movieeditor.java

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/* MovieEditor - edits a Movie object for MovieCat
 * Copyright (c) 2001, Bruce E. Wampler
 */

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

public class MovieEditor
    extends	JDialog
    implements	ActionListener
{
    // Implement MovieEditor with Singleton pattern
    private static MovieEditor theMovieEditor = null;
    private Movie editedMovie = null;
    
    protected GridBagLayout gridbag;
    protected GridBagConstraints c;

    private JPanel itemPanel;

    // Various components needed for constructing the view
    // We use private statics of each of these since there will
    // be only one instance of the editor

    private static JLabel lblTitle = new JLabel("Movie Title: ");
    private static JTextField fldTitle = new JTextField(30);
    private static JLabel lblDirector=new JLabel("Director: ");
    private static JTextField fldDirector = new JTextField(30);
    private static JLabel lblYear = new JLabel("Year: ");
    private static JTextField fldYear = new JTextField(6);
    private static JLabel lblRating = new JLabel("Rating: ");
    private static JComboBox fldRating;
    private static JLabel lblGenre = new JLabel("   Genre: ");
    private static JComboBox fldGenre;
    private static JLabel lblFormat = new JLabel("   Format: ");
    private static JComboBox fldFormat;
    private static JLabel lblLabel = new JLabel("   Label: ");
    private static JTextField fldLabel = new JTextField(8);
    private static JLabel lblEvaluation =
                                    new JLabel("My Rating: ");
    private static JComboBox fldEvaluation;
    private static JLabel lblComments = new JLabel("Comments: ");

    private static JTextArea textArea;
    private static JButton bPrevious;
    private static JButton bNext;
    private static JButton bUpdate;
    private static JButton bRevert;

    private Movie movie;	// for a local copy

    protected void setAndAdd(JComponent comp,
    int gx, int gy, int gheight, int gwidth)
    {
	// to simplify laying out the gridbag
	c.anchor = c.WEST;
	c.gridx = gx; c.gridy = gy;
	c.gridheight = gheight; c.gridwidth = gwidth;
	gridbag.setConstraints(comp,c);
	itemPanel.add(comp);
    }

    static public MovieEditor getInstance()
    {
	if (theMovieEditor == null)
	{
	    theMovieEditor = new MovieEditor();
	}
	return theMovieEditor;
    }
    
    public MovieEditor()
    {
	// call JDialog constructor
	super(WmvcApp.getFrame(), "Edit Movie", true);
    }
	
    public void initialize()
    {
	// We will use a GridBag for simple layout of itemView
	itemPanel = new JPanel();	// surrounding Panel

	gridbag = new GridBagLayout();
	c = new GridBagConstraints();
	itemPanel.setLayout(gridbag);

	itemPanel.setBorder(BorderFactory.createEmptyBorder(
	                                          5, 5, 5, 5));

	// Movie Title: ________________________
	setAndAdd(lblTitle, 0, 0, 1, 1);
	setAndAdd(fldTitle, 1, 0, 1, c.REMAINDER);

	// Director: _____________________
	setAndAdd(lblDirector, 0, 1, 1, 1);
	setAndAdd(fldDirector, 1, 1, 1, c.REMAINDER);

	// Year: _______      Genre: _________
	setAndAdd(lblYear,  0, 2, 1, 1);
	setAndAdd(fldYear,  1, 2, 1, 1);
	setAndAdd(lblGenre, 2, 2, 1, c.RELATIVE);
	fldGenre = new JComboBox(MovieGenre.getNames());
	setAndAdd(fldGenre, 3, 2, 1, c.REMAINDER);

	// Rating: _______    Format: __________
	setAndAdd(lblRating,  0, 3, 1, 1);
	fldRating = new JComboBox(MovieRating.getNames());
	setAndAdd(fldRating,  1, 3, 1, 1);
	setAndAdd(lblFormat,  2, 3, 1, c.RELATIVE);
	fldFormat = new JComboBox(MovieFormat.getNames());
	setAndAdd(fldFormat,  3, 3, 1, c.REMAINDER);

	// My Rating: ______   Label: _________
	setAndAdd(lblEvaluation,  0, 4, 1, 1);
	fldEvaluation = new JComboBox(
				MovieEvaluation.getNames());
	setAndAdd(fldEvaluation,  1, 4, 1, 1);
	setAndAdd(lblLabel,     2, 4, 1, c.RELATIVE);
	setAndAdd(fldLabel,     3, 4, 1, c.REMAINDER);

	// Comment box:
	setAndAdd(lblComments,  0,5,1,1);
	textArea = new JTextArea(4,30);
	JScrollPane textScroll = new JScrollPane(textArea);
	setAndAdd(textScroll,  1,5,4,c.REMAINDER);

	// Command Buttons

	bRevert =   new JButton(" Cancel ");
	bRevert.setActionCommand("revert");
	bRevert.addActionListener(this);
	setAndAdd(bRevert, 2,9,1,1);

	bUpdate =   new JButton("   OK   ");
	bUpdate.setActionCommand("update");
	bUpdate.addActionListener(this);
	setAndAdd(bUpdate, 3,9,1,1);

	Container contentPane = getContentPane();
	contentPane.add(itemPanel,BorderLayout.CENTER);
	pack();
    }
    
    public Movie showDialog(Component comp, Movie m)
    {
	if (theMovieEditor == null || m == null)
	    return null;
	editedMovie = null;

	movie = (Movie)m.clone();// make a copy to work with
	
	// Set box to current fields
	fldTitle.setText(movie.getTitle());
	fldDirector.setText(movie.getDirector());
	fldYear.setText(movie.getYear());
	fldLabel.setText(movie.getLabel());
	fldRating.setSelectedIndex(movie.getRating());
	fldGenre.setSelectedIndex(movie.getGenre());
	fldFormat.setSelectedIndex(movie.getFormat());
	fldEvaluation.setSelectedIndex(movie.getEvaluation());
	textArea.setText(movie.getComments());

	setLocationRelativeTo(comp);
	setVisible(true);
	
	// will now wait here until actionPerformed
	// calls setVisible(false)
	
	return editedMovie;
    }

    // Implement ActionListener
    public void actionPerformed(ActionEvent e)
    {
	if (e.getActionCommand().equals("update"))
	{
	    movie.setTitle(fldTitle.getText());
	    movie.setDirector(fldDirector.getText());
	    movie.setYear(fldYear.getText());
	    movie.setLabel(fldLabel.getText());
	    movie.setRating(fldRating.getSelectedIndex());
	    movie.setGenre(fldGenre.getSelectedIndex());
	    movie.setFormat(fldFormat.getSelectedIndex());
	    movie.setEvaluation(
	                      fldEvaluation.getSelectedIndex());
	    movie.setComments(textArea.getText());
	    editedMovie = movie;
	    setVisible(false);
	}
	else if (e.getActionCommand().equals("revert"))
	{
	    editedMovie = null;
	    setVisible(false);
	}
    }
}