import java.awt.*;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
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.dnd.DropTarget;
import java.awt.dnd.DropTargetDragEvent;
import java.awt.dnd.DropTargetDropEvent;
import java.awt.dnd.DropTargetEvent;
import java.awt.dnd.DropTargetListener;

import java.awt.image.BufferedImage;
import java.io.IOException;



public class DragAndDropExample {

    public static void main(String[] args) {
        // Create a frame
        Frame frame = new Frame("Example Frame");

    /*
* Create a container with a flow layout, which arranges its children
* horizontally and center aligned. A container can also be created with
* a specific layout using Panel(LayoutManager) constructor, e.g.
* Panel(new FlowLayout(FlowLayout.RIGHT)) for right alignment
*/

        Panel panel = new Panel();
        // Add a drop target text area in the center of the frame
        Component textArea = new DropTargetTextArea();
        frame.add(textArea, BorderLayout.CENTER);

        // Add several draggable labels to the container
        Label helloLabel = new DraggableLabel("Hello");
        Label worldLabel = new DraggableLabel("World");

        panel.add(helloLabel);
        panel.add(worldLabel);

        // Add the container to the bottom of the frame
        frame.add(panel, BorderLayout.SOUTH);



        // Display the frame

        int frameWidth = 300;
        int frameHeight = 300;

        frame.setSize(frameWidth, frameHeight);

        frame.setVisible(true);
    }



            // Make a Label draggable; You can use the example to make any component draggable

    public static class DraggableLabel extends Label implements DragGestureListener, DragSourceListener {

        DragSource dragSource;

        public DraggableLabel(String text) {
            setText(text);
            dragSource = new DragSource();
            dragSource.createDefaultDragGestureRecognizer(this, DnDConstants.ACTION_COPY_OR_MOVE, this);

        }



        public void dragGestureRecognized(DragGestureEvent evt) {
            Transferable transferable = new StringSelection(getText());

            BufferedImage _image = new BufferedImage(30, 30, BufferedImage.TYPE_INT_ARGB);
            Graphics2D g2d = _image.createGraphics();
            g2d.setColor(Color.red);
            g2d.fillRect(0,0,30,30);
            if ( this.getText().equals("Hello")) {
            dragSource.startDrag(evt, DragSource.DefaultCopyDrop,_image ,new Point(1, 1), transferable, this);
            } else {
                dragSource.startDrag(evt, DragSource.DefaultCopyDrop, transferable, this);
            }

        }



        public void dragEnter(DragSourceDragEvent evt) {

// Called when the user is dragging this drag source and enters the drop target
            System.out.println("Drag enter");

        }



        public void dragOver(DragSourceDragEvent evt) {

// Called when the user is dragging this drag source and moves over the drop target
            System.out.println("Drag over");

        }



        public void dragExit(DragSourceEvent evt) {
// Called when the user is dragging this drag source and leaves the drop target
            System.out.println("Drag exit");

        }



        public void dropActionChanged(DragSourceDragEvent evt) {
// Called when the user changes the drag action between copy or move
            System.out.println("Drag action changed");

        }



        public void dragDropEnd(DragSourceDropEvent evt) {
// Called when the user finishes or cancels the drag operation
            System.out.println("Drag action End");

        }



    }



            // Make a TextArea a drop target; You can use the example to make any component a drop target

    public static class DropTargetTextArea extends TextArea implements DropTargetListener {



        public DropTargetTextArea() {
            new DropTarget(this, this);

        }



        public void dragEnter(DropTargetDragEvent evt) {
// Called when the user is dragging and enters this drop target
            System.out.println("Drop enter");

        }



        public void dragOver(DropTargetDragEvent evt) {
// Called when the user is dragging and moves over this drop target
            System.out.println("Drop over");
            System.out.println(MouseInfo.getPointerInfo().getLocation().y);
        }



        public void dragExit(DropTargetEvent evt) {
// Called when the user is dragging and leaves this drop target
            System.out.println("Drop exit");
        }



        public void dropActionChanged(DropTargetDragEvent evt) {
// Called when the user changes the drag action between copy or move
            System.out.println("Drop action changed");

        }



        public void drop(DropTargetDropEvent evt) {
// Called when the user finishes or cancels the drag operation
            try {
                Transferable transferable = evt.getTransferable();
                if (transferable.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                    evt.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);
                    String dragContents = (String) transferable.getTransferData(DataFlavor.stringFlavor);
                    evt.getDropTargetContext().dropComplete(true);
                    // We append the label text to the text area when dropped
                    setText(getText() + " " + dragContents);
                } else {
                    evt.rejectDrop();
                }
            } catch (IOException e) {
                evt.rejectDrop();
            } catch (UnsupportedFlavorException e) {
                evt.rejectDrop();
            }
        }

    }

}