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Boris
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Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer1-0/ImageViewer.java Executable file
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import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import javax.swing.*;
import java.io.File;
/**
* ImageViewer is the main class of the image viewer application. It builds and
* displays the application GUI and initialises all other components.
*
* To start the application, create an object of this class.
*
* @author Michael Kölling and David J. Barnes.
* @version 1.0
*/
public class ImageViewer
{
// static fields:
private static final String VERSION = "Version 1.0";
private static JFileChooser fileChooser = new JFileChooser(System.getProperty("user.dir"));
// fields:
private JFrame frame;
private ImagePanel imagePanel;
private JLabel filenameLabel;
private JLabel statusLabel;
private OFImage currentImage;
/**
* Create an ImageViewer show it on screen.
*/
public ImageViewer()
{
currentImage = null;
makeFrame();
}
// ---- implementation of menu functions ----
/**
* Open function: open a file chooser to select a new image file.
*/
private void openFile()
{
int returnVal = fileChooser.showOpenDialog(frame);
if(returnVal != JFileChooser.APPROVE_OPTION) {
return; // cancelled
}
File selectedFile = fileChooser.getSelectedFile();
currentImage = ImageFileManager.loadImage(selectedFile);
if(currentImage == null) { // image file was not a valid image
JOptionPane.showMessageDialog(frame,
"The file was not in a recognized image file format.",
"Image Load Error",
JOptionPane.ERROR_MESSAGE);
return;
}
imagePanel.setImage(currentImage);
showFilename(selectedFile.getPath());
showStatus("File loaded.");
frame.pack();
}
/**
* Close function: close the current image.
*/
private void close()
{
currentImage = null;
imagePanel.clearImage();
showFilename(null);
}
/**
* Quit function: quit the application.
*/
private void quit()
{
System.exit(0);
}
/**
* 'Darker' function: make the picture darker.
*/
private void makeDarker()
{
if(currentImage != null) {
currentImage.darker();
frame.repaint();
showStatus("Applied: darker");
}
else {
showStatus("No image loaded.");
}
}
/**
* 'Lighter' function: make the picture lighter
*/
private void makeLighter()
{
if(currentImage != null) {
currentImage.lighter();
frame.repaint();
showStatus("Applied: lighter");
}
else {
showStatus("No image loaded.");
}
}
/**
* 'threshold' function: apply the threshold filter
*/
private void threshold()
{
if(currentImage != null) {
currentImage.threshold();
frame.repaint();
showStatus("Applied: threshold");
}
else {
showStatus("No image loaded.");
}
}
/**
* Show the 'About...' dialog.
*/
private void showAbout()
{
JOptionPane.showMessageDialog(frame,
"ImageViewer\n" + VERSION,
"About ImageViewer",
JOptionPane.INFORMATION_MESSAGE);
}
// ---- support methods ----
/**
* Display a file name on the appropriate label.
* @param filename The file name to be displayed.
*/
private void showFilename(String filename)
{
if(filename == null) {
filenameLabel.setText("No file displayed.");
}
else {
filenameLabel.setText("File: " + filename);
}
}
/**
* Display a status message in the frame's status bar.
* @param text The status message to be displayed.
*/
private void showStatus(String text)
{
statusLabel.setText(text);
}
// ---- swing stuff to build the frame and all its components ----
/**
* Create the Swing frame and its content.
*/
private void makeFrame()
{
frame = new JFrame("ImageViewer");
makeMenuBar(frame);
Container contentPane = frame.getContentPane();
// Specify the layout manager with nice spacing
contentPane.setLayout(new BorderLayout(6, 6));
filenameLabel = new JLabel();
contentPane.add(filenameLabel, BorderLayout.NORTH);
imagePanel = new ImagePanel();
contentPane.add(imagePanel, BorderLayout.CENTER);
statusLabel = new JLabel(VERSION);
contentPane.add(statusLabel, BorderLayout.SOUTH);
// building is done - arrange the components and show
showFilename(null);
frame.pack();
Dimension d = Toolkit.getDefaultToolkit().getScreenSize();
frame.setLocation(d.width/2 - frame.getWidth()/2, d.height/2 - frame.getHeight()/2);
frame.setVisible(true);
}
/**
* Create the main frame's menu bar.
* @param frame The frame that the menu bar should be added to.
*/
private void makeMenuBar(JFrame frame)
{
final int SHORTCUT_MASK =
Toolkit.getDefaultToolkit().getMenuShortcutKeyMask();
JMenuBar menubar = new JMenuBar();
frame.setJMenuBar(menubar);
JMenu menu;
JMenuItem item;
// create the File menu
menu = new JMenu("File");
menubar.add(menu);
item = new JMenuItem("Open");
item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, SHORTCUT_MASK));
item.addActionListener(e -> openFile());
menu.add(item);
item = new JMenuItem("Close");
item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W, SHORTCUT_MASK));
item.addActionListener(e -> close());
menu.add(item);
menu.addSeparator();
item = new JMenuItem("Quit");
item.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, SHORTCUT_MASK));
item.addActionListener(e -> quit());
menu.add(item);
// create the Filter menu
menu = new JMenu("Filter");
menubar.add(menu);
item = new JMenuItem("Darker");
item.addActionListener(e -> makeDarker());
menu.add(item);
item = new JMenuItem("Lighter");
item.addActionListener(e -> makeLighter());
menu.add(item);
item = new JMenuItem("Threshold");
item.addActionListener(e -> threshold());
menu.add(item);
// create the Help menu
menu = new JMenu("Help");
menubar.add(menu);
item = new JMenuItem("About ImageViewer...");
item.addActionListener(e -> showAbout());
menu.add(item);
}
}