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Semester 1/Programming 1/Java/examples/projects/chapter13/imageviewer0-4/ImageViewer.java

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+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+/**
+ * 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 0.4
+ */
+public class ImageViewer
+{
+    private JFrame frame;
+    private ImagePanel imagePanel;
+    
+    /**
+     * Create an ImageViewer show it on screen.
+     */
+    public ImageViewer()
+    {
+        makeFrame();
+    }
+
+
+    // ---- implementation of menu functions ----
+    
+    /**
+     * Open function: open a file chooser to select a new image file.
+     */
+    private void openFile()
+    {
+        OFImage image = ImageFileManager.getImage();
+        imagePanel.setImage(image);
+        frame.pack();
+    }
+    
+    /**
+     * Quit function: quit the application.
+     */
+    private void quit()
+    {
+        System.exit(0);
+    }
+    
+    // ---- 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();
+        
+        imagePanel = new ImagePanel();
+        contentPane.add(imagePanel);
+
+        // building is done - arrange the components and show        
+        frame.pack();
+        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);
+        
+        // create the File manu
+        JMenu fileMenu = new JMenu("File");
+        menubar.add(fileMenu);
+        
+        JMenuItem openItem = new JMenuItem("Open");
+            openItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_O, SHORTCUT_MASK));
+            openItem.addActionListener(e -> openFile());
+        fileMenu.add(openItem);
+
+        JMenuItem quitItem = new JMenuItem("Quit");
+            quitItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_Q, SHORTCUT_MASK));
+            quitItem.addActionListener(e -> quit());
+        fileMenu.add(quitItem);
+
+    }
+}