Parent concept page describes how we should reorganize the widgetset to make it configurable and open for extension. This page highlights the concrete implementation choices (e.g. naming, packaging) that are made to fulfill the concept.
New entries in magnolia-empty-webapp/src/main/webapp/WEB-INF/config/default/magnolia.properties:
This is a custom Vaadin UIProvider. It gets the MagnoliaConfigurationProperties via injection, and checks for property values when queried for widgetset or theme. Vaadin's DefaultUIProvider can only resolve widgetsets and themes either from servlet parameters or via annotation.
Most magnolia property keys are defined as constants in the
SystemProperty deprecated class. For these new properties, we keep the keys where we use them, i.e. in the AdmincentralUIProvider.
It also holds fallback default values in case widgetset and theme cannot be determined:
1. Widgetset fundaments
In order to add custom widgets or Vaadin addons to your Magnolia app, you need to provide a new Widgetset.
Like for any GWT application, there can be only one Widgetset, therefore it should inherit all the Widgetsets you intend to use; in particular it must always inherit Magnolia's default widgetset (identified as info.magnolia.ui.vaadin.gwt.MagnoliaWidgetSet).
Finally, a widgetset must always be GWT-compiled before you run your Web application, and it will have to be recompiled every time the client-side code changes, or when you add that fancy Vaadin addon.
2. Using a custom widgetset in Magnolia
Once your widgetset is compiled, you may now tell magnolia to use it by editing your webapp's magnolia properties, and setting the key magnolia.ui.vaadin.widgetset.
The expected value is a widgetset qualified name as Vaadin expects it, without the .gwt.xml extension, e.g. some.vaadin.package.SomeWidgetset.
Custom app styles
1. Vaadin themes
Module styles are provided as Vaadin themes, generally using Sass.
Like for any Vaadin application, there can be only one Vaadin theme per Vaadin UI (i.e. Magnolia's AdmincentralUI). Therefore it should include all the other themes you intend to use; in particular it must always include Magnolia's default admincentral theme.
Sass themes offer the advantage of being composed from several other Vaadin themes, through Sass mixins. They are ultimately compiled and served as one big chunk of CSS.
2. Using custom styles in your Magnolia app
You can already use custom styles in your Magnolia app, by adding a theme property to your app descriptor, see App theme. However in some cases, you need the styles to be loaded without starting the app (e.g. custom dialog, custom message view).
In that case, once you have your Sass theme ready (includes the admincentralmixin and your custom styles), you may now tell magnolia to use it by editing your webapp's magnolia properties, and setting the key magnolia.ui.vaadin.theme.
The expected value is a theme name as Vaadin expects it, i.e. the name of the theme folder under src/main/resources/VAADIN/themes.