Question

Please have a look at the following code

Main.Java

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;


public class Main extends JFrame
{
    private JButton ok;

    public Main()
    {
        ok = new JButton("OK");
        ok.addActionListener(new ButtonAction());

        JPanel panel = new JPanel();
        panel.setLayout(new FlowLayout());
        panel.add(ok);

        getContentPane().add(panel,"South");

        this.setVisible(true);
        this.setSize(new Dimension(200,200));
        this.validate();
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }

    public static void main(String[]args)
    {
        try
        {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            new Main();
        }
        catch(Exception e)
        {

        }
    }

    private class ButtonAction implements ActionListener
    {
        public void actionPerformed(ActionEvent ae)
        {
            Dialog d = new Dialog();
            d.setVisible(true);
        }
    }

}

Dialog.java

import java.awt.Event;
import java.awt.*;
import javax.swing.*;


public class Dialog extends JDialog
{
    private JButton done;

    public Dialog()
    {
        done = new JButton("Done");

        this.add(done);

        this.setSize(new Dimension(400,200));
    }

}

In here, I want to “attach” the Dialog form to the main form. Which means, when I click the OK button in Main.Java, Dialog form will get attached to the right side of the main form. So, when I move the main form, the dialog also get moved. However, dialog form should be independent, which means, when I click “x” button in dialog form, only that form exists, not the main form.

How can I attach this dialog form, to the right side of the main form, when the button is clicked? Please help!

Answer 1

The answer is not MouseListener, but it is ComponentListener. I managed to do it with using that listener’s “componentMoved()” method.

Main.java

import java.awt.event.*;
import java.awt.*;
import javax.swing.*;

public class Main extends JFrame implements ComponentListener, ActionListener
{
    private JButton ok;
    private Dialog dialog;

    public Main()
    {
        ok = new JButton("OK");
        ok.addActionListener(this);

        dialog = new Dialog();

        JPanel panel = new JPanel();
        panel.setLayout(new FlowLayout());
        panel.add(ok);

        getContentPane().add(panel,"South");

        this.addComponentListener(this);

        this.setVisible(true);
        this.setSize(new Dimension(200,200));
        this.validate();
        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    public static void main(String[]args)
    {
        try
        {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            new Main();
        }
        catch(Exception e){}
    }

    public void actionPerformed(ActionEvent ae)
    {   
        dialog.setVisible(true);
    }

    @Override
    public void componentHidden(ComponentEvent arg0) {}

    @Override
    public void componentMoved(ComponentEvent arg0) 
    {
        int x = this.getX() + this.getWidth();
        int y = this.getY();

        dialog.setDialogLocation(x, y);
    }

    @Override
    public void componentResized(ComponentEvent arg0) {}

    @Override
    public void componentShown(ComponentEvent arg0) {}
}

Dialog.java

import java.awt.Dimension;

import javax.swing.JButton;
import javax.swing.JDialog;


public class Dialog extends JDialog
{
    private JButton done;

    public Dialog()
    {
        done = new JButton("Done");

        this.add(done);

        this.setSize(new Dimension(400,200));
    }

    public void setDialogLocation(int x, int y)
    {
        this.setLocation(x, y);
    }

}