/*******************************************************************************
* Copyright (c) 2012-2017 Codenvy, S.A.
* 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:
* Codenvy, S.A. - initial API and implementation
*******************************************************************************/
package org.eclipse.che.ide.selection;
import org.eclipse.che.ide.api.event.ActivePartChangedEvent;
import org.eclipse.che.ide.api.event.ActivePartChangedHandler;
import org.eclipse.che.ide.api.event.SelectionChangedEvent;
import org.eclipse.che.ide.api.parts.PartPresenter;
import org.eclipse.che.ide.api.parts.PropertyListener;
import org.eclipse.che.ide.api.selection.Selection;
import org.eclipse.che.ide.api.selection.SelectionAgent;
import com.google.inject.Inject;
import com.google.web.bindery.event.shared.EventBus;
/**
* Implements {@link SelectionAgent}
*
* @author Nikolay Zamosenchuk
*/
public class SelectionAgentImpl implements ActivePartChangedHandler, PropertyListener, SelectionAgent {
private PartPresenter activePart;
private final EventBus eventBus;
@Inject
public SelectionAgentImpl(EventBus eventBus) {
this.eventBus = eventBus;
// bind event listener
eventBus.addHandler(ActivePartChangedEvent.TYPE, this);
}
/** {@inheritDoc} */
@Override
public Selection<?> getSelection() {
return activePart != null ? activePart.getSelection() : null;
}
protected void notifySelectionChanged() {
eventBus.fireEvent(new SelectionChangedEvent(getSelection()));
}
/** {@inheritDoc} */
@Override
public void onActivePartChanged(ActivePartChangedEvent event) {
// remove listener from previous active part
if (activePart != null) {
activePart.removePropertyListener(this);
}
// set new active part
activePart = event.getActivePart();
if (activePart != null) {
activePart.addPropertyListener(this);
}
notifySelectionChanged();
}
/** {@inheritDoc} */
@Override
public void propertyChanged(PartPresenter source, int propId) {
// Check property and ensure came from active part
if (propId == PartPresenter.SELECTION_PROPERTY && source == activePart) {
notifySelectionChanged();
}
}
}