FileDocCategorySizeDatePackage
UnicodeDisplay.javaAPI DocExample6348Mon Sep 22 13:30:32 BST 1997None

UnicodeDisplay

public class UnicodeDisplay extends Frame implements ActionListener
This program displays Unicode glyphs using user-specified fonts and font styles.

Fields Summary
int
page
UnicodePanel
p
Scrollbar
b
String
fontfamily
int
fontstyle
Constructors Summary
public UnicodeDisplay(String name)
This constructor creates the frame, menubar, and scrollbar that work along with the UnicodePanel class, defined below


                       
     
    super(name);
    this.setLayout(new BorderLayout());
    p = new UnicodePanel();                // Create the panel
    p.setBase((char)(page * 0x100));       // Initialize it
    this.add(p, "Center");                 // Center it

    // Create and set up a scrollbar, and put it on the right
    b = new Scrollbar(Scrollbar.VERTICAL, 0, 1, 0, 0xFF);
    b.setUnitIncrement(1);
    b.setBlockIncrement(0x10);
    b.addAdjustmentListener(new AdjustmentListener() {
      public void adjustmentValueChanged(AdjustmentEvent e) {
        page = e.getValue();
        p.setBase((char)(page * 0x100));
      }
    });
    this.add(b, "East");

    // Set things up so we respond to window close requests
    this.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        UnicodeDisplay.this.dispose();
        System.exit(0);
      }
    });

    // Handle Page Up and Page Down and the up and down arrow keys
    this.addKeyListener(new KeyAdapter() {
      public void keyPressed(KeyEvent e) {
        int code = e.getKeyCode();
        int oldpage = page;
        if ((code == KeyEvent.VK_PAGE_UP) || (code == KeyEvent.VK_UP)) {
          if (e.isShiftDown()) page -= 0x10;
          else page -= 1;
          if (page < 0) page = 0;
        }
        else if ((code == KeyEvent.VK_PAGE_DOWN) || (code==KeyEvent.VK_DOWN)) {
          if (e.isShiftDown()) page += 0x10;
          else page += 1;
          if (page > 0xff) page = 0xff;
        }
        if (page != oldpage) {              // if anything has changed...
          p.setBase((char) (page * 0x100)); // update the display
          b.setValue(page);                 // and update scrollbar to match
        }
      }
    });

    // Set up a menu system to change fonts.  Use a convenience method.
    MenuBar menubar = new MenuBar();
    this.setMenuBar(menubar);
    menubar.add(makemenu("Font Family", 
                         new String[] {"Serif", "SansSerif", "Monospaced"},
                         this));
    menubar.add(makemenu("Font Style", 
                         new String[]{"Plain", "Italic", "Bold", "BoldItalic"},
                         this));
Methods Summary
public voidactionPerformed(java.awt.event.ActionEvent e)
This method handles the items in the menubars

    String cmd = e.getActionCommand();
    if (cmd.equals("Serif")) fontfamily = "Serif";
    else if (cmd.equals("SansSerif")) fontfamily = "SansSerif";
    else if (cmd.equals("Monospaced")) fontfamily = "Monospaced";
    else if (cmd.equals("Plain")) fontstyle = Font.PLAIN;
    else if (cmd.equals("Italic")) fontstyle = Font.ITALIC;
    else if (cmd.equals("Bold")) fontstyle = Font.BOLD;
    else if (cmd.equals("BoldItalic")) fontstyle = Font.BOLD + Font.ITALIC;
    p.setFont(fontfamily, fontstyle);
public static voidmain(java.lang.String[] args)
The main() program just create a window, packs it, and shows it

    UnicodeDisplay f = new UnicodeDisplay("Unicode Displayer");
    f.pack();
    f.show();
private java.awt.Menumakemenu(java.lang.String name, java.lang.String[] itemnames, java.awt.event.ActionListener listener)
A convenience method to create a Menu from an array of items

    Menu m = new Menu(name);
    for(int i = 0; i < itemnames.length; i++) {
      MenuItem item = new MenuItem(itemnames[i]);
      item.addActionListener(listener);
      item.setActionCommand(itemnames[i]);  // okay here, though
      m.add(item);
    }
    return m;