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/*******************************************************************************
* Copyright (c) 2010 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.e4.ui.internal.workbench.addons;
import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;
import javax.inject.Inject;
import org.eclipse.core.commands.contexts.Context;
import org.eclipse.core.commands.contexts.ContextManager;
import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.ui.internal.workbench.Activator;
import org.eclipse.e4.ui.internal.workbench.Policy;
import org.eclipse.e4.ui.model.application.MApplication;
import org.eclipse.e4.ui.model.application.commands.MBindingContext;
import org.eclipse.e4.ui.workbench.UIEvents;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventHandler;
/**
* Process contexts in the model, feeding them into the command service.
*/
public class ContextProcessingAddon {
@Inject
private MApplication application;
@Inject
private IEventBroker broker;
@Inject
private ContextManager contextManager;
private EventHandler additionHandler;
@PostConstruct
public void init() {
defineContexts();
registerModelListeners();
}
private void defineContexts() {
Activator.trace(Policy.DEBUG_CMDS, "Initialize contexts and parents from model", null); //$NON-NLS-1$
for (MBindingContext root : application.getRootContext()) {
defineContexts(null, root);
}
}
private void defineContexts(MBindingContext parent, MBindingContext current) {
Context context = contextManager.getContext(current.getElementId());
if (!context.isDefined()) {
context.define(current.getName(), current.getDescription(), parent == null ? null
: parent.getElementId());
}
for (MBindingContext child : current.getChildren()) {
defineContexts(current, child);
}
}
private void undefineContext(MBindingContext current) {
Context context = contextManager.getContext(current.getElementId());
context.undefine();
}
@PreDestroy
public void dispose() {
unregsiterModelListeners();
}
private void registerModelListeners() {
additionHandler = new EventHandler() {
public void handleEvent(Event event) {
Object elementObj = event.getProperty(UIEvents.EventTags.ELEMENT);
if (elementObj instanceof MBindingContext) {
Object newObj = event.getProperty(UIEvents.EventTags.NEW_VALUE);
Object oldObj = event.getProperty(UIEvents.EventTags.OLD_VALUE);
if (UIEvents.EventTypes.ADD.equals(event.getProperty(UIEvents.EventTags.TYPE))
&& newObj instanceof MBindingContext) {
MBindingContext newCtx = (MBindingContext) newObj;
defineContexts((MBindingContext) elementObj, newCtx);
} else if (UIEvents.EventTypes.REMOVE.equals(event
.getProperty(UIEvents.EventTags.TYPE))
&& oldObj instanceof MBindingContext) {
MBindingContext oldCtx = (MBindingContext) oldObj;
undefineContext(oldCtx);
}
}
}
};
broker.subscribe(UIEvents.BindingContext.TOPIC_CHILDREN, additionHandler);
}
private void unregsiterModelListeners() {
broker.unsubscribe(additionHandler);
}
}
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