The general way to use a TreeViewer:
Creating a TreeViewer
Creating a content provider class and setting it on the TreeViewer using setContentProvider()
Creating a label provider class and setting it on the TreeViewer using setLabelProvider()
Setting the root input for the tree using setInput()
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class FileTreeWindowApplication {
public static void main(String[] args) {
FileTreeWindow main = new FileTreeWindow();
}
}
class FileTreeWindow extends ApplicationWindow {
public FileTreeWindow() {
super(null);
// Don't return from open() until window closes
setBlockOnOpen(true);
open();
Display.getCurrent().dispose();
}
protected void configureShell(Shell shell) {
super.configureShell(shell);
shell.setSize(400, 400);
}
protected Control createContents(Composite parent) {
Composite composite = new Composite(parent, SWT.NONE);
composite.setLayout(new FillLayout());
final TreeViewer tv = new TreeViewer(composite);
tv.getTree().setLayoutData(new GridData(GridData.FILL_BOTH));
tv.setContentProvider(new FileTreeContentProvider());
tv.setLabelProvider(new FileTreeLabelProvider());
tv.setInput("root");
return composite;
}
}
class FileTreeContentProvider implements ITreeContentProvider {
public Object[] getChildren(Object arg0) {
return ((File) arg0).listFiles();
}
public Object getParent(Object arg0) {
return ((File) arg0).getParentFile();
}
public boolean hasChildren(Object arg0) {
Object[] obj = getChildren(arg0);
return obj == null ? false : obj.length > 0;
}
public Object[] getElements(Object arg0) {
return File.listRoots();
}
public void dispose() {
}
public void inputChanged(Viewer arg0, Object arg1, Object arg2) {
}
}
class FileTreeLabelProvider implements ILabelProvider {
private List listeners;
private Image file;
private Image dir;
public FileTreeLabelProvider() {
listeners = new ArrayList();
try {
file = new Image(null, new FileInputStream("images/file.gif"));
dir = new Image(null, new FileInputStream("images/directory.gif"));
} catch (FileNotFoundException e) {
}
}
public Image getImage(Object arg0) {
return ((File) arg0).isDirectory() ? dir : file;
}
public String getText(Object arg0) {
String text = ((File) arg0).getName();
if (((File) arg0).getName().length() == 0) {
text = ((File) arg0).getPath();
}
return text;
}
public void addListener(ILabelProviderListener arg0) {
listeners.add(arg0);
}
public void dispose() {
// Dispose the images
if (dir != null)
dir.dispose();
if (file != null)
file.dispose();
}
public boolean isLabelProperty(Object arg0, String arg1) {
return false;
}
public void removeListener(ILabelProviderListener arg0) {
listeners.remove(arg0);
}
}