examples/org.eclipse.gmf.examples.layers.subdiagrams/src/org/eclipse/gmf/examples/layers/subdiagrams/popup/CreateNewLayerAction.java

package org.eclipse.gmf.examples.layers.subdiagrams.popup;

import java.util.List;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.UnexecutableCommand;
import org.eclipse.gmf.examples.layers.Layer;
import org.eclipse.gmf.examples.layers.LayersFactory;
import org.eclipse.gmf.examples.layers.LayersPackage;
import org.eclipse.gmf.examples.layers.SubDiagramSpec;
import org.eclipse.gmf.examples.layers.SubDiagramSupport;
import org.eclipse.gmf.runtime.common.core.command.CommandResult;
import org.eclipse.gmf.runtime.diagram.ui.actions.DiagramAction;
import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.editparts.DiagramEditPart;
import org.eclipse.gmf.runtime.emf.type.core.commands.EditElementCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.IEditCommandRequest;
import org.eclipse.jface.dialogs.InputDialog;
import org.eclipse.jface.window.Window;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IWorkbenchPage;

public class CreateNewLayerAction extends DiagramAction {

	private final List<EObject> mySemanticElements;

	private final SubDiagramSupport mySupport;

	private final SubDiagramSpec myDiagram;

	public CreateNewLayerAction(IWorkbenchPage workbenchPage, List<EObject> semanticElements, SubDiagramSupport support, SubDiagramSpec diagram) {
		super(workbenchPage);
		mySemanticElements = semanticElements;
		mySupport = support;
		myDiagram = diagram;
		setText("Add To New Layer...");
		setChecked(false);
	}

	@Override
	protected Request createTargetRequest() {
		return null;
	}

	@Override
	protected boolean isSelectionListener() {
		return true;
	}

	@Override
	protected Command getCommand() {
		DiagramEditPart diagramEditPart = getDiagramEditPart();
		if (diagramEditPart == null) {
			return UnexecutableCommand.INSTANCE;
		}
		IEditCommandRequest request = new DomainOnlyEditRequest(diagramEditPart);
		return new ICommandProxy(new CreateNewLayer("Creating New Layer", mySupport, mySemanticElements, myDiagram, request, getWorkbenchPart().getSite().getShell()));
	}

	@Override
	public boolean isEnabled() {
		return getDiagramEditPart() != null && !mySemanticElements.isEmpty();
	}

	public static class CreateNewLayer extends EditElementCommand {

		private final SubDiagramSupport mySupport;

		private final List<EObject> myAssignees;

		private final Shell myShell;

		private final SubDiagramSpec myDiagram;

		protected CreateNewLayer(String label, SubDiagramSupport support, List<EObject> assignees, SubDiagramSpec diagram, IEditCommandRequest request, Shell shell) {
			super(label, support, request);
			myAssignees = assignees;
			mySupport = support;
			myDiagram = diagram;
			myShell = shell;
		}

		@Override
		protected CommandResult doExecuteWithResult(IProgressMonitor monitor, IAdaptable info) throws ExecutionException {
			UniqueNameValidator validator = new UniqueNameValidator(mySupport.getLayers(), LayersPackage.eINSTANCE.getLayer_Name());
			InputDialog dialog = new InputDialog(myShell, //
					"Enter The Name", "New Layer's Name:", validator.guessNewName("Layer "), validator);

			if (dialog.open() != Window.OK) {
				return CommandResult.newCancelledCommandResult();
			}

			Layer layer = LayersFactory.eINSTANCE.createLayer();
			layer.setName(dialog.getValue());
			mySupport.getLayers().add(layer);
			mySupport.ensureAllSubDiagramsHaveEnablementForAllLayers();
			layer.getParticipants().addAll(myAssignees);
			
			myDiagram.findLayerEnablement(layer).setVisible(true);

			return CommandResult.newOKCommandResult(layer);
		}
	}
}