Implement drag & drop functionality in your application
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.Transferable;
import java.awt.dnd.DnDConstants;
import java.awt.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextArea;
public class Main extends JFrame implements DropTargetListener {
DropTarget dt;
JTextArea ta = new JTextArea();
public Main() {
super("Drop Test");
setSize(300, 300);
getContentPane()
.add(new JLabel("Drop something here:"), BorderLayout.NORTH);
ta.setBackground(Color.white);
getContentPane().add(ta, BorderLayout.CENTER);
dt = new DropTarget(ta, this);
setVisible(true);
}
public void dragEnter(DropTargetDragEvent dtde) {
System.out.println("Drag Enter");
}
public void dragExit(DropTargetEvent dte) {
System.out.println("Drag Exit");
}
public void dragOver(DropTargetDragEvent dtde) {
System.out.println("Drag Over");
}
public void dropActionChanged(DropTargetDragEvent dtde) {
System.out.println("Drop Action Changed");
}
public void drop(DropTargetDropEvent dtde) {
try {
Transferable tr = dtde.getTransferable();
DataFlavor[] flavors = tr.getTransferDataFlavors();
for (int i = 0; i < flavors.length; i++) {
if (flavors[i].isFlavorJavaFileListType()) {
dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
List list = (List) tr.getTransferData(flavors[i]);
for (int j = 0; j < list.size(); j++) {
ta.append(list.get(j) + "\n");
}
dtde.dropComplete(true);
return;
} else if (flavors[i].isFlavorSerializedObjectType()) {
dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
Object o = tr.getTransferData(flavors[i]);
ta.append("Object: " + o);
dtde.dropComplete(true);
return;
} else if (flavors[i].isRepresentationClassInputStream()) {
dtde.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
ta.read(new InputStreamReader((InputStream) tr.getTransferData(flavors[i])),
"from system clipboard");
dtde.dropComplete(true);
return;
}
}
dtde.rejectDrop();
} catch (Exception e) {
e.printStackTrace();
dtde.rejectDrop();
}
}
public static void main(String args[]) {
new Main();
}
}
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