Re: Display image selected from JFileChooser

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 14 Jun 2010 09:09:57 -0700

Message-ID:

<qvsRn.58268$h57.14701@newsfe22.iad>

On 6/14/2010 1:36 AM, jimmy wrote:

Oops! I'm really not doing well pasting code - I posted two copies of
the same class previously. The missing class is:

import javax.swing.*;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.event.ActionListener;

public class MyImageApp extends Component{

     public static void main(String[] args){

         JFrame myFrame = new JFrame();

         myFrame.setTitle("Here's my Frame");
         myFrame.setSize(200, 200);
         myFrame.setVisible(true);
         myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
         myFrame.pack();

         Action myAction = new MyAction();

         JButton myButton = new JButton(myAction);

         myFrame.add(myButton, BorderLayout.SOUTH);

         MyImage core = new MyImage(myFrame);
         myFrame.add(core, BorderLayout.CENTER);
         core.MyAction();
     }
}

This is too painful to watch anymore.

import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;

public class test extends JPanel {
     private BufferedImage image;

     public test() {
         setPreferredSize(new Dimension(400,300));
     }

     public void setImage(BufferedImage bi) {
         image = bi;
         setPreferredSize(new Dimension(bi.getWidth(),bi.getHeight()));
         revalidate(); // tells the JScrollPane the size has changed
         repaint(); // redraws the new image
     }

     public void paintComponent(Graphics g) {
         super.paintComponent(g);
         g.drawImage(image,0,0,null);
     }

     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 final JFrame f = new JFrame();
                 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                 final test t = new test();
                 final JFileChooser chooser = new JFileChooser();

                 JMenuBar mb = new JMenuBar();
                 f.setJMenuBar(mb);
                 JMenu file = new JMenu("File");
                 mb.add(file);
                 JMenuItem mi = new JMenuItem("Open");
                 file.add(mi);
                 mi.addActionListener(new ActionListener() {
                     public void actionPerformed(ActionEvent ae) {
                         if (chooser.showOpenDialog(f) ==
                          JFileChooser.APPROVE_OPTION) {
                             try {
                                 BufferedImage bi = ImageIO.read(
                                  chooser.getSelectedFile());
                                 if (bi != null)
                                     t.setImage(bi);
                                 else
                                     JOptionPane.showMessageDialog(f,
                                      "File is not an image!");
                             } catch (IOException ioe) {
                                 JOptionPane.showMessageDialog(f,
                                  "Error Reading File!");
                             }
                         }
                     }
                 });

                 f.add(new JScrollPane(t),BorderLayout.CENTER);
                 f.pack();
                 f.setVisible(true);
             }
         });
     }
}

--

Knute Johnson
email s/nospam/knute2010/