/* 
 * Copyright (c) 2008 Stiftung Deutsches Elektronen-Synchrotron, 
 * Member of the Helmholtz Association, (DESY), HAMBURG, GERMANY.
 *
 * THIS SOFTWARE IS PROVIDED UNDER THIS LICENSE ON AN "../AS IS" BASIS. 
 * WITHOUT WARRANTY OF ANY KIND, EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED 
 * TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR PARTICULAR PURPOSE AND 
 * NON-INFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE 
 * FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, 
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR 
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. SHOULD THE SOFTWARE PROVE DEFECTIVE 
 * IN ANY RESPECT, THE USER ASSUMES THE COST OF ANY NECESSARY SERVICING, REPAIR OR 
 * CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL PART OF THIS LICENSE. 
 * NO USE OF ANY SOFTWARE IS AUTHORIZED HEREUNDER EXCEPT UNDER THIS DISCLAIMER.
 * DESY HAS NO OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, 
 * OR MODIFICATIONS.
 * THE FULL LICENSE SPECIFYING FOR THE SOFTWARE THE REDISTRIBUTION, MODIFICATION, 
 * USAGE AND OTHER RIGHTS AND OBLIGATIONS IS INCLUDED WITH THE DISTRIBUTION OF THIS 
 * PROJECT IN THE FILE LICENSE.HTML. IF THE LICENSE IS NOT INCLUDED YOU MAY FIND A COPY 
 * AT HTTP://WWW.DESY.DE/LEGAL/LICENSE.HTM
 */
package org.csstudio.sds.ui.internal.commands;

import org.csstudio.sds.model.AbstractWidgetModel;
import org.csstudio.sds.model.ContainerModel;
import org.csstudio.sds.model.commands.SetPropertyCommand;
import org.csstudio.sds.ui.feedback.IGraphicalFeedbackFactory;
import org.csstudio.sds.ui.internal.feedback.GraphicalFeedbackContributionsService;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.EditPartViewer;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.commands.CompoundCommand;
import org.eclipse.gef.requests.CreateRequest;

/**
 * A command, which creates a widget model and adds it to the display model.
 * 
 * @author Sven Wende
 * @version $Revision: 1.13 $
 * 
 */
public final class CreateElementCommand extends Command {

	/**
	 * The model.
	 */
	private ContainerModel _container;

	/**
	 * The create request.
	 */
	private CreateRequest _request;

	/**
	 * Bounds, which define size and location of the new widget.
	 */
	private Rectangle _bounds;

	/**
	 * The internal {@link CompoundCommand}.
	 */
	private Command _compoundCommand;

	private EditPartViewer _viewer;

	/**
	 * Constructs the command.
	 * 
	 * @param viewer
	 * 
	 * @param container
	 *            the display model to which the widgets should get added
	 * @param request
	 *            the create request
	 * @param bounds
	 *            bounds, which define size and location of the new widget
	 */
	public CreateElementCommand(EditPartViewer viewer, final ContainerModel container, final CreateRequest request, final Rectangle bounds) {
		assert viewer != null;
		assert container != null;
		assert request != null;
		assert bounds != null;
		this.setLabel("Create widget");
		_viewer = viewer;
		_container = container;
		_request = request;
		_bounds = bounds;
	}

	private Command createCompoundCommands() {
		CompoundCommand comCmd = new CompoundCommand();

		Object model = _request.getNewObject();

		if (model != null && model instanceof AbstractWidgetModel) {
			AbstractWidgetModel widgetModel = (AbstractWidgetModel) model;
			IGraphicalFeedbackFactory feedbackFactory = GraphicalFeedbackContributionsService.getInstance().getGraphicalFeedbackFactory(widgetModel.getTypeID());
			if (feedbackFactory != null) {
				Command boundsCmd = feedbackFactory.createInitialBoundsCommand(widgetModel, _request, _bounds);
				comCmd.add(boundsCmd);
			}

			comCmd.add(new SetPropertyCommand(widgetModel, AbstractWidgetModel.PROP_LAYER, _container.getLayerSupport().getActiveLayer().getId()));
			comCmd.add(new AddWidgetCommand(_container, widgetModel));
			comCmd.add(new SetSelectionCommand(_viewer, widgetModel));
		}
		return comCmd;
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void execute() {
		_compoundCommand = this.createCompoundCommands();
		_compoundCommand.execute();
	}

	/**
	 * {@inheritDoc}
	 */
	@Override
	public void undo() {
		_compoundCommand.undo();
	}
}