在java dnd期间检测按键

import java.awt.*;
import java.awt.datatransfer.*;
import java.awt.dnd.*;
import java.awt.event.*;

public class KeyPressDuringDND {
    public static void main(String[] args) {
        DragSource dragSource = DragSource.getDefaultDragSource();
        DragGestureRecognizer recognizer = dragSource.createDefaultDragGestureRecognizer(
                new Button("Draggable Button"), DnDConstants.ACTION_COPY_OR_MOVE, new DragGestureListener() {
                    @Override
                    public void dragGestureRecognized(DragGestureEvent dge) {
                        Transferable transferable = new StringSelection("Data to be dragged");
                        dge.startDrag(null, transferable);
                    }
                });

        DropTarget dropTarget = new DropTarget();
        dropTarget.addDropTargetListener(new DropTargetAdapter() {
            @Override
            public void dragEnter(DropTargetDragEvent dtde) {
                // Check for key press during DND
                if ((dtde.getDropAction() & DnDConstants.ACTION_COPY_OR_MOVE) != 0) {
                    if ((dtde.getDropAction() & DnDConstants.ACTION_COPY) != 0) {
                        if ((dtde.getSourceActions() & DnDConstants.ACTION_COPY) != 0) {
                            // Key press detected during DND
                            System.out.println("Key press detected during DND: COPY");
                        }
                    } else if ((dtde.getDropAction() & DnDConstants.ACTION_MOVE) != 0) {
                        if ((dtde.getSourceActions() & DnDConstants.ACTION_MOVE) != 0) {
                            // Key press detected during DND
                            System.out.println("Key press detected during DND: MOVE");
                        }
                    }
                }
            }
        });
    }
}