|
/**
* @version 1.00 1999-09-11
* @author Cay Horstmann
*/
import java.awt.Container;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DragGestureEvent;
import java.awt.dnd.DragGestureListener;
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 java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JScrollPane;
public class DragSourceTest {
public static void main(String[] args) {
JFrame frame = new DragSourceFrame();
frame.show();
}
}
class DragSourceFrame extends JFrame implements DragSourceListener,
DragGestureListener {
public DragSourceFrame() {
setTitle("DragSourceTest");
setSize(300, 200);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
Container contentPane = getContentPane();
File f = new File(".").getAbsoluteFile();
File[] files = f.listFiles();
model = new DefaultListModel();
for (int i = 0; i < files.length; i++)
model.addElement(files[i]);
fileList = new JList(model);
contentPane.add(new JScrollPane(fileList), "Center");
contentPane.add(new JLabel("Drag files from this list"), "North");
DragSource dragSource = DragSource.getDefaultDragSource();
dragSource.createDefaultDragGestureRecognizer(fileList,
DnDConstants.ACTION_COPY_OR_MOVE, this);
}
// DragGestureListener method
public void dragGestureRecognized(DragGestureEvent event) {
draggedValues = fileList.getSelectedValues();
Transferable transferable = new FileListTransferable(draggedValues);
event.startDrag(null, transferable, this);
}
// DragSourceListener methods
public void dragEnter(DragSourceDragEvent event) {
}
public void dragOver(DragSourceDragEvent event) {
}
public void dragExit(DragSourceEvent event) {
}
public void dropActionChanged(DragSourceDragEvent event) {
}
public void dragDropEnd(DragSourceDropEvent event) {
if (event.getDropSuccess()) {
int action = event.getDropAction();
if (action == DnDConstants.ACTION_MOVE) {
for (int i = 0; i < draggedValues.length; i++)
model.removeElement(draggedValues[i]);
}
}
}
private JList fileList;
private DefaultListModel model;
private Object[] draggedValues;
}
class FileListTransferable implements Transferable {
public FileListTransferable(Object[] files) {
fileList = new ArrayList(Arrays.asList(files));
}
public DataFlavor[] getTransferDataFlavors() {
return flavors;
}
public boolean isDataFlavorSupported(DataFlavor flavor) {
return Arrays.asList(flavors).contains(flavor);
}
public synchronized Object getTransferData(DataFlavor flavor)
throws UnsupportedFlavorException {
if (flavor.equals(DataFlavor.javaFileListFlavor)) {
return fileList;
} else if (flavor.equals(DataFlavor.stringFlavor)) {
return fileList.toString();
} else {
throw new UnsupportedFlavorException(flavor);
}
}
private static DataFlavor[] flavors = { DataFlavor.javaFileListFlavor,
DataFlavor.stringFlavor };
private java.util.List fileList;
}
|
