Drag and Drop problem

[Punit Jain]

here is some classes:


AbstractDropManager.java

package test;
import java.awt.Point;
import java.awt.Rectangle;

import javax.swing.JComponent;
import javax.swing.SwingUtilities;

public class AbstractDropManager implements DropListener {
	protected JComponent component;

	public AbstractDropManager() {
		this(null);
	}
	
	public AbstractDropManager(JComponent component) {
		this.component = component;
	}

	protected Point getTranslatedPoint(Point point) {
        Point p = (Point) point.clone();
        SwingUtilities.convertPointFromScreen(p, component);
		return p;
	}

	protected boolean isInTarget(Point point) {
		Rectangle bounds = component.getBounds();
		return bounds.contains(point);
	}

	public void Dropped(DropEvent e) {
	}


}

AnswerClassNew.java

package test;

public class AnswerClassNew {
	String answer1="class";
	String answer2="Abstraction";
	String answer3="Method";
	String answer4="Inheritance";
	String Question="What is a Class????????";
	public void getAnswerOne(String answer1)
	{
		this.answer1=answer1;
	}
	public String setAnswerOne()
	{
		return answer1;
	}
	public void getAnswerTwo(String answer2)
	{
		this.answer2=answer2;
	}
	public String setAnswerTwo()
	{
		return answer2;
	}
	public void getAnswerThree(String answer3)
	{
		this.answer3=answer3;
	}
	public String setAnswerThree()
	{
		return answer3;
	}
	public void getAnswerFour(String answer4)
	{
		this.answer4=answer4;
	}
	public String setAnswerFour()
	{
		return answer4;
	}
	public void getQuestion(String Question)
	{
		this.Question=Question;
	}
	public String setQuestion()
	{
		return Question;
	}
}

ComponentAdapter.java

package test;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;

import javax.swing.SwingUtilities;
public class ComponentAdapter extends DropAdapter{
	 public ComponentAdapter(GlassPane glassPane, String action) {
	        super(glassPane, action);
	    }

	    public void mousePressed(MouseEvent e)
	    {
	        Component c = e.getComponent();

	        BufferedImage image = new BufferedImage(c.getWidth(), c.getHeight(), BufferedImage.TYPE_INT_ARGB);
	        Graphics g = image.getGraphics();
	        c.paint(g);

	        glassPane.setVisible(true);

	        Point p = (Point) e.getPoint().clone();
	        SwingUtilities.convertPointToScreen(p, c);
	        SwingUtilities.convertPointFromScreen(p, glassPane);

	        glassPane.setPoint(p);
	        glassPane.setImage(image);
	        glassPane.repaint();
	    }

	    public void mouseReleased(MouseEvent e)
	    {
	        Component c = e.getComponent();

	        Point p = (Point) e.getPoint().clone();
	        SwingUtilities.convertPointToScreen(p, c);

	        Point eventPoint = (Point) p.clone();
	        SwingUtilities.convertPointFromScreen(p, glassPane);

	        glassPane.setPoint(p);
	        glassPane.setVisible(false);
	        glassPane.setImage(null);

	        fireDropEvent(new DropEvent(action, eventPoint));
	    }


}

DragnDemo.java

package test;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.*;

public class DragnDemo extends JFrame{
    private GlassPane glassPane;

    public DragnDemo ()
    {
	//super ("Welcome");
	setDefaultCloseOperation (EXIT_ON_CLOSE);
	glassPane = new GlassPane ();
	setGlassPane (glassPane);
	//JPanel c=new JPanel(new BorderLayout());

	JTextField txtField = new JTextField (20);

	DropListener listener = new DropManagerDemo (txtField,txtField);

	ComponentAdapter componentAdapter;
	
	Container c = getContentPane ();
	c.setLayout (new BorderLayout ());


	JPanel buttons = new JPanel ();
	JLabel lbl,lbl2,lbl3,lbl4;

	AnswerClassNew acn=new AnswerClassNew();
	String mess1=acn.setAnswerOne();

	lbl=new JLabel(mess1);
	//lbl.setForeground(getForeground());
	lbl.setBackground(Color.cyan);
	String message2=lbl.getText();

    buttons.add (lbl);
    
	lbl.addMouseListener (componentAdapter = new ComponentAdapter (glassPane, message2));
	componentAdapter.addDropListener (listener);
	lbl.addMouseMotionListener (new MotionAdapter (glassPane));


	String mess2=acn.setAnswerTwo();
	lbl2=new JLabel(mess2);
	lbl2.setBackground(Color.green);
	String message3=lbl2.getText();


	buttons.add (lbl2);
	lbl2.addMouseListener (componentAdapter = new ComponentAdapter (glassPane, message3));
	componentAdapter.addDropListener (listener);
	lbl2.addMouseMotionListener (new MotionAdapter (glassPane));

	String mess3=acn.setAnswerThree();
	lbl3=new JLabel(mess3);
	String message4=lbl2.getText();


	buttons.add (lbl3);
	lbl3.addMouseListener (componentAdapter = new ComponentAdapter (glassPane, message4));
	componentAdapter.addDropListener (listener);
	lbl3.addMouseMotionListener (new MotionAdapter (glassPane));

	String mess4=acn.setAnswerFour();
	lbl4=new JLabel(mess4);
	String message5=lbl4.getText();


	buttons.add (lbl4);
	lbl4.addMouseListener (componentAdapter = new ComponentAdapter (glassPane, message5));
	componentAdapter.addDropListener (listener);
	lbl4.addMouseMotionListener (new MotionAdapter (glassPane));





	DropManagerDemo obj = new DropManagerDemo (glassPane,txtField);

	c.add (BorderLayout.SOUTH, buttons);
    
	JScrollPane scrollPane = new JScrollPane (txtField);
	scrollPane.addMouseListener (new ComponentAdapter (glassPane, "Textfield"));
	scrollPane.addMouseMotionListener (new MotionAdapter (glassPane));


	c.add (BorderLayout.CENTER, scrollPane);

	JPanel headerPanel = new JPanel (new BorderLayout ());
	HeaderPanel header = new HeaderPanel ();
	headerPanel.add (BorderLayout.NORTH, header);
	headerPanel.add (BorderLayout.SOUTH, new JSeparator (JSeparator.HORIZONTAL));
	headerPanel.setBorder (new EmptyBorder (0, 0, 6, 0));
	c.add (BorderLayout.NORTH, headerPanel);


	pack ();
	setResizable (false);
	setLocationRelativeTo (null);
    }


    public static void main (String [] args)
    {
	DragnDemo demo = new DragnDemo ();
	demo.setVisible (true);
    }
}

DropAdapter.java

package test;
import java.awt.event.MouseAdapter;

import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;

public class DropAdapter extends MouseAdapter{
	protected GlassPane glassPane;
	protected String action;

	private List listeners;

    public DropAdapter(GlassPane glassPane, String action) {
        this.glassPane = glassPane;
        this.action = action;
        this.listeners = new ArrayList();
    }

    public void addDropListener(DropListener listener) {
        if (listener != null)
            listeners.add(listener);
    }

    public void removeDropListener(DropListener listener) {
        if (listener != null)
            listeners.remove(listener);
    }

    protected void fireDropEvent(DropEvent evt) {
        Iterator it = listeners.iterator();
        while (it.hasNext()) {
        	((DropListener) it.next()).Dropped(evt);
        }
    }

}

DropEvent.java

package test;
import java.awt.Point;

public class DropEvent {
	private Point point;
	private String action;

	public DropEvent(String action, Point point) {
		this.action = action;
		this.point = point;
	}

	public String getAction() {
		return action;
	}

	public Point getDropLocation() {
		return point;
	}


}

DropListener.java

package test;

public interface DropListener {
	public void Dropped(DropEvent e);

}

DropManagerDemo.java

package test;
import java.awt.Point;
import javax.swing.JComponent;
import javax.swing.JOptionPane;
import javax.swing.*;
public class DropManagerDemo extends AbstractDropManager {
    private JComponent target;
    JTextField testF;

    public DropManagerDemo(JComponent target,JTextField tF) {
	super(target);
	testF = tF;
    }

	public void Dropped(DropEvent e) {
	   String action = e.getAction();
	   Point p = getTranslatedPoint(e.getDropLocation());

	   if (isInTarget(p)) 
	   {
	       testF.setText(action);
	   }
	}


}

GlassPane.java

package test;
import java.awt.AlphaComposite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.image.BufferedImage;

import javax.swing.JPanel;

public class GlassPane extends JPanel
{
	private AlphaComposite composite;
    private BufferedImage dragged = null;
    private Point location = new Point(0, 0);

    public GlassPane()
    {
        setOpaque(false);
        composite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.5f);
    }

    public void setImage(BufferedImage dragged)
    {
        this.dragged = dragged;
    }

    public void setPoint(Point location)
    {
        this.location = location;
    }

    public void paintComponent(Graphics g)
    {
        if (dragged == null)
            return;

        Graphics2D g2 = (Graphics2D) g;
        g2.setComposite(composite);
        g2.drawImage(dragged,
                     (int) (location.getX() - (dragged.getWidth(this)  / 2)),
                     (int) (location.getY() - (dragged.getHeight(this) / 2)),
                     null);
    }


}

HeaderPanel.java

package test;

import java.awt.BorderLayout;
import java.awt.Font;
import java.awt.GridLayout;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;

public class HeaderPanel extends JPanel {
    public HeaderPanel() {
    	
    	JPanel titres = new JPanel(new GridLayout(3, 1));
    	titres.setOpaque(false);
    	titres.setBorder(new EmptyBorder(12, 0, 12, 0));

    	JLabel titreEnTete = new JLabel("Welcome");
    	Font police = titreEnTete.getFont().deriveFont(Font.BOLD);
    	titreEnTete.setFont(police);
    	titreEnTete.setBorder(new EmptyBorder(0, 12, 0, 0));
    	titres.add(titreEnTete);
    	AnswerClassNew acn=new AnswerClassNew();
    	String Questionget=acn.setQuestion();
    	JLabel titre;
    	titres.add(titre = new JLabel(Questionget));
    	police = titreEnTete.getFont().deriveFont(Font.PLAIN);
    	titre.setFont(police);
    	titre.setBorder(new EmptyBorder(0, 12, 0, 8));
    	

    	add(BorderLayout.WEST, titres);
    	add(BorderLayout.EAST, titre);

    	
        }



}

MotionAdapter.java

package test;
import java.awt.Color;
import java.awt.Component;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.awt.event.MouseMotionListener;

import javax.swing.JComponent;
import javax.swing.SwingUtilities;
public class MotionAdapter extends MouseAdapter implements MouseMotionListener {
	   private GlassPane glassPane;

		public MotionAdapter(GlassPane glassPane) {
			this.glassPane = glassPane;
		}

		public void mouseDragged(MouseEvent e)
	    {
	        Component c = e.getComponent();

	        Point p = (Point) e.getPoint().clone();
	        SwingUtilities.convertPointToScreen(p, c);
	        SwingUtilities.convertPointFromScreen(p, glassPane);
	        glassPane.setPoint(p);
	        glassPane.setBackground(Color.cyan);
	        glassPane.repaint();
	    }
		
		@Override
		public void mouseMoved(MouseEvent arg0) {
			// TODO Auto-generated method stub
			
		}
        
		//public void mouseOover(MouseEvent e)
		//{
			//		}

		@Override
		public void mouseEntered(MouseEvent e) {
			// TODO Auto-generated method stub
			//super.mouseEntered(arg0);
			JComponent comp=(JComponent) e.getSource();
			comp.setBackground(Color.cyan);
			System.out.println("Mouse entererd");

		}

		@Override
		public void mouseExited(MouseEvent e) {
			// TODO Auto-generated method stub
			//super.mouseExited(arg0);
			JComponent comp=(JComponent) e.getSource();
			comp.setBackground(Color.green);
			System.out.println("Mouse exited");
		}
		

}

Please Compile the class DragnDemo.java, it's successfully compiling and running, bt i need to add the drop listener for more text fields, i mean to say the text field which is visible to the form is one, i need to add more and that drop event should for all text field i will add, can anyone help me this..??


Thanks in advance.

[Rob Spoor]

Please condense your problem in a SSCCE. I don't think many people want to copy-paste 11 pieces of code.

[Darryl Burke]

Please BeForthrightWhenCrossPostingToOtherSites
http://www.java-forums.org/awt-swing/48782-drag-drop-problem.html

Also, credit should be given to the source of the code.
http://code.google.com/p/geometrees/