Java Reference
In-Depth Information
Example 7−1: UnicodeDisplay.java (continued)
// Create and set up a scrollbar, and put it on the right
b = new JScrollBar(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));
}
});
getContentPane().add(b, "East");
// Set things up so we respond to window close requests
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) { 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.
JMenuBar menubar = new JMenuBar();
this.setJMenuBar(menubar);
menubar.add(makemenu("Font Family",
new String[] {"Serif", "SansSerif", "Monospaced"},
this));
menubar.add(makemenu("Font Style",
new String[]{
"Plain","Italic","Bold","BoldItalic"
}, this));
}
/** This method handles the items in the menubars */
public void actionPerformed(ActionEvent e) {
String cmd = e.getActionCommand();
if (cmd.equals("Serif")) fontfamily = "Serif";
else if (cmd.equals("SansSerif")) fontfamily = "SansSerif";
