Hi guys.
I decided to post this simple Photo viewer application.
Its strictly for beginners, and cab be improved.
/**
*
* @author Neon Tetras
*/
import java.awt.Image;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
public class ImageViewer extends javax.swing.JFrame {
/**
* Class constructor: ImageViewer
*/
public ImageViewer() {
initComponents();
listFiles(Path); //Lists all the files in the directory on window opening
setLabelIcon(Path,filenames[position]); //sets the label to display the first
//image in the directory on window opening.
PreviousButton.setEnabled(false);
}
/**
*Initialize components
*/
private void initComponents() {
setTitle("Image Viewer");
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLayout(new java.awt.BorderLayout());// The layout is BorderLayout
//setBorder(javax.swing.BorderFactory.createEtchedBorder());
setBackground(java.awt.Color.GRAY);
picLabel = new javax.swing.JLabel(); //Create the Label to display the picture
picLabel.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
picLabel.setHorizontalTextPosition(javax.swing.SwingConstants.CENTER);
PreviousButton = new javax.swing.JButton();
PreviousButton.setText("Previous");
PreviousButton.setIconTextGap(10); //Distance between the icon and text is 10
PreviousButton.addActionListener(new java.awt.event.ActionListener() { //Register an actionListener for the PreviousButton
public void actionPerformed(java.awt.event.ActionEvent evt) {
PreviousButtonActionPerformed(evt);
}
});
NextButton = new javax.swing.JButton();
NextButton.setPreferredSize(PreviousButton.getPreferredSize());
NextButton.setText("Next");
NextButton.setHorizontalTextPosition(javax.swing.SwingConstants.LEFT);
NextButton.setIconTextGap(10); //Distance between the icon and text is 10
NextButton.addActionListener(new java.awt.event.ActionListener() { //Registers an actionListener for the NextButton
public void actionPerformed(java.awt.event.ActionEvent evt) {
NextButtonActionPerformed(evt);
}
});
javax.swing.Box vbox = javax.swing.Box.createVerticalBox(); //VerticalBox to hold the pictureLabel and the buttons
vbox.add(javax.swing.Box.createVerticalStrut(30));
vbox.add(picLabel);
vbox.add(javax.swing.Box.createVerticalStrut(50));
javax.swing.JPanel prev_next_pane = new javax.swing.JPanel(); //Panel to hold the Previous and Next buttons.
java.awt.FlowLayout flow = new java.awt.FlowLayout(java.awt.FlowLayout.CENTER);
flow.setHgap(30);
prev_next_pane.setLayout(flow);
prev_next_pane.add(PreviousButton);
prev_next_pane.add(NextButton);
prev_next_pane.setOpaque(false);
vbox.add(prev_next_pane); //Add the panel to the verticalBox
add(vbox);
java.awt.Toolkit theKit = getToolkit();
java.awt.Dimension size = theKit.getScreenSize();
setLocation(size.width/5,size.height/10);
setMinimumSize(new java.awt.Dimension(900,600));
//setMaximumSize(new Dimension(size.width/4 + 50,size.height/4));
//pack();
}//END:initComponents
/**
*Handler for previous button
*/
private void PreviousButtonActionPerformed(java.awt.event.ActionEvent evt) {
position--; //Decrement the index position of the array of filenames by one on buttonPressed
if(!NextButton.isEnabled()){ //if NextButton is
NextButton.setEnabled(true); //disabled, enable it
}
if(position == 0){ //If we are viewing the first Picture in
PreviousButton.setEnabled(false); //the directory, disable previous button
}
setLabelIcon(Path,filenames[position]);
}//End of PreviousButton handler
/**
*Handler for NextButton
*/
private void NextButtonActionPerformed(java.awt.event.ActionEvent evt) {
position++; //Increment the index position of array of filenames by one on buttonPressed
if(!PreviousButton.isEnabled()){
listFiles(Path);
PreviousButton.setEnabled(true);
}
if(position == filenames.length){
NextButton.setEnabled(false);
position --;
return;
}
setLabelIcon(Path,filenames[position]);
}//End of NextButton handler
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/*
* Set the Nimbus look and feel
*/
/*
* If Nimbus (introduced in Java SE 6) is not available, stay with the
* default look and feel. For details see
* http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(ImageViewer.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
/*
* Create and display the form
*/
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new ImageViewer().setVisible(true);
}
});
}
/**Method to list all the files in the directory
*And store their names in an array
*/
private void listFiles(String Path){
File file = new File(Path);
filenames = file.list(); //store the file names in the array of strings.
for(String names : filenames){
System.out.println(names); //Print the filenames to the console just so you can see
}
}
//Method to set the picture on the label
private void setLabelIcon(String Path,String name){
File file = new File(Path+"\\"+name);
java.awt.image.BufferedImage image = null;
try{
image = ImageIO.read(file); //Reas the image from the file.
}catch(IOException ie){
javax.swing.JOptionPane.showMessageDialog(this,"Error reading image file","Error",
javax.swing.JOptionPane.ERROR_MESSAGE);
}
ImageIcon icon = new ImageIcon(image);
int width = 600;
int height = 400;
Image img = icon.getImage().getScaledInstance(width,height,java.awt.Image.SCALE_SMOOTH); //Images produced will remain a fixed size, 600 * 400
ImageIcon newIcon = new ImageIcon(img); //Create a new imageicon from an image object.
//Now we want to create a caption for the pictures using their file names
String pictureName = file.getName();
int pos = pictureName.lastIndexOf("."); //This removes the extensions
String caption = pictureName.substring(0,pos); //from the file names. e.g .gif, .jpg, .png
picLabel.setIcon(newIcon); //Set the imageIcon on the Label
picLabel.setText(caption); //Set the caption
picLabel.setVerticalTextPosition(javax.swing.SwingConstants.BOTTOM); //Caption appears below the image
}
//Variables declaration
int position = 0; //Initial position is 0
String[] filenames; //Array to hold the file names
final String Path = System.getProperty("user.home") +"\\User_Name\\pictures\\"; //path to your images
private javax.swing.JButton NextButton;
private javax.swing.JButton PreviousButton;
private javax.swing.JLabel picLabel;
// End of variables declaration//GEN-END:variables
}//End of class
