bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/themes/WorkbenchThemeManager.java - platform/eclipse.platform.ui - Git at Google

 /*******************************************************************************
  * Copyright (c) 2004, 2016 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  *     IBM Corporation - initial API and implementation
  *******************************************************************************/
 package org.eclipse.ui.internal.themes;

 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 import org.eclipse.core.commands.common.EventManager;
 import org.eclipse.core.runtime.Platform;
 import org.eclipse.e4.core.contexts.IEclipseContext;
 import org.eclipse.e4.core.services.events.IEventBroker;
 import org.eclipse.e4.ui.css.swt.theme.IThemeEngine;
 import org.eclipse.e4.ui.internal.css.swt.definition.IThemeElementDefinitionOverridable;
 import org.eclipse.e4.ui.model.application.MApplication;
 import org.eclipse.e4.ui.services.IStylingEngine;
 import org.eclipse.e4.ui.workbench.UIEvents;
 import org.eclipse.jface.preference.IPreferenceStore;
 import org.eclipse.jface.preference.PreferenceConverter;
 import org.eclipse.jface.resource.ColorRegistry;
 import org.eclipse.jface.resource.FontRegistry;
 import org.eclipse.jface.resource.JFaceResources;
 import org.eclipse.jface.util.IPropertyChangeListener;
 import org.eclipse.jface.util.PropertyChangeEvent;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.graphics.FontData;
 import org.eclipse.swt.graphics.RGB;
 import org.eclipse.swt.widgets.Display;
 import org.eclipse.ui.IWorkbenchPreferenceConstants;
 import org.eclipse.ui.PlatformUI;
 import org.eclipse.ui.internal.Workbench;
 import org.eclipse.ui.internal.WorkbenchPlugin;
 import org.eclipse.ui.internal.misc.StatusUtil;
 import org.eclipse.ui.internal.util.PrefUtil;
 import org.eclipse.ui.statushandlers.StatusManager;
 import org.eclipse.ui.themes.ITheme;
 import org.eclipse.ui.themes.IThemeManager;
 import org.osgi.service.event.EventHandler;

 /**
  * Theme manager for the Workbench.
  *
  * @since 3.0
  */
 public class WorkbenchThemeManager extends EventManager implements
 		IThemeManager {
 	public static RGB EMPTY_COLOR_VALUE = new RGB(0, 1, 2);

 	private static final String SYSTEM_DEFAULT_THEME = "org.eclipse.ui.ide.systemDefault";//$NON-NLS-1$

 	private static WorkbenchThemeManager instance;

 	private IEclipseContext context;

 	private IEventBroker eventBroker;

 	public static interface Events {
 		public static final String TOPIC = "org/eclipse/ui/internal/themes/WorkbenchThemeManager"; //$NON-NLS-1$

 		public static final String THEME_REGISTRY_RESTYLED = TOPIC + "/themeRegistryRestyled"; //$NON-NLS-1$

 		public static final String THEME_REGISTRY_MODIFIED = TOPIC + "/themeRegistryModified"; //$NON-NLS-1$
 	}

 	/**
 	 * Returns the singelton instance of the WorkbenchThemeManager
 	 *
 	 * @return singleton instance
 	 */
 	public static synchronized WorkbenchThemeManager getInstance() {
 		if (instance == null) {
 			instance = new WorkbenchThemeManager();
 		}
 		return instance;
 	}


 	private ITheme currentTheme;

 	private IPropertyChangeListener currentThemeListener = event -> {
 		firePropertyChange(event);
 		if (event.getSource() instanceof FontRegistry) {
 			JFaceResources.getFontRegistry().put(event.getProperty(),
 					(FontData[]) event.getNewValue());
 		} else if (event.getSource() instanceof ColorRegistry) {
 			JFaceResources.getColorRegistry().put(event.getProperty(),
 					(RGB) event.getNewValue());
 		}
 	};

 	private ColorRegistry defaultThemeColorRegistry;

 	private FontRegistry defaultThemeFontRegistry;

 	private IThemeRegistry themeRegistry;

 	private Map themes = new HashMap(7);

 	private EventHandler themeChangedHandler = new WorkbenchThemeChangedHandler();

 	private EventHandler themeRegistryModifiedHandler = new ThemeRegistryModifiedHandler();

 	private boolean initialized = false;

 	private WorkbenchThemeManager() {
 	}

 	/*
 	 * Initialize the WorkbenchThemeManager.
 	 * Determine the default theme according to the following rules:
 	 *   1) If we're in HC mode then default to system default
 	 *   2) Otherwise, if preference already set (e.g. via plugin_customization.ini), then observe that value
 	 *   3) Otherwise, use our default
 	 * Call dispose when we close.
 	 */
 	private synchronized void init() {
 		if (initialized) {
 			return;
 		}
 		initialized = true;
 		defaultThemeColorRegistry = new ColorRegistry(PlatformUI.getWorkbench()
 				.getDisplay());

 		defaultThemeFontRegistry = new FontRegistry(PlatformUI.getWorkbench()
 				.getDisplay());

 		// copy the font values from preferences.
 		FontRegistry jfaceFonts = JFaceResources.getFontRegistry();
 		for (Object fontRegistryKey : jfaceFonts.getKeySet()) {
 			String key = (String) fontRegistryKey;
 			defaultThemeFontRegistry.put(key, jfaceFonts.getFontData(key));
 		}

 		//Theme might be set via plugin_configuration.ini
 		String themeId = PrefUtil.getAPIPreferenceStore().getDefaultString(IWorkbenchPreferenceConstants.CURRENT_THEME_ID);

 		//If not set, use default
 		if (themeId.length() == 0)
 			themeId = IThemeManager.DEFAULT_THEME;

 		final boolean highContrast = Display.getCurrent().getHighContrast();

 		Display.getCurrent().addListener(SWT.Settings, event -> updateThemes());

 		// If in HC, *always* use the system default.
 		// This ignores any default theme set via plugin_customization.ini
 		if (highContrast)
 			themeId = SYSTEM_DEFAULT_THEME;

 		PrefUtil.getAPIPreferenceStore().setDefault(
 				IWorkbenchPreferenceConstants.CURRENT_THEME_ID, themeId);

 		context = Workbench.getInstance().getService(IEclipseContext.class);
 		eventBroker = Workbench.getInstance().getService(IEventBroker.class);
 		if (eventBroker != null) {
 			eventBroker.subscribe(UIEvents.UILifeCycle.THEME_CHANGED, themeChangedHandler);
 			eventBroker.subscribe(IThemeEngine.Events.THEME_CHANGED, themeChangedHandler);
 			eventBroker.subscribe(Events.THEME_REGISTRY_MODIFIED, themeRegistryModifiedHandler);
 		}
 		getCurrentTheme(); // initialize the current theme
 	}

 	/*
 	 * Update existing theme contents, descriptors, and registries.
 	 * Reread the themes and recompute the registries.
 	 */
 	private void updateThemes() {
 		//reread the themes since their descriptors have changed in value
         ThemeRegistryReader reader = new ThemeRegistryReader();
         reader.readThemes(Platform.getExtensionRegistry(),(ThemeRegistry) getThemeRegistry());

         //DEFAULT_THEME is not in getThemes() list so must be handled special
         ThemeElementHelper.populateRegistry(getTheme(IThemeManager.DEFAULT_THEME), getThemeRegistry().getColors(), PrefUtil.getInternalPreferenceStore());

         IThemeDescriptor[] themeDescriptors = getThemeRegistry().getThemes();

        	for (IThemeDescriptor themeDescriptor : themeDescriptors) {
         	ITheme theme = (ITheme) themes.get(themeDescriptor);
     		//If theme is in our themes table then its already been populated
     		if (theme != null) {
                 ColorDefinition[] colorDefinitions = themeDescriptor.getColors();

                if (colorDefinitions.length > 0) {
                 	ThemeElementHelper.populateRegistry(theme, colorDefinitions,PrefUtil.getInternalPreferenceStore());
                 }
     		}
 		}
 	}
 	@Override
 	public void addPropertyChangeListener(IPropertyChangeListener listener) {
 		addListenerObject(listener);
 	}

 	/**
 	 * Disposes all ThemeEntries.
 	 */
 	public void dispose() {
 		if (eventBroker != null) {
 			eventBroker.unsubscribe(themeChangedHandler);
 			eventBroker.unsubscribe(themeRegistryModifiedHandler);
 		}

 		for (Iterator i = themes.values().iterator(); i.hasNext();) {
 			ITheme theme = (ITheme) i.next();
 			theme.removePropertyChangeListener(currentThemeListener);
 			theme.dispose();
 		}
 		themes.clear();
 	}

 	private boolean doSetCurrentTheme(String id) {
 		ITheme oldTheme = currentTheme;
 		ITheme newTheme = getTheme(id);
 		if (oldTheme != newTheme && newTheme != null) {
 			currentTheme = newTheme;
 			return true;
 		}

 		return false;
 	}

 	protected void firePropertyChange(PropertyChangeEvent event) {
 		for (Object listener : getListeners()) {
 			((IPropertyChangeListener) listener).propertyChange(event);
 		}
 	}

 	protected void firePropertyChange(String changeId, ITheme oldTheme,
 			ITheme newTheme) {

 		PropertyChangeEvent event = new PropertyChangeEvent(this, changeId,
 				oldTheme, newTheme);
 		firePropertyChange(event);
 	}

 	@Override
 	public ITheme getCurrentTheme() {
 		init();
 		if (currentTheme == null) {
 			String themeId = PrefUtil.getAPIPreferenceStore().getString(
 					IWorkbenchPreferenceConstants.CURRENT_THEME_ID);

 			if (themeId == null) // missing preference
 				setCurrentTheme(IThemeManager.DEFAULT_THEME);
 			else {
 				setCurrentTheme(themeId);
 				if (currentTheme == null) { // still null - the preference
 											// didn't resolve to a proper theme
 					setCurrentTheme(IThemeManager.DEFAULT_THEME);
 					StatusManager
 							.getManager()
 							.handle(
 									StatusUtil
 											.newStatus(
 													PlatformUI.PLUGIN_ID,
 													"Could not restore current theme: " + themeId, null)); //$NON-NLS-1$
 				}
 			}
 		}
 		return currentTheme;
 	}

 	/**
 	 * Return the default color registry.
 	 *
 	 * @return the default color registry
 	 */
 	public ColorRegistry getDefaultThemeColorRegistry() {
 		init();
 		return defaultThemeColorRegistry;
 	}

 	/**
 	 * Return the default font registry.
 	 *
 	 * @return the default font registry
 	 */
 	public FontRegistry getDefaultThemeFontRegistry() {
 		init();
 		return defaultThemeFontRegistry;
 	}

 	private ITheme getTheme(IThemeDescriptor td) {
 		ITheme theme = (ITheme) themes.get(td);
 		if (theme == null) {
 			theme = new Theme(td);
 			themes.put(td, theme);
 		}
 		return theme;
 	}

 	@Override
 	public ITheme getTheme(String id) {
 		init();
 		if (id.equals(IThemeManager.DEFAULT_THEME)) {
 			return getTheme((IThemeDescriptor) null);
 		}

 		IThemeDescriptor td = getThemeRegistry().findTheme(id);
 		if (td == null) {
 			return null;
 		}
 		return getTheme(td);
 	}

 	/**
 	 * Answer the IThemeRegistry for the Workbench
 	 */
 	private IThemeRegistry getThemeRegistry() {
 		if (themeRegistry == null) {
 			themeRegistry = WorkbenchPlugin.getDefault().getThemeRegistry();
 		}
 		return themeRegistry;
 	}

 	@Override
 	public void removePropertyChangeListener(IPropertyChangeListener listener) {
 		removeListenerObject(listener);
 	}

 	@Override
 	public void setCurrentTheme(String id) {
 		init();
 		ITheme oldTheme = currentTheme;
 		if (WorkbenchThemeManager.getInstance().doSetCurrentTheme(id)) {
 			firePropertyChange(CHANGE_CURRENT_THEME, oldTheme,
 					getCurrentTheme());
 			if (oldTheme != null) {
 				oldTheme.removePropertyChangeListener(currentThemeListener);
 			}
 			currentTheme.addPropertyChangeListener(currentThemeListener);

 			// update the preference if required.
 			if (!PrefUtil.getAPIPreferenceStore().getString(
 					IWorkbenchPreferenceConstants.CURRENT_THEME_ID).equals(id)) {
 				PrefUtil.getAPIPreferenceStore().setValue(
 						IWorkbenchPreferenceConstants.CURRENT_THEME_ID, id);
 				PrefUtil.saveAPIPrefs();
 			}

 			// update the jface registries
 			{
 				ColorRegistry jfaceColors = JFaceResources.getColorRegistry();
 				ColorRegistry themeColors = currentTheme.getColorRegistry();
 				for (Object themeColorKey : themeColors.getKeySet()) {
 					String key = (String) themeColorKey;
 					jfaceColors.put(key, themeColors.getRGB(key));
 				}
 			}
 			{
 				FontRegistry jfaceFonts = JFaceResources.getFontRegistry();
 				FontRegistry themeFonts = currentTheme.getFontRegistry();
 				for (Object themeFontKey : themeFonts.getKeySet()) {
 					String key = (String) themeFontKey;
 					jfaceFonts.put(key, themeFonts.getFontData(key));
 				}
 			}
 			{
 				if (oldTheme != null && eventBroker != null) {
 					eventBroker.send(UIEvents.UILifeCycle.THEME_CHANGED, null);
 					eventBroker.send(UIEvents.UILifeCycle.THEME_DEFINITION_CHANGED,
 							context.get(MApplication.class.getName()));
 				}
 			}
 		}
 	}

 	public static class WorkbenchThemeChangedHandler implements EventHandler {
 		@Override
 		public void handleEvent(org.osgi.service.event.Event event) {
 			IStylingEngine engine = getStylingEngine();
 			ThemeRegistry themeRegistry = getThemeRegistry();
 			FontRegistry fontRegistry = getFontRegistry();
 			ColorRegistry colorRegistry = getColorRegistry();

 			resetThemeRegistries(themeRegistry, fontRegistry, colorRegistry);
 			overrideAlreadyExistingDefinitions(event, engine, themeRegistry, fontRegistry,
 					colorRegistry);
 			addNewDefinitions(event, engine, themeRegistry, fontRegistry, colorRegistry);

 			sendThemeRegistryRestyledEvent();
 		}

 		protected IStylingEngine getStylingEngine() {
 			return (IStylingEngine) getContext().get(IStylingEngine.SERVICE_NAME);
 		}

 		protected ThemeRegistry getThemeRegistry() {
 			return (ThemeRegistry) getContext().get(IThemeRegistry.class.getName());
 		}

 		protected FontRegistry getFontRegistry() {
 			return getColorsAndFontsTheme().getFontRegistry();
 		}

 		protected ColorRegistry getColorRegistry() {
 			return getColorsAndFontsTheme().getColorRegistry();
 		}

 		protected void sendThemeRegistryRestyledEvent() {
 			IEventBroker eventBroker = (IEventBroker) getContext()
 					.get(IEventBroker.class.getName());
 			eventBroker.send(Events.THEME_REGISTRY_RESTYLED, null);
 		}

 		protected ITheme getColorsAndFontsTheme() {
 			return WorkbenchThemeManager.getInstance().getCurrentTheme();
 		}

 		private IEclipseContext getContext() {
 			return WorkbenchThemeManager.getInstance().context;
 		}

 		protected org.eclipse.e4.ui.css.swt.theme.ITheme getTheme(org.osgi.service.event.Event event) {
 			org.eclipse.e4.ui.css.swt.theme.ITheme theme = (org.eclipse.e4.ui.css.swt.theme.ITheme) event
 					.getProperty(IThemeEngine.Events.THEME);
 			if (theme == null) {
 				IThemeEngine themeEngine = (IThemeEngine) getContext().get(
 						IThemeEngine.class.getName());
 				theme = themeEngine != null ? themeEngine.getActiveTheme() : null;
 			}
 			return theme;
 		}

 		// At this moment we don't remove the definitions added by CSS since we
 		// don't want to modify the 3.x theme registries api
 		protected void resetThemeRegistries(ThemeRegistry themeRegistry, FontRegistry fontRegistry,
 				ColorRegistry colorRegistry) {
 			for (FontDefinition def : themeRegistry.getFonts()) {
 				if (def.isOverridden()) {
 					def.resetToDefaultValue();
 					fontRegistry.put(def.getId(), def.getValue() != null ? def.getValue()
 							: PreferenceConverter.getFontDataArrayDefaultDefault());
 				}
 			}
 			for (ColorDefinition def : themeRegistry.getColors()) {
 				if (def.isOverridden()) {
 					def.resetToDefaultValue();
 					colorRegistry.put(def.getId(), def.getValue() != null ? def.getValue()
 							: EMPTY_COLOR_VALUE);
 				}
 			}
 		}

 		protected void overrideAlreadyExistingDefinitions(org.osgi.service.event.Event event,
 				IStylingEngine engine, ThemeRegistry themeRegistry, FontRegistry fontRegistry,
 				ColorRegistry colorRegistry) {
 			IPreferenceStore store = PrefUtil.getInternalPreferenceStore();
 			org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme = getTheme(event);
 			ITheme theme = getColorsAndFontsTheme();

 			for (FontDefinition fontDefinition : themeRegistry.getFonts()) {
 				engine.style(fontDefinition);
 				if (fontDefinition.isOverridden()) {
 					populateDefinition(cssTheme, theme, fontRegistry, fontDefinition, store);
 					if (!fontDefinition.isModifiedByUser()) {
 						fontRegistry.put(fontDefinition.getId(), fontDefinition.getValue());
 					}
 				}
 			}
 			for (ColorDefinition colorDefinition : themeRegistry.getColors()) {
 				engine.style(colorDefinition);
 				if (colorDefinition.isOverridden()) {
 					populateDefinition(cssTheme, theme, colorRegistry, colorDefinition, store);
 					if (!colorDefinition.isModifiedByUser()) {
 						colorRegistry.put(colorDefinition.getId(), colorDefinition.getValue());
 					}
 				}
 			}
 		}

 		private void addNewDefinitions(org.osgi.service.event.Event event, IStylingEngine engine,
 				ThemeRegistry themeRegistry, FontRegistry fontRegistry, ColorRegistry colorRegistry) {
 			IPreferenceStore store = PrefUtil.getInternalPreferenceStore();
 			org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme = getTheme(event);
 			ITheme theme = getColorsAndFontsTheme();
 			ThemesExtension themesExtension = createThemesExtension();
 			engine.style(themesExtension);

 			for (IThemeElementDefinitionOverridable<?> definition : themesExtension
 					.getDefinitions()) {
 				engine.style(definition);
 				if (definition.isOverridden() && definition instanceof FontDefinition) {
 					addFontDefinition((FontDefinition) definition, themeRegistry, fontRegistry);
 					populateDefinition(cssTheme, theme, fontRegistry, (FontDefinition) definition,
 							store);
 				} else if (definition.isOverridden() && definition instanceof ColorDefinition) {
 					addColorDefinition((ColorDefinition) definition, themeRegistry, colorRegistry);
 					populateDefinition(cssTheme, theme, colorRegistry,
 							(ColorDefinition) definition, store);
 				}
 			}
 		}

 		private void addFontDefinition(FontDefinition definition, ThemeRegistry themeRegistry,
 				FontRegistry fontRegistry) {
 			if (themeRegistry.findFont(definition.getId()) == null) {
 				themeRegistry.add(definition);
 				fontRegistry.put(definition.getId(), definition.getValue());
 			}
 		}

 		private void addColorDefinition(ColorDefinition definition, ThemeRegistry themeRegistry,
 				ColorRegistry colorRegistry) {
 			if (themeRegistry.findColor(definition.getId()) == null) {
 				themeRegistry.add(definition);
 				colorRegistry.put(definition.getId(), definition.getValue());
 			}
 		}

 		protected ThemesExtension createThemesExtension() {
 			return new ThemesExtension();
 		}

 		protected void populateDefinition(org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme,
 				ITheme theme, ColorRegistry registry, ColorDefinition definition,
 				IPreferenceStore store) {
 			ThemeElementHelper.populateDefinition(cssTheme, theme, registry, definition, store);
 		}

 		protected void populateDefinition(org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme,
 				ITheme theme, FontRegistry registry, FontDefinition definition,
 				IPreferenceStore store) {
 			ThemeElementHelper.populateDefinition(cssTheme, theme, registry, definition, store);
 		}
 	}

 	public static class ThemeRegistryModifiedHandler implements EventHandler {
 		@Override
 		public void handleEvent(org.osgi.service.event.Event event) {
 			populateThemeRegistries(getThemeRegistry(), getFontRegistry(), getColorRegistry(),
 					getTheme(), getColorsAndFontsTheme());
 			sendThemeDefinitionChangedEvent();
 		}

 		protected org.eclipse.e4.ui.css.swt.theme.ITheme getTheme() {
 			IThemeEngine themeEngine = (IThemeEngine) getContext()
 					.get(IThemeEngine.class.getName());
 			return themeEngine != null ? themeEngine.getActiveTheme() : null;
 		}

 		protected ThemeRegistry getThemeRegistry() {
 			return (ThemeRegistry) getContext().get(IThemeRegistry.class.getName());
 		}

 		protected FontRegistry getFontRegistry() {
 			return getColorsAndFontsTheme().getFontRegistry();
 		}

 		protected ColorRegistry getColorRegistry() {
 			return getColorsAndFontsTheme().getColorRegistry();
 		}

 		protected ITheme getColorsAndFontsTheme() {
 			return WorkbenchThemeManager.getInstance().getCurrentTheme();
 		}

 		private IEclipseContext getContext() {
 			return WorkbenchThemeManager.getInstance().context;
 		}

 		protected void sendThemeDefinitionChangedEvent() {
 			MApplication application = (MApplication) getContext()
 					.get(MApplication.class.getName());
 			getInstance().eventBroker.send(UIEvents.UILifeCycle.THEME_DEFINITION_CHANGED,
 					application);
 		}

 		protected void populateThemeRegistries(ThemeRegistry themeRegistry,
 				FontRegistry fontRegistry, ColorRegistry colorRegistry,
 				org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme, ITheme theme) {
 			IPreferenceStore store = PrefUtil.getInternalPreferenceStore();
 			for (FontDefinition definition : themeRegistry.getFonts()) {
 				if (definition.isOverridden() || definition.isAddedByCss()) {
 					populateDefinition(cssTheme, theme, fontRegistry, definition, store);
 				}
 			}
 			for (ColorDefinition definition : themeRegistry.getColors()) {
 				if (definition.isOverridden() || definition.isAddedByCss()) {
 					populateDefinition(cssTheme, theme, colorRegistry, definition, store);
 				}
 			}
 		}

 		protected void populateDefinition(org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme,
 				ITheme theme, ColorRegistry registry, ColorDefinition definition,
 				IPreferenceStore store) {
 			ThemeElementHelper.populateDefinition(cssTheme, theme, registry, definition, store);
 		}

 		protected void populateDefinition(org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme,
 				ITheme theme, FontRegistry registry, FontDefinition definition,
 				IPreferenceStore store) {
 			ThemeElementHelper.populateDefinition(cssTheme, theme, registry, definition, store);
 		}
 	}

 }
	/*******************************************************************************
	* Copyright (c) 2004, 2016 IBM Corporation and others.
	* All rights reserved. This program and the accompanying materials
	* are made available under the terms of the Eclipse Public License v1.0
	* which accompanies this distribution, and is available at
	* http://www.eclipse.org/legal/epl-v10.html
	*
	* Contributors:
	* IBM Corporation - initial API and implementation
	*******************************************************************************/
	package org.eclipse.ui.internal.themes;

	import java.util.HashMap;
	import java.util.Iterator;
	import java.util.Map;
	import org.eclipse.core.commands.common.EventManager;
	import org.eclipse.core.runtime.Platform;
	import org.eclipse.e4.core.contexts.IEclipseContext;
	import org.eclipse.e4.core.services.events.IEventBroker;
	import org.eclipse.e4.ui.css.swt.theme.IThemeEngine;
	import org.eclipse.e4.ui.internal.css.swt.definition.IThemeElementDefinitionOverridable;
	import org.eclipse.e4.ui.model.application.MApplication;
	import org.eclipse.e4.ui.services.IStylingEngine;
	import org.eclipse.e4.ui.workbench.UIEvents;
	import org.eclipse.jface.preference.IPreferenceStore;
	import org.eclipse.jface.preference.PreferenceConverter;
	import org.eclipse.jface.resource.ColorRegistry;
	import org.eclipse.jface.resource.FontRegistry;
	import org.eclipse.jface.resource.JFaceResources;
	import org.eclipse.jface.util.IPropertyChangeListener;
	import org.eclipse.jface.util.PropertyChangeEvent;
	import org.eclipse.swt.SWT;
	import org.eclipse.swt.graphics.FontData;
	import org.eclipse.swt.graphics.RGB;
	import org.eclipse.swt.widgets.Display;
	import org.eclipse.ui.IWorkbenchPreferenceConstants;
	import org.eclipse.ui.PlatformUI;
	import org.eclipse.ui.internal.Workbench;
	import org.eclipse.ui.internal.WorkbenchPlugin;
	import org.eclipse.ui.internal.misc.StatusUtil;
	import org.eclipse.ui.internal.util.PrefUtil;
	import org.eclipse.ui.statushandlers.StatusManager;
	import org.eclipse.ui.themes.ITheme;
	import org.eclipse.ui.themes.IThemeManager;
	import org.osgi.service.event.EventHandler;

	/**
	* Theme manager for the Workbench.
	*
	* @since 3.0
	*/
	public class WorkbenchThemeManager extends EventManager implements
	IThemeManager {
	public static RGB EMPTY_COLOR_VALUE = new RGB(0, 1, 2);

	private static final String SYSTEM_DEFAULT_THEME = "org.eclipse.ui.ide.systemDefault";//$NON-NLS-1$

	private static WorkbenchThemeManager instance;

	private IEclipseContext context;

	private IEventBroker eventBroker;

	public static interface Events {
	public static final String TOPIC = "org/eclipse/ui/internal/themes/WorkbenchThemeManager"; //$NON-NLS-1$

	public static final String THEME_REGISTRY_RESTYLED = TOPIC + "/themeRegistryRestyled"; //$NON-NLS-1$

	public static final String THEME_REGISTRY_MODIFIED = TOPIC + "/themeRegistryModified"; //$NON-NLS-1$
	}

	/**
	* Returns the singelton instance of the WorkbenchThemeManager
	*
	* @return singleton instance
	*/
	public static synchronized WorkbenchThemeManager getInstance() {
	if (instance == null) {
	instance = new WorkbenchThemeManager();
	}
	return instance;
	}


	private ITheme currentTheme;

	private IPropertyChangeListener currentThemeListener = event -> {
	firePropertyChange(event);
	if (event.getSource() instanceof FontRegistry) {
	JFaceResources.getFontRegistry().put(event.getProperty(),
	(FontData[]) event.getNewValue());
	} else if (event.getSource() instanceof ColorRegistry) {
	JFaceResources.getColorRegistry().put(event.getProperty(),
	(RGB) event.getNewValue());
	}
	};

	private ColorRegistry defaultThemeColorRegistry;

	private FontRegistry defaultThemeFontRegistry;

	private IThemeRegistry themeRegistry;

	private Map themes = new HashMap(7);

	private EventHandler themeChangedHandler = new WorkbenchThemeChangedHandler();

	private EventHandler themeRegistryModifiedHandler = new ThemeRegistryModifiedHandler();

	private boolean initialized = false;

	private WorkbenchThemeManager() {
	}

	/*
	* Initialize the WorkbenchThemeManager.
	* Determine the default theme according to the following rules:
	* 1) If we're in HC mode then default to system default
	* 2) Otherwise, if preference already set (e.g. via plugin_customization.ini), then observe that value
	* 3) Otherwise, use our default
	* Call dispose when we close.
	*/
	private synchronized void init() {
	if (initialized) {
	return;
	}
	initialized = true;
	defaultThemeColorRegistry = new ColorRegistry(PlatformUI.getWorkbench()
	.getDisplay());

	defaultThemeFontRegistry = new FontRegistry(PlatformUI.getWorkbench()
	.getDisplay());

	// copy the font values from preferences.
	FontRegistry jfaceFonts = JFaceResources.getFontRegistry();
	for (Object fontRegistryKey : jfaceFonts.getKeySet()) {
	String key = (String) fontRegistryKey;
	defaultThemeFontRegistry.put(key, jfaceFonts.getFontData(key));
	}

	//Theme might be set via plugin_configuration.ini
	String themeId = PrefUtil.getAPIPreferenceStore().getDefaultString(IWorkbenchPreferenceConstants.CURRENT_THEME_ID);

	//If not set, use default
	if (themeId.length() == 0)
	themeId = IThemeManager.DEFAULT_THEME;

	final boolean highContrast = Display.getCurrent().getHighContrast();

	Display.getCurrent().addListener(SWT.Settings, event -> updateThemes());

	// If in HC, always use the system default.
	// This ignores any default theme set via plugin_customization.ini
	if (highContrast)
	themeId = SYSTEM_DEFAULT_THEME;

	PrefUtil.getAPIPreferenceStore().setDefault(
	IWorkbenchPreferenceConstants.CURRENT_THEME_ID, themeId);

	context = Workbench.getInstance().getService(IEclipseContext.class);
	eventBroker = Workbench.getInstance().getService(IEventBroker.class);
	if (eventBroker != null) {
	eventBroker.subscribe(UIEvents.UILifeCycle.THEME_CHANGED, themeChangedHandler);
	eventBroker.subscribe(IThemeEngine.Events.THEME_CHANGED, themeChangedHandler);
	eventBroker.subscribe(Events.THEME_REGISTRY_MODIFIED, themeRegistryModifiedHandler);
	}
	getCurrentTheme(); // initialize the current theme
	}

	/*
	* Update existing theme contents, descriptors, and registries.
	* Reread the themes and recompute the registries.
	*/
	private void updateThemes() {
	//reread the themes since their descriptors have changed in value
	ThemeRegistryReader reader = new ThemeRegistryReader();
	reader.readThemes(Platform.getExtensionRegistry(),(ThemeRegistry) getThemeRegistry());

	//DEFAULT_THEME is not in getThemes() list so must be handled special
	ThemeElementHelper.populateRegistry(getTheme(IThemeManager.DEFAULT_THEME), getThemeRegistry().getColors(), PrefUtil.getInternalPreferenceStore());

	IThemeDescriptor[] themeDescriptors = getThemeRegistry().getThemes();

	for (IThemeDescriptor themeDescriptor : themeDescriptors) {
	ITheme theme = (ITheme) themes.get(themeDescriptor);
	//If theme is in our themes table then its already been populated
	if (theme != null) {
	ColorDefinition[] colorDefinitions = themeDescriptor.getColors();

	if (colorDefinitions.length > 0) {
	ThemeElementHelper.populateRegistry(theme, colorDefinitions,PrefUtil.getInternalPreferenceStore());
	}
	}
	}
	}
	@Override
	public void addPropertyChangeListener(IPropertyChangeListener listener) {
	addListenerObject(listener);
	}

	/**
	* Disposes all ThemeEntries.
	*/
	public void dispose() {
	if (eventBroker != null) {
	eventBroker.unsubscribe(themeChangedHandler);
	eventBroker.unsubscribe(themeRegistryModifiedHandler);
	}

	for (Iterator i = themes.values().iterator(); i.hasNext();) {
	ITheme theme = (ITheme) i.next();
	theme.removePropertyChangeListener(currentThemeListener);
	theme.dispose();
	}
	themes.clear();
	}

	private boolean doSetCurrentTheme(String id) {
	ITheme oldTheme = currentTheme;
	ITheme newTheme = getTheme(id);
	if (oldTheme != newTheme && newTheme != null) {
	currentTheme = newTheme;
	return true;
	}

	return false;
	}

	protected void firePropertyChange(PropertyChangeEvent event) {
	for (Object listener : getListeners()) {
	((IPropertyChangeListener) listener).propertyChange(event);
	}
	}

	protected void firePropertyChange(String changeId, ITheme oldTheme,
	ITheme newTheme) {

	PropertyChangeEvent event = new PropertyChangeEvent(this, changeId,
	oldTheme, newTheme);
	firePropertyChange(event);
	}

	@Override
	public ITheme getCurrentTheme() {
	init();
	if (currentTheme == null) {
	String themeId = PrefUtil.getAPIPreferenceStore().getString(
	IWorkbenchPreferenceConstants.CURRENT_THEME_ID);

	if (themeId == null) // missing preference
	setCurrentTheme(IThemeManager.DEFAULT_THEME);
	else {
	setCurrentTheme(themeId);
	if (currentTheme == null) { // still null - the preference
	// didn't resolve to a proper theme
	setCurrentTheme(IThemeManager.DEFAULT_THEME);
	StatusManager
	.getManager()
	.handle(
	StatusUtil
	.newStatus(
	PlatformUI.PLUGIN_ID,
	"Could not restore current theme: " + themeId, null)); //$NON-NLS-1$
	}
	}
	}
	return currentTheme;
	}

	/**
	* Return the default color registry.
	*
	* @return the default color registry
	*/
	public ColorRegistry getDefaultThemeColorRegistry() {
	init();
	return defaultThemeColorRegistry;
	}

	/**
	* Return the default font registry.
	*
	* @return the default font registry
	*/
	public FontRegistry getDefaultThemeFontRegistry() {
	init();
	return defaultThemeFontRegistry;
	}

	private ITheme getTheme(IThemeDescriptor td) {
	ITheme theme = (ITheme) themes.get(td);
	if (theme == null) {
	theme = new Theme(td);
	themes.put(td, theme);
	}
	return theme;
	}

	@Override
	public ITheme getTheme(String id) {
	init();
	if (id.equals(IThemeManager.DEFAULT_THEME)) {
	return getTheme((IThemeDescriptor) null);
	}

	IThemeDescriptor td = getThemeRegistry().findTheme(id);
	if (td == null) {
	return null;
	}
	return getTheme(td);
	}

	/**
	* Answer the IThemeRegistry for the Workbench
	*/
	private IThemeRegistry getThemeRegistry() {
	if (themeRegistry == null) {
	themeRegistry = WorkbenchPlugin.getDefault().getThemeRegistry();
	}
	return themeRegistry;
	}

	@Override
	public void removePropertyChangeListener(IPropertyChangeListener listener) {
	removeListenerObject(listener);
	}

	@Override
	public void setCurrentTheme(String id) {
	init();
	ITheme oldTheme = currentTheme;
	if (WorkbenchThemeManager.getInstance().doSetCurrentTheme(id)) {
	firePropertyChange(CHANGE_CURRENT_THEME, oldTheme,
	getCurrentTheme());
	if (oldTheme != null) {
	oldTheme.removePropertyChangeListener(currentThemeListener);
	}
	currentTheme.addPropertyChangeListener(currentThemeListener);

	// update the preference if required.
	if (!PrefUtil.getAPIPreferenceStore().getString(
	IWorkbenchPreferenceConstants.CURRENT_THEME_ID).equals(id)) {
	PrefUtil.getAPIPreferenceStore().setValue(
	IWorkbenchPreferenceConstants.CURRENT_THEME_ID, id);
	PrefUtil.saveAPIPrefs();
	}

	// update the jface registries
	{
	ColorRegistry jfaceColors = JFaceResources.getColorRegistry();
	ColorRegistry themeColors = currentTheme.getColorRegistry();
	for (Object themeColorKey : themeColors.getKeySet()) {
	String key = (String) themeColorKey;
	jfaceColors.put(key, themeColors.getRGB(key));
	}
	}
	{
	FontRegistry jfaceFonts = JFaceResources.getFontRegistry();
	FontRegistry themeFonts = currentTheme.getFontRegistry();
	for (Object themeFontKey : themeFonts.getKeySet()) {
	String key = (String) themeFontKey;
	jfaceFonts.put(key, themeFonts.getFontData(key));
	}
	}
	{
	if (oldTheme != null && eventBroker != null) {
	eventBroker.send(UIEvents.UILifeCycle.THEME_CHANGED, null);
	eventBroker.send(UIEvents.UILifeCycle.THEME_DEFINITION_CHANGED,
	context.get(MApplication.class.getName()));
	}
	}
	}
	}

	public static class WorkbenchThemeChangedHandler implements EventHandler {
	@Override
	public void handleEvent(org.osgi.service.event.Event event) {
	IStylingEngine engine = getStylingEngine();
	ThemeRegistry themeRegistry = getThemeRegistry();
	FontRegistry fontRegistry = getFontRegistry();
	ColorRegistry colorRegistry = getColorRegistry();

	resetThemeRegistries(themeRegistry, fontRegistry, colorRegistry);
	overrideAlreadyExistingDefinitions(event, engine, themeRegistry, fontRegistry,
	colorRegistry);
	addNewDefinitions(event, engine, themeRegistry, fontRegistry, colorRegistry);

	sendThemeRegistryRestyledEvent();
	}

	protected IStylingEngine getStylingEngine() {
	return (IStylingEngine) getContext().get(IStylingEngine.SERVICE_NAME);
	}

	protected ThemeRegistry getThemeRegistry() {
	return (ThemeRegistry) getContext().get(IThemeRegistry.class.getName());
	}

	protected FontRegistry getFontRegistry() {
	return getColorsAndFontsTheme().getFontRegistry();
	}

	protected ColorRegistry getColorRegistry() {
	return getColorsAndFontsTheme().getColorRegistry();
	}

	protected void sendThemeRegistryRestyledEvent() {
	IEventBroker eventBroker = (IEventBroker) getContext()
	.get(IEventBroker.class.getName());
	eventBroker.send(Events.THEME_REGISTRY_RESTYLED, null);
	}

	protected ITheme getColorsAndFontsTheme() {
	return WorkbenchThemeManager.getInstance().getCurrentTheme();
	}

	private IEclipseContext getContext() {
	return WorkbenchThemeManager.getInstance().context;
	}

	protected org.eclipse.e4.ui.css.swt.theme.ITheme getTheme(org.osgi.service.event.Event event) {
	org.eclipse.e4.ui.css.swt.theme.ITheme theme = (org.eclipse.e4.ui.css.swt.theme.ITheme) event
	.getProperty(IThemeEngine.Events.THEME);
	if (theme == null) {
	IThemeEngine themeEngine = (IThemeEngine) getContext().get(
	IThemeEngine.class.getName());
	theme = themeEngine != null ? themeEngine.getActiveTheme() : null;
	}
	return theme;
	}

	// At this moment we don't remove the definitions added by CSS since we
	// don't want to modify the 3.x theme registries api
	protected void resetThemeRegistries(ThemeRegistry themeRegistry, FontRegistry fontRegistry,
	ColorRegistry colorRegistry) {
	for (FontDefinition def : themeRegistry.getFonts()) {
	if (def.isOverridden()) {
	def.resetToDefaultValue();
	fontRegistry.put(def.getId(), def.getValue() != null ? def.getValue()
	: PreferenceConverter.getFontDataArrayDefaultDefault());
	}
	}
	for (ColorDefinition def : themeRegistry.getColors()) {
	if (def.isOverridden()) {
	def.resetToDefaultValue();
	colorRegistry.put(def.getId(), def.getValue() != null ? def.getValue()
	: EMPTY_COLOR_VALUE);
	}
	}
	}

	protected void overrideAlreadyExistingDefinitions(org.osgi.service.event.Event event,
	IStylingEngine engine, ThemeRegistry themeRegistry, FontRegistry fontRegistry,
	ColorRegistry colorRegistry) {
	IPreferenceStore store = PrefUtil.getInternalPreferenceStore();
	org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme = getTheme(event);
	ITheme theme = getColorsAndFontsTheme();

	for (FontDefinition fontDefinition : themeRegistry.getFonts()) {
	engine.style(fontDefinition);
	if (fontDefinition.isOverridden()) {
	populateDefinition(cssTheme, theme, fontRegistry, fontDefinition, store);
	if (!fontDefinition.isModifiedByUser()) {
	fontRegistry.put(fontDefinition.getId(), fontDefinition.getValue());
	}
	}
	}
	for (ColorDefinition colorDefinition : themeRegistry.getColors()) {
	engine.style(colorDefinition);
	if (colorDefinition.isOverridden()) {
	populateDefinition(cssTheme, theme, colorRegistry, colorDefinition, store);
	if (!colorDefinition.isModifiedByUser()) {
	colorRegistry.put(colorDefinition.getId(), colorDefinition.getValue());
	}
	}
	}
	}

	private void addNewDefinitions(org.osgi.service.event.Event event, IStylingEngine engine,
	ThemeRegistry themeRegistry, FontRegistry fontRegistry, ColorRegistry colorRegistry) {
	IPreferenceStore store = PrefUtil.getInternalPreferenceStore();
	org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme = getTheme(event);
	ITheme theme = getColorsAndFontsTheme();
	ThemesExtension themesExtension = createThemesExtension();
	engine.style(themesExtension);

	for (IThemeElementDefinitionOverridable<?> definition : themesExtension
	.getDefinitions()) {
	engine.style(definition);
	if (definition.isOverridden() && definition instanceof FontDefinition) {
	addFontDefinition((FontDefinition) definition, themeRegistry, fontRegistry);
	populateDefinition(cssTheme, theme, fontRegistry, (FontDefinition) definition,
	store);
	} else if (definition.isOverridden() && definition instanceof ColorDefinition) {
	addColorDefinition((ColorDefinition) definition, themeRegistry, colorRegistry);
	populateDefinition(cssTheme, theme, colorRegistry,
	(ColorDefinition) definition, store);
	}
	}
	}

	private void addFontDefinition(FontDefinition definition, ThemeRegistry themeRegistry,
	FontRegistry fontRegistry) {
	if (themeRegistry.findFont(definition.getId()) == null) {
	themeRegistry.add(definition);
	fontRegistry.put(definition.getId(), definition.getValue());
	}
	}

	private void addColorDefinition(ColorDefinition definition, ThemeRegistry themeRegistry,
	ColorRegistry colorRegistry) {
	if (themeRegistry.findColor(definition.getId()) == null) {
	themeRegistry.add(definition);
	colorRegistry.put(definition.getId(), definition.getValue());
	}
	}

	protected ThemesExtension createThemesExtension() {
	return new ThemesExtension();
	}

	protected void populateDefinition(org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme,
	ITheme theme, ColorRegistry registry, ColorDefinition definition,
	IPreferenceStore store) {
	ThemeElementHelper.populateDefinition(cssTheme, theme, registry, definition, store);
	}

	protected void populateDefinition(org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme,
	ITheme theme, FontRegistry registry, FontDefinition definition,
	IPreferenceStore store) {
	ThemeElementHelper.populateDefinition(cssTheme, theme, registry, definition, store);
	}
	}

	public static class ThemeRegistryModifiedHandler implements EventHandler {
	@Override
	public void handleEvent(org.osgi.service.event.Event event) {
	populateThemeRegistries(getThemeRegistry(), getFontRegistry(), getColorRegistry(),
	getTheme(), getColorsAndFontsTheme());
	sendThemeDefinitionChangedEvent();
	}

	protected org.eclipse.e4.ui.css.swt.theme.ITheme getTheme() {
	IThemeEngine themeEngine = (IThemeEngine) getContext()
	.get(IThemeEngine.class.getName());
	return themeEngine != null ? themeEngine.getActiveTheme() : null;
	}

	protected ThemeRegistry getThemeRegistry() {
	return (ThemeRegistry) getContext().get(IThemeRegistry.class.getName());
	}

	protected FontRegistry getFontRegistry() {
	return getColorsAndFontsTheme().getFontRegistry();
	}

	protected ColorRegistry getColorRegistry() {
	return getColorsAndFontsTheme().getColorRegistry();
	}

	protected ITheme getColorsAndFontsTheme() {
	return WorkbenchThemeManager.getInstance().getCurrentTheme();
	}

	private IEclipseContext getContext() {
	return WorkbenchThemeManager.getInstance().context;
	}

	protected void sendThemeDefinitionChangedEvent() {
	MApplication application = (MApplication) getContext()
	.get(MApplication.class.getName());
	getInstance().eventBroker.send(UIEvents.UILifeCycle.THEME_DEFINITION_CHANGED,
	application);
	}

	protected void populateThemeRegistries(ThemeRegistry themeRegistry,
	FontRegistry fontRegistry, ColorRegistry colorRegistry,
	org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme, ITheme theme) {
	IPreferenceStore store = PrefUtil.getInternalPreferenceStore();
	for (FontDefinition definition : themeRegistry.getFonts()) {
	if (definition.isOverridden() \|\| definition.isAddedByCss()) {
	populateDefinition(cssTheme, theme, fontRegistry, definition, store);
	}
	}
	for (ColorDefinition definition : themeRegistry.getColors()) {
	if (definition.isOverridden() \|\| definition.isAddedByCss()) {
	populateDefinition(cssTheme, theme, colorRegistry, definition, store);
	}
	}
	}

	protected void populateDefinition(org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme,
	ITheme theme, ColorRegistry registry, ColorDefinition definition,
	IPreferenceStore store) {
	ThemeElementHelper.populateDefinition(cssTheme, theme, registry, definition, store);
	}

	protected void populateDefinition(org.eclipse.e4.ui.css.swt.theme.ITheme cssTheme,
	ITheme theme, FontRegistry registry, FontDefinition definition,
	IPreferenceStore store) {
	ThemeElementHelper.populateDefinition(cssTheme, theme, registry, definition, store);
	}
	}

	}