类似于Windows资源管理器的Tree

import java.io.File; import org.eclipse.swt.SWT; import org.eclipse.swt.graphics.Point; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeItem; public class ExplorerTree { public static void main(String[] args) { final Display display = new Display(); final Shell shell = new Shell(display); shell.setText("Lazy Tree"); shell.setLayout(new FillLayout()); final Tree tree = new Tree(shell, SWT.BORDER); File[] roots = File.listRoots(); for (int i = 0; i < roots.length; i++) { TreeItem root = new TreeItem(tree, 0); root.setText(roots[i].toString()); root.setData(roots[i]);// 保存当前节点数据 new TreeItem(root, 0);// 把当前节点作为目录节点 } tree.addListener(SWT.Expand, new Listener() { public void handleEvent(final Event event) { final TreeItem root = (TreeItem) event.item; TreeItem[] items = root.getItems(); for (int i = 0; i < items.length; i++) { if (items[i].getData() != null) return; items[i].dispose(); } File file = (File) root.getData(); File[] files = file.listFiles(); if (files == null) return; for (int i = 0; i < files.length; i++) { TreeItem item = new TreeItem(root, 0); item.setText(files[i].getName()); item.setData(files[i]); if (files[i].isDirectory()) { new TreeItem(item, 0); } } } }); tree.addListener(SWT.MouseDoubleClick, new Listener() { public void handleEvent(Event event) { Point point = new Point(event.x, event.y); TreeItem item = tree.getItem(point); if (item != null) { System.out.println("Mouse down: " + item); } } }); // 根据Tree的大小更改shell的大小 Point size = tree.computeSize(300, SWT.DEFAULT); int width = Math.max(300, size.x); int height = Math.max(300, size.y); shell.setSize(shell.computeSize(width, height)); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } }