[[custom-bootstrap-theme]]
= Custom Bootstrap theme

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The Apache Causeway Wicket viewer uses http://getbootstrap.com/[Bootstrap] styles and components, courtesy of the https://github.com/l0rdn1kk0n/wicket-bootstrap[Wicket Bootstrap] integration.

By default the viewer uses the default bootstrap theme.
It is possible to configure the Wicket viewer to allow the user to xref:vw:ROOT:setup-and-configuration.adoc#themes[select other themes] provided by http://bootswatch.com[bootswatch.com], and if required one of these can be xref:refguide:config:sections/causeway.viewer.wicket.adoc#causeway.viewer.wicket.themes.initial[set as the default].

However, you may instead want to write your own custom theme, for example to fit your company's look-n-feel/interface guidelines.
This is done by implementing https://github.com/l0rdn1kk0n/wicket-bootstrap[Wicket Bootstrap]'s `de.agilecoders.wicket.core.settings.ITheme` class.
This defines:

* the name of the theme
* the resources it needs (the CSS and optional JS and/or fonts), and
* optional urls to load them from a Content Delivery Network (CDN).

To make use of the custom `ITheme` the application should register it by subclassing `CausewayWicketApplication` (also register this in `web.xml`) and add the following snippet:

[source,java]
----

public void init() {
    ...
    IBootstrapSettings settings = new BootstrapSettings();
    ThemeProvider themeProvider = new SingleThemeProvider(new MyTheme());
    settings.setThemeProvider(themeProvider);
    Bootstrap.install(getClass(), settings);
}
----



