Eclipse RCP allow you to create easily utility programs.

Lets for example create a mini-file browser which will open a folder / file if you double-click the selection via the standard program.

To create a RCP based file browser create a new Eclipse RCP project, e.g. de.vogella.rcp.intro.filebrowser.

Create a package “de.vogella.rcp.intro.filebrowser.provider” and create the following label and content provider.

package de.vogella.rcp.intro.filebrowser.provider;

import java.io.File;

import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;

public class FileContentProvider implements ITreeContentProvider {

@Override
public Object[] getChildren(Object parent) {
File file = (File) parent;
return file.listFiles();
}

public Object[] getElements(Object inputElement) {
return (Object[]) inputElement;
}

@Override
public Object getParent(Object element) {
File file = (File) element;
return file.getParentFile();
}

@Override
public boolean hasChildren(Object parent) {
File file = (File) parent;
return file.isDirectory();
}

@Override
public void dispose() {

}

@Override
public void inputChanged(Viewer arg0, Object arg1, Object arg2) {
}

}

package de.vogella.rcp.intro.filebrowser.provider;

import java.io.File;

import org.eclipse.jface.viewers.LabelProvider;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.plugin.AbstractUIPlugin;

public class FileLabelProvider extends LabelProvider {
private static final Image folderImage = AbstractUIPlugin
.imageDescriptorFromPlugin("de.vogella.rcp.intro.filebrowser",
"icons/folder.gif").createImage();
private static final Image driveImage = AbstractUIPlugin
.imageDescriptorFromPlugin("de.vogella.rcp.intro.filebrowser",
"icons/filenav_nav.gif").createImage();
private static final Image fileImage = AbstractUIPlugin
.imageDescriptorFromPlugin("de.vogella.rcp.intro.filebrowser",
"icons/file_obj.gif").createImage();

@Override
public Image getImage(Object element) {
File file = (File) element;
if (file.isDirectory())
return file.getParent() != null ? folderImage : driveImage;
return fileImage;
}

@Override
public String getText(Object element) {
String fileName = ((File) element).getName();
if (fileName.length() > 0) {
return fileName;
}
return ((File) element).getPath();
}
}

For the label provider you need the referred icons in your folder icons. You can use the following download.

Download the Icons

Adjust then the view.

package de.vogella.rcp.intro.filebrowser;

import java.awt.Desktop;
import java.io.File;
import java.io.IOException;

import org.eclipse.jface.viewers.IOpenListener;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.OpenEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.part.ViewPart;

import de.vogella.rcp.intro.filebrowser.provider.FileContentProvider;
import de.vogella.rcp.intro.filebrowser.provider.FileLabelProvider;

public class View extends ViewPart {
	public static final String ID = "de.vogella.rcp.intro.filebrowser.view";
	private TreeViewer viewer;

	public void createPartControl(Composite parent) {
		viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
		viewer.setContentProvider(new FileContentProvider());
		viewer.setLabelProvider(new FileLabelProvider());
		viewer.setInput(File.listRoots());
		viewer.addOpenListener(new IOpenListener() {

			@Override
			public void open(OpenEvent event) {
				IStructuredSelection selection = (IStructuredSelection) event
						.getSelection();

				File file = (File) selection.getFirstElement();
				if (Desktop.isDesktopSupported()) {
					Desktop desktop = Desktop.getDesktop();
					if (desktop.isSupported(Desktop.Action.OPEN)) {
						try {
							desktop.open(file);
						} catch (IOException e) {
							// DO NOTHING
						}
					}
				}
			}
		});
	}

	public void setFocus() {
		viewer.getControl().setFocus();
	}
}

Filed under: Eclipse

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