ExternalLabelPrimaryDragRoleEditPolicy.java example

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modellipse-master
/*****************************************************************************
 * Copyright (c) 2010 CEA LIST.
 *
 *    
 * 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:
 *  Yann Tanguy (CEA LIST) yann.tanguy@cea.fr - Initial API and implementation
 *  Saadia DHOUIB (CEA LIST) saadia.dhouib@cea.fr - adapted from class diagram
 *****************************************************************************/
package org.eclipse.papyrus.uml.diagram.communication.custom.edit.policies;

import java.util.Collections;
import java.util.List;

import org.eclipse.draw2d.geometry.PrecisionRectangle;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.gef.GraphicalEditPart;
import org.eclipse.gef.commands.Command;
import org.eclipse.gef.handles.MoveHandle;
import org.eclipse.gef.requests.ChangeBoundsRequest;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.diagram.ui.commands.ICommandProxy;
import org.eclipse.gmf.runtime.diagram.ui.commands.SetBoundsCommand;
import org.eclipse.gmf.runtime.diagram.ui.editparts.LabelEditPart;
import org.eclipse.gmf.runtime.diagram.ui.editpolicies.NonResizableLabelEditPolicy;
import org.eclipse.gmf.runtime.diagram.ui.l10n.DiagramUIMessages;
import org.eclipse.gmf.runtime.emf.core.util.EObjectAdapter;
import org.eclipse.gmf.runtime.notation.View;

/**
 * This policy provides the selection handles, feedback and move command for
 * external node label. The expected behavior is to provide an external label
 * that can freely move and with a link feedback towards its parent figure
 * during the move.
 */
public class ExternalLabelPrimaryDragRoleEditPolicy extends NonResizableLabelEditPolicy {

	@SuppressWarnings("rawtypes")
	@Override
	protected List createSelectionHandles() {
		MoveHandle mh = new MoveHandle((GraphicalEditPart)getHost());
		mh.setBorder(null);
		return Collections.singletonList(mh);
	}

	@Override
	protected Command getMoveCommand(ChangeBoundsRequest request) {
		LabelEditPart editPart = (LabelEditPart)getHost();

		// FeedBack - Port + Delta
		Rectangle updatedRect = new Rectangle();
		PrecisionRectangle initialRect = new PrecisionRectangle(getInitialFeedbackBounds().getCopy());
		updatedRect = initialRect.getTranslated(getHostFigure().getParent().getBounds().getLocation().getNegated());
		updatedRect = updatedRect.getTranslated(request.getMoveDelta());

		// translate the feedback figure
		PrecisionRectangle rect = new PrecisionRectangle(getInitialFeedbackBounds().getCopy());
		getHostFigure().translateToAbsolute(rect);
		rect.translate(request.getMoveDelta());
		rect.resize(request.getSizeDelta());
		getHostFigure().translateToRelative(rect);

		ICommand moveCommand = new SetBoundsCommand(editPart.getEditingDomain(), DiagramUIMessages.MoveLabelCommand_Label_Location, new EObjectAdapter((View)editPart.getModel()), updatedRect);
		return new ICommandProxy(moveCommand);
	}
}