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Unicode - show a page of Unicode characters
import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Frame;
import java.awt.GraphicsEnvironment;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Menu;
import java.awt.MenuBar;
import java.awt.MenuItem;
import java.awt.MenuShortcut;
import java.awt.Panel;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.DecimalFormat;
import java.util.MissingResourceException;
import java.util.ResourceBundle;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
/**
* Unicode - show a page of Unicode characters. BUG: Times throws a bunch of
* exceptions on page 2 and 3, that can not be caught as they occur in the AWT
* thread. On some platforms.
*
* TODO - remove GoToPage as a dialog, move its textfield into main GUI.
*
* @author Ian Darwin, http://www.darwinsys.com/
* @version $Id: Unicode.java,v 1.7 2004/02/09 03:33:50 ian Exp $
*/
public class Unicode extends JFrame {
/** "main program" method - construct and show */
public static void main(String[] av) {
// create a Unicode object, tell it to show up
new Unicode().setVisible(true);
}
protected final int COLUMNS = 16, ROWS = 16;
/** the unicode char at start of current page */
protected int startNum = 0;
protected final int QUADSIZE = ROWS * COLUMNS;
/** the buttons that display the characters */
protected JLabel buttons[][] = new JLabel[COLUMNS][ROWS];
/** the font name display */
protected JLabel fontName;
/** the row labels, in a column at the left */
protected JLabel rowLabs[] = new JLabel[ROWS];
/** The page chooser pop-up */
protected GoToPage gotoPageUI;
/** How git to make the font samples */
protected final int FONTSIZE = 8;
/** Construct the object including its GUI */
public Unicode() {
super("Unicode");
Container cp = getContentPane();
// Used both for Buttons and Menus
ResourceBundle b = ResourceBundle.getBundle("UnicodeWidgets");
JButton quitButton, nextButton, prevButton;
Panel p = new Panel();
// Make a grid, add one for labels.
p.setLayout(new GridLayout(ROWS + 1, COLUMNS + 1));
DecimalFormat df2d = new DecimalFormat("00");
// Add first row, just column labels.
p.add(new JLabel(""));
for (int i = 0; i < COLUMNS; i++)
p.add(new JLabel(Integer.toString(i, 16), JLabel.CENTER));
// Add subsequent rows, each with an offset label
for (int i = 0; i < ROWS; i++) {
JLabel l = new JLabel("0000"); // room for max, i.e. uFFFF
p.add(l);
rowLabs[i] = l;
for (int j = 0; j < COLUMNS; j++) {
JLabel pb = new JLabel(" ");
buttons[j][i] = pb;
p.add(pb);
}
}
// ActionListeners for jumping around; used by buttons and menus
ActionListener firster = new ActionListener() {
public void actionPerformed(ActionEvent e) {
gotoPage(startNum = 0);
}
};
ActionListener previouser = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (startNum > 0)
gotoPage(startNum -= QUADSIZE);
}
};
ActionListener nexter = new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (startNum < 65535)
gotoPage(startNum += QUADSIZE);
}
};
ActionListener laster = new ActionListener() {
public void actionPerformed(ActionEvent e) {
gotoPage(65536 - QUADSIZE);
}
};
cp.add(BorderLayout.NORTH, p);
fontName = new JLabel("Default font", JLabel.CENTER);
cp.add(BorderLayout.CENTER, fontName);
Panel q = new Panel();
cp.add(BorderLayout.SOUTH, q);
q.add(prevButton = mkButton(b, "page.prev"));
prevButton.addActionListener(previouser);
q.add(nextButton = mkButton(b, "page.next"));
nextButton.addActionListener(nexter);
q.add(quitButton = mkButton(b, "exit"));
quitButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
dispose();
System.exit(0);
}
});
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
setVisible(false);
dispose();
System.exit(0);
}
});
MenuItem mi; // used in various spots
MenuBar mb = new MenuBar();
setMenuBar(mb);
String titlebar;
try {
titlebar = b.getString("program" + ".title");
} catch (MissingResourceException e) {
titlebar = "Unicode Demo";
}
setTitle(titlebar);
ActionListener fontSelector = new ActionListener() {
public void actionPerformed(ActionEvent e) {
String font = e.getActionCommand();
mySetFont(font, FONTSIZE);
}
};
Menu fontMenu = mkMenu(b, "font");
// String[] fontList = Toolkit.getDefaultToolkit().getFontList();
String[] fontList = GraphicsEnvironment.getLocalGraphicsEnvironment()
.getAvailableFontFamilyNames();
for (int i = 0; i < fontList.length; i++) {
fontMenu.add(mi = new MenuItem(fontList[i]));
mi.addActionListener(fontSelector);
}
mb.add(fontMenu);
gotoPageUI = new GoToPage("Unicode Page");
centre(gotoPageUI);
Menu vm = mkMenu(b, "page");
vm.add(mi = mkMenuItem(b, "page", "first"));
mi.addActionListener(firster);
vm.add(mi = mkMenuItem(b, "page", "prev"));
mi.addActionListener(previouser);
vm.add(mi = mkMenuItem(b, "page", "next"));
mi.addActionListener(nexter);
vm.add(mi = mkMenuItem(b, "page", "last"));
mi.addActionListener(laster);
vm.add(mi = mkMenuItem(b, "page", "goto"));
mi.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Unicode.this.gotoPageUI.setVisible(true);
}
});
mb.add(vm);
Menu hm = mkMenu(b, "help");
hm.add(mi = mkMenuItem(b, "help", "about"));
mb.setHelpMenu(hm); // needed for portability (Motif, etc.).
pack();
// After packing the Frame, centre it on the screen.
centre(this);
// start at a known place
mySetFont(fontList[0], FONTSIZE);
gotoPage(startNum);
} // End of huge Constructor
private void mySetFont(String font, int sz) {
fontName.setText("Font = " + font);
Font f = new Font(font, Font.PLAIN, sz);
for (int i = 0; i < ROWS; i++) {
for (int j = 0; j < COLUMNS; j++)
buttons[i][j].setFont(f);
}
repaint();
}
public void centre(Window c) {
Dimension us = c.getSize(), them = Toolkit.getDefaultToolkit()
.getScreenSize();
int newX = (them.width - us.width) / 2;
int newY = (them.height - us.height) / 2;
c.setLocation(newX, newY);
}
/**
* Go to a given page of Unicode. At present the parameter is a code value,
* but it should be a page #.
*/
private void gotoPage(int startNum) {
// System.out.println("startAt(" + startNum + ")");
char chars[] = new char[1];
for (int i = 0; i < ROWS; i++) {
JLabel l = rowLabs[i];
// System.out.println("i=" + i + ", JLabel=" + l);
l.setText(Integer.toString(startNum + (i * COLUMNS), 16));
// l.validate(); // size may be too big now
for (int j = 0; j < COLUMNS; j++) {
chars[0] = (char) (startNum + ((j * ROWS) + i));
JLabel b = buttons[i][j];
b.setText(new String(chars));
}
}
repaint();
}
/** Convenience routine to make a Button */
public JButton mkButton(ResourceBundle b, String name) {
String label;
try {
label = b.getString(name + ".label");
} catch (MissingResourceException e) {
label = name;
}
return new JButton(label);
}
/** Convenience routine to make a Menu */
public Menu mkMenu(ResourceBundle b, String name) {
String menuLabel;
try {
menuLabel = b.getString(name + ".label");
} catch (MissingResourceException e) {
menuLabel = name;
}
return new Menu(menuLabel);
}
/** Convenience routine to make a MenuItem */
public MenuItem mkMenuItem(ResourceBundle b, String menu, String name) {
String miLabel;
try {
miLabel = b.getString(menu + "." + name + ".label");
} catch (MissingResourceException e) {
miLabel = name;
}
String key = null;
try {
key = b.getString(menu + "." + name + ".key");
} catch (MissingResourceException e) {
key = null;
}
if (key == null)
return new MenuItem(miLabel);
else
return new MenuItem(miLabel, new MenuShortcut(key.charAt(0)));
}
/**
* Implement a simple "Go To Page" dialog Row one: "Go to Page", textfield
* second OK, Cancel buttons.
*/
class GoToPage extends Frame {
/** TextField used to enter the number */
protected JTextField tf;
/** The OK button */
protected Button ok;
/** The cancel button */
protected Button can;
/** Construct a GoToPage window (no actions yet) */
public GoToPage(String title) {
setTitle(title);
Container cp = getContentPane();
Label l = new Label("Quadrant number (hex):");
tf = new JTextField(4);
tf.setText("1");
// set the text initially selected so you can easily overtype it
tf.selectAll();
ok = new Button("OK");
can = new Button("Cancel");
can.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
setVisible(false);
}
});
ActionListener doIt = new ActionListener() {
public void actionPerformed(ActionEvent e) {
int n = -1;
try {
n = getValue();
} catch (IllegalArgumentException notANumber) {
// handled below
}
if (n >= 0 && n <= 255) {
gotoPage(startNum = n * QUADSIZE);
setVisible(false);
} else
Toolkit.getDefaultToolkit().beep();
}
};
ok.addActionListener(doIt);
tf.addActionListener(doIt);
Panel top = new Panel();
top.add(l);
top.add(tf);
Panel bottom = new Panel();
bottom.add(ok);
bottom.add(can);
cp.add(BorderLayout.NORTH, top);
cp.add(BorderLayout.SOUTH, bottom);
pack();
}
protected int getValue() {
int i = Integer.parseInt(tf.getText(), 16);
return i;
}
}
}
//UnicodeWidgets.properties
/*
program.title=Unicode lister, by Ian Darwin
#
# The Exit button
exit.label=Close
#
# The Font Family Menu
#
font.label=Font Family
# font names, hence menuitems, are discovered from Toolkit by the program
#
# The Page Menu
#
page.label=Page
page.first.label=Quadrant 0 (ASCII)
page.first.key=F
page.prev.label=Previous Quadrant
page.prev.key=P
page.next.label=Next Quadrant
page.next.key=N
page.last.label=Last Quadrant
page.last.key=L
page.goto.label=Goto Page...
page.goto.key=G
#
# The Help Menu
#
help.label=Help
help.about.label=About
*/
