Вот небольшой пример:
public static void main(String[] args)
{
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new GridLayout(1, true));
final Tree tree = new Tree(shell, SWT.SINGLE);
tree.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
/* initialize columns */
TreeItem cosmetics = new TreeItem(tree, SWT.NONE);
cosmetics.setText(0, "cosmetics");
/* other text */
TreeItem powder= new TreeItem(tree, SWT.NONE);
powder.setText(0, "powder");
/* other text */
/* add selection listener to add children */
tree.addListener(SWT.Selection, new Listener()
{
@Override
public void handleEvent(Event arg0)
{
/* get selection */
TreeItem[] items = tree.getSelection();
if(items.length > 0)
{
String parent = items[0].getText();
System.out.println(parent);
/* add new child */
TreeItem newItem = new TreeItem(items[0], SWT.NONE);
newItem.setText(0, "new Item, parent: " + parent);
/* Expand parent */
items[0].setExpanded(true);
}
}
});
shell.pack();
shell.open();
while (!shell.isDisposed())
{
if (!display.readAndDispatch())
display.sleep();
}
display.dispose();
}
Он добавит нового ребенка в каждый TreeItem
, который вы нажмете.