Source Code : A program for viewing images

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A program for viewing images

   


/*
 This program is a part of the companion code for Core Java 8th ed.
 (http://horstmann.com/corejava)

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;

import javax.swing.ImageIcon;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

/**
 * A program for viewing images.
 * 
 * @version 1.22 2007-05-21
 * @author Cay Horstmann
 */
public class ImageViewer {
  public static void main(String[] args) {
    EventQueue.invokeLater(new Runnable() {
      public void run() {
        JFrame frame = new ImageViewerFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
      }
    });
  }
}

/**
 * A frame with a label to show an image.
 */
class ImageViewerFrame extends JFrame {
  public ImageViewerFrame() {
    setTitle("ImageViewer");
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

    // use a label to display the images
    label = new JLabel();
    add(label);

    // set up the file chooser
    chooser = new JFileChooser();
    chooser.setCurrentDirectory(new File("."));

    // set up the menu bar
    JMenuBar menuBar = new JMenuBar();
    setJMenuBar(menuBar);

    JMenu menu = new JMenu("File");
    menuBar.add(menu);

    JMenuItem openItem = new JMenuItem("Open");
    menu.add(openItem);
    openItem.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        // show file chooser dialog
        int result = chooser.showOpenDialog(null);

        // if file selected, set it as icon of the label
        if (result == JFileChooser.APPROVE_OPTION) {
          String name = chooser.getSelectedFile().getPath();
          label.setIcon(new ImageIcon(name));
        }
      }
    });

    JMenuItem exitItem = new JMenuItem("Exit");
    menu.add(exitItem);
    exitItem.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        System.exit(0);
      }
    });
  }

  private JLabel label;

  private JFileChooser chooser;

  private static final int DEFAULT_WIDTH = 300;

  private static final int DEFAULT_HEIGHT = 400;
}

   
    
    
  

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