Eclipse Plug-in Development Beginner's Guide - Second Edition

Time for action – switching between themes

The themes can be switched at runtime by interacting with the IThemeEngine, which can be acquired from the Eclipse 4 runtime service through injection. This provides a list of all installed themes, which can be used to populate the list viewer, and to allow the style to be changed.

1. Create a class called ThemePart in the com.packtpub.e4.application.parts package. Add an injected field IThemeEngine, and a create method annotated with @PostConstruct that takes a Composite parameter:

   public class ThemePart {
     @Inject
     private IThemeEngine themeEngine;
     @PostConstruct
     public void create(Composite parent) {
     }
    }

2. In the create method, add a ListViewer that is associated with an ArrayContentProvider:

   ListViewer lv = ...