ListDialog.java

package org.aitools.programd.interfaces.graphical;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.BorderFactory;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;

/**
 */
public class ListDialog extends JDialog {

  /**
   * 
   */
  private static final long serialVersionUID = 1L;

  protected static ListDialog dialog;

  protected static String value = "";

  /**
   * Sets up the dialog. The first argument can be null, but it really should be a component in the dialog's controlling
   * frame.
   * 
   * @param comp the component to which to attach the dialog
   * @param possibleValues the possible values to show in the dialog
   * @param title the title of the dialog
   * @param labelText the text of the label in the dialog
   */
  public static void initialize(Component comp, String[] possibleValues, String title, String labelText) {
    Frame frame = JOptionPane.getFrameForComponent(comp);
    dialog = new ListDialog(frame, possibleValues, title, labelText);
  }

  /**
   * Show the initialized dialog. The first argument should be null if you want the dialog to come up in the center of
   * the screen. Otherwise, the argument should be the component on top of which the dialog should appear.
   * 
   * @param comp the component to which to set the relative location of the dialog
   * @param initialValue the initial value of the dialog
   * @return the value of the dialog
   */
  public static String showDialog(Component comp, String initialValue) {
    if (dialog != null) {
      dialog.setValue(initialValue);
      dialog.setLocationRelativeTo(comp);
      dialog.setVisible(true);
    }
    else {
      System.err.println("ListDialog requires you to call initialize before calling showDialog.");
    }
    return value;
  }

  protected JList list;

  protected ListDialog(Frame frame, Object[] data, String title, String labelText) {
    super(frame, title, true);

    JButton cancelButton = new JButton("Cancel");
    final JButton setButton = new JButton("Set");
    cancelButton.addActionListener(new ActionEventIgnoringActionListener() {

      @Override
      public void actionPerformed() {
        dialog.setVisible(false);
      }
    });
    setButton.addActionListener(new ActionEventIgnoringActionListener() {

      @Override
      public void actionPerformed() {
        ListDialog.value = (String) ListDialog.this.list.getSelectedValue();
        ListDialog.dialog.setVisible(false);
      }
    });
    this.getRootPane().setDefaultButton(setButton);

    this.list = new JList(data);
    this.list.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
    this.list.addMouseListener(new MouseAdapter() {

      @Override
      public void mouseClicked(MouseEvent e) {
        if (e.getClickCount() == 2) {
          setButton.doClick();
        }
      }
    });
    JScrollPane listScroller = new JScrollPane(this.list);
    listScroller.setPreferredSize(new Dimension(250, 80));

    // Must do the following, too, or else the scroller thinks it's taller
    // than it is:
    listScroller.setMinimumSize(new Dimension(250, 80));
    listScroller.setAlignmentX(LEFT_ALIGNMENT);

    // Create a container so that we can add a title around
    // the scroll pane. Can't add a title directly to the
    // scroll pane because its background would be white.
    // Lay out the label and scroll pane from top to button.
    JPanel listPane = new JPanel();
    listPane.setLayout(new BoxLayout(listPane, BoxLayout.Y_AXIS));
    JLabel label = new JLabel(labelText);
    label.setLabelFor(this.list);
    listPane.add(label);
    listPane.add(Box.createRigidArea(new Dimension(0, 5)));
    listPane.add(listScroller);
    listPane.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));

    // Lay out the buttons from left to right.
    JPanel buttonPane = new JPanel();
    buttonPane.setLayout(new BoxLayout(buttonPane, BoxLayout.X_AXIS));
    buttonPane.setBorder(BorderFactory.createEmptyBorder(0, 10, 10, 10));
    buttonPane.add(Box.createHorizontalGlue());
    buttonPane.add(cancelButton);
    buttonPane.add(Box.createRigidArea(new Dimension(10, 0)));
    buttonPane.add(setButton);

    // Put everything together, using the content pane's BorderLayout.
    Container contentPane = this.getContentPane();
    contentPane.add(listPane, BorderLayout.CENTER);
    contentPane.add(buttonPane, BorderLayout.SOUTH);

    this.pack();
  }

  protected void setValue(String newValue) {
    value = newValue;
    this.list.setSelectedValue(value, true);
  }
}