public class Popup_dialog extends JDialog
{
    PRivate Color TITLE_BAR_COLOR = com.holub.ui.Colors.LIGHT_YELLOW;
    private Color CLOSE_BOX_COLOR = com.holub.ui.Colors.DARK_RED;

    private JLabel title = new JLabel("xxxxxxxxxxxxxx");
    {   title.setHorizontalAlignment(SwingConstants.CENTER);
        title.setOpaque( false );
        title.setFont( title.getFont().deriveFont(Font.BOLD) );
    }

    private JPanel header = new JPanel();
    {   header.setBackground( TITLE_BAR_COLOR );
        header.setLayout( new BorderLayout() );
        header.setBorder( BorderFactory.createEmptyBorder(2,2,2,2) );
        header.add( title                   , BorderLayout.CENTER );
        header.add( create_close_button()   , BorderLayout.EAST   );
    }

    private JPanel content_pane = new JPanel();
    {   content_pane.setLayout( new BorderLayout() );
    }

    public Popup_dialog( Frame owner ){ super(owner); setModal(true); }
    public Popup_dialog( Dialog owner){ super(owner); setModal(true); }

    /* Code common to all constrUCtors. */
    {
        init_dragable();

        setUndecorated( true );
        JPanel contents = new JPanel();
        contents.setBorder( BorderFactory.createLineBorder(Color.BLACK,1) );
        contents.setLayout(new BorderLayout());
        contents.add(header,       BorderLayout.NORTH);
        contents.add(content_pane, BorderLayout.CENTER);
        contents.setBackground( Color.WHITE );

        setContentPane( contents ); // , BorderLayout.CENTER );
        setLocation(100,100);
    }

    private JButton create_close_button()
    {
        URL image = getClass().getClassLoader().getResource(
                                                "images/8px.red.X.gif");

        JButton b = (image!=null) ? new JButton( new ImageIcon(image) )
                                  : new JButton( "  X  " )
                                  ;

        Border outer = BorderFactory.createLineBorder(CLOSE_BOX_COLOR,1);
        Border inner = BorderFactory.createEmptyBorder(2,2,2,2);

        b.setBorder( BorderFactory.createCompoundBorder(outer,inner) );

        b.setOpaque( false );
        b.addActionListener
        (   new ActionListener()
            {   public void actionPerformed(ActionEvent e)
                {   Popup_dialog.this.setVisible(false);
                    Popup_dialog.this.dispose();
                }
            }
        );

        b.setFocusable( false );
        return b;
    }

    /** Set the dialog title to the indicated text. */
    public void setTitle( String text ){ title.setText( text ); }

    /** Add your widgets to the window returned by this method, in
     *  a manner similar to a JFrame. Do not modify the Popup_dialog
     *  itself. The returned container is a {@link JPanel JPanel}
     *  with a preinstalled {@link BorderLayout}.
     *  By default, it's colored dialog-box gray.
     *  @return the content pane.
     */

private Point reference_position = new Point(0,0);
private MouseMotionListener movement_handler;
private MouseListener click_handler;

private void init_dragable()
{
    movement_handler =
        new MouseMotionAdapter()
        {   public void mouseDragged( MouseEvent e )
            {   // The reference position is the (window-relative)
                // cursor position when the click occurred. The
                // current_mouse_position is mouse position
                // now, and the deltas represent the distance
                // moved.

                Point current_mouse_position  = e.getPoint();
                Point current_window_location = getLocation();

                int delta_x=current_mouse_position.x - reference_position.x;
                int delta_y=current_mouse_position.y - reference_position.y;

                // Move the window over by the computed delta. This move
                // effectively shifts the window-relative, current mouse
                // position back to the original reference position.

                current_window_location.translate(delta_x, delta_y);
                setLocation(current_window_location);
            }
        };

    click_handler =
        new MouseAdapter()
        {   public void mousePressed( MouseEvent e )
            {   reference_position = e.getPoint();  // Start of the drag
            }
        };

    setDragable(true);
}

/** Turn dragability on or off.
*/
public void setDragable( boolean on )
{   if( on )
    {   title.addMouseMotionListener ( movement_handler );
        title.addMouseListener       ( click_handler    );
    }
    else
    {   title.removeMouseMotionListener ( movement_handler );
        title.removeMouseListener       ( click_handler );
    }
}

public class Date_selector_dialog extends Popup_dialog implements Date_selector
{
    private Date_selector selector = new Date_selector_panel();

    /** Creates a dialog box with the indicated parent that holds
     *  a standard {@link Date_selector_panel Date_selector_panel}
     *  (as created using the no-arg constructor).
     */
    public Date_selector_dialog( Frame parent )
    {   super(parent);
        selector = new Navigable_date_selector( new Date_selector_panel() );
        init();
    }

    /* Like {@link #Date_selector_dialog(Frame),
     * but for a {@link Dialog} parent.
     */
    public Date_selector_dialog( Dialog parent )
    {   super(parent);
        selector = new Navigable_date_selector( new Date_selector_panel() );
        init();
    }

    /** Creates a dialog box with the indicated parent that holds
     *  the indicated Date_selector.
     *  Note that the current month and year display in the
     *  dialog-box title bar, so there's no need to display them in
     *  the selector too.
     */
    public Date_selector_dialog( Frame parent, Date_selector to_wrap )
    {   super(parent);
        selector = to_wrap;
        init();
    }

    /* Like {@link #Date_selector_dialog(Frame,Date_selector),
     * but for a {@link Dialog} parent.
     */

    public Date_selector_dialog( Dialog parent, Date_selector to_wrap )
    {   super(parent);
        selector = to_wrap;
        init();
    }

    /** Code common to all constructors.
     */
    private void init()
    {   getContentPane().add( (Container)selector, BorderLayout.CENTER );
        selector.addActionListener
        (   new ActionListener()
            {   public void actionPerformed( ActionEvent event )
                {   if( event.getID() == Date_selector.CHANGE_ACTION )
                    {   setTitle( event.getActionCommand() );
                    }
                    else
                    {   setVisible(false);
                        dispose();
                    }
                }
            }
        );
        ((Container)selector).setVisible(true);
        pack();
    }

    /** For use when you pop up a dialog using
     * setVisible(true) rather than {@link #select}.
     * @return the selected date or null if the dialog was closed
     *          without selecting anything.
     */
    public Date get_selected_date()
    {   return selector.get_selected_date();
    }

    /** Get the current date. The dialog stays in existence
     *  until the user closes it or selects a date, so this
     *  method can be used to see what month the user has
     *  scrolled to.
     *  @return the date currently displayed on the calendar.
     */
    public Date get_current_date()
    {   return selector.get_current_date();
    }

    /** Add an action listener for both.
     *  {@link Date_selector#CHANGE_ACTION} and
     *  {@link Date_selector#SELECT_ACTION} action events.
     */
    public void addActionListener(ActionListener l)
    {   selector.addActionListener(l);
    }

    /** Remove a previously added listener. */
    public void removeActionListener(ActionListener l)
    {   selector.removeActionListener(l);
    }

    /** Pops up the chooser and blocks until the user selects
     *  a date.
     * @return the selected date or null if the dialog was closed
     *          without selecting anything.
     */
    public Date select()
    {
        setVisible(true);
        return selector.get_selected_date();
    }

    public void roll(int f, boolean up) {        selector.roll(f,up);       }
    public int  get(int f)              { return selector.get(f);           }
}

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