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Simple DND (Drag and Drop) Example

import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.DND; import org.eclipse.swt.dnd.DragSource; import org.eclipse.swt.dnd.DragSourceAdapter; import org.eclipse.swt.dnd.DragSourceEvent; import org.eclipse.swt.dnd.DropTarget; import org.eclipse.swt.dnd.DropTargetAdapter; import org.eclipse.swt.dnd.DropTargetEvent; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Button; 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 SimpleDNDExample {   public static void main(String[] args) {     Shell shell = new Shell();     shell.setLayout(new FillLayout());     // Create the tree and some tree items     final Tree tree = new Tree(shell, SWT.NONE);     TreeItem item1 = new TreeItem(tree, SWT.NONE);     item1.setText("Item 1");     TreeItem item2 = new TreeItem(tree, SWT.NONE);     item2.setText("Item 2");     TreeItem item3 = new TreeItem(tree, SWT.NONE);     item3.setText("Item 3");     TreeItem item4 = new TreeItem(tree, SWT.NONE);     item4.setText("Item 4");     // Create the drag source on the tree     DragSource ds = new DragSource(tree, DND.DROP_MOVE);     ds.setTransfer(new Transfer[] { TextTransfer.getInstance() });     ds.addDragListener(new DragSourceAdapter() {       public void dragSetData(DragSourceEvent event) {         // Set the data to be the first selected item's text         event.data = tree.getSelection()[0].getText();       }     });     // Create the button     final Button button = new Button(shell, SWT.FLAT);     button.setText("Button");     button.setAlignment(SWT.CENTER);     // Create the drop target on the button     DropTarget dt = new DropTarget(button, DND.DROP_MOVE);     dt.setTransfer(new Transfer[] { TextTransfer.getInstance() });     dt.addDropListener(new DropTargetAdapter() {       public void drop(DropTargetEvent event) {         // Set the buttons text to be the text being dropped         button.setText((String) event.data);       }     });     shell.pack();     shell.open();     Display display = Display.getDefault();     while (!shell.isDisposed())       if (!display.readAndDispatch())         display.sleep();     display.dispose();   } }