Java tutorial
/* Java Swing, 2nd Edition By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole ISBN: 0-596-00408-7 Publisher: O'Reilly */ // DragTest.java //A simple (?) test of the DragSource classes to see if we //can create a draggable object in a Java application. This version //works with 1.3 and higher SDKs. // import java.awt.BorderLayout; import java.awt.datatransfer.StringSelection; import java.awt.dnd.DnDConstants; import java.awt.dnd.DragGestureEvent; import java.awt.dnd.DragGestureListener; import java.awt.dnd.DragGestureRecognizer; import java.awt.dnd.DragSource; import java.awt.dnd.DragSourceDragEvent; import java.awt.dnd.DragSourceDropEvent; import java.awt.dnd.DragSourceEvent; import java.awt.dnd.DragSourceListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.JFrame; import javax.swing.JList; import javax.swing.JScrollPane; import javax.swing.ListSelectionModel; public class DragTest extends JFrame implements DragSourceListener, DragGestureListener { DragSource ds; JList jl; StringSelection transferable; String[] items = { "Java", "C", "C++", "Lisp", "Perl", "Python" }; public DragTest() { super("Drag Test"); setSize(200, 150); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { System.exit(0); } }); jl = new JList(items); jl.setSelectionMode(ListSelectionModel.SINGLE_SELECTION); getContentPane().add(new JScrollPane(jl), BorderLayout.CENTER); ds = new DragSource(); DragGestureRecognizer dgr = ds.createDefaultDragGestureRecognizer(jl, DnDConstants.ACTION_COPY, this); setVisible(true); } public void dragGestureRecognized(DragGestureEvent dge) { System.out.println("Drag Gesture Recognized!"); transferable = new StringSelection(jl.getSelectedValue().toString()); ds.startDrag(dge, DragSource.DefaultCopyDrop, transferable, this); } public void dragEnter(DragSourceDragEvent dsde) { System.out.println("Drag Enter"); } public void dragExit(DragSourceEvent dse) { System.out.println("Drag Exit"); } public void dragOver(DragSourceDragEvent dsde) { System.out.println("Drag Over"); } public void dragDropEnd(DragSourceDropEvent dsde) { System.out.print("Drag Drop End: "); if (dsde.getDropSuccess()) { System.out.println("Succeeded"); } else { System.out.println("Failed"); } } public void dropActionChanged(DragSourceDragEvent dsde) { System.out.println("Drop Action Changed"); } public static void main(String args[]) { new DragTest(); } }