plugins/org.eclipse.osee.framework.ui.skynet/src/org/eclipse/osee/framework/ui/skynet/explorer/menu/NeedProjectMenuListener.java

/*******************************************************************************
 * Copyright (c) 2015 Boeing.
 * 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:
 *     Boeing - initial API and implementation
 *******************************************************************************/
package org.eclipse.osee.framework.ui.skynet.explorer.menu;

import java.util.Collection;
import java.util.LinkedList;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.osee.framework.ui.skynet.explorer.ArtifactExplorer;
import org.eclipse.swt.events.MenuEvent;
import org.eclipse.swt.events.MenuListener;
import org.eclipse.swt.widgets.MenuItem;

/**
 * @author Donald G. Dunne
 */
public class NeedProjectMenuListener implements MenuListener {
   Collection<MenuItem> items;
   private final TreeViewer treeViewer;

   public NeedProjectMenuListener(ArtifactExplorer artifactExplorer) {
      items = new LinkedList<>();
      treeViewer = artifactExplorer.getTreeViewer();
   }

   public void add(MenuItem item) {
      items.add(item);
   }

   @Override
   public void menuHidden(MenuEvent e) {
      // do nothing
   }

   @Override
   public void menuShown(MenuEvent e) {
      boolean valid = treeViewer.getInput() != null;
      for (MenuItem item : items) {
         if (!(item.getData() instanceof Exception)) {
            // Only modify
            // enabling if no
            // error is
            // associated
            item.setEnabled(valid);
         }
      }
   }
}