EDIT

	@Override

    public String getText(Object element) {

// $Id$

/**

* Copyright (C) 2017 EDIT

* European Distributed Institute of Taxonomy

* http://www.e-taxonomy.eu

*

* The contents of this file are subject to the Mozilla Public License Version 1.1

* See LICENSE.TXT at the top of this package for the full license terms.

*/

package eu.etaxonomy.taxeditor.editor.view.media;

import java.io.InputStream;

import java.net.URI;

import java.util.List;

import java.util.Set;

import org.eclipse.jface.viewers.DelegatingStyledCellLabelProvider.IStyledLabelProvider;

import org.eclipse.jface.viewers.LabelProvider;

import org.eclipse.jface.viewers.StyledString;

import org.eclipse.swt.SWT;

import org.eclipse.swt.graphics.GC;

import org.eclipse.swt.graphics.Image;

import org.eclipse.swt.widgets.Display;

import eu.etaxonomy.cdm.common.UriUtils;

import eu.etaxonomy.cdm.model.common.IdentifiableEntity;

import eu.etaxonomy.cdm.model.media.Media;

import eu.etaxonomy.cdm.model.media.MediaRepresentation;

import eu.etaxonomy.cdm.model.media.MediaRepresentationPart;

import eu.etaxonomy.taxeditor.preference.PreferencesUtil;

/**

 * @author k.luther

 * @date 11.10.2017

 *

 */

public class MediaViewLabelProvider extends LabelProvider implements IStyledLabelProvider {

    @Override

    public StyledString getStyledText(Object element) {

        if (element instanceof IdentifiableEntity) {

            IdentifiableEntity identifiableEntity= (IdentifiableEntity) element;

            StyledString styledString = new StyledString(identifiableEntity.getTitleCache());

            return styledString;

        }

        return null;

    }

    @Override

    public Image getImage(Object element) {

        Image image = null;

        if (element instanceof Media && PreferencesUtil.isShowMediaPreview()){

            Set<MediaRepresentation> representations = ((Media)element).getRepresentations();

            if(representations.iterator().hasNext()){

                MediaRepresentation rep = representations.iterator().next();

                List<MediaRepresentationPart> parts = rep.getParts();

                URI uri = parts.get(0).getUri();

                if (uri == null){

                    return null;

                }

                InputStream imageStream;

                try {

                    imageStream = UriUtils.getInputStream(uri);

                    image = new Image(Display.getCurrent(), imageStream);

                    int height = image.getBounds().height;

                    int width = image.getBounds().width;

                    int scale = 50;

                    if (height>width){

                        width = width/(height/scale);

                        height = scale;

                    }else{

                        height = height/(width/scale);

                        width = scale;

                    }

                    Image scaled = new Image(Display.getDefault(), scale, scale);

                    GC gc = new GC(scaled);

                    gc.setAntialias(SWT.ON);

                    gc.setInterpolation(SWT.HIGH);

                    gc.drawImage(image, 0, 0,

                    image.getBounds().width, image.getBounds().height,

                    0, 0, width, height);

                    gc.dispose();

                    image.dispose(); // don't forget about me!

                    return scaled;

                } catch (Exception e) {

                    // TODO Auto-generated catch block

                   return null;

                }

            }

        }

        return image;

    }

    @Override

    public void dispose() {

        // garbage collection system resources

    }

}

import eu.etaxonomy.taxeditor.editor.view.media.MediaViewLabelProvider;

		treeViewer.setLabelProvider(new MediaViewLabelProvider());

//		TreeViewerColumn imagePreview = new TreeViewerColumn(treeViewer, SWT.NONE);

//		imagePreview.setLabelProvider(new DelegatingStyledCellLabelProvider(

//                new MediaViewLabelProvider(createImageDescriptor())));

    public static final String SHOW_ADVANCED_MEDIA_SECTION = "eu.etaxonomy.taxeditor.media.showAdvancedMedia";

    public static final String SHOW_MEDIA_PREVIEW = "eu.etaxonomy.taxeditor.media.showMediaPreview";

        addField(new BooleanFieldEditor(IPreferenceKeys.SHOW_MEDIA_PREVIEW,

                "Show Preview in Media View",

                getFieldEditorParent()));

	public static boolean isShowMediaPreview(){

        boolean isShowMediaPreview = getPreferenceStore().getBoolean(SHOW_MEDIA_PREVIEW);

        return isShowMediaPreview;

    }