/*

 * Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies). 

 * All rights reserved.

 * This component and the accompanying materials are made available

 * under the terms of "Eclipse Public License v1.0"

 * which accompanies this distribution, and is available

 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

 *

 * Initial Contributors:

 * Nokia Corporation - initial contribution.

 *

 * Contributors:

 *

 * Description:

 *

 * Scroller Selection Listener class

 *

 */

package com.nokia.traceviewer.view.listener;

import org.eclipse.jface.text.TextViewer;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.widgets.Slider;

import com.nokia.traceviewer.engine.StateHolder;

import com.nokia.traceviewer.engine.TraceViewerGlobals;

/**

 * Scroller Selection Listener listens changes in view's scroller

 */

public class ScrollerSelectionListener implements SelectionListener {

	/**

	 * Text viewer

	 */

	private final TextViewer viewer;

	/**

	 * Constructor

	 * 

	 * @param viewer

	 *            the viewer

	 */

	public ScrollerSelectionListener(TextViewer viewer) {

		this.viewer = viewer;

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see

	 * org.eclipse.swt.events.SelectionListener#widgetDefaultSelected(org.eclipse

	 * .swt.events.SelectionEvent)

	 */

	public void widgetDefaultSelected(SelectionEvent e) {

	}

	/*

	 * (non-Javadoc)

	 * 

	 * @see

	 * org.eclipse.swt.events.SelectionListener#widgetSelected(org.eclipse.swt

	 * .events.SelectionEvent)

	 */

	public void widgetSelected(SelectionEvent e) {

		Slider slider = (Slider) e.getSource();

		TraceViewerGlobals.getTraceViewer().getStateHolder().setState(

				StateHolder.State.SCROLLING_WITH_SCROLLBAR);

		// Scroll to new line

		TraceViewerGlobals.getTraceViewer().getView().scrollViewToLine(

				slider.getSelection());

		viewer.setTopIndex(slider.getSelection()

				- TraceViewerGlobals.getTraceViewer().getView()

						.getShowingTracesFrom());

	}

}