Java Dialog with jList and option buttons

Question

I would like a Dialog box that contains a JList for user selection. Whilst the following will do this I would also like a message and a 'cancel' button.

list = new JList(LstArray1.toArray());
JOptionPane.showMessageDialog(
 null, list, "Title", JOptionPane.INFORMATION_MESSAGE);

So more like this but changing the combobox to the JList.

String input = (String) JOptionPane.showInputDialog (null, "Choose from list", "title", JOptionPane.INFORMATION_MESSAGE, null, LstArray2.toArray(), LstArray2.get(0));

I've looked at the following but cannot seem to find quite what I need. http://docs.oracle.com/javase/tutorial/uiswing/components/dialog.html

Answer 1

This mightn't be exactly what you're looking for, but hopefully it will provide a basis for what you need or spark an alternative approach of your own:

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

public class ListDialog {
    private JList list;
    private JLabel label;
    private JOptionPane optionPane;
    private JButton okButton, cancelButton;
    private ActionListener okEvent, cancelEvent;
    private JDialog dialog;

    public ListDialog(String message, JList listToDisplay){
        list = listToDisplay;
        label = new JLabel(message);
        createAndDisplayOptionPane();
    }

    public ListDialog(String title, String message, JList listToDisplay){
        this(message, listToDisplay);
        dialog.setTitle(title);
    }

    private void createAndDisplayOptionPane(){
        setupButtons();
        JPanel pane = layoutComponents();
        optionPane = new JOptionPane(pane);
        optionPane.setOptions(new Object[]{okButton, cancelButton});
        dialog = optionPane.createDialog("Select option");
    }

    private void setupButtons(){
        okButton = new JButton("Ok");
        okButton.addActionListener(e -> handleOkButtonClick(e));

        cancelButton = new JButton("Cancel");
        cancelButton.addActionListener(e -> handleCancelButtonClick(e));
    }

    private JPanel layoutComponents(){
        centerListElements();
        JPanel panel = new JPanel(new BorderLayout(5,5));
        panel.add(label, BorderLayout.NORTH);
        panel.add(list, BorderLayout.CENTER);
        return panel;
    }

    private void centerListElements(){
        DefaultListCellRenderer renderer = (DefaultListCellRenderer) list.getCellRenderer();
        renderer.setHorizontalAlignment(SwingConstants.CENTER);
    }

    public void setOnOk(ActionListener event){ okEvent = event; }

    public void setOnClose(ActionListener event){
        cancelEvent  = event;
    }

    private void handleOkButtonClick(ActionEvent e){
        if(okEvent != null){ okEvent.actionPerformed(e); }
        hide();
    }

    private void handleCancelButtonClick(ActionEvent e){
        if(cancelEvent != null){ cancelEvent.actionPerformed(e);}
        hide();
    }

    public void show(){ dialog.setVisible(true); }

    private void hide(){ dialog.setVisible(false); }

    public Object getSelectedItem(){ return list.getSelectedValue(); }
}

example usage:

JList list = new JList(new String[] {"foo", "bar", "foobar"});
        ListDialog dialog = new ListDialog("Please select an item in the list: ", list);
        dialog.setOnOk(e -> System.out.println("Chosen item: " + dialog.getSelectedItem()));
        dialog.show();

Feel free to use/modify the above and if you have any questions ask below