masayoshi.okutsu@Eng 1997-01-13
java.awt.Choice cannot display Japanese characters.

The following is the test program. (Choose "Choice").

import java.awt.*;
import java.io.PrintStream;

public class CharViewMultiLine extends java.awt.Frame
{
static String hexConst = "0123456789ABCDEF";
Button bPrev, bNext, bOK;
Choice cFont, cStyle;
byte higher; // 0 to 255
GraphicObjectMultiLine someobj;
Panel someobjHolder;
Panel dataPanel, controlPanel;
TextField n;

String fontNames[] = {
"SansSerif",
"Dialog",
"DialogInput",
"Serif"
};
String styleNames[] = {
"List",
"Choice",
"TextArea"
};
Class styleClass[] = {
TestList.class,
TestChoice.class,
TestTextArea.class
};
Font farray[];
int curfont, curstyle;
final static int fontSize = 16;

public CharViewMultiLine() {
// make frame
super("CharView");

// create fonts
farray = new Font[fontNames.length];
cFont = new Choice();
for(int i = 0; i < fontNames.length; i++) {
farray[i] = new Font(fontNames[i], 0, fontSize);
cFont.addItem(fontNames[i]);
}

// create style list
cStyle = new Choice();
for(int i = 0; i < styleNames.length; i++) {
cStyle.addItem(styleNames[i]);
}

// reset state
higher = 0;
setLayout(new FlowLayout(FlowLayout.CENTER));
controlPanel = new Panel();
controlPanel.setLayout(new GridLayout(15, 1));
// set buttons
controlPanel.add(bPrev = new Button("Previous"));
controlPanel.add(bNext = new Button("Next"));
controlPanel.add(n = new TextField(10));
controlPanel.add(bOK = new Button("OK"));
// set display fields

dataPanel = new Panel();
dataPanel.setLayout(null);
dataPanel.setSize(fontSize * 37, fontSize * 3 * 17);
// for 1st line: 0-f
Label zzz = new Label(" 0 1 2 3 4 5 6 7 8 9 a b c d e f");
dataPanel.add(zzz);
zzz.setSize(fontSize * 37, fontSize * 2);
zzz.setLocation(0, 0);
// for 2nd-17th line
someobjHolder = new Panel();
someobjHolder.setLayout(new GridLayout(1, 1));
dataPanel.add(someobjHolder);
someobjHolder.setSize(fontSize * 37, fontSize * 32);
someobjHolder.setLocation(0, fontSize * 2);
// set state
setObjects(0);
setFonts(0);
// create choice
controlPanel.add(cFont);
controlPanel.add(cStyle);
add(controlPanel);
add(dataPanel);
setview();
}

private void setObjects(int c) {
if(someobj != null) {
someobjHolder.remove((Component)someobj);
}
try {
someobj = (GraphicObjectMultiLine)(styleClass[c].newInstance());
} catch(Exception e) {
someobj = null;
}
someobjHolder.add((Component)someobj);
}

private void setFonts(int f) {
curfont = f;
((java.awt.Component)someobj).setFont(farray[f]);
}

private void setview() {
char charr[], charr2[];
String css;

charr = new char[4];
charr2 = new char[37];
charr2[0] = charr[0] = hexConst.charAt((higher>>4) & 15);
charr2[1] = charr[1] = hexConst.charAt((higher>>0) & 15);
charr[2] = '0';
charr2[3] = charr[3] = '0';
n.setText(new String(charr));
charr2[4] = ' ';
someobj.clearText();
for(int i = 0; i < 16; i++) {
charr2[2] = hexConst.charAt(i);
for(int j = 0; j < 16; j++) {
charr2[j * 2 + 5] = (char)((((int)higher)<<8) + i * 16 + j);
charr2[j * 2 + 6] = ' ';
}
someobj.appendTextWithNewline(new String(charr2));
}
}

public void finalize() {
dispose();
}

public boolean action(Event evt, Object arg) {
if(evt.target == bPrev) {
higher--;
setview();
return true;
} else if(evt.target == bNext) {
higher++;
setview();
return true;
} else if(evt.target == cFont) {
int x = curfont;
for(int i = 0; i < fontNames.length; i++) {
if(fontNames[i].equals(arg))
x = i;
}
setFonts(x);
return true;
} else if(evt.target == cStyle) {
int x = curstyle;
for(int i = 0; i < styleNames.length; i++) {
if(styleNames[i].equals(arg))
x = i;
}
setObjects(x);
setFonts(curfont);
setview();
pack();
show();
return true;
} else if(evt.target == n) {
int x;

try {
x = Integer.parseInt(n.getText(), 16);
} catch(Exception e) {
x = higher << 8;
}
higher = (byte)(x >> 8);
setview();
return true;
} else if(evt.target == bOK) {
hide();
dispose();
System.exit(1);
}
return false;
}

public static void main (String args[]) {
CharViewMultiLine test = new CharViewMultiLine();
test.pack();
test.show();
}
}

interface GraphicObjectMultiLine {
public void clearText();
public void appendTextWithNewline(String st);
}

class TestTextArea extends TextArea implements GraphicObjectMultiLine {
public TestTextArea() {
super(16,32);
}
public void clearText() { setText(""); }
public void appendTextWithNewline(String s) {
appendText(s + "\n");
}
}

class TestList extends List implements GraphicObjectMultiLine {
public TestList() {
super(16,true);
}
public void clearText() { clear(); }
public void appendTextWithNewline(String cx) { addItem(cx); }
}

class TestChoice extends Choice implements GraphicObjectMultiLine {
public TestChoice() {
super();
}
public void clearText() { /* NOWAY */ }
public void appendTextWithNewline(String cx) { addItem(cx); }
}