest.webmanifest. Same applies for service worker and generated icons.

    See Also:

    https://developer.mozilla.org/en-US/Apps/Progressive

    • Element Detail

      • name

        public abstract String name

        Name of the application.

        Returns:

        name of the application

      • shortName

        public abstract String shortName

        Short name for the application. Maximum of 12 characters.

        Returns:

        short name for the application

      • offlinePath

        public abstract String offlinePath

        Path to the static offline html file. Defaults to (relative) offline.html with default configuration that is webapp/offline.html If offline file is not found, falls back to default offline page.

        Returns:

        path to the static offline html file

        Default:

        "offline.html"

      • manifestPath

        public abstract String manifestPath

        Path to the manifest file. Defaults to (relative) manifest.webmanifest with default configuration that is webapp/manifest.webmanifest

        Returns:

        path to the manifest file

        Default:

        "manifest.webmanifest"

      • iconPath

        public abstract String iconPath

        Path to the application icon file.

        Defaults to (relative) icons/icon.png with default configuration that is webapp/manifest.webmanifest

        If the specified icon file is not found, the default one will be used. The file is also used to create different sizes of icon.

        Returns:

        path to the application icon file

        Default:

        "icons/icon.png"

      • startPath

        public abstract String startPath

        (Root relative) start url, used in web-manifest, property start_url

        Used in manifest as start_url of application. Must be relative to root context. ie. If install address of application would be https://foo.bar.org/sub/ and wanted start url would be https://foo.bar.org/sub/pwa-start then value of startPath would be "pwa-start" (without leading "/").

        Defaults to root of application.

        Returns:

        application start url

        Default:

        ""

      • description

        public abstract String description

        Description of the application.

        Returns:

        description of the application

        Default:

        ""

      • themeColor

        public abstract String themeColor

        Theme color of the application. The theme color sets the color of the application's tool bar and application's color in the task switcher.

        Returns:

        theme color of the application

        Default:

        "#ffffff"

      • backgroundColor

        public abstract String backgroundColor

        Background color of the application. The background color property is used on the splash screen when the application is first launched.

        Returns:

        Background color of the application

        Default:

        "#f2f2f2"

      • display

        public abstract String display

        Defines the developers? preferred display mode for the website. Possible values: fullscreen, standalone, minimal-ui, browser

        Returns:

        display mode of application

        Default:

        "standalone"

      • offlineResources

        public abstract String[] offlineResources

        Offline resources to be cached using the service worker.

        Returns:

        offline resources to be cached

        Default:

        {}

      • enableInstallPrompt

        public abstract boolean enableInstallPrompt

        If enabled, server will inject default pwa -install prompt html and js in bootstrap page.

        Will capture beforeinstallprompt -event and show install prompt as required from Chrome 68 upwards.

        Returns:

        are pwa -install prompt resources injected.

        Default:

        true