tests/org.eclipse.e4.ui.tests.css.swt/src/org/eclipse/e4/ui/tests/css/swt/ThemeTest.java

package org.eclipse.e4.ui.tests.css.swt;

import java.util.Dictionary;
import java.util.Hashtable;

import org.eclipse.e4.ui.css.swt.internal.theme.Theme;
import org.eclipse.e4.ui.css.swt.theme.ITheme;
import org.eclipse.e4.ui.css.swt.theme.IThemeEngine;
import org.eclipse.e4.ui.css.swt.theme.IThemeManager;
import org.eclipse.swt.widgets.Display;
import org.osgi.framework.Bundle;
import org.osgi.framework.BundleContext;
import org.osgi.framework.FrameworkUtil;
import org.osgi.framework.ServiceReference;
import org.osgi.framework.ServiceRegistration;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventConstants;
import org.osgi.service.event.EventHandler;

public class ThemeTest extends CSSSWTTestCase {
	private BundleContext context;
	private ServiceRegistration<EventHandler> themeListenerRegistration;
	private ServiceReference<IThemeManager> themeManagerReference;

	@Override
	public void setUp() throws Exception {
		Bundle b = FrameworkUtil.getBundle(this.getClass());
		assertNotNull("Not running in an OSGi environment", b);
		context = b.getBundleContext();
		assertNotNull("Not running in an OSGi environment", b);
		themeManagerReference = context
				.getServiceReference(IThemeManager.class);
		super.setUp();
	}

	@Override
	public void tearDown() throws Exception {
		themeListenerRegistration.unregister();
		super.tearDown();
	}

	public void testThemeChangeNotification() throws Exception {
		// we don't call createEngine() as ThemeEngine creates its own engine
		final Display display = Display.getDefault();
		final IThemeEngine themer = getThemeEngine(display);
		
		final boolean success[] = new boolean[] { false };

		Dictionary<String, String> properties = new Hashtable<String, String>();
		properties.put(EventConstants.EVENT_TOPIC,
				IThemeEngine.Events.THEME_CHANGED);
		themeListenerRegistration = context.registerService(EventHandler.class, new EventHandler() {
			public void handleEvent(Event event) {
				ITheme theme = (ITheme)event.getProperty(IThemeEngine.Events.THEME);
				success[0] = IThemeEngine.Events.THEME_CHANGED.equals(event.getTopic())
								&& theme != null
								&& theme.getId().equals("test")
								&& event.getProperty(IThemeEngine.Events.DEVICE) == display
								&& event.getProperty(IThemeEngine.Events.THEME_ENGINE) == themer
								&& event.getProperty(IThemeEngine.Events.RESTORE) == Boolean.TRUE;
			}}, properties);

		assertFalse(success[0]);
		themer.setTheme(new Theme("test", "Test"), true);
		assertTrue(success[0]);
	}

	private IThemeEngine getThemeEngine(Display display) {
		IThemeManager manager = context.getService(themeManagerReference);
		assertNotNull("Theme manager service not available", manager);
		return manager.getEngineForDisplay(display);
	}

}