import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; /* * ScrollDemo.java is a 1.4 application that requires these files: * Rule.java * Corner.java * ScrollablePicture.java * images/youngdad.jpeg */ public class ScrollDemo extends JPanel implements ItemListener { private Rule columnView; private Rule rowView; private JToggleButton isMetric; private ScrollablePicture picture; public ScrollDemo() { setLayout(new BoxLayout(this, BoxLayout.LINE_AXIS)); //Get the image to use. ImageIcon david = createImageIcon("images/youngdad.jpeg"); //Create the row and column headers. columnView = new Rule(Rule.HORIZONTAL, true); rowView = new Rule(Rule.VERTICAL, true); if (david != null) { columnView.setPreferredWidth(david.getIconWidth()); rowView.setPreferredHeight(david.getIconHeight()); } else { columnView.setPreferredWidth(320); rowView.setPreferredHeight(480); } //Create the corners. JPanel buttonCorner = new JPanel(); //use FlowLayout isMetric = new JToggleButton("cm", true); isMetric.setFont(new Font("SansSerif", Font.PLAIN, 11)); isMetric.setMargin(new Insets(2,2,2,2)); isMetric.addItemListener(this); buttonCorner.add(isMetric); //Set up the scroll pane. picture = new ScrollablePicture(david, columnView.getIncrement()); JScrollPane pictureScrollPane = new JScrollPane(picture); pictureScrollPane.setPreferredSize(new Dimension(300, 250)); pictureScrollPane.setViewportBorder( BorderFactory.createLineBorder(Color.black)); pictureScrollPane.setColumnHeaderView(columnView); pictureScrollPane.setRowHeaderView(rowView); //Set the corners. //In theory, to support internationalization you would change //UPPER_LEFT_CORNER to UPPER_LEADING_CORNER, //LOWER_LEFT_CORNER to LOWER_LEADING_CORNER, and //UPPER_RIGHT_CORNER to UPPER_TRAILING_CORNER. In practice, //bug #4467063 makes that impossible (in 1.4, at least). pictureScrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, buttonCorner); pictureScrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER, new Corner()); pictureScrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, new Corner()); //Put it in this panel. add(pictureScrollPane); setBorder(BorderFactory.createEmptyBorder(20,20,20,20)); } public void itemStateChanged(ItemEvent e) { if (e.getStateChange() == ItemEvent.SELECTED) { //Turn it to metric. rowView.setIsMetric(true); columnView.setIsMetric(true); } else { //Turn it to inches. rowView.setIsMetric(false); columnView.setIsMetric(false); } picture.setMaxUnitIncrement(rowView.getIncrement()); } /** Returns an ImageIcon, or null if the path was invalid. */ protected static ImageIcon createImageIcon(String path) { java.net.URL imgURL = ScrollDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL); } else { System.err.println("Couldn't find file: " + path); return null; } } /** * Create the GUI and show it. For thread safety, * this method should be invoked from the * event-dispatching thread. */ private static void createAndShowGUI() { //Make sure we have nice window decorations. JFrame.setDefaultLookAndFeelDecorated(true); //Create and set up the window. JFrame frame = new JFrame("ScrollDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. JComponent newContentPane = new ScrollDemo(); newContentPane.setOpaque(true); //content panes must be opaque frame.setContentPane(newContentPane); //Display the window. frame.pack(); frame.setVisible(true); } public static void main(String[] args) { //Schedule a job for the event-dispatching thread: //creating and showing this application's GUI. javax.swing.SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } }