import java.awt.*; import java.awt.event.*; import javax.swing.*; import javax.swing.border.*; /* * AccessibleScrollDemo requires these files: * Rule.java * Corner.java * ScrollablePicture.java * images/youngdad.jpeg */ public class AccessibleScrollDemo extends JPanel implements ItemListener { private Rule columnView; private Rule rowView; private JToggleButton isMetric; private ScrollablePicture picture; public AccessibleScrollDemo() { // Get the image to use. ImageIcon david = createImageIcon("images/youngdad.jpeg", "Photograph of David McNabb in his youth."); // Create the row and column headers. columnView = new Rule(Rule.HORIZONTAL, true); if (david != null) { columnView.setPreferredWidth(david.getIconWidth()); } else { columnView.setPreferredWidth(320); } columnView.getAccessibleContext().setAccessibleName("Column Header"); columnView.getAccessibleContext(). setAccessibleDescription("Displays horizontal ruler for " + "measuring scroll pane client."); rowView = new Rule(Rule.VERTICAL, true); if (david != null) { rowView.setPreferredHeight(david.getIconHeight()); } else { rowView.setPreferredHeight(480); } rowView.getAccessibleContext().setAccessibleName("Row Header"); rowView.getAccessibleContext(). setAccessibleDescription("Displays vertical ruler for " + "measuring scroll pane client."); // Create the corners. JPanel buttonCorner = new JPanel(); isMetric = new JToggleButton("cm", true); isMetric.setFont(new Font("SansSerif", Font.PLAIN, 11)); isMetric.setMargin(new Insets(2,2,2,2)); isMetric.addItemListener(this); isMetric.setToolTipText("Toggles rulers' unit of measure " + "between inches and centimeters."); buttonCorner.add(isMetric); //Use the default FlowLayout buttonCorner.getAccessibleContext(). setAccessibleName("Upper Left Corner"); String desc = "Fills the corner of a scroll pane " + "with color for aesthetic reasons."; Corner lowerLeft = new Corner(); lowerLeft.getAccessibleContext(). setAccessibleName("Lower Left Corner"); lowerLeft.getAccessibleContext().setAccessibleDescription(desc); Corner upperRight = new Corner(); upperRight.getAccessibleContext(). setAccessibleName("Upper Right Corner"); upperRight.getAccessibleContext().setAccessibleDescription(desc); // Set up the scroll pane. picture = new ScrollablePicture(david, columnView.getIncrement()); picture.setToolTipText(david.getDescription()); picture.getAccessibleContext().setAccessibleName( "Scroll pane client"); JScrollPane pictureScrollPane = new JScrollPane(picture); pictureScrollPane.setPreferredSize(new Dimension(300, 250)); pictureScrollPane.setViewportBorder( BorderFactory.createLineBorder(Color.black)); pictureScrollPane.setColumnHeaderView(columnView); pictureScrollPane.setRowHeaderView(rowView); // 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 (at least in 1.4.0). pictureScrollPane.setCorner(JScrollPane.UPPER_LEFT_CORNER, buttonCorner); pictureScrollPane.setCorner(JScrollPane.LOWER_LEFT_CORNER, lowerLeft); pictureScrollPane.setCorner(JScrollPane.UPPER_RIGHT_CORNER, upperRight); // Put it in this panel. setLayout(new BoxLayout(this, BoxLayout.X_AXIS)); 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, String description) { java.net.URL imgURL = AccessibleScrollDemo.class.getResource(path); if (imgURL != null) { return new ImageIcon(imgURL, description); } 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() { //Create and set up the window. JFrame frame = new JFrame("AccessibleScrollDemo"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //Create and set up the content pane. JComponent newContentPane = new AccessibleScrollDemo(); 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(); } }); } }