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Scrolling Image Viewer

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Submitted on: 6/20/2017 9:10:23 PM
By: Leo 
Level: Intermediate
User Rating: Unrated
Compatibility: Java (JDK 1.2), Java (JDK 1.3), Java (JDK 1.4), Java (JDK 1.5)
Views: 699
 
     Basic scroll image viewer. Adding filter (select images files only).
 
code:
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//**************************************
// Name: Scrolling Image Viewer
// Description:Basic scroll image viewer.
Adding filter (select images files only).
// By: Leo
//**************************************

import java.lang.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.Dimension;
import javax.swing.*;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;
import java.io.*;
import java.io.File;
public class TutorialImageViewer extends JFrame {
	
	public TutorialImageViewer() {
		this.setDefaultCloseOperation(EXIT_ON_CLOSE);
		this.setTitle("Image Viewer");
		this.setSize(240, 100);
		JButton openButton = new JButton("Open Image");
		this.getContentPane().add(openButton);
		openButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent ae) {
				JFileChooser chooser = new JFileChooser(".");
				FileFilter ff = new ExtensionFileFilter("Images Files", 
					new String[] {"jpg", "png", "gif"});
				chooser.setFileFilter(ff);
				int status = chooser.showOpenDialog(TutorialImageViewer.this);
				if (status == JFileChooser.APPROVE_OPTION) {
					try {
						JFrame frame = new JFrame();
						JLabel label = new JLabel();
						JScrollPane sp = new JScrollPane(label);
						sp.setPreferredSize(new Dimension(560, 480));
						ImageIcon icon = new ImageIcon(chooser.getSelectedFile().toURL());
						label.setIcon(icon);
						frame.add(sp, BorderLayout.CENTER);
						frame.pack();
						String imgpath = chooser.getSelectedFile().toString();
						frame.setTitle(imgpath);
						frame.setVisible(true);
					} catch (Exception e) {
						System.err.println("Error: " + e); 
					}
				}
				repaint();
			}
		});
	}
	
	public static void main(String[] args) {
		TutorialImageViewer tim = new TutorialImageViewer();
		tim.setVisible(true);
	}
}
class ExtensionFileFilter extends FileFilter {
 String description;
 String extensions[];
 public ExtensionFileFilter(String description, String extension) {
this(description, new String[] { extension });
 }
 public ExtensionFileFilter(String description, String extensions[]) {
if (description == null) {
 this.description = extensions[0];
} else {
 this.description = description;
}
this.extensions = (String[]) extensions.clone();
toLower(this.extensions);
 }
 private void toLower(String array[]) {
for (int i = 0, n = array.length; i < n; i++) {
 array[i] = array[i].toLowerCase();
}
 }
 public String getDescription() {
return description;
 }
 public boolean accept(File file) {
if (file.isDirectory()) {
 return true;
} else {
 String path = file.getAbsolutePath().toLowerCase();
 for (int i = 0, n = extensions.length; i < n; i++) {
String extension = extensions[i];
if ((path.endsWith(extension) && 
(path.charAt(path.length() - extension.length() - 1)) == '.')) {
 return true;
}
 }
}
return false;
 }
}


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