Mega Code Archive
Create TreeView based on your own tree node structure
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import java.util.Vector;
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.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
public class TreeViewBasedOnNode {
static Display display = new Display();
static Shell shell = new Shell(display);
static final Tree tree = new Tree(shell, SWT.BORDER);
static Vector nodes = new Vector();
public static void traditional() {
for (int i = 0; nodes != null && i < nodes.size(); i++) {
Node node = (Node) nodes.elementAt(i);
addNode(null, node);
}
}
private static void addNode(TreeItem parentItem, Node node) {
TreeItem item = null;
if (parentItem == null)
item = new TreeItem(tree, SWT.NONE);
else
item = new TreeItem(parentItem, SWT.NONE);
item.setText(node.getName());
Vector subs = node.getSubCategories();
for (int i = 0; subs != null && i < subs.size(); i++)
addNode(item, (Node) subs.elementAt(i));
}
public static void main(String[] args) {
Node category = new Node("A", null);
nodes.add(category);
category = new Node("a1", category);
new Node("a11", category);
new Node("a12", category);
category = new Node("B", null);
nodes.add(category);
new Node("b1", category);
new Node("b2", category);
TreeViewer treeViewer = new TreeViewer(tree);
treeViewer.setContentProvider(new MyTreeContentProvider());
treeViewer.setLabelProvider(new MyLabelProvider());
treeViewer.setInput(nodes);
tree.setSize(300, 200);
shell.setSize(300, 200);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
}
class MyLabelProvider implements ILabelProvider {
public String getText(Object element) {
return ((Node) element).getName();
}
public Image getImage(Object arg0) {
return null;
}
public void addListener(ILabelProviderListener arg0) {
}
public void dispose() {
}
public boolean isLabelProperty(Object arg0, String arg1) {
return false;
}
public void removeListener(ILabelProviderListener arg0) {
}
}
class MyTreeContentProvider implements ITreeContentProvider{
public Object[] getChildren(Object parentElement) {
Vector subcats = ((Node) parentElement).getSubCategories();
return subcats == null ? new Object[0] : subcats.toArray();
}
public Object getParent(Object element) {
return ((Node) element).getParent();
}
public boolean hasChildren(Object element) {
return ((Node) element).getSubCategories() != null;
}
public Object[] getElements(Object inputElement) {
if (inputElement != null && inputElement instanceof Vector) {
return ((Vector) inputElement).toArray();
}
return new Object[0];
}
public void dispose() {
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
}
}
class Node {
private String name;
private Vector subCategories;
private Node parent;
public Node(String name, Node parent) {
this.name = name;
this.parent = parent;
if (parent != null)
parent.addSubCategory(this);
}
public Vector getSubCategories() {
return subCategories;
}
private void addSubCategory(Node subcategory) {
if (subCategories == null)
subCategories = new Vector();
if (!subCategories.contains(subcategory))
subCategories.add(subcategory);
}
public String getName() {
return name;
}
public Node getParent() {
return parent;
}
}
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