tmf: Simple warning fixes in tmf.ui and tests

[deliverable/tracecompass.git] / org.eclipse.linuxtools.tmf.ui / src / org / eclipse / linuxtools / tmf / ui / views / uml2sd / handlers / MoveSDUp.java

/**********************************************************************
 * Copyright (c) 2005, 2006 IBM Corporation and others.
 * Copyright (c) 2011, 2012 Ericsson.
 *
 * 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:
 * IBM - Initial API and implementation
 * Bernd Hufmann - Updated for TMF
 **********************************************************************/
package org.eclipse.linuxtools.tmf.ui.views.uml2sd.handlers;

import org.eclipse.jface.action.Action;
import org.eclipse.linuxtools.tmf.ui.views.uml2sd.SDView;
import org.eclipse.linuxtools.tmf.ui.views.uml2sd.SDWidget;

/**
 * Action class implementation to move up in the sequence diagram view within a
 * page.
 *
 * @version 1.0
 * @author sveyrier
 */
public class MoveSDUp extends Action {

    // ------------------------------------------------------------------------
    // Constants
    // ------------------------------------------------------------------------
    /**
     * The action ID.
     */
    public final static String ID = "org.eclipse.linuxtools.tmf.ui.views.uml2sd.handlers.MoveSDUp"; //$NON-NLS-1$

    // ------------------------------------------------------------------------
    // Attributes
    // ------------------------------------------------------------------------
    /**
     * The sequence diagram view reference.
     */
    protected SDView fView = null;

    // ------------------------------------------------------------------------
    // Constructors
    // ------------------------------------------------------------------------
    /**
     * Default constructor
     */
    public MoveSDUp() {
        this(null);
    }

    /**
     * Constructor
     *
     * @param view a sequence diagram view reference
     */
    public MoveSDUp(SDView view) {
        super();
        setId(ID);
        setActionDefinitionId(ID);
        fView = view;
    }

    // ------------------------------------------------------------------------
    // Methods
    // ------------------------------------------------------------------------
    /*
     * (non-Javadoc)
     * @see org.eclipse.jface.action.Action#run()
     */
    @Override
    public void run() {
        if (fView == null) {
            return;
        }
        SDWidget viewer = fView.getSDWidget();

        if (viewer != null) {
            viewer.scrollBy(0, -viewer.getVisibleHeight());
        }
    }

    /**
     * Sets the active SD view.
     * @param view The SD view.
     */
    public void setView(SDView view) {
        fView = view;
    }
}