/*******************************************************************************
* Copyright (c) 2012 BestSolution.at 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:
* Tom Schindl<tom.schindl@bestsolution.at> - initial API and implementation
*******************************************************************************/
package at.bestsolution.efxclipse.runtime.workbench.renderers.base;
import org.eclipse.e4.core.services.events.IEventBroker;
import org.eclipse.e4.ui.model.application.ui.MElementContainer;
import org.eclipse.e4.ui.model.application.ui.MUIElement;
import org.eclipse.e4.ui.workbench.UIEvents;
import org.eclipse.emf.ecore.EObject;
import org.osgi.service.event.Event;
import org.osgi.service.event.EventHandler;
@SuppressWarnings("restriction")
public class EventProcessor {
public interface ChildrenHandler<M extends MUIElement, C extends MUIElement> {
public void handleChildAddition(M parent, C element);
public void handleChildRemove(M parent, C element);
}
public static <C extends MUIElement, M extends MElementContainer<C>, R extends BaseRenderer<M, ?> & ChildrenHandler<M, C>> void attachChildProcessor(IEventBroker eventBroker, final R renderer) {
eventBroker.subscribe(UIEvents.ElementContainer.TOPIC_CHILDREN, new EventHandler() {
@SuppressWarnings("unchecked")
@Override
public void handleEvent(Event event) {
Object changedObj = event.getProperty(UIEvents.EventTags.ELEMENT);
MUIElement parent = (MUIElement) changedObj;
if (parent.getRenderer() == renderer) {
String eventType = (String) event.getProperty(UIEvents.EventTags.TYPE);
if (UIEvents.EventTypes.ADD.equals(eventType)) {
MUIElement element = (MUIElement) event.getProperty(UIEvents.EventTags.NEW_VALUE);
renderer.handleChildAddition((M) parent, (C) element);
} else if (UIEvents.EventTypes.REMOVE.equals(eventType)) {
MUIElement element = (MUIElement) event.getProperty(UIEvents.EventTags.OLD_VALUE);
renderer.handleChildRemove((M) parent, (C) element);
}
}
}
});
}
public static <M extends MUIElement, R extends BaseRenderer<M, ?>> void attachVisibleProcessor(IEventBroker eventBroker, final R renderer) {
eventBroker.subscribe(UIEvents.UIElement.TOPIC_VISIBLE, new EventHandler() {
@SuppressWarnings("unchecked")
@Override
public void handleEvent(Event event) {
MUIElement changedObj = (MUIElement) event.getProperty(UIEvents.EventTags.ELEMENT);
if (changedObj.isToBeRendered()) {
EObject parent = ((EObject)changedObj).eContainer();
if (parent instanceof MUIElement) {
if (((MUIElement)parent).getRenderer() == renderer) {
String eventType = (String) event.getProperty(UIEvents.EventTags.TYPE);
if (UIEvents.EventTypes.SET.equals(eventType)) {
Boolean newValue = (Boolean) event.getProperty(UIEvents.EventTags.NEW_VALUE);
if (newValue.booleanValue()) {
// TODO Is childRendered not dangerous to
// call
// here??
renderer.childRendered((M)parent, changedObj);
} else {
renderer.hideChild((M)parent, changedObj);
}
}
}
}
}
}
});
}
}