ExpandFrameDragTracker.java

package org.eclipse.uml2.diagram.sequence.edit.policies;

import org.eclipse.draw2d.IFigure;
import org.eclipse.gef.EditPart;
import org.eclipse.gef.Request;
import org.eclipse.gef.commands.Command;
import org.eclipse.gmf.runtime.diagram.ui.editparts.GraphicalEditPart;

public class ExpandFrameDragTracker extends org.eclipse.gef.tools.DragEditPartsTracker {

	private final IFigure myHandle;

	private final int myExpandDirection;

	public ExpandFrameDragTracker(GraphicalEditPart owner, int expandDirection, IFigure handle) {
		super(owner);
		myHandle = handle;
		myExpandDirection = expandDirection;
	}

	public void activate() {
		super.activate();
		myHandle.setVisible(false);
	}

	public void deactivate() {
		myHandle.setVisible(true);
		super.deactivate();
	}

	protected Request createTargetRequest() {
		TieFrameRequest request = new TieFrameRequest(this);
		request.setResizeDirection(myExpandDirection);
		return request;
	}

	protected String getCommandName() {
		return TieFrameRequest.REQ_TYPE;
	}

	protected Command getCommand() {
		EditPart editPart = getTargetEditPart();
		if (editPart == getSourceEditPart()) {
			return null;
		}
		if (!(editPart instanceof GraphicalEditPart)) {
			return null;
		}
		TieFrameRequest.Completed completedRequest = new TieFrameRequest.Completed((TieFrameRequest) getTargetRequest(), (GraphicalEditPart) getSourceEditPart());
		Command command = editPart.getCommand(completedRequest);
		return command;
	}

	@Override
	protected void setTargetEditPart(EditPart editpart) {
		super.setTargetEditPart(editpart);
	}

}